Method and device for removing gas from gas containing blood

• US 6,827,862 B1
• Filed: 09/26/1997
• Issued: 12/07/2004
• Est. Priority Date: 05/09/1997
• Status: Expired due to Fees

• Current Assignee: Convergenza AG
• Original Assignee: Convergenza AG
• Inventors: Plechinger, Hans, Brockhoff, Alexander
• Primary Examiner(s): Kim, John
• Application Number:
  US08/938,173
• Time in Patent Office: 2,629 Days
• Field of Search: 210/188, 210/512.1, 210/782, 210/787, 210/788, 554/591, 554/592, 554/593, 554/595, 961/55, 962/04, 209/715, 209/725
• US Class Current: 210/787
• CPC Class Codes: A61M 1/3627 Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
• CPC Class Codes: A61M 2206/16 Rotating swirling helical flow, e.g. by tangential inflows
• CPC Class Codes: B04C 2003/006 Construction of elements by which the vortex flow is generated or degenerated
• CPC Class Codes: B04C 2005/133 Adjustable vortex finder
• CPC Class Codes: B04C 3/00 Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct combined with other devices B04C9/00

Abstract

A method and device for removing gas from gas containing blood. A non-rotating cyclone eddy chamber has the blood circulating therein and centrifugal force separates the blood radially outward and the gas radially inward. The cyclone inlet comprises a blood inlet channel that extends in a helical circular form developed to narrow in funnel like manner in the direction of flow toward the cyclone eddy chamber to accelerate the blood flow entering that chamber tangentially. A gas outlet is arranged in the radially inner center of the cyclone eddy chamber path while the blood outlet is coaxial and outward of the gas outlet.

Claims

1. A device for extracting gas bubbles from blood comprising:

a housing having an input channel and an outlet channel;

said input channel and said outlet channel being concentric along a housing axis;

a chamber section coupled to said input channel and located after said input channel, said chamber section having a chamber interior wall;

an eddy chamber coupled to said chamber section and located after said chamber section;

an outlet channel coupled to said eddy chamber and located after said eddy chamber;

an insert body located in said chamber section and extending into said eddy chamber;

at least one rib extending between said insert body and said chamber section interior wall, forming a helical groove in said chamber section and not extending into said eddy chamber;

said helical groove having constant cross sectional area but variable pitch along its length;

a gas outlet located along said axis in said eddy chamber;

whereby blood containing gas bubbles entering said input channel are directed into said chamber section where said helical groove accelerates said blood and causes it to enter said eddy chamber.

2. A device for extracting gas bubbles from blood comprising:

a housing having an input channel and an outlet channel;

said input channel and said outlet channel being concentric along a housing axis;

a chamber section coupled to said input channel and located after said input channel, said chamber section having a chamber interior wall

an eddy chamber coupled to said chamber section and located after said chamber section;

an outlet channel coupled to said eddy chamber and located after said eddy chamber;

an insert body located in said chamber section and extending into said eddy chamber;

at least one rib extending between said insert body and said chamber section interior wall, forming a helical groove in said chamber section and not extending into said eddy chamber;

said helical groove having variable cross sectional area but constant pitch along its length;

a gas outlet located along said axis in said outlet channel;

whereby blood containing gas bubbles entering said input channel are directed into said chamber section where said helical groove accelerates said blood and causes it to enter said eddy chamber.

3. A method of removing gas bubbles from blood comprising the steps of:

introducing blood into a helical groove where it is accelerated both axially and radially forming an accelerated blood flow;

introducing said accelerated blood flow into an eddy chamber along a tangent, where said blood is allowed to continue to turn while decelerating;

extracting a portion of said blood flow from a location near the central axis of flow.