Disposable puncture guide device

Abstract

The utility model provides a disposable puncture introducer, which relates to the technical field of medical instruments and comprises a handle component, an introducer component, a puncture crochet hook component and a puncture limit ring, the handle component comprises a handle body, a first line pressing screw is arranged at the rear end of the handle body, and the introducer component comprises an introducer support rod and a guide puncture outfit. One end of the guide device supporting rod is connected with the front end of the handle body, the other end of the guide device supporting rod is connected with the guide puncture device, a guide puncture head, a threading hole and a thread hooking groove are arranged at the front end of the guide puncture device, the puncture limiting ring is installed on the guide puncture device, and the puncture hooked needle assembly comprises a sliding rod which is arranged on the handle body in a front-back sliding mode. The front end of the sliding rod is provided with a puncture hook needle. According to the utility model, the puncture limiting ring is arranged on the guide puncture outfit, and when the guide puncture head punctures tissues, the puncture limiting ring can limit the puncture depth of the guide puncture outfit, so that the puncture depth is controllable, and the safety and the reliability in the puncture process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a disposable puncture introducer. Background Art

[0002] Puncture guides are primarily used in gynecological pelvic floor prolapse repair surgeries, particularly when guiding non-absorbable sutures through critical structures such as the sacrospinous ligament. Using a puncture guide allows surgeons to perform surgical procedures more accurately, improving both the success rate and the patient's postoperative recovery.

[0003] For example, the Chinese patent with authorization announcement number CN217162239U discloses a pelvic floor puncture guide, which belongs to the field of surgical instruments. The pelvic floor puncture guide of the utility model includes a handle, a puncture device, a thread hook and a locking screw. The puncture device includes a puncture rod and a puncture hook. The thread hook includes a sliding rod, a thread hook puncture head and a push-pull block. The front end of the puncture hook is provided with a puncture hook head, and one side of the puncture hook head is provided with a through groove. There is a threading hole at the top and bottom of the through groove. The thread hook puncture head is provided with a thread hook groove, and a notch is provided at the thread hook groove. The tail of the puncture rod or handle is provided with a positioning protrusion, and the tail of the sliding rod is provided with a positioning groove. The utility model makes the puncture and thread hooking operations more flexible and convenient by providing a positioning mechanism between the puncture device and the thread hook, which can effectively reduce the situation of thread derailment and improve the safety and reliability of surgical operations. In addition, the handle is injection molded, which is convenient for ergonomic design, making the pelvic floor puncture guide lighter and more comfortable and convenient to operate.

[0004] In the above scheme, the tissue can be punctured by the puncture hook head, but the puncture depth cannot be controlled during the puncture process. Excessive puncture may easily cause harm to the patient, and the safety is low. Utility Model Content

[0005] The utility model provides a disposable puncture introducer to solve the technical problems that the current puncture hook head cannot control the puncture depth during the puncture process, puncturing too deep may easily cause harm to the patient, and the safety is low.

[0006] In order to solve the above technical problems, the utility model discloses a disposable puncture guide, including: a handle assembly, a guide assembly, a puncture hook needle assembly and a puncture limiting ring. The handle assembly includes a handle body, and a first pressure screw is provided at the rear end of the handle body. The guide assembly includes a guide support rod and a guide puncture device. One end of the guide support rod is connected to the front end of the handle body, and the other end of the guide support rod is connected to the guide puncture device. A guide puncture head, a threading hole and a hook groove are provided at the front end of the guide puncture device. The puncture limiting ring is installed on the guide puncture device. The puncture hook needle assembly includes a sliding rod, which is arranged on the handle body for sliding back and forth. A puncture hook needle head is provided at the front end of the sliding rod, and an oblique groove is provided on the side wall of the sliding rod.

[0007] Preferably, a semi-automatic wire-pressing mechanism is provided at the front end of the handle body, and the semi-automatic wire-pressing mechanism includes: a second wire-pressing screw, a spring and a positioning column. The second wire-pressing screw and the positioning column are respectively provided on both sides of the handle body. A connecting hole is provided in the handle body, and a threaded hole is provided in the positioning column. One end of the second wire-pressing screw passes through the connecting hole and is threadedly connected to the threaded hole. The spring is sleeved on the outside of the second wire-pressing screw, one end of the spring is connected to the positioning column, and the other end of the spring is connected to the outer wall of the handle body.

[0008] Preferably, a plurality of hollow holes are provided in the handle body.

[0009] Preferably, a first mounting hole is provided at the front end of the handle body, a second mounting hole is provided in the guide puncture device, one end of the guide support rod is installed in the first mounting hole, and the other end of the guide support rod is installed in the second mounting hole.

[0010] Preferably, a through slot is provided at the upper end of the handle body, and the sliding rod is slidably installed in the through slot.

[0011] Preferably, a third mounting hole is provided in the guide puncture device, and the puncture hook needle head passes through the third mounting hole and the hook wire groove in sequence.

[0012] Preferably, a plurality of push-pull columns are provided on the sliding rod.

[0013] Preferably, the push-pull column is hexagonal in design.

[0014] Preferably, a through hole is provided in the center of the push-pull column.

[0015] Preferably, a guide limiting ring is provided between the handle body and the guide puncture device, a fourth mounting hole and a sliding hole are provided in the guide limiting ring, the guide limiting ring is installed on the guide support rod through the fourth mounting hole, the fourth mounting hole is interference fit with the outer wall of the guide support rod, the sliding rod passes through the sliding hole and is connected to the inner wall of the sliding hole in a forward and backward sliding manner.

[0016] The technical solution of the present invention has the following advantages: The present invention provides a disposable puncture guide, which relates to the technical field of medical devices and includes a handle assembly, an introducer assembly, a puncture hook needle assembly, and a puncture limiting ring. The handle assembly includes a handle body, a first pressure screw is provided at the rear end of the handle body, the introducer assembly includes a guide support rod and a guide puncture device, one end of the guide support rod is connected to the front end of the handle body, the other end of the guide support rod is connected to the guide puncture device, the front end of the guide puncture device is provided with a guide puncture head, a threading hole, and a thread hook groove, the puncture limiting ring is installed on the guide puncture device, the puncture hook needle assembly includes a sliding rod, the sliding rod is slidable back and forth on the handle body, the front end of the sliding rod is provided with a puncture hook needle head, and the side wall of the sliding rod is provided with an oblique groove. In the present invention, the puncture limiting ring is provided on the guide puncture device. When the guide puncture head punctures tissue, the puncture limiting ring can limit the puncture depth of the guide puncture device, making the puncture depth controllable and improving the safety and reliability of the puncture process.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained by the devices particularly pointed out in the written description and the drawings.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the disposable puncture introducer of the present utility model;

[0021] Figure 2 This is a top view of the partial structure of the guide puncture device and the puncture hook needle head in the utility model;

[0022] Figure 3 This is a top view of the semi-automatic wire pressing mechanism in the utility model.

[0023] In the picture:

[0024] 1. Handle assembly; 1-1. Handle body; 1-2. Second pressure screw; 1-3. Spring; 1-4. Positioning column; 1-5. First pressure screw; 1-6. Hollow hole; 1-7. First mounting hole; 1-8. Through slot;

[0025] 2. Introducer assembly; 2-1. Guide puncture device; 2-2. Second mounting hole; 2-3. Third mounting hole; 2-4. Threading hole; 2-5. Threading slot; 2-6. Guide puncture head; 2-7. Introducer support rod; 2-8. Guide limiting ring; 2-9. Fourth mounting hole; 2-10. Sliding hole;

[0026] 3. Puncture hook needle assembly; 3-1. Bevel groove; 3-2. Puncture hook needle head; 3-3. Sliding rod; 3-4. Push-pull column; 3-5. Through hole;

[0027] 4. Puncture limit ring. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0029] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] Example 1

[0031] The present invention provides a disposable puncture guide. Figure 1-Figure 3 As shown, it includes: a handle assembly 1, an introducer assembly 2, a puncture hook needle assembly 3 and a puncture limiting ring 4. The handle assembly 1 includes a handle body 1-1, and a first pressure screw 1-5 is set at the rear end of the handle body 1-1. The guide assembly 2 includes a guide support rod 2-7 and a guide puncture device 2-1. One end of the guide support rod 2-7 is connected to the front end of the handle body 1-1, and the other end of the guide support rod 2-7 is connected to the guide puncture device 2-1. The front end of the guide puncture device 2-1 is provided with a guide puncture head 2-6, a threading hole 2-4 and a hook groove 2-5. The puncture limiting ring 4 is installed on the guide puncture device 2-1. The puncture hook needle assembly 3 includes a sliding rod 3-3, which is set on the handle body 1-1 for sliding back and forth. The front end of the sliding rod 3-3 is provided with a puncture hook needle head 3-2, and the side wall of the sliding rod 3-3 is provided with an oblique groove 3-1.

[0032] The working principle and beneficial effects of the above technical solution are as follows: when in use, first pass the suture through the threading hole 2-4, which is provided with two threads, and the two threading holes 2-4 are distributed on the upper and lower sides of the hook groove 2-5. After the two ends of the suture are passed through the threading holes 2-4, they are respectively passed between the first thread-pressing screw 1-5 and the handle body 1-1. The suture can be tightened by the first thread-pressing screw 1-5, and then the handle body 1-1 is held, and the puncture head 2-6 is used to puncture the tissue to be sutured, and then the sliding rod 3-3 is pushed through the puncture hook. The needle 3-2 punctures the tissue to be sutured and inserts the suture thread into the oblique groove 3-1. Finally, the sliding rod 3-3 is pulled back, and the sliding rod 3-3 drives the puncture hook needle head 3-2 to move toward the handle body 1-1 and pulls the suture thread from the opposite side of the tissue to be sutured, thereby completing the suturing process. Among them, the handle assembly 1, the guide assembly 2 and the puncture hook needle assembly 3 are made of stainless steel, so that the puncture force of the guide puncture head 2-6 and the puncture hook needle head 3-2 is better, the overall strength is improved, and it is not easy to bend during use, which improves reliability. The guide puncture device 2-1 adopts an arc-shaped body design, which can be displaced with a suture to bypass the sacrospinous ligament. The guide puncture head 2-6 is a "duckbill-shaped" puncture structure, which is easier to achieve the puncture function. When the guide puncture head 2-6 punctures the tissue, a puncture limiting ring 4 is set on the guide puncture device 2-1. The puncture limiting ring 4 can limit the puncture depth of the guide puncture device 2-1, making the puncture depth controllable, avoiding excessive puncture and causing harm to the patient, and improving the safety and reliability of the puncture process. A top screw hole is set in the puncture limiting ring 4, and the top screw hole is provided. A top screw is provided, and the top screw contacts the outer wall of the guide puncture device 2-1, so that the position of the puncture limit ring 4 can be fixed. By loosening the top screw and separating the top screw from the guide puncture device 2-1, the puncture limit ring 4 can be slid on the arc section of the guide puncture device 2-1, thereby adjusting the position of the puncture limit ring 4. After the adjustment is completed, the top screw is tightened again to prevent the puncture limit ring 4 from moving. The position of the puncture limit ring 4 on the guide puncture device 2-1 is adjustable, so that the puncture depth of the guide puncture device 2-1 can be controlled, which can meet the needs of different patients and is safer and more reliable.

[0033] Example 2

[0034] On the basis of the above embodiment 1, Figure 1 、 Figure 3As shown, a semi-automatic wire-pressing mechanism is provided at the front end of the handle body 1-1, and the semi-automatic wire-pressing mechanism includes: a second wire-pressing screw 1-2, a spring 1-3 and a positioning column 1-4. The second wire-pressing screw 1-2 and the positioning column 1-4 are respectively provided on both sides of the handle body 1-1, a connecting hole is provided in the handle body 1-1, and a threaded hole is provided in the positioning column 1-4. One end of the second wire-pressing screw 1-2 passes through the connecting hole and is threadedly connected to the threaded hole. The spring 1-3 is sleeved on the outside of the second wire-pressing screw 1-2, one end of the spring 1-3 is connected to the positioning column 1-4, and the other end of the spring 1-3 is connected to the outer wall of the handle body 1-1.

[0035] The working principle and beneficial effects of the above technical solution are as follows: the suture can also be tightened by a semi-automatic thread pressing mechanism, which includes a second thread pressing screw 1-2, a spring 1-3 and a positioning column 1-4. The second thread pressing screw 1-2 is threadedly connected to the positioning column 1-4. Under the action of the spring 1-3, the inner side of the second thread pressing screw 1-2 presses the outer wall of the handle body 1-1. The connecting hole can be set as a stepped hole. A gap is set between the positioning column 1-4 and the step surface of the connecting hole to ensure that the positioning column 1-4 can slide in the connecting hole. When in use, after the suture is passed through the threading hole 2-4, the positioning column 1-4 is pressed down to tighten the second thread pressing screw 1-2 and the handle body 1 -1, a gap is exposed between the two ends of the suture, the suture is passed through the gap, and the positioning column 1-4 is loosened. Under the elastic force of the spring 1-3, the second pressure screw 1-2 can quickly compress the suture, and the suture can be loosened by pressing the positioning column 1-4 again, making the compression and loosening operations of the suture simpler and more convenient, especially during surgery, the pressure release function can be achieved with one hand, and the distance between the positioning column 1-4 and the end of the second pressure screw 1-2 can be adjusted by rotating the positioning column 1-4 or the second pressure screw 1-2, thereby adjusting the compression degree of the spring 1-3 and changing the pressure of the second pressure screw 1-2 on the suture to meet the needs of users to change the pressure force.

[0036] Example 3

[0037] On the basis of Example 1 or 2, as Figure 1 As shown, a plurality of hollow holes 1-6 are provided in the handle body 1-1.

[0038] The working principle and beneficial effects of the above technical solution are as follows: a plurality of hollow holes 1-6 are provided in the handle body 1-1, which can reduce the overall weight of the handle body 1-1, facilitate the user's grip, and make it more beautiful.

[0039] Example 4

[0040] On the basis of any one of Examples 1-3, Figure 1As shown, a first mounting hole 1-7 is provided at the front end of the handle body 1-1, a second mounting hole 2-2 is provided in the guide puncture device 2-1, one end of the guide support rod 2-7 is installed in the first mounting hole 1-7, and the other end of the guide support rod 2-7 is installed in the second mounting hole 2-2

[0041] The working principle and beneficial effects of the above technical solution are as follows: one end of the guide support rod 2-7 is fixedly connected to the inner wall of the first mounting hole 1-7, and the other end is fixedly connected to the inner wall of the second mounting hole 2-2, so that the installation of the guide support rod 2-7 is more stable, and no external welding or bonding is required, thereby improving the reliability of the connection.

[0042] Example 5

[0043] On the basis of any one of Examples 1-4, Figure 1 As shown, a through slot 1-8 is provided at the upper end of the handle body 1-1, and the sliding rod 3-3 is slidably installed in the through slot 1-8.

[0044] The working principle and beneficial effects of the above technical solution are as follows: the sliding rod 3-3 is slidably arranged in the through groove 1-8, and the rear end of the sliding rod 3-3 can slide back and forth in the through groove 1-8. The through groove 1-8 provides a guide for the sliding of the sliding rod 3-3, so that the sliding direction of the sliding rod 3-3 is stable, ensuring that the puncture hook needle head 3-2 can stably pass through the hook groove 2-5.

[0045] Example 6

[0046] On the basis of any one of Examples 1-5, Figure 1 As shown, a third mounting hole 2-3 is provided in the guide puncture device 2-1, and the puncture hook needle head 3-2 passes through the third mounting hole 2-3 and the hook wire groove 2-5 in sequence.

[0047] The working principle and beneficial effects of the above technical solution are as follows: the outer wall of the sliding rod 3-3 is slidably connected to the inner wall of the third mounting hole 2-3, and the sliding front end of the sliding rod 3-3 is guided by the third mounting hole 2-3, making the sliding process of the sliding rod 3-3 more stable and reliable.

[0048] Example 7

[0049] On the basis of any one of Examples 1-6, Figure 1 As shown, a plurality of push-pull columns 3-4 are provided on the sliding rod 3-3;

[0050] Push-pull columns 3-4 are hexagonal in design;

[0051] A through hole 3-5 is provided at the center of the push-pull column 3-4.

[0052] The working principle and beneficial effects of the above technical solution are as follows: the user can push and pull the sliding rod 3-3 through the push-pull column 3-4, making the pushing and pulling of the sliding rod 3-3 more convenient. The push-pull column 3-4 is hexagonal in design, which can increase the contact area and is not easy to slip during the pushing and pulling process; the push-pull column 3-4 has a hollow design with a through hole 3-5, which can reduce the overall weight and is more beautiful.

[0053] Example 8

[0054] On the basis of Example 7, Figure 1 As shown, a guide limiting ring 2-8 is provided between the handle body 1-1 and the guide puncture device 2-1, a fourth mounting hole 2-9 and a sliding hole 2-10 are provided in the guide limiting ring 2-8, the guide limiting ring 2-8 is installed on the guide support rod 2-7 through the fourth mounting hole 2-9, the fourth mounting hole 2-9 is interference fit with the outer wall of the guide support rod 2-7, and the sliding rod 3-3 passes through the sliding hole 2-10 and is connected to the inner wall of the sliding hole 2-10 for sliding back and forth.

[0055] The working principle and beneficial effects of the above technical solution are as follows: a guide limiting ring 2-8 is set between the handle body 1-1 and the guide puncture device 2-1, wherein the center lines of the fourth mounting hole 2-9, the first mounting hole 1-7 and the second mounting hole 2-2 are on the same straight line, the center lines of the sliding hole 2-10, the fourth mounting hole 2-9 and the through groove 1-8 are on the same straight line, and the sliding rod 3-3 can slide in the through groove 1-8, the sliding hole 2-10 and the fourth mounting hole 2-9. 2-10, under the joint guiding action of the fourth mounting hole 2-9 and the through groove 1-8, the oblique groove 3-1 on the sliding rod 3-3 is accurately guided into the hook groove 2-5 on the guide puncture device 2-1, so that the suture thread is hooked into the oblique groove 3-1. When installing the guide limiting ring 2-8, the guide limiting ring 2-8 can be adjusted and installed in the preset position according to the puncture depth of the puncture hook needle head 3-2, so as to avoid the puncture hook needle head 3-2 from puncturing too deep and causing harm to the patient, thereby improving safety.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0058] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A disposable puncture introducer, characterized in that: include: The invention relates to a handle assembly (1), an introducer assembly (2), a puncture hook needle assembly (3) and a puncture limiting ring (4). The handle assembly (1) includes a handle body (1-1). A first pressure screw (1-5) is provided at the rear end of the handle body (1-1). The introducer assembly (2) includes an introducer support rod (2-7) and a guide puncture device (2-1). One end of the introducer support rod (2-7) is connected to the front end of the handle body (1-1). The other end of the introducer support rod (2-7) is connected to the guide puncture device (2-1). The guide puncture device (2-1) is connected to the handle body (1-1), the front end of the guide puncture device (2-1) is provided with a guide puncture head (2-6), a threading hole (2-4) and a thread hook groove (2-5), the puncture limiting ring (4) is installed on the guide puncture device (2-1), and the puncture hook needle assembly (3) includes a sliding rod (3-3), the sliding rod (3-3) is slidably arranged on the handle body (1-1) in a forward and backward manner, the front end of the sliding rod (3-3) is provided with a puncture hook needle head (3-2), and the side wall of the sliding rod (3-3) is provided with an oblique groove (3-1).

2. The disposable puncture introducer according to claim 1, characterized in that: A semi-automatic wire pressing mechanism is provided at the front end of the handle body (1-1), and the semi-automatic wire pressing mechanism comprises: a second wire pressing screw (1-2), a spring (1-3) and a positioning column (1-4); the second wire pressing screw (1-2) and the positioning column (1-4) are respectively provided on both sides of the handle body (1-1); a connecting hole is provided in the handle body (1-1); a threaded hole is provided in the positioning column (1-4); one end of the second wire pressing screw (1-2) passes through the connecting hole and is threadedly connected to the threaded hole; the spring (1-3) is sleeved on the outside of the second wire pressing screw (1-2); one end of the spring (1-3) is connected to the positioning column (1-4); and the other end of the spring (1-3) is connected to the outer wall of the handle body (1-1).

3. The disposable puncture introducer according to claim 1, characterized in that: A plurality of hollow holes (1-6) are provided in the handle body (1-1).

4. The disposable puncture introducer according to claim 1, characterized in that: A first mounting hole (1-7) is provided at the front end of the handle body (1-1), a second mounting hole (2-2) is provided in the guide puncture device (2-1), one end of the guide support rod (2-7) is installed in the first mounting hole (1-7), and the other end of the guide support rod (2-7) is installed in the second mounting hole (2-2).

5. The disposable puncture introducer according to claim 1, characterized in that: A through slot (1-8) is provided at the upper end of the handle body (1-1), and the sliding rod (3-3) is slidably installed in the through slot (1-8).

6. The disposable puncture introducer according to claim 1, characterized in that: A third mounting hole (2-3) is provided in the guide puncture device (2-1), and the puncture hook needle head (3-2) passes through the third mounting hole (2-3) and the hook wire groove (2-5) in sequence.

7. The disposable puncture introducer according to claim 1, characterized in that: A plurality of push-pull columns (3-4) are arranged on the sliding rod (3-3).

8. The disposable puncture introducer according to claim 7, characterized in that: The push-pull columns (3-4) are designed in a hexagonal shape.

9. The disposable puncture introducer according to claim 7, characterized in that: A through hole (3-5) is provided at the center of the push-pull column (3-4).

10. The disposable puncture introducer according to claim 7, characterized in that: A guide limiting ring (2-8) is provided between the handle body (1-1) and the guide puncture device (2-1); a fourth mounting hole (2-9) and a sliding hole (2-10) are provided in the guide limiting ring (2-8); the guide limiting ring (2-8) is installed on the guide support rod (2-7) through the fourth mounting hole (2-9); the fourth mounting hole (2-9) is interference-fitted with the outer wall of the guide support rod (2-7); the sliding rod (3-3) passes through the sliding hole (2-10) and is connected to the inner wall of the sliding hole (2-10) by sliding back and forth.

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