Medicine dispensing device

• US 7,713,238 B2
• Filed: 04/06/2006
• Issued: 05/11/2010
• Est. Priority Date: 04/06/2005
• Status: Active Grant

• Current Assignee: Insulet Corporation, M2 Medical Group Holdings, Inc.
• Original Assignee: M2 Group Holdings Inc (Bigfoot Biomedical, Inc.)
• Inventors: Mernoe, Morten
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): Stigell; Theodore J
• Application Number:
  US10/591,190
• Publication Number:
  US 20070185449A1
• Time in Patent Office: 1,496 Days
• Field of Search: 604/131, 604151-155, 604207-211, 604/174, 128/DIG.1, 128/DIG.12
• US Class Current: 604/131
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2005/31518 designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
• CPC Class Codes: A61M 2205/103 rotating
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14276 specially adapted for implantation
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• CPC Class Codes: A61M 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump

Abstract

Some embodiments of a wearable, disposable medicine dispensing device may include a piston rod that is advanced to dispense medicine from the device. A rotational motor may be coupled to a drive mechanism so as to carry out a certain number of revolutions and thereby displace the piston rod by a desired distance. Such a device can be used in a method of dispensing liquid medicine.

Claims

1. A wearable medicine dispenser device, comprising:

a piston rod to force medicine from the device;

a drive mechanism to advance the piston rod, the drive mechanism comprising a pawl and a driven member, the pawl positioned to engage one or more teeth of the driven member, wherein the pawl is adjustable between a first position and a second position to incrementally advance the driven member; and

a rotational motor coupled to the pawl so that the pawl is at least partially adjusted toward one of the first position or the second position in response to one or more full rotations of the rotational motor.

2. The wearable medicine dispenser device of claim 1, further comprising an elongate string member coupled to the pawl and coupled to the rotational motor.

3. The wearable medicine dispenser device of claim 2, wherein one or more full rotations of the rotational motor causes the string member to act upon the pawl.

4. The wearable medicine dispenser device of claim 2, wherein the pawl comprises a pivotable body.

5. The wearable medicine dispenser device of claim 2, wherein the elongate string member comprises a flexible element selected from the group consisting of:

a string, a filament, a strip, and a ribbon.

6. The wearable medicine dispenser device of claim 1, further comprising a bias member coupled to the pawl to urge the pawl toward the second position and incrementally advance the driven member.

7. The wearable medicine dispenser device of claim 6, wherein the rotational motor pivots the pawl toward the first position in response to one or more full rotations of the rotational motor.

8. The wearable medicine dispenser device of claim 1, further comprising a housing that defines a cavity to receive a medicine container.

9. The wearable medicine dispenser device of claim 8, wherein the piston rod is advanced toward the medicine container when the medicine container is received in the cavity.

10. The wearable medicine dispenser device of claim 1, further comprising a control circuit device to repeatedly reverse the direction of rotation of the rotational motor.

11. The wearable medicine dispenser device of claim 1, wherein the driven member is a ratchet wheel.

12. The wearable medicine dispenser device of claim 11, wherein the pawl is adjustable to the first position in which the pawl is retracted away from one or more teeth of the ratchet wheel.

13. The wearable medicine dispenser device of claim 1, further comprising a linearly displaceable plate coupled to the pawl and coupled to the rotational motor.

14. The wearable medicine dispenser device of claim 13, wherein one or more full rotations of the rotational motor causes the linearly displaceable plate to act upon the pawl.

15. A wearable medicine dispenser device, comprising:

a piston rod to force medicine from the device;

a drive mechanism to advance the piston rod;

an elongate string member coupled to the drive mechanism; and

a rotational motor coupled to the string member so that one or more full rotations of the rotational motor causes the string member to adjust the drive mechanism to advance the piston rod.

16. The wearable medicine dispenser device of claim 15, wherein the drive mechanism comprises a pawl and a driven member, the pawl positioned to engage one or more teeth of the driven member to incrementally advance the driven member.

17. The wearable medicine dispenser device of claim 16, wherein the pawl comprises a pivotable body that is connected with the elongate string member.

18. The wearable medicine dispenser device of claim 17, wherein the one or more full rotations of the rotational motor twists the string member and causes the string member to pull upon the pivotable body to thereby adjust the pawl relative to the driven member.

19. The wearable medicine dispenser device of claim 16, wherein the driven member is a ratchet wheel.

20. The wearable medicine dispenser device of claim 19, wherein the pawl is positioned to engage one or more teeth of the ratchet wheel so as to incrementally rotate the ratchet wheel in a driving direction.

21. The wearable medicine dispenser device of claim 20, further comprising a second pawl positioned to engage the one or more teeth of the ratchet wheel to inhibit rotation of the ratchet wheel opposite the driving direction.

22. The wearable medicine dispenser device of claim 15, further comprising a housing that defines a cavity to receive a medicine container.

23. The wearable medicine dispenser device of claim 22, wherein the piston rod is advanced toward the medicine container when the medicine container is received in the cavity.

24. The wearable medicine dispenser device of claim 15, wherein the elongate string member comprises a flexible element selected from the group consisting of:

a string, a filament, a strip, and a ribbon.

25. The wearable medicine dispenser device of claim 15, wherein the string member comprises a loop such that the one or more full rotations of the rotational motor twists the loop.

26. The wearable medicine dispenser device of claim 15, further comprising a control circuit device to repeatedly reverse the direction of rotation of the rotational motor.

27. A wearable medicine dispenser device, comprising:

a housing that defines a cavity to receive a medicine container;

a piston rod movable in a forward direction toward the medicine container when the medicine container is received in the cavity;

a drive mechanism to advance the piston rod in the forward direction, the drive mechanism comprising a pawl and a ratchet wheel, the pawl positioned to engage one or more teeth of the ratchet wheel, wherein the pawl is pivotable between a first position and a second position to incrementally advance the ratchet wheel;

a bias member coupled to the pawl to urge the pawl toward the second position to incrementally advance the ratchet wheel;

an elongate string member coupled to the pawl; and

a rotational motor coupled to the string member so that one or more full rotations of the rotational motor causes the string member to twist and thereby urge the pawl toward the first position.

28. The wearable medicine dispenser device of claim 27, further comprising a second pawl positioned to engage the one or more teeth of the ratchet wheel to inhibit rotation of the ratchet wheel opposite the driving direction.

29. The wearable medicine dispenser device of claim 27, wherein the elongate string member comprises a flexible element selected from the group consisting of:

a string, a filament, a strip, and a ribbon.

30. The wearable medicine dispenser device of claim 27, wherein the string member comprises a loop such that the one or more full rotations of the rotational motor twists the loop.

31. The wearable medicine dispenser device of claim 27, further comprising a control circuit device to repeatedly reverse the direction of rotation of the rotational motor.

32. A method of dispensing liquid medicine, comprising:

in a dispensing cycle, rotating a motor one or more full revolutions in a first rotational direction to twist or untwist a string member and thereby adjusting a ratchet mechanism coupled to a piston rod, wherein the adjustment of the ratchet mechanism incrementally advances the piston rod in a forward direction to force medicine from a wearable medicine dispenser device; and

in a next dispensing cycle, rotating the motor one or more full revolutions in an opposite, second rotational direction to twist or untwist the string member and thereby adjusting the ratchet mechanism coupled to the piston rod, wherein the adjustment of the ratchet mechanism incrementally advances the piston rod in the forward direction to force medicine from the wearable medicine dispenser device.

33. The method of claim 32, wherein the ratchet mechanism comprises a pawl and a driven member, the pawl being positioned to engage one or more teeth of the driven member to incrementally advance the driven member.

34. The method of claim 33, wherein the pawl comprises a pivotable body that is connected with the string member, said rotating of the motor twists the string member and causes the string member to pull upon the pivotable body to thereby adjust the pawl relative to the driven member.

35. The method of claim 32, wherein the wearable medicine dispenser device comprises a housing that defines a cavity to receive a medicine container, the piston rod being advanced in the forward direction toward the medicine container when the medicine container is received in the cavity.