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Holter function data encoder for implantable device

  • US 5,052,399 A
  • Filed: 09/20/1990
  • Issued: 10/01/1991
  • Est. Priority Date: 09/20/1990
  • Status: Expired due to Term
First Claim
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1. A method for encoding/decoding cardiac data for storage in a memory of a body implantable device, the method comprising the steps of:

  • providing a memory having addresses and storage cells each having a corresponding address;

    detecting the cardiac electrical activity of the heart;

    determining the time interval of successive cardiac cycles from the detected electrical activity of the heart;

    encoding said cardiac data comprising the steps of;

    computing the time difference between the time intervals of successive cardiac cycles;

    determining if the time difference between the time intervals of successive cardiac cycles falls within a predetermined range;

    storing the value of the time difference in a particular storage cell of said memory at a corresponding particular address if said time difference falls within said predetermined range and setting the value of the stored time difference to be negative; and

    storing the time interval in two consecutive storage cells in said memory if said time difference does not fall within said predetermined range;

    decoding the stored cardiac data comprising the steps of;

    retrieving data in a storage cell at an initial address in said memory;

    determining if the value of the data at said initial address is greater than zero;

    retrieving said time interval at consecutive storage cells in said memory if said value of the data at said initial address is greater than zero; and

    retrieving said time difference if said value of data at said initial address is not greater than zero and computing said time interval by adding a previously retrieved time interval to the time difference.

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