MRT optocoupler

摘要

Device and method for detecting electromagnetic fields occurring in imaging magnetic resonance tomography MRT/MRI tests. Relates to an implantable medical device (IMD) comprising a hermetically sealed housing, control unit(s), detection unit(s) for MRT interference fields connected/connectable to control unit(s) and to electrode(s) and/or to antenna(s) and/or coil(s), wherein the MRT interference detection unit contains at least one electro-optical converter which converts induced voltages from the electrode(s) and/or the antenna(s) and/or the coil(s) to optical signals, which are optically transmitted in a potential-free manner within the detection unit for MRT interference fields to an evaluation unit for the detection unit for MRT interference fields, and when a threshold for the optical signal and/or a predetermined periodic occurrence of the optical signals is exceeded, the evaluation unit triggers switching to an MRI-safe state or transmits a corresponding signal to the control unit(s).

主权项

1. An implantable medical device comprising:
a hermetically sealed housing; at least one control unit situated within said hermetically sealed housing; at least one conducting element coupled with said implantable medical device wherein said at least one conducting element comprises any combination of one or more of
at least one electrode,at least one antenna,at least one coil; at least one detection unit configured to detect magnetic resonance tomography interference fields which is connected to the at least one control unit and to said at least one conducting element; an evaluation unit coupled with the at least one detection unit; wherein the at least one detection unit contains
at least one electro-optical converter configured to convert induced voltages for said magnetic resonance tomography interference fields from said at least one conducting element to optical signals, which are optically transmitted in a potential-free manner within the detection unit to the evaluation unit; and, wherein when one or more of a threshold for the optical signals and a predetermined periodic occurrence of the optical signals is exceeded, the evaluation unit is configured to trigger the implantable medical device to switch to a magnetic resonance imaging-safe state.