Visual mouth-nose exchange device

Abstract

The invention relates to the technical field of medical instruments, and discloses a visual mouth-nose exchange device which comprises a laryngoscope body used for observing the position of a catheter and a clamping mechanism, the laryngoscope body comprises a display end and a camera shooting end, the clamping mechanism comprises a clamping assembly and a driving assembly, the clamping assembly is installed at the camera shooting end, and the driving assembly is installed on the display end. The driving assembly is in transmission connection with the clamping assembly, the clamping assembly is used for clamping a guide pipe, and the driving assembly is used for driving the clamping assembly to work. The problems that in the prior art, the success rate of inserting a catheter into a lasso is low, and medical workers need to operate many times to complete mouth-nose exchange are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a visualized mouth-nose exchange device. Background Art

[0002] The oral-nasal exchange device is mainly used to exchange the catheter inserted through the mouth (such as nasobiliary duct, jejunal feeding tube, etc.) into the nasal cavity to reduce the patient's discomfort and increase their cooperation.

[0003] In the prior art, the oral-nasal exchange device mainly includes a lasso and a cannula. The cannula is a hollow tube. The lasso is folded back and passed through the cannula to form a lasso at one end of the cannula. The front end of the cannula may be provided with a lasso guide plug to maintain the shape of the lasso and facilitate the insertion of the catheter. When in use, the lasso at one end of the cannula is inserted through the oral cavity and pressed against the posterior wall of the pharynx. The catheter is inserted into the oral cavity through the nasal cavity until its front end is caught by the lasso. By pulling the lasso, the lasso is tightened and the front end of the catheter is caught. The cannula is slowly pulled out of the oral cavity, and the catheter is taken out at the same time, thereby completing the oral-nasal exchange.

[0004] When used, the success rate of catheter insertion lasso is low. In most cases, medical staff need to perform multiple operations to complete the mouth-nose exchange. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a visualized mouth-nose exchange device to solve the problem in the prior art that the success rate of catheter insertion lasso is low and medical staff need to perform multiple operations to complete the mouth-nose exchange.

[0006] The present invention solves the above technical problems by the following technical means: A visualized oral-nasal exchange device comprises a laryngoscope body and a clamping mechanism for observing the position of a catheter, wherein the laryngoscope body comprises a display end and a camera end, and the clamping mechanism comprises a clamping assembly and a driving assembly, wherein the clamping assembly is mounted on the camera end, and the driving assembly is transmission-connected to the clamping assembly, wherein the clamping assembly is used to clamp the catheter, and wherein the driving assembly is used to drive the clamping assembly to work.

[0007] By setting the above structure, the camera end can capture the position of the internal catheter, and then display it to the medical staff for viewing. When the medical staff drives the clamping assembly to clamp the catheter through the driving assembly, the position of the catheter and the clamping assembly can be adjusted in real time so that the clamping assembly can clamp the catheter, thereby improving the success rate of clamping the catheter.

[0008] Furthermore, a shell is detachably mounted on the camera end of the laryngoscope body, and the clamping assembly and the driving assembly are respectively installed at both ends of the shell, the clamping assembly is located at the end close to the camera end, and the driving assembly is located at the end close to the display end.

[0009] By providing the above structure, when removing the shell, the clamping assembly and the driving assembly can be removed together, which is convenient for replacement.

[0010] Furthermore, the clamping assembly includes two clamping members with the same structure, one end of the clamping member is rotatably connected to the shell, and the other end is located outside the shell. The two clamping members are respectively arranged on both sides of the shell, and the two clamping members are both transmission-connected to the driving assembly, and the driving assembly is used to drive the two clamping members to rotate towards each other for clamping.

[0011] By setting the above structure, the driving assembly drives the two clamping members to rotate towards each other to clamp the catheter. Compared with the clamping method of tightening the lasso in the prior art, the catheter is easier to enter the area between the two clamping members, further improving the success rate of catheter clamping.

[0012] Furthermore, installation cavities are provided on both sides of the shell, and the clamp is rotatably connected with an installation column, the installation column is located in the installation cavity, and a sliding groove is opened in the installation cavity along the length direction of the installation cavity, and the installation column is slidably installed in the sliding groove.

[0013] By setting the above structure, the mounting column is slid toward the inside of the mounting cavity, so that the clamping member can be stored in the mounting cavity. On the one hand, it can prevent the clamping member from causing damage to the inner wall of the oral cavity when the camera end is extended into the oral cavity. On the other hand, it can prevent the clamping member from blocking the field of view of the camera end.

[0014] Furthermore, the driving assembly includes two driving members with the same structure, and driving cavities are opened on both sides of the shell. The end of the driving cavity close to the display end passes through the shell, one end of the driving member is slidably set in the driving cavity, and the other end protrudes out of the shell, the driving cavity is connected with the installation cavity, and a guide structure is provided on the clamping member. When the driving member squeezes the guide structure, the clamping member is forced to rotate toward the direction close to the camera end.

[0015] By setting the above structure, when in use, the driving member is pushed towards the clamping member until the driving member squeezes the guide structure, forcing the clamping member to rotate towards the camera end, thereby realizing the two clamping members rotating towards each other and clamping the catheter, which is simple and convenient to operate.

[0016] Furthermore, a slot is provided on the inner side surface of the driving member, a driving head is slidably connected to the slot, a first elastic member is provided between the driving head and the driving member, the driving head abuts against the end of the clamping member, the driving head is used to push the clamping member out of the installation cavity, and when the driving member moves toward the clamping member, the driving head is pushed to move by the first elastic member.

[0017] By setting the above structure, when the driving member moves toward the clamping member, the clamping member is first pushed out of the installation cavity by the first elastic member and the driving head until the clamping member moves to the maximum position, and then the driving member continuously compresses the first elastic member and squeezes the guide structure to force the clamping member to rotate toward the camera end. There is no need to perform a separate operation to push the clamping member out of the installation cavity, which reduces the difficulty of operation.

[0018] Furthermore, a connecting rope is provided between the end of the driving member and the clamping member, and when the driving member moves toward the display end, the driving member drives the clamping member to move toward the display end through the connecting rope.

[0019] By providing the above structure, when the driving member is moved toward the display end, the driving member drives the clamping member to move toward the display end through the connecting rope, and automatically retracts the clamping member into the installation cavity.

[0020] Furthermore, the connecting rope is an elastic rope, one end of which is fixedly connected to the end of the driving member, and the other end of which is fixedly connected to the guide structure.

[0021] By setting the above structure, the first elastic member and the drive head push the clamping member out of the installation cavity until the clamping member moves to the maximum position. The elastic rope rotates the clamping member away from the camera end, increasing the angle between the two clamping members so as to clamp the catheter.

[0022] Furthermore, a clamping head is provided at one end of the clamping member away from the driving member. When the two clamping members rotate toward each other to the maximum position, the two clamping heads are parallel. An accommodating groove is provided at one end of the installation cavity away from the driving member, and the accommodating groove is used to accommodate the clamping head.

[0023] By providing the above structure, when the two clamping members rotate toward each other to the maximum position, the two clamping heads are parallel, thereby increasing the contact surface between the clamping member and the catheter and improving the clamping stability of the catheter by the clamping member.

[0024] Furthermore, the two driving members are fixedly connected to the same push rod at one end away from the clamping member, and a limit block is provided at one end of the driving member close to the push rod. A second elastic member is provided between the limit block and the shell, and the limit block is used to limit the maximum position of the driving member moving toward the clamping member, and the second elastic member is used to automatically reset the driving member.

[0025] By setting the above structure, the push rod can push the two driving members to move at the same time, thereby improving the convenience of operation.

[0026] Beneficial effects of the present invention: 1. The present invention sets a laryngoscope body, and the camera end can take pictures of the position of the internal catheter, and then display the pictures to medical staff. When the medical staff drives the clamping assembly to clamp the catheter through the driving assembly, the position of the catheter and the clamping assembly can be adjusted in real time so that the clamping assembly can clamp the catheter, thereby improving the success rate of clamping the catheter.

[0027] 2. The present invention provides a shell, and when the shell is removed, the clamping assembly and the driving assembly can be removed together, which is convenient for replacement.

[0028] 3. The present invention provides a clamping member, and the driving assembly drives the two clamping members to rotate toward each other to clamp the catheter. Compared with the clamping method of tightening the lasso in the prior art, the catheter is easier to enter the area between the two clamping members, further improving the success rate of catheter clamping.

[0029] 4. The present invention provides an installation cavity, an installation column and a slide groove, and slides the installation column toward the inside of the installation cavity, so that the clamping part can be stored in the installation cavity. On the one hand, it can prevent the clamping part from causing damage to the inner wall of the oral cavity when the camera end is extended into the oral cavity. On the other hand, it can prevent the clamping part from blocking the field of view of the camera end. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a visualized mouth-nose exchange device of the present invention; Figure 2 It is a schematic diagram of the structure of a clamping assembly extending out of a housing in a visualized mouth-nose exchange device of the present invention; Figure 3 It is a schematic diagram of the disassembled structure of a visualized mouth-nose exchange device of the present invention; Figure 4 It is a structural schematic diagram of a clamping assembly and a driving assembly in a visual mouth-nose exchange device of the present invention; Figure 5 It is a schematic diagram of the cross-sectional structure of the end of a shell in a visualized oral-nasal exchange device of the present invention; Figure 6 It is a structural schematic diagram of a clamping state of a clamping component in a visual mouth-nose exchange device of the present invention; in, 1. laryngoscope body; 11. display end; 12. camera end; 13. grip section; 14. protrusion; 2. Clamping assembly; 21. Clamping member; 211. Mounting column; 22. Guide structure; 23. Clamping head; 3. driving assembly; 31. driving member; 311. notch; 32. driving head; 33. first elastic member; 34. connecting rope; 35. push rod; 36. limit block; 37. second elastic member; 4. Shell; 41. Card slot; 42. Perspective area; 43. Installation cavity; 44. Slide groove; 45. Drive cavity; 46. Accommodation groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-Figure 6 As shown, a visualized oral-nasal exchange device of the present invention comprises a laryngoscope body 1 and a clamping mechanism for observing the position of a catheter, the laryngoscope body 1 comprises a display end 11 and a camera end 12, the clamping mechanism comprises a clamping assembly 2 and a driving assembly 3, the clamping assembly 2 is mounted on the camera end 12, the driving assembly 3 is in transmission connection with the clamping assembly 2, the clamping assembly 2 is used to clamp the catheter, and the driving assembly 3 is used to drive the clamping assembly 2 to work. The camera end 12 can take pictures of the position of the internal catheter, and then display the display end 11 for medical staff to view, and when the medical staff drives the clamping assembly 2 to clamp the catheter through the driving assembly 3, the position of the catheter and the clamping assembly 2 can be adjusted in real time, so that the clamping assembly 2 can clamp the catheter, thereby improving the success rate of clamping the catheter.

[0033] In this embodiment, a grip section 13 is provided between the display end 11 and the camera end 12 , and medical personnel can hold the visualized mouth-nose exchange device of this embodiment through the grip section 13 .

[0034] In this embodiment, a housing 4 is detachably mounted on the camera end 12 of the laryngoscope body 1, and the clamping assembly 2 and the driving assembly 3 are respectively mounted on the two ends of the housing 4, the clamping assembly 2 is located at one end close to the camera end 12, and the driving assembly 3 is located at one end close to the display end 11. In some other embodiments, the clamping assembly 2 and the driving assembly 3 can also be directly mounted on the laryngoscope body 1. In this embodiment, by providing a detachable housing 4, when the housing 4 is removed, the clamping assembly 2 and the driving assembly 3 can be removed together, which is convenient for replacement. Both sides of the laryngoscope body 1 of this embodiment are provided with protrusions 14, and both sides of the housing 4 are provided with card slots 41. The housing 4 is inserted into the protrusions 14 through the card slots 41 to achieve a detachable connection between the housing 4 and the laryngoscope body 1. In some other embodiments, the detachable connection is achieved by bonding, magnetic attraction, etc.

[0035] In this embodiment, the housing 4 is arranged to be closed near the camera end 12, protecting the laryngoscope body 1 inside to prevent the laryngoscope body 1 from direct contact with the patient. A perspective area 42 (such as a transparent plate) is arranged at the end surface of the housing 4 corresponding to the camera end 12, and the perspective area 42 is arranged to prevent the housing 4 from affecting the camera end 12 from photographing the position of the internal catheter.

[0036] In this embodiment, the clamping assembly 2 includes two clamping members 21 with the same structure, one end of the clamping member 21 is rotatably connected to the housing 4, and the other end is located outside the housing 4. The two clamping members 21 are respectively arranged on both sides of the housing 4, and the two clamping members 21 are both transmission-connected to the driving assembly 3, and the driving assembly 3 is used to drive the two clamping members 21 to rotate toward each other for clamping. In some other embodiments, a lasso can also be used for clamping. Compared with the clamping method of tightening the lasso in the prior art, the catheter in this embodiment is easier to enter the area between the two clamping members 21, further improving the success rate of catheter clamping.

[0037] In this embodiment, both sides of the housing 4 are provided with mounting cavities 43, and mounting posts 211 are rotatably connected to the clamping member 21. The mounting posts 211 are located in the mounting cavities 43, and a slide groove 44 is provided in the mounting cavities 43 along the length direction of the mounting cavities 43, and the mounting posts 211 are slidably installed in the slide groove 44. In some other embodiments, the mounting posts 211 can also be directly fixed. In this embodiment, by sliding the mounting posts 211 in the slide groove 44 and sliding the mounting posts 211 toward the inner side of the mounting cavities 43, the clamping member 21 can be stored in the mounting cavities 43. On the one hand, the clamping member 21 is prevented from damaging the inner wall of the oral cavity when the camera end 12 is extended into the oral cavity, and on the other hand, the clamping member 21 can be prevented from blocking the field of view of the camera end 12. It should be noted that in this embodiment, the upper and lower inner walls of the mounting cavity 43 are provided with slide grooves 44, and the upper and lower ends of the mounting posts 211 are respectively slidably installed in the two slide grooves 44, so as to improve the sliding stability of the mounting posts 211.

[0038] In this embodiment, the driving assembly 3 includes two driving members 31 with the same structure. A driving cavity 45 is provided on both sides of the shell 4. One end of the driving cavity 45 close to the display end 11 passes through the shell 4. One end of the driving member 31 is slidably arranged in the driving cavity 45, and the other end protrudes from the outside of the shell 4. The driving cavity 45 is connected with the installation cavity 43. A guide structure 22 is arranged on the clamping member 21. When the driving member 31 squeezes the guide structure 22, the clamping member 21 is forced to rotate in the direction close to the camera end 12. In some other embodiments, a driving motor can also be directly arranged, and the clamping member 21 can be driven to rotate by the driving motor. In this embodiment, by setting the driving member 31, when in use, the driving member 31 is pushed in the direction close to the clamping member 21 until the driving member 31 squeezes the guide structure 22, forcing the clamping member 21 to rotate in the direction close to the camera end 12, so that the two clamping members 21 rotate in opposite directions, and the catheter is clamped, which is simple and convenient to operate.

[0039] In this embodiment, a notch 311 is provided on the inner side of the driving member 31, and a driving head 32 is slidably connected at the notch 311. A first elastic member 33 is provided between the driving head 32 and the driving member 31, and the first elastic member 33 is a spring. The driving head 32 abuts against the end of the clamping member 21, and the driving head 32 is used to push the clamping member 21 out of the mounting cavity 43. When the driving member 31 moves toward the clamping member 21, the clamping member 21 is first pushed out of the mounting cavity 43 by the first elastic member 33 and the driving head 32, until the clamping member 21 moves to the maximum position, the driving member 31 continuously compresses the first elastic member 33, and squeezes the guide structure 22, forcing the clamping member 21 to rotate in the direction close to the camera end 12. There is no need to perform the operation of pushing the clamping member 21 out of the mounting cavity 43 separately, which reduces the difficulty of operation. The end of the driving head 32 of this embodiment is set to an arc shape to improve the stability of the contact between the driving head 32 and the clamping member 21. In this embodiment, a slide bar is fixedly provided on the driving head 32, a slide hole is provided in the slot 311, the slide bar is slidably inserted in the slide hole, the first elastic member 33 is sleeved on the slide bar, one end of the first elastic member 33 abuts against the inner wall of the slot 311, and the other end abuts against the end wall of the driving head 32, so as to improve the stability of the movement of the driving head 32.

[0040] In this embodiment, a connecting rope 34 is provided between the end of the driving member 31 and the clamping member 21. When the driving member 31 moves toward the display end 11, the driving member 31 drives the clamping member 21 to move toward the display end 11 through the connecting rope 34. When the driving member 31 moves toward the display end 11, the driving member 31 drives the clamping member 21 to move toward the display end 11 through the connecting rope 34, and automatically retracts the clamping member 21 into the installation cavity 43.

[0041] In this embodiment, the connecting rope 34 is an elastic rope, one end of which is fixedly connected to the end of the driving member 31, and the other end of which is fixedly connected to the guide structure 22. The first elastic member 33 and the driving head 32 push the clamping member 21 out of the installation cavity 43 until the clamping member 21 moves to the maximum position, and then the elastic rope causes the clamping member 21 to rotate in a direction away from the imaging end 12, thereby increasing the angle between the two clamping members 21 so as to clamp the catheter.

[0042] In this embodiment, a clamping head 23 is provided at one end of the clamping member 21 away from the driving member 31. When the two clamping members 21 rotate toward each other to the maximum position, the two clamping heads 23 are parallel. An accommodating groove 46 is provided at one end of the mounting cavity 43 away from the driving member 31. The accommodating groove 46 is used to receive the clamping head 23. When the two clamping members 21 rotate toward each other to the maximum position, the two clamping heads 23 are parallel, which increases the contact surface between the clamping member 21 and the catheter, and improves the clamping stability of the clamping member 21 on the catheter.

[0043] In this embodiment, the ends of the two driving members 31 away from the clamping member 21 are fixedly connected to the same push rod 35. Pushing the push rod 35 can simultaneously push the two driving members 31 to move, thereby improving the convenience of operation. A limit block 36 is provided at the end of the driving member 31 close to the push rod 35. A second elastic member 37 is provided between the limit block 36 and the housing 4. The limit block 36 is used to limit the maximum position of the driving member 31 moving toward the clamping member 21. The second elastic member 37 is used to automatically reset the driving member 31. Similarly, a slide bar is fixedly provided on the limit block 36. A slide hole is provided in the housing 4. The slide bar is slidably inserted into the slide hole. The second elastic member 37 is sleeved on the slide bar. One end of the second elastic member 37 abuts against the end wall of the slot housing 4, and the other end abuts against the end wall of the limit block 36 to prevent the second elastic member 37 from moving at will.

[0044] The working principle of the present invention is as follows: First, the camera end 12 of the laryngoscope body 1 is inserted into the housing 4 until the slot 41 of the housing 4 is engaged with the protrusion 14 of the laryngoscope body 1, and then the camera end 12 is extended to the patient's throat.

[0045] Then, the catheter is inserted into the oral cavity through the nasal cavity, and the position of the catheter is observed through the display terminal 11 until the catheter is located in front of the camera terminal 12 .

[0046] Then, the push rod 35 is pushed to push the two driving members 31 toward the camera end 12. When the driving member 31 moves toward the clamping member 21, the clamping member 21 is first pushed out of the installation cavity 43 through the first elastic member 33 and the driving head 32 until the clamping member 21 moves to the maximum position. Then, the elastic rope causes the clamping member 21 to rotate in the direction away from the camera end 12, thereby increasing the angle between the two clamping members 21.

[0047] Finally, continue to push the push rod 35, the driving member 31 continues to compress the first elastic member 33, and squeezes the guide structure 22, forcing the clamping member 21 to rotate toward the camera end 12, and the two clamping members 21 rotate towards each other to clamp the catheter, and then the laryngoscope body 1 and the catheter can be taken out.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A visual mouth-nose exchange device, characterized in that: The invention comprises a laryngoscope body (1) for observing the position of a catheter and a clamping mechanism, wherein the laryngoscope body (1) comprises a display end (11) and a camera end (12), and the clamping mechanism comprises a clamping assembly (2) and a driving assembly (3), wherein the clamping assembly (2) is mounted on the camera end (12), and the driving assembly (3) is in transmission connection with the clamping assembly (2), wherein the clamping assembly (2) is used for clamping the catheter, and the driving assembly (3) is used for driving the clamping assembly (2) to operate.

2. A visual mouth-nose exchange device according to claim 1, characterized in that: A housing (4) is detachably mounted on the camera end (12) of the laryngoscope body (1); the clamping assembly (2) and the driving assembly (3) are respectively mounted on two ends of the housing (4); the clamping assembly (2) is located at an end close to the camera end (12), and the driving assembly (3) is located at an end close to the display end (11).

3. A visual mouth-nose exchange device according to claim 2, characterized in that: The clamping assembly (2) comprises two clamping members (21) of identical structure, one end of the clamping member (21) being rotatably connected to the housing (4), and the other end being located outside the housing (4), the two clamping members (21) being respectively arranged on two sides of the housing (4), and the two clamping members (21) being transmission-connected to the driving assembly (3), and the driving assembly (3) being used to drive the two clamping members (21) to rotate towards each other for clamping.

4. A visual mouth-nose exchange device according to claim 3, characterized in that: Both sides of the shell (4) are provided with mounting cavities (43); the clamping member (21) is rotatably connected with a mounting column (211); the mounting column (211) is located in the mounting cavity (43); a slide groove (44) is provided in the mounting cavity (43) along the length direction of the mounting cavity (43); the mounting column (211) is slidably mounted in the slide groove (44).

5. A visual mouth-nose exchange device according to claim 4, characterized in that: The driving assembly (3) comprises two driving members (31) of the same structure. A driving cavity (45) is provided on both sides of the shell (4). One end of the driving cavity (45) close to the display end (11) passes through the shell (4). One end of the driving member (31) is slidably arranged in the driving cavity (45), and the other end protrudes out of the shell (4). The driving cavity (45) is communicated with the installation cavity (43). A guide structure (22) is provided on the clamping member (21). When the driving member (31) presses the guide structure (22), the clamping member (21) is forced to rotate in a direction close to the camera end (12).

6. A visual mouth-nose exchange device according to claim 5, characterized in that: The inner side surface of the driving member (31) is provided with a notch (311), and a driving head (32) is slidably connected to the notch (311). A first elastic member (33) is provided between the driving head (32) and the driving member (31). The driving head (32) abuts against the end of the clamping member (21). The driving head (32) is used to push the clamping member (21) out of the installation cavity (43). When the driving member (31) moves toward the clamping member (21), the driving head (32) is pushed to move by the first elastic member (33).

7. A visual mouth-nose exchange device according to claim 6, characterized in that: A connecting rope (34) is provided between the end of the driving member (31) and the clamping member (21); when the driving member (31) moves toward the display end (11), the driving member (31) drives the clamping member (21) to move toward the display end (11) via the connecting rope (34).

8. A visual mouth-nose exchange device according to claim 7, characterized in that: The connecting rope (34) is an elastic rope, one end of which is fixedly connected to the end of the driving member (31), and the other end of which is fixedly connected to the guide structure (22).

9. The visual mouth-nose exchange device according to claim 5, characterized in that: A clamping head (23) is provided at one end of the clamping member (21) away from the driving member (31); when the two clamping members (21) rotate towards each other to the maximum position, the two clamping heads (23) are parallel; and a receiving groove (46) is provided at one end of the installation cavity (43) away from the driving member (31); the receiving groove (46) is used to accommodate the clamping head (23).

10. The visual mouth-nose exchange device according to claim 5, characterized in that: One end of the two driving members (31) away from the clamping member (21) is fixedly connected to the same push rod (35); one end of the driving member (31) close to the push rod (35) is provided with a limit block (36); a second elastic member (37) is provided between the limit block (36) and the housing (4); the limit block (36) is used to limit the maximum position of the driving member (31) moving in the direction of the clamping member (21); and the second elastic member (37) is used to automatically reset the driving member (31).

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