Energy adjusting circuit for producing an ultra-low energy defibrillation waveform with fixed pulse width and fixed tilt
First Claim
1. An energy adjusting circuit for use with a biphasic defibrillator, the defibrillator having an output with a circuit path for applying defibrillation pulse energy to a patient, the energy adjusting circuit comprising:
- an energy absorbing component for absorbing energy while the defibrillator is applying defibrillation pulse energy to the patient, the energy absorbing component when coupled in the circuit path of the output of the defibrillator comprising;
a first energy absorbing element coupled between a first output of the defibrillator and a first circuit node;
a second energy absorbing element coupled between a second output of the defibrillator and a second circuit node; and
a third energy absorbing element coupled between the first and second circuit nodes; and
a coupling component for coupling the energy absorbing component in the circuit path of the output of the defibrillator, the energy absorbing component when coupled in the circuit path of the output of the defibrillator absorbing a majority of the energy from the defibrillator while the defibrillator is applying defibrillation pulse energy to the patient.
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Accused Products
Abstract
An energy adjusting circuit for use with a defibrillator. The energy adjusting circuit reduces the defibrillation pulse energy that would otherwise be applied to the patient by the defibrillator. The energy adjusting circuit can be part of the defibrillator itself, or part of an adapter coupled to the output ports of a conventional defibrillator. In an adapter designed for pediatric defibrillation, the adapter may include paddles configured for use on babies and small children. The energy adjusting circuit may be formed entirely from passive components and may include a divider circuit with two resistors. The resistance of the two resistors is selected so as to absorb a predetermined percentage of the defibrillation pulse energy that would otherwise be applied to the patient. An isolation circuit may be further included to assist with the measurement of ECG signals through the electrodes. The components of the energy adjusting circuit can be selected so as to produce a defibrillation waveform that has a desired pulse width and tilt, both of which are approximately fixed over an expected range of patient impedances. The defibrillator may be configured to recognize the presence of the energy adjusting circuit, and to indicate to the user that the energy selection ranges have been adjusted accordingly.
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Citations
36 Claims
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1. An energy adjusting circuit for use with a biphasic defibrillator, the defibrillator having an output with a circuit path for applying defibrillation pulse energy to a patient, the energy adjusting circuit comprising:
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an energy absorbing component for absorbing energy while the defibrillator is applying defibrillation pulse energy to the patient, the energy absorbing component when coupled in the circuit path of the output of the defibrillator comprising;
a first energy absorbing element coupled between a first output of the defibrillator and a first circuit node;
a second energy absorbing element coupled between a second output of the defibrillator and a second circuit node; and
a third energy absorbing element coupled between the first and second circuit nodes; and
a coupling component for coupling the energy absorbing component in the circuit path of the output of the defibrillator, the energy absorbing component when coupled in the circuit path of the output of the defibrillator absorbing a majority of the energy from the defibrillator while the defibrillator is applying defibrillation pulse energy to the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An energy adjusting circuit for use with a biphasic defibrillator, the defibrillator comprising first and second output nodes, the energy adjusting circuit comprising:
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first and second circuit nodes;
a first energy reducing component coupled between said first output node and said first circuit node;
a second energy reducing component coupled between said second output node and said second circuit node;
a third energy reducing component coupled between said first and second circuit nodes;
a first electrode coupled to the first circuit node; and
a second electrode coupled to the second circuit node. - View Dependent Claims (19, 20, 21, 22)
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23. An energy adjusting circuit for use with a defibrillator that applies defibrillation pulses to a patient in the form of a waveform with a width and tilt, the tilt of the waveform produced by the defibrillator without the energy adjusting circuit being variable, the energy adjusting circuit comprising:
an energy reducing component that reduces part of the defibrillation pulse energy that is applied to the patient, the tilt of the waveform that is applied to the patient being determined in part by the impedance of the energy reducing component, the value of the impedance of the energy reducing component being selected so as to produce a predetermined tilt in the waveform, the predetermined tilt varying less than a selected amount over a selected range of patient impedances. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. In a defibrillator for applying defibrillation pulse energy to a patient, the defibrillator including defibrillation energy and control circuitry, the improvement comprising:
an energy adjusting circuit, the energy adjusting circuit comprising a coupling component for coupling the energy adjusting circuit to the defibrillation energy and control circuitry, the defibrillator and control circuitry when not coupled to the energy adjusting circuit producing a defibrillation waveform with a variable pulse width and tilt, the energy adjusting circuit when coupled to the defibrillation and control circuitry adjusting the shape of the defibrillation waveform that is applied to the patient such that the resulting defibrillation waveform has an approximately fixed pulse width and tilt over a selected range of patient impedances. - View Dependent Claims (32, 33, 34)
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35. An energy adjusting circuit for use with a defibrillator, the defibrillator having an output with a circuit path for applying defibrillation pulse energy to a patient through a pair of electrodes, the energy adjusting circuit comprising:
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an energy adjusting component for absorbing part of the defibrillation pulse energy from the defibrillator;
a coupling component for coupling the energy adjusting component in the circuit path of the output of the defibrillator;
the defibrillator being couplable to the patient through the electrodes without the energy adjusting component being coupled in the circuit path of the output of the defibrillator, the defibrillator without the energy adjusting component in the circuit path applying defibrillation pulse energy to the patient in a waveform with a variable pulse width and a variable tilt; and
the energy adjusting component when coupled in the circuit path of the output of the defibrillator reducing the defibrillation pulse energy to a level that is lower than the defibrillation pulse energy that would have been applied to the patient if the energy adjusting component had not been coupled in the circuit path of the output of the defibrillator, and resulting in a waveform with a relatively fixed pulse width and fixed tilt. - View Dependent Claims (36)
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Specification