×

Apparatus and method for controlling ultrafiltration during hemodialysis

  • US 4,715,959 A
  • Filed: 05/03/1984
  • Issued: 12/29/1987
  • Est. Priority Date: 08/31/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. Hemodialysis ultrafiltration apparatus comprising:

  • hemodialysis means having a dialysate side including an input and an output;

    a source of fresh dialysate fluid;

    first positive displacement means for supplying fresh dialysate fluid from the source of fresh dialysate fluid to the input of the hemodialysis means;

    second positive displacement means for removing spent dialysate fluid from the output of the hemodialysis means to a dialyzer output circuit;

    ultrafiltration means for removing additional spent dialysate at a controlled rate from the output of the hemodialysis means to the dialyzer output circuit so as to effect removal of ultrafiltrate from blood in the hemodialysis means; and

    means for minimizing transients in dialysate pressure within the hemodialysis means caused by operation of the first positive displacement means and for reducing ultrafiltration error caused by system compliance, said means including pressure reducing and regulating means disposed between the source of fresh dialysate and the first positive displacement means for reducing the pressure of the fresh dialysate entering the first positive displacement means to below atmospheric pressure and for regulating the pressure of said fresh dialysate entering the first positive displacement means to substantially match the pressure on the dialysate side of the hemodialysis means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×