ATTACHMENT FOR THE MICROANALYSIS OF BLOOD GASES

• US 3,639,830 A
• Filed: 04/23/1969
• Issued: 02/01/1972
• Est. Priority Date: 04/30/1968
• Status: Expired due to Term

• Current Assignee: Karl Harnoncourt
• Original Assignee: Karl Harnoncourt
• Inventors: Harnoncourt, Karl
• Primary Examiner(s): Lynch, Michael J.
• Application Number:
  US04/818,560
• Time in Patent Office: 1,014 Days
• Field of Search: 324/30,29 204/1.1,195 23/23B,253
• US Class Current: 324/450
• CPC Class Codes: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3
• CPC Class Codes: G01N 7/14 by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference determining urea G01N33/48742

Abstract

An attachment for the cleaning and drying of measuring capillary tubes for the microanalysis of blood gases having a measuring vessel containing the capillary tube to receive a blood test sample and a measuring electrode arrangement in contact with the test sample and having a scavenging duct connectable to one end of the tube.

Claims

1. A measuring instrument for the microanalysis of blood gases comprising a measuring vessel having a measuring capillary tube capable of receiving a blood test sample mounted therein, said vessel having a plurality of receiving bores extending in transverse relation to said measuring capillary tube and terminating in said measuring capillary tube, a plurality of measuring electrodes, each of said electrodes located in one of said receiving bores respectively and in contact with said blood test sample in said measuring capillary tube, a device for cleansing and drying said measuring capillary tube comprising a reservoir containing a cleansing liquid, a suction pump, a switchover device consisting of a stationary base having two control bores and a manually moveable switch member mounted on the base and moveable from a final rest position via an intermediate position into a final scavenging position, a control groove on said switch member interconnecting said control bores in the intermediate and final scavenging positions of said switch member, a scavenging pipe attached to and moveable with said switch member, a scavenging line connecting one end of said scavenging pipe with said reservoir, the other end of said scavenging pipe being directly connected with one end of said measuring capillary tube in the said final scavenging position and separated from said measuring capillary tube in the remaining positions of said switch member, a suction pipe having two sections, the first section connecting the other end of said measuring capillary tube to one of said control bores, and the second section connecting the second control bore with said suction pump.

2. A measuring instrument according to claim 1 wherein said suction pipe is movable and is connected with said switch member of said switchover device, said first section of said suction pipe being connected to the said suction pump through both said control groove and said second section of said suction pipe in the final scavenging position and in the drying position of said switch member, said first section of said suction pipe being tightly connected with said measuring capillary tube opposite said scavenging pipe in the final scavenging position and the drying position but disconnected from said measuring capillary tube by reason of said control groove in the final rest position of said switchover device.

3. A measuring instrument according to claim 1, wherein the said switchover device is designed as a rotary slide valve having a stationary base comprising the aforesaid two control bores and a switch member rotatably mounted on said base, said switch member having a curved recess forming said control groove, said recess covering said two control bores and interconnecting the aforesaid two sections of said suction pipe in the final scavenging position and in the drying position of said switchover device.

4. A measuring instrument according to claim 2, wherein said switchover device is designed as a rotary slide valve having a stationary base with two control bores and a switch member rotatably mounted on said base, and having a curved recess forming said control groove, said recess covering the two control bores and connecting said suction pipe via said second section of said suction pipe with said suction pump in the final scavenging position and in the drying position of said switchover device.