Enhanced safety coaxial cables
First Claim
1. An induced RF current inhibiting coaxial cable comprisingan induced RF current inhibiting an elongated axially oriented inner conductor, an axially oriented outer shield conductor disposed in spaced surrounding relationship with respect to said inner conductor, a first dielectric material interposed between said inner conductor and said outer shield conductor, said outer shield conductor having an annular inner shield portion and segmented outer shield portions, electrically conductive means electrically connecting said inner shield portion to said segmented outer shield portions, a second dielectric material interposed between said segmented outer shield portions and said inner shield portion, and said second dielectric material having a higher dielectric constant than said first dielectric material.
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Accused Products
Abstract
A coaxial cable which may be a magnetic resonance imaging coaxial cable is designed for enhanced safety so as to reduce the risk of excessive heating or burns to a user. The cable has an elongated axially oriented inner conductor and an axially oriented outer shield conductor in spaced relationship with respect thereto with a first dielectric material disposed therebetween. The outer shield conductor has an annular inner shield portion and segmented outer shield portions which are electrically connected to the inner shield portion. In certain preferred embodiments, a second dielectric material having a higher dielectric constant than the first dielectric material is disposed between the inner shield portion and the segmented outer shield portions. In one embodiment, an electrically conductive element extends between the segmented outer shield portions and the inner shield portion and terminates in spaced relationship therewith. In another embodiment, a capacitor may be introduced between the inner shield portion and the segmented outer shield portions.
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Citations
15 Claims
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1. An induced RF current inhibiting coaxial cable comprising
an induced RF current inhibiting an elongated axially oriented inner conductor, an axially oriented outer shield conductor disposed in spaced surrounding relationship with respect to said inner conductor, a first dielectric material interposed between said inner conductor and said outer shield conductor, said outer shield conductor having an annular inner shield portion and segmented outer shield portions, electrically conductive means electrically connecting said inner shield portion to said segmented outer shield portions, a second dielectric material interposed between said segmented outer shield portions and said inner shield portion, and said second dielectric material having a higher dielectric constant than said first dielectric material.
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13. A coaxial cable comprising
an elongated axially oriented inner conductor, an axially oriented outer shield conductor disposed in spaced surrounding relationship with respect to said inner conductor, a first dielectric material interposed between said inner conductor and said outer shield conductor, said outer shield conductor having an annular inner shield portion and segmented outer shield portions, electrically conductive means electrically connecting said inner shield portion to said segmented out shield portions, a second dielectric material interposed between said segmented outer shield portions and said inner shield portion, said coaxial cable being a magnetic resonance coaxial cable, and generally inwardly projecting portions extending from said segmented outer shield portions toward said inner shield portion and terminating in spaced relationship with respect to said inner shield portion.
Specification