Ventricular defibrillation by coordination of shocks with sensed coarse VF complexes
First Claim
Patent Images
1. A method of treating ventricular fibrillation, comprising the steps of:
- a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation;
b) detecting in the monitored signal, the occurrence of coarse VF complexes;
c) analyzing coarse VF to determine upslope; and
d) delivering a DF shock during the upslope portion of a complex.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and system for ventricular defibrillation by coordinating the delivery of defibrillation shocks with sensed ventricular fibrillation complexes in a way which improves the probability of success of the defibrillation shock. Ventricular electrical activity is monitored during VF to detect coarse VF complexes. The defibrillation shock is delivered in coordination with the occurrence of coarse VF complexes, and specifically to occur on the upslope portion thereof, for optimal probability of success. Preferably, DF shock is delivered on the nth occurring coarse VF complex, wherein n is equal to or greater than 2 and less than or equal to about 9.
43 Citations
22 Claims
-
1. A method of treating ventricular fibrillation, comprising the steps of:
-
a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation; b) detecting in the monitored signal, the occurrence of coarse VF complexes; c) analyzing coarse VF to determine upslope; and d) delivering a DF shock during the upslope portion of a complex. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of treating ventricular fibrillation, comprising the steps of:
-
a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation; b) detecting and counting the occurrence of coarse VF complexes; and c) delivering a DF shock during the nth counted complex, where n is a number greater than or equal to 2 and less than or equal to about 9. - View Dependent Claims (7, 8, 9)
-
-
10. A method of treating ventricular fibrillation, comprising the steps of:
-
a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation; b) detecting the occurrence of coarse VF complexes; c) analyzing coarse VF complexes to determine upslope; and d) delivering a DF shock during the upslope of the nth counted complex, where n is a number greater than or equal to 2 and less than or equal to about 9. - View Dependent Claims (11, 12, 13, 14, 19)
-
-
15. A method of determining when to deliver a DF shock to a heart in ventricular fibrillation, comprising the steps of:
-
a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation; b) detecting the occurrence of coarse VF complexes as intervals of increase of the absolute value of the monitored signal; and c) selecting the time for DF shock delivery based on when the absolute value of the monitored VF signal reaches a predetermined value during a period of increasing rate.
-
-
16. A method of determining when to deliver a DF shock to a heart in ventricular fibrillation, comprising the steps of:
-
a) monitoring a signal representative of ventricular electrical activity during a period of ventricular fibrillation; b) measuring the amplitude of the monitored signal; c) determining the rate of change of the amplitude of the monitored signal; and d) selecting the time for DF shock delivery based on the amplitude of the monitored signal, a predetermined value during fibrillation, and whether the rate of change of the amplitude is positive. - View Dependent Claims (17)
-
-
18. A method of treating ventricular fibrillation, comprising the steps of:
-
a) monitoring a heart signal representative of ventricular electrical activity; b) detecting the presence of ventricular fibrillation c) during VF, detecting the occurrence of coarse VF complexes by measuring the monitored signal; and d) for the nth coarse VF complex, where n is greater than or equal to 2 and less than or equal to 9, delivering a coordinated DF shock based on the a predetermined value for the amplitude of the monitored signal, and whether the amplitude has a positive the rate of change.
-
-
20. A defibrillator, comprising:
-
a lead system for placement in electrical contact with the ventricle of the heart; a sensing system, attached to the lead system for monitoring ventricular electrical activity, which detects the presence of VF, and during VF to detect coarse VF complexes; a DF control system for controlling delivery of DF shocks through the lead system to the ventricle, the control system responsive to the sensing system to deliver a DF shock when the sensed VF complex increases to a predetermined value with a positive rate of change. - View Dependent Claims (21, 22)
-
Specification