Cannula sealing assembly and puncture outfit

Abstract

The cannula sealing assembly comprises a shell body and a cover body, a cavity is formed between the shell body and the cover body, a sealing piece is arranged in the cavity and comprises a first sealing sleeve, a pressing sleeve and a second sealing sleeve, and a set of limiting columns extending in the axial direction are evenly distributed on an opening in the bottom of the pressing sleeve along the edge of the pressing sleeve. The outer side of the bottom of the first sealing sleeve is provided with a set of first connecting lugs matched with the limiting columns one by one in the radial direction, the first connecting lugs are provided with inserting holes for being connected with the limiting columns in an inserted mode, and the top edges of the first sealing sleeve, the pressing sleeve and the second sealing sleeve extend in the radial direction, are stacked one by one from top to bottom and are pressed between the end face of the cover body and the end face of the shell. The cover body, the first sealing sleeve, the pressing sleeve, the second sealing sleeve and the shell are coaxially arranged, and the axes of the five are communicated to form a sealing channel through which a needle tube of the puncture needle assembly can penetrate. According to the scheme, the first connecting lug part is inserted into the limiting column to ensure the limiting stability of the pressing sleeve to the first sealing sleeve, so that the first sealing sleeve is prevented from flanging.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a cannula sealing assembly and a puncture device. Background Art

[0002] The existing puncture device generally consists of three parts: a puncture needle assembly, a sealer assembly and a puncture cannula assembly. Generally, the puncture needle assembly, the sealer assembly and the puncture cannula assembly are first combined together, and the puncture needle assembly is used to puncture the puncture cannula assembly from the human skin into the abdominal cavity, and artificial pneumoperitoneum is established through the sealer assembly on the puncture cannula assembly; after the puncture needle assembly is removed, the sealer assembly and the puncture cannula assembly form a surgical channel, and the surgical instrument or laparoscope is inserted into the abdominal cavity through the sealer assembly and the puncture cannula assembly to perform laparoscopic surgery.

[0003] Among them, the sealer components are mostly disclosed in announcement numbers CN 217660062 U and CN 104255469 B. The valve body structure needs to be set inside the shell to play the role of sealing and blocking gas. In order to ensure the sealing, the valve body is generally made of elastic material, but at the same time, this also makes it easy for the insert to drive the valve body to move during the insertion and removal process, resulting in the problem of flanging. In the existing structure, a fixed ring is used to limit the position of the valve body, and an unlocking button is set on the side of the fixed ring to play the function of unlocking and releasing. In order to facilitate manufacturing, the fixed ring and the unlocking button are usually integrated. This makes the fixed ring squeezed when the unlocking button is pressed to unlock, which will affect the loosening of the fixed ring and further affect its limit stability. At the same time, repeated squeezing makes the fixed ring at risk of being squeezed and broken, and once the fixed ring is broken, its fragments will enter the body or tear the valve body, causing great safety risks. Therefore, how to set the valve body safely and stably is a very important issue. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a cannula sealing assembly.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] The cannula sealing assembly comprises a shell and a cover body which are detachably connected, a cavity is formed between the two, a sealing member is arranged in the cavity, the sealing member comprises a first sealing sleeve, a pressing sleeve and a second sealing sleeve which are sequentially sleeved from the inside to the outside, a bottom opening of the pressing sleeve is uniformly provided with a group of axially extending limiting columns along its edge, a group of first connecting ears which are radially arranged on the outer side of the bottom of the first sealing sleeve and which are matched one by one with the limiting columns, a socket is arranged on the first connecting ear portion to be plugged with the limiting columns, the top edges of the first sealing sleeve, the pressing sleeve and the second sealing sleeve extend radially and are stacked one by one from top to bottom, and are pressed between the end faces of the cover body and the shell body, the cover body, the first sealing sleeve, the pressing sleeve, the second sealing sleeve and the shell body are all coaxially arranged, and the five axes are connected to form a sealing channel for the needle tube of the puncture needle assembly to pass through.

[0007] Preferably, the top of the shell has an annular groove, a group of connecting rods are arranged in the annular groove, and a group of plug-in tubes that can be plugged into the connecting rods one by one are arranged in the cover body. The connecting rods are plugged into the plug-in tubes to make the shell and the cover body detachably connected.

[0008] Preferably, a group of positioning rods are evenly distributed in the annular groove, and a group of second connecting ears matching the positioning rods are arranged outside the top edge of the pressing sleeve. The second connecting ears have through holes for clamping with the positioning rods to limit the position of the pressing sleeve.

[0009] Preferably, the cover body has a limiting convex ring extending axially relative to the shell. When the cover body is arranged on the shell, the limiting convex ring and the top end surface of the shell jointly define the top edges of the first sealing sleeve, the pressing sleeve and the second sealing sleeve.

[0010] Preferably, the top of the limiting convex ring has a first convex portion, the top edge of the pressing sleeve and the upper surface of the top end face have a second convex portion and a third convex portion opposite to the first convex portion, the bottom surfaces of the top edges of the first sealing sleeve and the second sealing sleeve have recesses respectively engaged with the second convex portion and the third convex portion, the first convex portion and the second convex portion jointly define the first sealing sleeve, and the lower surface of the top edge of the pressing sleeve and the third convex portion jointly define the second sealing sleeve.

[0011] Preferably, the top surface of the cover body extends radially and obliquely toward its axis, and its axis has a hollow guide tube extending axially downward to limit the insertion direction of the needle tube.

[0012] The puncture device includes a puncture needle assembly and a cannula assembly, and also includes the cannula sealing assembly as described above and a pair of snap buttons, wherein the snap buttons include a fixed end and a locking end which are elastically connected, wherein the fixed end is axially clamped between the shell and the cover body of the cannula sealing assembly, and when the shell is embedded in the outer shell of the cannula assembly, the bottom of the locking end is clamped with the outer wall of the outer shell to lock the cannula sealing assembly and the cannula assembly; there is a gap between the upper part of the locking end and the outer wall of the cover body, so that the upper part of the locking end moves relative to the cover body to drive its bottom to separate from the outer wall of the outer shell, and when the needle tube of the puncture needle assembly passes through the cannula sealing assembly and is inserted into the cannula of the cannula assembly, the outer wall of the top cover of the puncture needle assembly is clamped in the gap to limit the position of the locking end, so that the cannula sealing assembly and the cannula assembly remain in a locked state.

[0013] Preferably, upper limit grooves and lower limit grooves extending axially relative to each other are symmetrically arranged on both sides of the cover body and the shell. When the cover body is docked with the shell, the upper and lower parts of the fixed end are respectively clamped in the upper limit groove and the lower limit groove.

[0014] Preferably, the lower portion of the locking end extends inwardly and obliquely, and a first step surface is provided on the inner wall of the bottom thereof, and a second step surface matching the first step surface is provided on the outer wall of the outer shell, and the first step surface is snap-fitted with the second step surface to lock the cannula sealing assembly and the cannula assembly.

[0015] Preferably, the locking end is connected to the fixed end through a connecting piece, and the three are formed as one piece. When the cover body is covered on the shell, an opening is formed between the upper limit groove and the lower limit groove to allow the connecting piece to pass through. The connecting piece is bent in a V shape and has deformable elasticity.

[0016] The beneficial effects of the utility model are mainly reflected in:

[0017] 1. A hard pressing sleeve is provided to cooperate with the shell and the cover body to respectively press the top edges of the first sealing sleeve and the second sealing sleeve, and a limiting column is provided at the bottom of the pressing sleeve. A radially extending first connecting ear is provided at the bottom of the first sealing sleeve to be plugged into the limiting column. The first connecting ear is perpendicular to the axis of the first sealing sleeve to ensure the stability of the pressing sleeve limiting the first sealing sleeve, so as to prevent the position of the first sealing sleeve from being affected during the insertion and removal of the puncture needle and prevent the first sealing sleeve from being flanging;

[0018] 2. The buckle button is set as an independent component, and an upper limit groove and a lower limit groove are set on the side of the cover body and the shell to limit the fixed end of the buckle button and fix the buckle button, thereby replacing the fixed ring structure in the conventional design, so that the buckle button is separated from the top edge of the seal, avoiding the buckle button in the conventional structure from squeezing the fixed ring structure, and eliminating the influence on the installation stability of the seal;

[0019] 3. The gap between the upper part of the locking end and the cover body allows space for rotation to unlock the cannula sealing assembly and the cannula assembly. At the same time, when the puncture needle assembly is inserted, the top cover is inserted into the gap to lock the locking end to prevent accidental unlocking, thereby ensuring safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 : A cross-sectional view of the cannula seal assembly;

[0022] Figure 2 : Exploded view of the cannula seal assembly;

[0023] Figure 3 : A schematic diagram of a pressure sleeve and a first sealing sleeve in a cannula sealing assembly;

[0024] Figure 4 : A cross-sectional view of the pressure sleeve and the first sealing sleeve in the cannula sealing assembly;

[0025] Figure 5 : A cross-sectional view of the trocar;

[0026] Figure 6 : Schematic diagram of the shell;

[0027] Figure 7 : Schematic diagram of the pressing sleeve and the snap button. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0029] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0030] like Figures 1 to 7 As shown, the utility model discloses a cannula sealing assembly, comprising a detachably connected shell 1 and a cover 2, a cavity being formed between the two, and a Luer connector switch being arranged on the shell 1. The cavity is equipped with a seal, which includes a first sealing sleeve 3, a pressing sleeve 4 and a second sealing sleeve 5 which are sequentially sleeved from the inside to the outside. The bottom opening of the pressing sleeve 4 is evenly distributed with a group of axially extending limiting columns 401 along its edge. A group of first connecting ears 301 which match the limiting columns 401 one by one are radially arranged on the outer side of the bottom of the first sealing sleeve 3. The first connecting ears 301 are provided with sockets 302 for plugging with the limiting columns 401. The top edges of the first sealing sleeve 3, the pressing sleeve 4 and the second sealing sleeve 5 extend radially and are stacked one by one from top to bottom, and are pressed between the end faces of the cover body 2 and the shell 1. The cover body 2, the first sealing sleeve 3, the pressing sleeve 4, the second sealing sleeve 5 and the shell 1 are all coaxially arranged, and the five axes are connected to form a sealed channel 100 for the needle tube 701 of the puncture needle assembly 7 to pass through.

[0031] A limiting column 401 is arranged at the bottom of the pressing sleeve 4, and a radially extending first connecting ear 301 is arranged at the bottom of the first sealing sleeve 3 to be plugged into the limiting column 401, so that the first connecting ear 301 is perpendicular to the axis of the first sealing sleeve 3 to ensure the stability of the pressing sleeve 4 limiting the first sealing sleeve 3, so as to prevent the position of the first sealing sleeve 3 from being affected during the insertion and removal of the puncture needle and causing flanging.

[0032] like Figure 6 As shown, the top of the housing 1 has an annular groove 102, a group of connecting rods 103 are arranged in the annular groove 102, and a group of plug-in tubes (not shown in the figure) that can be plugged into the connecting rods 103 one by one are arranged in the cover 2, and the connecting rods 103 are plugged into the plug-in tubes to make the housing 1 and the cover 2 detachably connected. Preferably, a group of connecting rods 103 are evenly distributed along the annular groove 102 to make the connection between the housing 1 and the cover 2 more compact and stable.

[0033] Furthermore, a group of positioning rods 104 are evenly distributed in the annular groove 102, and a group of second connecting ears 402 matching the positioning rods 104 are arranged outside the top edge of the pressing sleeve 4, and the second connecting ears 402 have through holes for engaging with the positioning rods 104 to define the position of the pressing sleeve 4. Preferably, four positioning rods 104 are arranged to make the top of the pressing sleeve 4 bear force evenly, and the positioning rods 104 are arranged to fix the position of the top edge of the pressing sleeve 4 to prevent it from moving left and right.

[0034] like Figure 1 , Figure 2 and Figure 5 As shown, in order to stably limit the top edge of the seal, the cover body 2 has a limiting convex ring 201 extending axially relative to the shell 1. When the cover body 2 is covered on the shell 1, the limiting convex ring 201 and the top end face 105 of the shell 1 jointly limit the top edges of the first sealing sleeve 3, the pressing sleeve 4 and the second sealing sleeve 5.

[0035] Furthermore, the top of the limiting convex ring 201 has a first convex portion 202, the top edge of the pressing sleeve 4 and the upper surface of the top end surface 103 both have a second convex portion 403 and a third convex portion 106 that are directly opposite to the first convex portion 202, the bottom surfaces of the top edges of the first sealing sleeve 3 and the second sealing sleeve 5 have recesses that are respectively engaged with the second convex portion 403 and the third convex portion 106, the first convex portion 202 and the second convex portion 403 jointly define the first sealing sleeve 3, and the lower surface of the top edge of the pressing sleeve 4 and the third convex portion 106 jointly define the second sealing sleeve 5. Such a structure can make the top edges of the first sealing sleeve 3, the pressing sleeve 4 and the second sealing sleeve 5 stacked more closely in sequence to prevent slippage and misalignment.

[0036] The first sealing sleeve 3 has a uniform inner diameter at the top, and its lower inner diameter gradually decreases from top to bottom to form a cone. The interior is hollow, and its bottom has an opening for the needle tube 701 to pass through. The second sealing sleeve 5 has a uniform inner diameter at the top, and its lower part has symmetrically arranged cut surfaces, and the bottoms of the two cut surfaces fit together to form an opening that can be opened and closed. The first sealing sleeve 3 and the second sealing sleeve 5 are both made of high-density soft materials, such as silicone, so that the openings of the first sealing sleeve 3 and the second sealing sleeve 5 are elastic, so as to fit tightly with the needle tube 701 to form a seal.

[0037] The pressing sleeve 4, the limiting protruding ring 201 and the top end face 105 are all made of hard materials. The first protrusion 202, the second protrusion 403 and the third protrusion 106 can be arranged to press the top edges of the first sealing sleeve 3 and the second sealing sleeve 5, forming a reliable limit when the needle tube 701 is inserted and pulled out, thereby preventing flanging.

[0038] like Figure 1 As shown, the top surface of the cover body 2 extends radially and obliquely toward its axis to facilitate the insertion of the needle tube 701; and its axis has a hollow guide tube 203 extending axially downward to limit the insertion direction of the needle tube 701 to prevent the tip of the needle tube 701 from piercing the first sealing sleeve 3.

[0039] like Figure 5 As shown, the present scheme also discloses a puncture device, including a puncture needle assembly 7 and a cannula assembly 8, and also including the cannula sealing assembly as described above and a pair of snap buttons 6, wherein the snap buttons 6 include an elastically connected fixed end 601 and a locking end 602, wherein the fixed end 601 is axially clamped between the shell 1 and the cover 2 of the cannula sealing assembly, and when the shell 2 is embedded in the outer shell 801 of the cannula assembly 8, the bottom of the locking end 602 is clamped with the outer side wall of the outer shell 801 to lock the cannula sealing assembly and the cannula assembly 8; There is a gap 200 between the upper part of the locking end 602 and the outer wall of the cover body 2, so that the upper part of the locking end 602 can move relative to the cover body 2 to drive its bottom to separate from the outer wall of the outer shell 801. When the needle tube 701 of the puncture needle assembly 7 passes through the cannula sealing assembly and is inserted into the cannula 802 of the cannula assembly 8, the outer wall of the top cover 702 of the puncture needle assembly 7 is stuck in the gap 200 to limit the position of the locking end 602, so that the cannula sealing assembly and the cannula assembly 8 remain in a locked state.

[0040] The gap 200 between the upper part of the locking end 602 and the cover body 2 allows space for rotation to unlock the cannula seal assembly and the cannula assembly 8, and when the puncture needle assembly 7 is inserted, its top cover 702 is inserted into the gap 200 to lock the locking end 602, preventing the cannula seal assembly and the cannula assembly 8 from being mislocked by accidental touch, thereby ensuring safety in use. The puncture needle assembly 7 and the cannula assembly 8 are prior art, and their specific structures are not described in detail here.

[0041] Specifically, the upper limit groove 204 and the lower limit groove 101 extending in the axial direction are symmetrically arranged on both sides of the cover body 2 and the shell 1, and when the cover body 2 is docked with the shell 1, the upper and lower parts of the fixed end 601 are respectively clamped in the upper limit groove 204 and the lower limit groove 101, so that the upper limit groove 204 and the lower limit groove 101 jointly form an axial limit for the fixed end 601. On the other hand, the fixed point 601 is a straight and extending square sheet, which is an interference fit with the upper limit groove 204 and the lower limit groove 101, and such a structure also makes the side connection of the cover body 2 and the shell 1 more tightly.

[0042] The snap button 6 in the present solution is an independent component, and the two snap buttons 6 are independently arranged without interfering with each other, and an upper limit groove 204 and a lower limit groove 101 are provided to limit the fixed end 601 of the snap button 6 to fix the snap button 6, thereby replacing the fixed ring structure in the conventional design, so that the snap button 6 is separated from the top edge of the seal and does not interfere with each other, thereby avoiding the squeezing of the fixed ring structure by the snap button in the conventional structure and eliminating the influence on the installation stability of the seal.

[0043] The lower part of the locking end 602 extends inwardly and tilts to match the outer side wall of the housing 801; and a first step surface 604 is provided on the inner wall of the bottom thereof, and a second step surface 803 matching the first step surface 604 is provided on the outer side wall of the housing 801, and the first step surface 604 and the second step surface 803 are engaged to lock the cannula sealing assembly and the cannula assembly 8. In order to enhance the friction force, the outer side wall of the locking end 602 is also provided with anti-slip grooves.

[0044] Furthermore, the locking end 602 is connected to the fixed end 601 through a connecting piece 603, and the three are integrally formed. When the cover body 2 is covered on the housing 1, an opening is formed between the upper limit groove 204 and the lower limit groove 101, through which the connecting piece 603 can pass. The connecting piece 603 is bent in a V shape and has deformable elasticity. The elasticity of the connecting piece 603 allows the locking end 602 to be reset under the elastic drive of the connecting piece 603 after the upper part is pressed.

[0045] In other feasible embodiments, other structures that can enable the locking end 602 to swing relative to the fixed end 601 may be used between the locking end 602 and the fixed end 601, such as a torsion spring.

[0046] Furthermore, in order to ensure a stable and effective sealing connection between the cannula sealing assembly and the cannula component 8, a groove 107 is provided on the outer wall of the shell 1 to embed the sealing ring 9, so that when the shell 1 is set in the outer shell 801, the sealing ring 9 seals the connection between the two.

[0047] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0048] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A cannula sealing assembly, characterized in that: The invention comprises a shell (1) and a cover (2) which are detachably connected, a cavity being formed between the two, a sealing member being built in the cavity, the sealing member comprising a first sealing sleeve (3), a pressing sleeve (4) and a second sealing sleeve (5) which are sequentially sleeved from the inside to the outside, a group of axially extending limiting columns (401) being evenly distributed along the edge of the bottom opening of the pressing sleeve (4), a group of first connecting ears (301) which are matched one by one with the limiting columns (401) being radially arranged on the outer side of the bottom of the first sealing sleeve (3), the first connecting ears (301) being ) is provided with a plug hole (302) for plugging with the limiting column (401), the top edges of the first sealing sleeve (3), the pressing sleeve (4) and the second sealing sleeve (5) extend radially and are stacked one by one from top to bottom, and are pressed between the end faces of the cover body (2) and the shell body (1), the cover body (2), the first sealing sleeve (3), the pressing sleeve (4), the second sealing sleeve (5) and the shell body (1) are all coaxially arranged, and the five axes are connected to form a sealed channel (100) that allows the needle tube (701) of the puncture needle assembly (7) to pass through.

2. The cannula sealing assembly according to claim 1, characterized in that: The top of the shell (1) has an annular groove (102), a group of connecting rods (103) are arranged in the annular groove (102), and a group of plug-in tubes that can be plugged into the connecting rods (103) one by one are arranged in the cover (2), and the connecting rods (103) are plugged into the plug-in tubes so that the shell (1) and the cover (2) are detachably connected.

3. The cannula sealing assembly according to claim 2, characterized in that: A group of positioning rods (104) are evenly distributed in the annular groove (102), and a group of second connecting ears (402) matching the positioning rods (104) are arranged outside the top edge of the pressing sleeve (4), and the second connecting ears (402) have through holes for clamping with the positioning rods (104) to limit the position of the pressing sleeve (4).

4. The cannula sealing assembly according to claim 3, characterized in that: The cover body (2) has a limiting convex ring (201) extending axially relative to the shell body (1); when the cover body (2) is placed on the shell body (1), the limiting convex ring (201) and the top end surface (105) of the shell body (1) jointly define the top edges of the first sealing sleeve (3), the pressing sleeve (4) and the second sealing sleeve (5).

5. The cannula sealing assembly according to claim 4, characterized in that: The top of the limiting convex ring (201) has a first convex portion (202), the top edge of the pressing sleeve (4) and the upper surface of the top end surface (105) have a second convex portion (403) and a third convex portion (106) directly opposite to the first convex portion (202), the bottom surfaces of the top edges of the first sealing sleeve (3) and the second sealing sleeve (5) have recessed portions respectively engaged with the second convex portion (403) and the third convex portion (106), the first convex portion (202) and the second convex portion (403) jointly define the first sealing sleeve (3), and the lower surface of the top edge of the pressing sleeve (4) and the third convex portion (106) jointly define the second sealing sleeve (5).

6. The cannula sealing assembly according to any one of claims 1 to 5, characterized in that: The top surface of the cover body (2) extends radially and obliquely toward its axis, and its axis has a hollow guide tube (203) extending axially downward to limit the insertion direction of the needle tube (701).

7. A puncture device, comprising a puncture needle assembly (7) and a cannula assembly (8), characterized in that: It also includes a cannula sealing assembly as described in any one of claims 1 to 5 and a pair of snap buttons (6), the snap buttons (6) including a resiliently connected fixed end (601) and a locking end (602), the fixed end (601) being axially clamped between the shell (1) and the cover (2) of the cannula sealing assembly, and when the shell (1) is embedded in the outer shell (801) of the cannula assembly (8), the bottom of the locking end (602) is clamped with the outer wall of the outer shell (801) to lock the cannula sealing assembly and the cannula assembly (8); the upper part of the locking end (602) is clamped with ... There is a gap (200) between the outer walls of the cover body (2) so that the upper part of the locking end (602) moves relative to the cover body (2) to drive its bottom to separate from the outer wall of the shell (801). When the needle tube (701) of the puncture needle assembly (7) passes through the cannula sealing assembly and is inserted into the cannula (802) of the cannula assembly (8), the outer wall of the top cover (702) of the puncture needle assembly (7) is stuck in the gap (200) to limit the position of the locking end (602), so that the cannula sealing assembly and the cannula assembly (8) remain in a locked state.

8. The trocar according to claim 7, characterized in that: An upper limit groove (204) and a lower limit groove (101) extending in a relative axial direction are symmetrically arranged on both sides of the cover body (2) and the shell body (1); when the cover body (2) and the shell body (1) are docked, the upper part and the lower part of the fixed end (601) are respectively clamped in the upper limit groove (204) and the lower limit groove (101).

9. The trocar according to claim 8, characterized in that: The lower portion of the locking end (602) extends inwardly and is inclined, and a first step surface (604) is provided on the inner wall of the bottom thereof, and a second step surface (803) matching the first step surface (604) is provided on the outer wall of the outer shell (801), and the first step surface (604) and the second step surface (803) are snap-fitted to lock the cannula sealing assembly and the cannula component (8).

10. The trocar according to claim 9, characterized in that: The locking end (602) is connected to the fixed end (601) via a connecting piece (603), and the three are integrally formed. When the cover body (2) is placed on the shell (1), an opening is formed between the upper limit groove (204) and the lower limit groove (101) to allow the connecting piece (603) to pass through. The connecting piece (603) is bent in a V-shape and has deformable elasticity.

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