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Posture sensor

  • US 7,848,811 B2
  • Filed: 12/21/2005
  • Issued: 12/07/2010
  • Est. Priority Date: 12/21/2005
  • Status: Expired due to Fees
First Claim
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1. A system comprising:

  • a medical device, the medical device comprising;

    an accelerometer configured to produce a time domain acceleration signal;

    a controller circuit comprising a time-domain-to-frequency-domain transform module coupled to the accelerometer, wherein the transform module is configured to transform the time domain acceleration signal into a frequency domain acceleration spectrum; and

    a memory circuit, coupled to the transform module, the memory comprising first spectral signatures, each first spectral signature representative of a specified posture, wherein each of the first spectral signatures includes frequency domain acceleration information resulting from body motion, cardiac motion, and respiratory motion while the body is in the specified posture, andwherein the controller circuit is configured to compare the frequency domain acceleration spectrum with each of the first spectral signatures to determine which stored first spectral signature best correlates with the frequency domain acceleration spectrum to determine a posture of the body.

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