Puncture outfit for laparoscope

Abstract

The puncture outfit for the laparoscope comprises a sleeve, a supporting cap, a sealing cap and a choke valve are sequentially arranged in the sleeve, and the extending depths of the supporting cap, the sealing cap and the choke valve in the sleeve are gradually increased one by one; the puncture cone is detachably inserted into the sleeve; the sealing cover is detachably arranged on the sleeve; the sealing cover surrounds the supporting cap, the sealing cap and the choke valve to seal the sleeve; the supporting cap, the sealing cap and the choke valve wrap the puncture cone; when the puncture cone is separated from the sleeve, the supporting cap, the sealing cap and the choke valve are all reset and self-closed. After a puncture cone or other surgical instruments are inserted into the cannula, the supporting cap, the sealing cap and the air blocking valve can play a wrapping role, the sealing cap can further seal the cannula to enhance the sealing performance of the cannula, and when the puncture cone or other surgical instruments are gradually separated from or inserted into the cannula, the air blocking valve firstly seals the containing cavity of the cannula, and then the cannula is sealed. And through successive sealing of the sealing cap and the supporting cap, the air leakage effect of the casing pipe can be obviously reduced, and the air tightness of the casing pipe is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a trocar for laparoscopy. Background Technology

[0002] Laparoscopic trocars are used in laparoscopic minimally invasive surgery. They operate through several small incisions in the patient's abdomen, allowing the insertion of various thin surgical instruments and a small tube equipped with a camera. This camera transmits images of internal organs to a monitor, enabling the surgeon to see the area they are working on. The primary function of the laparoscopic trocar is to create a safe passage in the abdominal wall for the insertion of a laparoscope and other surgical instruments.

[0003] Current laparoscopic trocars typically have a sharp cannula that can penetrate the abdominal wall by rotation or direct insertion, and an outer sheath that can be removed after penetration, leaving the cannula as a passage for surgical instruments. After establishing pneumoperitoneum using current laparoscopic trocars, the cannula needs to be withdrawn from the outer sheath because other surgical instruments need to be inserted inside. Furthermore, surgeons will use different manipulation techniques for the surgical instruments depending on the procedure, such as adjusting the angle and position of the instruments appropriately. Sometimes, repeated insertion and withdrawal movements are also required. Even if some outer sheaths are equipped with valves or valve systems, the effect of reducing air leakage from the outer sheath is still not significant, thus making it unfavorable for the use of pneumoperitoneum. Utility Model Content

[0004] The laparoscopic trocar of this invention is a disposable item, which can effectively solve the problem of obvious air leakage in the existing laparoscopic trocars in the prior art.

[0005] According to one aspect of the present invention, a laparoscopic trocar is provided, comprising:

[0006] The casing is provided with a support cap, a sealing cap and an air-blocking valve in sequence inside the casing, and the extension depth of the support cap, the sealing cap and the air-blocking valve inside the casing increases sequentially.

[0007] The puncture cone is detachably inserted into the cannula;

[0008] A sealing cap is detachably mounted on the sleeve; the sealing cap surrounds the support cap, sealing cap, and airlock valve to seal the sleeve.

[0009] When the puncture cone is inserted into the cannula, the support cap, sealing cap, and air-blocking valve enclose the puncture cone; when the puncture cone is removed from the cannula, the support cap, sealing cap, and air-blocking valve all reset and close automatically.

[0010] In some embodiments, an annular locking ring is also included. The annular locking ring is detachably mounted on the sleeve, the air-blocking valve abuts against the annular locking ring, and the sealing cap snaps onto and surrounds the annular locking ring. Thus, the annular locking ring supports the air-blocking valve, and its placement at the opening on the sleeve facilitates airtightness during subsequent assembly of the sleeve.

[0011] In some embodiments, the sleeve is provided with a first engaging portion and the annular locking ring is provided with a second engaging portion. The annular locking ring and the sleeve are detachably connected by engaging the first engaging portion and the second engaging portion.

[0012] The annular locking ring also has an abutting edge. When the first engaging part and the second engaging part are engaged, the abutting edge abuts against the sleeve. Thus, the first engaging part and the abutting edge can limit the annular locking ring, thereby improving the connection strength of the annular locking ring.

[0013] In some embodiments, the annular locking ring has a third engaging portion, and the sealing cap has a fourth engaging portion. When the sealing cap surrounds the annular locking ring, the third engaging portion engages with the fourth engaging portion. Therefore, the cooperation between the third and fourth engaging portions helps to increase the airtightness of the sealing cap after assembly.

[0014] In some embodiments, an injection assembly is also included on the sleeve, which has an injection port and a insertion hole communicating with the interior. The injection assembly is detachably inserted into the insertion hole to block the injection port. Thus, the injection assembly enables the sleeve to be injected and vented, simplifying the operation process.

[0015] In some embodiments, the gas injection assembly has a gas injection valve and a valve seat, with the valve seat inserted into the socket and the gas injection valve snapped onto the valve seat to block the gas injection port. Thus, the connection state of the gas injection port is controlled by the cooperation of the gas injection valve and the valve seat, facilitating operation and simplifying the structure of the gas injection assembly.

[0016] In some embodiments, a fixing seat is also included, disposed between the sealing cap and the air-blocking valve to fix and support the sealing cap, with the sealing cap abutting against the inner wall of the air-blocking valve. Thus, the fixing seat supports and defines the position of the sealing cap.

[0017] In some embodiments, the mounting base has a first abutment portion, and the sealing cap has a second abutment portion. The first abutment portion and the second abutment portion engage, allowing the mounting base and the sealing cap to be detachably connected. Thus, the engagement of the first abutment portion and the second abutment portion increases the connection strength between the mounting base and the sealing cap.

[0018] In some embodiments, the fixing seat has a third abutment portion disposed opposite to the first abutment portion, and the air-blocking valve has a fourth abutment portion. The third abutment portion and the fourth abutment portion abut against each other to limit the fixing seat. Thus, the third abutment portion and the fourth abutment portion cooperate to increase the fit strength between the fixing seat and the air-blocking valve.

[0019] In some embodiments, the sealing cap has a snap-fit, and the support cap has a protruding portion that engages with the snap-fit, allowing the support cap and the sealing cap to be detachably connected. Thus, the engagement of the protruding portion with the snap-fit ​​increases the connection strength of the support cap.

[0020] Compared with the prior art, the laparoscopic trocar of this invention has the following advantages:

[0021] This application incorporates a support cap, a sealing cap, and an air-blocking valve sequentially within the cannula. These components are designed to deform, reset, and self-close. After the puncture cone or other surgical instrument is inserted into the cannula, the support cap, sealing cap, and air-blocking valve all provide a wrapping effect, achieving a step-by-step sealing. The sealing cap further seals the cannula to enhance its airtightness. As the puncture cone or other surgical instrument gradually detaches or inserts into the cannula, the air-blocking valve first closes the cannula's cavity, followed by a step-by-step sealing effect through the sealing cap and support cap. This significantly reduces air leakage and improves the airtightness of the cannula during use. Attached Figure Description

[0022] Figure 1 This is a front view of the laparoscopic trocar of this utility model;

[0023] Figure 2 This is an exploded view of the laparoscopic trocar of this utility model;

[0024] Figure 3 This is a schematic diagram showing the disassembly of the sleeve and the annular locking ring in this utility model;

[0025] Figure 4 This is a schematic diagram showing the disassembled air-blocking valve and the fixed base in this utility model;

[0026] Figure 5 This is a schematic diagram showing the separation of the sealing cap and the support cap in this utility model.

[0027] Figure 6 This is a half-sectional view of the laparoscopic trocar of this utility model;

[0028] Figure 7 for Figure 6 Enlarged view of section A;

[0029] Figure 8 for Figure 6 Enlarged view of section B;

[0030] Figure 9 This is a three-dimensional view of the laparoscopic trocar of this utility model.

[0031] In the figure: 1-sleeve, 11-first extension, 12-second extension, 121-air injection hole, 122-insertion hole, 13-external thread, 14-first engaging part, 2-piercing cone, 21-plug, 3-sealing cap, 31-groove, 32-fourth engaging part, 4-ring lock ring, 41-second engaging part, 42-abutting edge, 43-third engaging part, 5-fixed seat, 51-first abutting part, 52-third abutting part, 53-limiting port, 6-air injection assembly, 61-air injection valve, 62-valve seat, 7-support cap, 71-protrusion, 8-sealing cap, 81-cap head, 82-second abutting part, 83-limiting block, 84-bayon, 9-air stop valve, 91-valve head, 92-abutting protrusion, 93-fourth abutting part. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] This utility model relates to a laparoscopic trocar, which is a medical device used in minimally invasive surgery. It can be used in conjunction with other surgical instruments, such as a laparoscope. It is generally used for single-use purposes and has safe and hygienic properties. The following embodiment takes the establishment of a patient's pneumoperitoneum as an example.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Figure 1 A laparoscopic trocar according to one embodiment of the present invention is schematically shown. Figure 1 , Figure 2 As shown, the laparoscopic trocar includes a cannula 1, a trocar 2, a sealing cap 3, a ring lock 4, and a fixing seat 5.

[0037] like Figures 1-3As shown, the cannula 1 (i.e., the outer sheath) has a hollow cavity structure inside, allowing the laparoscope and airflow to pass through. Its shape is a hollow tube. One end of the cannula 1 is a slanted insertion port for insertion, while the opposite end is an open structure for the insertion of the puncture cone 2. The end of the cannula 1 pointing towards the slanted insertion port is the lower side, and the opposite side is the upper side. During use, the cannula 1 is generally inserted downwards into the incision. The surface of the cannula 1 has an external thread 13 structure. After the cannula 1 is inserted into the incision, it can be screwed in through the external thread 13 structure, reducing gaps and preventing air leakage when the cannula 1 fits the incision, thus improving the airtightness of the cannula 1 during use. Near the upper side, the cannula 1 has a first extension 11 and a second extension 12 arranged opposite each other. The surface of the first extension 11 has a spaced-apart protrusion structure, and the arc-shaped structure of the first extension 11 is adapted to fit the human finger, making it easy for the doctor to apply force and control the cannula 1 during use. The second extension 12 is a structure that extends obliquely upward along the sleeve 1. During use, air needs to be injected and drained through the sleeve 1. Therefore, an air injection hole 121 is provided on the second extension 12. The air injection hole 121 can protrude the conduit structure of the protruding conduit structure from the second extension 12. The air injection hole 121 is connected to the internal cavity of the sleeve 1. The air injection hole 121 can be connected to an external air supply pipe so as to inject airflow into the sleeve 1.

[0038] Furthermore, such as Figure 3 , Figure 6As shown, an insertion hole 122 is provided on the second extension 12. The insertion hole 122 passes through the second extension 12 and communicates with the air injection hole 121 and the cavity of the cannula 1. In this embodiment, the disposable laparoscopic trocar also includes an air injection component 6. The air injection component 6 is detachably disposed in the insertion hole 122 to block the communication between the air injection hole 121 and the cavity of the cannula 1. Specifically, the air injection component 6 has an air injection valve 61 and a valve seat 62. The air injection valve 61 and the valve seat 62 can be detachably connected. The valve seat 62 has a handheld plate structure and forms a groove structure through a "U" insert structure. The valve seat 62 can be snapped into the insertion hole 122. When the air injection valve 61 is installed on the valve seat 62, the two can generate a gap or hole for airflow. The two sides of the valve seat 62 are through structures. The air injection valve 61 has a shape adapted to fit the air injection valve 61. Similarly, the air injection valve 61 has a hand-held plate structure and a solid "U"-shaped sheet structure. The air injection valve 61 can be inserted into the valve seat 62 to seal the insertion hole 122 and block the communication state of the air injection port 121. When the air injection valve 61 is installed in the valve seat 62, pressing the end of the air injection valve 61 brings it closer to the insertion hole 122 and the end of the air injection valve 61 abuts against the side wall of the second extension 12, so that the insertion hole 122 is in a communicating state, and the air injection port 121 is opened to maintain communication with the sleeve 1. When the end of the valve seat 62 is pressed, bringing the valve seat 62 closer to the insertion hole 122 and the end of the valve seat 62 abuts against the side wall of the second extension 12 (correspondingly, the air injection valve 61 is pushed), the insertion hole 122 is in a closed (blocked) state.

[0039] like Figure 2 As shown, the bottom end of the puncture cone 2 (i.e., the cannula) has a sharp bevel for breaking the incision. The puncture cone 2 has a rod-like structure, with a plug 21 at one end opposite the bevel. The plug 21 has a raised, rounded structure that conforms to the contour of the human hand to improve the feel during use. Optionally, the part of the puncture cone 2 near the bottom can be a hollow tube, and its bottom end can also have a through hole extending from the side to facilitate air injection and increase air permeability during injection. After the puncture cone 2 is inserted into the cannula 1, the plug 21 can abut against the upper side of the cannula 1, and the bottom side of the puncture cone 2 can extend to the bottom of the cannula 1 and be exposed outside the cannula 1; that is, the axial length of the puncture cone 2 is greater than the axial length of the cannula 1.

[0040] like Figure 3 , Figure 7As shown, the annular locking ring 4 is detachably mounted on the sleeve 1 for supporting and installing other components. The annular locking ring 4 has an annular structure that can lock and is exposed on the upper side of the sleeve 1. The sleeve 1 is provided with a first engaging part 14, which is an arc-shaped strip structure protruding on the outer side wall of the sleeve 1, and two of them are symmetrically arranged. The annular locking ring 4 is provided with a second engaging part 41, which is a notch structure formed on the inner side wall of the annular locking ring 4, and two of them are also symmetrically arranged. The shape of the second engaging part 41 is adapted to the first engaging part 14. When the annular locking ring 4 is installed on the sleeve 1, the first engaging part 14 and the second engaging part 41 engage to achieve a detachable connection. Furthermore, the annular locking ring 4 is provided with an abutting edge 42, which is a structure that extends and protrudes along the center of the annular locking ring 4 on the upper side. It can be understood that the abutting edge 42 forms a second engaging part 41. When the first engaging part 14 engages with the second engaging part 41, the abutting edge 42 can abut against the upper edge of the sleeve 1 to form a supporting function. Therefore, by installing the annular locking ring 4 on the sleeve 1, it can surround the upper edge of the sleeve 1.

[0041] The sleeve 1 is equipped with a support cap 7, a sealing cap 8, and an air-blocking valve 9, arranged sequentially from top to bottom. The bottom ends of the support cap 7, sealing cap 8, and air-blocking valve 9 are all deformable conical structures. For example... Figure 4 As shown, the upper side of the air-stopping valve 9 has a radially extending protrusion, which is the valve head 91. The valve head 91 abuts against the annular locking ring 4, thus supporting the air-stopping valve 9 on the annular locking ring 4. The remaining part of the air-stopping valve 9 extends into the cavity of the sleeve 1. Figure 8 As shown, further, there are two abutment protrusions 92 extending radially on the outer wall of the air-stop valve 9. The abutment protrusions 92 are symmetrically arranged and can abut against the inner wall of the sleeve 1, so that the air-stop valve 9 has a locking effect when it extends into the sleeve 1, so as to limit it in the sleeve 1.

[0042] like Figure 4 , Figure 7As shown, the fixing seat 5 is positioned between the sealing cap 8 and the air-stopping valve 9 to limit and support the sealing cap 8. The fixing seat 5 specifically adopts a ring-shaped through structure, which can be divided into upper and lower parts. The lower part has a protruding third abutment part 52, which has a conical cross-sectional shape. The valve head 91 of the air-stopping valve 9 has a fourth abutment part 93, which is positioned corresponding to the third abutment part 52. The fourth abutment part 93 has a groove structure with an inverted triangular conical cross-section. The third abutment part 52 can abut against the fourth abutment part 93 to limit the fixing seat 5 on the air-stopping valve 9. The fixing seat 5 also has a first abutment part 51, located on the upper part of the fixing seat 5. The first abutment part 51 is an annular arc structure along the upwardly protruding portion. Figure 5 As shown, the sealing cap 8 is a self-adjusting sealing cap 8, which has a cap head 81 for abutting against the fixing seat 5. The remaining part of the sealing cap 8 extends into the cavity of the sleeve 1. The cap head 81 of the sealing cap 8 has a second abutting part 82, which is specifically a groove structure. The first abutting part 51 can abut against the second abutting part 82, so that the sealing cap 8 is installed on the fixing seat 5 for positioning and support. The outer side wall of the sealing cap 8 has a radially protruding part, so that the sealing cap 8 can abut against the inner wall of the air-stopping valve 9, further increasing the installation and locking effect of the sealing cap 8. In addition, the sealing cap 8 can extend inside the air-stopping valve 9.

[0043] In some implementation methods, such as Figure 4 , Figure 5 As shown, the fixing base 5 is provided with a limiting port 53, which is a notch structure on the first abutment part 51. In this embodiment, there are three limiting ports 53 evenly distributed. The cap head 81 of the sealing cap 8 is provided with a limiting block 83 (dashed line part). The limiting block 83 is a protrusion structure formed in the second abutment part 82. The number and position of the limiting blocks 83 are adapted to the limiting ports 53. When the first abutment part 51 is engaged with the second abutment part 82, the limiting blocks 83 and the limiting ports 53 can be further engaged to further strengthen the connection strength between the sealing cap 8 and the fixing base 5.

[0044] like Figure 5 As shown, the support cap 7 is detachably installed in the sealing cap 8. Specifically, the support cap 7 has a protruding part 71, which is an annular protruding structure. The protruding part 71 is located in the middle of the support cap 7. The sealing cap 8 has a snap 84, which is an annular structure recessed in the inner wall of the sealing cap 8. The protruding part 71 can abut in the snap 84, so that the support cap 7 is supported by the sealing cap 8. After the support cap 7 is installed in the sealing cap 8, it can extend into the sealing cap 8. The support cap 7 is rigid and has a spreading function, while the sealing cap 8 is soft and has the ability to deform.

[0045] The sealing cap 3 has a cap-like structure with a through hole at the center of its top. The piercing cone 2 can pass through this hole and be inserted into the sleeve 1. The sealing cap 3 is detachably mounted on the sleeve 1. When the sealing cap 3 is installed on the sleeve 1, it can surround the support cap 7, the sealing cap 8, and the air-blocking valve 9 to seal the sleeve 1, thereby increasing the airtightness of the sleeve 1. The sealing cap 3 has an internal groove 31, which is annular in shape and conforms to the cap head 81 of the sealing cap 8. The cap head 81 of the sealing cap 8 can engage with the groove 31 to increase the fixing strength of the sealing cap 3. Furthermore, the inner wall of the sealing cap 3 can engage with the annular locking ring 4, and the sealing cap 3 can surround the annular locking ring 4, so that when the sealing cap 3 is installed on the sleeve 1, only the sealing cap 3 is exposed on the sleeve 1, thus protecting the support cap 7, the sealing cap 8, and the air-blocking valve 9. Further, as... Figure 7 , Figure 9 As shown, the annular locking ring 4 is provided with a third engaging portion 43, which is a structure that protrudes radially along the annular locking ring 4. The third engaging portion 43 is preferably trapezoidal in shape. The sealing cover 3 is provided with a fourth engaging portion 32, which is adapted to the shape of the third engaging portion 43. The fourth engaging portion 32 is specifically a notch structure with the opening facing downward. When the sealing cover 3 is engaged on the annular locking ring 4, the fourth engaging portion 32 is further engaged on the third engaging portion 43 to further increase the connection strength of the sealing cover 3.

[0046] Therefore, as Figure 6 As shown, when the support cap 7, sealing cap 8, and air-blocking valve 9 are installed on the cannula 1, in the cross-sectional view, the support cap 7, sealing cap 8, and air-blocking valve 9 all have an extension depth within the cannula 1 relative to the cannula 1. The extension depth is the dimension of the extension in the axial direction of the cannula 1. The extension depth of the support cap 7, sealing cap 8, and air-blocking valve 9 increases sequentially from top to bottom. The extension portions of the support cap 7, sealing cap 8, and air-blocking valve 9 are spaced apart from each other. When the puncture cone 2 is inserted into the cannula 1 through the sealing cap 3, the puncture cone 2 passes through the support cap 7, sealing cap 8, and air-blocking valve 9 in sequence. The support cap 7, sealing cap 8, and air-blocking valve 9 can wrap around the side wall of the puncture cone 2. The same applies when the laparoscope is inserted into the cannula 1. It can be seen that the air-blocking valve 9 is closest to the oblique opening of the puncture cone 2. Even if the oblique opening of the puncture cone 2 is separated from the air-blocking valve 9, the air-blocking valve 9 can reset and self-close to block the air leakage of the cannula 1, while the support cap 7 and sealing cap 8 can continue to stay in contact with the puncture cone 2. After the puncture cone 2 is completely removed from the cannula 1, the air-blocking valve 9, the sealing cap 8, and the support cap 7 deform and reset in sequence to self-close. The step-by-step self-closing method allows the air-blocking valve 9, the sealing cap 8, and the support cap 7 to provide a time difference for closure, effectively maintaining the airtightness of the cannula 1 when the puncture cone 2 is removed.

[0047] Procedure: After making an incision on the patient, first install the air injection assembly 6, sealing cap 3, etc., onto the cannula 1 to seal the air injection port 121 and the cannula 1. Then, insert the puncture cone 2 into the cannula 1, allowing the puncture cone 2 to pass sequentially through the support cap 7, sealing cap 8, and air choke valve 9, with the oblique opening of the puncture cone 2 exposed at the bottom of the cannula 1. At this point, the puncture cone 2 is used to enter the patient's abdominal cavity through the incision. During this process, the external thread 13 of the cannula 1 can be rotated to increase the airtightness between the cannula 1 and the incision and to provide some fixation for the cannula 1. Afterward, remove the puncture cone 2 and place it in the support... The cannula 1 is closed by the self-closing action of the cap 7, sealing cap 8, and air-blocking valve 9. The air-injection valve 61 is opened to connect the air-injection port 121 with the inside of the cannula 1. Air is injected into the air-injection port 121 to form an insufflation. Then the air-injection valve 61 is reset to close the air-injection port 121. At this time, a laparoscope can be inserted into the insufflation through the cannula 1. With the laparoscope wrapped by the air-blocking valve 9, sealing cap 8, and support cap 7, the insertion and withdrawal of the laparoscope will not easily cause the cannula 1 to leak air. Finally, after the laparoscope is withdrawn, the air-injection port 121 is opened by the air-blocking valve 9 to release the air and remove the cannula 1.

[0048] The above description is merely a preferred embodiment of the present utility model. To simplify the description, not all possible combinations of the various technical features in the above embodiments are described, and it is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A puncture device for laparoscopy, characterized by, include: A sleeve, in which a support cap, a sealing cap and an air-blocking valve are sequentially arranged, with the extension depth of the support cap, the sealing cap and the air-blocking valve increasing sequentially within the sleeve; A puncture cone, detachably inserted into the sleeve; A sealing cap is detachably mounted on the sleeve; the sealing cap surrounds the support cap, the sealing cap, and the air-blocking valve to seal the sleeve; When the puncture cone is inserted into the cannula, the support cap, the sealing cap, and the air-blocking valve enclose the puncture cone; when the puncture cone is removed from the cannula, the support cap, the sealing cap, and the air-blocking valve all reset and self-close.

2. The laparoscopic trocar according to claim 1, wherein It also includes an annular locking ring, which is detachably mounted on the sleeve, the air-blocking valve abutting against the annular locking ring, and the sealing cap snapping onto and surrounding the annular locking ring.

3. The laparoscopic trocar according to claim 2, wherein The sleeve is provided with a first engaging part, and the annular locking ring is provided with a second engaging part. The first engaging part and the second engaging part are engaged to make the annular locking ring and the sleeve detachably connected. The annular locking ring is also provided with an abutting edge. When the first engaging part and the second engaging part are engaged, the abutting edge abuts against the sleeve.

4. The laparoscopic trocar according to claim 2, wherein The annular locking ring is provided with a third engaging part, and the sealing cover is provided with a fourth engaging part. When the sealing cover surrounds the annular locking ring, the third engaging part and the fourth engaging part engage.

5. The laparoscopic trocar according to claim 1, wherein It also includes an air injection assembly disposed on the sleeve, the sleeve having an air injection port and an insertion hole communicating with the interior, the air injection assembly being detachably inserted into the insertion hole to block the air injection port.

6. The laparoscopic trocar according to claim 5, wherein The gas injection assembly has a gas injection valve and a valve seat, the valve seat being inserted into the insertion hole, and the gas injection valve being snapped onto the valve seat to block the gas injection hole.

7. The laparoscopic trocar according to claim 1, wherein It also includes a fixing seat, which is disposed between the sealing cap and the air-blocking valve to fix and support the sealing cap, and the sealing cap abuts against the inner wall of the air-blocking valve.

8. The laparoscopic trocar according to claim 7, wherein The fixing base is provided with a first abutting part, and the sealing cap is provided with a second abutting part. The first abutting part and the second abutting part abut against each other, so that the fixing base and the sealing cap are positioned and installed.

9. The laparoscopic trocar according to claim 8, wherein The fixed base is provided with a third abutting part that is disposed opposite to the first abutting part, and the air-blocking valve is provided with a fourth abutting part. The third abutting part abuts against the fourth abutting part to limit the fixed base.

10. The laparoscopic trocar according to claim 1, wherein The sealing cap has a snap-fit, and the support cap has a protruding part that abuts against the snap-fit ​​to support the support cap.

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