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Electrocardiograph Pulse Separator

IP.com Disclosure Number: IPCOM000086182D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Dimmick, RF: AUTHOR [+3]

Abstract

In most electrocardiographs (EKG) the indication of the basic heart beat pulse, the R-wave, is so intermixed with extraneous signals arising from motion or other muscular signals, that satisfactory operations are possible only with resting or unconscious patients.

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Electrocardiograph Pulse Separator

In most electrocardiographs (EKG) the indication of the basic heart beat pulse, the R-wave, is so intermixed with extraneous signals arising from motion or other muscular signals, that satisfactory operations are possible only with resting or unconscious patients.

In the circuit diagrammed, the R-wave can be separated from other signals in the output of the EKG and can be signalled even though the patient is active at the time. As shown, shielded leads 1 and 2 are connected to the patient at opposite parts of the body and enter into a control and isolating unit 3. This unit 3 contains a high resistance in each lead to prevent any shock danger to the patient and an amplifier for each lead 1 or 2.

A buffer amplifier 4 receives the signal outputs of the amplifiers in control 3 and provides an output corresponding to the differences in the two signals. The two output signals of control 3 are also summed and powered in amplifier 4 to be fed back through capacitor 6 to the shields for leads 1 and 2. This feedback will aid in reducing common-mode signals due to motion or muscle activity.

The differential output signal from amplifier 4 is further amplified in an amplifier 7 and passed to a bandpass filter 8. This filter has a center frequency of 24 Hz with a 16 Hz wide band to eliminate all frequency components outside the range of 16 to 32 Hz, which is the frequency content of the R-wave to be detected. The filtered output from filter...