# US 2017/0281303 A1 · System and method for treating tissue using an expandable antenna

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- Number: US 2017/0281303 A1
- Document ID: US20170281303A1
- Status: Published application
- Kind: A1
- Application number: 15/623,622
- Filed: 2017-06-15
- Published: 2017-10-05
- Earliest claimed: 2012-01-06
- Assignees: Covidien LP
- Applicants: Covidien LP
- Inventors: ANTHONY C. LEE; KENLYN S. BONN; MANI N. PRAKASH; FRANCESCA ROSSETTO
- Web page: https://patentgrep.com/patent/US20170281303A1

## CPC

- A61B 18/1815: {using microwaves}
- A61B 2018/00214: {Expandable means emitting energy, e.g. by elements carried thereon}
- A61B 2018/00267: {having a basket shaped structure}
- A61B 2018/00577: {Ablation}
- A61B 2018/00601: {Cutting}
- A61B 2018/1861: {with an instrument inserted into a body lumen or cavity, e.g. a catheter}
- A61B 2018/1869: {with an instrument interstitially inserted into the body, e.g. needles}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An ablation device includes an antenna assembly having a radiating portion configured to deliver energy from a power source to tissue of a patient. The radiating portion has an outer conductor and an inner conductor extending therethrough. The inner conductor is disposed within the outer conductor and defines a longitudinal axis. One of the inner conductor and the outer conductor is movable relative to the other to cause at least a portion of the outer conductor to expand radially relative to the longitudinal axis.

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

An electrosurgical system for treating tissue, the system comprising:
an electrosurgical generator; and
a microwave ablation device configured to operably couple to the electrosurgical generator, the microwave ablation device including:
a radiating portion defining a longitudinal axis and configured to deliver energy from the electrosurgical generator to tissue, the radiating portion having an outer conductor and an inner conductor disposed within the outer conductor and separated by a dielectric material disposed on the inner conductor;
wherein one of the inner conductor or the outer conductor is movable relative to the other to cause at least a portion of the outer conductor to expand radially relative to the longitudinal axis.

### Claim 22 (depends on 21)

The electrosurgical system according to claim 21, wherein the microwave ablation device includes a distal tip coupled to at least one of the outer conductor or the inner conductor and proximal movement of the distal tip causes at least a portion of the outer conductor to expand radially relative to the longitudinal axis.

### Claim 23 (depends on 21)

The electrosurgical system according to claim 21, wherein the outer conductor is configured to separate into a plurality of deployable conductors in response to proximal movement of one of the inner conductor or the outer conductor relative to the other.

### Claim 24 (depends on 21)

The electrosurgical system according to claim 21, wherein the microwave ablation device includes a distal tip operably coupled to the inner conductor such that movement of the inner conductor along the longitudinal axis translates relative movement of the distal tip.

### Claim 25 (depends on 21)

The electrosurgical system according to claim 21, wherein at least a portion of the outer conductor is flexible.

### Claim 26 (depends on 23)

The electrosurgical system according to claim 23, wherein each deployable conductor of the plurality of deployable conductors is configured to mechanically cut through tissue.

### Claim 27 (depends on 23)

The electrosurgical system according to claim 23, wherein each deployable conductor of the plurality of deployable conductors is configured to cut through tissue upon delivery of electrosurgical energy to the plurality of deployable conductors.

### Claim 28 (depends on 23)

The electrosurgical system according to claim 23, wherein a distance between the plurality of deployable conductors and the inner conductor defines an ablation region when the plurality of deployable conductors is radially expanded relative to the longitudinal axis.

### Claim 29 (depends on 28)

The electrosurgical system according to claim 28, wherein the outer conductor and the inner conductor are configured to form an electromagnetic field within the ablation region.

### Claim 30 (depends on 21)

The electrosurgical system according to claim 21, wherein distal movement of the outer conductor relative to the inner conductor causes at least a portion of the outer conductor to expand radially relative to the longitudinal axis.

### Claim 31 (depends on 21)

The electrosurgical system according to claim 21, wherein proximal movement of the inner conductor relative to the outer conductor causes at least a portion of the outer conductor to expand radially relative to the longitudinal axis.

### Claim 32 (depends on 21)

The electrosurgical system according to claim 21, wherein the microwave ablation device includes a housing having an actuation element, the actuation element operably coupled to at least one of the inner conductor or the outer conductor and configured to move one of the inner conductor or the outer conductor relative to the other.

### Claim 33 (depends on 21)

The electrosurgical system according to claim 21, further comprising a sealant disposed around at least a distal portion of the outer conductor, wherein radial expansion of the outer conductor causes corresponding radial expansion of the sealant.