Storage in a pacemaker memory
First Claim
1. In an implantable pacemaker having means for sensing a cardiac signal, a system for storing a representation of said signal from which the signal subsequently may be reconstructed comprising means for monitoring said signal and determining each time at which the signal has changed by at least a threshold value since the preceding time at which the signal similarly changed, memory means, and means for storing in said memory means data indicative of the intervals between successive times at which said signal changed by at least said threshold value.
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Accused Products
Abstract
An implantable pacemaker which stores in memory the representation of an ECG signal by compressing the data. Whenever the input signal changes by a threshold amount from the last time data was recorded, a representation of the time interval which has elapsed is recorded. In a maximimally efficient system, the only information which must be stored are the successive elapsed times, along with indications of when the input signal changes slope.
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Citations
10 Claims
- 1. In an implantable pacemaker having means for sensing a cardiac signal, a system for storing a representation of said signal from which the signal subsequently may be reconstructed comprising means for monitoring said signal and determining each time at which the signal has changed by at least a threshold value since the preceding time at which the signal similarly changed, memory means, and means for storing in said memory means data indicative of the intervals between successive times at which said signal changed by at least said threshold value.
- 6. A method for storing in an implantable pacemaker a representation of a sensed cardiac signal from which the signal subsequently may be reconstructed comprising the steps of monitoring said signal and determining each time at which the signal has changed by at least a threshold value since the preceding time at which the signal similarly changed, and storing in a memory data indicative of the intervals between successive times at which said signal changed by at least said threshold value.
Specification