Medical interventional device with accelerometer for providing cardiac therapeutic functions
First Claim
1. A medical interventional device for implanting in the body of a patient to provide cardiac therapeutic functions including bradycardia pacing, rate adaptive pacing, antitachycardia pacing, cardioversion and defibrillation on demand, said device comprising:
- accelerometer means for sensing accelerational and gravitational effects indicative of at least one of position, posture and physical activity of the patient, for generating a first electrical signal representative thereof, said accelerometer means comprising transducer means for converting mechanical movement to an electrical output representative thereof,sensor means for detecting a physiologic parameter of the patient attributable to other than primarily accelerational and gravitational effects and indicative of cardiac activity of the patient, and for generating a second electrical signal representative of said cardiac activity,analyzer means responsive to both of said first and second electrical signals for determining the occurrence of a cardiac dysrhythmia therefrom,control means responsive to said determination of cardiac dysrhythmia for applying one of the cardiac therapeutic functions to the heart of the patient appropriate to treat the cardiac dysrhythmia, andhybrid electronic circuitry means for electronically integrating said accelerometer means, analyzer means and control means.
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Accused Products
Abstract
A medical interventional device adapted to be implanted in the body of a patient provides a plurality of cardiac therapeutic functions including bradycardia pacing, rate adaptive pacing, antitachycardia pacing, cardioversion and defibrillation on demand. An accelerometer in or associated with the device senses accelerational and gravitational effects indicative of at least one of position, posture and physical activity of the patient, and generates an electrical signal representative of the position, posture and physical activity of the patient of which the sensed effect is representative. The accelerometer acts as a transducer to convert mechanical movement to an electrical output representative of such movement. Another sensor detects a physiologic parameter of the patient indicative of cardiac activity of the patient, and generates another electrical signal representative of the cardiac activity. An analyzer is responsive to both of the electrical signals for determining the occurrence of a cardiac dysrhythmia of the patient, and a controller responsive to the determination of cardiac dysrhythmia generates a cardiac therapy of the device for application to the patient'"'"'s heart appropriate to treat the cardiac dysrhythmia. Hybrid electronic circuitry integrates the accelerometer, analyzer and controller as part of the electrical circuitry of the device.
338 Citations
13 Claims
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1. A medical interventional device for implanting in the body of a patient to provide cardiac therapeutic functions including bradycardia pacing, rate adaptive pacing, antitachycardia pacing, cardioversion and defibrillation on demand, said device comprising:
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accelerometer means for sensing accelerational and gravitational effects indicative of at least one of position, posture and physical activity of the patient, for generating a first electrical signal representative thereof, said accelerometer means comprising transducer means for converting mechanical movement to an electrical output representative thereof, sensor means for detecting a physiologic parameter of the patient attributable to other than primarily accelerational and gravitational effects and indicative of cardiac activity of the patient, and for generating a second electrical signal representative of said cardiac activity, analyzer means responsive to both of said first and second electrical signals for determining the occurrence of a cardiac dysrhythmia therefrom, control means responsive to said determination of cardiac dysrhythmia for applying one of the cardiac therapeutic functions to the heart of the patient appropriate to treat the cardiac dysrhythmia, and hybrid electronic circuitry means for electronically integrating said accelerometer means, analyzer means and control means. - View Dependent Claims (2, 3, 4, 5)
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6. A defibrillator for implanting in the body of a patient, comprising:
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accelerometer means for generating an electrical signal representing sensed movement of a portion of the accelerometer means indicative, when the accelerometer means is implanted in the patient, of at least one of position, posture and physical activity of the patient, analyzer means responsive to the electrical signal generated by the accelerometer means as an indicia of validity of a determination that the patient is experiencing fibrillation, and control means responsive to validation by said analyzer means of said determination of fibrillation for generating a predetermined defibrillation protocol to be applied to the patient'"'"'s heart. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of defibrillating a patient'"'"'s heart with a defibrillator device implanted in the body of a patient, the defibrillator device including means for providing cardiac therapeutic functions in addition to defibrillation including at least some of bradycardia pacing, antitachycardia pacing and cardioversion, comprising the device-implemented steps of:
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detecting at least one of current position, posture and physical activity of the patient and generating an electrical signal representative thereof, employing said electrical signal as a confirmation of at least one other signal indicative of of fibrillation to generate a predetermined defibrillation protocol, and applying said defibrillation protocol to the patient'"'"'s heart. - View Dependent Claims (13)
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Specification