Indicating device for defibrillators
First Claim
1. An indicating device for a defibrillator, characterized by a coupling means for producing an electrical signal corresponding to a defibrillator current applied to a patient;
- a memory means for receiving and storing the electrical signal;
a memory operation control circuit means for writing the signal into the memory means and for reading the signal from the memory means to produce a time extension of the signal and a control circuit means for selectively applying the time extension of the signal to an indicating means and which, for the duration of an indication of the time extended signal, interrupts the display of an ECG of the patient on the indicating means.
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Accused Products
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.
14 Citations
9 Claims
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1. An indicating device for a defibrillator, characterized by a coupling means for producing an electrical signal corresponding to a defibrillator current applied to a patient;
- a memory means for receiving and storing the electrical signal;
a memory operation control circuit means for writing the signal into the memory means and for reading the signal from the memory means to produce a time extension of the signal and a control circuit means for selectively applying the time extension of the signal to an indicating means and which, for the duration of an indication of the time extended signal, interrupts the display of an ECG of the patient on the indicating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a memory means for receiving and storing the electrical signal;
Specification