Spring loaded implantable drug infusion device
First Claim
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1. An implantable drug infusion device comprising, in combination:
- a pump tube for holding a liquid to be pumped;
a race configured to support the tube along a path;
a roller assembly configured to compress the tube against the race at one or more points along the path, the roller assembly including at least one roller; and
a drive assembly to drive the roller assembly relative to the tube along the path so as to move the liquid through the tube;
wherein the roller assembly comprises at least one trailing arm pivotally connected to the roller assembly, each trailing arm having a roller pivotally secured at one end of the trailing arm, a biasing member to adjustably bias the roller against the pump tube, and a tube guide extending from the other end of the trailing arm to align the pump tube with respect to a corresponding roller.
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Abstract
An implantable drug infusion device includes a pump tube for holding a liquid to be pumped. A race is configured to support the tube. A roller assembly is configured to compress the tube against the race at one or more points along the path, and the roller assembly includes at least one roller. A drive assembly drives the roller assembly relative to the tube along the path so as to move the liquid through the tube. A biasing member is operably connected to the at least one roller to bias the at least one roller against the tube.
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Citations
24 Claims
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1. An implantable drug infusion device comprising, in combination:
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a pump tube for holding a liquid to be pumped;
a race configured to support the tube along a path;
a roller assembly configured to compress the tube against the race at one or more points along the path, the roller assembly including at least one roller; and
a drive assembly to drive the roller assembly relative to the tube along the path so as to move the liquid through the tube;
wherein the roller assembly comprises at least one trailing arm pivotally connected to the roller assembly, each trailing arm having a roller pivotally secured at one end of the trailing arm, a biasing member to adjustably bias the roller against the pump tube, and a tube guide extending from the other end of the trailing arm to align the pump tube with respect to a corresponding roller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An implantable drug infusion device comprising, in combination:
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a pump tube for holding a liquid to be pumped;
a race configured to support the tube along a path;
a roller assembly configured to compress the tube against the race at one or more points along the path, the roller assembly including at least one roller;
a drive assembly to drive the roller assembly relative to the tube along the path so as to move the liquid through the tube; and
a coil spring operably connected to the at least one roller to adjustably bias the at least one roller against the tube, wherein the coil spring is formed of a nitinol shape memory alloy.
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14. An implantable drug infusion device comprising, in combination:
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a bulkhead having a race;
a pump tube having an inlet and an outlet and being positioned within the race;
a roller assembly configured to compress the tube against the race at at least one point along the path, the roller assembly including at least one roller; and
a drive assembly to drive the roller assembly relative to the tube along the path so as to move a liquid through the tube;
wherein the roller assembly comprises at least one trailing arm pivotally connected to the roller assembly, each trailing arm having a roller pivotally secured at one end of the trailing arm, a biasing member to adjustably bias the roller against the pump tube, and a tube guide extending from the other end of the trailing arm to align the pump tube with respect to a corresponding roller. - View Dependent Claims (15, 16, 17, 18)
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19. An implantable drug infusion device comprising, in combination:
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a bulkhead having a race;
a pump tube having an inlet and an outlet and being positioned within the race;
a roller assembly configured to compress the tube against the race at at least one point along the path, the roller assembly including at least one roller;
a drive assembly to drive the roller assembly relative to the tube along the path so as to move a liquid through the tube; and
a coil spring operably connected to the at least one roller to adjustably bias the at least one roller against the tube, wherein the coil spring is formed of a nitinol shape memory alloy.
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20. An implantable drug infusion device comprising, in combination:
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a bulkhead having a race, a first chamber, and a second chamber;
a pump tube having an inlet and an outlet and being positioned within the race;
a motor assembly positioned within the first chamber; and
a pumphead assembly positioned within the second chamber, the motor assembly driving the pumphead assembly, the pumphead assembly comprising a roller assembly having a hub and three trailing arms, each trailing arm being pivotally connected to the hub, having a roller pivotally secured at one end of the trailing arm, a spring to bias a corresponding roller against the pump tube, and a tube guide extending from the other end of the trailing arm to align the pump tube with respect to a corresponding roller; and
a drive assembly to drive the roller assembly relative to the pump tube along the path so the rollers compress the pump tube to move a liquid through the pump tube. - View Dependent Claims (21, 22, 23, 24)
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Specification