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External patient reference sensors

  • US 5,810,735 A
  • Filed: 05/01/1997
  • Issued: 09/22/1998
  • Est. Priority Date: 02/27/1995
  • Status: Expired due to Term
First Claim
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1. A system for determining the absolute value of an implanted medical device sensor measurement where said implanted sensor measurement values are subject to significant biasing by external forces in the patient'"'"'s environment, said system comprising:

  • a systemwide program for pairing the storage of data sets of sensed values and times between an implanted sensor and measurement device and an external sensor and measurement device and enabling the later comparison of the two data sets, said program having portions thereof stored in memory of system devices for execution therein, said system devices comprising;

    a) an implanted sensor and measurement device having a memory for storing sensor data and a portion of said program for execution in said implanted device, a clock, a sensor for generating measurement values and a processor, so arranged and disposed that the memory holds representations of sensor measurement values as coordinated by the processor, said coordinating the enabling of the sensor to generate and the memory to hold each new measurement value at appropriate times in accord with a predetermined processor run and clock driven program,b) an external sensor and measurement device having a memory for storing sensor data and a portion of said program for execution in said external device, a clock, a sensor for generating measurement values and a processor, so arranged and disposed that the memory holds representations of sensor measurement values as coordinated by the processor, said processor coordinating the enabling of the sensor to generate and the memory to hold each new measurement value at appropriate times in accord with a predetermined processor run and clock driven program,c) a coordinating programmer apparatus also having a memory for storing a portion of said program for execution in said apparatus, for initiating timing of paired programs for storing data in said implanted and external devices by way of two communications channels establishable between said programmer and said external device and between said programmer and said implanted device.

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