Patent application number | Description | Published |
20080286132 | REDUCING CYLINDER WEAR IN A DRUG PUMP - The present invention relates to a method and related apparatus for rotating a piston of a drug pump during the pumping stroke to reduce drug pump wear. The actuator may move a piston that pumps fluid through a pumping channel. In the present invention, the armature includes one or more openings or shapes that cause the actuator, including the armature and the piston, to rotate about a longitudinal axis of the piston during the pumping stroke. Rotation of the actuator member may help to reduce wear to the actuator member and the pump itself caused by repetitive pumping motions. | 11-20-2008 |
20080312595 | ARTICULATED ACTUATOR FOR IMPLANTABLE PUMP - The present invention is an actuator for a piston pump that includes a separately formed piston and armature. The piston and the armature are later assembled together or are inserted into the piston pump in such a manner as to cooperate during pumping. Assembling the piston and the armature as separate components may provide for improved form of the piston component when manufactured separately from the armature, due to, for example, increased simplification of the manufacturing process. In addition, effects of manufacturing the piston and the armature together, such as stress on the piston, may be reduced. | 12-18-2008 |
20100152714 | AIR TOLERANT IMPLANTABLE PISTON PUMP - An implantable infusion device includes a reservoir for housing an infusion medium and a drive mechanism having an inlet chamber, a piston and a piston channel. The inlet chamber is in fluid communication with the reservoir. The piston channel is in fluid communication with the inlet chamber, and has a distal end and a proximal end, the proximal end being closer to the inlet channel than the distal end. The piston is axially moveable within the piston channel to drive infusion medium out of the distal end of the piston channel. The clearance between the piston and the channel is sufficiently small to prevent undissolved gas in the inlet chamber from passing through the clearance. The inlet chamber may be sufficiently large to allow undissolved gas to accumulate without adversely affecting the performance of the infusion device. | 06-17-2010 |
20100280447 | MEDICAL PUMP WITH FIXED STROKE LENGTH - A method comprises measuring a volume of fluid delivered per pump stroke for each of a plurality of substantially identical medical pumps. The substantially identical medical pumps each have a fixed stroke length. The method further comprises: storing indications of the measured volumes on one or more data storage mediums; and for each of the plurality of substantially identical medical pumps, generating a separate therapy control program based on the indication of the measured volume associated with that one of the plurality of substantially identical medical pumps. | 11-04-2010 |
20100280501 | MODULAR MEDICAL PUMP ASSEMBLY - A medical pump subassembly comprises a magnetic cup forming a recess. The magnetic cup includes a protrusion within the recess. The cup forms a central aperture through the protrusion. The medical pump subassembly further comprises an electromagnetic coil within the recess and circumscribing the protrusion, a weld ring surrounding the recess, a barrier plate covering the recess, and a seal between the weld ring and the barrier plate to fluidically separate an interior of the cup from an external surface of the barrier plate. | 11-04-2010 |
20100280502 | MODULAR MEDICAL PUMP - An implantable medical device comprises a fluid reservoir configured to store a therapeutic agent; a port configured to deliver the therapeutic agent to a patient; a medical pump subassembly configured to actively transfer the therapeutic fluid from the fluid reservoir to the port; and a housing that contains the fluid reservoir, the port and the medical pump subassembly. The medical pump subassembly is configured to facilitate mechanical and electrical testing of the medical pump subassembly as a standalone component. | 11-04-2010 |
20120109099 | IMPLANTABLE MEDICAL PUMP DIAGNOSTICS - A method of detecting a fault condition within an implantable medical pump comprises delivering therapeutic fluid using a medical pump comprising an actuation mechanism configured to be energized to provide a pump stroke, detecting a property associated with energizing the actuation mechanism, and determining whether the property associated with energizing the actuation mechanism indicates that a fault condition exists with the medical pump. | 05-03-2012 |
20120197238 | MEDICAL PUMP WITH FIXED STROKE LENGTH - A method comprises measuring a volume of fluid delivered per pump stroke for each of a plurality of substantially identical medical pumps. The substantially identical medical pumps each have a fixed stroke length. The method further comprises: storing indications of the measured volumes on one or more data storage mediums; and for each of the plurality of substantially identical medical pumps, generating a separate therapy control program based on the indication of the measured volume associated with that one of the plurality of substantially identical medical pumps. | 08-02-2012 |
20130096503 | ACCUMULATOR FOR IMPLANTABLE INFUSION DEVICE - An accumulator is employed in an implantable infusion device to provide compliance in the flow path of the device. The accumulator may act to increase the pumping accuracy and repeatability while simultaneously reducing the energy requirements of the device. In one example, the accumulator is arranged at the outlet of a fluid delivery pump of the infusion device. The accumulator includes a cover and a diaphragm biased away from the cover and configured to deflect toward the cover under pressure generated by the therapeutic agent in a flow path of the infusion device. The cover of the accumulator is configured to withstand the pressure generated by the therapeutic agent in the flow path without deforming. | 04-18-2013 |
20130096537 | IMPLANTABLE INFUSION DEVICE INCLUDING ANTI-SEALING RESERVOIR - Techniques are disclosed for reducing the accumulation of gases in an implantable infusion device. In one example, an implantable infusion device (IID) includes a housing, an expandable and contractible reservoir, and a standoff member. The expandable and contractible reservoir is configured to store a therapeutic agent and is arranged within the housing. A first end of the reservoir is configured to collapse toward a second end of the reservoir as the reservoir contracts. The standoff member is interposed between the first end and the second end of the reservoir and is configured to hold at least a portion of the first end offset from the second end when the reservoir is in a contracted state. | 04-18-2013 |