Safe-mode implantable medical devices
First Claim
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1. An implantable medical device (IMD) for operating in a modified impedance mode, comprising:
- a stimulation unit to provide an electrical stimulation signal through a lead operatively coupled to said IMD; and
a controller comprisinga signal detection unit to receive an indication selected from the group consisting of an indication of the presence of a radio frequency (RF) coupled energy on said lead and an indication of the future presence of said RF coupled energy on said lead, andan impedance unit to modify an impedance of said lead based upon said indication received by said signal detection unit, wherein said impedance unit comprises;
at least one of a capacitive impedance, an inductive impedance, a resistive impedance, a short-circuit, and an open circuit;
a switching network capable of switching at least one of said capacitive impedance, inductive impedance, resistive impedance, said open circuit, and said short circuit to modify said impedance of said lead; and
an active cancellation unit, configured to provide upon the lead a controlled current signal for actively reducing said coupled energy.
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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.
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Citations
22 Claims
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1. An implantable medical device (IMD) for operating in a modified impedance mode, comprising:
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a stimulation unit to provide an electrical stimulation signal through a lead operatively coupled to said IMD; and a controller comprising a signal detection unit to receive an indication selected from the group consisting of an indication of the presence of a radio frequency (RF) coupled energy on said lead and an indication of the future presence of said RF coupled energy on said lead, and an impedance unit to modify an impedance of said lead based upon said indication received by said signal detection unit, wherein said impedance unit comprises; at least one of a capacitive impedance, an inductive impedance, a resistive impedance, a short-circuit, and an open circuit; a switching network capable of switching at least one of said capacitive impedance, inductive impedance, resistive impedance, said open circuit, and said short circuit to modify said impedance of said lead; and an active cancellation unit, configured to provide upon the lead a controlled current signal for actively reducing said coupled energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device system for providing an electrical stimulation signal to a patient, comprising:
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an electrode configured to be coupled to a tissue in a patient'"'"'s body; a lead operatively coupled to said electrode, said lead to carry an electrical stimulation signal to said electrode; and a signal generator operatively coupled to said lead, said signal generator to provide said electrical stimulation signal to said tissue through said lead, said signal generator comprising; a stimulation unit to provide said electrical stimulation signal through said lead, and a controller to receive an indication selected from the group consisting of an indication of the presence of a radio frequency (RF) coupled energy and an indication of the future presence of a RF coupled energy, said controller to also modify an impedance of said lead based upon said indication, and an impedance unit to modify an impedance of said lead based upon said indication received by said signal detection unit, wherein said impedance unit comprises; at least one of a capacitive impedance, an inductive impedance, a resistive impedance, a short-circuit, and an open circuit; a switching network capable of switching at least one of said capacitive impedance, inductive impedance, resistive impedance, said open circuit, and said short circuit to modify said impedance of said lead; and an active cancellation unit, configured to provide upon the lead a controlled current signal for actively reducing said coupled energy. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A medical device system for providing a therapy to a patient, comprising:
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an electrode coupled to a portion of a tissue in a patient'"'"'s body; a lead operatively coupled to said electrode, said lead configured to carry an electrical stimulation signal to said electrode; and a signal generator operatively coupled to said lead and comprising a stimulation unit to provide an electrical stimulation signal to said tissue through said lead, and an impedance unit to modify an impedance of said lead based upon a command from a controller comprising a signal detection unit having circuitry to receive an RF communication signal from an external source indicating a future coupled energy, and further configured to receive an indication of the presence of RF coupled energy on said lead, wherein said impedance unit comprises; at least one of a capacitive impedance, an inductive impedance, a resistive impedance, a short-circuit, and an open circuit; and a switching network capable of switching at least one of said capacitive impedance, inductive impedance, resistive impedance, said open circuit, and said short circuit to modify said impedance of said lead. - View Dependent Claims (20, 21)
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22. An implantable medical device (IMD) for operating in a modified impedance mode, comprising:
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a stimulation unit to provide an electrical stimulation signal through a lead operatively coupled to said IMD; and a controller comprising a signal detection unit configured to receive an indication of the presence of a radio frequency (RF) coupled energy on said lead and having circuitry to receive an RF communication signal from an external source indicating a future coupled energy, and an impedance unit to modify an impedance of said lead to have one of at least three impedance values, wherein said modifying is based upon said indication received by said signal detection unit, said RF communication signal, or both.
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Specification