| 摘要 |
A heart stimulator comprises a pulse generator devised for producing stimulation pulses of varying amplitudes and varying durations for stimulating the heart of a patient (16), and an evoked response detector. The evoked response detector includes measuring and memory means (C3, S3, OP1, OP2, 14) for measuring the charge Q delivered by a stimulation pulse. The measuring and memory means are adapted for determining and storing as a reference voltage a charged voltage value UD related to the measured charge. Monitoring means (C2, OP3, S4, R2, OP4, C4, S5) are provided for monitoring the combined polarization and possible evoked response signal uA(t) picked up from the patient's heart after the delivery of a stimulation pulse and deriving a corresponding monitoring voltage value UB. Comparison means (OP5) are provided for comparing the monitoring voltage value with said charged voltage value for determining, from the result of the comparison, the presence or absence of an evoked response. <IMAGE> |
