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Non-invasive sensing of a physical parameter

  • US 6,292,680 B1
  • Filed: 02/16/2000
  • Issued: 09/18/2001
  • Est. Priority Date: 05/21/1997
  • Status: Expired due to Term
First Claim
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1. A method for sensing a physical parameter within the body of a patient, comprising:

  • associating a first magnet with a tissue substrate within the body of the patient, wherein the first magnet generates a first magnetic field;

    positioning a second magnet at an initial orientation with, and in close proximity to, the first magnet such that a change in the physical parameter alters the initial orientation between the first magnet and second magnet, wherein the second magnet generates a second magnetic field and the initial orientation is such that the first and second magnets are selectively oriented in alignment such that the first and second magnetic fields combine additively or in inverse alignment such that the first and second magnetic fields are substantially canceled by each other, the sum of the first and second magnetic fields yields an initial combined magnetic field;

    measuring the initial combined magnetic field; and

    monitoring the combined magnetic field over a period of time to sense a change in the physical parameter.

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