Posture sensor
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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Abstract
A system and method determines the posture of a body. The system is first calibrated by attaching it to, or implanted it into, a body, placing the body in particular postures, and generating spectral signatures for each of those postures. Thereafter, the system generates spectral signatures for particular instants in time, correlates these instant signatures with the stored signatures, from which the posture of the body at that instant in time is determined.
25 Citations
28 Claims
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1. A system comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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detecting a time domain acceleration signal representative of physiologic movement of a body; transforming the time domain acceleration signal into a frequency domain acceleration spectrum; and comparing the frequency domain acceleration spectrum with stored spectral signatures to obtain posture information about the body, each stored spectral signature representative of a specified posture, wherein each of the spectral signatures includes frequency domain acceleration information resulting from body motion, cardiac motion, and respiratory motion while the body is in the specified posture, wherein comparing includes comparing the frequency domain acceleration spectrum with each of the stored spectral signatures to determine which stored spectral signature best correlates with the frequency domain acceleration spectrum to determine a posture of the body. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An implantable cardiac function management device comprising:
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an accelerometer, providing a time domain acceleration signal of a living body; a controller circuit, coupled to the accelerometer, comprising a time-domain-to-frequency-domain transform module coupled to said accelerometer; and a memory circuit, coupled to the transform module, the memory comprising; first spectral signatures each 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, including at least one of a standing posture, a sitting posture, a lying posture, and an ambulatory posture; and at least one second spectral signature of physiologic movement including information about an instant posture of the body, and wherein the controller circuit is operable to correlate the second spectral signature with the first spectral signatures to determine which stored first spectral signature best correlates with the second spectral signature to determine the instant posture of the body. - View Dependent Claims (25, 26)
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27. A system comprising:
a medical device, the medical device comprising; a motion sensing device configured to produce a time domain motion signal; a controller circuit comprising a time-domain-to-frequency-domain transform module coupled to the motion sensing device, wherein the transform module is configured to transform the time domain motion signal into a frequency domain motion 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, and wherein the controller circuit is configured to compare the frequency domain motion 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. - View Dependent Claims (28)
Specification