EXTERNAL DEFIBRILLATOR
2 Assignments
0 Petitions
Accused Products
Abstract
An external defibrillator includes patient electrodes (20) for obtaining the patient'"'"'s electrocardiogram (ECG) and for applying a shock to the patient. A microprocessor (24) analyses the patient'"'"'s ECU using a diagnostic algorithm to detect if the patient'"'"'s heart is in a shockable rhythm, and shock delivery circuitry (10) is enabled when a shockable rhythm is detected by the diagnostic algorithm. The patient electrodes also allow obtaining a signal (Z) which is a measure of the patient'"'"'s transthoracic impedance and the microprocessor is responsive to Z to detect conditions likely to cause the diagnostic algorithm to generate a false detection of a shockable rhythm. If such detection is made, the microprocessor prevents detection of a shockable rhythm by the diagnostic algorithm, at least for a period of time.
1 Citation
23 Claims
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1-5. -5. (canceled)
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6. A defibrillator comprising:
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electrodes; a processor; and a circuit connecting the processor and the electrodes, wherein, when the electrodes are in contact with a patient, the processor performs operations comprising; receiving a signal from the patient; determining, from the signal, a measure of transthoracic impedance of the patient; determining, based on the measure of transthoracic impedance, whether an interference condition is present; and when the interference condition is present, performing one of;
inhibiting the circuit from delivering a shock to the patient and preventing a diagnostic algorithm from detecting a shockable rhythm. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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receiving a signal from a patient via electrodes; determining, from the signal and via a processor, a measure of transthoracic impedance of the patient; determining, based on the measure of transthoracic impedance, whether an interference condition is present; and when the interference condition is present performing one of;
inhibiting the circuit from delivering a shock to the patient and preventing a diagnostic algorithm from detecting a shockable rhythm. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification