Spring loaded implantable drug infusion device
AssigneeMedtronic, Inc.
InventorsSteven R. Christenson, Reginald D. Robinson, Kenneth T. Heruth, James M. Haase, James Randall, Christian Pèclat, Manfred K. Lüedi
Life of this patent
Estimating the term…
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.
Claims24
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.
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;
- 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.
An implantable drug infusion device comprising, in combination:
- 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.
An implantable drug infusion device comprising, in combination:
- 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.
An implantable drug infusion device comprising, in combination:
- 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.
Dependencies are inferred from the claim text.