US4364716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical pumping operation
Assignee: Schneider USA Inc
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Filing: 1981-02-23
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Granted: 1982-12-21
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Expires: 2001-02-23
Abstract
Abstract A perfusion pump comprising an assembly of inner and outer tubes interconnected by a field of perforations, a chamber configured to closely contain the tube assembly, valving apparatus for substantially closing the ends of the inner tube by compression against the chamber, and sources of positive and negative pressure gas selectively applicable against the wall of the outer tube.
Inventors
- 👤 Gilmore T. Schjeldahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:31
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/08; F04B43/10; F04B43/113
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A pump comprising, in combination: an inner flexible resilient tube extending along an axis and having an inlet end, an outlet end, and a wall with a field of perforations therethrough located medially between said ends; an outer flexible resilient tube of larger diameter coaxial with and surrounding said inner tube in the region of said field; means sealing the ends of said outer tube around the wall of said inner tube at sites beyond said field to define between said tubes a hollow, generally cylindrical space of predetermined normal volume; a housing defining a chamber configured to closely receive said tubes, said housing comprising two rigid portions meeting along a surface containing the axis of said tubes; means mutually hinging said portions to separate along said surface, for insertion and removal of said tubes; means in one of said portions connected to said chamber in the area of said field for subjecting said outer tube to positive and negative air pressures to compress and expand said outer tube; and means carried by said housing and separately actuable to compressively close the ends of said inner tubes.
Claim 2
Dependent Claim
187 words
A pump comprising, in combination: an inner flexible resilient tube extending along an axis and having an inlet end, an outlet end, and a wall with a field of perforations therethrough located medially between said ends; an outer flexible resilient tube of larger diameter coaxial with and surrounding said inner tube in the region of said field; means sealing the ends of said outer tube around the wall of said inner tube at sites beyond said field to define between said tubes a hollow, generally cylindrical space of predetermined normal volume; a housing defining a chamber configured to closely receive said tubes, said housing comprising two rigid portions meeting along a surface containing the axis of said tubes; means mutually hinging said portions to separate along said surface, for insertion and removal of said tubes; means in one of said portions connected to said chamber in the area of said field for subjecting said outer tube to positive and negative air pressures to compress and expand said outer tube; and means carried by said housing and separately actuable to compressively close the ends of said inner tubes.
Claim 3
Dependent Claim
224 words
A pump comprising, in combination: an inner flexible resilient tube extending along an axis and having an inlet end, an outlet end, and a wall with a field of perforations therethrough located medially between said ends; an outer flexible resilient tube of larger diameter coaxial with and surrounding said inner tube in the region of said field; means sealing the ends of said outer tube around the wall of said inner tube at sites beyond said field to define between said tubes a hollow, generally cylindrical space of predetermined normal volume; a housing defining a chamber configured to closely receive said tubes, said housing comprising two rigid portions meeting along a surface containing the axis of said tubes, each housing portion comprising a wall engaged by said inner tube at a site remote from one end of said field, a roller for engaging said inner tube at a site remote from the other end of said field, and means for actuating said roller into and out of engagement with said inner tube; means mutually hinging said portions to separate along said surface, for insertion and removal of said tubes; and means in one of said portions connected to said chamber in the area of said field for subjecting said outer tube to positive and negative air pressures to compress and expand said outer tube.
Claim 4
Dependent Claim
224 words
A pump comprising, in combination: an inner flexible resilient tube extending along an axis and having an inlet end, an outlet end, and a wall with a field of perforations therethrough located medially between said ends; an outer flexible resilient tube of larger diameter coaxial with and surrounding said inner tube in the region of said field; means sealing the ends of said outer tube around the wall of said inner tube at sites beyond said field to define between said tubes a hollow, generally cylindrical space of predetermined normal volume; a housing defining a chamber configured to closely receive said tubes, said housing comprising two rigid portions meeting along a surface containing the axis of said tubes, each housing portion comprising a wall engaged by said inner tube at a site remote from one end of said field, a roller for engaging said inner tube at a site remote from the other end of said field, and means for actuating said roller into and out of engagement with said inner tube; means mutually hinging said portions to separate along said surface, for insertion and removal of said tubes; and means in one of said portions connected to said chamber in the area of said field for subjecting said outer tube to positive and negative air pressures to compress and expand said outer tube.
Claim 5
Dependent Claim
39 words
Apparatus according to claim 2 together with means operable to actuate one of said roller actuating means to close the outlet end of said inner tube and simultaneously to apply negative pressure to said outer tube in said chamber.
Claim 6
Dependent Claim
37 words
A pump according to claim 2 and means operative to actuate one of said rollers to close the inlet end of said inner tube and simultaneously to apply positive pressure to said outer tube in said chamber.
Claim 7
Dependent Claim
71 words
A pump according to claim 2 together with means operable to first actuate one of said roller actuating means to close the outlet end of said tube and simultaneously apply negative pressure to said outer tube in said chamber, and to subsequently actuate the other of said roller activating means to close the inlet end of said inner tube and simultaneously apply positive pressure to said outer tube in said chamber.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |