# US 2018/0020919 A1 · Implantable medical device system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0020919 A1 - Document ID: US20180020919A1 - Status: Published application - Kind: A1 - Application number: 15/650,018 - Filed: 2017-07-14 - Published: 2018-01-25 - Earliest claimed: 2016-07-20 - Assignees: BIOTRONIK SE & Co. KG - Applicants: BIOTRONIK SE & Co. KG - Inventors: James W. HESS - Web page: https://patentgrep.com/patent/US20180020919A1 ## CPC - A61B 5/0031: {Implanted circuitry} - A61B 5/02: Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow - A61N 1/086: {Magnetic resonance imaging [MRI] compatible leads} - A61N 1/18: Applying electric currents by contact electrodes - A61N 1/37: Monitoring; Protecting - A61N 1/3718: {Monitoring of or protection against external electromagnetic fields or currents} - A61N 1/37229: {Shape or location of the implanted or external antenna} - A61N 1/056: {Transvascular endocardial electrode systems} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - 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 The invention relates to an implantable medical device system comprising an active medical device having or connected to at least one electrode and circuitry connected to the electrode. The active medical device comprises a telemetry unit. The circuitry connected to the electrode comprises at least one single conductor that provides a radio frequency antenna for the telemetry unit. The implantable medical device system further comprises at least one electronic filter that is arranged between the single conductor of circuitry connected to the electrode and the telemetry unit. The least one electronic filter comprises at least one inductor having a core that comprises a ferromagnetic material with saturating behavior when exposed to an external magnetic field. ## Claims ### Claim 1 An implantable medical device system comprising an active medical device having or connected to at least one electrode and circuitry connected to the electrode, the system comprising: a telemetry unit; at lease one single conductor provided in the circuitry that is connected to the electrode, the at least one single conductor providing a radio frequency antenna for the telemetry unit; and at least one electronic filter arranged between the at least one single conductor and the telemetry unit, the at least one electronic filter comprising at least one inductor having a core or a bead that comprises a ferromagnetic material with saturating behavior when exposed to an external magnetic field. ### Claim 2 (depends on 1) The implantable medical device system according to claim 1, wherein the electronic filter is a high pass filter, a low pass filter or a band pass filter. ### Claim 3 (depends on 1) The implantable medical device system according to claim 1, wherein the electronic filter is arranged and configured to provide low attenuation of electromagnetic fields when the inductor core is not saturated and to provide high attenuation of electromagnetic fields when the inductor core is saturated. ### Claim 4 (depends on 3) The implantable medical device system according to claim 3, wherein the low attenuation is provided for RF magnetic or electromagnetic fields in a first frequency range and wherein the high attenuation is provided for RF magnetic or electromagnetic fields in a second frequency range. ### Claim 5 (depends on 4) The implantable medical device system according to claim 4, wherein the first frequency range has a lower limit of about 400 MHz. ### Claim 6 (depends on 4) The implantable medical device system according to claim 4, wherein the first frequency range encompasses a frequency subrange from 401 MHz to 457 MHz. ### Claim 7 (depends on 4) The implantable medical device system according to claim 4, wherein the second frequency range encompasses at least: a frequency of 128 MHz and/or at least one other frequency associated with the high frequency magnetic field of an MRI machine; or a frequency range from 120 MHz to 136 MHz; or a frequency range from 50 MHz to 150 MHz and/or a frequency range from 60 MHz to 68 MHz. ### Claim 8 (depends on 4) The implantable medical device system according to claim 4, wherein a level of low attenuation of the electronic filter is less than 20 dB and/or a level of high attenuation of the electronic filter is in the range of 20 dB or greater. ### Claim 9 (depends on 1) The implantable medical device system according to claim 1, wherein the electronic filter is a one pole filter or a multi pole filter. ### Claim 10 (depends on 1) The implantable medical device system according to claim 1, wherein the ferromagnetic material is a ferrite or a Mu-metal or a combination of both. ### Claim 11 (depends on 1) The implantable medical device system according to claim 1, wherein the core of the inductor is configured to saturate in a magnetic field with a magnetic flux density that amounts to a value between 1 mT and at least 150 mT. ### Claim 12 (depends on 1) The implantable medical device system according to claim 1, wherein the radio frequency antenna is adapted for wireless communication in a frequency range from 401 MHZ to 457 MHz, in particular according to the Medical Implant Communication Service specification or the Medical Device Radio-communications Service specification. ### Claim 13 (depends on 1) The implantable medical device system according to claim 1, wherein the implantable medical device system is connected to an implantable lead, and wherein the electronic filter is arranged at a proximal end of the implantable lead. ### Claim 14 (depends on 1) An active medical device for an implantable medical device system according to claim 1, wherein the active medical device has an input connectable to an electrode or circuitry connectable to an electrode or an implantable lead and comprises a telemetry unit, wherein the electronic filter is arranged between the input for the electrode or the circuitry connected to the electrode or the implantable lead and the telemetry unit. ### Claim 15 (depends on 1) The implantable lead for an implantable medical device system according to claim 1, wherein the implantable lead comprises a lead body, wherein the lead connector is arranged at a proximal end of the lead body, and wherein the electronic filter is arranged within the lead body close to the proximal end of the implantable lead or within the lead connector.