# US 2014/0155970 A1 · Implantable medical device having electromagnetic interference filter device to reduce pocket tissue heating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155970 A1 - Document ID: US20140155970A1 - Status: Published application - Kind: A1 - Application number: 14/094,428 - Filed: 2013-12-02 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: Boston Scientific Neuromodulation Corporation - Applicants: Boston Scientific Neuromodulation Corporation - Inventors: Joseph M. Bocek; Kiran K. Gururaj; Matthew Lee McDonald; Gaurav Gupta; Mizanur Rahman; Ross D. Venook - Web page: https://patentgrep.com/patent/US20140155970A1 ## CPC - A61N 1/3718: {Monitoring of or protection against external electromagnetic fields or currents} - A61N 1/0551: {Spinal or peripheral nerve electrodes} - A61N 1/3605: {Implantable neurostimulators for stimulating central or peripheral nerve system} - A61N 1/05: for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence) - A61N 1/086: {Magnetic resonance imaging [MRI] compatible leads} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract An active implantable medical device (AIMD) for use with a medical lead carrying at least one lead electrode. The AIMD comprises interior electronic circuitry configured for performing a medical function via the medical lead, an electrically conductive case containing the interior electronic circuitry, at least one electrical terminal configured for electrically coupling the electronic circuitry respectively to the lead electrode(s), and an inductive element coupled in series between the electrical terminal(s) and the case. The inductive element is configured for hindering the shunting of electrical current from the at least one electrical terminal to the case that has been induced by electromagnetic interference (EMI) impinging on the medical lead. ## Claims ### Claim 1 An active implantable medical device (AIMD) for use with a medical lead carrying at least one lead electrode, comprising: interior electronic circuitry configured for performing a medical function via the medical lead; an electrically conductive case containing the interior electronic circuitry; at least one electrical terminal configured for electrically coupling the electronic circuitry respectively to the least one lead electrode; and an inductive element coupled in series between the at least one electrical terminal and the case, the inductive element being configured for hindering the shunting of electrical current from the at least one electrical terminal to the case that has been induced by electromagnetic interference (EMI) impinging on the medical lead. ### Claim 2 (depends on 1) The AIMD of claim 1, wherein the inductive element is electrically coupled in series between the interior electronic circuitry and one of the at least one electrical terminal and the case, and the interior electronic circuitry is configured to operate at a frequency below the frequency of the induced electrical current, thereby allowing electrical current to be conveyed between the at least one electrical terminal and the interior electronic circuitry. ### Claim 3 (depends on 2) The AIMD of claim 2, wherein the one of the at least one electrical terminal and the case is the at least one electrical terminal. ### Claim 4 (depends on 3) The AIMD of claim 3, wherein the inductive element has an inductance value equal to at least 0.5 μH. ### Claim 5 (depends on 3) The AIMD of claim 3, wherein the inductive element has an inductance value equal to at least 1.0 μH. ### Claim 6 (depends on 3) The AIMD of claim 3, wherein the inductive element has an inductance value equal to at least 3.0 μH. ### Claim 7 (depends on 2) The AIMD of claim 2, wherein the one of the at least one electrical terminal and the case is the case. ### Claim 8 (depends on 7) The AIMD of claim 7, wherein the inductive element has an inductance value in the range of 50 nH to 200 nH. ### Claim 9 (depends on 2) The AIMD of claim 2, wherein the operating frequency of the interior electronic circuitry is below 100 KHz, and the frequency of the induced electrical current is above 1 MHz. ### Claim 10 (depends on 2) The AIMD of claim 2, wherein the operating frequency of the interior electronic circuitry is below 1 KHz, and the frequency of the induced electrical current is at least 64 MHz. ### Claim 11 (depends on 2) The AIMD of claim 2, further comprising at least one capacitive element electrically coupled respectively in series between the at least one electrical terminal and a common terminal, and another capacitive element electrically coupled in series between the case and the common terminal, thereby electrically isolating the at least one electrical terminal and case from each other at the operating frequency. ### Claim 12 (depends on 1) The AIMD of claim 1, wherein the inductive element being is configured for preventing the shunting of induced electrical current from the at least one electrical terminal to the case. ### Claim 13 (depends on 1) The AIMD of claim 1, wherein the interior electronic circuitry is configured for conveying electrical stimulation energy between the at least one electrical terminal and the case. ### Claim 14 (depends on 1) The AIMD of claim 1, wherein the interior electronic circuitry is configured for sensing a physiological parameter between the at least one electrical terminal and the case. ### Claim 15 (depends on 1) The AIMD of claim 1, further comprising a connector configured for removably connecting the lead to the at least one electrical terminal.