A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.4
A61N 1/36 (2006.01) A61N 1/37 (2006.01) G01R 29/02 (2006.01)
Patent
CA 1140636
ABSTRACT OF THE DISCLOSURE A system is disclosed for accurately providing a signal or signals indicative of the relatively sharp leading edge and the relatively attenuated trailing edge of a pulse and in particular of a pulse applied by a heart pacemaker to a patient's heart. The system of this invention functions to distinctly detect each of the relatively fast rising leading edge and the relatively slow rising trailing edge, while preventing a premature detection of the trailing upon the attenuated or drooping portion of the pacing pulse therebetween. The patient's heart activity signals compris- ing the pacing pulses and with extraneous noise including the patient's QRS wave, 60 Hz noise, muscle artifacts, etc., are applied to a differentiator or wave shaping amplifier whose gain or transfer function is configured to reject signals having low frequency components, i.e., the noise signals mentioned above. The output of the differentiator is applied to a first input of a differential amplifier, while the aforementioned heart activity signals are applied to a second input; the differential amplifier circuit essen- tially subtracts the amplifier output from the heart activ- ity signals to remove the DC component from the output of the amplifier circuit. The differential amplifier output is applied to a first threshold circuit or leading edge detec- tor to provide an output signal indicative of the occurrence of the leading edge, if amplifier output is above a prede- termined amplitude, and to set a one shot circuit, which in turn provides a signal initiating the detection of the trailing edge. The output of the wave shaping amplifier is also applied via a limiter or amplifier to a second thresh- old circuit, which responds to signals above a predetermined threshold to provide a signal indicative of the occurrence of the trailing edge. Noting that the output of the wave- shaping amplifier is less for the trailing edge than the leading edge, the gain of the amplifier, as well as the time constant of the waveshaping amplifier and the threshold level of the second threshold detector is set to detect the trailing edge of the pacemaker pulse.
339116
Medtronic Inc.
Smart & Biggar
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