# US 2014/0194865 A1 · Microwave Surgical Instrument > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194865 A1 - Document ID: US20140194865A1 - Status: Published application - Kind: A1 - Application number: 14/238,167 - Filed: 2012-08-09 - Published: 2014-07-10 - Earliest claimed: 2011-08-10 - Assignees: National University Corporation Shiga University of Medical Science - Inventors: Tohru Tani; Shigeyuki Naka; Hisanori Shiomi - Web page: https://patentgrep.com/patent/US20140194865A1 ## CPC - A61B 18/1815: {using microwaves} - A61B 2018/00446: {Brain} - A61B 2018/00589: {Coagulation} - A61B 2018/0063: {Sealing} - A61B 2018/1838: {Dipole antennas} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract It is an object to provide a surgical instrument capable of locally applying microwaves to a minute biological tissue. It has been found that microwaves can be transmitted to a tip of a tapered coaxial body (9) and that microwaves are radiated from the entire central conductor exposed in a major axis direction by decreasing a sectional area (preferably diameter) of a central conductor (1) and a sectional area (preferably inner diameter) of an external conductor gradually or in a step-by-step manner with a ratio between the sectional area (diameter) of the central conductor (1) and the sectional area (inner diameter) of the external conductor being set to be constant, thereby achieving the present invention. ## Claims ### Claim at position 1 1-31. (canceled) ### Claim 32 A microwave surgical instrument comprising: (a) a microwave transmitting section comprising: (i) a coaxial cable; and (ii) an internal conductor; and (b) a coaxial body comprising: (i) a central conductor connected to said microwave transmitting section and to said internal conductor of said microwave transmitting section, (ii) an insulator covering at least a portion of said central conductor, (iii) an external conductor covering at least a portion of said insulator, (iv) a biological tissue contact section comprising: said central conductor that is not covered with said insulator, and said external conductor, wherein said biological tissue contact section is exposed in a major axis direction, and wherein a sectional area of a tip of said coaxial body is smaller than a sectional area of a portion connected to said microwave transmitting section of said coaxial body. ### Claim 33 (depends on 32) The microwave surgical instrument according to claim 32, wherein a sectional shape of said central conductor of the tip of said coaxial body and a sectional shape of the external conductor of the tip of said coaxial body are circular shapes. ### Claim 34 (depends on 33) The microwave surgical instrument according to claim 33, wherein a ratio between a diameter of the central conductor of the tip of said coaxial body and a diameter of the central conductor of the portion connected to said microwave transmitting section is substantially the same as a ratio between an inner diameter of said external conductor of the tip of said coaxial body and an inner diameter of the external conductor of the portion connected to said microwave transmitting section. ### Claim 35 (depends on 32) The microwave surgical instrument according to claim 32 further comprising a support for supporting said coaxial body. ### Claim 36 (depends on 32) The microwave surgical instrument according to claim 32, wherein said instrument comprises a plurality of said biological tissue contact sections. ### Claim 37 (depends on 36) The microwave surgical instrument according to claim 36, wherein said instrument comprises two opposed biological tissue contact sections. ### Claim 38 (depends on 32) The microwave surgical instrument according to claim 32, wherein said biological tissue contact section comprises two insulator surfaces forming a reflex angle or a minor angle. ### Claim 39 (depends on 32) The microwave surgical instrument according to claim 32 further comprising a pull-in tube for storing said microwave transmitting section, wherein said biological tissue contact section is configured to be pulled in and out of said pull-in tube. ### Claim 40 (depends on 36) The microwave surgical instrument according to claim 36, wherein tips of two said biological tissue contact sections are directly or indirectly connected to each other. ### Claim 41 (depends on 40) The microwave surgical instrument according to claim 40, wherein the tips of said two biological tissue contact sections are connected to each other via a wire. ### Claim 42 A microwave surgical instrument, comprising: (i) a microwave transmitting section comprising: a coaxial cable comprising an internal conductor; (ii) a coaxial body comprising: (a) a central conductor connected to said microwave transmitting section and to said internal conductor, (b) an insulator covering at least a portion of said central conductor, (c) an external conductor covering at least a portion of said insulator, (d) a biological tissue contact section comprising: an exposed section of central conductor, an insulator surface on both sides of said exposed section of central conductor, and an external conductor end substantially parallel to said exposed section of central conductor, wherein said external conductor end being located on outside of said insulator surface; and (iii) a support for supporting said coaxial body. ### Claim 43 (depends on 42) The microwave surgical instrument according to claim 42, wherein a ratio between a diameter of said central conductor at a tip of said coaxial body and a diameter of said central conductor connected to said microwave transmitting section is substantially the same as a ratio between an inner diameter of said external conductor at the tip of said coaxial body and an inner diameter of said external conductor connected to said microwave transmitting section. ### Claim 44 (depends on 42) The microwave surgical instrument according to claim 42, wherein said instrument comprises a plurality of said biological tissue contact sections. ### Claim 45 (depends on 44) The microwave surgical instrument according to claim 44, wherein said plurality of biological tissue contact sections are juxtaposed to each other. ### Claim 46 (depends on 42) The microwave surgical instrument according to claim 42, wherein said instrument comprises two biological tissue contact sections opposed to each other. ### Claim 47 (depends on 42) The microwave surgical instrument according to claim 42 further comprising a sealing unit for sealing a biological tissue. ### Claim 48 (depends on 42) The microwave surgical instrument according to claim 42 further comprising a jaw opposed to the biological tissue contact section in which an angle formed by two insulator surfaces is 270° or more. ### Claim 49 (depends on 42) The microwave surgical instrument according to claim 42, wherein said instrument comprises two biological tissue contact sections that are opposed to each other and having external conductor ends that are connected to each other. ### Claim 50 (depends on 42) The microwave surgical instrument according to claim 42, wherein said support comprises a surgical instrument, and wherein said coaxial body is proximate to and substantially parallel with an edge or a blade edge line of said surgical instrument. ### Claim 51 (depends on 50) The microwave surgical instrument according to claim 50, wherein said biological tissue contact section of said coaxial body comprises two insulator surfaces forming an acute angle. ### Claim 52 (depends on 50) The microwave surgical instrument according to claim 50, wherein said insulator surface is attached to said surgical instrument.