| 摘要 |
A demand pacer has a local memory element (13), programmable from a remote source, which detects whether or not the hysteresis rate adjustment is to be employed. When hysteresis is disabled, the pacer operates in the normal demand mode, at a rate optionally selected by the same memory. In the hysteresis mode, a flip-flop (7) controls gating means (3, 4), ultimately operable at conventional or hysteresis rates, ultimately for controlling the output amplifier. An input amplifier senses natural heart beat signals, and enables a gating means (15), which has been conditioned for hysteresis mode operation, to reset the flip-flop and in turn the output controlling gates.
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