A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 5/11 (2006.01) A61B 5/113 (2006.01) G01P 13/00 (2006.01)
Patent
CA 2125162
2125162 9311553 PCTABS00022 A fiber optic body motion monitor in which light (1) is transmitted through an optical fiber waveguide physically coupled to a body being monitored, and modal noise at the output of the optical fiber waveguide (2) is applied to a photodetector (5), filtered, rectified and analyzed to detect breathing and heartbeats. Detection of breathing is performed by low-pass filtering the rectified and filtered signal, and adaptive thresholding of the low-pass filtered signal. A similar but separate technique is used to detect heartbeats. In one embodiment, reliability of detection is enhanced by reducing the number of speckles of light applied to the photodetector to approximately 50 %, thereby to maximize modal noise current. In another embodiment the photodetector (5) has two halves separately illuminated by approximately two-thirds of the light from the optical fiber waveguide (2). Outputs of the photodetector (5) halves are applied to the positive and negative inputs of an operational amplifier (61), whereby common mode noise is eliminated and modal noise current and therefore sensitivity of modal noise detection increased.
Nafarrate Antonio B.
Rawson Eric G.
Alamed Corporation
Swabey Ogilvy Renault
LandOfFree
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