# US 10,765,451 B2 · Retractor for small-incision endoscopic surgery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,765,451 B2 - Document ID: US10765451B2 - Status: Granted - Kind: B2 - Application number: 16/319,908 - Filed: 2017-07-21 - Published: 2019-09-05 - Granted: 2020-09-08 - Earliest claimed: 2016-07-25 - Assignees: Osaka City University; Ozk Co., Ltd.; Shinwa Syoji Co., Ltd. - Applicants: Osaka City University; Ozk Co., Ltd.; Shinwa Syoji Co., Ltd. - Inventors: Toshihiko Shibata; Haruhiko Yamasaki; Katsunori Mitsuhashi; Yoshiro Morishita - Web page: https://patentgrep.com/patent/US10765451B2 ## CPC - A61B 17/3431: {being collapsible, e.g. made of thin flexible material (A61B17/3423 takes precedence)} - A61B 17/02: for holding wounds open, e.g. retractors; Tractors - A61B 17/0218: {for minimally invasive surgery (A61B17/0281, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)} - A61B 17/3417: {Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating (syringe needles A61M5/32; dilators A61M29/00)} - A61M 29/00: Dilators with or without means for introducing media, e.g. remedies - A61B 17/3439: {with means for changing the inner diameter of the cannula, e.g. expandable (A61B17/3423, A61B17/3431 take precedence; catheters A61M25/0662)} - A61B 2017/00858: {high friction or non-slip} - A61B 2017/00946: {malleable} - A61B 2017/0225: {flexible, e.g. fabrics, meshes, or membranes} - A61B 2017/348: {Means for supporting the trocar against the body or retaining the trocar inside the body} - 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 A retractor holds a surgical incision in a body in an opened state to ensure a surgical field in small-incision endoscopic surgery, and includes a base body that is a thin plate made of tin having a purity of not less than 99.9% and has an elongated rectangular shape in an extended state of the base body. The retractor, in an extended form in a rectangular shape or in a rounded form in a small shape, can be inserted from a small incision wound into the body, and can easily be delivered to the surgical incision in the body by a surgical instrument. The base body is bent and deformed into a desired shape by the surgical instrument and is applied to the surgical incision in the body, so that the surgical incision can be held in an opened state so as to ensure the surgical field. ## Claims ### Claim 1 A retractor for small-incision endoscopic surgery, the retractor holding a surgical incision made in a body during the surgery in an opened state to ensure a surgical field in the small-incision endoscopic surgery, the retractor comprising a base body that is a thin plate made of tin having a purity of not less than 99.9%, and has an elongated rectangular shape in an extended state of the base body, wherein the base body does not include a window, and wherein a width of the base body is selected in a range of 1 to 5 cm and a length of the base body is selected in a range of 3 to 20 cm, in accordance with a size required for a use place, in a state that the base body is extended into a rectangular shape, in order to hold the surgical incision in an opened state; and then a thickness of the base body is selected in a range of 0.5 to 2 mm, in order to ensure flexural rigidity necessary for the use place, the retractor is inserted from a small incision wound into the body, with the base body being extended into a rectangular shape, or being rounded into a small shape, and the retractor is delivered to the surgical incision in the body by a surgical instrument used in the small-incision endoscopic surgery, and is used in a state that the base body is bent and deformed into a desired form by the surgical instrument and is applied to the surgical incision. ### Claim 2 (depends on 1) The retractor for small-incision endoscopic surgery according to claim 1, wherein a bent portion bent in a loop shape about an axis parallel to a short direction of the base body is provided in an end portion in a longitudinal direction of the base body, in a state that the base body is extended into the rectangular shape. ### Claim 3 The retractor for small-incision endoscopic surgery according to claim I, wherein a tubular body having a through-hole parallel to a short direction of the base body is provided in an end portion in a longitudinal direction of the base body, in a state that the base body is extended into the rectangular shape. ### Claim 4 (depends on 1) The retractor for small-incision endoscopic surgery according to claim 1, wherein the base body has, on one or both surfaces thereof, an anti-slip protrusion. ### Claim 5 (depends on 1) The retractor for small-incision endoscopic surgery according to claim 1, wherein the base body is deformed into a cylindrical shape, and has protrusions arranged in a helical manner on a cylindrical face of the cylindrical shape. ### Claim 6 (depends on 1) The retractor for small-incision endoscopic surgery according to claim 1, wherein a through-hole in a thickness direction of the base body is provided in an end portion in a longitudinal direction of the base body, in a state that the base body is extended into the rectangular shape. ### Claim 7 A retractor for small-incision endoscopic surgery, the retractor holding a surgical incision made in a body during the surgery in an opened state to ensure a surgical field in the small-incision endoscopic surgery, the retractor comprising: a base body that is a thin plate made of tin having a purity of not less than 99.9%, and has an elongated rectangular shape in an extended state of the base body, wherein the base body does not include a window; a width of the base body is selected in a range of 1 to 5 cm and a length of the base body is selected in a range of 3 to 20 cm, in accordance with a size required for a use place, in a state that the base body is extended into a rectangular shape, in order to hold the surgical incision in an opened state; and then a thickness of the base body is selected in a range of 0.5 to 2 mm, in order to ensure flexural rigidity necessary for the use place, and a fixing means configured to fix a leading end portion of a surgical hook to the base body, wherein the retractor is inserted from a small incision wound into the body, with the base body being extended into a rectangular shape, or being rounded into a small shape, in a state that the leading end portion of the surgical hook is fixed to the base body by the fixing means to hold the retractor by the surgical hook, and the retractor is delivered to the surgical incision in the body by the surgical hook, and is used in a state that the base body is bent and deformed into a desired form by a surgical instrument used in the small-incision endoscopic surgery, and is applied to the surgical incision. ### Claim 8 (depends on 7) The retractor for small-incision endoscopic surgery according to claim 7, wherein a bent portion bent in a loop shape about an axis parallel to a short direction of the base body is provided in an end portion in a longitudinal direction of the base body, in a state that the base body is extended into the rectangular shape. ### Claim 9 (depends on 7) The retractor for small-incision endoscopic surgery according to claim 7, wherein a tubular body having a through-hole parallel to a short direction of the base body is provided in an end portion in a longitudinal direction of the base body, in a state that the base body is extended into the rectangular shape. ### Claim 10 (depends on 7) The retractor for small-incision endoscopic surgery according to claim 7, wherein the base body has, on one or both surfaces thereof, an anti-slip protrusion. ### Claim 11 (depends on 7) The retractor for small-incision endoscopic surgery according to claim 7, wherein the base body is deformed into a cylindrical shape, and has protrusions arranged in a helical manner on a cylindrical face of the cylindrical shape.