Process and arrangement for determining the perfusion factor of a gas in a sample
US4114602A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1976 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Jul 12, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1491
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A process and an arrangement for determining the perfusion factor of a gas in a sample, particularly of oxygen dissolved in blood flowing through biological tissue, includes measuring the amount of gas diffused from the sample by means of a polarographic cell which comprises a reference electrode having a heat conductive surface which is adapted to be placed in heat-transmitting relationship over a portion of the sample, and a sensor electrode in electrolytic contact with the reference electrode so as to generate a signal indicative of the amount of gas being diffused from the sample portion. A heating unit comprising a high frequency generator to establish a high frequency field in the sample is also provided for heating the sample diathermically to a desired temperature. The temperature of the sample is thereupon detected by a temperature sensor attached to the heat conducting surface, which is operative to generate a control signal for the heating unit which is operative to maintain the temperature of the reference electrode at a substantially constant value. The amount of heat furnished by the heating unit to the reference electrode which is equivalent to the flow of blood stre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.