Device for varying the threshold detection level of a sensor

Details Device for varying the threshold detection level of a sensor Device for varying the threshold detection level of a sensor

1996-07-01

1997-09-23

Jastrzab, Jeffrey R.

Surgery

Truss

Pad

128708, 128672, 128687, 128716, 128736, 607 17, A61B 50402

Patent

active

056693923

ABSTRACT:
In a method and apparatus for automatically adjusting the threshold detection level of a detector unit for detecting physiological events, e.g. heart contractions, a cardiac signal is sensed and sampled, the samples of the cardiac signal are stored in a memory. A timer starts the sampling and stops the sampling after a predetermined time. An analysis unit analyzes the stored cardiac signal samples to generate a first set of values which represent physiological events, such as average peak signal value, the average maximum signal slope or an integrated signal value. The analysis unit calculates at least one derived parameter from the whole of the first set of values and automatically determines a new threshold detection level for the sensor as a function of this at least one derived parameter. For this purpose the analysis unit (8) compares the new threshold detection level with the stored periodic physiological signal to determine how many physiological events would have been detected if the new threshold level had been in use when the sampling was taking place, and the analysis unit changes the new threshold detection level if the number of physiological events which would have been detected differs by more than a programmable number from the estimated number of physiological events.

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patent: 5423870 (1995-06-01), Olive et al.
patent: 5448997 (1995-09-01), Kruse et al.

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