DEVICE FOR THE DETERMINATION OF THE pH VALUE OF A BLOOD TEST SAMPLE
First Claim
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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Accused Products
Abstract
A measuring instrument for the determination of the pH value of a blood test sample including a three-way valve wherein its switch body comprises an electrolyte chamber into which the measurement-sensitive extremity of a reference electrode protrudes, the chamber having an inlet and an outlet in which the outlet is closed in a first end position of the switch body, each inlet and outlet communicating with a corresponding inlet and outlet port for the electrolyte in an intermediate position whereas, in a second end position of the switch body the inlet is closed and the outlet communicates with an aperture provided on the side of a measuring capillary.
8 Citations
2 Claims
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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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2. A measuring instrument according to claim 1, wherein each of said first and second bearing bores are conical in shape, said lateral aperture of said measuring capillary tube and said electrolyte outlet duct terminating in said first conical bearing bore, said electrolyte inlet duct terminating in said second conical-bearing bore, said switch member of said three-way valve being a glass flask having a first tapered end portion ground into the said first conical-bearing bore, said outlet port of said switch member terminating on the outer surface of said first end portion of said switch member, said switch member having a second tapered end portion which is ground into said second conical bearing bore, and said intake port of said switch member terminating on the outer surface of the said second conical end portion of said switch member.
Specification