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US 4,364,716 AGranted
Surgical pumping operation
AssigneeCathedyne Corporation
InventorGilmore T. Schjeldahl
Life of this patent
Estimating the term…
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.
Claims5
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.
5 more elements
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.
4 more elements
Dependencies are inferred from the claim text.