Blood set and chamber

• US 6,206,954 B1
• Filed: 12/22/1999
• Issued: 03/27/2001
• Est. Priority Date: 05/13/1998
• Status: Expired due to Term

• Current Assignee: Nxstage Medical Incorporated (Fresenius SE & Co. KGaA)
• Original Assignee: DSU Medical Corporation
• Inventors: Schnell, William J., Utterberg, David S.
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Cho, David J.
• Application Number:
  US09/472,316
• Time in Patent Office: 461 Days
• Field of Search: 604/403, 604/405, 604/406, 604/4-6, 604/65, 604/67, 604/80-83, 604/245, 604/246, 604/251, 604/254, 210/188, 210/436, 210/513, 210/801, 210/519, 961/77, 961/95, 962/09, 962/06, 962/15, 961/71
• US Class Current: 96/177
• CPC Class Codes: A61M 1/3627 Degassing devices; Buffer reservoirs; Drip chambers; Blood filters

Abstract

A combined arterial-venous blood flow set comprises connected lengths of flexible tubing for receiving blood from a patient, for conveying the blood to a blood processing device such as a dialyzer or an LDL filter, and for returning the blood to the patient. An optional first bubble trap chamber is connected in series flow between two of the lengths of tubing at a flow position downstream from the patient and upstream from the blood processing device. A second bubble trap chamber is connected in series flow between two of the lengths of tubing at a flow position downstream from the blood processing device and upstream from the patient. A first portion of the tubing which is in a flow position upstream from the blood processing device extends by the second bubble trap chamber, and is physically, laterally connected to it without direct flow connection. This helps to stabilize the positioning of components of the flow set and to reduce confusion in set-up and priming.

Claims

1. A bubble trap chamber which comprises a chamber-defining housing, a flow inlet tube extending into said chamber adjacent one side of said chamber and having an aperture that directs substantially the entire flow through said inlet tube horizontally into said chamber, said housing having an outlet port adjacent to the chamber bottom and positioned adjacent a side of said chamber opposed to said one side;

said chamber having a sidewall that defines a flow-diverting indentation positioned between said one side and said opposed side of the chamber, to interfere with a direct flow path for blood flowing through said chamber between said flow inlet tube and said outlet port.

2. The chamber of claim 1 in which said aperture of the flow inlet tube faces away from said outlet port by at least about 90°

.

3. The chamber of claim 1 in which said housing defines a cup-like main body defining a bottom wall and said sidewall, plus a fitting lid which is sealed to said main body to define a closed chamber, said lid also defining an integral tube extending through a recess defined by the outside of the portion of the sidewall that defines said indentation, said integral tube having opposed ends for connection to separate lengths of flexible tubing of a blood flow set.

4. The chamber of claim 1 in which said sidewall defines at least one side chamber that is vertically spaced from the bottom of said bubble trap chamber, said side chamber having a port for connection to tubing located externally of said bubble trap chamber.

5. The chamber of claim 1 in which a blood filter is carried in or adjacent to said outlet port, to filter blood passing through said outlet port.