Closure clip control instrument

Abstract

The invention discloses a closed clamp control instrument which comprises an elastic clamp and an operating rod, the elastic clamp is in a normally closed state, one end of the operating rod is hinged to a first clamp body and a second clamp body which are matched with the elastic clamp, and the first clamp body and the second clamp body are arranged oppositely; a sliding opening and closing module and an adjusting module are further arranged on the operating rod, and one end of the sliding opening and closing module is hinged to the first clamp body and the second clamp body in the axial direction of the operating rod; the adjusting module is in power connection with the sliding opening and closing module through a driving gear and a rack which are matched with each other; inserting connection of the elastic clamp, the first clamp body and the second clamp body is achieved in an inserting mode, so that repeated opening and closing control over the elastic clamp is achieved, the repeated adjusting requirement of medical staff is met, and the adjustability of the elastic clamp is improved as much as possible; and meanwhile, through the adjustment, the accuracy of the point position clamping and closing of the elastic clamp can be effectively improved, and therefore the reliability and accuracy of closing and clamping are improved.

Description

Technical Field

[0001] This application relates to the technical field of medical device equipment, and particularly relates to a closing clip control device. Background Art

[0002] In the prior art, titanium clips or other closing clips are often used to clamp and stop bleeding at the internal bleeding point. The above-mentioned closing clip mainly includes two parts: a clip body and an operating device. The clip body and the operating device are separable structures. After the clip body clamps and stops bleeding, it can be separated from the operating device.

[0003] Due to reasons such as limited vision during the operation, there may be a certain deviation between the clamping area of the medical staff and the actual bleeding area. At this time, it is necessary to open the clip body and adjust the clamping area. However, in the prior art, it is difficult to reconnect the clip body and the operating device after separation, and the clip body cannot be opened again, resulting in poor adjustability of the device. Summary of the Invention

[0004] The main purpose of this application is to provide a closing clip control device, aiming to solve the defect of poor adjustability existing in the prior art.

[0005] This application achieves the above object through the following technical solutions:

[0006] A closing clip control device includes:

[0007] An elastic clip, which is in a normally closed state;

[0008] An operating rod, one end of which is hinged with a first clip body and a second clip body adapted to the elastic clip, and the first clip body and the second clip body are arranged opposite to each other;

[0009] A sliding opening and closing module, which is slidably arranged in the operating rod. Along the axial direction of the operating rod, one end of the sliding opening and closing module is respectively hinged to the first clip body and the second clip body;

[0010] An adjusting module, which is rotatably arranged on the operating rod, and the adjusting module is power-connected to the sliding opening and closing module through a driving gear and a rack that cooperate with each other.

[0011] Optionally, the elastic clip includes a first clip piece, a U-shaped connecting piece and a second clip piece that are integrally connected in sequence. The first clip piece and the second clip piece are mutually attached; on the mutually facing sides of the first clip piece and the second clip piece, there are respectively arranged insertion sleeves adapted to the first clip body and the second clip body.

[0012] Optionally, the first clamping body and the second clamping body are arranged in an arc structure, one end of which is hinged to the operating rod, and clamping grooves are further provided at the free ends of the first clamping body and the second clamping body, and the two clamping grooves are respectively inserted and connected with the two plug sleeves.

[0013] Optionally, the operating rod includes a rod body, and an adjusting cavity for placing the sliding opening and closing module is provided on the rod body; a connecting block is provided at one end of the adjusting cavity, and an adjusting module for power-connecting with the sliding opening and closing module is provided at the other end; along the length direction of the connecting block, hinge shafts are provided at both ends of the connecting block, and the first clamping body and the second clamping body are respectively hinged to the two hinge shafts.

[0014] Optionally, a limiting step adapted to the rod body is provided on the connecting block; along the axis of the connecting block, one end of the connecting block is inserted into the adjusting cavity, and a plurality of limiting rings are further provided between the connecting block and the adjusting cavity; two hinge lugs are symmetrically provided at the other end of the connecting block, and the hinge shafts are respectively arranged on the two hinge lugs.

[0015] Optionally, the sliding opening and closing module includes a sliding rod and a plurality of support sleeves, and the support sleeves are sequentially arranged along the axis of the operating rod; the sliding rod is respectively slidably connected with the support sleeves.

[0016] Optionally, the sliding opening and closing module further includes an adjusting block, and driving rods are hinged at both ends of the adjusting block along the length direction of the adjusting block, and pin shafts are provided in the middle parts of the first clamping body and the second clamping body, and the two pin shafts are respectively hinged to the two driving rods.

[0017] Optionally, the adjusting module includes an adjusting rod, and a grip is further provided at one end of the rod body; the adjusting rod is rotatably arranged in the grip; a rack is further provided on the sliding rod, and a driving gear adapted to the driving rack is provided on the adjusting rod.

[0018] Optionally, a driving wheel for rotating the adjusting rod is further provided on the grip.

[0019] Optionally, an adjusting sleeve is further provided on the rod body, and a locking screw for fixing the sliding rod is connected by screw threads in the adjusting sleeve.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] This application includes an elastic clip and an operating rod. The elastic clip is in a normally closed state. One end of the operating rod is hinged with a first clip body and a second clip body that are adapted to the elastic clip. The first clip body and the second clip body are arranged opposite to each other. A sliding opening / closing module and an adjusting module are also provided on the operating rod. Along the axial direction of the operating rod, one end of the sliding opening / closing module is hinged to the first clip body and the second clip body respectively. The adjusting module is power-connected to the sliding opening / closing module through a mutually cooperating driving gear and a rack.

[0022] During use, the first clip body and the second clip body are controlled to open through the adjusting module and the sliding opening / closing module. Then, they are inserted and connected to the elastic clip. Further, the first clip body and the second clip body are opened to completely open the elastic clip.

[0023] When the elastic clip is placed at the position to be hemostatic, then reversely controlling the adjusting module can control the first clip body and the second clip body to approach each other. Under the action of its own elastic force, the elastic clip will automatically close to clamp the position to be hemostatic. Then, pulling out the operating rod can realize the separation from the elastic clip. If the medical staff believes that the clamping position is unreasonable, they can control the first clip body and the second clip body to open to a limited extent again, insert and connect them to the elastic clip, and control the elastic clip to open to realize secondary clamping.

[0024] Compared with the prior art, this application can realize multiple opening and closing controls of the elastic clip, thus meeting the multiple adjustment requirements of medical staff and improving the adjustability of the elastic clip as much as possible. At the same time, through the above adjustment, the accuracy of the clamping point of the elastic clip can be effectively improved, thereby improving the reliability and accuracy of the closing and clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a closing clip control device provided in Embodiment 1 of this application;

[0026] Figure 2 It is an exploded view of a closing clip control device provided in Embodiment 1 of this application;

[0027] Figure 3 It is Figure 2 The enlarged view of part A in

[0028] Figure 4 It is a front view of a closing clip control device provided in Embodiment 1 of this application;

[0029] Figure 5 It is Figure 4 The cross-sectional view along line B-B in

[0030] Figure 6 It is Figure 4Cross-sectional view along line C-C;

[0031] Figure 7 Structural schematic diagram of the elastic clip;

[0032] Figure 8 Structural schematic diagram of another alternative technical solution of the elastic clip;

[0033] Reference numerals: 1 - elastic clip, 2 - operating rod, 3 - first clip body, 4 - second clip body, 5 - driving gear, 6 - rack, 7 - card slot, 8 - connecting block, 9 - hinge shaft, 10 - limiting step, 11 - limiting ring, 12 - hinge ear plate, 13 - sliding rod, 14 - support sleeve, 15 - adjusting block, 16 - driving rod, 17 - pin shaft, 18 - adjusting rod, 19 - grip, 20 - driving wheel, 21 - adjusting sleeve, 22 - locking screw, 101 - first clip piece, 102 - U-shaped connecting piece, 103 - second clip piece, 104 - plugging sleeve, 105 - adjusting elastic piece, 106 - plugging rod, 201 - rod body, 202 - adjusting cavity, 301 - plugging gap.

[0034] The realization of the purpose, functional features and advantages of this application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0037] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "robot coordinate system and / or m" as an example, it includes the robot coordinate system scenario, or the m scenario, or the scenario where both the robot coordinate system and m are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] Embodiment 1

[0040] Referring to Figures 1 to 8 , as an optional embodiment of the present application, this embodiment discloses a closing clip control device, including an elastic clip 1 and an operating rod 2. The elastic clip 1 includes a first clip 101, a U-shaped connecting piece 102, and a second clip 103. The elastic clip 1 is integrally in a U-shaped structure. One end of the first clip 101 is integrally connected to one end of the U-shaped connecting piece 102, and the other end of the second clip 103 is integrally connected to the other end of the U-shaped connecting piece 102;

[0041] The first clip 101 and the second clip 103 are arranged opposite to each other and are in contact with each other;

[0042] Furthermore, plug holes are provided on both the first clip 101 and the second clip 103. The two plug holes are arranged opposite to each other. The elastic clip 1 further includes an adjusting spring piece 105. The adjusting spring piece 105 is in an arc structure. Plug rods 106 are provided at both ends of the adjusting spring piece 105. The two plug rods 106 are respectively inserted into the plug holes;

[0043] In the above structural design, the clamping force of the entire elastic clip 1 can be further improved through the adjusting spring piece 105 to ensure the clamping effect;

[0044] Secondly, the adjusting spring piece 105 and the elastic clip 1 are in a detachable connection structure, that is, the adjusting spring piece 105 can be installed or removed. The material of the adjusting spring piece 105 can also be changed to enable the elastic clip 1 to have different extrusion forces to meet the clamping requirements of different tissues, thereby avoiding tissue necrosis caused by excessive extrusion.

[0045] Moreover, the above device has a simple structure and is easy to use, effectively improving the adaptability of the device.

[0046] Further, on the side of the first clip 101 and the second clip 103 facing away from each other, insertion sleeves 104 are provided. The two insertion sleeves 104 are sheet-like structures with a U-shaped structure. The two ends of the insertion sleeve 104 are respectively connected to the first clip 101 or the second clip 103;

[0047] Further, the hemostatic device further includes an operating rod 2. The operating rod 2 includes a rod body 201. The rod body 201 is an overall hollow circular tube, and its cavity is an adjustment cavity 202. Both ends of the rod body 201 are open;

[0048] At one end of the rod body 201, a connecting block 8 is provided. The connecting block 8 is overall cylindrical. A limiting step 10 is provided in the middle of the connecting block 8, that is, the radial section of the connecting block 8 is a trapezoidal structure; along the axis of the connecting block 8, a plurality of annular grooves are provided at the small head end of the connecting block 8. Rubber limiting rings 11 are embedded in each of the annular grooves. During installation, the small head end of the connecting block 8 is inserted into the rod body 201. After being installed in place, the limiting step 10 on the connecting block 8 abuts against the end face of the rod body 201;

[0049] In the above technical solution, the limiting ring 11 can ensure the connection stability between the connecting block 8 and the rod body 201. At the same time, the limiting step 10 can effectively control the insertion depth of the connecting block 8, which is beneficial to ensuring the reliability of their connection;

[0050] At the large head end of the connecting block 8, two hinge ear plates 12 are provided. The two hinge ear plates 12 are symmetrically arranged on both sides of the connecting block 8, and the included angle between them is 180°; hinge shafts 9 are provided on both of the hinge ear plates 12;

[0051] The hemostatic device further includes a first clip body 3 and a second clip body 4. The structures of the first clip body 3 and the second clip body 4 are exactly the same, and both are arranged in an arc structure. One end of the first clip body 3 is rotatably connected to one of the hinge shafts 9, and one end of the second clip body 4 is rotatably connected to the other hinge shaft 9; the other ends of the first clip body 3 and the second clip body 4 are freely arranged;

[0052] During use, the first clip body 3 is inserted into one of the insertion sleeves 104, and the second clip body 4 is inserted into the other insertion sleeve 104. During the process of the first clip body 3 and the second clip body 4 opening relative to each other, the elastic clip 1 will be driven to open through the insertion sleeve 104, thereby simplifying the operation procedure;

[0053] On the other hand, the connection between the plug-in sleeve 104 and the first clamping body 3 and the second clamping body 4 is in a detachable state, and the disassembly and installation are convenient, so as to ensure that the elastic clip 1 can be separated from devices such as the operating rod 2 in time after being installed in place, and can be connected again when needed, ensuring the repeatability of the opening and closing operation of the elastic clip 1;

[0054] Finally, through the plug-in sleeve 104, the connection stability between the first clamping body 3 and the second clamping body 4 and the elastic clip 1 can be effectively ensured, avoiding the dropping of the elastic clip 1 during the operation process, and improving the connection stability and reliability.

[0055] Furthermore, the free ends of the first clamping body 3 and the second clamping body 4 are both inclined with clamping surfaces, and the two clamping surfaces are arranged in a V-shaped structure, and their inclination angles are the same as the inclination angle of the plug-in sleeve 104; a plug-in gap 301 is also provided between the first clamping body 3 and the second clamping body 4;

[0056] Since the elastic clip 1 is in a normally closed state, it is integrally in a conical structure. Through the setting of the plug-in gap 301, it can be ensured that the elastic clip 1 is inserted between the first clamping body 3 and the second clamping body 4 from the plug-in gap 301 without opening the first clamping body 3 and the second clamping body 4, and then the first clamping body 3 and the second clamping body 4 are inserted into the plug-in groove, which simplifies the operation difficulty of the elastic clip 1.

[0057] Secondly, during the process of separating the elastic clip 1, the setting of the plug-in gap 301 can prevent the elastic clip 1 from interfering with the first clamping body 3 or the second clamping body 4, avoiding loosening of the elastic clip 1 during the separation process, and ensuring the effect of clamping and stopping bleeding.

[0058] Furthermore, a sliding opening and closing module is also provided in the adjustment cavity 202. The sliding opening and closing module includes a sliding rod 13 and a plurality of support sleeves 14. Preferably, there are 1-2 support sleeves 14. One of the support sleeves 14 is arranged at the other opening end of the adjustment cavity 202 and is coaxially arranged with the connection block 8; a through hole is also provided on the connection block 8. One end of the sliding rod 13 passes through the through hole and is located between the first clamping body 3 and the second clamping body 4, and the other end is slidably connected to the support sleeve 14;

[0059] The remaining support sleeves 14 are arranged in sequence along the axial direction of the adjustment cavity 202 and are respectively slidably connected to the sliding rod 13;

[0060] The sliding opening and closing module further includes an adjusting block 15. The adjusting block 15 is disposed between the first clamping body 3 and the second clamping body 4. Along the length direction of the adjusting block 15, driving rods 16 are hinged at both ends of the adjusting block 15. Pin shafts 17 are disposed in the middle parts of the first clamping body 3 and the second clamping body 4. The other end of one of the driving rods 16 is hinged and connected to the pin shaft 17 in the middle part of the first clamping body 3, and one end of the other driving rod 16 is hinged and connected to the pin shaft 17 in the middle part of the second clamping body 4;

[0061] A threaded hole is further disposed in the middle part of the adjusting block 15. One end of the sliding rod 13 between the first clamping body 3 and the second clamping body 4 is in threaded connection with the threaded hole;

[0062] Furthermore, the hemostatic device further includes an adjusting module. The adjusting module includes an adjusting rod 18. A grip 19 is integrally connected to the rod body 201. The grip 19 is hollow. The adjusting rod 18 is rotatably disposed in the grip 19 through a rolling bearing;

[0063] An installation groove is further disposed on the bottom surface of the sliding rod 13. A rack 6 is embedded in the installation groove. A driving gear 5 is further disposed on the adjusting rod 18. The driving gear 5 meshes with the rack 6, so as to realize the power connection between the adjusting rod 18 and the sliding rod 13;

[0064] A rotating shaft is further disposed on the grip 19. A driving wheel 20 and a driving gear are further disposed on the rotating shaft. The driving gear meshes with the driving gear 5. An adjusting groove is disposed on the grip 19. A part of the wheel body of the driving wheel 20 passes through the adjusting groove and extends out;

[0065] In the above structure, the grip 19 makes the whole device have better gripability and improves the comfort of equipment operation; at the same time, when holding the hemostatic device, the thumb can synchronously rotate the driving wheel 20, so as to realize the operation of the whole equipment, and the equipment operation is convenient;

[0066] Secondly, the cooperation between the rack 6 and the driving gear 5 has good transmission performance. While ensuring the timely response of the first clamping body 3 and the second clamping body 4, the transmission accuracy can be ensured, and the accuracy of clamping control is improved;

[0067] Furthermore, an adjusting sleeve 21 is further disposed in the middle part of the rod body 201. The adjusting sleeve 21 is communicated with the adjusting chamber. A locking screw 22 is in threaded connection in the adjusting sleeve 21. The free end of the locking screw 22 abuts against the sliding rod 13;

[0068] During use, medical staff hold the rod body with their left hand. After the slide rod is adjusted in place, the locking screw can be conveniently rotated with the left thumb to lock the slide rod. On the one hand, it can ensure the stability of the position of the slide rod; on the other hand, the locking device can free the right hand of the doctor, reduce the operation difficulty and ensure that the elastic clip can be stably in the open state, which is convenient for the doctor to observe and adjust the position of the elastic clip in time, and is beneficial to achieving one-time clamping hemostasis.

[0069] When the device of the present application is in use, the elastic clip and the operating rod are in a separated state. When performing clamping hemostasis, the first clip body and the second clip body need to be inserted into the two plug-in slots respectively to install the elastic clip.

[0070] Subsequently, move the elastic clip to the position to be hemostatic. By rotating the driving hole, control the slide rod to slide towards the connecting block side, and then push the adjusting block to move. Then, through the adjusting block, push the two driving rods, and the two driving rods push the first clip body and the second clip body to separate from each other. The first clip body and the second clip body will drive the elastic clip to open during the opening process. At this time, lock the slide rod with the locking screw.

[0071] After the clamping area of the elastic clip contacts the tissue to be hemostatic, loosen the locking screw, and the elastic clip can be automatically closed under the action of its own elastic force. It should be noted that during the automatic closing process of the elastic clip, it is necessary to control the reverse rotation speed of the driving wheel to control the closing force of the elastic clip to avoid damaging human tissues. Subsequently, separate the elastic clip from the first clip body and the second clip body.

[0072] If medical staff think the clamping position is unreasonable, they can control the first clip body and the second clip body to open to a limited extent again, then insert and connect them with the elastic clip, and control the elastic clip to open to achieve secondary clamping.

[0073] Compared with the prior art, the present application can realize multiple opening and closing controls of the elastic clip, so as to meet the multiple adjustment requirements of medical staff and improve the adjustability of the elastic clip as much as possible. At the same time, through the above adjustment, the accuracy of the clamping point of the elastic clip can be effectively improved, so as to improve the reliability and accuracy of closing and clamping.

[0074] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A closing clamp control device, characterized in that: include, An elastic clip (1), wherein the elastic clip (1) is in a normally closed state; An operating rod (2), one end of which is hingedly connected with a first clamp body (3) and a second clamp body (4) adapted to the elastic clamp (1), and the first clamp body (3) and the second clamp body (4) are arranged opposite to each other; A sliding opening and closing module, wherein the sliding opening and closing module is slidably arranged in the operating rod (2), and along the axial direction of the operating rod (2), one end of the sliding opening and closing module is respectively hingedly connected to the first clamping body (3) and the second clamping body (4); An adjustment module is rotatably arranged on the operating rod (2), and the adjustment module is dynamically connected to the sliding opening and closing module through a driving gear (5) and a rack (6) that cooperate with each other.

2. A closing clip control device according to claim 1, characterized in that: The elastic clip (1) comprises a first clip (101), a U-shaped connecting piece (102) and a second clip (103) which are connected in sequence and are integrally connected, the first clip (101) and the second clip (103) being fitted to each other; and a plug-in sleeve (104) which is adapted to the first clip body (3) and the second clip body (4) is provided on a side of the first clip (101) and the second clip (103) which faces away from each other.

3. A closing clip control device according to claim 2, characterized in that: The first clamping body (3) and the second clamping body (4) are arranged in an arc-shaped structure, one end of which is hingedly connected to the operating rod (2), and the free ends of the first clamping body (3) and the second clamping body (4) are also provided with a card slot (7), and the two card slots (7) are respectively connected to the two plug sleeves (104) by plugging.

4. A closing clip control device according to claim 1, characterized in that: The operating rod (2) comprises a rod body (201), and an adjustment cavity (202) for placing a sliding opening and closing module is arranged on the rod body (201); a connecting block (8) is arranged at one end of the adjustment cavity (202), and an adjustment module dynamically connected to the sliding opening and closing module is arranged at the other end; along the length direction of the connecting block (8), both ends of the connecting block (8) are provided with hinge shafts (9), and the first clamp body (3) and the second clamp body (4) are respectively hingedly connected to the two hinge shafts (9).

5. A closing clip control device according to claim 4, characterized in that: The connecting block (8) is provided with a limiting step (10) adapted to the rod body (201); along the axis of the connecting block (8), one end of the connecting block (8) is inserted into the adjusting cavity (202), and a plurality of limiting rings (11) are provided between the connecting block (8) and the adjusting cavity (202); the other end of the connecting block (8) is symmetrically provided with two hinged ear plates (12), and the hinge shaft (9) is disposed on the two hinged ear plates (12).

6. A closing clip control device according to claim 4, characterized in that: The sliding opening and closing module comprises a sliding rod (13) and a plurality of supporting sleeves (14), and the supporting sleeves (14) are arranged in sequence along the axis of the operating rod (2); the sliding rod (13) is slidably connected to each supporting sleeve (14).

7. A closing clip control device according to claim 6, characterized in that: The sliding opening and closing module also includes an adjusting block (15), and along the length direction of the adjusting block (15), both ends of the adjusting block (15) are hinged with driving rods (16), and the middle parts of the first clamping body (3) and the second clamping body (4) are both provided with pin shafts (17), and the two pin shafts (17) are respectively hinged with the two driving rods (16).

8. A closing clip control device according to claim 6, characterized in that: The adjustment module comprises an adjustment rod (18), one end of the rod body (201) is also provided with a handle (19), and the adjustment rod (18) is rotatably arranged in the handle (19); the sliding rod (13) is also provided with a rack (6), and the adjustment rod (18) is provided with a driving gear (5) adapted to the driving rack (6).

9. A closing clip control device according to claim 8, characterized in that: The handle (19) is also provided with a driving wheel (20) for rotating the adjusting rod (18).

10. A closing clip control device according to claim 6, characterized in that: The rod body (201) is also provided with an adjusting sleeve (21), and a locking screw (22) for fixing the sliding rod (13) is connected to the adjusting sleeve (21) through a threaded connection.

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