INTRAVASCULAR CATHETER WITH GAS-PERMEABLE TIP

• US 3,572,315 A
• Filed: 11/26/1968
• Issued: 03/23/1971
• Est. Priority Date: 11/26/1968
• Status: Expired due to Term

• Current Assignee: John S. Cullen
• Original Assignee: John S. Cullen
• Inventors: Cullen, John S.
• Application Number:
  US04/778,977
• Time in Patent Office: 847 Days
• US Class Current: 600/364
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06

Abstract

APPARATUS FOR EXTRACTING GASEOUS COMPONENTS FROM A LIQUID FOR ANALYSIS. A CATHETER HAVING A SEMI-PERMEABLE MEMBRANE AT ITS LEADING END IS INSERTED INTO THE BLOOD STREAM OF A PATIENT, THE MEMBRANE BEING PERMEABLE TO GASES CONTAINED IN WHOLE BLOOD BUT IMPERMEABLE WITH RESPECT TO THE BLOOD ITSELF. THE OPPOSITE END OF THE CATHETER IS CONNECTED TO ANALYSIS APPARATUS, SUCH AS A MASS SPECTROMETER, AND SUBATMOSPHERIC PRESSURE MEANS INDUCES GASEOUS FLOW FROM THE BLOOD STREAM THROUGH THE MEM-

BRANE AND INTO THE CATHETER AND THROUGH THE ANALYSIS APPARATUS.

Claims