US4487603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implantable microinfusion pump system
Assignee: Brown Brothers Harriman & Co
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Filing: 1982-11-26
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Granted: 1984-12-11
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Expires: 2002-11-26
Abstract
Abstract 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.
Inventors
- 👤 Donald L. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/14244; A61M5/14276; A61M5/14212; A61M5/14216; F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/048; A61M2205/00; A61M2205/35; A61M2205/3507; A61M2205/3523; Y; Y10; Y10S; Y10S128/00; Y10S128/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
160 words
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.
Claim 2
Dependent Claim
160 words
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.
Claim 3
Dependent Claim
39 words
A microinfusion pump system as defined in claim 1 wherein said housing includes a magnetic pole member of low magnetic retention capability, and said permanent magnet coacts with said pole piece to drive said piston through said pump stroke.
Claim 4
Dependent Claim
20 words
A microinfusion pump system as defined in claim 1 wherein said magnetic pole piece is formed of soft magnetic material.
Claim 5
Dependent Claim
25 words
A microinfusion pump system as defined in claim 1 wherein the magnetic poles of said permanent magnet are aligned with the axis of said piston.
Claim 6
Dependent Claim
21 words
A microinfusion pump system as defined in claim 1 wherein said magnetic winding is concentric with the axis of said piston.
Claim 7
Dependent Claim
28 words
A microinfusion pump system as defined in claim 1 wherein said actuator means include a pair of magnetic actuator windings arranged in magnetic communication with said permanent magnet.
Claim 8
Dependent Claim
35 words
A microinfusion pump system as defined in claim 1 wherein said valve means comprise a sleeve-type valve engaging the surface of said piston, and a slit-type valve at the outlet end of said pump housing.
Claim 9
Dependent Claim
177 words
A microinfusion pump system for infusing a fluid into the human body at a predetermined rate, comprising: a housing including parallel-spaced walls defining a sealed compartment within; means comprising a pump body member extending between said parallel-spaced walls, said body member defining a pump chamber; valve means including a piston having a permanent magnet mounted for reciprocative movement within said pump chamber; valve means in said pump chamber responsive to reciprocative movement of said piston for urging fluid through said pump chamber, movement of said piston in one direction comprising a fill stroke admitting fluid to said pump chamber, and movement of said piston in the 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 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.
Claim 10
Dependent Claim
177 words
A microinfusion pump system for infusing a fluid into the human body at a predetermined rate, comprising: a housing including parallel-spaced walls defining a sealed compartment within; means comprising a pump body member extending between said parallel-spaced walls, said body member defining a pump chamber; valve means including a piston having a permanent magnet mounted for reciprocative movement within said pump chamber; valve means in said pump chamber responsive to reciprocative movement of said piston for urging fluid through said pump chamber, movement of said piston in one direction comprising a fill stroke admitting fluid to said pump chamber, and movement of said piston in the 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 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.
Claim 11
Dependent Claim
16 words
A microinfusion pump system as defined in claim 8 wherein said housing is formed of titanium.
Claim 12
Dependent Claim
23 words
A microinfusion pump system as defined in claim 8 wherein said pump body member is welded to said parallel-spaced walls of said compartment.
Claim 13
Dependent Claim
31 words
A microinfusion pump system as defined in claim 8 including a fluid reservoir adjacent one of said walls, said pump chamber being in fluid communication with the interior of said reservoir.
Claim 14
Dependent Claim
22 words
A microinfusion pump system as defined in claim 8 wherein said magnetic actuator winding is concentric with the axis of said piston.
Claim 15
Dependent Claim
18 words
A microinfusion pump system as defined in claim 8 wherein said pump body member is of annular cross-section.
Claim 16
Dependent Claim
173 words
A microinfusion pump for infusing a fluid into 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; valve means responsive to said reciprocative movement of said piston for urging fluid through said pump chamber, movement of said piston in one direction comprising a fill stroke admitting fluid to said chamber, and movement of said piston in the opposite direction comprising a pump stroke for forcing fluid from said chamber, said valve means comprising an annular flange resiliently biased into engagement with the side wall of said piston, and being forced out of engagement with said side-wall by fluid in said pump chamber when said piston is in motion, said valve means including an additional valve at the outlet end of said pump chamber allowing flow only in a direction from said chamber; and circuit means including a magnetic winding for periodically initiating reciprocative movement of said piston to meter fluid through said pump chamber.
Claim 17
Dependent Claim
173 words
A microinfusion pump for infusing a fluid into 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; valve means responsive to said reciprocative movement of said piston for urging fluid through said pump chamber, movement of said piston in one direction comprising a fill stroke admitting fluid to said chamber, and movement of said piston in the opposite direction comprising a pump stroke for forcing fluid from said chamber, said valve means comprising an annular flange resiliently biased into engagement with the side wall of said piston, and being forced out of engagement with said side-wall by fluid in said pump chamber when said piston is in motion, said valve means including an additional valve at the outlet end of said pump chamber allowing flow only in a direction from said chamber; and circuit means including a magnetic winding for periodically initiating reciprocative movement of said piston to meter fluid through said pump chamber.
Claim 18
Dependent Claim
21 words
A microinfusion pump system as defined in claim 14 wherein said annular flange valve comprises a sleeve-type valve of annular cross-section.
Claim 19
Dependent Claim
17 words
A microinfusion pump system as defined in claim 15 wherein said additional valve comprises a slit-type valve.
Claim 20
Dependent Claim
145 words
A microinfusion pump system for infusing a fluid into 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; 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 admitting fluid to said chamber, and movement of said piston in the opposite direction comprising a pump stroke for forcing fluid from said chamber, said valve means comprising additional valve means at one end of said pump chamber for preventing flow through said valve chamber when said piston is at said end of said chamber; and circuit means including a magnetic actuator winding for periodically initiating reciprocative movement of said piston to meter fluid through said pump chamber.
Claim 21
Dependent Claim
145 words
A microinfusion pump system for infusing a fluid into 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; 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 admitting fluid to said chamber, and movement of said piston in the opposite direction comprising a pump stroke for forcing fluid from said chamber, said valve means comprising additional valve means at one end of said pump chamber for preventing flow through said valve chamber when said piston is at said end of said chamber; and circuit means including a magnetic actuator winding for periodically initiating reciprocative movement of said piston to meter fluid through said pump chamber.
Claim 22
Dependent Claim
21 words
A microinfusion pump system as defined in claim 17 wherein said additional valve means comprise an annular O-ring engaging said piston.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |