Implantable cardioverter defibrillator having fast action operation
First Claim
1. An implantable cardiac rhythm management device, comprising:
- a housing containing rhythm management circuitry;
the circuitry including a battery, a transformer, and a single capacitor connected via charging circuitry operable to transmit current from the battery to charge the single capacitor;
a plurality of electrodes connected to the circuitry and operable to transmit a shock from the single capacitor to cardiac tissue outside of the housing; and
the combined volume of the battery and transformer being at least 1.5 times the volume of the single capacitor.
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Accused Products
Abstract
An implantable cardiac rhythm management device has a housing containing rhythm management circuitry. The circuitry includes a battery, a transformer, and a capacitor connected via charging circuitry that operates to transmit current from the battery to charge the capacitor. A number of leads connected to the circuitry operate to transmit a shock from the capacitor to cardiac tissue outside of the housing. The capacitor has a smaller volume than the combined volume of the battery and transformer, such that it reaches a selected charge voltage within a limited time interval. The device may operate to limit capacitor charging to less than a selected energy storage capability at a given voltage, and components may be selected to limit charging time to less than 2 seconds. The component selection and charge duration may be based on a time-based function of defibrillation threshold (DFT).
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Citations
20 Claims
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1. An implantable cardiac rhythm management device, comprising:
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a housing containing rhythm management circuitry; the circuitry including a battery, a transformer, and a single capacitor connected via charging circuitry operable to transmit current from the battery to charge the single capacitor; a plurality of electrodes connected to the circuitry and operable to transmit a shock from the single capacitor to cardiac tissue outside of the housing; and the combined volume of the battery and transformer being at least 1.5 times the volume of the single capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable cardiac rhythm management device, comprising:
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a housing containing rhythm management circuitry; the circuitry including a battery, a transformer, and a single capacitor connected via charging circuitry operable to transmit current from the battery to charge the single capacitor; a plurality of electrodes connected to the circuitry and operable to transmit a shock from the single capacitor to cardiac tissue outside of the housing; the single capacitor having a capacitance of less than 50 μ
F; andthe charge circuitry operable to charge the single capacitor to a voltage of at least 700 volts. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating an implantable cardiac rhythm management device having detection circuitry, a battery and a transformer connected via charging circuitry, the method comprising:
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in response to an abnormality detected by the detection circuitry, generating current flow from the battery to a single capacitor to charge the single capacitor; generating the current flow during a charging interval having a limited selected duration based on a DFT time function; and discharging the single capacitor to deliver a therapeutic shock after the charging interval; wherein the combined volume of the battery and transformer being at least 1.5 times the volume of the single capacitor. - View Dependent Claims (18, 19, 20)
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Specification