Hydraulic pump with replaceable pumping member
First Claim
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1. A hydraulic pump comprising a casing and a pumping unit comprising:
- a. a fluid impermeable elastic tubular member;
b. a first and second pair of sealing rings sealingly connected to said elastic tubular member, each pair having;
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Abstract
A hydraulic pump particularly suited for the extracorporal circulation of blood, having a readily replaceable and disposable pumping member is disclosed. The pump avoids injury to the blood cells and creates a minimum of turbulence during the pumping operation, thus limiting the buildup of fibrin.
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Citations
8 Claims
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1. A hydraulic pump comprising a casing and a pumping unit comprising:
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a. a fluid impermeable elastic tubular member; b. a first and second pair of sealing rings sealingly connected to said elastic tubular member, each pair having; - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. an outer tubular ring surrounding a portion of the outer wall of said elastic tubular member, said outer tubular ring including means for aligning and holding said sealing rings in said casing;
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2. an inner tubular ring within said elastic tubular member and having an annular groove around the outer circumference of said inner tubular ring; 3. an O-ring within said annular grooves of said first and second inner tubular rings, said O-rings being in fluid sealing engagement with the inner surface of said elastic tubular member; c. said first pair of sealing rings having an inlet valve within the inner tubular ring, and d. said second pair of sealing rings having an outlet valve within the inner tubular ring, said elastic tubular member and said first and second pair of sealing rings defining a disposable unit which may be inserted in, or removed from the interior chamber of said casing which comprises means for creating alternately positive and negative pressure within the chamber to intermittently expand said elastic tubular member in said interior chamber.
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Specification