Active implantable medical device having a control function responsive to at least one physiological parameter
First Claim
1. An active implantable medical device having a control function that is enslaved to at least one physiological parameter, comprising:
- at least one effort sensor, measuring a preponderantly physiological parameter and having an effort output signal corresponding to an effort developed by a patient bearing the device;
at least one activity sensor, measuring a preponderantly physical parameter, and having an activity output signal corresponding to the effort developed by said patient, said activity and effort sensors each having a response time, the activity sensor response time being faster than the effort sensor response time; and
selection means, functioning in response to each of the effort and activity sensors, for determining a state of each sensor, identifying a change in state of at least one sensor, periodically analyzing the relative sequence of successive state changes of the effort and activity sensors according to a predetermined criteria intrinsic to the device, and for selecting one of the effort and activity sensors as a function of the result of said periodic analysis, in a manner to realize, at a given instant, an enslavement respecting most nearly the physiology of the patient corresponding to his/her activity and effort level at said given instant.
2 Assignments
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Accused Products
Abstract
An active implantable medical device, particularly a cardiac pacemaker, enslaved to at least one physiological parameter. The device is susceptible to function in an enslaved mode by controlling at least one function, particularly that of a cardiac stimulation frequency, based on at least one physiological parameter, and includes at least one effort sensor, measuring a predominantly physiological parameter and delivering an output signal that is a function of the effort developed by a patient bearing the device and at least one activity sensor, especially a sensor having a response time that is more rapid than the effort sensor, for measuring a predominantly physical parameter. The device also includes a selection means, functioning in response to at least one activity and at least one effort signal of each of the sensors, to analyze periodically the relative sequence of successive state changes of the sensors according to predetermined criteria intrinsic to the device, and to select one of the sensors for the enslavement function as a result of this analysis, in a manner to realize, at a given moment, an enslavement mode function respecting most nearly the physiology of the patient corresponding to the activity and effort level of the patient at the given moment.
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Citations
27 Claims
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1. An active implantable medical device having a control function that is enslaved to at least one physiological parameter, comprising:
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at least one effort sensor, measuring a preponderantly physiological parameter and having an effort output signal corresponding to an effort developed by a patient bearing the device; at least one activity sensor, measuring a preponderantly physical parameter, and having an activity output signal corresponding to the effort developed by said patient, said activity and effort sensors each having a response time, the activity sensor response time being faster than the effort sensor response time; and selection means, functioning in response to each of the effort and activity sensors, for determining a state of each sensor, identifying a change in state of at least one sensor, periodically analyzing the relative sequence of successive state changes of the effort and activity sensors according to a predetermined criteria intrinsic to the device, and for selecting one of the effort and activity sensors as a function of the result of said periodic analysis, in a manner to realize, at a given instant, an enslavement respecting most nearly the physiology of the patient corresponding to his/her activity and effort level at said given instant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An implantable cardiac pacemaker having an enslaved operating mode in which a cardiac stimulation frequency is determined as a function of at least one physiological parameter of a patient bearing the device in an enslaved operating mode, comprising:
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a first sensor, responsive to a physiological parameter of the patient, having an effort output signal corresponding to an effort developed by said patient; a second sensor, responsive to a physical parameter of the patient, having an activity output signal corresponding to the effort developed by said patient, said first and second sensors each having a response time, the second sensor response time being faster than the first sensor response time; a signal processor having an input to receive each of the first and second output signals sensors, and operate on said signals to periodically analyze said received effort and activity output signals, determine a state of at least one of said first and second sensors at a given time and determine whether said at least one sensor state has changed from a first state determined at a first time to a second state determined at a second time, and analyze a relative sequence of successive state changes of the first and second sensors according to a predetermined criteria intrinsic to the device; and means for selecting one of the first and second sensors as a function of the result of said periodic analysis, wherein the cardiac stimulation frequency is determined in response to the one selected sensor output signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for determining a control function output enslaved to at least a physiological parameter comprising:
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(a) monitoring a physiological parameter of a patient corresponding to an effort developed by the patient; (b) monitoring a physical parameter of said patient corresponding to said effort developed by the patient; (c) determining a physiological state as a function of the monitored physiological parameter, the physiological state being one of a rest state, an activity state, and a recovery state; (d) determining a physical state as a function of the monitored physical parameter, the physical state being one of a rest state, an activity state, and a recovery state; (e) selecting one of said monitored physiological parameter and said monitored physical parameter and determining said control function output as one of a first function of said monitored physiological parameter and a second function of said monitored physical parameter, wherein step (e) further comprises; (i) determining a first physiological state in response to said monitored physiological parameter sample at a first time; (ii) determining whether the determined first physiological state is different from a determined physiological state in response to a monitored physiological parameter at a second time prior to said first time; (iii) in response to said step (e)(ii) not determining a difference in said physiological state, determining a first physical state in response to a first monitored physical parameter at a third time; and (iv) selecting said control function output to be one of the first function and the second function according to a predetermined set of criteria relating the determined effort state and the determined activity state. - View Dependent Claims (25, 26, 27)
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Specification