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Disposable polarographic gas sensor system

  • US 4,269,685 A
  • Filed: 10/16/1979
  • Issued: 05/26/1981
  • Est. Priority Date: 10/16/1979
  • Status: Expired due to Term
First Claim
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1. A partially reusable, partially disposable blood gas sensor comprising:

  • (a) a reusable portion including an anode-cathode polarographic assembly, and electrical connectors for establishing a circuit from said polarographic electrodes to an external utilization device;

    (b) a disposable portion including(i) a housing defining a blood input port, a blood output port, a flow chamber therebetween, and a gas sensing region contacting at least a portion of said chamber;

    (ii) a gas permeable membrane sealably overlying said gas sensing region for contact with blood in said chamber;

    (iii) a gelatinous electrolyte, responsive to said gas, coating the side of said membrane opposite said chamber; and

    (iv) means, integral with said housing, for removably coupling said reusable portion to said disposable portion, said means for coupling imbedding said polarographic assembly into said gelatinous electrolyte, wherein said means for removably coupling comprises a protuberance from said housing, surrounding said membrane and enclosing said gelatinous matter, said protuberance defining a threaded portion and said reusable portion defining a matably corresponding portion for screwed attachment of said reusable portion with said protuberance, simultaneously imbedding said assembly into electrolyte;

    (c) wherein said polarographic assembly comprises a frustoconical, hollow anode, carrying a cathode generally axially therein; and

    (d) disposable plug means, duplicating the shape of said reusable portion, and insertible into said protuberance of said disposable portion for storage and shipment prior to use.

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