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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0444383 (1982-11-26) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 364 인용 특허 : 5 |
An implantable microinfusion pump system for dispensing medication at a prescribed infusion rate within the human body includes a hermetically sealed housing in which a power source and circuitry for actuating the pump are contained. A permanently magnetized piston is mounted for reciprocative fill
An implantable microinfusion pump system for dispensing medication at a prescribed infusion rate within the human body includes a hermetically sealed housing in which a power source and circuitry for actuating the pump are contained. A permanently magnetized piston is mounted for reciprocative fill and pump strokes within a pump chamber defined by a pump body member which extends between parallel-spaced walls of the housing. The body member communicates at one end with an expandable medicament reservoir adjacent one wall of the housing, and at the other end with a catheter for conveying medicament to the body. A two stage valve arrangement causes medicament to enter the pump chamber during fill strokes of short duration and to be dispensed from the pump chamber at the prescribed infusion rate during longer duration pump strokes. To minimize current drain from the power source the piston is driven through the shorter duration fill strokes by magnetic actuator windings within the housing, and through the longer duration pump strokes by magnetic attraction between the piston and a magnetic pole piece.
A microinfusion pump system for administering a fluid to the human body at a predetermined rate, comprising: a housing defining a pump chamber; a piston including a permanent magnet mounted for reciprocative movement in said pump chamber in a first direction comprising a pump stroke; valve means in
A microinfusion pump system for administering a fluid to the human body at a predetermined rate, comprising: a housing defining a pump chamber; a piston including a permanent magnet mounted for reciprocative movement in said pump chamber in a first direction comprising a pump stroke; valve means in said pump chamber responsive to reciprocation of said piston for urging fluid through said pump chamber, movement of said piston in one direction comprising a fill stroke for admitting fluid into said chamber, and movement of said piston in an opposite direction comprising a pump stroke for forcing fluid from said chamber; a magnetic actuator winding in magnetic communication with said piston; circuit means including said magnetic actuator winding for periodically actuating said magnetic winding to drive said piston along said fill stroke; and said permanent magnet coacting with said housing to drive said piston through said pump stroke upon termination of said fill stroke to meter fluid from said pump housing.
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