Artificial kidney proportioning system

• US 4,172,033 A
• Filed: 10/13/1977
• Issued: 10/23/1979
• Est. Priority Date: 12/23/1974
• Status: Expired due to Term

• Current Assignee: CD Medical Incorporated (Baxter International Inc.)
• Original Assignee: DWS, Inc.
• Inventors: Willock, Charles B.
• Primary Examiner(s): Spear, Jr., Frank A.
• Application Number:
  US05/841,990
• Time in Patent Office: 740 Days
• Field of Search: 210/22, 210/87, 210/90, 210/96 M, 210/321 B, 210/91, 210/85
• US Class Current: 210/91
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: A61M 1/1641 linked by pistons
• CPC Class Codes: Y10S 210/929 Hemoultrafiltrate volume measurement or control processes

Abstract

An artificial kidney dialysate system provides a predetermined rate of flow of dialysate solution into a dialyzer, and a predetermined rate of flow of dialysate solution from the outlet of the dialyzer. Through positive displacement pumping at the inlet and outlet of the dialyzer, the two rates can be adjusted so that an accurately predetermined quantity of excess fluid from the patient'"'"'s blood stream can be withdrawn into the dialysate solution.

Claims

1. An artificial kidney system comprising a dialyzer having an input and an output for dialyzing solution,

pump means for supplying a dialyzing solution to and removing dialyzing solution and ultrafiltrate from said dialyzer at pressures to cause ultrafiltration at a range of desired rates,

said pump means including a positive displacement piston and cylinder input pump and a positive displacement piston and cylinder output pump, each having a piston rod projecting from its cylinder,

and means connected to said rods for indicating the rate of ultrafiltration.

2. An artificial kidney machine as recited in claim 1 in which the last named means adjusts the relative rates of operation of the two pumps.