| 主权项 |
1. A dielectric spacer comprising:
a housing configured to be disposed about a microwave needle, the microwave needle at least partially insertable in tissue, the housing having a predetermined thickness, an upper surface, a skin-contacting bottom surface, and a first predetermined dielectric permittivity, the housing defining a first space therein, the first space including a dielectric material having a second predetermined dielectric permittivity, the housing including at least one second space separated from the first space by a barrier, the at least one second space defining an aperture through the upper surface of the housing and the skin-contacting bottom surface, the at least one aperture shaped to engage an outer surface of the at least one microwave needle, wherein the thickness of the housing, the first dielectric permittivity of the housing, and the second dielectric permittivity of the dielectric material are configured to reduce an amplitude of a standing wave proximate the tissue surface when the microwave needle is at least partially inserted into tissue. |
