Heart rate detector

Details Heart rate detector Heart rate detector

1981-05-15

1983-07-19

Kamm, William E.

Surgery

Truss

Pad

128419D, A61B 504

Patent

active

043938779

ABSTRACT:
A heart rate detector apparatus, particularly for use in an implantable defibrillator, is disclosed. The heart rate detector apparatus includes two distinct detector circuits each responsive to ECG waveforms of different characteristics. One of the detector circuits is responsive to ECG waves having slew rates above a predetermined threshold. The other detector circuit is responsive to ECG waves having lower slew rates, such as ECG waves of more sinusoidal shape. A coupling circuit automatically couples one of the two detector circuits to an output circuit, such as a heart rate comparator. In a specific embodiment, the heart rate comparator determines the heart rate, compares the heart rate with a predetermined rate, and, if the heart rate exceeds the predetermined rate for a predetermined time period, provides an output signal. The output signal may be used to enable a defibrillating circuit to deliver a defibrillating shock to the patient.

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Senczuk, "Description of a 15 Channel Analog Selector", IEEE Trans. Biomed. Eng., vol. BME 24, #2, Mar. 1977.

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