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DEVICE FOR THE DETERMINATION OF THE pH VALUE OF A BLOOD TEST SAMPLE

  • US 3,638,109 A
  • Filed: 04/22/1969
  • Issued: 01/25/1972
  • Est. Priority Date: 04/30/1968
  • Status: Expired due to Term
First Claim
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1. A measuring instrument for the determination of the pH value of a blood test sample, comprising a combination, a thermostated container, a measuring capillary tube containing said blood test sample and being located in said container and sealed off from the interior thereof, a first receiving bore in said container extending in transverse relation to and terminating in said measuring capillary tube, an electrical measuring and recording device, a pH-sensitive measuring electrode inserted in said receiving bore of said container in contact with the said blood test sample and electrically connected to said electrical measuring and recording device, a three-way valve comprising two stationary bearing bodies and a switch member orientably located in said bearing bodies, a first bearing bore extending through said container in transverse relation thereto and sealed off from the interior of said container, said first bearing bore being defined by one of said bearing bodies of said three-way valve, a lateral aperture originating in said measuring capillary tube and terminating in said first bearing bore, a second bearing body defining said second bearing bore in axial alignment with said first bearing bore, an electrolyte chamber located in said switch member and containing a liquid electrolyte, an inlet port in said switch member connected with one end of the said electrolyte chamber, an outlet port in said switch member connected with the other end of said electrolyte chamber, a second receiving bore in said switch member extending in transverse relation to said electrolyte chamber and terminating therein, a reference electrode inserted in said second receiving bore in contact with said liquid electrolyte and electrically connected to said measuring and recording device, an inlet pipe for said electrolyte having an inlet duct terminating in said second bearing bore of said second bearing body and cooperating with said inlet port of said switch member, an outlet pipe for said electrolyte having outlet duct terminating in said first bearing bore of said one bearing body, said outlet port of said switch member cooperating both with said outlet duct and with said lateral aperture of said measuring capillary tube, said switch body being manually orientable from a final rest position via an intermediate position into a final measuring position, said inlet and outlet ports of said switch body being closed in said final rest position of said switch member, said inlet port being connected with said inlet duct for the electrolyte and said outlet port being connected with said duct for the electrolyte in said intermediate position of said switch member, and said inlet port being closed and said outlet port being connected with said lateral aperture of said measuring capillary tube in said final measuring position of said switch member of said three-way valve.

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