Hollow traction needle with resetting and fixing functions
The hollow traction pin design integrates reduction and fixation, solving the problems of insufficient reduction accuracy and poor fixation stability in traditional fracture treatment, thus improving surgical efficiency and patient rehabilitation outcomes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AEROSPACE CENT HOSPITAL
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-17
AI Technical Summary
Existing fracture reduction and fixation techniques suffer from problems such as complex operation, insufficient reduction accuracy, poor fixation stability, large trauma, and patient discomfort, especially in complex fractures and periarticular fractures.
Design a hollow traction pin that combines repositioning and fixation, including a fixing guide, a positioning pin, a guide pin, and a hollow screw. The guide and positioning pin initially fix the position, and the guide pin guides the hollow screw to be inserted, achieving integrated repositioning and fixation.
It improves reduction accuracy and fixation stability, simplifies surgical procedures, reduces trauma, shortens recovery time, enhances treatment effectiveness and patient comfort, and is particularly suitable for complex fractures and minimally invasive surgery.
Smart Images
Figure CN224126035U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of orthopedic device technology, specifically relating to a hollow traction pin that combines reduction and fixation. Background Technology
[0002] In the field of fracture reduction and fixation, traditional treatment methods primarily rely on surgical reduction and internal fixation techniques. Commonly used internal fixation devices include bone plates, screws, pins, and external fixators. These techniques are widely used in practice and have achieved good results in most fracture treatments; however, they have certain limitations in specific situations and still exhibit the following shortcomings in practice:
[0003] Operational Complexity: In current techniques, for some complex fractures, traction reduction and internal fixation often need to be performed in stages. After reduction, additional fixation is required, increasing the complexity of the surgery. Especially in the treatment of complex fractures such as long bone or pelvic fractures, traction devices are often used for reduction. Traction force, through external mechanical action, helps adjust and align the fracture ends. However, this method usually requires multiple steps, and additional internal fixation is needed after traction to maintain the reduced position. After reduction, fixation is often achieved using screws, plates, locking plates, etc., to ensure the fracture remains stable during healing. However, internal fixation is a cumbersome procedure, requiring precise implantation and multiple instrument changes, increasing the complexity and time of the surgery, as well as the surgical risks and the chance of infection.
[0004] Insufficient reduction precision: Traditional traction reduction devices have difficulty in accurately controlling the alignment of fracture ends, especially in multi-segment fractures or comminuted fractures. Uneven distribution of traction force may lead to unsatisfactory reduction. Even with imaging guidance, the reduction process still relies on the doctor's touch and experience, which may lead to errors.
[0005] Patient discomfort: External fixators are widely used as a temporary fixation method for some open fractures or multiple fractures. Although external fixators can provide a certain degree of stability, their stability is poor and they are prone to redisplacement. Furthermore, patients experience poor comfort while wearing external fixators, and prolonged use can easily lead to infection, skin pressure injury, or soft tissue complications. At the same time, external fixators also restrict patients' daily activities and rehabilitation exercises, affecting the recovery process.
[0006] Poor fixation stability: In some cases, internal fixation devices cannot simultaneously provide reduction and stability. For example, in fractures around the hip joint or pelvic fractures, internal or external fixation alone may not provide sufficient stability, easily leading to redisplacement or misalignment of the fracture ends, affecting healing outcomes.
[0007] Significant trauma: Multi-step procedures and complex instrument implantation processes can lead to greater tissue trauma and prolong patient recovery time. Especially in minimally invasive surgery, the separation of repositioning and fixation increases the invasiveness of the procedure, failing to fully realize the advantages of minimally invasive techniques.
[0008] In summary, while existing fracture reduction and fixation techniques are widely used in orthopedic surgery, they suffer from drawbacks such as complex procedures, insufficient reduction precision, poor fixation stability, significant trauma, and patient discomfort. These shortcomings are particularly pronounced when dealing with complex fractures, periarticular fractures, or pelvic fractures. Therefore, to address these issues, it is necessary to design an innovative instrument that can simultaneously achieve reduction and fixation, is easy to operate, and minimizes trauma, thereby improving the precision of reduction and the stability of fixation. Utility Model Content
[0009] In view of the above analysis, the present invention aims to provide a hollow traction needle that combines resetting and fixing, so as to solve one or more of the above-mentioned problems existing in the prior art.
[0010] The purpose of this utility model is achieved as follows:
[0011] A hollow traction needle that combines repositioning and fixation includes:
[0012] A fixed guide has a main body and a handle on the main body; a first through hole and a second through hole are provided along the length direction of the main body; the first through hole is a regular through hole, or the wall of the first through hole is provided with a side opening, the length of the side opening being equal to the axial length of the through hole; the handle is for the operator to hold;
[0013] The positioning pin is configured to be inserted into the bone through a second through-hole to fix the angle and position of the fixation guide;
[0014] Guide pin, configured to be inserted into the bone through the first through-hole;
[0015] A hollow screw, having a central channel, can be fitted onto a guide pin and is configured to be implanted into the bone through a first through-hole under the guidance of the guide pin.
[0016] Furthermore, there is one first through hole and multiple second through holes.
[0017] Furthermore, each of the multiple second through holes has a second inlet and a common second outlet, with the common second outlet located at one end of the main body abutting the bone; the positioning pin is inserted into the bone through different second through holes to adjust the angle and position of the fixation guide.
[0018] Furthermore, the diameter of the positioning pin is greater than or equal to the diameter of the guide pin.
[0019] Furthermore, the outer diameter of the guide pin is 1.6 mm; the outer diameter of the hollow screw is 6 mm, and the inner diameter is greater than 1.6 mm.
[0020] Furthermore, the inner diameter of the hollow screw is 2-3mm.
[0021] Furthermore, there are four second through holes, with the second inlets of three of the second through holes located on the same straight line, and the second inlet of the fourth second through hole located between the straight line containing the three second through holes and the first inlet of the first through hole.
[0022] Furthermore, the hollow screw has a threaded section at its front end, and the threaded section has bone threads.
[0023] Furthermore, the front end of the threaded section is provided with a self-tapping groove.
[0024] Furthermore, the hollow screw has a polished rod section at its rear end, and the tail end of the polished rod section has a screwing part that cooperates with a screwing tool.
[0025] Compared with existing technologies, the hollow traction pin provided by this utility model combines the functions of reduction and fixation, providing stable fixation while simultaneously reducing fractures. Furthermore, it provides traction force during reduction, allowing for precise adjustment of the fracture ends and maintaining the fracture position after reduction, reducing the risk of re-displacement. This application achieves an integrated design of reduction and fixation functions through structural optimization, overcoming the shortcomings of traditional techniques such as insufficient reduction accuracy, poor fixation stability, and surgical complexity. It significantly improves the efficiency and effectiveness of fracture treatment. Its minimally invasive nature, wide applicability, and enhanced patient comfort make it a promising candidate for clinical application, providing an efficient and safe solution for orthopedic surgery, especially for the treatment of complex fractures. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.
[0027] Figure 1 A schematic diagram of the hollow traction needle that combines repositioning and fixation provided by this utility model;
[0028] Figure 2 A partial structural diagram of the hollow traction needle that combines repositioning and fixation provided by this utility model. Figure 1 ;
[0029] Figure 3 A partial structural diagram of the hollow traction needle that combines repositioning and fixation provided by this utility model. Figure 2 ;
[0030] Figure 4 Disassembly diagram of the hollow traction pin that combines resetting and fixing provided by this utility model;
[0031] Figure 5 A schematic diagram of the second type of fixed guide provided by this utility model;
[0032] Figure 6 A schematic diagram of the structure of the hollow screw provided by this utility model;
[0033] Figure 7 A schematic diagram of a hollow traction needle that combines repositioning and fixation, in accordance with this utility model. Figure 1 ;
[0034] Figure 8 A schematic diagram of a hollow traction needle that combines repositioning and fixation, in accordance with this utility model. Figure 2 .
[0035] Figure label:
[0036] 1. Fixed guide; 11. Main body; 111. First through hole; 1111. Side opening; 112. Second through hole; 1121. Second hole inlet; 12. Handle; 121. Grip section; 122. Connecting section; 123. Weight reduction hole;
[0037] 2. Positioning pin;
[0038] 3. Guide needle;
[0039] 4. Hollow screw; 41. Threaded section; 411. Self-tapping groove; 42. Plain section; 421. Tightening part. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be noted that, unless otherwise specified, the implementation methods and features in the implementation methods in this disclosure can be combined, separated, interchanged, and / or rearranged. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0041] In the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.
[0042] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.
[0043] For descriptive purposes, this disclosure may use spatial relative terms such as “top,” “bottom,” “below,” “under,” “under,” “below,” “above,” “above,” “higher,” etc., which are relative to components, to describe the relationship between one component and another (other) component as shown in the accompanying drawings.
[0044] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values that would be recognized by one of ordinary skill in the art.
[0045] Example 1
[0046] A specific embodiment of this utility model is as follows: Figures 1 to 8 As shown, a hollow traction pin that combines repositioning and fixation is disclosed, hereinafter referred to as a "hollow traction pin". The hollow traction pin includes:
[0047] The fixed guide 1 has a main body 11 and a handle 12 provided on the main body 11; a first through hole 111 and a second through hole 112 are provided along the length direction of the main body 11; the handle 12 is for the operator to hold;
[0048] Positioning pin 2 is configured to be implanted into the bone through the second through hole 112 to fix the angle and position of the fixation guide 1;
[0049] Guide pin 3 is configured to be implanted into the bone through the first through hole 111;
[0050] Hollow screw 4, which has a central channel, can be fitted onto guide pin 3 and is configured to be implanted into the bone through first through hole 111 under the guidance of guide pin 3.
[0051] The main body 11 of the fixation guide 1 is first placed against the bone surface. A positioning pin 2 is inserted into one of the second through holes 112 and implanted into the bone to initially fix the position of the main body 11 of the fixation guide 1. The angle and insertion position of the positioning pin 2 are confirmed using CT or X-ray methods. If not, the positioning pin 2 is removed and inserted into the second through hole 112 at another angle until the insertion angle is satisfied. The positioning pin 2 is then implanted and fixed at a first predetermined depth. After the angle of the fixation guide 1 is initially fixed, a thin guide pin 3 is inserted into the first through hole 111. A hollow screw 4 is then used to implant the guide pin 3 into the bone at a second predetermined depth and fix it, thus completing the implantation of the hollow traction pin. The first predetermined depth is less than the second predetermined depth. After reduction, the hollow traction pin can be left directly at the fracture end as part of the fixation device, ensuring fracture stability by combining external fixation (such as plates or external fixators) or internal fixation (such as screws or locking plates).
[0052] The hollow traction pin provided in this embodiment is highly adaptable and particularly suitable for complex fracture types such as long bone fractures (e.g., femur, tibia, humerus), periarticular fractures (e.g., hip, knee), and pelvic fractures. Whether it's a multi-segment fracture, a comminuted fracture, or a fracture at a joint, this technique can achieve precise reduction and fixation. For example, because the pelvis is very thin, directly screwing the hollow screw 4 into the pelvis could potentially tear the pelvic wall, causing damage to the surrounding soft tissues and nerves. In this embodiment, the position and angle of the guide 1 are initially fixed using the positioning pin 2, thus determining the precise insertion position of the hollow screw in advance. Then, a very thin guide pin 3 is inserted for precise positioning, and the hollow screw 4 is then screwed into the bone while still attached to the guide pin 3, thereby minimizing damage to the pelvis.
[0053] The hollow traction pin provided in this embodiment has both repositioning and fixation functions. After completing the traction repositioning, the doctor does not need to replace or add additional fixation devices and can directly perform fixation operations through the traction pin. By reducing multiple instrument replacements and fixation steps, the surgical procedure is greatly simplified, the operation time and operation steps are reduced, the surgical difficulty is reduced, the entire surgical process is more efficient, the risk of infection during surgery (especially in minimally invasive surgery) and the trauma to the patient during surgery are reduced, the success rate of surgery is improved, the risk of infection during surgery and the possibility of complications are reduced, and the burden of external fixation devices on postoperative patients is also reduced.
[0054] In this embodiment, the hollow part of the hollow traction needle can also guide the implantation of other fixation devices or biomaterials to provide additional fixation support; for example, drugs can be implanted through the hollow channel of the hollow screw 4 to further enhance the fixation effect.
[0055] In this embodiment, the number of first through holes 111 on the main body 11 of the fixed guide 1 is one, and the number of second through holes 112 is multiple. By setting multiple inclined second through holes 112, positioning of the positioning pin 2 at different angles can be achieved.
[0056] In one optional embodiment, each of the plurality of second through holes 112 has a second inlet 1121 and a common second outlet. The common second outlet is located at the end of the main body 11 that abuts against the bone, and the plurality of second inlets 1121 are located at the end of the main body 11 that is away from the bone. The positioning pin 2 is inserted into the bone through different second through holes 112 to adjust the angle and fixed position of the fixation guide 1. That is, only one first through hole 111 has a first inlet and a first outlet. A portion of the plurality of second through holes 112 overlaps and has a common channel. The center lines of the non-overlapping portions of the plurality of second through holes 112 are at a certain angle to each other. Among the non-overlapping portions of the plurality of second through holes 112, at most one second through hole 112 has a center line parallel to the center line of the first through hole 111, while the rest are at a certain angle to the center line of the first through hole 111. This arrangement is to facilitate the adjustment of different fixed angles of the fixation guide 1. This structural design allows the main body 11 of the fixation guide 1 to be set to a smaller size, especially the main body 11 near the bone end is designed to be small.
[0057] It is understood that the multiple second through holes 112 can be independent through holes, each second through hole 112 has a second hole inlet 1121 and a second hole outlet, all second hole outlets do not overlap, the channels of each second through hole 112 do not overlap, the multiple second through holes 112 are arranged at an angle, and the center lines of the multiple second through holes 112 are at different angles from the center line of the first through hole 111.
[0058] In one alternative embodiment, the outer diameter of the guide pin 3 is 1.6 mm; the outer diameter of the hollow screw is 6 mm, and the inner diameter is greater than 1.6 mm. For example, the inner diameter of the hollow screw is 2-3 mm.
[0059] In one alternative embodiment, the diameter of the positioning pin 2 is greater than or equal to the diameter of the guide pin 3. Optionally, the diameter of the positioning pin 2 is 1.8-2 mm.
[0060] For example, the main body 11 has four second through holes 112, of which the second inlets 1121 of three second through holes 112 are located on the same straight line, and the second inlet 1121 of the fourth second through hole 112 is located between the straight line of the three second through holes 112 and the first inlet of the first through hole 111. This arrangement of the second through holes 112 allows the relatively large number of second inlets 1121 to be as far away from the first inlet as possible, avoiding interference with the pre-implanted positioning pin 2 when inserting the guide pin 3 and the hollow screw 4.
[0061] In this embodiment, the front end of the hollow screw 4 is provided with a threaded section 41, and the threaded section 41 has bone threads.
[0062] Furthermore, the front end of the threaded section 41 is provided with a self-tapping groove 411, which facilitates smoother implantation into the bone.
[0063] Furthermore, the rear end of the hollow screw 4 is provided with a smooth section 42, and the tail end of the smooth section 42 is provided with a tightening part 421 that cooperates with a tightening tool. Optionally, the tightening part 421 can be at least one cutting plane located on the circumferential surface of the smooth section 42, that is, the tightening part 421 includes at least one cutting plane located on the circumferential surface of the smooth section 42.
[0064] In this embodiment, the handle 12 is located on the outer wall of the end of the main body 11 that is relatively far away from the bone. The shape and position of the handle 12 will not block the first inlet of the first through hole 111 and the second inlet 1121 of the second through hole 112.
[0065] Specifically, the handle 12 has a gripping section 121 and a connecting section 122. The connecting section 122 is perpendicularly connected to the main body 11, and the gripping section 121 and the connecting section 122 are connected at an angle. For example, the angle between the gripping section 121 and the main body 11 is 110°-145°. Preferably, the angle between the gripping section 121 and the main body 11 is 120°.
[0066] In one alternative embodiment, the length of the connecting segment 122 is 1 / 4 to 3 / 10 of the length of the grip segment 121. This parameter setting provides a more comfortable grip angle for the operator, and the presence of the connecting segment 122 allows for better observation of the positions of the first through hole 111 and the second through hole 112 during operation, facilitating operation.
[0067] In this embodiment, the handle 12 is provided with a weight-reducing hole 123 to reduce the overall weight of the fixed guide 1. Optionally, the weight-reducing hole 123 is provided on the grip section 121, and the weight-reducing hole 123 is an elongated hole.
[0068] In minimally invasive surgery, the manipulator of a minimally invasive robot holds and fixes the guide needle 3, and inserts the guide needle 3 into the bone along the first through-hole 11. The manipulator then releases the guide needle 3, allowing it to exit through the first through-hole 111. In practice, releasing the guide needle 3 requires a certain amount of operating space. If the diameter of the first through-hole 111 is too small, it hinders the release and withdrawal of the manipulator. Increasing the diameter of the first through-hole 111 requires increasing the size of the main body 11, which is not conducive to minimally invasive procedures. Therefore, to facilitate easier withdrawal of the guide needle 3 from the first through-hole 111 after insertion into the bone by the manipulator of the minimally invasive robot, in one optional embodiment, see [reference needed]. Figure 5 and Figure 8 The first through hole 111 is configured as a semi-open hole, and a side opening 1111 is provided on the wall of the first through hole 111 along the axial direction, allowing the operating clamping end to enter and exit the first through hole 111 through the side opening 1111. Specifically, the first through hole 111 is a slot, and the bottom wall surface of the slot is curved. The wall of the first through hole 111 is not a complete cylindrical surface. The axial direction of the slot is arranged along the length direction of the main body 11. In addition to the openings at both ends along the axial direction, the slot has a side opening 1111 on its wall. The length of the side opening 1111 is equal to the length of the main body 11. It can also be understood that the slot is set on the outer wall of the main body 11, and the axial length of the slot is equal to the axial length of the main body 11.
[0069] Compared with the prior art, the hollow traction pin provided in this embodiment, which combines reset and fixation, has at least one of the following beneficial effects:
[0070] 1. It integrates repositioning and fixation functions, reducing surgical steps and improving surgical efficiency. Moreover, it has strong fixation stability, enhancing postoperative healing.
[0071] Because the hollow traction pin in this embodiment has both reduction and fixation functions, the surgeon does not need to replace or add additional fixation devices after completing traction reduction. Fixation can be performed directly through the traction pin. This significantly simplifies the surgical procedure, reduces surgical time and steps, and lowers the difficulty of the surgery, making the entire process more efficient. The hollow traction pin not only achieves precise traction reduction but can also be directly placed at the fracture site as a fixation device, providing continuous and stable support. The fixation effect is stable, effectively avoiding the problem of fracture re-displacement after reduction in traditional fixation methods. This ensures the fracture maintains an ideal position during healing, maintains a good biomechanical environment at the fracture site, promotes rapid bone healing, and reduces unnecessary secondary surgeries.
[0072] 2. It achieves precise traction and repositioning, effectively reducing repositioning errors and improving treatment outcomes.
[0073] Traditional traction devices may lead to unsatisfactory reduction due to uneven force distribution. However, the hollow traction pin provided in this embodiment can provide continuous, stable, and uniform traction force to the fracture site, ensuring precise alignment of the fracture ends during reduction, reducing reduction errors, and improving the accuracy of fracture reduction. Furthermore, with real-time imaging guidance, doctors can precisely adjust the position of the traction pin and the traction force as needed, restoring the fracture segments to the ideal anatomical position and ensuring perfect fracture reduction. This is particularly suitable for challenging cases such as multi-segment fractures, comminuted fractures, and complex joint fractures, effectively reducing reduction errors and ensuring treatment effectiveness.
[0074] 3. It is suitable for minimally invasive surgery, reducing patient discomfort and shortening the recovery period.
[0075] Compared to traditional devices such as external fixators, the hollow traction pin in this embodiment is lighter and can complete the repositioning and fixation operations in minimally invasive surgery. This reduces the need for repeated instrument changes and fixation device implantation in traditional surgery, thus minimizing damage to soft and bone tissues, reducing postoperative discomfort, and potentially shortening recovery time. Due to its minimal trauma and stable fixation, patients can begin rehabilitation exercises earlier, reducing postoperative complications. Furthermore, patients do not need to wear external fixators for extended periods, improving their postoperative quality of life.
[0076] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A hollow traction needle that combines repositioning and fixation, characterized in that, include: A fixed guide (1) has a main body (11) and a handle (12) provided on the main body (11); a first through hole (111) and a second through hole (112) are provided along the length direction of the main body (11); the handle (12) is for the operator to hold; Positioning pin (2), which is configured to be implanted into the bone through the second through hole (112) to fix the angle and position of the fixation guide (1); Guide needle (3), the guide needle (3) is configured to be implanted into the bone through the first through hole (111); A hollow screw (4) having a central channel is fitted onto the guide pin (3) and is configured to be implanted into the bone through the first through hole (111) under the guidance of the guide pin (3).
2. The hollow traction screw according to claim 1, wherein The number of the first through hole (111) is one, and the number of the second through hole (112) is multiple.
3. The hollow k-wire of claim 2, wherein, Each of the multiple second through holes (112) has a second hole inlet (1121) and a common second hole outlet, the common second hole outlet being located at one end of the body (11) abutting the bone; the positioning pin (2) is inserted into the bone through different second through holes (112) to adjust the angle and fixed position of the fixation guide (1).
4. The hollow k-wire of claim 1, wherein, The diameter of the positioning pin (2) is greater than or equal to the diameter of the guide pin (3).
5. The hollow k-wire of claim 1, wherein, The outer diameter of the guide needle (3) is 1.6 mm; The hollow screw (4) has an outer diameter of 6 mm and an inner diameter greater than 1.6 mm.
6. The hollow k-wire of claim 5, wherein, The inner diameter of the hollow screw (4) is 2-3 mm.
7. The hollow k-wire of claim 3, wherein, There are four second through holes (112), three of which have their second inlets (1121) on the same straight line, and the fourth has its second inlet (1121) between the straight line of the three second through holes (112) and the first inlet of the first through hole (111).
8. The hollow k-wire of claim 1, wherein, The hollow screw (4) has a threaded section (41) at its front end, and the threaded section (41) has bone threads.
9. The hollow k-wire of claim 8, wherein, The front end of the threaded section (41) is provided with a self-tapping groove (411).
10. The hollow k-wire of claim 1, wherein, The hollow screw (4) has a smooth rod section (42) at its rear end, and the tail end of the smooth rod section (42) has a screwing part (421) that cooperates with a screwing tool.