DIALYSIS METHOD AND APPARATUS

• US 3,727,612 A
• Filed: 01/18/1971
• Issued: 04/17/1973
• Est. Priority Date: 01/18/1971
• Status: Expired due to Term

• Current Assignee: Joseph G. Bohorfoush, Robert S. Sayers
• Original Assignee: Joseph G. Bohorfoush, Robert S. Sayers
• Inventors: Sayers, Robert S., Bohorfoush, Joseph G.
• Primary Examiner(s): Zaharna, Samih N.
• Assistant Examiner(s): Barnes, Richard
• Application Number:
  US05/107,107
• Time in Patent Office: 820 Days
• Field of Search: 210/22,321 23/258.5 128/214R
• US Class Current: 604/6.09
• CPC Class Codes: A61M 1/1649 with pulsatile dialysis fluid flow
• CPC Class Codes: A61M 1/1696 with dialysate regeneration
• CPC Class Codes: A61M 1/1698 Blood oxygenators with or without heat-exchangers intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00
• CPC Class Codes: A61M 1/267 used for pumping
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: B01D 2313/50 Specific extra tanks
• CPC Class Codes: B01D 61/28 Apparatus therefor
• CPC Class Codes: B01D 63/06 Tubular membrane modules
• CPC Class Codes: B01D 63/069 comprising a bundle of tubular membranes

Abstract

A method of dialytic conditioning of blood in which the blood is continuously circulated through a dialytic exchange member comprising an elongated tubular chamber having at least one semipermeable tubing member longitudinally disposed therein. In a preferred embodiment a plurality of semipermeable tubes are concentrically disposed in the tubular chamber, allowing circulation of blood and one, two or more dialysis fluids simultaneously.

Claims

1. A method of dialytic blood conditioning of a patient'"'"''"'"'s blood in which the blood is continuously removed from the patient'"'"''"'"'s bloodstream, circulated through a dialytic exchange member and returned to said bloodstream;

characterized in that said exchange member comprises inner and outer semipermeable tubing members concentrically disposed in an elongated tubular chamber, said blood being circulated through a first annular space between said tubing members, dialyzing fluids being circulated through the said inner tubing member and a second annular space surrounding said outer tubing member, said dialyzing fluid being returned to a reservoir where it is treated by dialysis with a secondary dialyzing fluid, being circulated from a second reservoir.

2. Apparatus for dialytic conditioning of a fluid comprising:

a dialytic exchange member comprising an elongated tubular chamber having at least two concentric semipermeable tubing members, longitudinally and concentrically disposed therein;

control and connector means at each end of said exchange member for circulating said fluid through said exchange members for conditioning thereof;

dialyzing fluid reservoir means; and

flow means connected to said reservoir means and said exchange member for circulating dialyzing fluid from said reservoir means through said exchange member;

said reservoir means comprising a first reservoir containing a first dialyzing fluid and a second reservoir containing a second dialyzing fluid, said reservoirs being connected by a flow loop partially comprising a semipermeable exchange membrane whereby dialysis takes place between said first and second dialyzing fluids.

3. A method of dialytic conditioning of a patient'"'"''"'"'s blood in which the blood is continuously removed from the patient'"'"''"'"'s bloodstream, circulated through a dialytic exchange member and returned to said bloodstream;

characterized in that said exchange member comprises inner, intermediate and outer semipermeable tubing members concentrically disposed in an elongated tubular chamber, said blood being circulated through a first annular space between said inner and intermediate tubing members, dialyzing fluids being circulated through the said inner tubing member and a second annular space surrounding said intermediate tubing member, a secondary dialyzing fluid being circulated through a third annular space, said outer tubing member defining the interior thereof, for dialysis of the dialyzing fluid in said second annular space.