US 2003/0199824 A1 · DISPENSER FOR PATIENT INFUSION DEVICE · patentgrep

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Abstract

A device for delivering fluid, such as insulin for example, to a patient. The device includes an exit port assembly, a syringe-like reservoir including a side wall extending towards an outlet connected to the exit port assembly. A threaded lead screw is received in the reservoir and a plunger has an outer periphery linearly slideable along the side wall of the reservoir and an inner periphery threadedly received on the lead screw. The plunger is non-rotatable with respect to the side wall such that rotating the lead screw causes the plunger to advance within the reservoir and force fluid through the outlet. The device also includes a dispenser having a return element for causes rotation of the lead screw, and a shape memory element. A changeable length of the shape memory element decreasing from an uncharged length to a charged length resets the return element.

Claims135

Dependent claims

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly in the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotating the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
a dispenser including,
a gear secured to the lead screw and including radially extending teeth,
a moveable pawl positioned for contacting the teeth of the gear during reciprocating linear movement of the moveable pawl adjacent the gear in first and second opposing linear directions, wherein the moveable pawl and the teeth are shaped such that linear movement of the moveable pawl past the gear in the first linear direction causes rotation of the gear in the first rotational direction while linear movement of the moveable pawl past the gear in the second linear direction causes no rotation of the gear,
an elongated shape memory element having a changeable length decreasing from an uncharged length to a charged length when at least one charge is applied to the shape memory element, the shape memory element connected between the moveable pawl and at least one fixed member such that the changeable length of the shape memory element decreasing from an uncharged length to a charged length causes linear movement of the moveable pawl past the gear in one of the first and the second linear directions.

5 more elements

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly in the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotating the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
a gear secured to the lead screw and including radially extending teeth;
a moveable pawl assembly including,
a cage coaxially arranged with respect to the lead screw about the gear, the cage linearly movable in opposing first and second linear directions,
a first pawl extending from the cage and biased against the teeth of the gear, wherein the first pawl and the teeth are shaped and oriented such that the first pawl rotates the gear in the first rotational direction during linear movement of the cage in the first linear direction but causes no rotation of the gear during linear movement of the cage in the second linear direction and wherein the first pawl prevents rotation of the gear in an opposite second rotational direction, and
a second pawl extending from the cage and biased against the teeth of the gear, wherein the second pawl and the teeth are shaped and oriented such that the second pawl rotates the gear in the first rotational direction during linear movement of the cage in the second linear direction but causes no rotation of the gear during linear movement of the cage in the first linear direction and wherein the second pawl prevents rotation of the gear in the opposite second rotational direction.

6 more elements

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly in the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotating the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
a first gear secured to the lead screw and including radially extending teeth;
a second gear secured to the lead screw and including radially extending teeth, wherein the second gear is out of phase with the first gear;
a moveable pawl assembly including,
a cage movable in opposing first and second linear directions adjacent the gears,
a first pawl extending from the cage and biased against the teeth of the first gear, wherein the first pawl and the teeth of the first gear are shaped and oriented such that the first pawl rotates the first gear in the first rotational direction during linear movement of the cage in the first linear direction but causes no rotation of the first gear during linear movement of the cage in the second linear direction, and wherein the first pawl prevents rotation of the first gear in an opposite second rotational direction, and
a second pawl extending from the cage and biased against the teeth of the second gear, wherein the second pawl and the teeth of the second gear are shaped and oriented such that the second pawl rotates the second gear in the first rotational direction during linear movement of the cage in the first linear direction but causes no rotation of the second gear during linear movement of the cage in the second linear direction, and wherein the second pawl prevents rotation of the second gear in the opposite second rotational direction.

7 more elements

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly in the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotating the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
a gear coaxially secured to the lead screw for rotation therewith and including radially extending teeth;
a moveable pawl assembly including,
a cam pivotally mounted coaxially on the lead screw adjacent the gear for pivotal movement in opposing first and second pivotal directions about the lead screw;
a first pawl secured to the cam and extending towards the teeth of the gear, wherein the first pawl and the teeth of the gear are shaped and oriented such that the first pawl rotates the gear in the first rotational direction during pivotal movement of the cam in the first pivotal direction, but causes no rotation of the gear during pivotal movement of the cam in the second pivotal direction, and
a second pawl secured to the cam and extending towards the teeth of the gear, wherein the second pawl and the teeth of the gear are shaped and oriented such that the second pawl rotates the gear in the first rotational direction during pivotal movement of the cam in the first pivotal direction, but causes no rotation of the gear during pivotal movement of the cam in the second pivotal direction, and wherein the first and second pawls have different lengths.

6 more elements

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly within the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotation of the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
and
a dispenser including,
a barrel cam coaxial secured to the lead screw for rotation therewith and including a continuous circumferential groove with helical segments having orientations extending in the first rotational direction and successively alternating between opposing first and second ends of the barrel cam, and
a slide linearly movable in opposing first and second linear directions parallel with the lead screw and adjacent the gear, the slide including a finger extending from the slide and into the circumferential groove of the barrel cam, whereby, when the finger extends into one of the helical segments, linear movement of the slide causes rotation of the barrel cam and the lead screw in the first rotational direction.

5 more elements

A device for delivering fluid to a patient, comprising:

an exit port assembly;
a reservoir including a side wall extending towards an outlet connected to the exit port assembly;
a threaded lead screw received at least partly in the reservoir and extending towards the outlet;
a plunger secured to the lead screw and having an outer periphery linearly slideable along the side wall of the reservoir, wherein the plunger and the lead screw are operatively arranged such that rotating the lead screw in a first rotational direction causes the plunger to slide along the side wall towards the outlet of the reservoir;
a dispenser including,
a crankshaft operatively connected to the lead screw such that rotation of the crankshaft in a first rotational direction of the crankshaft causes rotation of the lead screw in the first rotational direction of the lead screw, the crankshaft including a main shaft rotatable about a longitudinal axis, at least one counter weight secured to the main shaft for rotation therewith, and at least one crank pin, the crank pin secured to the main shaft through the counter weight and having a longitudinal axis parallel to but radially offset from the longitudinal axis of the main shaft, and
at least one elongated shape memory element having a changeable length decreasing from an uncharged length to a charged length when at least one charge is applied to the shape memory element, the shape memory element connected between the crank pin and at least one member fixed with respect to the crankshaft such that the changeable length of the shape memory element decreasing from an uncharged length to a charged length causes rotation of the crankshaft.

4 more elements

Dependencies are inferred from the claim text.