A guiding sleeve

Abstract

The present invention belongs to the technical field of medical devices, and particularly relates to a guiding sleeve, which mainly includes: a handle having a first connecting portion; a guiding sleeve connected to the first connecting portion and capable of rotating relative to the first connecting portion; a connecting support arm having a second connecting portion, and the connecting support arm is connected to the guiding sleeve through the second connecting portion and rotates synchronously with the guiding sleeve; wherein, in the length extension direction of the guiding sleeve, there are a first position and a second position between the second connecting portion and the first connecting portion. In the first position, the first connecting portion and the second connecting portion are engaged, so that the guiding sleeve is locked. In the second position, the first connecting portion and the second connecting portion are separated from each other in the length extension direction of the guiding sleeve, so that the first connecting portion and the second connecting portion are disengaged, allowing the guiding sleeve to drive the connecting support arm to rotate relative to the first connecting portion.

Description

Technical Field

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

[0002] Surgical navigation is a computer-aided technology that uses three-dimensional imaging information to help doctors determine anatomical structures during surgery. The navigation system can provide the positional relationship between the patient's anatomical structure and the surgical instrument, enabling the surgical path to be planned in advance and guiding the doctor to avoid important organizational structures such as important nerves and blood vessels.

[0003] For example, in the intertrochanteric femoral fracture internal fixation surgery (PFNA), since there are many types of instruments involved in the intertrochanteric surgery and the surgical environment in the intertrochanteric region is relatively complex, if the outer sleeve is made to correspond one by one with the operation reference frame, a very large number of instruments will be set up; therefore, it is thought to reduce the individual requirements of the instruments in an adjustable manner. The most critical instruments used in the intertrochanteric surgery include the guiding sleeve instrument. The sleeve instrument is mostly tubular. For the convenience of the doctor's operation, a handle is provided on the outside of the sleeve instrument. Among them, the sleeve instrument also needs to be externally connected to a reference frame during use. For example, a reference frame with an NDI optical ball is used so that the sleeve instrument can be recognized by the navigation system. During the surgery, the patient's position on the operating table remains stationary, and the position between the recognition probe of the navigation system and the patient also remains unchanged. Therefore, during the surgical preparation period, it is necessary to adjust the orientation of the reference frame according to the position of the patient's affected side and the position of the recognition probe of the navigation system.

[0004] Currently, common fasteners such as bolts are used to fix the reference frame outside the sleeve instrument. Special tools are required 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 and attitude of the reference frame to make it correspond to the recognition probe of the navigation system. Finally, the state of the fasteners is adjusted again using special tools to re-fix the positional relationship between the reference frame and the sleeve instrument. It can be seen that the entire adjustment process is relatively cumbersome and takes a long time; moreover, special tools unrelated to the surgery are required, increasing the infection probability.

[0005] The present invention aims at the above problems and provides a guiding sleeve. Summary of the Invention

[0006] In order to overcome the problems raised in the background art, the present invention adopts the following technical solutions:

[0007] A guiding sleeve, which comprises:

[0008] A handle, the handle having a first connecting portion;

[0009] A sleeve, connected to the first connecting portion and capable of rotating relative to the first connecting portion;

[0010] The connecting arm has a second connecting portion, and the connecting arm is connected to the sleeve through the second connecting portion and rotates synchronously with the sleeve.

[0011] Wherein, in the length extension direction of the sleeve, there is a first position and a second position between the second connecting portion and the first connecting portion. In the first position, the first connecting portion and the second connecting portion are engaged, so that the sleeve is locked. In the second position, the first connecting portion and the second connecting portion are separated from each other in the length extension direction of the sleeve, so that the first connecting portion and the second connecting portion are separated to allow the sleeve to drive the connecting arm to rotate relative to the first connecting portion.

[0012] In some embodiments of the present application, the sleeve includes:

[0013] A cylinder body, which is rotatably connected to the first connecting portion. Wherein, the cylinder body can move relative to the first connecting portion in its length direction.

[0014] A blocking member, which is disposed at one end of the cylinder body and partially extends into the first connecting portion. Wherein, the blocking member moves synchronously with the cylinder body to approach and move away from the first connecting portion in the direction of the first connecting portion when the cylinder body moves.

[0015] Wherein, the second connecting portion is fixedly connected to the cylinder body and moves synchronously with the cylinder body. Wherein, the second connecting portion is located below the first connecting portion in the length extension direction of the cylinder body.

[0016] Furthermore, the first connecting portion has a receiving cavity, the cylinder body passes through the receiving cavity, and the blocking member is partially located in the receiving cavity.

[0017] Wherein, it further includes: a spring. The spring is wound around the outer wall of the cylinder body and is located in the receiving cavity. One end of the spring abuts against the bottom surface of the blocking member, and the other end of the spring abuts against the bottom of the receiving cavity. When moving from the first position to the second position between the first connecting portion and the second connecting portion, the blocking member approaches the first connecting portion, so that the spring is compressed, and the second connecting portion moves away from the first connecting portion along with the cylinder body. When moving from the second position to the first position between the first connecting portion and the second connecting portion, the spring expands to drive the blocking member to move in a direction away from the first connecting portion, and the second connecting portion moves to engage with the first connecting portion along with the cylinder body.

[0018] Further, the diameter of the accommodation 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 cylinder body.

[0019] Further, the first connecting portion has a first engaging end face, wherein a connecting shaft extending in the direction of the second connecting portion is provided on the first engaging end face;

[0020] The second connecting portion has a second engaging end face, wherein a plurality of connecting channels are provided on the second engaging end face and open in a direction away from the first connecting portion;

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

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

[0023] Further, the distance between adjacent connecting shafts is the same, and the distance between adjacent connecting channels is the same.

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

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

[0026] Advantages of the present invention:

[0027] 1. By providing a sleeve, a first connecting portion and a second connecting portion, during use, by applying force to the blocking member and the cylinder body, the cylinder body moves relative to the first connecting portion, and further the first connecting portion and the second connecting portion move from the first position to the second position, so that the cylinder body can rotate and drive the reference frame to rotate. In this way, the orientation of the reference frame is adjusted, and after the force applied to the blocking member is stopped, under the action of the spring, the first connecting portion and the second connecting portion can be reset to the first position, thereby completing the locking of the cylinder body. Compared with the traditional method of repeatedly loosening and tightening the fasteners with special tools for adjustment, it saves the adjustment steps and the time used, and reduces the use of other instruments, reducing the infection probability of patients.

[0028] 2. By providing a handle, during use, only when the operator holds the handle can force be applied to the blocking member and the cylinder body, causing them to move relative to the first connecting portion, and further achieving a self-locking effect, which avoids the reference frame being accidentally touched during the operation or the reference frame being displaced after touching the blocking member.

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

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

[0031] Figure 2 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 is a schematic diagram of the structure of the first connecting portion and the second connecting portion of the present invention at the first position;

[0033] Figure 4 is a schematic diagram of the structure of the first connecting portion and the second connecting portion of the present invention at the second position;

[0034] Figure 5 is a schematic diagram of the structure of the first engaging end face of the present invention;

[0035] Figure 6 is a schematic diagram of the structure of the second engaging end face of the present invention;

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

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

[0038] Figure 9 is a schematic cross-sectional view of the first connecting portion and the second connecting portion of the present invention at the second position;

[0039] Figure 10 is a schematic diagram of the structure of the reference frame after being adjusted in the present invention;

[0040] In the figures, 1. sleeve; 11. cylinder body; 12. blocking member; 2. handle; 21. first connecting portion; 211. first engaging end face; 212. connecting shaft; 213. receiving cavity; 22. spring; 3. connecting support arm; 31. second connecting portion; 311. second engaging end face; 312. connecting hole; 32. connecting arm; 4. core; 5. reference frame. DETAILED DESCRIPTION OF THE INVENTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below through specific specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

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

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

[0044] A sleeve 1, connected to the first connecting portion 21 and capable of rotating relative to the first connecting portion 21;

[0045] A connecting arm 3, having a second connecting portion 31, the connecting arm 3 being connected to the sleeve 1 through the second connecting portion 31 and rotating synchronously with the sleeve 1;

[0046] Wherein, in the length extension direction of the sleeve 1, there is a first position and a second position between the second connecting portion 31 and the first connecting portion 21. In the first position, the first connecting portion 21 is engaged with the second connecting portion 31, so that the sleeve 1 is locked. In the second position, the first connecting portion 21 and the second connecting portion 31 are separated from each other in the length extension direction of the sleeve 1, so that the first connecting portion 21 and the second connecting portion 31 are disengaged, allowing the sleeve 1 to drive the connecting arm 3 to rotate relative to the first connecting portion 21.

[0047] In use, first connect the reference frame 5 to the connecting support arm 3, and then insert the sleeve 1 equipped with the reference frame 5 partially into the patient's body. At this time, when the first connecting portion 21 and the second connecting portion 31 are in the first position, the sleeve 1 cannot rotate relative to the handle 2. Then, according to the positional relationship between the recognition probe of the navigation system and the patient's surgical area, the first connecting portion 21 and the second connecting portion 31 are converted from the first position to the second position. At this time, the first connecting portion 21 and the second connecting portion 31 are separated from each other in the length extension direction of the sleeve 1. At this time, the operator applies a force to the sleeve 1 or the connecting arm 32 to cause the sleeve 1 to rotate, thereby driving the connecting support arm 3 and the reference frame 5 to rotate, and then adjusting the reference frame 5 to correspond to the recognition probe of the navigation system. Then, the first connecting portion 21 and the second connecting portion 31 are converted 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] Reference Figure 2 —4, in this embodiment, the sleeve 1 includes: a cylinder body 11 and a blocking member 12. The cylinder body 11 is rotatably connected to the first connecting portion 21. Among them, the cylinder body 11 can move relative to the first connecting portion 21 in its length direction; the blocking member 12 is disposed at one end of the cylinder body 11 and partially extends into the first connecting portion 21. Among them, the blocking member 12 moves synchronously with the cylinder body 11 to approach and move away from the first connecting portion 21 in the direction of the first connecting portion 21 when the cylinder body 11 moves; more specifically, the second connecting portion 31 is fixedly connected to the cylinder body 11 and moves synchronously with the cylinder body 11. Among them, the second connecting portion 31 is located below the first connecting portion 21 in the length extension direction of the cylinder body 11; when adjusting the orientation of the reference frame 5, first, the first connecting portion 21 and the second connecting portion 31 are in the first position. The operator holds the handle 2, and then applies a force to the blocking member 12 with the thumb. At this time, the cylinder body 11 can move linearly relative to the first connecting portion 21 in its length direction. During the movement of the cylinder body 11, it drives the connecting support arm 3 to move, so that the first connecting portion 21 and the second connecting portion 31 gradually move away from each other. In this way, the first connecting portion 21 and the second connecting portion 31 are converted from the first position to the second position. At this time, the first connecting portion 21 and the second connecting portion 31 are disengaged, and the cylinder body 11 can rotate relative to the first connecting portion 21 (handle 2), thereby driving the connecting support arm 3 to rotate, so that the orientation of the reference frame 5 connected to the connecting support arm 3 also changes accordingly, so that the reference frame 5 corresponds to the recognition probe of the navigation system.

[0049] More specifically, the cylinder body 11 is hollow, and the blocking member 12 is communicated with the cylinder body 11. Thus, during the operation, other surgical instruments are sent into the patient's body through the blocking member 12 and the cylinder body 11.

[0050] Further, the blocking member 12 and the cylinder 11 are detachably connected. Specifically, the blocking member 12 and the cylinder 11 are threadedly connected. During use, first, the end of the cylinder 11 connected to the blocking member 12 passes 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 cylinder 11. During the connection process, a part of the blocking member 12 extends into the first connecting portion 21. In this setting method, it is convenient to assemble the handle 2 and the cylinder 11, and at the same time, it can also reduce the manufacturing difficulty of the instrument.

[0051] Reference Figure 8 , in this embodiment, the first connecting portion 21 has a receiving cavity 213. The cylinder 11 passes through the receiving cavity 213, and a part of the blocking member 12 is located in the receiving cavity 213. The outer diameter of the blocking member 12 is larger than the outer diameter of the cylinder 11, and the outer diameter of the blocking member 12 is the same as the diameter of the receiving cavity 213. In this way, the outer wall of the blocking member 12 fits against the cavity wall of the receiving cavity 213. Further, when the cylinder 11 moves relative to the first connecting portion 21, it can limit the cylinder 11 to move in a straight line.

[0052] Reference Figure 2—9. Additionally, it further includes: a spring 22, which is disposed around the outer wall of the cylinder body 11 and is located within the accommodation cavity 213. One end of the spring 22 abuts against the bottom surface of the blocking member 12, and the other end of the spring 22 abuts against the bottom of the accommodation cavity 213. When moving 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, causing the spring 22 to be compressed. The second connecting portion 31 moves away from the first connecting portion 21 as the cylinder body 11 moves. When moving from the second position to the first position between the first connecting portion 21 and the second connecting portion 31, the spring 22 expands to drive the blocking member 12 to move in a direction away from the first connecting portion 21, and the second connecting portion 31 moves with the cylinder body 11 to engage with the first connecting portion 21. During use, when the operator holds the handle 2 and presses the blocking member 12, at this time, the cylinder body 11 is forced to move, causing the blocking member 12 to approach the first connecting portion 21. At this time, because the outer diameter of the blocking member 12 is larger than the outer diameter of the cylinder body 11, when the blocking member 12 moves, the spring 22 is compressed within the accommodation cavity 213. At this time, the second connecting portion 31 moves with the cylinder body 11 to disengage from the engaged state (second position) with the first connecting portion 21, thereby enabling the cylinder body 11 to rotate. After rotating the cylinder body 11 so that the reference frame 5 corresponds to the identification probe of the navigation system, stop pressing the blocking member 12. The spring 22 expands, and under the action of the elastic force of the spring 22, the blocking member 12 moves away from the first connecting portion 21, and the cylinder body 11 drives the second connecting portion 31 to form an engaged relationship (first position) with the first connecting portion 21, thereby locking the cylinder body 11, so that during the operation, the reference frame 5 always faces the identification probe of the navigation system. Therefore, in this setting, the locking state of the cylinder body 11 can be released only by a pressing action, and the locking after adjusting the reference frame 5 can be completed by stopping applying force. Compared with the traditional method of repeatedly loosening and tightening the fasteners using special tools for adjustment, it saves the adjustment steps and the time used, and reduces the use of other instruments, reducing the infection probability of patients.

[0053] Reference Figure 2—9, in this embodiment, the first connecting portion 21 has a first joint end face 211, wherein a connecting shaft 212 extending in the direction of the second connecting portion 31 is provided on the first joint end face 211; the second connecting portion 31 has a second joint end face 311, wherein a plurality of connecting channels 312 are formed in the second joint end face 311 in a direction away from the first connecting portion 21; wherein, in the first position, the connecting shaft 212 extends into one of the connecting channels 312, and the first joint end face 211 and the second joint end face 311 are always in contact under the action of the spring 22. In the second position, the first joint end face 211 and the second joint end face 311 are separated, and the connecting shaft 212 is disengaged from the connecting channel 312 to allow the cylinder 11 to rotate axially relative to the first connecting portion 21; during use, the operator holds the handle 2 and presses the blocking member 12. At this time, the cylinder 11 is forced to move, so that the blocking member 12 approaches the first connecting portion 21. The second connecting portion 31 is disengaged from the first connecting portion 21 as the cylinder 11 moves, so that the connecting shaft 212 gradually disengages from the connecting channel 312 until it is completely disengaged. At this time, the cylinder 11 loses the constraint of the connecting shaft 212 on it, and thus can rotate relative to the first connecting portion 21. At this time, since the second connecting portion 31 is fixedly connected to the cylinder 11, the connecting arm 3 also rotates synchronously with the cylinder 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 force applied to 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 face 211 and the second joint end face 311 are in contact, thereby fixing the cylinder 11 to prevent the cylinder 11 and the reference frame 5 from rotating automatically, so that the reference frame 5 always faces the recognition probe of the navigation system. In this setting, after the orientation of the reference frame 5 is adjusted, rapid and stable fixation can be achieved. Moreover, during adjustment, the operator must hold the handle 2 and press the blocking member 12 to separate the first connecting portion 21 from the second connecting portion 31, which can also achieve a self-locking effect, avoiding the displacement of the reference frame 5 caused by accidentally touching the reference frame 5 or the blocking member 12 during the operation.

[0054] Reference 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, and 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, it is convenient for the cylinder 11 to be able to rotate 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. By way of 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 cylinder 11 and the reference frame 5 in the first position.

[0056] refer to Figure 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 barrel 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 barrel 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 barrel 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 barrel body 11.

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

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

[0061] The usage method of this embodiment:

[0062] 1. First, connect the reference frame to the connecting support arm. Pass the core through the blocking member and out of the cylinder body, and form a connection relationship between the core and the blocking member. Then insert the part of the cylinder body equipped with the reference frame and the core into the patient's body until one end of the core abuts against the bone surface of the patient.

[0063] 2. According to the position of the patient's affected side, the operator's standing position, and the position of the recognition probe of the navigation system, adjust the orientation of the reference frame. The operator holds the grip, and then the thumb applies force to the blocking member, causing the cylinder body to move relative to the first connecting portion, so that the second connecting portion moves away from the first connecting portion. At this time, the connecting shaft of the first connecting portion disengages from the connecting hole of the second connecting portion, and the cylinder body can rotate relative to the first connecting portion.

[0064] 3. Rotate the cylinder body. At this time, the connecting support arm rotates with the cylinder body, so that the reference frame is adjusted to the ideal orientation. After the adjustment is completed, stop applying force to the blocking member. At this time, under the action of the spring, the second connecting portion approaches the first connecting portion, and the connecting shaft is inserted into the corresponding connecting hole, thereby fixing the cylinder body and preventing the cylinder body and the reference frame from rotating, so that the reference frame always faces the recognition probe of the navigation system.

[0065] The description of the above embodiment is only for understanding the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can be made to the present invention, and these improvements will also fall within the protection scope of the claims of the present invention.

Claims

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

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

3. The guiding sleeve according to claim 2, characterized in that, The first connecting portion has a receiving cavity, the cylinder body passes through the receiving cavity, and the blocking member is partially located in the receiving cavity; Wherein, it further includes: a spring, the spring is disposed around the outer wall of the cylinder body and is located in the receiving cavity, one end of the spring abuts against the bottom surface of the blocking member, and the other end of the spring abuts against the bottom of the receiving cavity; When moving from the first position to the second position between the first connecting portion and the second connecting portion, the blocking member approaches the first connecting portion, so that the spring is compressed, and the second connecting portion moves away from the first connecting portion as the cylinder body moves. When moving from the second position to the first position between the first connecting portion and the second connecting portion, the spring expands to drive the blocking member to move in a direction away from the first connecting portion, and the second connecting portion moves to engage with the first connecting portion as the cylinder body moves.

4. The guide sleeve according to claim 3, characterized in that, The diameter of the receiving 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 cylinder body.

5. The guiding sleeve according to claim 3, characterized in that, The first connecting portion has a first engaging end face, wherein a connecting shaft extending in the direction of the second connecting portion is provided on the first engaging end face; The second connecting portion has a second engaging end face, wherein a plurality of connecting channels are provided on the second engaging end face opening in a direction away from the first connecting portion; Wherein, under the first position, the connecting shaft extends into one of the connecting channels, and the first engaging end face and the second engaging end face are always in contact under the action of the spring. Under the second position, the first engaging end face and the second engaging end face are separated, and the connecting shaft disengages from the connecting channel to allow the cylinder body to rotate axially relative to the first connecting portion.

6. The guide sleeve according to claim 5, wherein, A plurality of the 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. Among them, a plurality of the connecting shafts are circumferentially distributed on the first engaging end face around the first axis, and a plurality of the connecting channels are circumferentially distributed on the second engaging end face around the first axis.

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

9. The guiding sleeve according to claim 2, characterized in that, Further comprising: A core, one end of the core passes through the blocking member and the cylinder body, wherein the 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 a threaded section is provided on the outer wall of the core. Among them, the threaded section meshes with the threaded hole, whereby the core and the blocking member form a connection relationship.

Images