US3883272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump with replaceable pumping member
Assignee: Individual
•
Filing: 1973-04-16
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Granted: 1975-05-13
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Expires: 1993-04-16
Abstract
Abstract A hydraulic pump particularly suited for the extracorporal circulation of blood, having a readily replaceable and disposable pumping member is disclosed. An elastic tubular pumping member is fixed in fluid sealing engagement within the apertures in a fluid chamber formed of separable first and second portions. Inlet and outlet valves are fitted within the ends of the tubular pumping member for governing the flow of fluid. The tubular pumping member is maintained in a taut orientation during the outflow operation and expanded during the inflow operation. The pump avoids injury to the blood cells and creates a minimum of turbulence during the pumping operations, thus limiting the buildup of fibrin.
Inventors
- 👤 Benjamin V Puckett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:06
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/12; A; A61; A61M; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/113; A61M60/30; A61M60/36; A61M60/37; A61M60/40; A61M60/424; A61M60/427; A61M60/80; A61M60/835; A61M60/837; A61M60/845; A61M60/849; A61M60/851; A61M60/855; A61M60/89; A61M60/894; F04B43/00; F04B43/08; F04B43/10; F04B43/107; F04B9/00; F04B9/02; A61M1/00; A61M1/36; A61M1/3621; A61M2205/00; A61M2205/33; A61M2205/3331; A61M2205/3334; Y; Y10; Y10S; Y10S128/00; Y10S128/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
316 words
A pumping device comprising: a fluid casing having opposite end walls, each of said end walls having means defining openings extending therethrough; said fluid casing comprising a pair of casing members detachably connected to one another; each of said casing members having an inner wall, and means defining a cavity in said inner wall of each of said casing members; said cavities in said inner walls of said casing members cooperating with one another, when said casing members are connected to one another with their inner walls facing one another, to define a fluid chamber in said casing; a fitting disposed in each of said openings in each of said end walls of said casing; a generally tubular, impervious elastic member disposed between said fittings and extending through said fluid chamber in said casing; said generally tubular, impervious elastic member having end portions connected to said fittings and being in sealing engagement therewith, thereby the interior of said generally tubular, impervious elastic member is fluid-isolated from the fluid chamber surrounding the elastic member; said generally tubular, impervious elastic member and said fittings to which the ends of said elastic member are sealingly connected defining a disposable unit which may be selectively inserted in place in said casing or removed from said casing when said casing members are disconnected from one another; means connecting the interior of said fluid chamber to means creating alternately positive and negative pressure in said fluid chamber to intermittently expand said generally tubular, impevious elastic member in said fluid chamber; and valve means disposed in each of said fittings to permit a fluidto-be-pumped to enter one end wall of said casing and into said generally tubular, impervious elastic member when said elastic member is expanded and to permit such fluid-to-be pumped to be discharged through the other end wall of said casing when said elastic member returns to its original, non-expanded condition.
Claim 2
Dependent Claim
316 words
A pumping device comprising: a fluid casing having opposite end walls, each of said end walls having means defining openings extending therethrough; said fluid casing comprising a pair of casing members detachably connected to one another; each of said casing members having an inner wall, and means defining a cavity in said inner wall of each of said casing members; said cavities in said inner walls of said casing members cooperating with one another, when said casing members are connected to one another with their inner walls facing one another, to define a fluid chamber in said casing; a fitting disposed in each of said openings in each of said end walls of said casing; a generally tubular, impervious elastic member disposed between said fittings and extending through said fluid chamber in said casing; said generally tubular, impervious elastic member having end portions connected to said fittings and being in sealing engagement therewith, thereby the interior of said generally tubular, impervious elastic member is fluid-isolated from the fluid chamber surrounding the elastic member; said generally tubular, impervious elastic member and said fittings to which the ends of said elastic member are sealingly connected defining a disposable unit which may be selectively inserted in place in said casing or removed from said casing when said casing members are disconnected from one another; means connecting the interior of said fluid chamber to means creating alternately positive and negative pressure in said fluid chamber to intermittently expand said generally tubular, impevious elastic member in said fluid chamber; and valve means disposed in each of said fittings to permit a fluidto-be-pumped to enter one end wall of said casing and into said generally tubular, impervious elastic member when said elastic member is expanded and to permit such fluid-to-be pumped to be discharged through the other end wall of said casing when said elastic member returns to its original, non-expanded condition.
Claim 3
Dependent Claim
44 words
A pumping device according to claim 1, wherein said generally tubular, impervious elastic member is taut in its contracted condition, whereby no wrinkles will develop in said elastic member when said elastic member moves from its said expanded condition to its said contracted condition.
Claim 4
Dependent Claim
51 words
A pumping device according to claim 1, wherein said detachably connected casing members comprise of generally equal dimensions; and wherein said means connecting the interior of said fluid chamber to means creating alternately positive and negative pressure in said fluid chamber comprises an opening disposed in one of said casing halves.
Claim 5
Dependent Claim
290 words
A pumping device comprising: a fluid casing having opposite end walls; each of said end walls having means defining openings extending therethrough; means defining a fluid chamber in said fluid casing; a fitting disposed in each of said openings in each of said end walls of said casing; A generally tubular, impervious elastic member disposed between said fittings and extending through said fluid chamber in said casing; said generally tubular, impervious elastic member having end portions connected to said fittings and being in sealing engagement therewith, thereby the interior of said generally tubular, impervious elastic member is fluidisolated from the fluid chamber surrounding the elastic member; said generally tubular, impervious elastic member and said fittings to which the ends of said elastic member are sealingly connected defining a disposable unit which may be selectively inserted in place in said casing or removed from said casing; said generally tubular, impervious elastic member being expandable between an original condition and an expanded condition; means connecting the interior of said fluid chamber to means creating alternately positive and negative pressure in said fluid chamber to intermittently expand said generally tubular, impervious elastic member in said fluid chamber; valve means disposed in each of said fittings to permit a fluid-to-be-pumped to enter one end wall of said casing and into said generally tubular, impervious elastic member when said elastic member is expanded and to permit such fluid-to-be-pumped to be discharged through the other end wall of said casing when said elastic member returns to its original, non-expanded condition; said generally tubular, impervious elastic member being taut in its contracted condition, whereby no wrinkles will develop in said elastic member when said elastic member moves from its said expanded condition to its said contracted condition.
Claim 6
Dependent Claim
290 words
A pumping device comprising: a fluid casing having opposite end walls; each of said end walls having means defining openings extending therethrough; means defining a fluid chamber in said fluid casing; a fitting disposed in each of said openings in each of said end walls of said casing; A generally tubular, impervious elastic member disposed between said fittings and extending through said fluid chamber in said casing; said generally tubular, impervious elastic member having end portions connected to said fittings and being in sealing engagement therewith, thereby the interior of said generally tubular, impervious elastic member is fluidisolated from the fluid chamber surrounding the elastic member; said generally tubular, impervious elastic member and said fittings to which the ends of said elastic member are sealingly connected defining a disposable unit which may be selectively inserted in place in said casing or removed from said casing; said generally tubular, impervious elastic member being expandable between an original condition and an expanded condition; means connecting the interior of said fluid chamber to means creating alternately positive and negative pressure in said fluid chamber to intermittently expand said generally tubular, impervious elastic member in said fluid chamber; valve means disposed in each of said fittings to permit a fluid-to-be-pumped to enter one end wall of said casing and into said generally tubular, impervious elastic member when said elastic member is expanded and to permit such fluid-to-be-pumped to be discharged through the other end wall of said casing when said elastic member returns to its original, non-expanded condition; said generally tubular, impervious elastic member being taut in its contracted condition, whereby no wrinkles will develop in said elastic member when said elastic member moves from its said expanded condition to its said contracted condition.
Claim 7
Dependent Claim
78 words
A pumping device according to claim 4, wherein said fluid casing comprises a pair of casing members detachably connected to one another; each of said casing members having an inner wall and means defining a cavity in said inner wall; said cavities in said inner walls of said casing members cooperating with one another, when said casing members are connected to one another with their inner walls facing one another, to define said fluid chamber in said casing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |