Dual sensor rate responsive pacemaker
First Claim
1. A pacemaker comprising:
- metabolic rate sensor means for generating a metabolic indicated rate signal dependent on a physiological demand of a patient in response to a physical activity by the patient;
activity rate sensor means for generating an activity indicated rate signal dependent on an electromechanical measurement indicative of an instantaneous parameter characteristic of said physical activity;
combining means for generating a time dependent combined rate signal dependent on said metabolic indicated rate, said combining means including transition means for detecting a transition in said physical activity, said metabolic indicated rate being enhanced with said activity indicated rate during said transition; and
pacing means for generating pacing signals in response to said combined rate.
2 Assignments
0 Petitions
Accused Products
Abstract
An electronic pacemaker generating pacing signals includes both a metabolic rate responsive sensor monitoring a physiological parameter and an activity rate responsive sensor monitoring movement of a patient'"'"'s body during exercise. The measurements from each of the sensors are used to develop a corresponding rate signal and the two signals are combined to generate a dual sensor rate used to determine the timing of the pacing signals. The physiological parameter may be for example minute volume variation while the body movement may be monitored for example by using an accelerometer. The activity rate responsive sensor output is preferably used as an indication of a transition of a level of exercise, when a faster change in the pacing rate is desirable.
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Citations
29 Claims
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1. A pacemaker comprising:
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metabolic rate sensor means for generating a metabolic indicated rate signal dependent on a physiological demand of a patient in response to a physical activity by the patient; activity rate sensor means for generating an activity indicated rate signal dependent on an electromechanical measurement indicative of an instantaneous parameter characteristic of said physical activity; combining means for generating a time dependent combined rate signal dependent on said metabolic indicated rate, said combining means including transition means for detecting a transition in said physical activity, said metabolic indicated rate being enhanced with said activity indicated rate during said transition; and pacing means for generating pacing signals in response to said combined rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pacemaker comprising:
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metabolic rate means for generating a metabolic indicated rate signal dependent on a metabolic function of a patient; activity rate means for generating an activity indicated rate signal dependent on a physical parameter indicative of a level of physical activity of said patient; combining means for combining said metabolic and activity indicated rate signals into a dual rate signal, said dual rate signal being limited to a preselected maximum level, said combining means including transition means for determining a transition of said physical parameter wherein said combined means combines said signals during said transition by boosting said metabolic rate indicated signal with said activity indicated rate signal and first limiting means for limiting said activity indicated rate signal to a preselected range dependent on said maximum level; and pacer means for generating pacing signals responsive to said dual rate signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A pacemaker comprising:
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metabolic rate means for generating a metabolic indicated rate (MIR) signal dependent on a metabolic function of a patient; activity rate means for generating an activity indicated rate (AIR) signal dependent on a physical parameter indicative of a level of physical activity of said patient; combining means for combining said metabolic and activity indicated rate signals into a dual indicated rate (DIR) signal in accordance with a plurality of preselected rules, said rules being selected to augment said metabolic indicated rate signal by said activity indicated rate signal during a transition of said physical parameter; and pacer means for generating pacing signals responsive to said dual indicated rate signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification