# US 2021/0275219 A1 · Seal ring protection piece used for puncture outfit, end seal assembly and puncture outfit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0275219 A1 - Document ID: US20210275219A1 - Status: Published application - Kind: A1 - Application number: 16/609,985 - Filed: 2017-10-27 - Published: 2021-09-09 - Earliest claimed: 2016-10-31 - Inventors: Xing ZHOU - Web page: https://patentgrep.com/patent/US20210275219A1 ## CPC - A61B 17/3462: {with means for changing the diameter or the orientation of the entrance port of the cannula, e.g. for use with different-sized instruments, reduction ports, adapter seals (expandable cannulas A61B17/3417)} - A61B 17/00: Surgical instruments, devices or methods (A61B18/00 takes precedence; dental tools A61C3/00; eye surgery A61F9/007; ear surgery A61F11/20) - A61B 17/34: Trocars; Puncturing needles - A61B 2017/3464: {with means acting on inner surface of valve or seal for expanding or protecting, e.g. inner pivoting fingers} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A sealing ring protection sheet for a trocar of the present invention includes a positioning skirt, a support piece and a curved protection sheet. An upper end of the support piece is connected to an inner side of the positioning skirt, and a lower end of the support piece is connected to an upper end of the curved protection sheet. The curved protection sheet is of a curved and asymmetrical sheet-like structure, forming an easily deformable region and a protection region along two sides of a center line and its extension line of the positioning skirt separately. A left side and a right side of the curved protection sheet have different curvatures. The design of different curvatures of the left and right sides reduces resistance forces when various special-shaped instruments are inserted and removed. An end sealing assembly and the trocar of the present invention include the sealing ring protection sheet for a trocar of the present invention, capable of not only ensuring that a funnel-shaped sealing ring is not punctured by a surgical instrument in a surgical process, thereby ensuring a good sealing performance, but also reducing a moving resistance force, and particularly reducing a resistance force when various special-shaped surgical instruments are inserted and removed. ## Claims ### Claim at position 1 1-18. (canceled) ### Claim 19 A sealing ring protection sheet for a trocar comprising: a positioning skirt; a supporting piece; and a curved surface protection piece, wherein: A. the positioning skirt is a sheet-like structure, and is provided with a positioning hole and an inner side of the positioning skirt is connected to an upper end of the supporting piece; B. the support piece is a sheet-like structure, and an upper end thereof is connected to an inner side of the positioning skirt and a lower end thereof is connected to an upper end of the curved surface protection sheet; and C. the curved surface protection sheet is an asymmetrical sheet-like structure having a curved surface, further including a right oblique side, a bottom side, a left oblique side, an upper side, and a transition arc, and the right oblique side and the left oblique side are on both sides of the bottom edge, the curved surface protection sheet is suspended on the support piece, an upper edge of the curved surface protection sheet is connected to a lower end of the support piece. ### Claim 20 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: an included angle α between the curved protection sheet and the support piece is greater than or equal to 90°. ### Claim 21 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: an included angle β between the left bevel edge and the bottom edge is between 70° and 90°. ### Claim 22 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: the right bevel edge and the left bevel edge are asymmetrically distributed along a center line and its extension line of the positioning skirt. ### Claim 23 (depends on 22) The sealing ring protection sheet for a trocar according to claim 22, wherein: a furthest distance between the right bevel edge and the center line and its extension line of the positioning skirt is less than a furthest distance between the left bevel edge and the center line and its extension line of the positioning skirt. ### Claim 24 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: the curved protection sheet used in the sealing ring protection sheet of the trocar is disposed with an easily deformable region with a relatively weak deformation strength and a protection region with a relatively strong deformation strength, and a deformation resistance force of the easily deformable region is less than a deformation resistance force of the protection region. ### Claim 25 (depends on 24) The sealing ring protection sheet for a trocar according to claim 24, wherein: the easily deformable region is disposed on a right side of the curved protection sheet of the sealing ring protection sheet for a trocar, and the protection region is disposed on a left side of the curved protection sheet of the sealing ring protection sheet. ### Claim 26 (depends on 25) The sealing ring protection sheet for a trocar according to claim 25, wherein: a thickness of the easily deformable region is less than a thickness of the protection region. ### Claim 27 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: a funnel-shaped protection sheet assembly is formed by alternately stacking four or more sealing ring protection sheets. ### Claim 28 (depends on 27) The sealing ring protection sheet for a trocar according to claim 27, wherein: the funnel-shaped protection sheet assembly is formed by alternately stacking eight sealing ring protection sheets at 45°. ### Claim 29 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: a curvature of a left side portion of the curved protection sheet is different from that of a right side portion of the curved protection sheet. ### Claim 30 (depends on 29) The sealing ring protection sheet for a trocar according to claim 29, wherein: the curvature of the left side of the curved protection sheet is less than that of the right side of the curved protection sheet. ### Claim 31 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: the upper edge of the curved protection sheet comprises a right-side upper edge, a left-side upper edge; and the right-side upper edge is lower than the left-side upper edge. ### Claim 32 (depends on 19) The sealing ring protection sheet for a trocar according to claim 19, wherein: the positioning skirt is perpendicular to the support piece. ### Claim 33 (depends on 19) An end sealing assembly, wherein: the end sealing assembly comprises the sealing ring protection sheet for a trocar according to claim 19. ### Claim 34 (depends on 33) The end sealing assembly according to claim 33, wherein: the end sealing assembly comprises an upper pressing plate, a protection sheet, a corrugation sealing ring, a positioning seat, a funnel-shaped sealing ring and a lower pressing plate; eight protection sheets are mounted on positioning posts of the upper pressing plate through positioning holes, so that for two adjacent protection sheets, a right side of a curved protection sheet always presses a left side of a curved protection sheet of the adjacent protection sheet, the right side of the curved protection sheet is always in an upper layer, and the left side of the curved protection sheet is always in a lower layer, to thus form a circular funnel-shaped protection sheet assembly by alternately stacking the protection sheets in this manner; positioning holes of the corrugation sealing ring are sleeved on the positioning posts of the upper pressing plate, and the circular funnel-shaped protection sheet assembly is disposed between the corrugation sealing ring and the upper pressing plate; the positioning seat is provided with upper positioning holes and lower positioning holes, the positioning posts of the upper pressing plate are embedded in the upper positioning holes of the positioning seat, and the protection sheets and the corrugation sealing ring are sequentially disposed between the upper pressing plate and the positioning seat; and the funnel-shaped sealing ring is provided with positioning holes, the lower pressing plate is provided with positioning posts, the positioning posts of the lower pressing plate are embedded in the lower positioning holes of the positioning seat through the positioning holes of the funnel-shaped sealing ring, and the funnel-shaped sealing ring is disposed between the lower pressing plate and the positioning seat. ### Claim 35 (depends on 19) A trocar, wherein: the trocar comprises the sealing ring protection sheet for a trocar according to claim 19. ### Claim 36 (depends on 33, 35) The trocar according to claim 35, wherein: the trocar comprises the end sealing assembly according to claim 33.