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US 11,759,256 B2Granted
Microwave energy transfer component for electrosurgical apparatus
AssigneeCreo Medical Limited
InventorsChristopher Paul Hancock, Malcolm White, Shaun Preston
Life of this patent
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Abstract
A microstrip impedance transformer that permits efficient (i.e. low loss) coupling of a microwave feed line (e.g. a conventional 50Ω coaxial cable) to an instrument cable, where the instrument cable has a lower impedance (e.g. in the range 12 to 14Ω) and includes an internal passageway. The microstrip impedance transformer is configured to perform impedance matching between the microwave feed line and the instrument cable in a manner that does not adversely affect a separate feed, e.g. for delivering fluid, into the internal passageway.
Claims20
An electrosurgical apparatus comprising:
- a microwave feed line for carrying microwave electromagnetic (EM) energy having a frequency from an electrosurgical generator;
- an instrument cable for insertion into a patient's body to a treatment site, the instrument cable comprising:
- a coaxial transmission line for conveying the microwave EM energy, and
- an internal passageway for providing access to the treatment site;
- and
- a junction formed between a distal end of the microwave feed line and a proximal end of the instrument cable, wherein the junction is configured to transfer the microwave EM energy directly between the distal end of the microwave feed line and the proximal end of the instrument cable,
- wherein the microwave feed line has a first impedance at the frequency of the microwave EM energy,
- wherein the instrument cable has a second impedance at the frequency of the microwave EM energy, the second impedance being lower than the first impedance, and
- wherein the junction comprises:
- a microstrip impedance transformer configured to match the first impedance and the second impedance, the microstrip impedance transformer being directly connected to the distal end of the microwave feed line and the proximal end of the instrument cable;
- and
- a hollow conduit in fluid communication with the internal passageway for conveying fluid to the treatment site.
9 more elements
Dependencies are inferred from the claim text.