Hypodermic apparatus for measuring hydrogen ion concentration of blood within a living body

• US 3,224,436 A
• Filed: 04/10/1961
• Issued: 12/21/1965
• Est. Priority Date: 04/10/1961
• Status: Expired due to Term

• Current Assignee: Le Massena Robert A
• Original Assignee: Le Massena Robert A
• Inventors: LE MASSENA ROBERT A
• Application Number:
  US04/101,797
• Time in Patent Office: 1,716 Days
• US Class Current: 600/361
• CPC Class Codes: A61B 5/14539 for measuring pH
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/1473 invasive, e.g. introduced into the body by a catheter A61B5/1482 takes precedence
• CPC Class Codes: A61B 5/6848 Needles
• CPC Class Codes: A61B 5/6849 in combination with a needle set

Claims

1. A PH ELECTRODE ASSEMBLY COMPRISING A HYPODERMIC NEEDLE HAVING AN AXIAL BORE AND AN OPEN, POINTED END, A GLASS PH ELECTRODE DISPOSED WITHIN SAID NEEDLE BORE AND HAVING A TUBE PORTION TERMINATING IN SAID BORE ADJACENT SAID NEEDLE END, AN ELONGATED WINDOW THROUGH THE WALL OF SAID NEEDLE EXTENDING FROM ADJACENT SAID NEEDLE END PARALEL TO THE AXIS OF SAID NEEDLE, A SECTION OF SAID TUBE PORTION WHICH IS IN REGISTER WITH SAID WINDOW BEING ARRANGED TO CONSTITUTE A PH-SENSITIVE MEMBRANE, A REFERENCE ELEACTRODE DISPOSED WITHIN SAID NEEDLE BORE AND HAVING A TUBE PORTION TERMINATING AT SAID OPEN END OF SAID NEEDLE AND HAVING A RELATIVELY SMALL END OPENING IN REGISTER WITH SAID OPEN END OF SAID NEEDLE, A SEPARATE ELECTRODE MEMBER INDIVIDUAL TO EACH OF SAID ELECTRODES, LOCATED WITHIN THE CORRESPONDING ONE OF SAID TUBE PORTIONS ENTIRELY WITHIN SAID NEEDLE BORE, AND PROVIDED WITH AND ELECTRICAL LEAD CONNECTION, AN ELECTRICALLY CONDUCTIVE SUBSTANCE IN SAID TUBE PORTION OF SAID GLASS ELECTRODE BRIDGING BETWEEN THE CORRESPONDING ONE OF SAID ELECTRODE