Sleeve assembly of puncture outfit

Abstract

The invention provides a puncture outfit cannula assembly, and relates to the technical field of puncture outfits. The puncture outfit cannula assembly comprises a cannula, a sealing film and a holding part, the sealing film is arranged in the cannula, the holding part is partially arranged in the cannula, the holding part is connected with the top of the cannula and abuts against the sealing film, the holding part is used for holding an external instrument so that the instrument can be located in the center of the cannula, and the puncture outfit cannula assembly can relieve damage to the sealing film.

Description

Technical Field

[0001] The present application relates to the technical field of trocars, and in particular to a trocar sleeve assembly. Background Art

[0002] With the continuous promotion of laparoscopic minimally invasive surgery, doctors are becoming increasingly familiar with and proficient in the use of trocars, which are essential in minimally invasive surgery. Doctors create pneumoperitoneum and use trocars to establish surgical channels during laparoscopic minimally invasive surgery, allowing various instruments (such as ultrasonic scalpels, staplers, etc.) to enter the abdominal cavity for surgical operations.

[0003] During use of the existing trocar, external instruments may be inserted into the trocar, which may easily damage the sealing film, thereby causing the sealing film to be unable to wrap the instrument in real time, resulting in air leakage. Summary of the invention

[0004] Objectives of the present application include, for example, providing a puncture cannula assembly that can reduce damage to a sealing membrane.

[0005] The embodiments of the present application can be implemented as follows: An embodiment of the present application provides a puncture cannula assembly, which includes a cannula, a sealing film and a holding piece, wherein the sealing film is disposed in the cannula, the holding piece is partially disposed in the cannula, the holding piece is connected to the top of the cannula and abuts against the sealing film, and the holding piece is used to hold an external instrument so that the instrument is located in the center of the cannula.

[0006] Optionally, the holding member includes a fixed cover, a sleeve, and a plurality of elastic structures arranged along the circumference of the sleeve, the fixed cover is connected to the sleeve, the fixed cover is connected to the top of the sleeve, and the plurality of elastic structures are used to cooperate to hold external instruments.

[0007] Optionally, the elastic structure includes an integrally formed first connecting segment and a second connecting segment, wherein one end of the first connecting segment away from the second connecting segment is connected to the sleeve, and one end of the second connecting segment away from the first connecting segment is a free end, the first connecting segment extends toward the interior of the sleeve, and the second connecting segment extends toward the outside of the sleeve.

[0008] Optionally, a curved surface is provided at the connection between the first connecting segment and the second connecting segment, and the curved surfaces of the plurality of elastic structures are located on the same circumference.

[0009] Optionally, a first limiting ring is provided on the sealing membrane, and the bottom end of the sleeve cooperates with the first limiting ring so that the central axis of the sleeve coincides with the central axis of the sealing membrane.

[0010] Optionally, the surface of the sealing film is arc-shaped, and the thickness of the sealing film gradually decreases in a direction away from the holding member.

[0011] Optionally, the fixed cover is provided with a first opening for the instrument to enter, and the fixed cover is provided with a second limiting ring and a third limiting ring, and the top end of the sleeve extends between the second limiting ring and the third limiting ring, wherein the diameter of the third limiting ring is greater than the diameter of the second limiting ring.

[0012] Optionally, a limiting snap-in is provided on the third limiting ring, and a limiting portion is provided on the sleeve, and the limiting portion is inserted into the limiting snap-in.

[0013] Optionally, the fixing cover and the sleeve are integrally formed.

[0014] Optionally, the trocar sleeve assembly further comprises an air blocking valve, wherein the air blocking valve is arranged inside the sleeve, and the sealing membrane partially extends into the air blocking valve.

[0015] Optionally, the air blocking valve includes an integrally formed mounting portion and an air blocking portion, an annular protrusion is provided inside the sleeve, an annular groove is provided on the mounting portion, the annular protrusion cooperates with the annular groove, and a second opening is provided on the air blocking portion.

[0016] Optionally, the outer surface of the air blocking portion is arc-shaped.

[0017] The beneficial effects of the puncture cannula assembly provided by the embodiment of the present application include, for example: in order to reduce the damage to the sealing film, a puncture cannula assembly is designed, the puncture cannula assembly includes a cannula, a sealing film and a holding piece, the sealing film is arranged in the cannula, the holding piece is partially arranged in the cannula, the holding piece is connected to the top of the cannula and abuts against the sealing film, and the holding piece is used to hold the external instrument so that the instrument is in the center of the cannula. By arranging the holding piece at the front end of the sealing film, when the external instrument enters the cannula, the holding piece can hold the instrument so that the instrument is in the center of the cannula, and at this time the instrument is not easy to cause damage to the sealing film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a trocar sleeve assembly in an embodiment of the present application; Figure 2A partial cross-sectional view of the trocar sleeve assembly in the embodiment of the present application; Figure 3 A schematic diagram of a first holding member from a first viewing angle in an embodiment of the present application; Figure 4 A schematic diagram of a second viewing angle of the first holding member in an embodiment of the present application; Figure 5 This is a schematic diagram of a sealing film in an embodiment of the present application; Figure 6 This is a schematic diagram of a fixed cover in an embodiment of the present application; Figure 7 It is a schematic diagram of the local structure of the sleeve in the embodiment of the present application; Figure 8 A schematic diagram of a second holding member in an embodiment of the present application; Fig. 9 Schematic diagram of the air blocking valve in the embodiment of the present application.

[0020] Icons: 100-sleeve; 110-fixing column; 120-annular protrusion; 130-extension tube; 131-Rule channel; 132-mounting hole; 200-sealing film; 210-first limiting ring; 220-second reinforcing rib; 300-holding member; 310-sleeve; 311-rectangular through hole; 312-third reinforcing rib; 320-elastic structure; 321-first connecting section; 322-second connecting section; 3 23-arc surface; 324-first reinforcing rib; 330-limiting part; 400-fixing cover; 410-first opening; 420-second limiting ring; 430-third limiting ring; 431-limiting bayonet; 440-fixing hole; 450-guide arc surface; 460-buckle; 500-air blocking valve; 510-installation part; 511-annular groove; 520-air blocking part; 521-second opening; 600-air injection valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does 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 on the present application.

[0025] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0027] As disclosed in the background technology section, during the use of the existing trocar, an external device is inserted into the trocar, and once the device is in an inclined state or not located at the center of the cannula, the device is likely to damage the sealing film, which in turn causes the sealing film to be unable to wrap the device in real time, resulting in air leakage. The embodiment of the present application provides a trocar cannula assembly, which is at least used to solve the above technical problems.

[0028] Please refer to Figure 1 , Figure 2 The puncture cannula assembly provided in the embodiment of the present application includes a cannula 100, a sealing film 200 and a holding piece 300. The sealing film 200 is arranged in the cannula 100, and the holding piece 300 is partially arranged in the cannula 100. The holding piece 300 is connected to the top of the cannula 100 and abuts against the sealing film 200. The holding piece 300 is used to hold an external instrument so that the instrument is in the center of the cannula 100.

[0029] An installation cavity is provided in the sleeve 100, and parts of the sealing film 200 and the holding member 300 are both provided in the installation cavity. When the holding member 300 is connected to the top of the sleeve 100, the holding member 300 presses and fixes the sealing film 200 in the installation cavity.

[0030] By arranging the holding piece 300 at the front end of the sealing film 200 , when an external instrument enters the sleeve 100 , the holding piece 300 can hold the instrument so that the instrument is located at the center of the sleeve 100 , and the sealing film 200 is not easily damaged by the instrument.

[0031] Please refer to Figure 3 , Figure 4In this embodiment, the holding member 300 includes a fixed cover 400, a sleeve 310 and a plurality of elastic structures 320 arranged along the circumference of the sleeve 310. The fixed cover 400 is connected to the sleeve 310, and the fixed cover 400 is connected to the top of the sleeve 100. The plurality of elastic structures 320 are used to cooperate with each other to hold external instruments.

[0032] The elastic structure 320 has a certain elasticity. When an external instrument enters the sleeve 310 , the multiple elastic structures 320 cooperate to hold the instrument so that the instrument is located at the center of the sleeve 100 .

[0033] In this embodiment, the elastic structure 320 includes an integrally formed first connecting section 321 and a second connecting section 322. The end of the first connecting section 321 away from the second connecting section 322 is connected to the sleeve 310, and the end of the second connecting section 322 away from the first connecting section 321 is a free end. The first connecting section 321 extends toward the interior of the sleeve 310, and the second connecting section 322 extends toward the outside of the sleeve 310.

[0034] The sleeve 310 is provided with a plurality of rectangular through holes 311 along the circumferential direction, and the plurality of rectangular through holes 311 correspond one to one with the plurality of elastic structures 320. One end of the first connecting section 321 away from the second connecting section 322 is connected to the inner top wall of the rectangular through hole 311; the first connecting section 321 extends toward the interior of the sleeve 310, and the surface of the first connecting section 321 is a downwardly inclined conical surface; the second connecting section 322 extends toward the exterior of the sleeve 310, and the surface of the second connecting section 322 is an arc surface; the first connecting section 321 and the second connecting section 322 jointly form an elastic structure 320 protruding toward the interior of the sleeve 310 so as to hold the instrument.

[0035] Furthermore, a curved surface 323 is provided at the connection between the first connecting section 321 and the second connecting section 322 , and the curved surfaces 323 of the plurality of elastic structures 320 are located on the same circumference.

[0036] On a cross section parallel to the top surface of the sleeve 310 , the arcuate surfaces 323 on the multiple elastic structures 320 are located on the same circumference. The multiple arcuate surfaces 323 cooperate together to hold the instrument so that the instrument is located at the center of the sleeve 310 .

[0037] It should be noted that the diameter of the circle should match the diameter of the largest device allowed to pass through, and the circle can be adjusted to different sizes for different types of trocars. For example, to allow a device with a maximum diameter of 10 mm to enter, the diameter of the circle surrounded by the arcuate surfaces 323 of the multiple elastic structures 320 is 9-10 mm, so that when holding the device, excessive force will not be applied to affect the operation.

[0038] In addition, a first reinforcing rib 324 is disposed between the first connecting section 321 and the second connecting section 322 .

[0039] By providing the first reinforcing rib 324 between the first connecting section 321 and the second connecting section 322 , the holding force of the elastic structure 320 on the instrument can be increased, so that the instrument can be better maintained at the center of the sleeve 100 .

[0040] Please refer to Figure 5 In this embodiment, a first limiting ring 210 is provided on the sealing film 200 , and the bottom end of the sleeve 310 cooperates with the first limiting ring 210 so that the central axis of the sleeve 310 coincides with the central axis of the sealing film 200 .

[0041] The first limiting ring 210 is protruding upward from the top of the sealing film 200, and the bottom end of the sleeve 310 extends into the inner side of the first limiting ring 210 and fits with the first limiting ring 210, so that the central axis of the sleeve 310 and the sealing film 200 coincide, avoiding damage to the sealing film 200 due to misalignment of the sleeve 310 and the sealing film 200.

[0042] In this embodiment, the surface of the sealing film 200 is arc-shaped, and the thickness of the sealing film 200 gradually decreases in a direction away from the holding member 300 .

[0043] The sealing film 200 is provided with a central hole for the instrument to pass through. The inner and outer surfaces of the main body of the sealing film 200 are both arc-shaped. The thickness of the portion of the sealing film 200 closer to the central hole is thinner. When the instrument enters the sealing film 200, it is only subjected to the pulling force of the portion of the sealing film 200 closer to the central hole, so that the instrument can move relatively smoothly. When the instrument is withdrawn, since the thickness of the portion of the sealing film 200 closer to the central hole is thinner, even if the portion of the sealing film 200 closer to the central hole is folded, since the thickness of the portion of the sealing film 200 farther from the central hole is thicker, the portion of the sealing film 200 closer to the central hole will be pulled back to its original shape by the portion of the sealing film 200 farther from the central hole.

[0044] The holding function of the holding member 300 on the instrument avoids the biased pulling on the central hole of the sealing film 200 during the use of the instrument to the greatest extent, and prevents the sealing film 200 from being broken due to prolonged pulling during surgery.

[0045] In addition, a second reinforcing rib 220 is disposed on the outer surface of the sealing membrane 200 .

[0046] A plurality of second reinforcing ribs 220 are provided along the outer surface of the main body of the sealing film 200 , which can enhance the strength of the sealing film 200 and enable the portion of the sealing film 200 close to the central hole to quickly return to its original position after being folded.

[0047] Please refer to Figure 6In some embodiments, the fixed cover 400 and the sleeve 310 are split structures, and a first opening 410 for the instrument to enter is opened on the fixed cover 400, and the first opening 410 is connected to the sleeve 310; a second limiting ring 420 and a third limiting ring 430 are provided on the fixed cover 400, and the top end of the sleeve 310 extends between the second limiting ring 420 and the third limiting ring 430, wherein the diameter of the third limiting ring 430 is greater than the diameter of the second limiting ring 420.

[0048] The second limiting ring 420 and the third limiting ring 430 both extend toward the interior of the sleeve 100, and the second limiting ring 420 and the third limiting ring 430 are coaxially arranged, and the top end of the sleeve 310 extends between the second limiting ring 420 and the third limiting ring 430, and the second limiting ring 420 and the third limiting ring 430 cooperate together to limit the sleeve 310, so that the first opening 410 coincides with the central axis of the sleeve 310.

[0049] Furthermore, a limiting snap-in 431 is provided on the third limiting ring 430 , and a limiting portion 330 is provided on the sleeve 310 , and the limiting portion 330 is snapped into the limiting snap-in 431 .

[0050] By making the limiting portion 330 snap into the limiting snap-in hole 431 , the fixing cover 400 can prevent the sleeve 310 from rotating, so as to prevent the sleeve 310 from rotating when the instrument is inserted or removed.

[0051] Optionally, two limiting snap-on holes 431 are arranged on the third limiting ring 430, and correspondingly, two limiting parts 330 are arranged on the sleeve 310, and the two limiting parts 330 are respectively inserted into the two limiting snap-on holes 431. The limiting parts 330 are convexly arranged on the outer surface of the sleeve 310, and the limiting parts 330 can be limiting plates or limiting columns. Figure 7 In some embodiments, a plurality of fixing holes 440 are circumferentially provided on the fixing cover 400 , and a plurality of fixing columns 110 are provided on the top of the sleeve 100 , and the plurality of fixing columns 110 are matched with the plurality of fixing holes 440 in a one-to-one correspondence.

[0052] Multiple fixing holes 440 are all arranged on the surface of the fixing cover 400 facing the inner side of the sleeve 100, and multiple fixing columns 110 are inserted into the multiple fixing holes 440 one by one. The fixing columns 110 and the fixing holes 440 can be optionally interference fit to relatively fix the fixing cover 400 and the sleeve 100.

[0053] For some other embodiments, please refer to Figure 8 The fixing cover 400 and the sleeve 310 are integrally formed, the fixing cover 400 and the top of the sleeve 100 are connected by a buckle 460, and a third reinforcing rib 312 is provided on the outer surface of the sleeve 310 along the circumferential direction.

[0054] When the fixing cover 400 and the sleeve 310 are integrally formed, the holding position is moved upward as a whole, and the first reinforcing rib 324 provided between the first connecting section 321 and the second connecting section 322 can be eliminated. By providing the third reinforcing rib 312 on the sleeve 310, the overall strength of the holding member 300 can be ensured.

[0055] Combination Figure 1 In this embodiment, the fixing cover 400 is provided with a guiding arc surface 450 at the first opening 410 .

[0056] The guide arc surface 450 serves to guide the instrument into the sleeve 100 . When the instrument contacts the guide arc surface 450 , the guide arc surface 450 can guide the instrument into the first opening 410 .

[0057] The height of the second limiting ring 420 is greater than that of the third limiting ring 430. The second limiting ring 420 can contact the instrument. After the instrument enters the first opening 410 along the guide arc surface 450, the instrument will bump against the second limiting ring 420, so that the instrument will naturally deviate to coincide with the central axis of the sleeve 100 as it continues to be pushed forward. The instrument can be straightened as soon as it enters the sleeve 100, thereby limiting the angle of entry of the instrument to prevent the instrument from being stuck in the rectangular through hole 311 corresponding to the elastic structure 320.

[0058] Please refer to Fig. 9 In this embodiment, the trocar sleeve assembly further includes an air blocking valve 500 , which is disposed inside the sleeve 100 , and a portion of the sealing film 200 extends into the air blocking valve 500 .

[0059] The air blocking valve 500 can maintain the seal inside the sleeve 100 when no instrument passes through, and the sealing film 200 can maintain the seal inside the sleeve 100 when an instrument passes through. The air blocking valve 500 and the sealing film 200 form a double sealing structure.

[0060] Furthermore, the air blocking valve 500 includes an integrally formed mounting portion 510 and an air blocking portion 520 , an annular protrusion 120 is provided inside the sleeve 100 , an annular groove 511 is provided on the mounting portion 510 , the annular protrusion 120 cooperates with the annular groove 511 , and a second opening 521 is provided on the air blocking portion 520 .

[0061] An annular protrusion 120 facing the fixing cover 400 is provided in the installation cavity of the sleeve 100 . The annular protrusion 120 cooperates with the annular groove 511 , so that the air blocking valve 500 is located at the center of the sleeve 100 .

[0062] When the fixed cover 400 is fixed to the top of the sleeve 100, the fixed cover 400 presses the holding piece 300, the holding piece 300 presses the sealing film 200, the sealing film 200 presses the air blocking valve 500, and the annular groove 511 on the air blocking valve 500 is tightly matched with the annular protrusion 120 on the sleeve 100, so that a seal is formed between the fixed cover 400 and the holding piece 300, between the holding piece 300 and the sealing film 200, between the sealing film 200 and the air blocking valve 500, and between the air blocking valve 500 and the sleeve 100.

[0063] In this embodiment, the outer surface of the air blocking portion 520 is arc-shaped.

[0064] The second opening 521 on the air blocking portion 520 is in a cross shape. The second opening 521 is pushed open when the instrument enters, and the second opening 521 returns to its original state when the instrument exits. The outer surface of the air blocking portion 520 is designed to be arc-shaped, which is conducive to the second opening 521 automatically closing and returning to its original state when the instrument exits. After being stretched open for a long time, the second opening 521 may reach the tolerance limit of the material itself and cannot be fully restored. However, due to the arc-shaped design, the second opening 521 can be restored by more material volume without increasing the tolerance limit of the material, thereby extending the time that the second opening 521 can be stretched open by the instrument.

[0065] In this embodiment, the trocar sleeve assembly further includes an air injection valve 600 , which is disposed on the sleeve 100 .

[0066] An extension tube 130 is provided on one side of the sleeve 100, and a Luer channel 131 is provided in the extension tube 130. A mounting hole 132 perpendicular to the axis of the Luer channel 131 is provided on the extension tube 130. An injection valve 600 is installed in the mounting hole 132. The opening and closing of the Luer channel 131 can be controlled by rotating the injection valve 600, so as to deliver additional gas or release pneumoperitoneum according to the needs of the operation.

[0067] The installation process of the puncture sleeve assembly provided in the embodiment of the present application is as follows: the fixing cover 400 is turned upside down, and the holding piece 300, the sealing film 200, and the air-blocking valve 500 are assembled upside down in sequence. Finally, the sleeve 100 is invertedly mounted on the holding piece 300, the sealing film 200, and the air-blocking valve 500 for preliminary pre-pressing. At this time, the puncture sleeve assembly can be placed on the tooling for a complete tight fit and pressing, thereby completing the assembly of the puncture sleeve assembly.

[0068] The beneficial effects of the puncture sleeve assembly provided in the embodiment of the present application include at least: the holding member 300 has a certain holding effect on the instrument through multiple elastic structures 320, so that the instrument and the entire puncture sleeve assembly become a whole, and the instrument is maintained at the center position of the sleeve 100, thereby avoiding the biased pulling of the instrument on the central hole of the sealing film 200 to the greatest extent, and preventing the sealing film 200 from being broken due to long-term pulling during surgery; because the holding member 300 is provided between the sealing film 200 and the fixed cover 400, the distance between the sealing film 200 and the fixed cover 400 is increased, when the instrument enters and reaches the sealing film 200, even if the instrument is still skewed to a certain extent, the front end of the instrument can basically align with the central hole of the sealing film 200, thereby avoiding the instrument from puncturing the sealing film 200.

[0069] In summary, the embodiment of the present application provides a puncture cannula assembly, which includes a cannula 100, a sealing film 200, a holding member 300 and a fixed cover 400. The holding member 300 is arranged between the fixed cover 400 and the sealing film 200, thereby increasing the distance between the fixed cover 400 and the sealing film 200. When an external instrument enters the cannula 100, the holding member 300 can hold the instrument so that the instrument is in the center of the cannula 100. At this time, the instrument is not easy to cause damage to the sealing film 200.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A trocar sleeve assembly, characterized in that: The invention comprises a sleeve (100), a sealing film (200) and a holding piece (300), wherein the sealing film (200) is arranged in the sleeve (100), the holding piece (300) is partially arranged in the sleeve (100), the holding piece (300) is connected to the top of the sleeve (100) and abuts against the sealing film (200), and the holding piece (300) is used to hold an external instrument so that the instrument is located at the center of the sleeve (100).

2. The trocar sleeve assembly according to claim 1, characterized in that: The holding member (300) comprises a fixed cover (400), a sleeve (310), and a plurality of elastic structures (320) arranged along the circumference of the sleeve (310); the fixed cover (400) and the sleeve (310) are connected; the fixed cover (400) is connected to the top of the sleeve (100); and the plurality of elastic structures (320) are used to cooperate with each other to hold external instruments.

3. The trocar sleeve assembly according to claim 2, characterized in that: The elastic structure (320) comprises an integrally formed first connecting section (321) and a second connecting section (322); an end of the first connecting section (321) away from the second connecting section (322) is connected to the sleeve (310); an end of the second connecting section (322) away from the first connecting section (321) is a free end; the first connecting section (321) extends toward the interior of the sleeve (310), and the second connecting section (322) extends toward the exterior of the sleeve (310).

4. The trocar sleeve assembly according to claim 3, characterized in that: An arcuate surface (323) is provided at the connection between the first connecting section (321) and the second connecting section (322), and the arcuate surfaces (323) of the plurality of elastic structures (320) are located on the same circumference.

5. The trocar cannula assembly according to claim 2, characterized in that: A first limiting ring (210) is provided on the sealing membrane (200), and the bottom end of the sleeve (310) cooperates with the first limiting ring (210) so that the central axis of the sleeve (310) coincides with the central axis of the sealing membrane (200).

6. The trocar cannula assembly according to claim 1, characterized in that: The surface of the sealing film (200) is arc-shaped, and the thickness of the sealing film (200) gradually decreases in a direction away from the holding member (300).

7. The trocar cannula assembly according to claim 2, characterized in that: The fixing cover (400) is provided with a first opening (410) for the instrument to enter, and the fixing cover (400) is provided with a second limiting ring (420) and a third limiting ring (430), and the top end of the sleeve (310) extends between the second limiting ring (420) and the third limiting ring (430), wherein the diameter of the third limiting ring (430) is greater than the diameter of the second limiting ring (420).

8. The trocar cannula assembly according to claim 7, characterized in that: A limiting snap-in (431) is provided on the third limiting ring (430), a limiting portion (330) is provided on the sleeve (310), and the limiting portion (330) is snapped into the limiting snap-in (431).

9. The trocar cannula assembly according to claim 2, characterized in that: The fixing cover (400) and the sleeve (310) are integrally formed.

10. The trocar cannula assembly according to claim 1, characterized in that: The trocar sleeve assembly further comprises an air blocking valve (500), wherein the air blocking valve (500) is arranged inside the sleeve (100), and the sealing film (200) partially extends into the air blocking valve (500).

11. The trocar cannula assembly according to claim 10, characterized in that: The air blocking valve (500) comprises an integrally formed mounting portion (510) and an air blocking portion (520); an annular protrusion (120) is provided inside the sleeve (100); an annular groove (511) is provided on the mounting portion (510); the annular protrusion (120) cooperates with the annular groove (511); and a second opening (521) is provided on the air blocking portion (520).

12. The trocar cannula assembly according to claim 11, characterized in that: The outer surface of the air blocking portion (520) is arc-shaped.

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