Pulse responsive device

Details Pulse responsive device Pulse responsive device

A - Human Necessities

61

B

A61B 5/0245 (2006.01) A61B 5/00 (2006.01) A61B 5/024 (2006.01)

Patent

CA 2083721

2083721 9118550 PCTABS00008 A pulse responsive device, e.g. a pulse rate meter or pulse oximetry device comprises a light emitter (20) and a light sensor (21) for receiving light from the emitter after transmission through or reflection from body tissue, to give an electrical signal varying according to blood flow pulsations. A movement transducer gives an electrical signal representing body movements or vibrations but independent of blood flow pulsations: this transducer may comprise a light emitter (22) and sensor (23) responsive to a different wavelength from the elements (20, 21). The device compares the two electrical signals to cancel out the movement or vibration noise from the signal from the sensor (21).

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