Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Thermal applicators
Patent
1992-03-06
1994-04-05
Pellegrino, Stephen C.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Thermal applicators
607102, 607116, 607143, 606 41, 604 20, A61B 1739
Patent
active
053000994
ABSTRACT:
A catheter shaft carries a coaxial cable, the terminal end of which contains a dipole antenna with opposing first and second helical elements. The first and second helical elements originate from a common connection to an outer conductor of the coaxial cable. The first and second helical elements are formed by winding flat wire around an outer insulator of the coaxial cable near a terminal end of the coaxial cable. A series capacitance is connected between an inner conductor of the coaxial cable and a point on the second helical element where the resistive component of the antenna's impedance matches the characteristic impedance of the coaxial cable. This match minimizes reflective losses of the antenna, thereby maximizing power transfer to the antenna. The antenna has an effective electrical length which is equal to one half the wavelength of the radiation emitted, independent of the physical length of the antenna. The antenna also has a radiation length which can be adjusted by varying the number and pitch of turns of the flat wire and the location of the impedance matching point. The microwave radiation emitted by the antenna is capable of generating a desired thermal pattern in biological tissue, within which temperatures are capable of exceeding 45.degree. C.
REFERENCES:
patent: 3568660 (1971-03-01), Crites et al.
patent: 4350168 (1982-09-01), Chable et al.
patent: 4841988 (1989-06-01), Fetter et al.
patent: 5026959 (1991-06-01), Ito et al.
Pellegrino Stephen C.
Schmidt Jeffrey A.
Urologix Inc.
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