Dialysis instrument with dialysate side pump for moving body fluids
First Claim
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1. A single access dialysis instrument, comprising:
- a single catheter for transmission of body liquids to and from the body;
a reciprocating dialyzer with dialyzer membranes and having body liquid side disposed within said dialyzer membranes including means for defining a body fluid inlet and a body fluid outlet connected to said catheter, said reciprocating dialyzer further having a dialysate side disposed outside said dialyzer membranes including means for defining a dialysate inlet and a dialysate outlet, said body liquid side and said dialysate side separated by said dialyzer membranes, said dialyzer membranes being compliantly formed to expand and contract in response to a corresponding change in pressure between said body liquid and said dialysate within said dialyzer;
storage means connected to said dialysate inlet and said dialysate outlet for holding a supply of liquid including dialysate for use in said dialyzer; and
,dialyzer control means for controlling the inflow and outflow of body liquid and dialysate to and from said dialyzer in a reciprocating cyclic fashion while maintaining said dialysate within said dialysate side of said dialyzer at a non-elevated pressure throughout the entire cycle of said dialyzer, said dialyzer control means further for maintaining a positive pressure gradient from said body liquid side to said dialysate side throughout the reciprocating cycle of said dialyzer.
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Abstract
A dialysis instrument having a pump located on the dialysate side of a dialyzer for moving body fluids. A disposable cartridge mounted to a main frame includes containers of calcium chloride, priming solution, water, sorbent column, dialysate reservoir bag and potassium/hydrogen citrate reinfusate reservoir. A plurality of monitors detect the status of the flow of fluids and process of dialysis and provide data for the operation of a plurality of pumps and clamps to control the direction of flow of various fluids. The entire instrument is mounted on a scale to detect weight change due to the difference between inflow and outflow of body fluids.
405 Citations
13 Claims
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1. A single access dialysis instrument, comprising:
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a single catheter for transmission of body liquids to and from the body; a reciprocating dialyzer with dialyzer membranes and having body liquid side disposed within said dialyzer membranes including means for defining a body fluid inlet and a body fluid outlet connected to said catheter, said reciprocating dialyzer further having a dialysate side disposed outside said dialyzer membranes including means for defining a dialysate inlet and a dialysate outlet, said body liquid side and said dialysate side separated by said dialyzer membranes, said dialyzer membranes being compliantly formed to expand and contract in response to a corresponding change in pressure between said body liquid and said dialysate within said dialyzer; storage means connected to said dialysate inlet and said dialysate outlet for holding a supply of liquid including dialysate for use in said dialyzer; and
,dialyzer control means for controlling the inflow and outflow of body liquid and dialysate to and from said dialyzer in a reciprocating cyclic fashion while maintaining said dialysate within said dialysate side of said dialyzer at a non-elevated pressure throughout the entire cycle of said dialyzer, said dialyzer control means further for maintaining a positive pressure gradient from said body liquid side to said dialysate side throughout the reciprocating cycle of said dialyzer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification