# US 11,304,755 B2 · Microwave tissue ablation probe with non-metallic introducer set > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,304,755 B2 - Document ID: US11304755B2 - Status: Granted - Kind: B2 - Application number: 16/385,994 - Filed: 2019-04-16 - Published: 2019-10-24 - Granted: 2022-04-19 - Earliest claimed: 2018-04-18 - Assignees: Boston Scientific Scimed, Inc. - Applicants: Boston Scientific Scimed, Inc. - Inventors: Hong Cao; Kent David Harrison; Timothy A. Ostroot - Web page: https://patentgrep.com/patent/US11304755B2 ## CPC - A61B 18/1815: {using microwaves} - A61B 17/3403: {Needle locating or guiding means} - A61B 90/11: with guides for needles or instruments, e.g. arcuate slides or ball joints - A61B 17/04: for suturing wounds; Holders or packages for needles or suture materials - A61B 17/3415: {for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters (A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06)} - A61B 2017/00902: {transparent or translucent} - A61B 2017/00951: {adhesive} - A61B 2017/306: {holding by means of suction} - A61B 2017/308: {with suction cups} - A61B 2017/3407: {including a base for support on the body} - A61B 2017/3492: {against the outside of the body} - A61B 2018/00577: {Ablation} - A61B 2018/1823: {Generators therefor} - A61B 2018/1869: {with an instrument interstitially inserted into the body, e.g. needles} - A61B 2018/1884: {with non-uniform emissions} - A61B 2034/2051: {Electromagnetic tracking systems} - A61B 2034/2053: {Tracking an applied voltage gradient} - A61B 2090/3925: {ultrasonic} - A61B 2090/3966: {Radiopaque markers visible in an X-ray image} - A61B 2090/3983: {Reference marker arrangements for use with image guided surgery} - A61M 2025/0681: {Systems with catheter and outer tubing, e.g. sheath, sleeve or guide tube} - A61M 2205/0283: Electro-active polymers [EAP] - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract An introducer set for a microwave ablation probe is disclosed. The introducer set includes a cannula that is at least partially transparent to microwave energy, and a stylet sized to be received by the lumen of the cannula. Other examples provide a microwave ablation system including a microwave ablation probe having a radiating portion and a cannula that is at least partially transparent to microwave energy. The radiating portion of the probe aligns with the transparent portion of the cannula when the probe is inserted into the cannula lumen. The technology provides a method including introducing a microwave ablation probe into the lumen of a cannula having a cannula body that is at least partially transparent to microwave energy, aligning the transparent portion of the cannula with the radiating portion of the probe, and causing microwave energy to be emitted from the radiating portion of the probe. ## Claims ### Claim 1 An introducer set comprising: a microwave ablation probe having an elongated probe body and a radiating portion for emission of microwave energy at a distal portion of the probe body; a cannula comprising: a cannula body defining a lumen sized to receive the elongated probe body of the microwave ablation probe, wherein the cannula body comprises a non-metal portion constructed from a non-metallic material located along the cannula body such that the non-metal portion overlaps the radiating portion of the microwave ablation probe when the microwave ablation probe is inserted into the cannula; wherein the cannula body further comprises a metal portion constructed from a metallic material, the metal portion spanning a proximal portion along the cannula body from a proximal end to the non-metal portion, wherein the metal portion does not overlap with the non-metal portion; and a tissue-penetrating stylet sized to be received by the lumen of the cannula; wherein the microwave ablation probe is configured to be fully housed in the cannula and to radiate microwave energy through the non-metal portion of the cannula body. ### Claim 2 (depends on 1) The introducer set of claim 1, wherein the stylet or the cannula further comprises at least one of a navigational sensor and a navigational marker. ### Claim 3 (depends on 1) The introducer set of claim 1 wherein the stylet further comprises a trocar at a tip of the stylet, wherein the cannula is less rigid than the stylet, and wherein the cannula comprises a blunt tip. ### Claim 4 (depends on 1) The introducer set of claim 1, wherein the elongated probe body comprises a blunt tip. ### Claim 5 (depends on 1) The introducer set of claim 1 further comprising a fixation mechanism configured to fix a location of at least a part of the cannula within or to patient tissue, the fixation mechanism comprising a plurality of tines for anchoring the cannula to tissue. ### Claim 6 A microwave ablation system comprising: a microwave ablation probe having an elongated probe body and a radiating portion for emission of microwave energy at a distal portion of the probe body; and a cannula having: a cannula body comprising a first material that is not transparent to microwave energy; a lumen, and a window portion at a distal portion of the cannula body, the window portion comprising a material that is at least partially transparent to microwave energy; wherein the microwave ablation probe is configured to be fully housed in the cannula such that the window portion of the cannula body overlaps the radiating portion of the microwave ablation probe, and to radiate microwave energy through the window portion of the cannula body, wherein the window portion does not overlap with the first material. ### Claim 7 (depends on 6) The microwave ablation system of claim 6, further comprising an introducer set comprising the cannula and a tissue-penetrating stylet sized to be received in the lumen of the cannula. ### Claim 8 (depends on 6) The microwave ablation system of claim 6 further comprising a fixation mechanism for fixing a location of the cannula within patient tissue. ### Claim 9 (depends on 6) The microwave ablation system of claim 6 wherein the window portion of the cannula overlaps the radiating portion of the microwave ablation probe at the distal portion of the probe body. ### Claim 10 (depends on 6) The microwave ablation system of claim 6, further comprising a connector configured to fix a position of the microwave ablation probe in relation to the cannula when the microwave ablation probe is inserted in the lumen of the cannula. ### Claim 11 (depends on 10) The microwave ablation system of claim 10, wherein the connector fixes the radiating portion of the microwave ablation probe in a position adjacent to the window portion of the cannula. ### Claim 12 (depends on 6) The microwave ablation system of claim 6 wherein the window portion comprises a non-metallic material. ### Claim 13 (depends on 12) The microwave ablation system of claim 12 wherein the non-metallic material is a dielectric polymer. ### Claim 14 A microwave ablation method comprising: inserting a microwave ablation probe into a lumen of a cannula; aligning a radiating portion of the microwave ablation probe with a window portion of the cannula constructed from a material that is at least partially transparent to microwave energy; causing microwave energy to be emitted from the radiating portion of the microwave ablation probe through the window portion of the cannula with the microwave ablation probe fully housed in the cannula and the window portion of the cannula body overlapping the radiating portion of the microwave ablation probe; and blocking microwave radiation from radiating through a portion of the cannula constructed from a second material that is not transparent to microwave energy, wherein the window portion does not overlap with the second material. ### Claim 15 (depends on 14) The microwave ablation method of claim 14 further comprising: inserting a tissue-piercing stylet into the lumen of the cannula; piercing a body of tissue with the stylet while the stylet is inserted in the cannula lumen; fixing the cannula at a location in the body of tissue; removing the stylet from the cannula lumen; inserting the microwave ablation probe into the lumen of the cannula while the cannula is fixed at the location in the tissue; ablating the tissue with microwave energy emitted from the radiating portion of the microwave ablation probe. ### Claim 16 (depends on 15) The microwave ablation method of claim 15 further comprising: removing a biopsy sample of the tissue through the cannula lumen. ### Claim 17 (depends on 14) The microwave ablation method of claim 14 further comprising: fixing the microwave ablation probe to the cannula using a connector. ### Claim 18 (depends on 5) The introducer set of claim 5, wherein the plurality of tines are configured to be deployed from a retracted state in the tissue.