A - Human Necessities – 61 – N
Patent
A - Human Necessities
61
N
326/1.2
A61N 1/36 (2006.01)
Patent
CA 1058295
ABSTRACT OF THE DISCLOSURE A demand cardiac pacer of the type having a resettable pulse gene- rator and electrode means adapted to be connected to the heart for sensing heart activity is disclosed. The pacer is provided with interference dis- crimination circuitry including a rectifier section responsive to the repeti- tion rate and amplitude of the signals sensed by the electrodes for establi- shing a reference level representative of sensed extraneous repetitive noise and a second level representative of sensed heart activity. A detector section of the interference discrimination cirrcuitry responds to a difference between the reference level and second level to generate a signal indicative of the sensing of heart activity when that difference exceeds a predetermined value. In a preferred embodiment, the rectifier and detector sections of the inter- ference discrimination circuitry include differential amplifiers, the rec- tifying differential amplifier acting to control the charge on a capacitor with the capacitor charge establishing both the reference and second levels. The signal indicating the sensing of heart activity triggers a reset signal gene- rator which is provided with a refractory period to limit the repetition rate of the reset signals.
238416
Adams John M.
Gobeli David H.
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