Cardiac stimulator with data converter for cardiac signal

Details Cardiac stimulator with data converter for cardiac signal Cardiac stimulator with data converter for cardiac signal

1993-06-04

1994-10-11

Manuel, George

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

36441306, A61N 1362

Patent

active

053543157

ABSTRACT:
An implantable cardiac stimulator with an analog-to-digital converter which comprises timing means for defining measurement cycles. During successive cycles, the value of a cardiac waveform is sampled. The difference between sampled values in two different measurement cycles produces a value whose probability is predicted. A digital code is assigned to each expected difference value such that difference values with a high expected probability have a shorter code and values with a low probability have a longer code. Means are provided for assigning a digital code based on the determined difference, the digital code being of predetermined variable size, the size of the code being proportional to the predicted probability of occurrence of a particular difference. The variability in code length permits the resulting digital representation of the waveform to be compressed and the energy required for conversion to be reduced. Different codes can be assigned to a detected difference depending on the type of waveform (normal, tachycardia, fibrillation) which is being detected.

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John Proakis, Digital Communications, second ed., McGraw-Hill Book Co., 1989, pp. 79-86.
Gallager, Robert, Information Theory and Reliable Communication, John Wiley & Sons, 1968, pp. 43-49.

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