Orientation of patient's position sensor using external field
First Claim
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1. A method for operating an implantable stimulation device, comprising:
- sensing data using a position sensor;
sensing an orientation using an external field sensor; and
resolving the data according to the vertical orientation to adjust orientation of the position sensor.
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Abstract
An implantable cardiac stimulation device is equipped with an accelerometer-based sensor to sense a patient'"'"'s movement and produce a vertical acceleration component indicative of a patient'"'"'s acceleration in a vertical direction. A vertical velocity component is computed from the vertical acceleration component. The device may be further equipped with a magnetic field sensor to sense the earth'"'"'s magnetic field as a way to obtain a true vertical orientation, against which the accelerometer-based sensor can be calibrated.
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Citations
23 Claims
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1. A method for operating an implantable stimulation device, comprising:
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sensing data using a position sensor;
sensing an orientation using an external field sensor; and
resolving the data according to the vertical orientation to adjust orientation of the position sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
increasing pacing rate if the patient is walking upstairs; and
decreasing pacing if the patient is walking downstairs.
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9. The method of claim 7, further comprising:
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invoking an orthostatic compensator to apply a prescribed pacing therapy if the patient is walking upstairs; and
invoking a MV response module to control pacing therapy.
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10. The method of claim 7, further comprising determining, based on the vertical acceleration parameter, whether the patient moves from a supine position to an upright position.
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11. The method of claim 10, further comprising:
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increasing pacing rate if the patient is walking upstairs;
applying a MV response therapy if the patient is walking downstairs; and
applying an orthostatic compensation therapy if the patient moves from the supine position to the upright position.
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12. One or more computer-readable media having computer-readable instructions thereon which, when executed by a programmable stimulation device, cause the stimulation device to execute the method of claim 1.
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13. A method for operating an implantable stimulation device, comprising:
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sensing an extemal magnetic field to produce orientation data; and
determining a patient'"'"'s positional status based at least in part on the orientation data. - View Dependent Claims (14, 15, 16, 17)
discerning a true vertical direction by ascertaining orientation coordinates based on the earth'"'"'s magnetic field.
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17. One or more computer-readable media having computer-readable instructions thereon which, when executed by a programmable stimulation device, cause the stimulation device to execute the method of claim 13.
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18. A cardiac stimulation device comprising:
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a position sensor to sense a patient'"'"'s position relative to at least one axis;
a magnetic field sensor to sense a magnetic field and produce data indicative of directional orientation;
a processor operably coupled to the position sensor and the magnetic field sensor, the processor being configured to use the directional orientation of the magnetic field sensor to correct orientation of the axis of the position sensor; and
a pacing generator configured to administer cardiac pacing therapy as directed by the processor. - View Dependent Claims (19, 20, 21, 22, 23)
increasing pacing rate if the patient is walking upstairs;
applying a MV response therapy if the patient is walking downstairs; and
applying an orthostatic compensation therapy if the patient moves from the supine position to the upright position.
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Specification