Pacemaker with patient effort-controlled frequency
First Claim
1. A pacemaker having a stimulation frequency controlled by the patient'"'"'s effort according to a control parameter computer from the acceleration measured at the level of the patient'"'"'s trunk, comprising first means for measuring acceleration along a first axis, second means for measuring acceleration along a second axis, and third means for measuring acceleration along a third axis, wherein the third axis is perpendicular to said first and second axes, and said first and second axes are perpendicular to one another and parallel to said flat surface, and wherein said first, second and third measuring means operate independently of one another;
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1 Assignment
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Accused Products
Abstract
A pacemaker with patient effort-controlled stimulation frequency that responds to a control parameter. Accelerometers (1) with capacity variation are placed on a substratum. Each of the accelerometers is sensitive in one direction of a Cartesian coordinate system. The output of the accelerometers are combined and integrated over a small time constant to produce a signal representative of the patient'"'"'s metabolic power exerted. The signal is then used to control the stimulation frequency of the pacemaker. The integration may be based on the sum of the absolute value of the acceleration signals or the square root of the sum of the squares of the acceleration signals.
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Citations
70 Claims
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1. A pacemaker having a stimulation frequency controlled by the patient'"'"'s effort according to a control parameter computer from the acceleration measured at the level of the patient'"'"'s trunk, comprising first means for measuring acceleration along a first axis, second means for measuring acceleration along a second axis, and third means for measuring acceleration along a third axis, wherein the third axis is perpendicular to said first and second axes, and said first and second axes are perpendicular to one another and parallel to said flat surface, and wherein said first, second and third measuring means operate independently of one another;
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means for determining said control parameter for controlling the stimulation frequency as a function of the measured acceleration in said first, second and third axes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing a control parameter for a pacemaker having a stimulation frequency controlled by the patient'"'"'s effort, comprising:
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measuring first and second signals corresponding respectively to the acceleration, in response to patient effort, at the level of the patient'"'"'s trunk along two axes perpendicular to one another; measuring a third signal corresponding to the acceleration, in response to patient effort, at the level of the patient'"'"'s trunk along a third axis perpendicular to said first, second and third signals are measured independently of one another; computing a control parameter as a function of said first, second and third signals; and providing said control parameter for controlling the pacemaker stimulation frequency; - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A pacemaker with a stimulation frequency controlled by a control parameter related to the patient'"'"'s effort, comprising:
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a pacemaker box having a flat surface for implanting in a vertical orientation in a patient; first means for measuring a first signal corresponding to the acceleration due to patient effort along a first axis; second means for measuring a second signal corresponding to the acceleration due to patient effort along a second axis, wherein the first and second axes are perpendicular to one another and parallel to said flat surface of the pacemaker box; and means for computing a control parameter for controlling the parameter stimulation frequency based on the first and second signals. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for providing a control parameter related to the effort of a patient for a pacemaker having a stimulation frequency controlled by the patient'"'"'s effort, comprising:
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providing a pacemaker box with a flat surface for implantation in a patient so that said flat surface is disposed in a vertical orientation; measuring first and second signals corresponding to the acceleration, in response to patient effort, along first and second axes which are perpendicular to one another and parallel to said flat surface of the pacemaker box; computing a control parameter based on the first and second signals; and providing said control parameter for controlling the pacemaker stimulation frequency. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A pacemaker having a frequency controlled by a patient'"'"'s effort comprising:
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a first accelerometer having a first signal corresponding to acceleration along a first axis; a second accelerometer having a second signal corresponding to acceleration along a second axis; a third accelerometer having a third signal corresponding to acceleration along a third axis, the first, second, and third axes being orthogonal; means for computing a control parameter, representative of the patient'"'"'s effort for varying the pacemaker frequency, as a function of the first, second, and third signals, said computing means further comprising means for summing the absolute values of the first, second, and third signals and means for integrating said sum over a time period and producing an output signals that is said integrated sum at the end of said time period, wherein the output signal represents said control parameter. - View Dependent Claims (33, 34, 35)
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36. A pacemaker having a stimulation frequency controlled by a control parameter related to the patient'"'"'s effort comprising:
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a first accelerometer that is sensitive to motion in one direction having a first signal output corresponding to acceleration along a first axis; a second accelerometer that is sensitive to motion in one direction having a second signal output corresponding to acceleration along a second axis, the first and second axes being perpendicular; wherein the first and second accelerometers are each comprised of a flat substratum disposed in a plane such that the one direction of sensitivity is contained in said substratum plane; and means for computing a control parameter, representative of the patient'"'"'s effort for varying the pacemaker frequency, as a function of the first and second signals. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method for calculating a control parameter related to a patient'"'"'s effort for use in controlling the stimulation frequency of a pacemaker comprising:
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a) measuring first and second signals corresponding to the acceleration along first and second axes which are perpendicular to one another; b) providing the sum of the absolute values of the first and second signals as a third signal; and c) integrating the third signal over a time period and providing said integrated third signal as the control parameter, wherein the control parameter is used to control the stimulation frequency of a pacemaker. - View Dependent Claims (52, 53, 54)
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55. A method for calculating a control parameter related to a patient'"'"'s effort for use in controlling the stimulation frequency of a pacemaker, comprising:
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a) providing first and second accelerometric sensors, each being comprised of a flat substratum and sensitive in one direction contained in the plane of said substratum, wherein the one direction of the first accelerometric sensor and the one direction of the second accelerometric sensor are perpendicular; b) sensing the output of the first and second accelerometric sensors as first and second signals; c) processing the first and second signals to form a third signal as a function of the first and second signals, said function being related to the patient'"'"'s effort producing the first and second signals; and d) integrating the third signal over a time period and providing said integrated third signal as a control parameter, wherein the control parameter is used to control the stimulation frequency of a pacemaker. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification