Method and apparatus for delivering defibrillation and pacing energy from a single power source
First Claim
1. A circuit for delivering electrical energy as one of defibrillation pulses and pacing pulses to a patient, the circuit comprising:
- a power source;
an H-bridge comprising a plurality of switches which control the delivery of the electrical energy from the power source to the patient; and
a current control circuit which regulates electrical current supplied to the patient, the current control circuit serially connected with the H-bridge.
1 Assignment
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Accused Products
Abstract
A defibrillator circuit that delivers high voltage electrical defibrillation pulses and lower energy pacing pulses to a patient. The circuit includes a current regulator which is operative to control the current level applied to the patient. Control circuitry is provided which permits the current regulator to be disabled in the defibrillation mode of operation prior to application of defibrillation pulses. An H-bridge supplies pulses to the patient and the current regulation is provided serially with the H-bridge such that current is regulated regardless of the polarity of pulses applied to the patient.
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Citations
35 Claims
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1. A circuit for delivering electrical energy as one of defibrillation pulses and pacing pulses to a patient, the circuit comprising:
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a power source;
an H-bridge comprising a plurality of switches which control the delivery of the electrical energy from the power source to the patient; and
a current control circuit which regulates electrical current supplied to the patient, the current control circuit serially connected with the H-bridge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A defibrillator-pacer for delivering electrical energy to a patient, the defibrillator-pacer comprising:
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a storage circuit having first and second terminals, the storage circuit operable to store electrical energy;
an H-bridge circuit, coupled to the first terminal of the storage circuit, adapted to couple with the patient and operable to deliver electrical current from the storage circuit energy to the patient; and
a current control circuit, coupled with the H-bridge circuit and operable to electrically connect the H-bridge circuit with the second terminal of the storage circuit, to regulate the delivery of the electrical energy to the patient. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A defibrillator-pacer for delivering electrical energy to a patient, the defibrillator-pacer comprising:
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a storage circuit having first and second terminals, the storage circuit operable to store electrical energy;
an H-bridge circuit, coupled to the first terminal of the storage circuit, adapted to couple with the patient and operable to deliver electrical current from the storage circuit energy to the patient; and
a current control circuit, coupled with the H-bridge circuit and operable to electrically connect the H-bridge circuit with the second terminal of the storage circuit, to regulate the delivery of the electrical energy to the patient, the control circuit comprising;
a first transistor, an amplifier and a resistor arranged as a voltage to current follower which controls the current through the patient according to a predetermined scale factor determined by the resistor and a first control voltage, and a second transistor which bypasses the first resistor in response to a second control voltage to change the scale factor of the voltage to current follower.
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28. A defibrillator-pacer for delivering electrical energy to a patient, the defibrillator-pacer comprising:
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a storage circuit having first and second terminals, the storage circuit operable to store electrical energy;
an H-bridge circuit, coupled to the first terminal of the storage circuit, adapted to couple with the patient and operable to deliver electrical current from the storage circuit energy to the patient; and
a current control circuit, coupled with the H-bridge circuit and operable to electrically connect the H-bridge circuit with the second terminal of the storage circuit, to regulate the delivery of the electrical energy to the patient, the control circuit comprising;
a first resistor connected in series with the H-bridge which limits the current through the patient;
a first transistor, an amplifier and a second resistor arranged as a voltage to current follower which controls the current through the patient according to a predetermined scale factor determined by the first resistor, the second resistor and a first control voltage, a second transistor which bypasses the first resistor in response to a second control voltage to change the scale factor of the voltage to current follower. - View Dependent Claims (29)
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30. A method of regulating current delivered to a patient by an H-bridge circuit of a defibrillator-pacer, the H-bridge having a high potential node which receives electrical current from a first node of an energy storage circuit having electrical energy stored therein, a plurality of switches which direct the electrical current through the patient and a low potential node which returns the current to a second node of the storage circuit, the method comprising:
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inserting a current regulator circuit between the low potential node of the H-bridge and the second node of the storage circuit to control the current according to an input voltage signal;
selectively activating predetermined ones of the plurality of switches for at least one predetermined time interval to direct the current through the patient; and
applying the input voltage signal to the current regulator during the at least one predetermined time interval. - View Dependent Claims (31, 32, 33, 34, 35)
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Specification