Perfusion ratio detector

Details Perfusion ratio detector Perfusion ratio detector

1981-03-30

1984-01-10

Howell, Kyle L.

Surgery

Truss

Pad

A61B 1000

Patent

active

044248148

ABSTRACT:
The detector provides an effective means of non-invasively monitoring the perfusion of blood by external cardiac massage during a cardiac arrest. A Doppler probe is adhesively placed on the patient's skin, preferably to sense the carotid pulse which has been found as the most significant indicator of sufficient cerebral perfusion. The electronic part of the detector measures both the period of blood flow (T.sub.f), and the period of the external cardiac massage (ECM) cycle (T.sub.ecm). The electronic components comprise a flow detector such as a Doppler sensor and Schmidtt trigger, a rate converter such as a frequency to voltage converter feeding a voltage controlled oscillator, and a counter and display. The preferred display is a series of ten light indicators for demarcating perfusion ratio in 10% increments.

REFERENCES:
patent: 3796213 (1974-03-01), Stephens
patent: 3980075 (1976-09-01), Heule
patent: 4094308 (1978-06-01), Cormier
patent: 4109643 (1978-08-01), Bond et al.
patent: 4147059 (1979-04-01), Fathauer
patent: 4167331 (1979-09-01), Nielsen

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