Method and device for using impedance measurements based on electrical energy of the heart
First Claim
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1. A method of evaluating a condition of a patient having a heart and a thoracic impedance, comprising the steps of:
- detecting an electrical signal from said heart of said patient using signal circuitry via electrode means arranged and adapted for sensing said electrical signal, while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; and
determining said thoracic impedance based on said electrical signal.
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Abstract
A method and a device are disclosed for evaluating the cardio-circulatory and pulmonary condition of a patient, including determining the patient'"'"'s thoracic impedance based on information solely derived from the electrical energy generated by the patient'"'"'s own heart.
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Citations
32 Claims
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1. A method of evaluating a condition of a patient having a heart and a thoracic impedance, comprising the steps of:
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detecting an electrical signal from said heart of said patient using signal circuitry via electrode means arranged and adapted for sensing said electrical signal, while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; and determining said thoracic impedance based on said electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of adjusting a heart rate of a patient having a heart and thoracic impedance by means of an implantable rate adaptive pacemaker having a pacing rate, comprising the steps of:
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determining said thoracic impedance from said heart of said patient using signal circuitry while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; adjusting said pacing rate of said implantable rate adaptive pacemaker in response to said thoracic impedance. - View Dependent Claims (14, 15, 16, 17)
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18. A method of monitoring a cardio-circulatory status of a patient having a heart and a thoracic impedance with an implantable device, comprising the steps of:
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detecting an electrical signal from said heart of said patient using signal circuitry while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; and calculating said impedance based on said electrical signal. - View Dependent Claims (19, 20, 21, 22)
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23. A method of enhancing function of a body-implantable defibrillator having sensing electrodes adapted to function in conjunction with a heart of a patient, comprising the steps of:
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detecting an electrical signal generated by said heart of said patient using signal circuitry while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; and determining an impedance between said sensing electrodes of said defibrillator based, at least in part, on said electrical signal; and determining changes in said impedance between said sensing electrodes of said defibrillator based, at least in part, on said electrical signal.
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24. A device for monitoring a cardio-circulatory status of a patient having a heart and a thoracic impedance with an implantable device comprising:
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signal circuitry means for detecting an electrical signal generated by said heart of said patient while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry means; and means for calculating said thoracic impedance based on said electrical signal.
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25. A method of obtaining information about a cardiac function of a patient having a heart, comprising the steps of:
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detecting an electrical signal generated by said heart of said patient related to an EKG using signal circuitry while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry; and continuously processing said electrical signal during depolarization and repolarization of said heart of said patient, said electrical signal representing systole and diastole as different phases of said heart. - View Dependent Claims (26, 27)
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28. An implantable medical device for monitoring a cardio-pulmonary status of a patient having a heart and a thoracic impedance, comprising:
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signal circuitry means for detecting an electrical signal generated by said heart of said patient related to an EKG while using electrical energy generated by said heart of said patient and no other electrical power for said signal circuitry means; and means for determining said thoracic impedance based on said electrical signal related to said EKG. - View Dependent Claims (29, 30, 31, 32)
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Specification