Peripheral blood flow evaluating apparatus

Details Peripheral blood flow evaluating apparatus Peripheral blood flow evaluating apparatus

1994-03-28

1996-02-13

Sykes, Angela D.

Surgery

Truss

Pad

128665, 128666, 128689, 356 41, A61B 500

Patent

active

054905060

ABSTRACT:
An apparatus for evaluating a peripheral blood flow of a living subject, including a reflection-type pulse wave detecting device including two pairs of light-emitting and light-receiving elements provided such that a distance between the light-emitting and light-receiving elements of one pair is different from that of the other pair; and a determining device for determining an attenuation coefficient of the light beam emitted by the light-emitting element of each pair, based on (a) an intensity of the light beam which is emitted by the light-emitting element of each pair and (b) an intensity of the light which has been emitted from the light-emitting element of each pair, reflected from skin of the subject, and subsequently received by the light-receiving element of each pair. The apparatus further includes an evaluating device for evaluating peripheral blood flow of the subject, based on a ratio of the attenuation coefficient of the light beam emitted by the light-emitting element of one pair to the attenuation coefficient of the light beam emitted by the light-emitting element of the other pair, and/or, a display which displays a change of the ratio of the attenuation coefficient of the light beam emitted by the light-emitting element of one pair to the attenuation coefficient of the light beam emitted by the light-emitting element of the other pair.

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