Blood flow monitor apparatus

Details Blood flow monitor apparatus Blood flow monitor apparatus

1981-05-27

1983-11-15

Howell, Kyle L.

Surgery

Truss

Pad

A61B 502

Patent

active

044149808

ABSTRACT:
Blood flow monitor apparatus includes a transducer having a skin-engaging face from which first and second light guides respectively lead to a photodetector and light source, the second light guide forming an array surrounding the first at said face. There can be a plurality of second light guides leading to respective individual sources or, by bundling guides of fibre optic form, to a single source. In the latter case the source can be remotely connected by a fibre optic cable to a separate skin probe. Infra-red operation is preferred. The apparatus will also normally involve a visual display of, and an alarm responsive to attainment of a preset level for, at least one characteristic of the detector output. The first time differential is a characteristic of particular interest, and a presently preferred characteristic is the ratio between the maximum and minimum values of this differential.

REFERENCES:
patent: 3825342 (1974-07-01), Lubbers et al.
patent: 4086915 (1978-05-01), Kofsky et al.
patent: 4163447 (1979-08-01), Orr
patent: 4224948 (1980-09-01), Cramer et al.
patent: 4295470 (1981-10-01), Shaw et al.
Dimmick, R. F. et al., "Optical Plethysmograph" IBM Tech. Disclosure Bulletin, vol. #3, Aug. 1976, pp. 772-773.

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