Medical interventional device responsive to sudden hemodynamic change
First Claim
1. A method of controlling a therapeutic function of an implantable medical interventional device in the body of a patient to treat cardiac dysrhythmia, comprising the steps of:
- sensing variations of an intrinsic physiologic parameter indicative of substantially instantaneous hemodynamic condition of the patient;
generating an electrical signal representing the sensed variations of said parameter;
calculating mean and standard deviation of the generated electrical signal over a predetermined time interval,detecting a sudden hemodynamic change in the patient from the calculated mean and standard deviation, andresponding to a detected sudden hemodynamic change to control a therapeutic function of the implanted device.
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Accused Products
Abstract
A medical interventional device is adapted to be implanted in a patient'"'"'s body to provide a number of different controllable therapeutic functions including cardiac pacing, antitachycardia pacing, cardioversion and defibrillation. A sensor generates an electrical signal representing sensed variations of a physiologic parameter of the patient indicative of the substantially instantaneous hemodynamic condition of the patient. The physiologic parameter sensed may be any of blood pressure, blood oxygen content, minute ventilation, central venous temperature, pulse rate, blood flow, physical activity, or other parameter for that purpose. A computer calculates the mean and standard deviation of the generated signal over a predetermined time interval, and especially the quotient of the standard deviation and the mean from which to determine a sudden hemodynamic change such as a precipitous drop in cardiac output. The device accepts this as an indication of syncope warranting intervention with a defibrillating protocol, and triggers such response.
333 Citations
17 Claims
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1. A method of controlling a therapeutic function of an implantable medical interventional device in the body of a patient to treat cardiac dysrhythmia, comprising the steps of:
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sensing variations of an intrinsic physiologic parameter indicative of substantially instantaneous hemodynamic condition of the patient; generating an electrical signal representing the sensed variations of said parameter; calculating mean and standard deviation of the generated electrical signal over a predetermined time interval, detecting a sudden hemodynamic change in the patient from the calculated mean and standard deviation, and responding to a detected sudden hemodynamic change to control a therapeutic function of the implanted device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical interventional device for implanting in a patient'"'"'s body and including means for providing a plurality of controllable therapeutic functions comprising:
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sensor means for generating an electrical signal representing sensed variations of an intrinsic physiologic parameter indicative of the substantially instantaneous hemodynamic condition of the patient, computer means for calculating mean and standard deviation of the generated electrical signal over a predetermined time interval to determine therefrom a sudden hemodynamic change in the patient, and means responsive to a determination of a sudden hemodynamic change for controlling one of the plurality of controllable therapeutic functions of the device. - View Dependent Claims (9, 10, 11, 12)
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13. A defibrillator for implanting in a patient'"'"'s body, comprising:
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sensor means for generating an electrical signal representing sensed variations of a physiologic parameter of the patient indicative of instantaneous hemodynamic condition of the patient, analyzer means for computing mean and standard deviation of the electrical signal generated by the sensor means over a predetermined time interval as a measure of sudden hemodynamic change in the patient, and control means responsive to a finding of sudden hemodynamic change from the computation performed by said analyzer means for generating a defibrillation protocol from the defibrillator. - View Dependent Claims (14, 15, 16, 17)
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Specification