Biomedical subjects

R A Valsler

Publications and source records attributed to R A Valsler.

2 recordsLinked to original sources

PubMed1986

An infra-red fibre optic device for cardiac cycle timing and photoplethysmography.

In this work a simple fibre optic device using infra-red radiation is used to obtain information on the timing of the cardiac cycle and blood volume changes in the flow of blood in the body. The device is small, non-invasive and free from interference by surrounding electromagnetic fields enabling it to be used in the environment of such devices as NMR scanners.

Cardiography, Impedance↗

PubMed1985

Optical fibre plethysmograph.

We describe a method for obtaining blood volume information from the external jugular vein or carotid artery by means of an optical fibre transducer. The device may be used to obtain accurate predictions of the state of the cardiac cycle, thereby enabling a range of physiological measurements to be made. The transducer is entirely non-invasive and non-magnetic; it is extremely robust and is unaffected by the electrically and magnetically hostile environment created by an NMR scanner.

Biomedical Engineering↗