Systems and methods allowing for reservoir air bubble management

• US 8,083,716 B2
• Filed: 12/26/2007
• Issued: 12/27/2011
• Est. Priority Date: 04/30/2007
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Kavazov, Julian D., Moberg, Sheldon B., Hanson, Ian B., Chong, Colin A., Lorenzen, Eric M., Bikovsky, Rafael, Luan, Truong Gia, Lee, Mike, Griffin, Christopher G., Miller, Thomas
• Primary Examiner(s): Ho, Jackie
• Assistant Examiner(s): STOHR, LEAH C
• Application Number:
  US11/964,649
• Publication Number:
  US 20080269681A1
• Time in Patent Office: 1,462 Days
• Field of Search: 604187-240, 604122-127, 604151-155
• US Class Current: 604/123
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2005/31516 reducing dead-space in the syringe barrel after delivery
• CPC Class Codes: A61M 2005/341 angularly adjustable or angled away from the axis of the injector
• CPC Class Codes: A61M 2209/045 for filling, e.g. for filling reservoirs
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/14248 of the skin patch type
• CPC Class Codes: A61M 5/165 Filtering accessories, e.g. blood filters, filters for infusion liquids A61M1/14 , A61M1/34, A61M1/3627, A61M1/3679, A61M1/3687 take precedence; needle sets with incorporated air inlet filters A61M5/162
• CPC Class Codes: A61M 5/36 with means for eliminating or preventing injection or infusion of air into body dialysis systems, blood oxygenators A61M1/14; haemofiltration equipment A61M1/34; automatic tube cut-off A61M39/281

Abstract

Various embodiments of the present invention are directed to limiting a presence of air bubbles in a fluidic medium expelled from a reservoir. In various embodiments, a plunger head within a reservoir is shaped so as to limit a presence of air bubbles in a fluidic medium expelled from the reservoir. Also, in various embodiments, a reservoir is shaped so as to limit a presence of air bubbles in a fluidic medium expelled from the reservoir. In some embodiments, both a reservoir and a plunger head within the reservoir are shaped so as to limit a presence of air bubbles in a fluidic medium expelled from the reservoir.

Claims

1. A plunger head moveable within a reservoir to expel fluidic media from an interior volume of the reservoir, the plunger head comprising:

a plunger head body having a front end and a rear end opposite the front end, the front end of the plunger head body defining an end of a front portion of the interior volume, the rear end of the plunger head body defining an end of a rear portion of the interior volume, the front end of the plunger head body having a concavity for trapping air bubbles in the fluidic media as the fluidic media is expelled from the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity; and

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

wherein the plunger head body and the seal member are arranged in the reservoir to prevent fluidic media from passing between the rear portion of the interior volume and the front portion of the interior volume.

2. The plunger head of claim 1, the front end of the plunger head body comprising:

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavity located between the first protrusion portion and the second protrusion portion.

3. The plunger head of claim 2, the first protrusion portion surrounding at least a portion of the second protrusion portion.

4. The plunger head of claim 3,

the first protrusion portion extending a first distance from the plunger head body;

the second protrusion portion extending a second distance from the plunger head body; and

the first distance greater than the second distance.

5. The plunger head of claim 4, the second distance greater than one-fourth of the first distance.

6. The plunger head of claim 2, the second protrusion portion including a cavity for receiving a portion of a needle.

7. The plunger head of claim 1,

the front end of the plunger head body portion including a curved surface that defines the concavity;

the curved surface having a first end position, a second end position, and an innermost position;

wherein a depth of the concavity is at least greater than one-half of a width of the bubble trap region from the first end position to the second end position.

8. The plunger head of claim 1, the front end of the plunger head body comprising:

a protruding portion protruding from the plunger head body, the concavity located within the protruding portion.

9. The plunger head of claim 1, wherein the seal member is a separate element from the plunger head body.

10. The plunger head of claim 1, wherein the seal member arranged on the side surface of the plunger head body is located between the front end of the plunger head body and a rear end of the plunger head body portion.

11. The plunger head of claim 1, the side surface of the plunger head body having a length dimension greater than a length dimension of the seal member.

12. The plunger head of claim 1, wherein the front end of the plunger head body contacts fluidic media in a case where fluidic media is contained in the interior volume of the reservoir.

13. The plunger head of claim 1, wherein the seal member is the only portion of the plunger head that engages the inner surface of the reservoir.

14. The plunger head of claim 1, wherein the plunger head body has a uniform width dimension along its axis.

15. The plunger head of claim 1,

the front end having a protruding portion in which the concavity is disposed;

the protruding portion spaced apart from the inner surface of the reservoir.

16. The plunger head of claim 1,

the front end having a protruding portion in which the concavity is disposed;

wherein a width dimension of the protruding portion is less than a width dimension of the reservoir; and

wherein the reservoir has a uniform width dimension along the axial direction of the reservoir.

17. The plunger head of claim 1,

the front end having a protruding portion in which the concavity is disposed;

wherein a distal portion of the protruding portion is spaced apart from the inner surface of the reservoir.

18. The plunger head of claim 1, wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir when the seal member is engaged with the inner surface of the reservoir.

19. The plunger head of claim 1, wherein the concavity of the plunger head body is out of fluid communication with the rear portion of the interior volume.

20. The plunger head of claim 1, wherein the rear end of the plunger head body is free from contact of fluidic media during all movement of the plunger head body.

21. The plunger head of claim 1, wherein the plunger head body and the seal member are arranged in the reservoir to prevent fluidic media from flowing through the plunger head body.

22. The plunger head of claim 1, wherein the plunger head body and the seal member are arranged in the reservoir to prevent fluidic media from passing between the front portion of the interior volume and the rear portion of the interior volume when the plunger head body is advanced in the reservoir and when the plunger head body is withdrawn in the reservoir.

23. A system for delivering fluidic media, the system comprising:

a reservoir, the reservoir comprising;

a reservoir body portion having an interior volume for containing fluidic media, the reservoir having a port in fluid flow communication with the interior volume of the reservoir body portion;

a plunger head moveable within the reservoir to expel fluidic media contained in the interior volume of the reservoir body portion, the plunger head comprising;

a plunger head body having a front end and a rear end opposite the front end, the front end of the plunger head body defining an end of a front portion of the interior volume, the rear end of the plunger head body defining an end of a rear portion of the interior volume, the front end of the plunger head body having a concavity for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion through the port of the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity; and

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

wherein the plunger head body and the seal member are arranged in the reservoir to prevent fluidic media from passing between the rear portion of the interior volume and the front portion of the interior volume.

24. The system of claim 23, the front end of the plunger head body comprising:

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavity located between the first protrusion portion and the second protrusion portion.

25. The system of claim 24, the first protrusion portion surrounding at least a portion of the second protrusion portion.

26. The system of claim 25,

the first protrusion portion extending a first distance from the plunger head body;

the second protrusion portion extending a second distance from the plunger head body; and

the first distance greater than the second distance.

27. The system of claim 26, the second distance greater than one-fourth of the first distance.

28. The system of claim 25, the second protrusion portion aligned with the port of the reservoir such that when a needle is inserted into the port of the reservoir, an end of the needle is directed toward the second protrusion portion.

29. The system of claim 24, the second protrusion portion including a cavity for receiving a portion of a needle.

30. The system of claim 24, the reservoir further comprising:

a reservoir bubble trap portion having a volume in fluid flow communication with the interior volume of the reservoir body portion, the reservoir bubble trap region for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion.

31. The system of claim 30, the first protrusion portion shaped and positioned such that the first protrusion portion substantially fills the volume of the reservoir bubble trap portion in a case where the plunger head is fully advanced within the reservoir.

32. The system of claim 30, the reservoir shaped such that in order for the fluidic media to flow from the volume of the reservoir bubble trap portion to the port of the reservoir, the fluidic media must flow through the interior volume of the reservoir body portion.

33. The system of claim 23, the system further comprising:

a drive device including a linkage portion and a motor for moving the linkage portion;

a plunger arm connected to the plunger head, the plunger arm having a mating portion for mating with the linkage portion of the drive device;

a first housing for housing the reservoir and for being secured to a user; and

a second housing for housing the motor of the drive device, the second housing configured to be selectively engaged with and disengaged from the first housing.

34. A system for delivering fluidic media, the system comprising:

a reservoir, the reservoir comprising;

a reservoir body portion having an interior volume for containing fluidic media, the reservoir having a port in fluid flow communication with the interior volume of the reservoir body portion; and

a reservoir bubble trap portion having a volume in fluid flow communication with the interior volume of the reservoir body portion, the reservoir bubble trap region for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion;

a plunger head moveable within the reservoir to expel fluidic media contained in the interior volume of the reservoir body portion, the plunger head comprising;

a plunger head body having a front end, the front end of the plunger head body having a concavit for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion through the port of the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity;

the front end of the plunger head body comprising;

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavit located between the first protrusion portion and the second protrusion portion;

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

wherein a contour of the first protrusion portion substantially matches an inner contour of the reservoir bubble trap portion.

35. A system for delivering fluidic media, the system comprising:

a reservoir, the reservoir comprising;

a reservoir body portion having an interior volume for containing fluidic media, the reservoir having a port in fluid flow communication with the interior volume of the reservoir body portion; and

a reservoir bubble trap portion having a volume in fluid flow communication with the interior volume of the reservoir body portion, the reservoir bubble trap region for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion;

a plunger head moveable within the reservoir to expel fluidic media contained in the interior volume of the reservoir body portion, the plunger head comprising;

a plunger head body having a front end, the front end of the plunger head body having a concavity for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion through the port of the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity;

the front end of the plunger head body comprising;

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavity located between the first protrusion portion and the second protrusion portion;

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

the first protrusion portion shaped and positioned such that the first protrusion portion extends at least partially into the volume of the reservoir bubble trap portion when the plunger head is sufficiently advanced within the reservoir.

36. A system for delivering fluidic media, the system comprising:

a reservoir, the reservoir comprising;

a reservoir body portion having an interior volume for containing fluidic media, the reservoir having a port in fluid flow communication with the interior volume of the reservoir body portion;

a reservoir bubble trap portion having a volume in fluid flow communication with the interior volume of the reservoir body portion, the reservoir bubble trap region for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion;

a material for shunting air bubbles in the fluidic media away from the port of the reservoir and toward the volume of the reservoir bubble trap portion as fluidic media is expelled from the interior volume of the reservoir body portion;

a plunger head moveable within the reservoir to expel fluidic media contained in the interior volume of the reservoir body portion, the plunger head comprising;

a plunger head bod having a front end the front end of the plunger head body having a concavity for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion through the port of the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity;

the front end of the plunger head body comprising;

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavity located between the first protrusion portion and the second protrusion portion;

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head.

37. A system for delivering fluidic media, the system comprising;

a reservoir, the reservoir comprising;

a reservoir body portion having an interior volume for containing fluidic media, the reservoir having a port in fluid flow communication with the interior volume of the reservoir body portion;

a reservoir bubble trap portion having a volume in fluid flow communication with the interior volume of the reservoir body portion, the reservoir bubble trap region for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion;

the reservoir having a channel that leads from the interior volume of the reservoir body portion to the port of the reservoir;

the reservoir bubble trap portion comprising;

a first portion that extends from the reservoir body portion away from the interior volume of the reservoir body portion; and

a second portion that returns back toward the interior volume of the reservoir body portion;

a plunger head moveable within the reservoir to expel fluidic media contained in the interior volume of the reservoir body portion, the plunger head comprising;

a plunger head body having a front end, the front end of the plunger head body having a concavity for trapping air bubbles in the fluidic media as the fluidic media is expelled from the interior volume of the reservoir body portion through the port of the reservoir by the plunger head the front end of the plunger head bod defining a wall around the concavity;

the front end of the plunger head body comprising;

a first protrusion portion protruding from the plunger head body; and

a second protrusion portion protruding from the plunger head body, the concavity located between the first protrusion portion and the second protrusion portion;

a seal member arranged along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

wherein the reservoir bubble trap portion encircles at least a portion of the channel of the reservoir.

38. A method of manufacturing a plunger head moveable within a reservoir to expel fluidic media from an interior volume of the reservoir, the method comprising:

providing a plunger head body having a front end and a rear end opposite the front end, the front end of the plunger head body defining an end of a front portion of the interior volume, the rear end of the plunger head body defining an end of a rear portion of the interior volume, the front end of the plunger head body having a concavity for trapping air in the fluidic media as the fluidic media is expelled from the reservoir by the plunger head, the front end of the plunger head body defining a wall around the concavity; and

arranging a seal member along a side surface of the plunger head body that is substantially parallel with an inner surface of the reservoir to engage the inner surface of the reservoir, the seal member arranged at a location on the side surface that is spaced apart from the front end of the plunger head body;

wherein the wall of the plunger head body is spaced apart from the inner surface of the reservoir as the fluidic media is expelled from the reservoir by the plunger head; and

wherein the plunger head body and the seal member are arranged in the reservoir to prevent fluidic media from passing between the rear portion of the interior volume and the front portion of the interior volume.