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US 12,648,812 B2Granted
Fluid-cooled energy-delivery device
AssigneeCovidien LP
InventorJoseph D. Brannan
Life of this patent
Estimating the term…
Abstract
An energy-delivery device suitable for delivery of energy to tissue includes an antenna assembly, a chamber defined about the antenna assembly, and a cable having a proximal end suitable for connection to an electrosurgical energy source. The energy-delivery device also includes a flexible, fluid-cooled shaft coupled in fluid communication with the chamber. The flexible, fluid-cooled shaft is configured to contain a length of the cable therein and adapted to remove heat along the length of the cable during delivery of energy to the antenna assembly.
Claims16
A microwave ablation device, comprising:
- a housing;
- an outer tubular member defining a first fluid conduit;
- an inner tubular member coaxially surrounded by the outer tubular member and defining a second fluid conduit;
- a feedline coaxially disposed within the inner tubular member, the feedline having an inner conductor and an outer conductor coaxially surrounding the inner conductor, and a dielectric material disposed between the inner and outer conductors, wherein the outer conductor is out of electromechanical contact with the inner tubular member;
- an electrically insulative end cap disposed at a distal end of the outer tubular member and configured to be inserted into tissue, the electrically insulative end cap coupled to the outer tubular member by a connector portion having an outer surface attached to an inner surface of the outer tubular member, wherein the first fluid conduit includes a fluid chamber defined by the electrically insulative end cap such that the electrically insulative end cap narrows a portion of the first fluid conduit and the portion of the first fluid conduit that is narrowed by the electrically insulative end cap is surrounded by the connector portion;
- and
- a radiating portion disposed at a distal end portion of the feedline and configured to radiate microwave energy, the radiating portion having a distal end disposed within the fluid chamber defined by the electrically insulative end cap, wherein a portion of the radiating portion is surrounded by the connector portion, and wherein the radiating portion is immersed in fluid and out of physical contact with the electrically insulative end cap and the outer tubular member.
4 more elements
A fluid-cooled shaft for a microwave ablation device, comprising:
- an outer tubular member defining a fluid outflow conduit;
- an inner tubular member defining a fluid inflow conduit, the inner tubular member having a coaxial cable received within the fluid inflow conduit, the coaxial cable having an inner conductor and an outer conductor coaxially surrounding the inner conductor, wherein the outer conductor is out of electromechanical contact with the inner tubular member;
- an end cap disposed at a distal end of the outer tubular member and configured to be inserted into tissue, the end cap coupled to the outer tubular member by a connector portion having an outer surface attached to an inner surface of the outer tubular member, wherein the fluid outflow conduit includes a fluid chamber defined by the end cap such that the end cap narrows a portion of the fluid outflow conduit and the portion of the fluid outflow conduit that is narrowed by the end cap is surrounded by the connector portion;
- and
- a radiating portion configured to radiate microwave energy, the radiating portion having a distal end disposed within the fluid chamber defined by the end cap, wherein a portion of the radiating portion is surrounded by the connector portion, and wherein the radiating portion is immersed in fluid and out of physical contact with the end cap and the outer tubular member.
2 more elements
A microwave antenna assembly, comprising:
- a housing;
- an outer tubular member extending distally from the housing and defining a lumen;
- an inner tubular member extending through the lumen defined by the outer tubular member;
- a feedline disposed within the inner tubular member, the feedline including an inner conductor, an outer conductor, and a dielectric disposed between the inner conductor and the outer conductor, wherein the outer conductor is out of electromechanical contact with the inner tubular member;
- a first fluid lumen defined between an inner surface of the outer tubular member and an outer surface of the inner tubular member;
- a second fluid lumen defined between an inner surface of the inner tubular member and an outer surface of the feedline;
- an end cap disposed at a distal end of the outer tubular member and configured to be inserted into tissue, wherein the first fluid lumen includes a fluid chamber defined by the end cap such that the end cap narrows a portion of the first fluid lumen, and wherein the end cap is coupled to the outer tubular member by a connector portion disposed within the lumen defined by the outer tubular member and having an outer surface attached to an inner surface of the outer tubular member, and wherein the portion of the fluid outflow conduit that is narrowed by the end cap is surrounded by the connector portion;
- a radiating portion operably coupled to the inner conductor of the feedline and configured to radiate microwave energy, the radiating portion having a distal end disposed within the fluid chamber defined by the end cap, wherein a portion of the radiating portion is surrounded by the connector portion, and wherein the radiating portion is fully immersed in fluid and out of physical contact with the end cap and the outer tubular member;
- and
- a balun positioned relative to the feedline and configured to limit propagation of the microwave energy.
7 more elements
Dependencies are inferred from the claim text.