THIN-SLEEVE APPARATUS FOR REDUCING RF COUPLING OF DEVICES IN MRI ENVIRONMENTS
First Claim
Patent Images
1. An RF shield, comprising:
- elongated inner and outer conductive tubes, each having respective opposite first and second end portions; and
an elongated dielectric layer of MRI compatible material sandwiched between the inner and outer conductive tubes and surrounding the inner conductive tube, wherein only the respective first end portions of the inner and outer conductive tubes are electrically connected, and wherein the second end portions are electrically isolated.
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Abstract
An RF shield for medical interventional devices includes elongated inner and outer conductive tubes, and an elongated dielectric layer of MRI compatible material sandwiched between the inner and outer conductive tubes and surrounding the inner conductor. The inner and outer conductive tubes are electrically connected to each other at only one of the adjacent end portions thereof. The opposite respective end portions are electrically isolated from each other.
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Citations
21 Claims
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1. An RF shield, comprising:
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elongated inner and outer conductive tubes, each having respective opposite first and second end portions; and an elongated dielectric layer of MRI compatible material sandwiched between the inner and outer conductive tubes and surrounding the inner conductive tube, wherein only the respective first end portions of the inner and outer conductive tubes are electrically connected, and wherein the second end portions are electrically isolated. - View Dependent Claims (2, 3, 4)
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5. A thin-sleeve medical device, comprising:
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an elongated sheath having a distal end, an opposite proximal end, and a central lumen extending between the proximal and distal ends; and at least one RF shield coaxially disposed within the elongated sheath and surrounding a portion of the central lumen, the at least one RF shield comprising; elongated inner and outer conductors, each having respective opposite first and second end portions; and an elongated dielectric layer of MRI compatible material sandwiched between the inner and outer conductors and surrounding the inner conductor, wherein only the respective first end portions of the inner and outer conductors are electrically connected, and wherein the second end portions are electrically isolated. - View Dependent Claims (6, 7, 8, 9)
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10. A thin-sleeve medical device, comprising:
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an elongated sheath having a distal end, an opposite proximal end, and a central lumen extending between the proximal and distal ends; and at least one RF shield coaxially surrounding a portion of the sheath, the at least one RF shield comprising; elongated inner and outer conductors, each having respective opposite first and second end portions; and an elongated dielectric layer of MRI compatible material sandwiched between the inner and outer conductors and surrounding the inner conductor, wherein only the respective first end portions of the inner and outer conductors are electrically connected, and wherein the second end portions are electrically isolated. - View Dependent Claims (11, 12, 13, 14)
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15. A method of reducing RF coupling in an MRI environment, the method comprising:
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providing an elongate sheath, wherein the sheath has a distal end, an opposite proximal end, and a central lumen extending between the proximal and distal ends, and wherein the sheath includes at least one RF shield coaxially disposed therewithin and surrounding a portion of the central lumen; and introducing a conductive device into the central lumen, wherein the at least one RF shield inhibits RF currents from being induced along or within the conductive device by a magnetic field of an MRI scanner. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification