Implantable helical coil microwave antenna
First Claim
1. An implantable helical coil microwave antenna for improving localization of interstitial hyperthermia comprisingan inner conductor,a dielectric insulator covering said inner conductor,an outer conductor covering only a proximal portion of said insulator to form a coaxial cable thereat and to leave a distal portion of said insulator uncovered, anda helical coil means surrounding the distal portion of said insulator and having a proximal end spaced axially from a distal end of said outer conductor to form a separation gap therebetween and a distal end of said coil means connected to a distal end of said inner conductor for confining heat to immediate areas surrounding said coil means and for inducing substantially identical thermal profiles at varying depths of insertion of said antenna into an organic subject when said antenna is energized with microwave energy.
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Accused Products
Abstract
An implantable helical coil microwave antenna, particularly adapted for interstitial hyperthermia therapy of cancer, comprises a coaxial cable having a distal end of its outer conductor removed and a helical coil mounted on the exposed inner conductor insulator. A proximal end of the helical coil is separated axially from the distal end of the outer conductor and the distal end of the helical coil is connected to the inner conductor of the coaxial cable feed line. The antenna functions to confine heat to the area immediately surrounding the coil and thus induces substantially identical thermal profiles at varying antenna insertion depths in tissue when the antenna is energized with microwave energy.
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Citations
12 Claims
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1. An implantable helical coil microwave antenna for improving localization of interstitial hyperthermia comprising
an inner conductor, a dielectric insulator covering said inner conductor, an outer conductor covering only a proximal portion of said insulator to form a coaxial cable thereat and to leave a distal portion of said insulator uncovered, and a helical coil means surrounding the distal portion of said insulator and having a proximal end spaced axially from a distal end of said outer conductor to form a separation gap therebetween and a distal end of said coil means connected to a distal end of said inner conductor for confining heat to immediate areas surrounding said coil means and for inducing substantially identical thermal profiles at varying depths of insertion of said antenna into an organic subject when said antenna is energized with microwave energy.
Specification