Detection of electrode/patient motion and fast restore limits

Details Detection of electrode/patient motion and fast restore limits Detection of electrode/patient motion and fast restore limits

A - Human Necessities

61

N

A61N 1/39 (2006.01) A61N 1/37 (2006.01) G06F 15/42 (1990.01)

Patent

CA 2085627

DETECTION OF ELECTRODE/PATIENT MOTION AND FAST RESTORE LIMITS Abstract of the Disclosure A defibrillator/monitor (10) is disclosed employing a motion detection circuit 18 and control and processing circuit (20) that cooperatively detect motion at a patient-electrode interface. In that regard, an impedance measurement circuit (24) produces an output indicative of the impedance of the interface. This output is then processed by a number of filter elements before being analyzed by a motion detection routine (52). The motion detection routine includes subroutines (62 and 64) that compare the impedance against distinct upper and lower limits and then monitor the time at which the signal is above and below the limits. Basically, motion is indicated if the signal undergoes relatively large variations for a short time, or smaller variations for a longer time. A third motion clear subroutine (66) is used to determine when motion is no longer detected. Finally, a similar scheme (102) is employed to quickly restore the various filter elements after saturation.

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