Therapy delivery architecture for implantable medical device

摘要

An implantable medical device (IMD) may include multiple power supply circuits and an electrostimulation therapy output circuit configured to, in response to a control signal specifying an electrostimulation therapy, controllably connect any one or more of the first or second power supply circuits to any one or more of a first electrostimulation output node or a second electrostimulation output node to deliver an electrostimulation. In an embodiment, the IMD may include an electrostimulation therapy return circuit configured to establish a return path for the electrostimulation delivered via one or more of the first electrostimulation output node or the second electrostimulation output node.

主权项

1. An implantable medical device, comprising:
a first power supply circuit; a second power supply circuit; an electrostimulation therapy control circuit, configured to provide a control signal specifying an electrostimulation therapy selected from a first electrostimulation therapy that uses the first power supply circuit and a second electrostimulation therapy that uses the second power supply circuit; an electrostimulation therapy output circuit coupled to the electrostimulation therapy control circuit and the first and second power supply circuits, the electrostimulation therapy output circuit configured to respond the control signal by controllably connecting the first power supply circuit to one or more electrostimulation output nodes to deliver the first electrostimulation therapy or controllably connecting the second power supply circuit to one or more of the electrostimulation output nodes to deliver the second electrostimulation therapy; and an electrostimulation therapy return circuit coupled to the electrostimulation therapy control circuit and configured to provide or maintain a charge-balance condition for the electrostimulation therapies, the electrostimulation therapy return circuit configured to respond to the control signal by establishing a first return path when the first electrostimulation therapy is selected and a second return path when the second electrostimulation therapy is selected, the first return path having a capacitance between at least one of the electrostimulation output nodes and a reference node to passively bleed charges to provide or maintain the charge-balanced condition during the first electrostimulation therapy, the second return path having a capacitance between at least one of the electrostimulation output nodes and the reference node to passively bleed charges to provide or maintain the charge-balanced condition during the second electrostimulation therapy; wherein each of the electrostimulation output nodes is configured to couple to one or more implantable electrodes.