Fluid delivery device, transcutaneous access tool and fluid drive mechanism for use therewith

1. A fluid delivery device comprising: a fluid reservoir; a transcutaneous access tool fluidly coupled to the fluid reservoir; and a drive mechanism for driving fluid from the fluid reservoir, the drive mechanism comprising: a plunger received in the fluid reservoir; an elongated assembly comprising a first elongated member and a second elongated member; the first elongated member extending from the plunger; the second elongated member coupled to the first elongated member; a drive wheel; and a clutch mechanism coupled to the drive wheel wherein the clutch mechanism is configured to allow the second elongated member to pass through when disengaged and is configured to grip the second elongated member without threaded engagement when engaged, such that the drive wheel rotates the second elongated member to advance the first elongated member and the plunger into the fluid reservoir.

2. The fluid delivery device of claim 1 wherein: the first elongated member comprises a first threaded member; the second elongated member comprises a second threaded member; the second threaded member is in threaded engagement with the first threaded member, and the clutch mechanism is configured to allow the second threaded member to pass through when disengaged and is configured to grip the second threaded member without threaded engagement when engaged, such that the drive wheel rotates the second threaded member to advance the first threaded member and the plunger into the fluid reservoir.

3. The fluid delivery device of claim 2 wherein the first elongated threaded member comprises a first threaded shaft having external threads.

4. The fluid delivery device of claim 2 wherein the second elongated threaded member comprises a second threaded shaft having internal threads.

5. The fluid delivery device of claim 1 wherein the clutch mechanism includes a clutch spring that grips the second elongated member without threaded engagement when released.

6. The fluid delivery device of claim 5 wherein the clutch mechanism further includes a spring latch configured to hold the clutch spring in a disengaged position and configured to release the clutch spring such that the clutch spring moves to an engaged position.

7. The fluid delivery device of claim 6 wherein the spring latch is configured to release the clutch spring in response to movement of the drive wheel.

8. A method of operating a fluid delivery device comprising: providing the fluid delivery device, the device comprising a fluid reservoir; a transcutaneous access tool fluidly coupled to the fluid reservoir; and a drive mechanism for driving fluid from the fluid reservoir, the drive mechanism comprising an elongated assembly comprising a first elongated member and a second elongated member; the first elongated member extending from a plunger; the second elongated member coupled to the first elongated member; a drive wheel; and a clutch mechanism coupled to the drive wheel, wherein the clutch mechanism is configured to allow the second elongated member to pass through when disengaged and is configured to grip the second elongated member to pass through when disengaged and is configured to grip the second elongated member without threaded engagement when engaged, such that the drive wheel rotates the second elongated member to advance the first elongated member and the plunger into the fluid reservoir; holding the clutch mechanism in a disengaged position; filing the fluid reservoir with fluid; passing the second elongated member through the clutch mechanism such that the plunger is retracted within the fluid reservoir; releasing the clutch mechanism from the disengaged position; and engaging the clutch mechanism with the second elongated member.

9. The method of claim 8 wherein: the first elongated member comprises a first threaded member; the second elongated member comprises a second threaded member; the second threaded member is in threaded engagement with the first threaded member; and the clutch mechanism is configured to allow the second threaded member to pass through when disengaged and is configured to grip the second threaded member without threaded engagement when engaged, such that the drive wheel rotates the second threaded member to advance the first threaded member and the plunger into the fluid reservoir.

10. The method of claim 8 wherein:

the clutch mechanism includes a clutch spring; and

passing the second elongated member through the clutch mechanism further comprises passing the second elongated member through the clutch spring of the clutch mechanism.

11. The method of claim 10 wherein:

engaging the clutch mechanism with the second elongated member further comprises gripping the second elongated member without threaded engagement with the clutch spring.

12. The method of claim 10 wherein:

the clutch mechanism includes a spring latch; and

holding the clutch mechanism in a disengaged position further comprises holding the clutch spring in a disengaged position with the spring latch.

13. The method of claim 12 wherein:

releasing the clutch mechanism from the disengaged position further comprises releasing the clutch spring from the spring latch.

14. The method of claim 13 further comprising:

rotating the drive wheel to release the clutch spring from the spring latch.

15. The method of claim 8 further comprising: rotating the drive wheel to dispense e fluid from the fluid reservoir.