PRESSURE ACTUATED CATHETER SEAL AND METHOD FOR THE SAME
A catheter includes a pressure actuated seal within a manifold. A catheter body is coupled with the manifold, and a manifold lumen and catheter lumen are configured to receive pressurized fluids. The pressure actuated seal includes a pressure actuated seal element having a seal element lumen. The seal element lumen is in communication with the manifold and catheter lumens. The pressure actuated seal element is deformable between an open configuration and a sealed configuration. In the sealed configuration, the pressurized fluid in the manifold presses on the pressure actuated seal element along a first seal face. The pressure actuated seal element compresses inwardly around the seal element lumen according to the pressure of the pressurized fluid. In the open configuration, the pressure actuated seal element relaxes in the absence of the pressurized fluid, and the seal element lumen is open and configured to allow passage of an instrument.
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This present application is a continuation of U.S. patent application Ser. No. 13/032,185, filed on Feb. 22, 2011, now U.S. Pat. No. 8,951,229, which claims priority under 35 U.S.C. §119(e) to U.S. Patent Application No. 61/306,645, filed Feb. 22, 2010, the entire contents of which are incorporated herein by reference.
TECHNICAL FIELDCatheter and catheter lumen seals.
BACKGROUNDCatheter assemblies include lumens for the delivery of instruments and fluids to treatment areas within the body. It is sometimes necessary to seal the lumen to prevent the escape of fluids or provide a sealed environment isolated from exterior contaminants. In some examples, catheters include manually operated seal assemblies within catheter handles and manifolds. The manually operated seal assemblies are operated with mechanisms that turn nuts, close clamps, push pistons and the like to deform a seal element and close a lumen. Each of these mechanisms require a free hand or other device to seal the assembly. Further, the mechanisms require additional manual operation to disengage the seal and allow access to the lumen. Manually operated seals are particularly difficult to use during a procedure where the user's hands are dedicated to manipulating the catheter and other instruments. For instance, where the user needs to direct full attention to manipulation of a catheter including a manually operated seal the user must disengage or adjust the position of at least one hand to manipulate the seal and thereby may lose the previous orientation of a catheter already navigated or partly navigated through vasculature. Continued navigation or repositioning of the catheter may be required with possible frustration to the purpose of the procedure.
Additionally, the manual mechanisms fail to seal the lumen according to the pressure developed within the catheter assembly. Stated another way, the manually operated seal assemblies create a seal according to the mechanism used, for instance, according to the hand tightening of a nut without any assurance the seal will withstand a pressurized environment, such as fluids under pressure. These manual mechanisms may thereby be subject to complications including fluid leaks from the pressurized environment of the catheter or ingress of contaminants. Further, there is no clear indication to a user—other than an ambiguous resistance to further tightening—that a seal is formed. Without a clear indication of the status of a seal, undesirable leaking of fluids (including body fluids such as blood) and ingress of contaminants may occur without the knowledge of the user.
In the following detailed description, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration specific embodiments of the present disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice aspects of this disclosure, and it is to be understood that other embodiments may be utilized and that structural changes may be made without departing from the scope of the present disclosure. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims and their equivalents.
One example of a pressure actuated seal assembly is shown in
Referring again to
Referring now to
The amplifier 208 includes a first amplifier face 214 and a second amplifier face 216. As shown in
Referring now to
In operation, at least the manifold 102 receives a pressurized fluid within the manifold lumen 304 through the high pressure passage 108. The pressurized fluid is distributed into the manifold 102 toward the amplifier 208. The pressurized fluid engages with the amplifier 208 and forces the amplifier proximally toward the seal element 206. The biasing force provided by the biasing member 212 is overcome by the force of the pressurized fluid allowing the proximal movement of the amplifier 208. In one example, because of the O-ring 210 pressurized fluid is substantially prevented from moving around the amplifier 208 and into the remainder of the seal cavity 204. As the amplifier 208 is moved proximally toward the seal element 206 by the pressurized fluid the seal element 206 is deformed by the amplifier 208. Because the seal element 206 is held within a seal element cavity 310 (e.g., formed in the introducer guide 222 in one example) having a shape corresponding to the seal element deformation of the seal element 206 forces the seal element to constrict the seal element lumen 302 and tightly seal the seal element 206. Optionally, the fluid is pressurized gradually to slowly close the seal element 206. As the seal element 206 gradually closes some of the fluid including entrained air bubbles leaks through the seal element 206 out of the catheter lumen 306 and manifold lumen 304. Gradually applying pressure to the seal element 206 minimizes air bubbles within the system and correspondingly reduces the risk of emboli. Alternatively, the inner diameter of the seal element (e.g., the surface defining the seal element lumen 302) is sized to provide a residual seal around an instrument disposed therein when the fluid is not pressurized within catheter lumen 306. Optionally, the inner diameter of the seal element is sized to residually seal the seal element lumen 302 without pressurized fluid, and more tightly seal the lumen when pressurized fluid is present.
In another example, where one or more instruments are present within the seal element lumen 302 the seal element 206 constricts around the one or more instruments thereby closing the seal element lumen and preventing passage of the pressurized fluid beyond the seal element. In yet another example, where an instrument is not present within the seal element lumen 302, the seal element 206 is deformed by the amplifier 208 and compresses around the seal element lumen 302 to constrict and close the seal element lumen and substantially prevent passage of the pressurized fluids beyond the seal element. The seal element 206 is constructed with a pliable material including, but not limited to rubber, silicone, polyurethane, PEBAX (a registered trademark of the Ato Chimie Corp., France), synthetic latex, polyvinyl chloride, TEFLON (a registered trademark of E.I. DuPont de Nemours and Company, Corp. Delaware) and the like. The pliable material of the seal element is selected with a particular durometer to seal around one or more of an instrument, multiple instruments or close the seal element lumen without an instrument present. In another example, the amplifier 208 is constructed of a more rigid material than the seal 206 for instance, including, but not limited to, hard resins, such as polycarbonate, metals and the like.
The first amplifier face 214 has a first surface area and the second amplifier face 216 has a second surface area less than the first surface area of the first amplifier phase 214 (See
Once the pressurized fluid within the catheter 200 is removed or depressurized the amplifier 208 relaxes within the seal cavity 204 and moves distally toward the catheter body 104 allowing the seal element 206 to assume a relaxed orientation and open the constricted seal element lumen 302 for passage of instruments and the like through the seal element lumen. To assist the distal movement of the amplifier 208 away from the seal element 206 the biasing element 212 coupled between the amplifier 208 and manifold 102 pushes the amplifier 208 away from the seal element 206. Without the pressurized fluid engaged against the amplifier 208, the biasing element 212 overcomes any residual seating of the amplifier against the seal element 206 through friction, interference fitting and the like. Stated another way, the biasing element 212 urges the amplifier 208 away from the seal element 206 thereby allowing the seal element to relax. The relaxed seal element 206 opens the seal element lumen 302 permitting the free passage of instruments including guide wires and the like through the lumens of the catheter 200.
The pressure actuated seal assembly 202 including the seal element 206 automatically seals the seal element lumen 302 in the presence of a pressurized fluid without requiring hand operation from a catheter operator or separate actuation of different mechanism to effect a seal. Stated, another way, the operator does not operate the seal or observe an indicator separately from the operation of the catheter (e.g., for a thrombectomy procedure). Instead, the seal element lumen 302 is closed by the seal element 206 as the working environment within the catheter body and the manifold is pressurized for the medical procedure. By consolidating the sealing function with the operation of the catheter 100 during the procedure, the operator does not need to confirm a seal is present or remove a hand from the catheter 100 for operation of a seal mechanism to confidently know the pressure actuated seal assembly 202 is sealed and closing the seal element lumen 302. Operator error including failure to operate a separately operable seal and undesirable non-therapeutic movement of the catheter as the operator adjusts a hand grip on the catheter or fully removes a hand to operate a seal are substantially avoided.
Moreover, because the seal element 206 is actuated according to the fluid pressure within the catheter 100 the seal becomes correspondingly tighter with increasing fluid pressures. A seal is thereby maintained within the seal element lumen 302 across a range of pressures. For instance, the pressure actuated seal assemblies described herein provide a complete seal from at least 10 to 1200 psi. Optionally a complete seal is maintained with pressures greater than 1200 psi. Similarly, the pressure actuated seal elements automatically unseal in the absence of a pressurized fluid freeing the operator from manipulating a seal element into an open configuration.
As described above, the pressure actuated seal assembly 202 including the seal element 206 is configured to automatically seal the seal element lumen 302 when the working environment within the catheter and manifold is pressurized. Similarly, each of the seal elements and the corresponding pressure actuated seal assemblies described herein automatically seal according to pressure increases within the manifold lumen and catheter lumens.
Additionally, the seal element 206 is described above as configured to seal around an instrument or instruments positioned within the seal element lumen 302. Further, the seal element 206 is described as configured to constrict around an empty seal element lumen 302 and thereby seal the seal element 206. Each of the seal elements and corresponding pressure actuated seal assemblies described herein are similarly capable of at least one or both of sealing around one or more instruments and sealing an empty seal element lumen.
Referring again to
Referring again to
In operation, where the manifold lumen 304 receives a pressurized fluid, the fluid presses against the seal element flange and the amplifier 510 positioned adjacent to the seal element flange. The amplifier 510 is constructed of a rigid material, such as a plastic resin, and is pushed toward the seal element ring 504. Pressing of the amplifier 510 against the seal element ring 504 deflects the seal element ring. As the seal element ring 504 is deflected the pliable material of the seal element 502 is compressed toward the manifold proximal portion 122. Compression of the seal element at the seal element ring 504 forces the pliable material in the seal element ring to compress inwardly around the seal element lumen 512. Where an instrument is present within the seal element lumen 512 the seal element ring 504 engages around the instrument and provides a tight seal against the instrument. Where an instrument is absent from the seal element lumen 512 the seal element ring 504 presses inwardly around the seal element lumen 512 and closes the seal element lumen to provide a tight seal that substantially prevents the pressurized fluid in the manifold lumen 304 from moving proximally beyond the manifold proximal portion 122. Stated another way, as the pressure of the working environment within the manifold lumen 304 (and the catheter lumen 306) is increased for a medical procedure, the seal element 502 automatically constricts around the seal element lumen 512 to seal the lumen. Where one or more instruments are present within the seal element lumen 512, the seal element 502 automatically seals around the instruments.
In operation, where a pressurized fluid is provided within the catheter, such as the catheter 200 including the manifold lumen 304 and catheter lumen 306, the pressurized fluid engages against the amplifier 604. The rigid amplifier 604 is driven into the seal element 602 and pushes the seal element 602 into tight engagement with the tapered seal cavity surface 608. The tapered seal surface 606 is received along the tapered seal cavity surface 608. Compression of the seal element 602 by the amplifier 604 correspondingly compresses the seal element 602. The tapered seal cavity surface 608 biases the compressed seal element 602 along the tapered seal surface 606 to compress inwardly around the seal element lumen 610. Inward compression of the seal element 602 closes the seal element lumen 610 with the pliable material of the seal element 602. In a similar manner to the amplifier 208 shown in
In another example shown in
Referring again to
Referring to the assembled view shown in
In operation, where a pressurized fluid is present within the manifold lumen 710 the seal element 704 automatically closes the seal element lumen 714. The pressurized fluid engages against the diaphragm 708 including a first diaphragm surface 734. The second diaphragm surface 736, opposed to the first diaphragm surface 734, correspondingly engages against the amplifier 706. For instance, the second diaphragm surface 736 engages with the amplifier base 722 and pushes the amplifier 706 proximally toward the seal element 704 retained within the amplifier piston recess 730 along with the amplifier piston 726. Proximal movement of the amplifier piston 726 into engagement with the seal element 704 compresses the seal element 704 linearly within the amplifier ring recess 728. As shown in
In one example, the inner guide barrel 720 includes an inner barrel stop 732 sized and shaped to engage with the amplifier base 722 after the amplifier 706 is moved proximally within the seal cavity 702. The inner barrel stop 732 engages with the amplifier 706 to arrest additional proximal movement of the amplifier and prevent damage to the seal element 704 by over-compression of the seal element 704. Stated another way, the inner barrel stop 732 substantially prevents movement of the amplifier 706 past a specified position within the seal cavity 702 thereby preserving the structural integrity of the seal element 704 over the operational lifetime of the pressure actuated seal assembly 700.
When the pressurized fluid is no longer present within the manifold lumen 710 or is no longer pressurized the seal element 704 is free to relax and resume an undeformed state with the seal element lumen 714 open to freely pass fluids, instruments, guide wires and the like therethrough and provide access to the amplifier lumen 712, diaphragm lumen 738, manifold lumen 710, and the catheter lumen (e.g., catheter lumen 306 shown in
In the pressure actuated seal assembly 700 described above the seal element 704 and diaphragm 708 are constructed with, but not limited to, pliable materials capable of deflecting and compressing according to a pressurized fluid within at least the manifold lumen 710. The diaphragm 708 and seal element 704 include, for instance, pliable polymers including silicon, butyl rubber and the like. The amplifier 706, in at least one example, is constructed with a more rigid material, including but not limited to, resins such as polycarbonate, DELRIN plastic (a trademarked product of DuPont), polyvinyl chloride and the like.
In one example, the diaphragm 708 is retained within the seal cavity 702 between the introducer guide 716 and the inner surface of the seal cavity 702 within the manifold 102. For instance, as shown in
Referring now to
As previously described with respect to other seal elements, the seal element 1004 is constructed with a pliable material configured to axially compress under pressure and correspondingly inwardly compress around the seal element lumen 1014. As shown in
In operation, where a pressurized fluid is present within the manifold lumen 1012, the seal element 1004 is engaged by the fluid across the first seal face 1006 and compresses to automatically seal the seal element lumen 1014. As shown in
The pressurized fluid engages with the seal element 1004 along the first seal face 1006 and presses the seal element proximally toward the manifold proximal portion 122. Because of the proximal compression of the seal element 1004 the seal element deforms and compresses inwardly around the seal element lumen 1014 thereby closing the seal element lumen. In another example, where an instrument (or instruments), such as a guide wire, is positioned within the seal element lumen 1014 application of a pressurized fluid along the first seal face 1006 presses on the seal element 1004 and compresses the seal element 1004 around the seal element lumen 1014 to seal the seal element 1004 around the instrument therein. The large pliable seal element 1004 under the influence of a pressurized fluid is thereby able to close the seal element lumen 1014 with or without an instrument in the lumen. Optionally, the seal element 1004 closes around instruments and closes the lumen 1014 under high pressures or flow rates (e.g., 100 psi or greater). At lower pressures (e.g., 6 psi), the seal element lumen 1014 remains open to allow for purging of air from the manifold 102 and a catheter coupled with the manifold 102.
Referring again to the first seal face 1006 (shown in
The pressure actuated seal assembly 1000 closes the seal element lumen 1014 without an amplifier, such as a separate amplifier 208 shown in
Furthermore, in examples where the seal element is positioned around an instrument (e.g., a guide wire and the like) the gap between the seal element 1004 and the instrument in the seal element lumen 1014 is small. A fluid flow into the catheter will have a difficult time leaking through this gap and the pressure builds across the seal element 1004. Correspondingly, tighter gaps between the seal element and the instrument seal quickly and easily. Further the durometer of the seal 1004 is important. A readily deformable low durometer seal rapidly deforms under pressure and correspondingly quickly and tightly seals the seal element lumen 1014. Moreover, the surface area and volume of the seal affect the quality of the seal and the speed a seal is formed. Seals with relatively large surface areas and volumes relative to the seal element lumen 1014 deform quickly and easily. Similarly, a thick seal element 1004 with a long seal element lumen 1014 has a correspondingly long and difficult to pass gap between the instrument and the seal element. A longer gap path allows more pressure to build at the seal element 1004 and thereby deforms the seal element to close the seal element lumen 1014. Further still, greater flow rates (e.g., under pressure) build pressure more quickly and readily deform the seal element 1004 to create a tighter seal relative to seals created with lower flow rates. Infusate fluids with high viscosity also build pressure at the seal element 1004 because of the difficulty in moving viscous fluids through the seal element 1004 prior to deformation. Based on these specifications, the seal 1004 (or the seal examples described herein) are tailored via mechanical properties, dimensions, and tolerances to achieve a successful seal during periods of infusion.
Referring now to
In operation, where a pressurized fluid is present within the manifold lumen 1114 the pressurized fluid engages with the tapered seal face 1108 of the seal element 1106. The tapered seal face 1108 provides a larger surface area for the pressurized fluid to engage against thereby enhancing the force applied to the seal element 1106 and correspondingly enhancing the deflection of the seal element 1106 and its inward compression around the seal element lumen 1112. The pressurized fluid engaged along the tapered seal face 1108 presses the seal element 1106 proximally, and the seal cavity 1102 substantially prevents expansion of the seal element 1106 outwardly. Instead, proximal compression of the seal element 1106 forces the seal element 1106 to compress inwardly around the seal element lumen 1112 thereby closing the seal element lumen 1112 and providing a tight seal that substantially prevents the passage of the pressurized fluid past the seal element 1106. As in previous examples, where an instrument, such as a guide wire, is present within the seal element lumen 1112 application of the pressurized fluid along the tapered seal face 1108 compresses the seal element 1106 around the instrument within the seal element lumen thereby closing the seal element 1106 around the instrument and providing a tight seal that substantially prevents the passage of fluids beyond the seal element 1106.
The pressure actuated seal assembly 1200 includes a seal element 1204 positioned within a seal cavity 1202. As shown in
In operation, pressurized fluid within the manifold lumen 1214 applies a force across the distal tapered seal face 1206 and forces the seal element 1204 proximally within the seal cavity 1202. As described in the example shown in
Another example of a pressure actuated seal assembly 1300 is shown in
In operation, a pressurized fluid present within the manifold lumen 1314 enters the seal cavity 1302. The pressurized fluid at least partially surrounds the exterior of the deformable lip 1306 of the seal element 1304. The pressurized fluid compresses the deformable lip 1306 inwardly around the seal element lumen 1312. Compression of the deformable lip 1306 around the seal element lumen 1312 closes the seal element lumen to substantially prevent the passage of the pressurized fluid beyond the seal element 1304. In another example, where an instrument is present within the seal element lumen 1312 compression of the deformable lip 1406 around the instrument forces the deformable lip 1306 to tightly engage around the instrument and thereby create a seal that substantially prevents the passage of pressurized fluids between the instrument and the deformable lip 1306. The seal element 1304 including the deformable lip 1306 is constructed with a pliable material including, but not limited to, butyl rubber, silicone and the like. The deformable lip 1306 is constructed with the pliable material to ensure rapid deflection of the deformable lip and inward compression around the seal element lumen 1312 to provide a tight seal through the manifold 102. In another example, at least a portion of the deformable lip 1306 is coupled with another portion of the surfaces defining the seal cavity 1302. That is to say a distal portion of the deformable lip 1306 is coupled with a distal portion of the seal cavity 1302. In such an example, passages through the deformable lip 1306, for instance, from the seal element lumen 1312 to the exterior of the deformable lip 1306 allow the transmission of pressurized fluid out of the seal element lumen and into the area surrounding the deformable lip 1306. The deformable lip 1306 is thereby engaged by the pressurized fluid on the exterior surfaces of the seal element 1304 to deflect the deformable lip 1306 of the seal element to close the seal element lumen 1312.
Referring now to
In operation, where a pressurized fluid is present within the manifold lumen 1418 the pressurized fluid engages with the seal element 1404. The pressurized fluid engages against the exterior lip portion 1406 and deflects the lip portion outwardly to seal the exterior lip portion along the surfaces defining the seal cavity 1402 and substantially prevent passage of pressurized fluids around the seal element 1404. The pressurized fluid also engages with the interior lip portion 1408 and deflects the interior lip portion inwardly. Deformation of the interior lip portion 1408 inwardly assists in sealing the seal element lumen 1416 as the interior lip portion 1408 compresses around the seal element lumen 1416. The pressurized fluid further compresses the seal element 1404 proximally into the manifold 102 thereby forcing the tapered seal element surface 1412 into engagement with the tapered cavity surface 1410. The tapered seal element surface 1412 cooperates with the tapered cavity surface 1410 to exert an inward compressive force on the seal element 1404 toward the seal element lumen 1416. The pliable material in the seal element 1404 is pressed inwardly into the seal element lumen 1416 creating a tight seal and substantially preventing the passage of the pressurized fluid through the seal element 1404. Stated another way, the tapered seal element surface 1412 and tapered cavity surface 1410 cooperate and act as an amplifier to enhance the deformation of the seal element 1404 inwardly toward the seal element lumen 1416. Once the fluid is no longer pressurized, the seal element 1404 resumes a relaxed orientation because of its natural elasticity. In the relaxed orientation the seal element lumen 1416 is open and an instrument may pass through the seal element. The biasing projections 1414 shown in
In operation, where a pressurized fluid is present within the manifold lumen 1522 the pressurized fluid engages against the plunger 1504 and moves the plunger proximally toward the proximal seal cavity portion 1512. The pressurized fluid incident on the plunger face 1508 provides sufficient pressure against the plunger 1504 to overcome the biasing force of the biasing member 1516 allowing the plunger 1504 to move proximally within the seal cavity 1502. Movement of the plunger 1504 is transmitted to the seal element 1510. The pliable material of the seal element 1510 allows the seal element 1510 to deflect inwardly upon movement of the plunger 1504. As the plunger 1504 moves proximally the seal element 1510 deflects inwardly and closes the seal element lumen 1520. Where an instrument is present within the seal element lumen 1520 the deflecting pliable material of the seal element 1510 closes around the instrument within the seal element lumen and seals around the instrument preventing the passage of pressurized fluid through past the seal element 1510. Once the fluid within the manifold lumen 1522 and the seal cavity 1502 is no longer pressurized the plunger 1504 is moved distally toward the distal seal cavity portion 1514 by the biasing member 1516. As the plunger 1504 moves distally the seal element 1510 coupled between the plunger 1504 and the proximal seal cavity portion 1512 is pulled apart opening the seal element 1520. As the seal element 1510 is opened fluid may pass through the seal element lumen 1520. Similarly, an instrument may pass through the seal element lumen 1520 after the plunger 1504 is moved distally and the seal element 1510 relaxes to the orientation shown in
Optionally, with the pressure actuated seal assembly 1500 and any of the pressure actuated seal assemblies described herein, an introducer is fed through the seal element lumen 1520 prior to closure of the seal element 1510 by the pressurized fluid. The introducer includes a lumen capable of passing an instrument, such as a guide wire. Once the seal element 1510 is sealed around the introducer (e.g., because of pressurized fluid within the manifold lumen) the instrument is fed through the lumen of the introducer as desired by the operator. The introducer thereby facilitates feeding of the instrument through the catheter body while a pressurized fluid is present within the catheter body and the seal element 1510 is compressed inwardly into the seal element lumen 1520.
Referring now to
In one example shown in
A biasing member (e.g., a spring, elastomer and the like), is positioned between the proximal seal portion 1708 and the distal seal portion 1710. The biasing member 1732 biases at least the distal seal portion 1710 away from a proximal seal cavity surface 1736. The biasing member 1732 expands the seal element 1706 in a manner similar to an accordion and positions a pinching portion 1712 of the seal element 1706 outwardly from the seal element lumen 1716 to open the seal element lumen 1716 in the absence of pressurized fluid within the manifold 102. The seal element 1706 further includes, in another example, seal element hinges 1714. The seal element hinges 1714 permit deflection of the seal element 1706 (including the pinching portion 1712) inwardly into the seal element lumen 1716 during actuation by the plunger 1704.
The plunger 1704 shown in
In operation, when a pressurized fluid is present within the manifold lumen 1728 the pressurized fluid engages against the plunger 1704. For instance, at least a portion of the pressurized fluid is received within the plunger recess 1724. The plunger 1704 is moved proximally away from the distal seal cavity surface 1738 toward a proximal seal cavity surface 1736. Proximal movement of the plunger 1704 deflects the seal element 1706. Pressure applied to the seal element 1706 through the plunger 1704 overcomes the bias provided by the bias member 1732 to the seal element 1706. The distal seal portion 1710 of the seal element 1706 is deflected proximally toward the proximal seal cavity surface 1736. The seal element 1706 acts as a linkage around the seal element hinges 1714 as the distal seal portion 1710 is moved proximally. The pinching portion 1712 compresses around the seal element lumen 1716 and the opposed surfaces of the pinching portion 1712 engage to seal the seal element lumen 1716 and prevent the passage of pressurized fluids through the seal element lumen 1716 and out of the manifold 102. In a similar manner, where an instrument, such as a guide wire, is present within the seal element lumen 1716 pressure upon the plunger 1704 correspondingly deflects the seal element 1706 and moves the pinching portions 1712 inwardly to engage around the instrument. The pinching portions 1712 engage around the instrument and create a seal preventing the passage of pressurized fluids around the instrument and through the seal element lumen. After the pressure is released on the within the manifold lumen 1728 the bias of the biasing member 1732 is no longer opposed by a pressure within the seal cavity 1702. The biasing member 1732 presses the distal seal portion 1710 distally toward the distal seal cavity surface 1738. The plunger 1704 is correspondingly moved toward the distal seal cavity surface 1738 with distal movement of the distal seal portion 1710. The pinching portion 1712 of the seal element 1706 moves outwardly as the biasing member distally moves the distal seal portion 1710 thereby opening the seal element lumen 1716 and allowing passage of the fluids and instruments.
Referring now to
A guide wire 1800 is shown positioned within the catheter lumen 306 and extending through the guide wire orifice 1802. Positioning of a portion of the guide wire, for instance the guide wire tip 1807, within the guide wire orifice 1802 partially closes the interior of the catheter and assists in maintaining the pressurized environment within the catheter lumen 306 created in part through operation of the pressure actuated seal assembly within the manifold 102. The guide wire orifice 1802 includes a perimeter substantially matching the perimeter of the guide wire tip 1807 with sufficient tolerance to allow movement of the guide wire tip through the orifice. Positioning the guide wire tip 1807 within the guide wire orifice 1802 closely fits the catheter distal portion 114 around the guide wire tip 1807 and minimizes fluid flow through the guide wire orifice 1802 from the catheter lumen tapered portion 1808 to the environment surrounding the catheter 100.
In one example, the catheter distal portion 114 includes pressurized fluid passages 1804 provided in at least one of the catheter lumen tapered portion 1808 and the portion of the catheter body including the catheter lumen intermediate portion 1810. Referring to
The pressurized environment within the catheter lumen 306 provides a substantially similar pressure at the catheter distal portion 114 compared to the catheter proximal portion 112 in close proximity to the pressure actuated seal assemblies. The catheter body 104 maintains this pressurized environment throughout the catheter body 104 without substantial pressure losses from the catheter proximal portion 112 to the catheter distal portion 114 because the catheter body 104 is spaced away from the interior of the catheter lumen 306. For instance, as shown in
Another example of a fluid jet system 1812 is shown in
In operation, the fluid jet system 1812 is positioned on the catheter body distal portion 114 and positioned at a desired location within the vasculature. For example, the catheter body 104 (see
Where the guide wire orifice 1802 has a tight tolerance with the guide wire tip 1807 the specialist withdraws the guide wire tip from the orifice and the fluid is delivered through the guide wire orifice. In the option having space between the guide wire tip 1807 and the surfaces of the guide wire orifice 1802 (e.g., where the catheter includes one or more of the catheter lumen tapered portion 1808 and a gap between the guide wire tip and the orifice) pressurized fluid is delivered through the space. The specialist may adjust the delivery pressure and flow rate as needed according to axial positioning of the guide wire tip 1807 relative to the guide wire orifice 1802. For instance, fluids are delivered with higher pressure and greater velocity (with a correspondingly strong jet) where a small space is formed between the guide wire tip 1807 and the guide wire orifice 1802 surface. Greater flow rate is achieved where the guide wire tip 1807 is withdrawn, at least partially or more, from the guide wire orifice 1802 surfaces thereby increasing the gap between the catheter and the guide wire tip. As described above with regard to the fluid jet distributor 1801, the fluid jet system 1812 delivers fluids over a range of pressures including, but not limited to, pressures sufficient to deliver the fluids through the guide wire orifice 1802 to the vessel location, and higher pressures for delivery of the fluid and removal of thrombus.
Another example of a catheter 1814 is shown in
Referring now to
Several options for the method 1900 follow. In one example, pressing the seal element 206 includes pressing an amplifier, such as the amplifier 208, against the seal element 206. The amplifier 208 multiplies the force of the pressurized fluid transmitted to the seal element 206. For instance, the amplifier includes a first amplifier face 214 substantially larger than the second amplifier face 216. The first amplifier face 214 is directed toward the pressurized fluid and the second amplifier face 216 is directed toward the seal element 206. Force applied to the first amplifier face 214 by the pressurized fluid is transmitted through the amplifier 208 to the second amplifier face adjacent to the seal element 206 and smaller than the first amplifier face. The force transmitted through the amplifier 208 from the large first amplifier face is multiplied at the smaller second amplifier face 216 and is transmitted into the seal element 206. In another example, deforming and constricting the seal element, such as the seal element 1304 having at least one deformable lip 1306, includes constricting the deformable lip 1306 around the seal element lumen 1312.
In still another example, the method 1900 includes distributing a fluid including, but not limited to, medication, contrast, saline and the like through the catheter distal portion 114, for instance through pressurized fluid passages 1804 (see 18A). Optionally, a fluid is distributed through a guide wire orifice 1802 as shown in
Referring again to
As described above, the seal element 2004 includes a plurality of portions including, for instance first, second and third seal portions 2006A, B, C. In one example, the first, second and third seal portions 2006A-C are constructed with varying materials with correspondingly different durometers. For instance, each of the first, second and third seal portions are constructed with pliable materials configured to deflect as pressure is applied across, for instance, a first seal face 2008 of the first seal portion 2006A through the slit 1032 between the distal end of the seal cavity 2024 and the first seal face 2008. For instance, as pressure is applied across the first seal face 2008 the first seal portion 2006A is pressed toward the second and third seal portions 2006B, C and compresses each of the seal portions through engagement of intermediate seal faces 2012 and thereby inwardly compresses the first, second and third seal portions 2006A-C around the seal element lumen 2016. Optionally, compression of the first, second and third seal portions 2006A-C similarly expands the seal portions outwardly and engages the seal element perimeter 2018 with the seal cavity perimeter 2020 to substantially prevent the flow of pressurized fluid around gaps otherwise formed between the first through third seal portions 2006A-C and the seal element perimeter 2018.
As described above the first, second and third seal portions 2006A-C are each constructed with different materials having different durometers. In one example, the first seal portion 2006A is constructed with a first material having a first durometer while the second and third seal portions 2006B, C include materials having second and third respective materials each with different durometers. Optionally, the first and second seal portions 2006A, B include materials having a durometer greater than the durometer of the intermediate third seal portion 2006C. The first and second seal portions 2006A, B thereby form a seal chamber 2014 that substantially contains the third seal portion 2006C therebetween. In one example, the seal chamber 2014 including the first and second seal portions 2006A, B maintains the third seal portion 2006C in the configuration shown in
In another example, the first seal portion 2006A is constructed with a material with a greater durometer than that of the third seal portion 2006C and the first seal portion 2006A acts as an amplifier when engaged with pressurized fluid, for instance, along the first seal face 2008. The first seal portion 2006A is pressed into engagement with the third seal portion 2006C and compresses the more pliable third seal portion 2006C to collapse the seal portion 2006C around the seal element lumen 2016. Optionally, each of the first, second and third seal portion 2006A-C compresses inwardly (and outwardly in some examples) under differing pressures. For instance, at lower pressures such as less than 50 psi the intermediate third seal portion 2006C having a lower durometer initially expands inwardly to close the seal element lumen 2016 for instance around an instrument positioned within the seal element lumen. At a higher pressure, for instance, 50 to 1200 psi the third seal portion 2006C as well as one of the first and second seal portions 2006A, B (based on the durometers of each of the seal portions) compresses with the third seal portion 2006C to compress the seal materials around the seal element lumen 2016 including, for instance, an instrument disposed therein. At even higher pressures, such as at 1200 to 1500 psi each of the first, second and third seal portions 2006A-C is compressed by the pressurized fluid applied along the first seal face 2008, for instance, through transmission of compression through intermediate seal faces 2012 engaged between the seal portions. Each of the seals compresses inwardly around the seal element lumen 2016 to close the seal element lumen 2016 or engage the seal portions around an instrument provided within the seal element lumen 2016. Optionally, the seal portions 2006A-C are configured to only provide a seal when an instrument is disposed within the seal element lumen 2016 and otherwise allow throttled flow of fluid (e.g., for purging of a catheter system) through the lumen.
In other examples, the materials of the first, second and third seal portions 2006A-C are selected with a variety of durometers to tune the response of the seal element 2004 to seal with one or more of the seal portions 2006A-C under varying pressures. One such example is provided immediately above. In one prophetic example, the first seal portion 2006A includes a first material having a durometer of approximately 60, the second seal portion includes a durometer of approximately 30 and the third seal portion 2006C includes a more pliable durometer of approximately 10.
The pressure actuated seal assemblies and methods for using the same described herein automatically seal a seal element lumen in the presence of a pressurized fluid without requiring hand operation from a catheter operator. The operator does not need to operate the seal or observe an indicator to know the pressure actuated seal assembly is sealed and closing the seal element lumen. Instead, when a pressurized fluid is introduced to the catheter and manifold for use as part of a procedure the seal assembly automatically closes because of the pressure. The operator can thereby confidently operate the catheter without doubting whether the seal has closed the seal element lumen or the seal was not actuated because of operator error. Additionally, because the seal element is actuated according to the fluid pressure within the catheter the seal becomes correspondingly tighter with increasing fluid pressures. A seal is thereby maintained within the seal element lumen across a range of pressures. For instance, the pressure actuated seal assemblies described herein provide a complete seal from at least 10 to 1200 psi. Optionally a complete seal is maintained over pressures greater than 1200 psi. Similarly, the pressure actuated seal elements automatically unseal in the absence of a pressurized fluid freeing the operator from manipulating seal element into an open configuration.
Further, the seal element is capable of closing the seal element lumen with or without an instrument therein. The seal element seals around a variety of instrument sizes and configurations (guidewires with varying diameters, multiple instruments and the like). For instance, a single seal element will seal around a variety of instruments with different perimeters when under pressure from fluid in the catheter body. In another example, the seal element material and seal element lumen size are chosen according to the size of the instrument delivered through the seal element. Stated another way, the seal element is chosen to ensure tight sealing around a specified instrument when the seal element is subjected to pressure from the pressurized fluid in the catheter body.
If a procedure requires the presence of an instrument within the catheter while the pressurized environment is maintained the instrument is fed into the catheter through the seal element. As the pressurized fluid applies pressure to the seal element the seal element closes and seals around the instrument. Optionally, sealing of the seal element fixes the instrument in place and correspondingly retains the instrument in a desired orientation according to the needs of the operator. In another example, the instrument is slidable through the closed seal element if movement of the instrument is necessary while the fluid is pressurized in the catheter. In any case, when the fluid in the catheter body is no longer pressurized and the seal element is open and the instrument is easily slidable through the seal element lumen.
Moreover, the seal elements and the surrounding manifolds are configured to permit back loading and front loading of instruments (e.g., feeding the instrument into the catheter from the manifold and feeding the instrument toward the manifold from the catheter, respectively). For instance, one or more of the manifold and the seal element include tapering surfaces that guide the instrument through the seal element lumen when front or back loaded.
In one example, the instrument includes an introducer having its own lumen and a second instrument is fed through the introducer into the pressurized environment of the catheter. Sealing the seal element around the introducer thereby provides access through the catheter to vasculature while pressure is maintained within the catheter. Optionally, the instrument within the introducer is snuggly engaged by the interior surface of the introducer and slidable relative to the introducer. The instrument and introducer are sized and shaped to minimize the space therebetween to substantially prevent the passage of pressurized fluids through the introducer while still allowing movement of the instrument through the seal.
As previously described, the pressure actuated seal assemblies maintain a pressurized environment within the catheter lumen during operation of the catheter, for instance, during a thrombectomy procedure where high pressure fluids are fed through the catheter body. Pressurized fluid is transmitted through the catheter lumen to the catheter distal portion. The catheter lumen tapers into a fluid jet manifold and the pressurized fluid is directed through pressurized fluid passages into fluid jets that project from the catheter body. Because the catheter interior wall only tapers near the catheter distal portion pressure losses are minimized between the catheter proximal and distal portions. The catheter lumen tapers near the catheter distal portion to enhance the strength of the fluid jets projecting from the pressurized fluid passages. Similarly, where an instrument is present within the catheter lumen (e.g., a guide wire) the catheter interior wall is spaced from the instrument to minimize pressure losses between the wall and the instrument. Stated another way, flow characteristics including turbulent flow extending between the catheter interior wall and the instrument are avoided. The pressure within the catheter lumen is thereby substantially maintained from the catheter proximal portion to the catheter distal portion.
Although the present disclosure has been described in reference to preferred embodiments and methods for use of those embodiments, persons skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the present disclosure. It is to be understood that the above description is intended to be illustrative, and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reading and understanding the above description. It should be noted that embodiments discussed in different portions of the description or referred to in different drawings can be combined to form additional embodiments of the present application. Further, the elements and features of one or more of the pressure actuated seal elements and the associated structures and functions of the seal elements is fully compatible with other fluid delivery devices including, but not limited to, handheld manifolds, access ports and independent catheters. Stated another way, the pressure actuated seal elements are not limited to direct or integral coupling or incorporation to a catheter. The scope of the present disclosure should, therefore, be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.
Claims
1. A pressure actuated seal assembly comprising:
- a manifold including a seal cavity and a manifold lumen extending through the manifold and the seal cavity;
- a pressure actuated seal element positioned within the seal cavity, the seal element includes: a first seal face in communication with the manifold lumen, a second seal face opposed to the first seal face, and a seal element lumen extending from the first seal face to the second seal face, wherein the seal element lumen is in fluid communication with the manifold lumen, wherein at least the first seal face tapers from an intermediate seal portion toward a distal seal portion, and the first seal face has a greater area than a cross-section of the seal cavity; wherein the pressure actuated seal element is deformable between an open configuration and a sealed configuration, wherein: in the sealed configuration, pressurized fluid in at least the manifold lumen presses on the pressure actuated seal element along the first seal face, and the pressure actuated seal element compresses inwardly around the seal element lumen, and in the open configuration, the pressure actuated seal element relaxes in an absence of the pressurized fluid, and the seal element lumen is open and configured to allow passage of an instrument therethrough.
2. The pressure actuated seal assembly of claim 1, wherein the second seal face tapers from an intermediate seal portion toward a proximal seal portion, and the seal cavity tapers from near the intermediate seal portion toward the proximal seal portion, and the tapered seal cavity is sized and shaped to receive the tapered pressure actuated seal element.
3. The pressure actuated seal assembly of claim 2, wherein the first and second seal faces are tapered at different angles relative to the seal element lumen.
4. The pressure actuated seal assembly of claim 2, wherein the second seal face has a greater area than the first seal face.
5. The pressure actuated seal assembly of claim 1, wherein the pressure actuated seal element includes a first seal portion including the first seal face, a second seal portion including the second seal face and a third seal portion intermediate to the first and second seal portions, and one or more of the first, second and third seal portions has a hardness different from another of the seal portions.
6. A catheter assembly comprising:
- a self-sealing manifold including a seal cavity and a manifold lumen extending through the manifold and the seal cavity;
- a tapered catheter body coupled with the self-sealing manifold, the tapered catheter body includes a taper over at least a portion of a catheter body length including a catheter distal portion, the tapered catheter body includes a catheter lumen in communication with the manifold lumen, wherein the manifold lumen and the catheter lumen are configured to receive pressurized fluids; and
- the self-sealing manifold includes a seal assembly positioned within the seal cavity, the seal assembly sealing the manifold lumen and the catheter lumen near the self-sealing manifold in a presence of the pressurized fluids within at least one of the manifold lumen and the catheter lumen, wherein the seal assembly includes: a seal element within the seal cavity, the seal element including first and second seal faces, wherein at least the first seal face tapers from an intermediate seal portion toward a distal seal portion, and the first seal face has a greater area than a cross-section of the seal cavity, and the second seal face is coupled to the first seal face.
7. The catheter assembly of claim 6, wherein the second seal face tapers from an intermediate seal portion toward a proximal seal portion, and the seal cavity tapers from near the intermediate seal portion toward the proximal seal portion, and the tapered seal cavity is sized and shaped to receive the tapered pressure actuated seal element.
8. The seal assembly of claim 7, wherein the first and second seal faces are tapered at different angles relative to the manifold lumen.
9. The seal assembly of claim 7, wherein the second seal face has a greater area than the first seal face.
10. The catheter assembly of claim 6, wherein the catheter distal portion includes one or more fluid passages, and a fluid is distributed from the one or more fluid passages when the pressurized fluids are received within the manifold and catheter lumens and the seal assembly seals the manifold lumen and the catheter lumen near the self-sealing manifold.
11. The catheter assembly of claim 10, wherein the one or more fluid passages include a plurality of fluid passages extending through a catheter sidewall.
12. A catheter assembly comprising:
- a manifold, the manifold includes a manifold lumen having a manifold lumen perimeter, the manifold lumen extends through the manifold;
- wherein the manifold includes an elongate seal cavity in communication with the manifold lumen, the elongate seal cavity extends longitudinally from a seal cavity proximal end to a seal cavity distal end, a seal cavity perimeter circumscribes the elongate seal cavity, and the seal cavity perimeter is larger than the manifold lumen perimeter;
- a pressure actuated seal element within the elongate seal cavity, the seal element includes: a first seal face, a second seal face opposed to the first seal face, and a seal element lumen extending from the first seal face to the second seal face, the seal element lumen is in communication with the manifold lumen;
- wherein at least the first seal face tapers from an intermediate seal portion toward a distal seal portion, and the first seal face has a greater surface area than a cross-section of the seal cavity.
13. The catheter assembly of claim 12, wherein the second seal face tapers from an intermediate seal portion toward a proximal seal portion, and the seal cavity tapers from near the intermediate seal portion toward the proximal seal portion, and the tapered seal cavity is sized and shaped to receive the tapered pressure actuated seal element.
14. The catheter assembly of claim 13, wherein the first and second seal faces are tapered at different angles relative to the seal element lumen.
15. The catheter assembly of claim 13, wherein the second seal face has a greater area than the first seal face.
16. The catheter assembly of claim 12, wherein the pressure actuated seal element is configured to deform when an instrument is positioned within the seal element lumen and the pressurized fluid is within the manifold lumen, the seal element compresses inwardly and seals around the instrument.
17. The catheter assembly of claim 12, wherein compressing the first seal face toward the second seal face compresses the pressure actuated seal element outwardly into sealing engagement with the seal cavity perimeter.
18. The catheter assembly of claim 12, wherein the pressure actuated seal element includes a first seal portion including the first seal face, a second seal portion including the second seal face and a third seal portion intermediate to the first and second seal portions, and one or more of the first, second and third seal portions has a hardness different from another of the seal portions.
19. The catheter assembly of claim 18, wherein the first seal portion includes a first portion hardness greater than a second portion hardness of the second seal portion, and the first portion hardness is greater than a third portion hardness of the first seal portion.
20. The catheter assembly of claim 19, wherein the second portion hardness is greater than the third portion hardness.
Type: Application
Filed: Feb 10, 2015
Publication Date: Jun 4, 2015
Applicant: BOSTON SCIENTIFIC LIMITED (Hamilton HM11)
Inventors: MICHAEL J. BONNETTE (MINNEAPOLIS, MN), ERIC J. THOR (ARDEN HILLS, MN), STEPHEN E. WEISEL (BROOK PARK, MN), ARTHUR E. UBER, III (PITTSBURGH, PA), LEIF E. LEIRFALLOM (PLYMOUTH, MN), LASZLO T. FARAGO (HUDSON, WI)
Application Number: 14/618,448