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

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 reservoir, the drive mechanism comprising:
• a plunger received in the reservoir;
• an elongated assembly comprising a first elongated member and a second elongated member;
• the first elongated member extending from the plunger, wherein the first elongated member comprises a leadscrew;
• the second elongated member coupled to the first elongated member, wherein the second elongated member comprises a nut;
• a drive wheel, the drive wheel operable with a clutch mechanism to rotate the nut to advance the leadscrew;
• and
• the 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 when engaged such that the drive wheel rotates the second elongated member to advance the first elongated member and the plunger into the reservoir.

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 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, wherein the first elongated member comprises a leadscrew;
• the second elongated member coupled to the first elongated member, wherein the second elongated member comprises a nut;
• a drive wheel, the drive wheel operable with a clutch mechanism to rotate the nut to advance the leadscrew;
• and
• the 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 when engaged such that the drive wheel rotates the second elongated member to advance the first elongated member and the plunger into the reservoir;
• holding the clutch mechanism in a disengaged position;
• filling the fluid reservoir with fluid;
• passing the second elongated member through the clutch mechanism such that the plunger is retracted within the reservoir;
• releasing the clutch mechanism from the disengaged position;
• and
• engaging the clutch mechanism with the second elongated member.