Systems and methods for dc protection in implantable pulse generators

A neurostimulation system comprising:

• an implantable pulse generator (IPG) ground;
• an IPG case;
• a stimulation lead comprising a plurality of electrodes;
• and
• an IPG coupled to the IPG ground, the IPG case, and the stimulation lead, the IPG comprising circuitry that comprises:
• at least one anode node;
• at least one cathode node;
• a plurality of switching circuits, each switching circuit coupled to the at least one anode node and the at least one cathode node;
• a plurality of output channels, each output channel coupled between an associated switching circuit and at least one electrode;
• a first DC blocking capacitor coupled between the at least one anode node and the plurality of switching circuits;
• a second DC blocking capacitor coupled between the at least one cathode node and the plurality of switching circuits;
• and
• mitigation circuitry operable to limit DC leakage from the plurality of switching circuits through the plurality of output channels.

A method of assembling circuitry for an implantable pulse generator (IPG) of a neurostimulation system including an IPG ground, a plurality of electrodes, and an IPG case, the method comprising:

• providing at least one anode node and at least one cathode node;
• electrically coupling a plurality of switching devices to the at least one anode node and the at least one cathode node;
• electrically coupling each of a plurality of output channels between an associated switching device and at least one electrode;
• electrically coupling a first DC blocking capacitor between the at least one anode node and the plurality of switching circuits;
• electrically coupling a second DC blocking capacitor between the at least one cathode node and the plurality of switching circuits;
• and
• implementing migration circuitry operable to limit DC leakage from the plurality of switching circuits through the plurality of output channels.