Safe-mode operation of an implantable medical device
First Claim
Patent Images
1. A method for minimizing current in a lead circuit of an implantable medical device (IMD) system induced by coupled energy from an external source, comprising:
- providing a first impedance between a first node and a second node of the IMD, the lead circuit comprising a first lead configured to couple the first node of the IMD to a first target tissue and a second lead configured to couple the second node of the IMD to a second target tissue;
receiving an indication of the presence of the coupled energy on the lead circuit;
determining a characteristic of the coupled energy;
selecting a second impedance from a plurality of impedances based at least in part on the characteristic of the coupled energy, the second impedance selected to minimize the current induced by the coupled energy; and
providing the selected second impedance between the first node and the second node in place of the first impedance, wherein the first impedance and the second impedance are not open circuit impedances.
7 Assignments
0 Petitions
Accused Products
Abstract
A method, system, and apparatus for implementing a safe mode operation of an implantable medical system using impedance adjustment(s) are provided. A first impedance is provided to a lead. An indication of a possibility of a coupled energy is received. Based upon said indication, a second impedance associated with the lead to reduce the coupled energy is provided.
47 Citations
25 Claims
-
1. A method for minimizing current in a lead circuit of an implantable medical device (IMD) system induced by coupled energy from an external source, comprising:
-
providing a first impedance between a first node and a second node of the IMD, the lead circuit comprising a first lead configured to couple the first node of the IMD to a first target tissue and a second lead configured to couple the second node of the IMD to a second target tissue; receiving an indication of the presence of the coupled energy on the lead circuit; determining a characteristic of the coupled energy; selecting a second impedance from a plurality of impedances based at least in part on the characteristic of the coupled energy, the second impedance selected to minimize the current induced by the coupled energy; and providing the selected second impedance between the first node and the second node in place of the first impedance, wherein the first impedance and the second impedance are not open circuit impedances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for minimizing current in a lead circuit of an implantable medical device (IMD) system induced by coupled energy from an external source, comprising:
-
providing a first impedance between a first node and a second node of the IMD, the lead circuit comprising a first lead configured to coupled the first node of the IMD to a first portion of a cranial nerve and a second lead configured to couple the second node of the IMD to a second portion of the cranial nerve; detecting the coupled energy on the lead circuit at a detection unit of the IMD; determining a characteristic of the coupled energy at the detection unit; selecting a second impedance from at least three impedances based at least in part on the characteristic of the coupled energy, the second impedance selected to minimize the current induced by the coupled energy; providing the selected second impedance between the first node and the second node in place of the first impedance, wherein the first impedance and the second impedance are not open circuit impedances; and providing a stimulation signal from the IMD through the lead circuit to deliver a therapy to the cranial nerve in the presence of the coupled energy, the IMD having the second impedance between the first node and the second node. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. A method for minimizing current in a lead circuit of an implantable medical device (IMD) system induced by coupled energy from an external source, comprising:
-
providing a first impedance between a first node and a second node of the IMD, the lead circuit comprising a first lead configured to coupled the first node of the IMD to a first portion of a cranial nerve and a second lead configured to couple the second node of the IMD to a second portion of the cranial nerve; detecting the coupled energy on the lead circuit at a detection unit of the IMD; determining a characteristic of the coupled energy at the detection unit; selecting a second impedance from at least three impedances in a programmable impedance array based at least in part on the characteristic of the coupled energy, the second impedance selected to minimize the current induced by the coupled energy; providing the selected second impedance between the first node and the second node in place of the first impedance, wherein the first impedance and the second impedance are not open circuit impedances; providing a stimulation signal from the IMD through the lead circuit to deliver a therapy to the cranial nerve in the presence of the coupled energy, the IMD having the second impedance between the first node and the second node; determining that the coupled energy on the lead circuit has changed to a second coupled energy; and dynamically adjusting the second impedance to minimize a second current induced by the second coupled energy. - View Dependent Claims (24, 25)
-
Specification