DISPOSABLE SHEATH FOR A MINIATURE ENDOSCOPE
An endoscopic has an fiber optic waveguide that transmits an image from a distal end to a proximal end, the waveguide having an outer diameter of less than 3 mm. A lens system is positioned at the distal end of the fiber optic waveguide. An imaging device is optically coupled to the proximal end of fiber optic waveguide. A disposable sheath extends about the fiber optic waveguide to provide a sterile barrier, and in a preferred embodiment the sheath includes an illumination channel. In a preferred embodiment, the lens system has a first lens element, a second lens element and an aperture stop.
The present application is a continuation of U.S. patent application Ser. No. 11/072,685 filed on Mar. 4, 2005, now U.S. Pat. No. 7,942,814, which is a continuation of U.S. application Ser. No. 10/042,126 filed Oct. 19, 2001, now U.S. Pat. No. 6,863,651. The entire contents of the above applications are incorporated herein by reference in their entirety.
BACKGROUND OF THE INVENTIONEndoscopes enable visual examination of structure inside cavities. In the field of medicine, the use of endoscopes permits inspection of organs for the purposes of diagnosis, viewing of a surgical site, sampling tissue, or facilitating the safe manipulation of other surgical instruments.
Laparoscopes, for example, are used particularly for examining organs in the abdominal area. Laparoscopes typically include a light pipe for illuminating the region to be viewed, at least one lens assembly for focusing and relaying the image of the illuminated object, and a housing for the entire assembly which is structured to minimize tissue damage during the surgical procedure. The light pipe can include a fiber optic element for illuminating the site. The laparoscope housing includes a distal section that can be inserted within a body cavity and a proximal section which can include a handle that a user grips to position the distal end near the surgical site.
Existing endoscopes can include an imaging device such as a charged coupled device (CCD). This device can capture an image of an object being viewed and convey it to a display device, such as a monitor. There is a continuing need to improve on the operational features and manufacturability of endoscope systems that improve imaging capability and reduce the risk to the patient.
SUMMARY OF THE INVENTIONThe present invention relates to a small diameter imaging probe or endoscope having improved durability, resolution, and field of view. In a preferred embodiment of the invention, the distal end of the probe including a disposable sheath, can be inserted into the tissue under examination. The probe is less than 3 millimeters in diameter, and preferably less than 2 millimeters in diameter, to reduce trauma at the point of insertion and thereby provide access to sites that are otherwise unavailable for endoscopic procedures.
In a preferred embodiment, the endoscope has a fiber optic waveguide that transmits an image from a distal end to a proximal end. A lens system is positioned at the distal end of the fiber optic waveguide. An imaging device is optically coupled to the proximal end of fiber optic waveguide. A sheath extends about the fiber optic waveguide, the sheath including illumination fibers. Although a preferred embodiment utilizes a probe and sheath assembly having an outer diameter of 2 mm or less, certain applications will accommodate a larger diameter instrument having a larger number of imaging fibers to provide a higher resolution image. These applications can utilize outer diameters in a range of 2-4 mm.
In one embodiment, the lens system having a first lens element, a second lens element and an aperture stop. The lens system couples light from any given position on the object to a plurality of optical fibers such that the numerical aperture of light varies as a function of the angle relative to the longitudinal axis of the lens system. This provides more efficient coupling to the fiber apertures. This is accomplished using a non-telecentric lens system.
A preferred embodiment of the lens system includes a pair of lenses and an aperture stop. The lenses are shaped to improve light collection around the periphery of the distal lens. This provides a clearer image across the entire field of view of the device. The aperture stop is positioned to provide efficient coupling to the array of fibers.
The imaging device can be a charged coupled device (CCD), a CMOS imaging device or other solid state imaging sensor having a two dimensional array of pixel elements. The imaging sensor is mounted on a circuit board in a handle assembly. The sensor can capture an image as an object being viewed and an image processing circuit mounted onto the circuit board transfers the image data over a video cable to a computer for storage, processing and/or display.
The miniature endoscope system can be used for orthopedic, rhematologic, general laparoscopic, gynecological or ear, nose and throat procedures, for example. Although many applications require a small diameter to reduce trauma, certain applications can accommodate larger diameters. The probe can include an open channel in either the sheath or the imaging probe to provide for the insertion of other operative elements to flush the site with fluid, direct light or other energy source onto a treatment site, or to remove a tissue sample.
The sheath assembly can include a concentric array of illumination fibers extending to a connector on a sheath hub assembly. Alternatively, the illumination fibers can couple to a fiber connector in the probe assembly that is coupled directly via fiber optic cable extending from the handle to a light source housing. The housing can include a video disk recorder that writes the video onto disk. For certain applications, an illumination bundle can be positioned within the probe such that the sheath is thinner or can accommodate a larger working channel.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
An embodiment of the invention is illustrated in
The handle 32 can house a power input 41, used to provide power to the endoscope 20. It is recognized that the light source 40 and/or power source can be mounted within the handle 32.
The handle 32 can also house an image output 42. The image output 42 provides a connection between an imaging device in the imaging unit 22 of the endoscope 20 and an electronic storage and/or display device. In one embodiment, the storage device is a computer 44, which is connected to a monitor 46. A control unit 250 is described in greater detail with respect to
As explained below in greater detail the imaging unit 22 does not need to be sterilized in that the imaging unit 22 does not contact or is in direct exposure to the body. The sheath/illuminator unit 24 has the disposable sheath 34 that is a sleeve assembly 52 that is carried by the base 35 secured to the imaging unit 22 that overlies the elongated tube 28 to create a sterilized barrier. In addition, the sheath/illumination unit 24 has a sterilized drape 52 which is mounted to the base 35 of the sheath/illuminator unit 24 and is positioned to overlie the remaining portion of the imaging unit 22 to provide a sterile environment.
Endoscopes and endoscopes with disposable sheaths are described in PCT Application PCT/US00/25107 filed on Sep. 13, 2000 and U.S. patent application Ser. No. 09/518,954 filed on Mar. 6, 2000. The entire contents of the above applications are incorporated herein by reference in their entirety.
Prior to discussing the endoscope 20 in further detail, in order to use the endoscope 20, the endoscope 20 needs to be positioned in the body to view the desired location. One such method is to insert a cannula 60 into the body and thread the endoscope 20 through the cannula 60. One method of inserting the cannula 60 into the body and then inserting the endoscope 20 into a body using the cannula 60 is described below.
During an insertion procedure, a cannula 60 such as seen in
For insertion of the cannula 60 into the body, a trocar 76, as seen in
While the cannula 60 and trocar 76 are of a relative minimal cost and can be reused after sterilization or disposed of after use, because of several components in the endoscope 20 such as components in the imaging unit 22, it is not desirous to dispose of the entire endoscope 20. The endoscope 20 uses a disposable sleeve or sheath 34 to aid in maintaining a sterile environment and reduce or eliminate the sterilization requirements prior to reuse.
With the method of inserting the endoscope 20 into the cannula 60 to have the distal end of the endoscope 20 at the proper location, previously described, the endoscope 20 is described in further detail. Referring to
As seen in
The disposable sheath/illuminator unit 24 has the drape 52 which surrounds the handle of the imaging unit 22. In addition, the sheath/illuminator unit 24 has the illumination pigtail connecting to a light source 40 as seen in
Referring to
In a preferred embodiment, the outer sheath 98 of the disposable sheath 34 of the sheath/illuminator unit 24 is made of a stainless steel material and has an outer diameter of about 0.038 inches. The inner tube 100 is likewise made of a stainless steel material. The illumination fibers 108 are made of a glass or plastic fiber. Depending on the size of the device, the maximum number of illumination fibers 108 are used to fill channel 106. In one example, the disposable sheath 34 extends 2.246 inches from the base 35 of the sheath/illuminator unit 24.
Interposed between the outer sheath 98 and the inner tube is the plurality of illumination fibers 108 which encircle the inner tube 100 as best seen in
The illumination pigtail 88 has a connection 38 for connecting to a connector on the light source 40. The illumination pigtail 88 has a plurality of optical fibers which run from the connection 38 to the fibers 108 which transmit the light received from the light source 40 to the transmission unit 118 shown in
Referring to
The imaging unit 22 enlarges the image from the end of the fiber optic 26 and couples it to the charged coupled device 30B. As indicated above, the charged coupled device is connected to a electronic storage and/or display device such as a computer 44 which is connected to a monitor 46 as seen in
The handle 32 of the imaging unit 22 has a mounting mechanism 128 for coupling with the mounting mechanisms 36 of the sheath illuminator unit 24. The mounting mechanism 128 has slots 130 for receiving pins located on the mounting mechanisms 36. In addition, the mounting mechanism 128 has a projection 134, from which the probe 29 projects, that is received by the receiving chamber 114 of the sheath/illuminator unit 24 as seen in
An enlarged view of the distal end of the imaging unit 22 is shown in
Referring to
In addition, the fibers are in a disorder pack method. This disorder pack method limits transmission of images/light from one lens 142 to another as the image fiber bundle 26 extends from near the distal end 126 of the imaging unit 22 towards the proximal end of the fibers located within the handle 32. The disorder packing of fibers is achieved by varying the doping of the fibers, which is the area to be examined.
Referring to
The distal lens system 142 as shown in
The ray tracings 160 in
Referring to
In one embodiment, the endoscope 20 has 10,000 fiber elements. In this embodiment, each fiber element 146 has a diameter of 4.4 microns. The overall diameter of the fiber 26 is 0.46 mm. The elongated or outer tube 28 of the imaging unit is made from stainless steel. It is recognized, that the scope can be formed in many sizes, the following table is merely an illustration of various intervening size scopes.
As can be seen from table above, an alternative to an acromat lens described above with respect to
The grin lens 168 in general does not provide as good of image quality as that of the acromat lens system 142 described above in that the image becomes less clear (i.e., blurry and distorted) towards the edge of the image. In addition, the color correction, changes in intensity as a function of wavelength, is not as good as in the acromat lens system. However, the GRIN lens system 168 may be desirable in situations where cost is a higher factor than the overall image quality. In addition, because of the grin lens 170 being a single element lens the depth of fields may be limited. While only 2 different degrees of freedom are shown, it is recognized that lens systems with other fields of view can be made.
In addition in the embodiment of the endoscope 170 shown in
The lower half of
While
Referring to
Referring to
In that the sheath is not required to carry illumination to the distal end of the rod tip 218 in the embodiment shown in
Referring to
The endoscope is used as shown generally in the process sequence 270 of
After medicating the site, the cannula with the trocar is inserted into the body by a standard technique of probing with the physician's hand. Once the cannula is in position, the trocar is removed 274 and the tip of the endoscope is placed into the cannula. The endoscope is secured to the cannula using a screw or other attachment mechanism. The system is actuated 276 and video recording is initiated so that the physician is able to move the cannula in and out and around to position the probe for viewing of the desired site or a monitor. The physician can perform a procedure 278 at the site using other instruments such as a laser scalpel or cautery tool, or electrosurgical tool and/or the operative channel in the probe or sheath assembly. The entire examination or operative procedure can be recorded 280 on a video disk or other memory device. The procedure is concluded and the sheath assembly can be disposed 282 of and another sterile sheath assembly can be attached 284 to the probe for another procedure.
The claims should not be read as limited to the described order or elements unless stated to that effect. Therefore, all embodiments that come within the scope and spirit of the following claims and equivalents thereto are claimed as the invention.
Claims
1. A disposable fiber optic sheath for illuminating a region within a body comprising:
- a tubular sheath having an inner tube and an outer tube with a diameter of less than 2 mm and a concentric array of illumination optical fibers within the sheath;
- a seal at the distal end of the sheath that transmits an image; and
- a connector assembly at a proximal end of the sheath.
2. The fiber optic sheath of claim 1 wherein the connector assembly further comprises a hub assembly including an optical coupler connected to a proximal end of the optical fibers.
3. The fiber optic sheath of claim 2 wherein the optical coupler comprises a light interface within the hub assembly.
4. The fiber optic sheath of claim 1 further comprising a sterile barrier attached to a base.
5. The fiber optic sheath of claim 4 wherein the sterile barrier comprises a drape adapted to extend over an endoscope handle.
6. The fiber optic sheath of claim 1 wherein the seal comprises a window.
7. The fiber optic sheath of claim 1 wherein an annular channel extends between the outer tube and the inner tube.
8. The fiber optic sheath of claim 7 wherein the optical fibers fill the annular channel.
9. The fiber optic sheath of claim 1 wherein the inner tube defines an airspace to receive an elongated tube of an endoscope imaging unit.
10. The fiber optic sheath of claim 1 wherein the optical fibers at a distal end of the sheath are not protected and exposed to the body.
11. The fiber optic sheath of claim 1 further comprising a fluid delivery channel for delivering medication to a region of interest in a body lumen or cavity.
12. The fiber optic sheath of claim 1 further comprising a cannula adapted to receive the fiber optic sheath, the cannula comprising a fluid insertion cannula.
13. The fiber optic sheath of claim 1 wherein the connector assembly comprises a mounting mechanism adapted to attach to an endoscope handle.
14. The fiber optic sheath of claim 1 wherein the inner tube extends proximally further than the outer tube.
15. The fiber optic sheath of claim 3 wherein a proximal end of the optical fibers are coupled at a proximal end to the light interface within the hub assembly.
16. The fiber optic sheath of claim 1 wherein the sheath comprises a cover unit.
17. The fiber optic sheath of claim 16 wherein a drape is attached to the cover unit.
18. The fiber optic sheath of claim 16 wherein the cover unit is attached to the mounting mechanism.
19. The fiber optic sheath of claim 1 further comprising a receiving chamber.
20. The fiber optic sheath of claim 19 wherein the receiving chamber is within the hub assembly.
21. The fiber optic sheath of claim 20 wherein the receiving chamber extends from an airspace within the inner tube.
22. The fiber optic sheath of claim 3 wherein the light interface optically couples the concentric array of illumination optical fibers to an optical fiber bundle within an endoscope handle at a handle interface.
23. The fiber optic sheath of claim 1 wherein the illumination optical fibers are connected to an illumination pigtail.
24. The fiber optic sheath of claim 12 wherein the cannula has a shaft and a luer for delivery of medication.
25. The fiber optic sheath of claim 1 wherein the sheath comprises a two piece disposable sheath including a mounting and cover unit that is attached to the drape and receives the tubular sheath.
26. The fiber optic sheath of claim 1 wherein the seal is cemented to the inner tube.
27. The fiber optic sheath of claim 1 wherein the optical coupler is adapted to connect to an external light source with a light connector.
28. A disposable fiber optic sheath for illuminating a region within a mammalian body comprising:
- a tubular sheath having an outer tube with a diameter of less than 2 mm and an inner tube;
- an array of optical fibers extending between the outer tube and the inner tube and defining a concentric illumination surface area at a distal end;
- a sealing element at the distal end of the sheath to provide a tubular cavity with an opening at a proximal end; and
- a hub assembly mounted at the proximal end of the tubular sheath, the hub assembly including a connector and an optical coupler that is optically coupled to a proximal end of the array of optical fibers.
29. The fiber optic sheath of claim 28 wherein the optical fibers comprise an optical fiber bundle at a proximal end that is attached to an optical coupler.
30. The fiber optic sheath of claim 28 wherein the tubular sheath comprises a rigid tube having a circular opening at the proximal end to receive an image collection tube.
31. The fiber optic sheath of claim 28 wherein the sealing element comprises a window that seals an airspace within the inner tube.
32. The fiber optic sheath of claim 28 wherein the base comprises a mounting mechanism to attach the sheath to an endo scope.
33. The fiber optic sheath of claim 32 further comprising an airspace for receiving an endoscope imaging tube having a first lens element, a second lens element and an aperture stop.
34. The fiber optic sheath of claim 28 wherein the optical coupler is adapted for optical coupling to an illumination source with an endo scope handle.
35. The fiber optic sheath of claim 28 wherein the illumination source is positioned in a control unit.
36. The fiber optic sheath of claim 28 further comprising a cannula having a fluid port.
37. The fiber optic sheath of claim 31 wherein the window is cemented to the inner tube to form an inner channel.
38. The fiber optic sheath of claim 28 wherein an annular channel extends between the outer tube and the inner tube.
39. The fiber optic sheath of claim 38 wherein the optical fibers fill the channel.
40. The fiber optic sheath of claim 28 further comprising a receiving chamber.
Type: Application
Filed: May 16, 2011
Publication Date: Mar 22, 2012
Inventors: Paul Remijan (Holland, MA), James E. McDonald (Dudley, MA)
Application Number: 13/108,480
International Classification: A61B 1/00 (20060101);