Device and method for preventing magnetic-resonance imaging induced damage
First Claim
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1. A medical assist system, comprising:
- a primary device housing;
said primary device housing having a control circuit therein;
a lead system to provide an electrical path between a tissue region and said primary device housing;
a shielding formed around said lead system to shield said lead system from electromagnetic interference; and
a filter, connected to said lead system, to attenuate any induced RF signal and passing a desired electrical physiological signal;
said filter including, a shield enclosing said filter, and a low pass filter connected to said lead system;
said shielding being patterned with non-conductive materials and conductive materials.
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Abstract
An electromagnetic shield has a first patterned or apertured layer having non-conductive materials and conductive material and a second patterned or apertured layer having non-conductive materials and conductive material. The conductive material may be a metal, a carbon composite, or a polymer composite. The non-conductive materials in the first patterned or apertured layer may be randomly located or located in a predetermined segmented pattern such that the non-conductive materials in the first patterned or apertured layer are located in a predetermined segmented pattern with respect to locations of the non-conductive materials in the second patterned or apertured layer.
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Citations
32 Claims
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1. A medical assist system, comprising:
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a primary device housing;
said primary device housing having a control circuit therein;
a lead system to provide an electrical path between a tissue region and said primary device housing;
a shielding formed around said lead system to shield said lead system from electromagnetic interference; and
a filter, connected to said lead system, to attenuate any induced RF signal and passing a desired electrical physiological signal;
said filter including, a shield enclosing said filter, and a low pass filter connected to said lead system;
said shielding being patterned with non-conductive materials and conductive materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A medical assist system, comprising:
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a primary device housing;
said primary device housing having a control circuit therein;
a lead system to provide an electrical path between a tissue region and said primary device housing;
a shielding formed around said lead system to shield said lead system from electromagnetic interference; and
a filter, connected to said lead system, to attenuate any induced RF signal and passing a desired electrical physiological signal;
said filter including, a shield enclosing said filter, and a low pass filter connected to said lead system;
said shielding being an apertured conductive material having a maximum aperture dimension of 0.01 millimeters to 10 millimeters. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification