Posture detector calibration and use
First Claim
1. A method for operating a medical device to detect posture, comprising:
- measuring outputs of one or more sensors disposed in relation to a patient'"'"'s body while the patient assumes a plurality of body postures, the one or more sensors responsive to a gravitational field;
forming a transfer matrix using a processor, the transfer matrix having coefficients, each coefficient being proportional to one of the measured outputsto define a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient'"'"'s body different from the coordinate system of the one or more sensors; and
determining, using the processor, a posture of the patient'"'"'s body using the body coordinate system as a reference coordinate system;
wherein at least one of the measuring, forming, and determining is carried out by the medical device.
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Accused Products
Abstract
Calibrating a posture detector for a patient'"'"'s body involves measuring outputs of one or more sensors disposed in relation to the patient'"'"'s body while the patient assumes a plurality of positions. A transfer matrix is formed having coefficients corresponding to the measured outputs. The transfer matrix defines a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient'"'"'s body. The body coordinate system is used as a reference coordinate system for posture detection. Posture, including tilt and/or tilt angle, may be determined based on first and second rotational angles defined in relation to the body coordinate system.
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Citations
42 Claims
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1. A method for operating a medical device to detect posture, comprising:
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measuring outputs of one or more sensors disposed in relation to a patient'"'"'s body while the patient assumes a plurality of body postures, the one or more sensors responsive to a gravitational field; forming a transfer matrix using a processor, the transfer matrix having coefficients, each coefficient being proportional to one of the measured outputs to define a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient'"'"'s body different from the coordinate system of the one or more sensors; and determining, using the processor, a posture of the patient'"'"'s body using the body coordinate system as a reference coordinate system; wherein at least one of the measuring, forming, and determining is carried out by the medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A posture detector, comprising:
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one or more sensors responsive to a gravitational field, each sensor disposed in relation to a patient'"'"'s body and configured to output a signal based on an orientation of the patient; calibration circuitry coupled to the one or more sensors and configured to form a transfer matrix having coefficients, each coefficient being proportional to one of the sensor outputs, the transfer matrix defining a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient'"'"'s body different from the coordinate system of the one or more sensors; and a posture processor coupled to the one or more sensors and the calibration circuitry and configured to determine a posture of the patient'"'"'s body using the body coordinate system as a reference coordinate system. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A posture sensing system, comprising:
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means for measuring outputs of one or more sensors responsive to a gravitational field disposed in relation to a patient'"'"'s body while the patient assumes a plurality of body postures; means for forming a transfer matrix having coefficients, each coefficient being proportional to one of the measured outputs, the transfer matrix defining a relationship between a coordinate system of the one or more sensors and a coordinate system of the patient'"'"'s body different from the coordinate system of the one or more sensors; and means for determining a posture of the patient'"'"'s body using the body coordinate system as a reference coordinate system. - View Dependent Claims (22)
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23. A method for operating a medical device to detect posture, comprising:
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measuring outputs from a plurality of accelerometers disposed in the medical device with relation to a patient'"'"'s body, each accelerometer providing its output based on the accelerometer'"'"'s orientation with respect to gravity; determining, using a processor, first and second rotational angles associated with posture using the measured accelerometer outputs; comparing, using the processor, the first and the second rotational angles to threshold regions on a spherical surface; and determining, using the processor, the posture based on the comparisons; wherein at least one of the determining first and second rotational angles, comparing, and determining the posture is carried out by the medical device. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A posture detector, comprising:
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one or more sensors responsive to a gravitational field disposed in relation to a patient'"'"'s body, each sensor configured to output a signal based on an orientation of the patient; and a posture processor coupled to the one or more sensors and configured to determine first and second rotational angles associated with the posture from the sensor outputs, to compare the first and second rotational angles to threshold regions on a spherical surface, and to determine the posture based on the comparisons. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A posture sensing system, comprising:
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means for measuring outputs from a plurality of accelerometers disposed in a medical device with relation to a patient'"'"'s body, each accelerometer providing its output based on the accelerometer'"'"'s orientation with respect to gravity; means for determining first and second rotational angles associated with posture using the measured accelerometer outputs; means for comparing the first and the second rotational angles to threshold regions on a spherical surface; and means for determining the posture based on the comparisons. - View Dependent Claims (38, 39, 40, 41, 42)
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Specification