Multi-purpose transducer for transcutaneous blood measurements
First Claim
1. An improved blood-gas concentration transducer of the type employed for the transcutaneous measurement of blood-gas concentration and blood flow rate and comprised of reference and measuring electrodes and having a face which is laid against the tissue of interest for transcutaneous measurement, the improvement comprising light-emitting means operative for emitting light from said face for incidence onto the tissue against which said face of the transducer is laid, and photodetector means operative for receiving light transmitted in the direction towards said face of the transducer from the tissue against which said face is laid.
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Abstract
A multi-purpose polarographic oxygen-concentration transducer of the transcutaneous-measurement type, a face of it being laid against the tissue of interest, is able to generate signals beyond those indicating mere total oxygen concentration, and can additionally generate signals indicating concentration of oxygen chemically bound to blood hemoglobin, as well as also indicating pulse rate and pulse waveform, blood flow rate through the capillary network of such tissue, the elastic behavior of the capillaries, and the flow rate of blood through such tissue exclusive of that flowing through the capillary network. The transducer is thermostatically temperature-controlled and emits light onto the tissue against which it is laid and detects the light received back by reflection and/or by transmission of such light into and out of the tissue against which the transducer is laid.
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12 Claims
- 1. An improved blood-gas concentration transducer of the type employed for the transcutaneous measurement of blood-gas concentration and blood flow rate and comprised of reference and measuring electrodes and having a face which is laid against the tissue of interest for transcutaneous measurement, the improvement comprising light-emitting means operative for emitting light from said face for incidence onto the tissue against which said face of the transducer is laid, and photodetector means operative for receiving light transmitted in the direction towards said face of the transducer from the tissue against which said face is laid.
Specification