pneumostasis machine

Abstract

This invention discloses an insufflator with a connection port on its front cover. The connection port includes an interface seat and a locking cover. The rear edge of the locking cover is connected to the front edge of the interface seat via a friction adjustment mechanism. The friction adjustment mechanism includes a sliding member and a spring member. A set of sliding members is vertically inserted into the rear edge of the locking cover and can slide along the rear edge of the locking cover. The spring member passes through the back of the front edge of the interface seat and connects with the sliding members. The elastic force of the spring member drives the locking cover to maintain contact with the interface seat. At the same time, the locking cover can rotate relative to the interface seat through the sliding members. Rolling mechanisms are provided between the contact surfaces of the sliding members and the locking cover, and between the contact surfaces of the locking cover and the interface seat, to form rolling friction. A filter is inserted into the interface seat. The locking cover locks or unlocks the connection between the filter and the interface seat by rotation. This solution reasonably sets the friction between the locking cover and the interface seat by combining rolling friction and spring members.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to an insufflator. Background Technology

[0002] In laparoscopic minimally invasive surgery, filters are typically used in conjunction with insufflators. The insufflator delivers gas into the abdominal cavity. During surgery, the use of high-energy medical devices generates smoke in the surgical area. The filter's internal smoke extraction channel removes impurities such as grease from the smoke, returning the gas to the insufflator for gas circulation. Currently, the main connection method between filters and insufflators on the market is the rotary wrench type. This method uses a wrench-equipped tightening mechanism to directly fix the filter's inlet end to a dedicated interface on the front of the insufflator, achieving a seal through a compression sealing ring, as disclosed in announcement number CN221692398U. The rotary wrench type three-chamber filter generates friction during rotation. Excessive or insufficient friction can lead to misjudgment of positioning by the operator based on feel. When the friction is too high, the operator may think that it is tightened properly, but it is not actually tightened properly, which will lead to leakage and reduce the reliability of the seal. When the friction is too low, the operator may overtighten it because he thinks it is not tight enough, which will cause excessive compression of the sealing ring. This will cause the sealing ring to be permanently deformed, twisted or even sheared and broken, resulting in seal failure.

[0003] In summary, an improper configuration of friction directly affects the user experience and the sealing performance of the filter connection. Therefore, setting the appropriate friction force is a key issue that needs to be considered. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an insufflation machine.

[0005] The objective of this invention is achieved through the following technical solution: The pneumoperitoneum machine has a front cover with a connection port for connecting a filter. The connection port includes a coaxially arranged interface seat and a locking cover. The rear edge of the locking cover is connected to the front edge of the interface seat via a friction adjustment mechanism. The friction adjustment mechanism includes a sliding member and a spring member. A set of sliding members is vertically inserted into the rear edge of the locking cover and can slide along the rear edge of the locking cover. A set of spring members passes through the back of the front edge of the interface seat and is connected to the set of sliding members one by one. The elastic force of the spring members drives the locking cover to maintain contact with the interface seat. At the same time, the locking cover can rotate relative to the interface seat through the sliding members. Rolling mechanisms are provided between the contact surfaces of the sliding members and the locking cover, and between the contact surfaces of the locking cover and the interface seat, to form rolling friction. The filter is inserted into the interface seat. The locking cover locks or unlocks the connection between the filter and the interface seat by rotation.

[0006] Preferably, the sliding member includes a rod and a head, the locking cover has a set of sliding grooves evenly distributed along its rear end edge, the rod is slidably inserted into the sliding groove, a limiting rod is fixed between the two ends of the front end face of the sliding groove, and the head is movably engaged between the limiting rod and the front end face of the sliding groove.

[0007] Preferably, a strip ball is rotatably embedded on the back of the head, and the strip ball rolls along the front end face of the groove.

[0008] Preferably, a set of first balls is rotatably embedded on the back of the head, the set of first balls is arranged along the sliding direction of the head, and each first ball rolls along the front end face of the slide groove, and a first limiting slide groove matching the first ball is formed on the front end face of the slide groove.

[0009] Preferably, a set of second balls is rotatably embedded on the front surface of the front edge of the interface seat, and the set of second balls is evenly distributed circumferentially and faces the rear end face of the locking cover. When the locking cover rotates, the set of second balls rolls along the rear end face of the locking cover.

[0010] Preferably, a matching limiting plate is connected to the back of the slide groove, and a set of third balls is provided between the back of the slide groove and the limiting plate. A limiting hole is provided on the limiting plate, and a third ball is rotatably embedded in each limiting hole. A second limiting slide groove matching the rolling trajectory of the set of third balls is recessed on the front edge of the interface seat.

[0011] Preferably, the elastic element includes a connecting screw and an adjusting spring. The front edge of the interface seat is provided with a set of insertion holes. The connecting screw is inserted into the insertion holes and screwed to the rod portion. The adjusting spring is sleeved on the connecting screw, and its two ends abut against the rear edge of the interface seat and the end of the connecting screw to apply a pulling force perpendicular to the interface seat to the locking cover and drive the locking cover to remain in contact with the interface seat.

[0012] Preferably, a sheet metal part is provided inside the front cover, and the interface seat is embedded in the sheet metal part. An arc-shaped groove concentric with the port of the interface seat is opened on one side of the port. A connecting rod that can slide along the arc-shaped groove is vertically inserted in the arc-shaped groove. A fixing rod is fixed on the back of the sheet metal part. A tension spring is provided between the rear ends of the fixing rod and the connecting rod. A fixing hole is provided on the rear end face of the locking cover. The front end of the connecting rod is inserted into the fixing hole so that the locking cover can be driven to reset under the tension of the tension spring.

[0013] Preferably, the inner wall of the interface seat is provided with a fixing groove, and the inner wall of the locking cover is provided with a push-stop groove. In the initial state, the push-stop groove is aligned with and connected to the fixing groove, so that the locking block protruding on the outer wall of the filter is inserted into the fixing groove. A wrench is fixedly connected to one side of the front end of the locking cover. The wrench drives the locking cover to rotate synchronously, and makes the push-stop groove and the fixing groove misaligned, so as to limit the locking block in the fixing groove.

[0014] Preferably, the push-stop groove is rotated to confine the locking block within the fixed groove, and one side wall of the push-stop groove extends obliquely to form a driving inclined wall, which abuts against the tail end of the locking block to drive the locking block into the fixed groove.

[0015] The beneficial effects of this invention are mainly reflected in: 1. The locking cover and the interface seat are connected by a sliding component and a spring component. This ensures that the locking cover and the interface seat are coaxially aligned and can rotate relative to the interface seat. The static friction between the locking cover and the sliding component, and between the locking cover and the interface seat, is transformed into rolling friction to prevent excessive friction between the locking cover and the interface seat. The spring component pulls the locking cover, keeping it in contact with the interface seat to prevent insufficient friction. The combination of these two methods creates a suitable level of friction between the locking cover and the interface seat for practical use. 2. Rolling balls are used to generate rolling friction, which improves the smoothness of the sliding of the sliding member and the smoothness of the rotation of the locking cover relative to the interface seat. The rolling mechanism provides a variety of feasible embodiments for selection to meet actual needs. 3. An adjusting spring is provided to provide the clamping force for the drive locking cover to abut against the interface seat. The adjusting spring has a preload, which can be adjusted by adjusting the screw distance between the connecting screw and the rod, thereby adjusting the clamping force and avoiding excessive clamping force that would lead to excessive friction. 4. A groove is provided on the edge of the locking cover to make the installation of the sliding component visible, so as to facilitate the pre-installation of the sliding component and facilitate its connection with the elastic component; 5. A tension spring is provided to pull the locking cover, so that the push groove and the fixing groove are automatically aligned without external force, so that the user can insert the filter. This eliminates the need for users to reset after use, simplifying the operation and making it more convenient for actual use. Attached Figure Description

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 : An exploded view of an embodiment of the present invention; Figure 2 : An explosion diagram from another direction according to an embodiment of the present invention; Figure 3 : Partial schematic diagram of an embodiment of the present invention; Figure 4 : A schematic diagram of the connection between the sliding member and the elastic member in an embodiment of the present invention; Figure 5 Schematic diagram of the second embodiment of the rolling mechanism in this invention: Figure 6 : A cross-sectional view of the second embodiment of the rolling mechanism in this invention; Figure 7 : A schematic diagram of the locking cover in its initial state in an embodiment of the present invention; Figure 8 : A schematic diagram of the locking cover after rotation in an embodiment of the present invention; Figure 9 : Partial schematic diagram of an embodiment of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0018] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0019] like Figures 1 to 9 As shown, this invention discloses an insufflator, whose front cover is provided with a connection port for connecting a filter 5. The connection port includes an interface seat 1 and a locking cover 2 arranged coaxially. The rear edge of the locking cover 2 is connected to the front edge of the interface seat 1 by a friction adjustment mechanism. The friction adjustment mechanism includes a sliding member 3 and a spring member 4. A set of sliding members 3 are vertically inserted into the rear edge of the locking cover 2 and can slide along the rear edge of the locking cover 2. A set of spring members 4 are located at the front edge of the interface seat 1. The back of the filter 5 is inserted and connected to a set of sliding members 3 one by one. The elastic force of the elastic member 4 drives the locking cover 2 to keep it in contact with the interface seat 1. At the same time, the locking cover 2 can rotate relative to the interface seat 1 through the sliding member 3. Rolling mechanisms are provided between the contact surfaces of the sliding member 3 and the locking cover 2, and between the contact surfaces of the locking cover 2 and the interface seat 1 to form rolling friction. The filter 5 is inserted into the interface seat 1. The locking cover 2 locks or unlocks the connection between the filter 5 and the interface seat 1 by rotation.

[0020] This design uses a sliding member 3 and an elastic member 4 to connect the locking cover 2 and the interface seat 1. This ensures that the locking cover 2 and the interface seat 1 are coaxially aligned and can rotate relative to the interface seat 1. Furthermore, it transforms the static friction between the contact surfaces of the locking cover 2 and the sliding member 3, and between the locking cover 2 and the interface seat 1, into rolling friction, thus preventing excessive friction between the locking cover 2 and the interface seat 1. The elastic member 4 pulls the locking cover 2, maintaining contact between the locking cover 2 and the interface seat 1, preventing insufficient friction. The combination of these two methods creates a suitable level of friction between the locking cover 2 and the interface seat 1 for practical use.

[0021] The sliding member 3 includes a rod portion 301 and a head portion 302. The locking cover 2 has a set of grooves 201 evenly distributed along its rear edge. The rod portion 301 is slidably inserted into the groove 201. A limiting rod 202 is fixed between the two ends of the front end face of the groove 201. The head portion 302 is movably engaged between the limiting rod 202 and the front end face of the groove 201. The locking cover 2 has grooves 201 on its side, making the installation of the sliding member 3 visible and facilitating pre-installation of the sliding member 3 for easy connection with the elastic member 4. Preferably, the two ends of the limiting rod 202 are respectively connected to the inner and outer sides of the end of the groove 201, intersecting with the opening of the groove 201 to better limit the sliding of the head portion 302 and prevent the head portion 302 from dislodging from the groove 201 during sliding. The two ends of the limiting rod 202 can be fixed to the two ends of the slide groove 201 in any suitable way, preferably in a detachable way, such as screw connection or snap connection.

[0022] The elastic element 4 includes a connecting screw 401 and an adjusting spring 402. A set of insertion holes 102 are provided on the front edge of the interface seat 1. The connecting screw 401 is inserted into the insertion holes 102 and screwed onto the rod portion 301. The adjusting spring 402 is sleeved on the connecting screw 401, with its two ends abutting between the rear edge of the interface seat 1 and the end of the connecting screw 401, to apply a pulling force perpendicular to the interface seat 1 to the locking cover 2, and drive the locking cover 2 to remain in contact with the interface seat 1. The adjusting spring 402 is provided to provide the clamping force driving the locking cover 2 to abut against the interface seat 1. The adjusting spring 402 has a pre-compression amount, and the pre-compression amount of the adjusting spring 402 can be adjusted by adjusting the screwing distance between the connecting screw 401 and the rod portion 301, thereby adjusting the clamping force and avoiding excessive clamping force leading to excessive friction.

[0023] Furthermore, the rolling mechanism has a variety of feasible embodiments for selection to suit specific needs.

[0024] As shown in Figure 1 and Figure 4 In the first embodiment: a strip-shaped ball 303 is rotatably embedded on the back side of the head 302, and the strip-shaped ball 303 rolls along the front end face of the slide groove 201. The strip-shaped ball 303 can be one or more, so that the contact surface between the head 302 and the front end face of the slide groove 201 changes from the original static friction to dynamic friction, thereby improving the smoothness of the sliding member 3.

[0025] A set of second balls 101 are rotatably embedded on the front surface of the front edge of the interface seat 1. The set of second balls 101 are evenly distributed circumferentially and face the rear end face of the locking cover 2. When the locking cover 2 is rotated, the set of second balls 101 rolls along the rear end face of the locking cover 2.

[0026] like Figure 5 and Figure 6 As shown, in the second embodiment: a set of first balls 304 are rotatably embedded on the back of the head 302. The set of first balls 304 are arranged along the sliding direction of the head 302, and each first ball 304 rolls along the front end face of the slide groove 201. A first limiting slide groove 206 matching the first ball 304 is formed on the front end face of the slide groove 201. The setting of the first limiting slide groove 206 can further limit the rolling direction of the set of first balls 304, thereby improving the rolling smoothness of the first balls 304.

[0027] A matching limiting plate 207 is connected to the back of the slide groove 201. A set of third ball bearings 208 are spaced apart between the back of the slide groove 201 and the limiting plate 207. The limiting plate 207 has limiting holes 2071, and one of the third ball bearings 208 is rotatably embedded in each limiting hole 2071. A second limiting slide groove 209 is recessed on the front edge of the interface seat 1, matching the rolling trajectory of the set of third ball bearings 208. The limiting plate 207 limits the position of the third ball bearings 208 to prevent them from coming out. The second limiting slide groove 209 limits the rolling trajectory of the third ball bearings 208, improving the smoothness of the sliding member 3.

[0028] Furthermore, a sheet metal part 6 is provided inside the front cover, and the interface seat 1 is embedded in the sheet metal part 6. The sheet metal part 6 is used to connect and set the interface seat 1 to ensure the stability of the interface seat 1, so that the front cover does not need to bear the fastening requirements.

[0029] An arc-shaped groove 104, concentric with the port of the interface seat 1, is formed on one side of the port. A connecting rod 105, which can slide along the arc-shaped groove 104, is vertically inserted into the groove. A fixing rod 601 is fixedly mounted on the back of the sheet metal part 6. A tension spring 7 is provided between the rear ends of the fixing rod 601 and the connecting rod 105. A fixing hole 203 is provided on the rear end face of the locking cover 2. The front end of the connecting rod 105 is inserted into the fixing hole 203 so that the locking cover 2 can be reset under the tension of the tension spring 7. The tension spring 7 is used to pull the locking cover 2, so that it automatically resets without external force, making it convenient for the user to insert the filter. This eliminates the need for users to reset after use, simplifying the operation and making it convenient for practical use.

[0030] Furthermore, a fixing groove 103 is provided on the inner wall of the interface seat 1, and a push-stop groove 204 is provided on the inner wall of the locking cover 2. In the initial state (here, "initial state" refers to the state when no external force drives the locking cover 2 to rotate), the push-stop groove 204 is aligned with and connected to the fixing groove 103, so that the locking block protruding on the outer wall of the filter 5 is inserted into the fixing groove 103. A wrench 205 is fixedly attached to one side of the front end of the locking cover 2 to facilitate the operator to drive the locking cover 2 to rotate. The wrench 205 drives the locking cover 2 to rotate synchronously, and causes the push-stop groove 204 to be misaligned with the fixing groove 103, so as to confine the locking block within the fixing groove 103.

[0031] Specific examples Figure 7 and Figure 8 As shown, in the initial state, the push-stop groove 204 is aligned and connected with the fixing groove 103. At this time, the filter 5 can be directly inserted into the interface seat 1, and the locking block will be inserted into the push-stop groove 204 and can be inserted into the fixing groove 103 along the push-stop groove 204. However, manual insertion at this time cannot guarantee that the filter 5 is fully inserted into the interface seat 1 to achieve a sealed connection. Therefore, one side of the push-stop groove 204 extends obliquely to form a driving inclined wall 2041. The driving inclined wall 2041 abuts against the tail end of the locking block to drive the locking block into the fixing groove 103. This structural arrangement allows the locking block to be smoothly and effortlessly locked into the fixing groove 103 by utilizing the rotation of the locking cover 2 and the structure of the driving inclined wall 2041 to achieve fixation. The push-stop groove 204 rotates so that its end wall abuts against the tail end of the locking block, thereby sealing the locking block and confining it within the fixing groove 103 to prevent it from retracting, thus achieving a locking function. Simultaneously, the elastic force of the adjusting spring 402 of the elastic member 4 further tightens the locking cover 2 against the interface seat 1, further ensuring the limiting effect of the locking cover 2 on the locking block and preventing the locking block from retracting and driving the locking cover 2 to reverse. This ensures the stability of the filter 5 when it is locked within the interface seat 1 during use.

[0032] Preferably, the locking cover 2 rotates clockwise to better conform to ergonomic usage habits and structural layout, ensuring that the extension direction of the wrench 205 does not obstruct the screen position on the front cover. Furthermore, the front cover is provided with a fan-shaped groove that matches the wrench 205 to accommodate it, and the fan-shaped structure limits the pivot range of the wrench 205 to further optimize the operating feel.

[0033] Furthermore, the locking blocks include at least two types of first locking blocks 501 and second locking blocks 502 with different widths to define the insertion direction of the filter 5. The inner wall widths of the push groove 204 and the fixing groove 103 are adapted to the locking blocks to be inserted. The two types of first locking blocks 501 and second locking blocks 502 with different widths can prevent mistaken insertion and define the insertion direction of the filter 5, ensuring the alignment and connection of the air passage after insertion. Specifically, according to the principle of three points determining a plane, three locking blocks are preferably provided on the outer wall of the filter 5, namely one first locking block 501 and two second locking blocks 502. The first locking block 501 is the widest and is located at the top of the filter 5 for easy observation. The two second locking blocks 502 are respectively located on both sides, and the included angle between the three locking blocks is consistent to balance the force on the outer wall of the filter 5 and prevent skewing.

[0034] The rear end face of the interface seat 1 is provided with a set of air holes 106 that communicate with the air passage of the filter 5. The filter 5 has an air passage that mates with the air holes 106. The set of air holes 106 specifically includes an air injection hole, a smoke exhaust hole, and an airtight hole. The front end face of the filter 5 is provided with a sealing ring to seal with the set of air holes 106.

[0035] The pneumoperitoneum machine also includes other components that cooperate with the filter 5. These are existing technologies and are not the focus of this solution, so they will not be described in detail here.

[0036] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0037] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. An insufflator, wherein a connection port for docking a filter (5) is provided on its front cover, the connection port comprising an interface seat (1) and a locking cover (2) arranged coaxially, characterized in that: The rear edge of the locking cover (2) is connected to the front edge of the interface seat (1) via a friction adjustment mechanism. The friction adjustment mechanism includes a sliding member (3) and a spring member (4). A set of the sliding members (3) are vertically inserted into the rear edge of the locking cover (2) and can slide along the rear edge of the locking cover (2). A set of the spring members (4) are inserted from the back of the front edge of the interface seat (1) and connected to the set of sliding members (3) one by one. The elastic force of the spring member (4) drives the locking cover (2) to slide along the rear edge of the interface seat (1). The locking cover (2) abuts against the interface seat (1), and the locking cover (2) can rotate relative to the interface seat (1) via the sliding member (3). Rolling mechanisms are provided between the contact surfaces of the sliding member (3) and the locking cover (2), and between the contact surfaces of the locking cover (2) and the interface seat (1) to form rolling friction. The filter (5) is inserted into the interface seat (1). The locking cover (2) locks or unlocks the connection between the filter (5) and the interface seat (1) by rotation.

2. The pneumoperitoneum machine according to claim 1, characterized in that: The sliding member (3) includes a rod (301) and a head (302). The locking cover (2) has a set of sliding grooves (201) evenly distributed along its rear edge. The rod (301) is slidably inserted into the sliding groove (201). A limiting rod (202) is fixed between the two ends of the front end face of the sliding groove (201). The head (302) is movably locked between the limiting rod (202) and the front end face of the sliding groove (201).

3. The pneumoperitoneum machine according to claim 2, characterized in that: The back of the head (302) is rotatably fitted with a strip ball (303), which rolls along the front end face of the groove (201).

4. The pneumoperitoneum machine according to claim 2, characterized in that: A set of first balls (304) is rotatably embedded on the back of the head (302). The set of first balls (304) is arranged along the sliding direction of the head (302), and each first ball (304) rolls along the front end face of the slide groove (201). A first limiting slide groove (206) matching the first ball (304) is provided on the front end face of the slide groove (201).

5. The pneumoperitoneum machine according to claim 3, characterized in that: A set of second balls (101) is rotatably embedded on the front surface of the front edge of the interface seat (1), and the set of second balls (101) is evenly distributed in the circumferential direction and faces the rear end face of the locking cover (2). When the locking cover (2) rotates, the set of second balls (101) rolls along the rear end face of the locking cover (2).

6. The pneumoperitoneum machine according to claim 4, characterized in that: The back of the slide (201) is connected to a matching limiting plate (207). A set of third balls (208) is spaced between the back of the slide (201) and the limiting plate (207). The limiting plate (207) has limiting holes (2071). Each limiting hole (2071) contains a third ball (208) that can be rolled. The front edge of the interface seat (1) is recessed with a second limiting slide (209) that matches the rolling trajectory of the set of third balls (208).

7. The pneumoperitoneum machine according to claim 5 or 6, characterized in that: The elastic element (4) includes a connecting screw (401) and an adjusting spring (402). A set of insertion holes (102) are provided on the front edge of the interface seat (1). The connecting screw (401) is inserted into the insertion hole (102) and screwed to the rod (301). The adjusting spring (402) is sleeved on the connecting screw (401), and its two ends abut against the rear edge of the interface seat (1) and the end of the connecting screw (401) to apply a pulling force perpendicular to the interface seat (1) to the locking cover (2) and drive the locking cover (2) to keep abutting against the interface seat (1).

8. The pneumoperitoneum machine according to claim 7, characterized in that: A sheet metal part (6) is provided inside the front cover. The interface seat (1) is embedded in the sheet metal part (6). An arc-shaped groove (104) concentric with the port is opened on one side of the port of the interface seat (1). A connecting rod (105) that can slide along the arc-shaped groove (104) is vertically inserted in the arc-shaped groove (104). A fixing rod (601) is fixed on the back of the sheet metal part (6). A tension spring (7) is provided between the rear ends of the fixing rod (601) and the connecting rod (105). A fixing hole (203) is provided on the rear end face of the locking cover (2). The front end of the connecting rod (105) is inserted into the fixing hole (203) so that the locking cover (2) can be reset under the tension of the tension spring (7).

9. The pneumoperitoneum machine according to claim 8, characterized in that: The inner wall of the interface seat (1) is provided with a fixing groove (103), and the inner wall of the locking cover (2) is provided with a push groove (204). In the initial state, the push groove (204) is aligned with and connected to the fixing groove (103), so that the card block protruding on the outer wall of the filter (5) is inserted into the fixing groove (103). A wrench (205) is fixed to one side of the front end of the locking cover (2). The wrench (205) drives the locking cover (2) to rotate synchronously, and makes the push groove (204) and the fixing groove (103) misaligned, so as to limit the card block in the fixing groove (103).

10. The pneumoperitoneum machine according to claim 9, characterized in that: The push-stop groove (204) is rotated to confine the locking block within the fixed groove (103), and one side of the push-stop groove (204) extends obliquely to form a driving inclined wall (2041), which abuts against the tail end of the locking block to drive the locking block into the fixed groove (103).

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