Guide sleeve

Abstract

The invention belongs to the technical field of medical apparatus and instruments, and particularly relates to a guide sleeve which mainly comprises a handle, a first connecting part and a second connecting part, the guide sleeve is connected with the first connecting part and can rotate relative to the first connecting part; the connecting support arm is provided with a second connecting part, and the connecting support arm is connected with the guide sleeve through the second connecting part and synchronously rotates along with the guide sleeve; in the length extension direction of the guide sleeve, a first position and a second position are arranged between the second connecting part and the first connecting part, under the first position, the first connecting part and the second connecting part are connected to enable the guide sleeve to be locked, and under the second position, the first connecting part and the second connecting part are connected to enable the guide sleeve to be locked. The first connecting part and the second connecting part are far away from each other in the length extension direction of the guide sleeve, so that the first connecting part and the second connecting part are separated, and the guide sleeve is allowed to drive the connecting support arm to rotate relative to the first connecting part.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and specifically relates to a guide sleeve. Background Art

[0002] Surgical navigation is a computer-assisted technology that uses three-dimensional imaging information as a guide to help doctors determine anatomical structures during surgery. The navigation system can provide the positional relationship between the patient's anatomical structure and surgical instruments, plan the surgical path in advance, and guide doctors to avoid important tissue structures such as important nerves and blood vessels.

[0003] In the intertrochanteric fracture internal fixation surgery (PFNA), because intertrochanteric surgery involves many types of instruments and the intertrochanteric surgical environment is relatively complex, if the outer sleeve is matched one by one with the operating reference frame, a lot of instruments will be set up; therefore, it is thought of reducing the individual needs of instruments through adjustable methods. The most critical instruments used in intertrochanteric surgery include guide sleeve instruments. Most sleeve instruments are tubular. To facilitate the doctor's operation, a handle is set on the outside of the sleeve instrument. The sleeve instrument also needs an external reference frame when in use, for example, a reference frame with an NDI optical ball, so that the sleeve instrument can be recognized by the navigation system. During the operation, the patient's position on the operating table remains unchanged, and the position between the navigation system's identification probe and the patient is also unchanged. Therefore, during the preparation for the operation, the reference frame needs to be adjusted in direction according to the position of the patient's affected side and the position of the navigation system's identification probe.

[0004] At present, fasteners such as bolts are commonly used to limit the reference frame to the outside of the sleeve instrument. Special tools are needed to adjust the state of the fasteners to release the positional relationship between the reference frame and the sleeve instrument, and then adjust the spatial position of the reference frame to correspond to the identification probe of the navigation system. Finally, special tools are used to adjust the state of the fasteners to limit the positional relationship between the reference frame and the sleeve instrument again. It can be seen that the entire adjustment process is relatively cumbersome and takes a long time; and special tools unrelated to the operation need to be used, which increases the chance of infection.

[0005] In view of the above problems, the present invention provides a guide sleeve. Summary of the invention

[0006] In order to overcome the problems raised in the background technology, the present invention adopts the following technical solution: a guide sleeve, comprising:

[0007] A handle having a first connecting portion;

[0008] a guide sleeve connected to the first connecting portion and capable of rotating relative to the first connecting portion;

[0009] A connecting arm having a second connecting portion, wherein the connecting arm is connected to the guide sleeve via the second connecting portion and rotates synchronously with the guide sleeve;

[0010] Wherein, in the length extension direction of the guide sleeve, there is a first position and a second position between the second connection part and the first connection part. In the first position, the first connection part is engaged with the second connection part, so that the guide sleeve is locked. In the second position, the first connection part and the second connection part are away from each other in the length extension direction of the guide sleeve, so that the first connection part is separated from the second connection part to allow the guide sleeve to drive the connecting arm to rotate relative to the first connection part.

[0011] In some embodiments of the present application, the guide sleeve comprises:

[0012] a sleeve body rotatably connected to the first connecting portion, wherein the sleeve body can move relative to the first connecting portion in a length direction thereof;

[0013] a blocking member, disposed at one end of the sleeve body and partially extending into the first connecting portion, wherein the blocking member moves synchronously with the sleeve body to approach the first connecting portion and move away from the first connecting portion when the sleeve body moves;

[0014] The second connection portion is fixedly connected to the sleeve body and moves synchronously with the sleeve body, wherein the second connection portion is located below the first connection portion in the length extension direction of the sleeve body.

[0015] Further, the first connecting portion has a receiving cavity, the sleeve body passes through the receiving cavity, and the blocking member is partially located in the receiving cavity;

[0016] Wherein, it also includes: a spring, which is arranged around the outer wall of the sleeve body and located in the accommodating cavity, one end of the elastic member abuts against the bottom surface of the blocking member, and the other end of the spring abuts against the bottom of the accommodating cavity, when the first connection part and the second connection part move from the first position to the second position, the blocking member approaches the direction of the first connection part, so that the spring is compressed, and the second connection part moves away from the first connection part with the movement of the sleeve body, and when the first connection part and the second connection part move from the second position to the first position, the spring expands to drive the blocking member to move in the direction away from the first connection part, and the second connection part engages with the first connection part with the movement of the sleeve body.

[0017] Furthermore, the diameter of the accommodating cavity is the same as the outer diameter of the blocking member, wherein the outer diameter of the blocking member is larger than the outer diameter of the sleeve body.

[0018] Further, the first connection portion has a first joint end surface, wherein the first joint end surface is provided with a connection axis extending toward the second connection portion;

[0019] The second connecting portion has a second connecting end surface, wherein the second connecting surface is provided with a plurality of connecting channels in a direction away from the first connecting portion;

[0020] Among them, in the first position, the connecting shaft extends into one of the connecting channels, and the first joining end face and the second joining end face are always in contact under the action of the spring. In the second position, the first joining end face and the second joining end face are separated, and the connecting shaft is removed from the connecting channel to allow the sleeve body to rotate axially relative to the first connecting part.

[0021] Furthermore, a plurality of connecting shafts are provided, and the number of the connecting shafts is the same as the number of the connecting holes.

[0022] Further, the first connecting portion has a first axis, wherein a plurality of connecting shafts are circumferentially distributed on the first joint end surface around the first axis, and a plurality of connecting channels are circumferentially distributed on the second joint end surface around the first axis.

[0023] Furthermore, the spacings between adjacent connecting shafts are the same, and the spacings between adjacent connecting channels are the same.

[0024] In some embodiments of the present application, it further includes: a tube core, one end of which passes through the blocking member and the sleeve body, wherein the tube core is detachably connected to the blocking member.

[0025] Furthermore, the blocking member has a threaded hole, and the outer wall of the barrel core is provided with a threaded section, wherein the threaded section is engaged with the threaded hole, thereby forming a connection relationship between the barrel core and the blocking member.

[0026] Beneficial effects of the present invention:

[0027] 1. By setting a guide sleeve, a first connection part and a second connection part, when in use, by applying force to the blocking member and the sleeve body, the sleeve body is moved relative to the first connection part, thereby making the first connection part and the second connection part move from the first position to the second position, thereby making the sleeve body rotate and driving the reference frame to rotate, thereby adjusting the direction of the reference frame, and after stopping applying force to the blocking member, the first connection part and the second connection part can be reset to the first position under the action of the spring, thereby completing the locking of the sleeve body. Compared with the traditional method of repeatedly loosening and tightening the fasteners using special tools for adjustment, the adjustment steps and time are saved, the use of other instruments is reduced, and the probability of infection of patients is reduced.

[0028] 2. By setting a handle, when in use, the operator can apply force to the blocking member and the sleeve body only when holding the handle, so that it moves relative to the first connecting part, and then it can also achieve a self-locking effect, which avoids the reference frame from being shifted due to accidentally touching the reference frame or touching the blocking member during the operation.

[0029] 3. By setting a spring, the first connecting part and the second connecting part are always kept engaged at the first position, thereby fixing the sleeve body and preventing the sleeve body and the reference frame from rotating. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the positional relationship between the first connecting portion and the second connecting portion of the present invention;

[0032] Figure 3 It is a schematic structural diagram of the first connecting part and the second connecting part of the present invention in the first position;

[0033] Figure 4 It is a schematic structural diagram of the first connecting part and the second connecting part of the present invention in the second position;

[0034] Figure 5 It is a schematic diagram of the first joint end surface structure of the present invention;

[0035] Figure 6 It is a schematic diagram of the second joint end surface structure of the present invention;

[0036] Figure 7 It is a schematic cross-sectional view of the sleeve body of the present invention;

[0037] Figure 8 It is a cross-sectional schematic diagram of the first connecting portion and the second connecting portion of the present invention in the first position;

[0038] Fig. 9It is a cross-sectional schematic diagram of the first connecting part and the second connecting part of the present invention in the second position;

[0039] Fig.10 It is a schematic diagram of the structure of the reference frame of the present invention after being adjusted;

[0040] In the figure, 1. guide sleeve; 11. sleeve body; 12. blocking member; 2. handle; 21. first connecting part; 211. first engaging end face; 212. connecting shaft; 213. accommodating chamber; 22. spring; 3. connecting arm; 31. second connecting part; 311. second engaging end face; 312. connecting channel; 32. connecting arm; 4. cylinder core; 5. reference frame. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention are described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in 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.

[0042] Figure 1 —2 shows the main technical content of this embodiment. This specific embodiment provides a guide sleeve 1, which includes:

[0043] A handle 2, the handle 2 having a first connecting portion 21;

[0044] The guide sleeve 1 is connected to the first connecting portion 21 and can rotate relative to the first connecting portion 21;

[0045] The connecting arm 3 has a second connecting portion 31, and the connecting arm 3 is connected to the guide sleeve 1 through the second connecting portion 31, and rotates synchronously with the guide sleeve 1;

[0046] Among them, in the length extension direction of the guide sleeve 1, there is a first position and a second position between the second connection part 31 and the first connection part 21. In the first position, the first connection part 21 is engaged with the second connection part 31, so that the guide sleeve 1 is locked. In the second position, the first connection part 21 and the second connection part 31 are away from each other in the length extension direction of the guide sleeve 1, so that the first connection part 21 is separated from the second connection part 31, so as to allow the guide sleeve 1 to drive the connecting arm 3 to rotate relative to the first connection part 21.

[0047] When in use, first connect the reference frame 5 with the connecting arm 3, and then insert the guide sleeve 1 equipped with the reference frame 5 into the patient's body. At this time, the first connecting part 21 and the second connecting part 31 are in the first position, and the guide sleeve 1 cannot rotate relative to the handle 2. Then, according to the positional relationship between the identification probe of the navigation system and the patient's surgical area, the first connecting part 21 and the second connecting part 31 are converted from the first position to the second position. At this time, the first connecting part 21 and the second connecting part 31 are away from each other in the length extension direction of the guide sleeve 1. At this time, the surgeon applies force to the guide sleeve 1 or the connecting arm 32 to cause the guide sleeve 1 to rotate, thereby driving the connecting arm 3 and the reference frame 5 to rotate, and then adjusting the reference frame 5 to correspond to the identification probe of the navigation system, and then converting the first connecting part 21 and the second connecting part 31 to the first position, so that the orientation of the reference frame 5 is fixed, thereby realizing the adjustment of the orientation of the reference frame 5 so that it can be recognized by the navigation system.

[0048] refer to Figure 2 —4. In the present embodiment, the guide sleeve 1 comprises: a sleeve body 11 and a blocking member 12, wherein the sleeve body 11 is rotatably connected to the first connecting portion 21, wherein the sleeve body 11 can move relative to the first connecting portion 21 in its length direction; the blocking member 12 is arranged at one end of the sleeve body 11 and partially extends into the first connecting portion 21, wherein the blocking member 12 moves synchronously with the sleeve body 11, so as to approach and move away from the first connecting portion 21 in the direction of the first connecting portion 21 when the sleeve body 11 moves; more specifically, the second connecting portion 31 is fixedly connected to the sleeve body 11 and moves synchronously with the sleeve body 11, wherein the second connecting portion 31 is located below the first connecting portion 21 in the length extension direction of the sleeve body 11; when adjusting the orientation of the reference frame 5, first the first connecting portion 21 and the second connecting portion 31 are moved synchronously. The two connecting parts 31 are in the first position, and the operator holds the handle 2 and then applies force to the blocking member 12 with the thumb. At this time, the sleeve body 11 can move linearly relative to the first connecting part 21 in its length direction. During the movement, the sleeve body 11 drives the connecting arm 3 to move, so that the first connecting part 21 and the second connecting part 31 gradually move away from each other, thereby converting the first connecting part 21 and the second connecting part 31 from the first position to the second position. At this time, the first connecting part 21 and the second connecting part 31 are disengaged, and the sleeve body 11 can rotate relative to the first connecting part 21 (handle 2), thereby driving the connecting arm 3 to rotate, so that the orientation of the reference frame 5 connected to the connecting arm 3 also changes accordingly, so that the reference frame 5 corresponds to the identification probe of the navigation system.

[0049] More specifically, the sleeve body 11 is hollow, and the blocking member 12 is connected to the sleeve body 11 , so that during surgery, other surgical instruments can be delivered into the patient's body through the blocking member 12 and the sleeve body 11 .

[0050] Furthermore, the blocking member 12 and the sleeve body 11 are detachably connected, wherein the blocking member 12 and the sleeve body 11 are threadedly connected. When in use, firstly, the end of the sleeve body 11 connecting the blocking member 12 is passed through the first connecting portion 21. At this time, the first connecting portion 21 is located above the second connecting portion 31. Then, the blocking member 12 is threadedly connected to the sleeve body 11. During the connection process, part of the blocking member 12 extends into the first connecting portion 21. Under this arrangement, the handle 2 and the sleeve body 11 can be easily assembled, and the manufacturing difficulty of the device can also be reduced.

[0051] refer to Figure 8 In this embodiment, the first connecting portion 21 has an accommodating cavity 213, the sleeve body 11 passes through the accommodating cavity 213, and the blocking member 12 is partially located in the accommodating cavity 213, wherein the outer diameter of the blocking member 12 is larger than the outer diameter of the sleeve body 11, and the outer diameter of the blocking member 12 is the same as the diameter of the accommodating cavity 213, so that the outer wall of the blocking member 12 fits with the cavity wall of the accommodating cavity 213, and then when the sleeve body 11 moves relative to the first connecting portion 21, it can limit the sleeve body 11 so that it can move in a straight line.

[0052] refer to Figure 2—9, in addition, it also includes: a spring 22, the spring 22 is arranged around the outer wall of the sleeve body 11 and is located in the accommodating cavity 213, one end of the elastic member abuts against the bottom surface of the blocking member 12, and the other end of the spring 22 abuts against the bottom of the accommodating cavity 213. When the blocking member 12 moves from the first position to the second position between the first connecting portion 21 and the second connecting portion 31, the blocking member 12 approaches the first connecting portion 21, so that the spring 22 is compressed, and the second connecting portion 31 moves with the sleeve body 11 and moves away from the first connecting portion 21. When the connection portion 21 and the second connection portion 31 move from the second position to the first position, the spring 22 expands to drive the blocking member 12 to move in the direction away from the first connection portion 21, and the second connection portion 31 moves with the sleeve body 11 to engage with the first connection portion 21. When in use, when the operator holds the handle 2 to press the blocking member 12, the sleeve body 11 is forced to move, so that the blocking member 12 approaches the first connection portion 21. At this time, because the outer diameter of the blocking member 12 is larger than the outer diameter of the sleeve body 11, the blocking member 12 When moving, the spring 22 is compressed in the accommodating cavity 213. At this time, the second connecting portion 31 is disengaged from the first connecting portion 21 as the sleeve body 11 moves (the second position), so that the sleeve body 11 can be rotated. After the sleeve body 11 is rotated to make the reference frame 5 correspond to the identification probe of the navigation system, the blocking member 12 is stopped and the spring 22 is opened. Under the action of the elastic force of the spring 22, the blocking member 12 is moved away from the first connecting portion 21, and the second connecting portion 31 is driven by the sleeve body 11 to form an engagement relationship with the first connecting portion 21 (the first position), so that the sleeve body 11 is locked, so that during the operation, the reference frame 5 is always facing the identification probe of the navigation system. For this reason, under this setting, the locking state of the sleeve body 11 can be contacted only by pressing, and the locking of the adjusted reference frame 5 can be completed by stopping the force. Compared with the traditional method of repeatedly loosening and tightening the fasteners using special tools for adjustment, the adjustment steps and the time used are saved, the use of other instruments is reduced, and the infection rate of the patient is reduced.

[0053] refer to Figure 2—9, in this embodiment, the first connection portion 21 has a first joint end surface 211, wherein the first joint end surface 211 is provided with a connection shaft 212 extending in the direction of the second connection portion 31; the second connection portion 31 has a second joint end surface 311, wherein the second joint surface is provided with a plurality of connection channels 312 in a direction away from the first connection portion 21; wherein in the first position, the connection shaft 212 extends into one of the connection channels 312, and the first joint end surface 211 and the second joint end surface 311 are always in contact with each other under the action of the spring 22, and in the second position, the first joint end surface 21 1 is separated from the second engagement end face 311, and the connecting shaft 212 is disengaged from the connecting channel 312, so as to allow the sleeve body 11 to be able to axially rotate relative to the first connecting portion 21; when in use, the operator holds the handle 2 to press the blocking member 12, and the sleeve body 11 is forced to move, so that the blocking member 12 approaches the first connecting portion 21, and the second connecting portion 31 is disengaged from the first connecting portion 21 as the sleeve body 11 moves, so that the connecting shaft 212 gradually disengages from the connecting channel 312 until it is completely disengaged, and at this time, the sleeve body 11 loses the connection of the connecting shaft 212 to it. The second connecting portion 31 is constrained and can rotate relative to the first connecting portion 21. At this time, since the second connecting portion 31 is fixedly connected to the sleeve body 11, the connecting arm 3 also rotates synchronously with the sleeve body 11, thereby changing the orientation of the reference frame 5 connected to the connecting arm 3. After the orientation of the reference frame 5 is adjusted, the blocking member 12 is stopped. At this time, under the action of the elastic force of the spring 22, the second connecting portion 31 approaches the first connecting portion 21, and the connecting shaft 212 is inserted into the corresponding connecting channel 312 until the first joint end surface 211 and the second joint end surface 3 11 fits together, thereby fixing the sleeve body 11 and preventing the sleeve body 11 and the reference frame 5 from rotating, so that the reference frame 5 is always facing the identification probe of the navigation system. Under this setting, after adjusting the direction of the reference frame 5, it can be fixed quickly and stably, and when adjusting, the surgeon (operator) must hold the handle 2 to press the blocking member 12 to keep the first connecting part 21 away from the second connecting part 31, thereby achieving a self-locking effect, which avoids the reference frame 5 from being displaced due to accidental touching of the reference frame 5 or touching the blocking member 12 during the operation.

[0054] refer to Figure 2—6. Preferably, a plurality of connecting shafts 212 are provided, wherein the number of connecting shafts 212 is the same as the number of connecting channels 312. When in use, each connecting shaft 212 is individually inserted into the corresponding connecting channel 312. More specifically, the first connecting portion 21 has a first axis, wherein a plurality of connecting shafts 212 are circumferentially distributed on the first joint end surface 211 around the first axis, and a plurality of connecting channels 312 are circumferentially distributed on the second joint end surface 311 around the first axis. Preferably, the spacings between adjacent connecting shafts 212 are the same, and the spacings between adjacent connecting channels 312 are the same. Under this arrangement, the sleeve body 11 can be rotated slightly, thereby facilitating fine-tuning of the orientation of the reference frame 5.

[0055] As an alternative (not shown), the first joining end face 211 has a plurality of first protrusions, wherein first grooves are formed between adjacent first protrusions, and the second joining end face 311 has a plurality of second protrusions, wherein second grooves are formed between adjacent second protrusions. For explanation, the first protrusions and the first grooves, and the second protrusions and the second grooves are all wavy in shape. When the first joining end face 211 and the second joining end face 311 are in contact with each other, each first protrusion extends into a second groove, thereby forming a concave-convex matching relationship between the first connecting portion 21 and the second connecting portion 31, thereby forming a locking state for the sleeve body 11 and the reference frame 5 in the first position.

[0056] refer to Fig.10 In the present embodiment, it also includes: a core tube 4, one end of the core tube 4 passes through the blocking member 12 and the sleeve body 11, wherein the core tube 4 and the blocking member 12 are detachably connected; more specifically, the core tube 4 is hollow, and when in use, after the sleeve body 11 is partially inserted into the patient's body, one end of the core tube 4 passes through the blocking member 12 and then passes through the sleeve body 11, and the end of the core tube 4 that enters the patient's body abuts against the outer wall of the patient's bone, and the Kirschner wire is inserted into the patient's femur through the core tube 4.

[0057] More specifically, the core 4 has a variety of models and specifications, wherein each model of the core 4 has the same outer diameter but a different inner diameter, so that when in use, multiple cores 4 with different inner diameters are used to perform hole expansion operations on patients.

[0058] Furthermore, the blocking member 12 has a threaded hole, and the outer wall of the barrel core 4 is provided with a threaded section, wherein the threaded section is engaged with the threaded hole, thereby forming a connection relationship between the barrel core 4 and the blocking member 12. When in use, the barrel core 4 is rotated so that the barrel core 4 is connected to the blocking member 12 through the threaded section. When in specific use, the barrel core 4 is extended into the patient's body together with the sleeve body 11.

[0059] In this embodiment, the connecting arm 3 further includes: a connecting arm 32 , wherein the connecting arm 32 is integrally connected to the second connecting portion 31 , and when in use, the reference frame 5 is mounted on the connecting arm 32 .

[0060] In this embodiment, the handle 2 includes a grip connected to the first connecting portion 21 , wherein the grip is fixedly connected to the outer wall of the first connecting portion 21 and faces away from the sleeve body 11 . When in use, the operator holds the grip to apply force to the blocking member 12 .

[0061] The method of using this embodiment is as follows:

[0062] 1. First, connect the reference frame with the connecting arm, pass the core through the blocking member and out of the sleeve body, and connect the core with the blocking member, and then insert the sleeve body equipped with the reference frame and the core into the patient's body until one end of the core is against the patient's bone surface;

[0063] 2. According to the position of the patient's affected side, the operator's position and the position of the identification probe of the navigation system, the orientation of the reference frame is adjusted, wherein the operator holds the handle and then applies force to the blocking member with the thumb to move the sleeve body relative to the first connecting part so that the second connecting part moves away from the first connecting part. At this time, the connecting shaft of the first connecting part is disengaged from the connecting channel of the second connecting part, and the sleeve body can rotate relative to the first connecting part.

[0064] 3. Rotate the sleeve body. At this time, the connecting arm rotates with the sleeve body, so that the reference frame is adjusted to the ideal direction. After the adjustment is completed, stop applying force to the blocking member. At this time, under the action of the spring, the second connecting part approaches the first connecting part, and the connecting shaft is inserted into the corresponding connecting channel, thereby fixing the sleeve body to prevent the sleeve body and the reference frame from rotating, so that the reference frame is always facing the identification probe of the navigation system.

[0065] The above embodiments are only used to understand the present invention. It should be noted that, for those skilled in the art, several improvements can be made to the present invention without departing from the principles of the present invention, and these improvements will also fall within the scope of protection of the claims of the present invention.

Claims

1. A guide sleeve, characterized in that: It includes: A handle having a first connecting portion; a guide sleeve connected to the first connecting portion and capable of rotating relative to the first connecting portion; A connecting arm having a second connecting portion, wherein the connecting arm is connected to the guide sleeve via the second connecting portion and rotates synchronously with the guide sleeve; Wherein, in the length extension direction of the guide sleeve, there is a first position and a second position between the second connection part and the first connection part. In the first position, the first connection part is engaged with the second connection part, so that the guide sleeve is locked. In the second position, the first connection part and the second connection part are away from each other in the length extension direction of the guide sleeve, so that the first connection part is separated from the second connection part to allow the guide sleeve to drive the connecting arm to rotate relative to the first connection part.

2. The guide sleeve according to claim 1, characterized in that: The guide sleeve comprises: a sleeve body rotatably connected to the first connecting portion, wherein the sleeve body can move relative to the first connecting portion in a length direction thereof; a blocking member, disposed at one end of the sleeve body and partially extending into the first connecting portion, wherein the blocking member moves synchronously with the sleeve body to approach the first connecting portion and move away from the first connecting portion when the sleeve body moves; The second connection portion is fixedly connected to the sleeve body and moves synchronously with the sleeve body. The second connection portion is located below the first connection portion in the length extension direction of the sleeve body.

3. The guide sleeve according to claim 2, characterized in that: The first connecting portion has a receiving cavity, the sleeve body passes through the receiving cavity, and the blocking member is partially located in the receiving cavity; Wherein, it also includes: a spring, which is arranged around the outer wall of the sleeve body and located in the accommodating cavity, one end of the elastic member abuts against the bottom surface of the blocking member, and the other end of the spring abuts against the bottom of the accommodating cavity; When the first connection part and the second connection part move from the first position to the second position, the blocking member approaches the first connection part, so that the spring is compressed, and the second connection part moves away from the first connection part along with the sleeve body. When the first connection part and the second connection part move from the second position to the first position, the spring expands to drive the blocking member to move in the direction away from the first connection part, and the second connection part moves with the sleeve body and engages with the first connection part.

4. The guide sleeve according to claim 3, characterized in that: The diameter of the accommodating cavity is the same as the outer diameter of the blocking member, wherein the outer diameter of the blocking member is greater than the outer diameter of the sleeve body.

5. The guide sleeve according to claim 3, characterized in that: The first connection portion has a first joint end surface, wherein the first joint end surface is provided with a connection axis extending toward the second connection portion; The second connecting portion has a second connecting end surface, wherein the second connecting surface is provided with a plurality of connecting channels in a direction away from the first connecting portion; Among them, in the first position, the connecting shaft extends into one of the connecting channels, and the first joining end face and the second joining end face are always in contact under the action of the spring. In the second position, the first joining end face and the second joining end face are separated, and the connecting shaft is removed from the connecting channel to allow the sleeve body to rotate axially relative to the first connecting part.

6. The guide sleeve according to claim 5, characterized in that: A plurality of connecting shafts are provided, and the number of the connecting shafts is the same as the number of the connecting channels.

7. The guide sleeve according to claim 6, characterized in that: The first connecting portion has a first axis, wherein a plurality of connecting shafts are circumferentially distributed on the first joint end surface around the first axis, and a plurality of connecting channels are circumferentially distributed on the second joint end surface around the first axis.

8. The guide sleeve according to claim 7, characterized in that: The spacings between adjacent connecting shafts are the same, and the spacings between adjacent connecting channels are the same.

9. The guide sleeve according to claim 2, characterized in that: Also includes: A barrel core, one end of which passes through the blocking member and the sleeve body, wherein the barrel core is detachably connected to the blocking member.

10. The guide sleeve according to claim 9, characterized in that The blocking member has a threaded hole, and the outer wall of the barrel core is provided with a threaded section, wherein the threaded section is engaged with the threaded hole, thereby forming a connection relationship between the barrel core and the blocking member.

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