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US 8,761,875 B2Granted
Method and apparatus for selectable energy storage partitioned capacitor
AssigneeCardiac Pacemakers, Inc.
InventorGregory J. Sherwood
Life of this patent
Estimating the term…
Abstract
One embodiment of the present subject matter includes a method for pulse generation in an implantable device, comprising measuring an impedance between a first electrode and a second electrode and delivering a pulse based on a pulse energy level and a pulse duration limit, comprising generating a pulse duration as a function of the pulse energy level and the impedance and selecting a capacitance value from a plurality of capacitances in a partitioned capacitor bank to deliver a pulse at the pulse energy level and wherein the pulse duration is less than the pulse duration limit.
Claims25
An apparatus, comprising:
- an implantable impedance sensor configured to deliver an impedance signal;
- an implantable capacitor stack disposed in a case and including a plurality of substantially flat electrodes in alignment, the stack including a first capacitor comprising a first partition of electrodes including a first anode and a first cathode, the first partition of a first capacitance to deliver a first pulse of a first amount of energy when discharged from a voltage, the stack including a second capacitor comprising a second partition of electrodes including a second anode and a second cathode, with an electrical insulator disposed between the first partition and the second partition, with the first anode electrically isolated from the second anode inside the case, the second partition to deliver a second amount of energy when discharged from the voltage;
- an electrolyte filling the case and contacting both the first partition and the second partition;
- implantable switch means for selectively switching the first capacitor and the second capacitor between a first mode for delivering a first preprogrammed level of pulse energy having a duration less than a first pulse duration limit, the first mode one in which the first capacitor is switched to discharge to a load while the second capacitor is switched out of electrical communication with the load, and a second mode for delivering a second preprogrammed level of pulse energy having a duration less than a second pulse duration limit, the second mode one in which the first capacitor and the second capacitor are adapted to discharge in parallel to the load;
- and
- a circuit coupled to the implantable impedance sensor and the implantable switch means, the circuit to select between the first mode and the second mode based on the signal of the impedance sensor, the first pulse duration limit and the second pulse duration limit.
3 more elements
An apparatus, comprising:
- an impedance sensor configured to deliver an impedance signal;
- a capacitor stack disposed in a case and including a plurality of substantially flat electrodes in alignment, the stack including a first partition of electrodes including a first anode and a first cathode, the first partition of a first capacitance, the stack including a second partition of electrodes including a second anode and a second cathode, with an electrical insulator disposed between the first partition and the second partition, the second partition of a second capacitance smaller than the first capacitance;
- an implantable switch configured to selectively switch the first partition and the second partition between a first mode for delivering a first preprogrammed level of pulse energy having a duration less than a first pulse duration limit, the first mode one in which one of a group including the first partition and the second partition is selectively switched to discharge to a load while the other is switched out of electrical communication with the load, and a second mode for delivering a second preprogrammed level of pulse energy having a duration less than a second pulse duration limit, the second mode one in which the first partition and the second partition are discharged in parallel to the load;
- and
- a circuit coupled to the impedance sensor and the switch, the circuit to select between the first mode and the second mode based on the signal of the impedance sensor.
2 more elements
An apparatus, comprising:
- an impedance sensor configured to deliver an impedance signal;
- a capacitor stack disposed in a case and including a plurality of substantially flat electrodes in alignment, the stack including a first partition of electrodes including a first anode and a first cathode, the first partition of a first capacitance, the stack including a second partition of electrodes including a second anode and a second cathode, with an electrical insulator disposed between the first partition and the second partition, the second partition of a second capacitance smaller than the first capacitance;
- an implantable switch means for selectively switching the first partition and the second partition between a first mode for delivering a first preprogrammed level of pulse energy having a duration less than a first pulse duration limit, the first mode one in which one of a group including the first partition and the second partition is selectively switched to discharge to a load while the other is switched out of electrical communication with the load, and a second mode for delivering a second preprogrammed level of pulse energy having a duration less than a second pulse duration limit, the second mode one in which the first partition and the second partition are discharged in parallel to the load;
- and
- a circuit coupled to the impedance sensor and the implantable switch means, the circuit to select between the first mode and the second mode based on the signal of the impedance sensor.
2 more elements
Dependencies are inferred from the claim text.