Blow molded venous drip chamber for hemodialysis

• US 5,330,425 A
• Filed: 05/11/1993
• Issued: 07/19/1994
• Est. Priority Date: 04/30/1992
• Status: Expired due to Term

• Current Assignee: Nxstage Medical Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: David S. Utterberg
• Inventors: Utterberg, David S.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): SMITH, CHALIN A
• Application Number:
  US08/059,316
• Time in Patent Office: 434 Days
• Field of Search: 604/4-7, 604/82-86, 604/251-255, 604/285, 604/405, 604/406, 604/29
• US Class Current: 604/83
• CPC Class Codes: A61M 1/362262 Details of incorporated reservoirs
• CPC Class Codes: A61M 1/362264 the filter being a blood filter
• CPC Class Codes: A61M 1/3627 Degassing devices; Buffer reservoirs; Drip chambers; Blood filters

Abstract

A blow molded, rigid plastic venous chamber for hemodialysis, for use in a venous hemodialysis set. The chamber defines a plurality of first access ports adjacent to a first end thereof. A second access port is provided at an opposed end. A tubular plastic filter is positioned in close-fitting relation within the second access port to project into the chamber. Unique advantages are provided by such a blow-molded, filter-carrying chamber.

Claims

1. In a dialysis system which comprises a dialysis set mounted in a dialysis machine, said dialysis set comprising a venous chamber, the dialysis machine carrying a bubble detector and a downstream clamp, each being engaged with said dialysis set, the improvement comprising an injection site positioned on said set downstream from said venous chamber, but upstream of the bubble detector and downstream clamp of said dialysis apparatus, whereby drugs may be administered through the injection site of the set to the patient.

2. The dialysis system of claim 1 in which said venous chamber comprises a blow-molded plastic blood chamber defining an inlet blood tube connecting port adjacent a first end, an outlet blood tube connecting port at an opposed chamber end, and a tubular plastic filter positioned in close-fitting relation within said outlet port to project into said chamber.

3. The dialysis system of claim 2 in which said blow-molded chamber defines an indentation within said outlet port, said tubular plastic filter defining an outer end portion that carries a radially outwardly projecting, annular flange proportioned to slidingly pass through said outlet blood tube connecting port, and engaging said indentation to limit inward travel of said filter to a predetermined, innermost position, plus means for retaining said filter in said position.

4. The dialysis system of claim 3 in which said retaining means comprises flexible tubing sealed within said outlet port at a position outwardly of said plastic filter, whereby said flange and plastic filter are retained within said outlet port by the presence of said tubing.

5. The dialysis system of claim 2 in which said venous chamber is a blow molded chamber having said inlet port positioned in separate, lateral relation to said chamber, and from which extends a conduit toward said opposed end in said separate, lateral relation, while also communicating with said chamber at a position between said first and opposed ends.

6. The dialysis system of claim 5 in which said conduit curves to communicate with said chamber in horizontal direction at a position between said first and opposed ends, a portion of said chamber opposed to the area of communication of said conduit and chamber defining a curved shoulder to turn horizontal blood flow across said chamber gently upwardly, back toward said first end of the chamber to define a gentle, circulatory flow of blood in said chamber.

7. The dialysis system of claim 6 in which a portion of said chamber adjacent said first end is relatively oval in cross section, while a portion of said chamber adjacent said opposed end is relatively circular in cross section.

8. The dialysis system of claim 2 in which said venous chamber is made of blow-molded plastic and has an inlet port positioned in separate, lateral relation to said chamber and from which extends a conduit in said separate, lateral relation toward the end of said venous chamber which is opposed to the end associated with said inlet port, said conduit communicating through an end port with said chamber at said opposed end.

9. The dialysis system of claim 8 in which said venous chamber defines an outlet port at said opposed end, and a partition positioned between said outlet port and the end port which communicates with said inlet port.