Surgery – Truss – Pad
Patent
1982-12-21
1985-03-26
Kamm, William E.
Surgery
Truss
Pad
128419D, A61B 504
Patent
active
045066779
ABSTRACT:
An indicating device is used to record the waveshape of the patient current of a defibrillator as a composite with an ECG recording such that the current waveshape is shown clearly and can be evaluated. A coupling device is provided for deriving an electrical signal corresponding to the defibrillator current. The electrical signal is written at a high frequency into a memory for storage. A time extension of the stored signal is achieved subsequently by reading the stored signal from the memory with a low reading frequency. The ratio of the high and low frequencies is 100 to 1. The time extended signal is selectively applied for recording. During the duration of the recording of the defibrillator current waveshape, a switch control circuit interrupts the recording of the electrocardiogram (ECG) and substitutes the extended signal. A timing and delay circuit is used to synchronize the memory operation and the ECG interruption with the defibrillator operation.
REFERENCES:
patent: 3221334 (1965-11-01), Jones, Jr.
patent: 3897774 (1975-08-01), Burdick et al.
patent: 4109243 (1978-08-01), Day et al.
patent: 4236523 (1980-12-01), Gruenenwald
patent: 4316472 (1982-02-01), Mirowski et al.
patent: 4328808 (1982-05-01), Charbonnier et al.
Halista Mitchell J.
Honeywell Inc.
Joike Trevor B.
Kamm William E.
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