Method and apparatus for applying a rectilinear biphasic power waveform to a load
AssigneeZOLL Medical Corporation
InventorJames G Radzelovage
Life of this patent
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Abstract
A system to deliver therapeutic energy to a patient, the system including a storage capacitor configured to store and release the therapeutic energy, a boost converter circuit coupled to the storage capacitor, and a current flow control circuit coupled to the boost converter circuit and including a plurality of control circuits configured to control a current output from the current flow control circuit in a therapeutic biphasic voltage waveform upon release of the therapeutic energy from the storage capacitor, wherein the therapeutic biphasic voltage waveform includes a ramped increase in voltage from approximately zero volts to a desired therapeutic voltage level over a time interval greater than 1 millisecond and less than a time associated with a phase switch.
Claims22
A system for delivering a therapeutic waveform to a patient, the system comprising:
- a capacitor configured to provide energy for the therapeutic waveform to be delivered to the patient;
- a converter circuit, comprising at least one switch, coupled with the capacitor, configured to control the therapeutic waveform delivered to the patient according to a desired therapeutic waveform, the converter circuit comprising:
- at least one inductor configured to store a portion of the energy provided by the capacitor during delivery of the therapeutic waveform to the patient,
- a current sensing network, coupled with the at least one inductor, configured to sense at least one electrical signal indicative of a current applied to the patient, and
- a controller, coupled with the at least one inductor and the current sensing network, configured to:
- perform a comparison of a magnitude of the current applied to the patient with the desired therapeutic waveform, and
- based on the comparison, control a state of the at least one switch to adjust the therapeutic waveform being delivered to the patient according to the desired therapeutic waveform;
- and
- a polarity control network, coupled with the converter circuit, configured to apply the therapeutic waveform to the patient according to the desired therapeutic waveform.
A method for delivering a desired therapeutic waveform to a patient, the method comprising:
- storing, in a capacitor, a quantity of energy to be used in delivering the desired therapeutic waveform;
- using a converter circuit coupled with the capacitor:
- releasing at least a portion of the stored quantity of energy from the capacitor to the patient over a period of time in accordance with the desired therapeutic waveform, comprising transferring energy to at least one inductor coupled with the capacitor,
- using a current sensing network coupled with the at least one inductor, sensing at least one electrical signal indicative of current applied to the patient, and
- using at least one switch, adjusting a therapeutic waveform being delivered to the patient according to the desired therapeutic waveform;
- and
- using a polarity control network coupled with the converter circuit, delivering the transferred energy to the patient to deliver the desired therapeutic waveform to the patient.
Dependencies are inferred from the claim text.