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US 12,746,399 B2Granted
Method and implantable system for constant current pacing
AssigneePacesetter, Inc.
InventorsReza Shahandeh, Ninous Davoudi, Frank Lee, David Doudna, Jeffery Crook
Life of this patent
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Abstract
An implantable system includes an implantable medical device (IMD) and a non-transvenous lead that is configured to be implanted outside of a heart. The IMD includes an output configured to be connected at least to the lead, a current generator (CG) circuit configured to generate pacing pulses, a switching circuit coupled between the CG circuit and the output, one or more capacitors coupled in parallel with the CG circuit and the switching circuit, and a control circuit coupled to the CG circuit. The control circuit is configured to manage the CG circuit to generate the pacing pulses with a constant current at the output.
Claims17
An implantable medical device (IMD), comprising:
- a case including an output configured to be connected to a lead;
- a current generator (CG) circuit configured to generate pacing pulses at the output, the CG circuit having a transformer with a primary winding and a secondary winding, a switch device connected with the primary winding, and an output diode connected with the secondary winding, the switch device configured to control conduction of electrical energy from a power source to the CG circuit;
- a switching circuit coupled in parallel with the CG circuit and the output between the output diode of the CG circuit and the output;
- one or more capacitors coupled in parallel with the CG circuit and the switching circuit between the output diode of the CG circuit and the switching circuit;
- and
- a control circuit coupled to the CG circuit and the switching circuit, the control circuit configured to manage the CG circuit during a low voltage mode to generate the pacing pulses, the control circuit configured to control the CG circuit and the switching circuit during a high voltage mode to charge the one or more capacitors and use the electrical energy stored in the one or more capacitors to deliver one or more shock pulses to the output,
- wherein, during the low voltage mode, the control circuit is configured to close the switching circuit to provide a closed, electrically conductive pathway between the secondary winding and the output, and to control the CG circuit such that the pacing pulses are generated from the secondary winding and conducted through the switching circuit to the output without the one or more capacitors or any other capacitor between the CG circuit and the switching circuit generating the pacing pulses.
4 more elements
A method comprising:
- managing, via a control circuit, a current generator (CG) circuit of an implantable medical device (IMD) to generate pacing pulses at an output of the IMD during a low voltage mode, the pacing pulses configured to be delivered to a patient via a lead implanted within the patient, the CG circuit having a transformer with a primary winding and a secondary winding, a switch device connected with the primary winding, and an output diode connected with the secondary winding,
- wherein the IMD further comprises a switching circuit and one or more capacitors, the switching circuit coupled in parallel with the CG circuit and the output between the output diode of the CG circuit and the output, the one or more capacitors coupled in parallel with the CG circuit and the switching circuit between the output diode of the CG circuit and the switching circuit;
- controlling conduction of electrical energy from a power source to the CG circuit using the switch device;
- closing, via the control circuit, the switching circuit to provide a closed, electrically conductive pathway between the secondary winding and the output during the low voltage mode so that the pacing pulses are generated from the secondary winding and conducted through the switching circuit to the output without the one or more capacitors or any other capacitor between the CG circuit and the switching circuit generating the pacing pulses;
- switching from the low voltage mode to a high voltage mode;
- and
- controlling the CG circuit and the switching circuit, via the control circuit, to charge the one or more capacitors during the high voltage mode and use electrical energy stored in the one or more capacitors to deliver one or more shock pulses to the output.
4 more elements
Dependencies are inferred from the claim text.