Microprobe for monitoring biophysical phenomena associated with

Details Microprobe for monitoring biophysical phenomena associated with Microprobe for monitoring biophysical phenomena associated with

1980-04-01

1982-08-17

Howell, Kyle L.

Surgery

Truss

Pad

324 58B, 324 585B, 343772, A61B 504

Patent

active

043444407

ABSTRACT:
A portable microprobe uses 10 gigahertz CW microwave radiation at a power level of less than 10 milliwatts for recording of a number of biophysical phenomena associated with the cardiac and neural activity of the life system. The microprobe consists of a Gunn diode feeding power into a short, insulated dielectric waveguide, the free end of which houses a point contact semiconductor diode isolated by a metal shield from the incident beam. The wave guide concentrates and delivers a pencil shaped beam into the tissue of interest and the back-scattered radiation is modulated and detected by the diode. The detected signal is filtered, amplified and recorded to reflect on-going biological activity. The receiver electronics is housed in a small self-contained package and has its output connected through a flexible attachment to two ear tubes which enable continuous monitoring of the audio response through an electrical and audio converter indicative of the on-going biological activity. By scanning step wise across the chest, the microprobe allows localization of many details of cardiac activity. The microprobe can also be used to monitor activities of the brain and the spinal cord.

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