INFUSION SET FOR A FLUID PUMP
A medical device for delivery of a fluid to a patient from a line terminating in a tubing needle. The medical device includes a cannula assembly for coupling the fluid into a cannula that is inserted into the patient. The cannula assembly has a first locking element disposed in a fixed position with respect to the cannula. Coupling the line to the cannula assembly is an infusion flap. The infusion flap includes a second locking element for engaging the first locking element of the cannula assembly and a lift tab for disconnecting the infusion flap from the cannula assembly. Coupling of the first and second locking elements requires initial mating of the infusion flap and cannula assembly followed by locking through rotation of the infusion flap with respect to the cannula assembly.
This application is a continuation of U.S. patent application Ser. No. 16/276,914, filed Feb. 15, 2019, which is a continuation of U.S. patent application Ser. No. 14/930,031, filed Nov. 2, 2015, which is a continuation of U.S. patent application Ser. No. 11/533,882, filed Sep. 21, 2006, which is a continuation of U.S. patent application Ser. No. 10/151,733, filed May 20, 2002, which claims priority from U.S. Provisional Patent Application Ser. No. 60/291,881, filed May 18, 2001, and which is a continuation-in-part of U.S. patent application Ser. No. 10/037,614, filed Jan. 4, 2002, each of which is hereby incorporated by reference herein in its entirety.
TECHNICAL FIELD AND BACKGROUND ARTThe present invention relates to a system and method for delivery of a fluid to a patient, and more particularly, to an infusion set for a fluid pump that may be used, for example, to deliver insulin to a patient.
Currently, there are two primary methods of treating diabetes. One method involves taking multiple injections of long acting insulin on a daily basis. The second method is by continuous delivery of short acting insulin to more closely emulate the human pancreas. This may be accomplished using a syringe pump.
A syringe pump typically includes four major components. These components are a microprocessor controlled syringe pump, an insulin filled syringe, a hub and tubing set, and a cannula.
A syringe pump is often worn in a carrying case on a patient's belt, in a manner similar to a pager, or in more discrete locations such as a pocket or a brassiere. The syringe is mounted in the syringe pump and may hold enough insulin for three days. The hub serves as an interface between the syringe and a tubing set. At the end of a tubing set is a cannula typically made of either steel or Teflon. The cannula may advantageously be carried in a cannula assembly. The cannula assembly typically attaches to the patient by adhesive and is placed near the abdomen around and to the side of the navel. The cannula is inserted in fatty tissue and the insulin is injected subcutaneously.
A patient may perform activities that do not permit or are hindered by the presence of a pump, for example, when a patient wishes to take a shower or participate in certain athletic activities. Removing each of the components, including the cannula, would require a needle stick upon reconnecting the system to a patient. Since a needle stick is undesirable every time one wishes to take a shower or participate in sports, state of the art tubing sets disconnect at or near the cannula assembly, with the tubing capped to prevent contamination. Disconnecting and reconnecting the tubing set is sometimes difficult.
Cannulas with steel subcutaneous needles have been used with syringe pumps for decades. Steel needles, however, can cause irritation and discomfort. Soft cannulas, which may be made of Teflon, for example, help prevent this discomfort and are generally known in the art. The soft cannula requires the use of a steel insertion needle to penetrate skin and/or other tissue. When inserting the needle, the needle penetrates a first self-sealing septum in the cannula housing. The needle is then pushed through the soft cannula until it extends through the cannula's outer tip. After insertion of the needle into the skin, the steel needle is removed and the first septum seals the opening where the insertion needle entered. The tubing set may then be connected to the cannula by inserting a tubing needle at the end of the tubing set into a second septum in the cannula housing.
After removing the insertion needle, the first septum may be susceptible to leakage. This leakage may become more prevalent under pressure, such as when the cannula has an occlusion. Normally during an occlusion, the pressure will reach a threshold and trigger an alarm on the pump. However, if the first septum leaks, the pressure may never reach the threshold, and the pump may continue to deliver insulin. As a result, the insulin will continue to leak out of the first septum, the alarm will never trigger, and the user unknowingly does not receive the drug for an indefinite period of time.
SUMMARY OF THE INVENTIONIn a first embodiment of the invention there is provided a medical device for delivery of a fluid to a patient from a line terminating in a tubing needle. The medical device includes a cannula assembly for coupling the fluid into a cannula that is inserted into the patient. The cannula assembly has a first locking element disposed in a fixed position with respect to the cannula. Coupling the line to the cannula assembly is an infusion flap. The infusion flap includes a second locking element for engaging the first locking element of the cannula assembly and a lift tab for disconnecting the infusion flap from the cannula assembly. Coupling of the first and second locking elements requires initial mating of the infusion flap and cannula assembly, followed by locking through rotation of the infusion flap with respect to the cannula assembly.
In a related embodiment, the cannula assembly may include a septum housing defining a core coupled to the cannula. The septum housing includes a first septum positioned within the core at a first position, such that when the infusion flap and the cannula assembly are locked, the tubing needle penetrates the first septum so as to permit fluid communication between the line and the cannula. The septum housing may also include a second septum positioned within the core at a second position, such that an insertion needle can be introduced through the second septum into the cannula.
In another related embodiment of the invention, the cannula assembly further includes a flexible tube in fluid communication with both the cannula and a septum. When the flexible tube is in a first position, an insertion needle can be introduced through the septum into the cannula, and when the flexible tube is in a second position, a tubing needle inserted through the septum permits fluid communication between the line and the cannula.
In yet another related embodiment of the invention, the device further includes an insertion flap. The insertion flap includes an insertion needle for inserting through the septum and terminating with a sharp distal end disposed slightly beyond a distal end of the cannula. The insertion flap has an interface for coupling to an auto-insertion device.
In other related embodiments, the first locking element may be a locking lug and the second locking element is a lug receptacle, or vice versa. The cannula assembly may include a soft overmolded body.
In accordance with another embodiment of the invention, a medical device for delivery of a fluid to a patient from a line terminating in a tubing needle is presented that includes a cannula for insertion into the patient. A flexible tube is in fluid communication with both the cannula and a septum. When the flexible tube is in a first position, an insertion needle can be introduced through the septum into the cannula, and when the flexible tube is in a second position, a tubing needle inserted through the septum permits fluid communication between the line and the cannula.
In accordance with related embodiments of the invention, the device further includes an infusion flap that includes the tubing needle and a cannula assembly that includes the cannula. When the infusion flap and cannula assembly are mated, the tubing needle passes through the septum permitting fluid communication between the line and the cannula. The device may further include a locking mechanism for securing the infusion flap to the cannula assembly. The locking mechanism may include a locking tang on the infusion flap, the locking tang inserted into a tang receptacle on the cannula assembly. As another example, the locking mechanism may include a first locking element disposed on a septum housing containing the septum, and a second locking element disposed on the infusion flap. Coupling the first and second locking elements may require initial mating of the infusion flap and cannula assembly followed by locking through rotation of the infusion flap with respect to the cannula assembly. In various embodiments, the first locking element is a locking lug and the second locking element is a lug receptacle, or vice versa. In various embodiments, the septum housing can be rotated to a mating position that allows the infusion flap and the septum housing to be mated together and the infusion flap rotated with respect to the cannula assembly to lock the infusion flap onto the septum housing. The septum housing can then be rotated to a stable position that prevents rotation of the infusion flap.
In accordance with another embodiment of the invention, a method for delivering a fluid to a patient from a line terminating in a tubing needle is presented. The method includes inserting an insertion needle through a septum and a cannula, the septum and the cannula having a relative orientation. The cannula is inserted into tissue of a patient. After withdrawing the insertion needle from the cannula and the septum, a tubing needle is inserted through the septum. The relative orientation between the septum and the cannula is varied and the fluid is delivered through the line and the cannula.
In accordance with still another embodiment of the invention, a tubing set for coupling a fluid delivery device containing a fluid source into fluid communication with a cannula assembly is presented. The tubing set includes a length of tubing having a first end and a second end. A hub is coupled to the first end for connecting to the fluid delivery device. The hub includes a controller which allows the fluid delivery device to transition from a first configuration to a second configuration. An infusion flap is coupled to the second end for connecting to the cannula assembly.
In another related embodiment of the invention, the first configuration of the fluid delivery device may be a reservoir load position and the second Configuration may be an operate position. The controller may be capable of allowing the fluid delivery device to transition from the second configuration to the first configuration. The controller may include a flange that interfaces with the fluid delivery device. In other embodiments, the controller may include an electronic circuit to the fluid delivery device, or generating one of an optical signal and magnetic field. The hub may include a luer connector for mating with the fluid delivery device.
In another related embodiment of the invention, the fluid delivery device may be an infusion pump having a reservoir with variable volume and a drive assembly. The drive assembly includes a barrel having a clearance hole in a barrel end, the barrel characterized by a longitudinal barrel axis of rotation. The drive assembly further includes a plunger rod inserted through the clearance hole, and a rotating drive screw with external threads. The external threads removably engage with threads on the plunger rod by rotating the barrel about the barrel axis. The external threads are engaged with the threads on the plunger rod when in the first configuration and the external threads are disengaged with the threads on the plunger rod when in the second configuration. The controller is capable of allowing the barrel to rotate so as to bring the rod threads in and out of mechanical engagement with the drive screw threads. The controller may include a flange for dislodging a locking tab on the barrel, allowing the barrel to rotate.
In accordance with still another embodiment of the invention, a conduit for coupling to a fluid delivery device is presented. The conduit includes a length of tubing having a first end. A hub is coupled to the first end for connecting to the fluid delivery device. The hub includes a controller which allows the fluid delivery device to transition from a first configuration to a second configuration.
In related embodiments of the invention, the first configuration may be a reservoir load position and the second configuration may be an operate position. The hub may include a luer connector for mating with the fluid delivery device. The controller may include a flange that interfaces with the fluid delivery device. The controller may include an electronic circuit to the fluid delivery device, or generating one of an optical signal and magnetic field.
In still yet another embodiment of the invention, a method of providing flow of a fluid from a fluid delivery device to a porous medium is presented. The method includes coupling a hub, permanently affixed to a tube set, to the fluid delivery device. Configuration of the fluid delivery device is controlled via the hub. The tube set is coupled to the porous medium so as to allow fluid to flow from the fluid delivery device to the porous medium.
In related embodiments of the invention, controlling the configuration of the fluid delivery device may include allowing the pump to move from a first configuration to a second configuration. The first configuration of the fluid delivery device may be a load position and the second configuration may be an operate position. Controlling the configuration of the fluid delivery device may include moving a flange on the hub or generating one of a magnetic field and an optical signal. The fluid delivery device may be an infusion pump.
The foregoing features of the invention will be more readily understood by reference to the following detailed description, taken with reference to the accompanying drawings, in which:
cannula assembly, in accordance with one embodiment of the present invention;
The infusion set 10 includes a tubing set 11. The tubing set 11 includes tubing 13 that is attached at one end to a hub 12. The hub 12 serves as an interface between the tubing 13 and a pump assembly (not shown). Attached to the other end of the tubing set 11 is an infusion flap 14 that interfaces with a cannula assembly 15.
The cannula assembly 15 includes a cannula body 17. Attached to the cannula body 17 is a cannula 16, for subcutaneous insertion into the patient. The cannula 16 may be made of steel or alternatively, a soft and/or flexible material to help prevent patient discomfort, such as Teflon or other plastic. The cannula 16 may protrude from the bottom or side of the cannula body 17 at various angles. For example, without limitation, the cannula 16 may protrude from the front edge of the cannula body 17 at a shallow angle of 15-30 degrees. As another example, the cannula 16 may form a 90 degree angle with the bottom of the cannula body 17. Further detail of the cannula assembly 15 is provided in subsequent drawings including
Within the cannula body 17 is a passageway adapted to receive the proximal or upstream end of the cannula 16. The passageway includes at least one self-sealing septum that can be penetrated, for example, by an infusion or insertion needle.
The core insert 22 defines a passageway having a first end and a second end. The first end receives the proximal end of the cannula 16, as described above. The second end of the core insert 22 acts as septum housing 23. A self-sealing septum 24 is inserted into the open end of the septum housing 23, which is then ultrasonically flared to capture the septum 24 inside the core insert 22. The core insert 22 and locking ring 21 are then overmolded to form a soft body 17 for user comfort.
The body 17 of the cannula assembly is typically a compact and low profile component. When seen from the top, the cannula body 17 may be, for example, circular, elliptical or triangular in shape and/or advantageously elongated for easy patient handling. All or a portion 201 of the body 17 may be made clear or transparent to facilitate viewing of the core insert 22 and/or infusion site.
The cannula 16 may be inserted subcutaneously with the aid of an insertion flap 25. The insertion flap 25 includes an insertion needle 26, typically made of steel, that assists the cannula 16 in penetrating the skin. After inserting the cannula 16, the insertion flap 25 is removed, and the infusion flap 14 is removably attached to the cannula assembly 15 for delivery of fluid to the patient.
In accordance with one embodiment of the invention,
The proximal end of the insertion needle 26 is seated within a cylindrical shaped open ended (female) connector 31 that slides onto and mates with the male septum housing 23 of the cannula assembly 15. The distal end of the insertion needle 26 is inserted through the self-sealing septum 24, through the core insert 22, and into the cannula 16. When the insertion flap 25 and septum housing 23 are fully mated, the sharp tip of the insertion needle 26 may extend slightly beyond the distal end tip of the cannula 16. The insertion flap may interface with an auto-insertion device (not shown) that can be used, for example, by a patient lacking the dexterity or strength to subcutaneously insert the cannula 16 by him or her self. To interface with the auto-insertion device, the insertion flap 25 may include, for example, a flat top with a pair of wings 205 and 206 and mounting holes 203 and 204 for attaching the auto-insertion device (see
Referring back to
So as to prevent inadvertent separation of the infusion flap 14 and the cannula assembly 15, a locking mechanism may be provided. The locking mechanism may include, without limitation, a locking receptacle 43 on the female connector 45 of the infusion flap 14 that engages a locking lug 44 on the core insert 22 of the cannula assembly. The locking lug 44 may be disposed on the septum housing 23, for example.
In accordance with another embodiment of the invention,
As in previous embodiments, tubing 98 is coupled at a first end to the infusion flap 97, and to a hub (not shown) that interfaces with a pump assembly at a second end. An infusion needle 99 is attached to the inside of the tubing 98 at the first end and is seated within a generally cylindrically shaped, open ended, female connector 901 on the infusion flap 97. When the infusion flap 97 is mated to the cannula assembly 91, the connector 90 I slides onto and mates with the male septum housing 94, such that the infusion needle 99 pierces the second septum 93 allowing fluid in the tubing 98 to flow to the cannula 95.
To remove the infusion flap 97 from the cannula assembly 91, one lifts up on a lift tab 1201 and rotates the infusion flap 97 counter-clockwise. The infusion flap 97 is then pulled apart from the cannula assembly 91 and the second septum 93 (see
In accordance with another embodiment of the invention,
The septum housing 1304 is rotatably attached to the cannula assembly by, for example, a pivot or hinge mechanism. Attached to the septum housing 1304 and/or septum 1303 is a first end of a flexible tube 1306, which is further attached at a second end to a proximal end of a cannula 1307 mounted within the cannula assembly 1302. The flexible tubing 1306 may be attached to the septum housing 1304 and/or cannula assembly 1302 using, without limitation, a suitable adhesive.
Tubing 1308 is coupled at a first end to the infusion flap 1301, and to a hub (not shown) that interfaces with a pump assembly at a second end. An infusion needle 1309 is attached to the inside of the tubing 1308 at the first end and is seated within an open ended, female connector 1310 on the infusion flap 1301. The connector 1310 and male septum housing 1304 may be of variable shape, such as, for example, a cylindrical, rectangular, or square shape. When the infusion flap 1301 is mated to the cannula assembly 1302, the connector 1310 slides onto and mates with the male septum housing 1304, such that the infusion needle 1309 pierces the septum 1303 allowing fluid in the tubing 1308 to flow to the cannula 1307. In various embodiments, the infusion needle 1305 is slightly larger than the insertion needle 1305, so as to seal the hole previously created by the insertion needle 1305.
The infusion flap 1301 is easily connected and disconnected to the cannula assembly 1302.
To remove the infusion flap 1301 from the cannula assembly 1302, one lifts up on, and rotates the infusion flap 1301 90 degrees so that the septum housing 1304 is once again perpendicular to the longitudinal axis of the cannula assembly 1302. The infusion flap 1301 is then disengaged by pinching the locking tangs 1401 and 1402 towards each other, and pulling the infusion flap 1301 away from the cannula assembly 1302.
In accordance with another embodiment of the invention,
The open ended female connector 1910 (see
The locking lug 2001 is then engaged with the lug receptacle 2002 by rotating the infusion flap 25 counterclockwise (or clockwise depending on the location of the lug receptacle), as shown in
To remove the infusion flap 1901 from the cannula assembly 1902, one lifts up on a lift tab 2601 on the infusion flap 1901 and rotates the infusion flap 1901 90 degrees so that the septum housing 1904 is perpendicular to the longitudinal axis of the cannula assembly 1902. The infusion flap 1901 is then disengaged by rotating the infusion flap 90 degrees clockwise, and pulling the infusion flap 1901 away from the cannula assembly 1902.
Referring back to
The hub 12 may be of various shapes. For example, the hub 12 may be asymmetric, circular, or elliptical in shape. The hub 12 may be made of plastic, metal, or other suitable material. The hub 12 may include a receptacle for receiving the tubing 13. The tubing 13 may be permanently attached to the hub 12 using a suitable adhesive. In other embodiments, the tubing 13 may be removably attached to the hub 12 using, for example, a luer connection.
The hub 12 may include a controller which allows the fluid delivery device to transition from a first configuration to a second configuration. The first and second configuration may be, for example, a pump reservoir load position and a pump operate position, respectively. While the controller is implemented as a flange in following
The plunger rod 2840 is connected to the plunger with the rod's longitudinal axis displaced from and parallel to the longitudinal axis of the reservoir. The plunger rod 2840 is threaded for at least a portion of the rod's length. A cylindrical pump barrel 2845 receives the reservoir assembly 2715. The pump barrel constrains the plunger rod, orienting the rod along the longitudinal axis of the barrel. The pump barrel 2845 is contained in the pump assembly and may contain a locking mechanism, such as a locking tab, to prevent rotation of the pump barrel with respect to the assembly. A gear box 2855 in the pump assembly 2715 includes a drive screw 2850 along with motor and gears to turn the drive screw. The drive screw 2850 is threaded and the screw's longitudinal axis is aligned parallel to and displaced from the longitudinal axis of the pump barrel. The hub 2725 has a coupling to the top of the reservoir.
In a specific embodiment of the invention, the plunger rod threads and the drive screw threads are buttress threads. This embodiment advantageously addresses eliminating reaction forces on the plunger rod normal to the direction of the rod's longitudinal axis. Such reaction forces may cause the rod to deflect and skip a thread on the drive screw, resulting in under delivery of medication to the user. Buttress threads eliminate the normal component of the reaction force.
In an embodiment of the present invention, the locking hub 2725 may be connected to the reservoir 2830 by a tapered luer connection, as shown in
In another embodiment of the invention, a needle connection is provided between reservoir 2830 and hub 2725. As shown in
In a further embodiment of the invention, as shown in
Having described various illustrative embodiments of the present invention, some of its advantages and optional features, it will be apparent that such embodiments are presented by way of example only and not by way of limitation. Those skilled in the art could readily devise alterations and improvements on these embodiments, as well as additional embodiments, without departing from the spirit and scope of the invention. All such modifications are within the scope of the invention as claimed.
Claims
1. A medical device for delivery of a fluid to a patient from a line terminating in a tubing needle, the medical device comprising:
- a cannula assembly for coupling the fluid into a cannula for insertion into the patient, the cannula assembly having a first locking element disposed in a fixed position with respect to the cannula; and an infusion flap for coupling the line to the cannula assembly, the infusion flap comprising: a second locking element for engaging the first locking element of the cannula assembly; and a lift tab for disconnecting the infusion flap from the cannula assembly, wherein coupling of the first and second locking elements requires initial mating of the infusion flap and cannula assembly followed by locking through rotation of the infusion flap with respect to the cannula assembly.
2. The medical device according to claim 1, where the first locking element is a locking lug and the second locking element is a lug receptacle.
3. The medical device according to claim 1, wherein the first locking element is a lug receptacle and the second locking element is a locking lug.
4. The medical device according to claim 1, wherein the cannula assembly includes a septum housing defining a core coupled to the cannula, the septum housing including a first septum positioned within the core at a first position, such that when the infusion flap and the cannula assembly are locked, the tubing needle penetrates the first septum so as to permit fluid communication between the line and the cannula.
5. The medical device according to claim 4, wherein the septum housing includes a second septum positioned within the core at a second position, such that an insertion needle can be introduced through the second septum into the cannula.
6. The medical device according to claim 1, wherein the cannula assembly includes a soft overmolded body.
7. A medical device according to claim 1, the cannula assembly further including:
- a flexible tube in fluid communication with the cannula; and
- a septum in fluid communication with flexible tube, wherein, when the flexible tube is in a first position, an insertion needle can be introduced through the septum into the cannula, and when the flexible tube is in a second position, a tubing needle inserted through the septum permits fluid communication between the line and the cannula.
8. The device according to claim 1, further comprising an insertion flap, the insertion flap including an insertion needle for inserting into the passageway through the septum, the insertion flap when inserted further extending through the cannula and terminating with a sharp distal end disposed slightly beyond a distal end of the cannula.
9. The device according to claim 1, wherein the insertion flap has an interface for coupling to an auto-insertion device.
10. A hub for retaining a replaceable reservoir in a barrel in a pump housing, the barrel including a longitudinal axis, the hub comprising:
- a first end including a first end face disposed transverse to a hub axis, the first end face including a port disposed along the hub axis, the port having tubing affixed thereto for passage of fluid from the reservoir, the first end face having formed therein a grip to facilitate rotation of the hub about the hub axis; and
- a second end including a first male element for engaging with a corresponding female element on the reservoir to lock the hub to the reservoir and a second male element for engaging with a corresponding element of the pump housing to retain the reservoir in the barrel when (a) the hub is placed in the pump housing so that the hub axis corresponds with the barrel axis and (b) the hub is rotated.
11. A hub according to claim 10 wherein the grip is a cam.
12. A tubing set for coupling a fluid delivery device into fluid communication with a cannula assembly having a first locking element disposed in a fixed position with respect to a cannula, the tubing set further including:
- a length of tubing having a first end and a second end;
- a hub for retaining a replaceable reservoir in a barrel in a pump housing in the fluid delivery device, the barrel including a longitudinal axis, the hub comprising: (1) a first end including a first end face disposed transverse to a hub axis, the first end face including a port disposed along the hub axis, the port having the first end of the length of tubing affixed thereto for passage of fluid from the reservoir, the first end face having formed therein a grip to facilitate rotation of the hub about the hub axis, and (2) a second end including a first male element for engaging with a corresponding female element on the reservoir to lock the hub to the reservoir and a second male element for engaging with a corresponding element of the pump housing to retain the reservoir in the barrel when (a) the hub is placed in the pump housing so that the hub axis corresponds with the barrel axis, and (b) the hub is rotated; and an infusion flap coupled to the second end of the length of tubing for connecting to the cannula assembly, the infusion flap including: a tubing needle, a second locking element for engaging the first locking element of the cannula assembly, and a lift tab for disconnecting the infusion flap from the cannula assembly,
- wherein coupling of the first and second locking elements requires initial mating of the infusion flap and cannula assembly followed by locking through rotation of the infusion flap with respect to the cannula assembly.
13. The tubing set according to claim 12, where the first locking element is a locking lug and the second locking element is a lug receptacle.
14. The tubing set according to claim 12, wherein the first locking element is a lug receptacle and the second locking element is a locking lug.
15. The tubing set according to claim 12, wherein the cannula assembly includes a septum housing defining a core coupled to the cannula, the septum housing including a first septum positioned within the core at a first position, such that when the infusion flap and the cannula assembly are locked, the tubing needle penetrates the first septum so as to permit fluid communication between the line and the cannula.
16. The tubing set according to claim 12, wherein the septum housing includes a second septum positioned within the core at a second position, such that an insertion needle can be introduced through the second septum into the cannula.
17. The tubing set according to claim 12, wherein the cannula assembly includes a soft overmolded body.
18. The tubing set according to claim 12, the cannula assembly further including: a flexible tube in fluid communication with the cannula; and a septum in fluid communication with flexible tube, wherein, when the flexible tube is in a first position, an insertion needle can be introduced through the septum into the cannula, and when the flexible tube is in a second position, a tubing needle inserted through the septum permits fluid communication between the line and the cannula.
19. The tubing set according to claim 12, further comprising an insertion flap, the insertion flap including an insertion needle for inserting into the passageway through the septum, the insertion flap when inserted further extending through the cannula and terminating with a sharp distal end disposed slightly beyond a distal end of the cannula.
20. The tubing set according to claim 12, wherein the insertion flap has an interface for coupling to an auto-insertion device.
Type: Application
Filed: Aug 3, 2020
Publication Date: Nov 19, 2020
Inventors: Larry B. Gray (Merrimack, NH), Jared Hamilton (Manchester, NH), Richard Lanigan (Concord, NH), Brian Tracey (Litchfield, NH)
Application Number: 16/983,205