Internal fixing nail positioning guider with angle
By designing an angled internal fixation pin positioning guide, and using a directional guide sleeve and a flexible drill to perform directional drilling and implant bone pins at the site of hip labrum and cartilage injury, the problem of the inability of existing technologies to effectively repair hip labrum and cartilage injuries has been solved, and effective repair of hip labrum and cartilage has been achieved.
Patent Information
- Application Number
- CN202422310303.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Existing internal fixation pin positioning guides cannot effectively repair hip labral and cartilage injuries, especially when the hip labral and cartilage injuries are deep and the space is narrow, linear guides cannot achieve effective positioning and repair.
Design an angled internal fixation screw positioning guide, employing a reversible guide sleeve and a flexible drill or flexible inserter, capable of reversible drilling and implantation of absorbable screws at the glenoid surface structure to fix detached cartilage. The device includes a transverse handle, a protective sleeve, a reversible guide sleeve, a flexible drill, and a flexible inserter. The reversible operation of drilling and inserting bone screws is achieved by utilizing the arc-shaped reversible guide sleeve section and the flexible rod.
It enables effective repair of the labrum and cartilage in the confined curved surface of the hip joint, overcoming the shortcomings of linear guides in narrow spaces and improving the success rate and fixation effect of the surgery.
Smart Images
Figure CN223554914U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the orthopedics medical instrument technical field, concretely relates to a internal fixation nail positioning guider with angle. BACKGROUND
[0002] Human in intense activity, it is easy to cause joint movement injury. One of the joint injuries is hip joint labrum tear combined with cartilage injury, because its position is deep, the space is narrow, the straight type positioner cannot complete positioning and guiding. In order to treat this kind of joint labrum tear combined with cartilage injury, one of the current treatment methods is to use internal fixation nail positioning guider, under arthroscopy, use absorbable nail or bone nail to fix the torn joint labrum and cartilage at the original fracture, so that the joint labrum and cartilage are repaired. The existing internal fixation nail positioning guider is straight line type guide to internal fixation nail, and cannot repair the hip joint labrum injury and cartilage injury in deep position. CONTENT OF UTILITY MODEL
[0003] The utility model aims at designing a internal fixation nail positioning guider with angle, so that it can be drilled at the joint glenoid curvature structure, and then the absorbable nail is implanted, the detached cartilage is fixed, and the joint labrum and cartilage of the narrow space of hip joint can be repaired.
[0004] The technical scheme of the utility model is a internal fixation nail positioning guider with angle, which comprises a cross-grip handle, a protection sleeve, a direction-changing guide sleeve, a flexible drill and a flexible driver, the protection sleeve is fixed in the cross-grip handle, the direction-changing guide sleeve is installed at the front end of the protection sleeve, the front end of the direction-changing guide sleeve is provided with an arc-shaped turning guide sleeve section, the flexible drill or the flexible driver is loaded into the direction-changing guide sleeve from the rear end of the protection sleeve, the flexible rod is arranged between the drill head and the drill rod of the flexible drill, and the flexible rod is arranged between the bone nail connecting head and the driving rod of the flexible driver.
[0005] The front end of the direction-changing guide sleeve is provided with positioning teeth or / and observation holes.
[0006] The turning angle of the arc-shaped turning guide sleeve section at the front end of the direction-changing guide sleeve is 1°-90°.
[0007] The turning angle of the arc-shaped turning guide sleeve section at the front end of the direction-changing guide sleeve is 50°.
[0008] The flexible rod of the flexible drill and the flexible rod of the flexible driver are double-layer reverse dense coiled round wire springs or double-layer reverse dense coiled flat band springs.
[0009] The connecting part of the drill head of the flexible drill and the flexible rod is provided with a line contact guide block, and the connecting part of the bone nail connecting head of the flexible driver and the flexible rod is provided with a line contact guide block.
[0010] The shape of the line contact guide block is spherical, spherical disc, elliptical disc, double-cone disc, double-face chamfered disc or sheet disc.
[0011] The front end of the line contact guide block of the connecting part of the drill head of the flexible drill and the flexible rod is provided with a milling cutter.
[0012] The flexible rod of the flexible drill is provided with a line contact guide block, and the flexible rod of the flexible driver is provided with a line contact guide block.
[0013] A connecting sleeve is further included, and a horizontal grip handle is replaced by a vertical grip handle; the connecting sleeve is installed in a fixing hole on the vertical grip handle; the direction-changing guide sleeve is installed at the front end of the connecting sleeve; and the protection sleeve is installed at the rear end of the connecting sleeve.
[0014] The rear end of the direction-changing guide sleeve is provided with an angle locking nut at the connecting part with the connecting sleeve.
[0015] The fixing hole of the vertical grip handle is provided with a spring positioning ball, the outer circle of the connecting sleeve is provided with a positioning groove corresponding to the spring positioning ball, and a rotating hand wheel is further provided.
[0016] The front end of the direction-changing guide sleeve is provided with a triangular opening.
[0017] The lower edge of the triangular opening is tangent to the lower edge arc of the direction-changing guide sleeve.
[0018] The angle of the triangular opening is 25-45°; the length of the lower edge of the triangular opening is longer than that of the upper edge of the triangular opening by 0.2-10 mm; the upper edge of the triangular opening is provided with a transition arc at the intersection with the lower edge; the shape of the lower edge of the triangular opening is long-tongue-shaped, the top end of which is arc-shaped, and the two sides of which are straight; the top end of the upper edge of the triangular opening is provided with a positioning tooth, and / or the top end of the lower edge of the triangular opening is provided with a positioning tooth.
[0019] The preferred angle of the triangular opening is 35°; and the length of the lower edge of the triangular opening is longer than that of the upper edge of the triangular opening by 2 mm.
[0020] The opening direction of the triangular opening is horizontal, vertical and 45° positive / negative direction at the front end of the direction-changing guide sleeve.
[0021] The drill head of the flexible drill is a three-prism, four-prism or spiral twist drill.
[0022] The angle-bearing internal fixation nail positioning guider has the following advantages.
[0023] The flexible drill or the flexible driver is inserted into the variable-direction guide sleeve, the flexible rod on the flexible drill or the flexible driver is bent and changed direction under the guidance of the arc-shaped turning guide sleeve segment at the front end of the variable-direction guide sleeve, the drill bit on the flexible drill can drill in the joint bone cavity in a variable direction, the flexible driver can drive the bone nail into the joint bone cavity in a variable direction, so that the part of the joint bone that is broken and falls off in the joint bone cavity can be fixed. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 It is a perspective structural schematic view of the angle-bearing internal fixation nail positioning guider.
[0025] Figure 2 It is an enlarged sectional structural schematic view of the angle-bearing internal fixation nail positioning guider (with a transverse handle and being arranged in the flexible drill).
[0026] Figure 3 It is an enlarged sectional structural schematic view of the angle-bearing internal fixation nail positioning guider (with a transverse handle and being arranged in the flexible driver).
[0027] Figure 4 It is an enlarged sectional structural schematic view of the angle-bearing internal fixation nail positioning guider (with a transverse handle).
[0028] Figure 5 It is a structural schematic view of the flexible drill (adopting double-layer reverse densely-wound round wire spring).
[0029] Figure 6 It is an enlarged structural schematic view of the head of the flexible drill (adopting double-layer reverse densely-wound round wire spring).
[0030] Figure 7 It is an enlarged structural schematic view of the head of the flexible drill (adopting double-layer reverse densely-wound round wire spring).
[0031] Figure 8 It is a structural schematic view of the flexible driver (adopting double-layer reverse densely-wound flat band spring).
[0032] Figure 9 It is an enlarged structural schematic view of the head of the flexible driver (adopting double-layer reverse densely-wound flat band spring).
[0033] Figure 10 Structure diagram of flexible rod of double-layer reverse densely coiled round wire spring with line contact guide block.
[0034] Figure 11 Structure diagram of flexible rod of double-layer reverse densely coiled flat band spring with line contact guide block.
[0035] Figure 12 Enlarged sectional structure diagram of angle internal fixation nail positioning guide (with longitudinal handle).
[0036] Figure 13 Enlarged sectional structure diagram of angle internal fixation nail positioning guide (with spring positioning ball on longitudinal handle and positioning groove corresponding to spring positioning ball on rotating sleeve).
[0037] Figure 14 Enlarged sectional structure diagram of angle internal fixation nail positioning guide (with longitudinal handle). Figure 13 Enlarged sectional structure diagram of angle internal fixation nail positioning guide (with longitudinal handle).
[0038] Figure 15 Structure diagram of variable direction guide sleeve with triangular opening at front end.
[0039] Figure 16 Enlarged sectional structure diagram of triangular opening.
[0040] Figure 17 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end. Figure 16 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end.
[0041] Figure 18 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end. Figure 16 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end.
[0042] Figure 19 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end. Figure 16 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end.
[0043] Figure 20 Enlarged sectional structure diagram of variable direction guide sleeve with triangular opening at front end.
[0044] Explanation of reference numerals in the drawings:
[0045] 1. horizontal handle, 2. protection sleeve, 3. variable direction guide sleeve, 4. flexible drill, 5. flexible driver, 7. connecting sleeve, 8. longitudinal handle, 9. angle locking nut,
[0046] 301. arc-shaped turning guide sleeve section, 302. positioning tooth, 303. observation hole, 304. triangular opening, 305. lower edge of triangular opening, 306. upper edge of triangular opening, 307. transition arc
[0047] 401. drill head, 402. flexible rod, 403. drill rod, 404. milling cutter, 405. line contact guide block
[0048] 501. bone screw connector, 502. driving rod
[0049] 701. positioning slot, 702. rotating hand wheel
[0050] 801. spring positioning ball DETAILED DESCRIPTION
[0051] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme in the utility model embodiment will be described in more detail below in combination with the drawings in the utility model embodiment. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the utility model and its applications.
[0052] Embodiment 1
[0053] The angle internal fixation nail positioning guide described in this embodiment is shown in Figures 1 to 11 .
[0054] As shown in Figures 1 to 3 , the angle internal fixation nail positioning guide described in this embodiment comprises a cross handle 1, a protective sleeve 2, a direction-changing guide sleeve 3, a flexible drill 4 and a flexible driver 5; the protective sleeve 2 is fixed in the cross handle 1 by a pin; the direction-changing guide sleeve 3 is installed at the front end of the protective sleeve 2 by a thread, and the front end of the direction-changing guide sleeve 3 is provided with an arc-shaped turning guide sleeve segment 301; the flexible drill 4 or the flexible driver 5 is installed into the direction-changing guide sleeve 3 from the rear end of the protective sleeve 2, and is used for direction-changing drilling or direction-changing driving of a bone screw, respectively; the flexible drill 4 comprises a drill head 401, a drill rod 403 and a flexible rod 402, and the flexible rod 402 is arranged between the drill head 401 and the drill rod 403 of the flexible drill 4; the flexible driver 5 comprises a bone screw connector 501, a driving rod 502 and a flexible rod 402, and the flexible rod 402 is arranged between the bone screw connector 501 and the driving rod 502 of the flexible driver 5.
[0055] As shown in Figure 4 , the front end of the direction-changing guide sleeve 3 is provided with a positioning tooth 302 and an observation hole 303, the positioning tooth 302 is used for determining a drilling position in a bone cavity, and the observation hole 303 is used for observing the drilling of the drill head 401 and also used for observing the driving of the bone screw. The turning angle of the arc-shaped turning guide sleeve segment 301 at the front end of the direction-changing guide sleeve 3 is 1°-90°, and in this embodiment, the turning angle of the arc-shaped turning guide sleeve segment 301 is 50°.
[0056] As shown in Figure 5 and Figure 6As shown, the flexible rod 402 on the flexible drill 4 in this embodiment is a double-layered, reverse-winding round wire spring. The connection between the drill bit 401 and the flexible rod 402 of the flexible drill 4 is equipped with a line contact guide block 405. The line contact guide block 405 is used for positioning and guidance, enabling the drill bit 401 to smoothly pass through the arc-shaped guide sleeve section 301, maintaining the direction of the drill bit 401 following the arc-shaped turn of the guide sleeve section, reducing jamming, keeping the drill bit 401 stable, and aligning it with the drilling point in the bone cavity for drilling.
[0057] The line contact guide block 405 can be spherical, spherical disk, elliptical disk, double-conical disk, double-beveled disk, or thin disk. In this embodiment, the line contact guide block 405 at the drill bit 401 is spherical and is integrally formed with the drill bit 401.
[0058] The drill bit 401 of the flexible drill 4 is a triangular pyramid, a square pyramid, or a spiral twist drill bit. In this embodiment, the drill bit 401 is a triangular pyramid drill bit.
[0059] like Figure 7 As shown, a milling cutter 404 is provided at the front end of the line contact guide block 405 of the drill bit 401. The milling cutter 404 can mill a countersunk hole at the upper end of the drill hole in the bone cavity, which is convenient for placing the bone nail head.
[0060] like Figure 8 and Figure 9 As shown, the flexible rod 402 of the flexible inserter 5 in this embodiment is a double-layered, reverse-wound, tightly wound flat band spring. The connection between the bone screw connector 501 and the flexible rod 402 of the flexible inserter 5 has a line contact guide block 405. The line contact guide block 405 is used for positioning and guidance, enabling the bone screw connector 501 to smoothly pass through the arc-shaped guide sleeve section 301, maintaining the direction of the bone screw connector 501 with the arc-shaped turn of the guide sleeve section, reducing jamming, keeping the bone screw connector 501 stable, and aligning the bone screw with the drilled hole in the bone cavity. In this embodiment, the line contact guide block 405 at the bone screw connector 501 is spherical and integrally formed with the bone screw connector 501. The flexible rod 402 of the flexible inserter 5 uses a double-layered, reverse-wound, tightly wound flat band spring because of its high stiffness and good axial force transmission performance; during bone screw insertion, the double-layered, reverse-wound, tightly wound flat band spring is not easily deformed or deviated.
[0061] like Figure 10 and Figure 11 As shown, there are two flexible rods 402 with a double-layer reverse tightly wound round wire spring and a double-layer reverse tightly wound flat strip spring, respectively, with a line contact guide block 405. The line contact guide block 405 on the flexible rod 402 increases its support stiffness, improves the stability of the drill bit 401 or the bone screw connector 501 during rotation, and enhances the force transmission capacity of the flexible rod 402.
[0062] Example 2
[0063] The angled internal fixation pin positioning guide described in this embodiment is shown below. Figures 12 to 14 As shown.
[0064] like Figure 12 As shown, the angled internal fixing pin positioning guide further includes a connecting sleeve 7, and a longitudinal grip handle 8 replaces the transverse grip handle 1; the connecting sleeve 7 is fixedly installed in a fixing hole on the longitudinal grip handle 8 using a set screw; the reversing guide sleeve 3 is threadedly installed at the front end of the connecting sleeve 7; the protective sleeve 2 is threadedly installed at the rear end of the connecting sleeve 7. An angle locking nut 9 is provided at the connection point between the rear end of the reversing guide sleeve 3 and the connecting sleeve 7.
[0065] The angled internal fixation screw positioning guide described in this embodiment uses a longitudinal grip handle 8 to hold the bone screw reversing guide fixator, which can expand the applicability of the bone screw reversing guide fixator. The rear end of the reversing guide sleeve 3 has a turning angle marking, which makes it convenient for the surgeon to remember the rotation angle of the arc-shaped turning guide sleeve section 301 relative to the connecting sleeve 7. After the rotation angle is adjusted, the rotation position of the reversing guide sleeve 3 is locked with the angle locking nut 9.
[0066] like Figure 13 and Figure 14 As shown, a spring positioning ball 801 is provided on the fixing hole of the vertical grip handle 8, and a positioning groove 701 corresponding to the spring positioning ball 801 is provided on the outer circle of the connecting sleeve 7. The connecting sleeve 7 is equipped with a rotating handwheel 702, which is integrally formed with the connecting sleeve 7. Rotating the rotating handwheel 702 can adjust the rotation angle of the deflection guide sleeve 3 relative to the vertical grip handle 8, making it convenient and flexible to use.
[0067] Example 3
[0068] The angled internal fixation pin positioning guide described in this embodiment is shown below. Figures 15 to 20 As shown.
[0069] like Figure 15 and Figure 16 As shown, the front end of the reversing guide sleeve 3 has a triangular opening 304, the lower side 305 of the triangular opening is tangent to the lower edge arc of the reversing guide sleeve 3, the opening angle of the triangular opening 304 is 35°, and there is a transition arc 307 at the intersection of the upper side 306 of the triangular opening and the lower side 305 of the triangular opening.
[0070] like Figure 17 As shown, measured from axis A perpendicular to the reversing guide sleeve 3, the lower side 305 of the triangular opening is 2 mm longer than the upper side 306 of the triangular opening.
[0071] As shown in Figure 18 , the lower edge 305 of the triangular opening is in the shape of a long tongue, the top end is in the shape of a circular arc, and the two sides are in the shape of straight edges.
[0072] As shown in Figure 15 , Figure 16 and Figure 17 , the top end of the upper edge 306 of the triangular opening is provided with a positioning tooth 302. According to actual needs, the top end of the lower edge 305 of the triangular opening can also be provided with a positioning tooth 302. In this embodiment, the top end of the lower edge 305 of the triangular opening is not provided with a positioning tooth 302.
[0073] As shown in Figure 19 , the triangular opening 304 at the front end of the direction-changing guide sleeve 3 is shown in a perspective view to facilitate intuitive understanding of the shape of the triangular opening 304. In this embodiment, the opening direction of the triangular opening 304 is made in the horizontal direction of the front end of the direction-changing guide sleeve 3. According to actual needs, the opening direction of the triangular opening 304 can also be made in the vertical direction and the positive and negative 45° direction of the front end of the direction-changing guide sleeve 3.
[0074] As shown in Figure 20 , the working condition of the drill bit 401 passing through the triangular opening 304 at the front end of the direction-changing guide sleeve 3 is shown in a perspective view. The triangular opening 304 facilitates the surgeon to observe the drilling work condition or whether the bone nail is in place, thereby improving the success rate of the operation. The upper edge 306 of the triangular opening and the lower edge 305 of the triangular opening can keep the direction of the drill bit 401 or the bone nail connecting head 501 of the driving-in device 5 stable, thereby reducing deviation.
[0075] When the angle positioning guide for internal fixation nail is used, the front end of the direction-changing guide sleeve 3 is aligned with the position in the joint bone cavity where drilling is needed, and is positioned by the positioning tooth 302. The flexible drill 4 is loaded into the direction-changing guide sleeve 3 from the rear end of the protection sleeve 2. Under the guidance of the arc-shaped turning guide sleeve segment 301 at the front end of the direction-changing guide sleeve 3, the flexible rod 402 on the flexible drill 4 is bent and turned, so that the drill bit 401 on the flexible drill 4 can drill in the joint bone cavity in a changed direction. The milling cutter 404 at the front end of the line contact guide block 405 at the connection of the flexible rod 402 can mill a counterbore on the upper end of the drilled hole. After drilling is completed, the flexible drill 4 is removed, the flexible driving-in device 5 is loaded into the direction-changing guide sleeve 3 from the rear end of the protection sleeve 2, the bone nail is loaded on the bone nail connecting head 501, so that the flexible driving-in device 5 can drive the bone nail into the joint bone cavity in a changed direction, thereby being able to fix part of the broken and fallen joint bones in the joint bone cavity.
[0076] The angle internal fixing nail positioning guider has simple structure and is convenient to use, and overcomes the defects that the existing straight line type bone nail guiding fixer cannot change direction to drill holes and cannot change direction to drive bone nails in joint bone cavities.
[0077] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. An angled internal fixation screw positioning guide, characterized by: The invention relates to a flexible drill and driver, which comprises a horizontal handle, a protection sleeve, a direction-changing guide sleeve, a flexible drill and a flexible driver; the protection sleeve is fixed in the horizontal handle; the direction-changing guide sleeve is installed at the front end of the protection sleeve, and the front end of the direction-changing guide sleeve is provided with an arc-shaped turning guide sleeve section; the flexible drill or the flexible driver is installed in the direction-changing guide sleeve from the rear end of the protection sleeve; the flexible drill is provided with a flexible rod between the drill bit and the drill rod, and the flexible driver is provided with a flexible rod between the bone nail connecting head and the driving rod.
2. The angled internal fixation screw positioning guide of claim 1, wherein: The front end of the direction-changing guide sleeve is provided with positioning teeth or / and an observation hole.
3. The angled internal fixation screw positioning guide of claim 1, wherein: The turning angle of the arc-shaped turning guide sleeve section at the front end of the direction-changing guide sleeve is 1°-90°.
4. The angled internal fixation screw positioning guide of Claim 3, wherein: The turning angle of the arc-shaped turning guide sleeve section at the front end of the direction-changing guide sleeve is 50°.
5. The angled internal fixation screw positioning guide of Claim 1, wherein: The flexible rods of the flexible drill and the flexible driver are double-layer reverse tightly-wound round wire springs or double-layer reverse tightly-wound flat strip springs.
6. The angled internal fixation screw positioning guide of Claim 1, wherein: The connection between the drill bit and the flexible rod of the flexible drill is provided with a wire contact guide block, and the connection between the bone nail connecting head and the flexible rod of the flexible driver is provided with a wire contact guide block.
7. The angled internal fixation screw positioning guide of Claim 6, wherein: The shape of the wire contact guide block is spherical, spherical disc-shaped, elliptical disc-shaped, double-cone disc-shaped, double-face chamfered disc-shaped or sheet disc-shaped.
8. The angled internal fixation screw positioning guide of Claim 6, wherein: The front end of the wire contact guide block at the connection between the drill bit and the flexible rod of the flexible drill is provided with a milling cutter.
9. The angled internal fixation screw positioning guide of Claim 1, wherein: The flexible rod of the flexible drill is provided with a wire contact guide block, and the flexible rod of the flexible driver is provided with a wire contact guide block.
10. The angled internal fixation screw positioning guide of Claim 1, wherein: The invention further relates to a connecting sleeve and a longitudinal handle, wherein the connecting sleeve is installed in the fixing hole of the longitudinal handle, the direction-changing guide sleeve is installed at the front end of the connecting sleeve, and the protection sleeve is installed at the rear end of the connecting sleeve.
11. The angled internal fixation screw positioning guide of Claim 10, wherein: The connection between the rear end of the direction-changing guide sleeve and the connecting sleeve is provided with an angle locking nut.
12. The angled internal fixation screw positioning guide of Claim 10, wherein: The fixing hole of the longitudinal handle is provided with a spring positioning ball, the outer circle of the connecting sleeve is provided with a positioning groove corresponding to the spring positioning ball, and a rotating handle is further provided.
13. The angled internal fixation screw positioning guide of Claim 1, wherein: The front end of the direction-changing guide sleeve is provided with a triangular opening.
14. The angled internal fixation screw positioning guide of Claim 13, wherein: The lower edge of the triangular opening is tangent to the lower edge arc of the direction-changing guide sleeve.
15. The angled internal fixation screw positioning guide of Claim 13, wherein: The angle of the triangular opening is 25-45°, the length of the lower edge of the triangular opening is longer than that of the upper edge of the triangular opening by 0.2-10 mm, the upper edge of the triangular opening is provided with a transition arc at the intersection with the lower edge, the shape of the lower edge of the triangular opening is long-tongue-shaped, the top end of which is arc-shaped, and the two sides of which are straight, the top end of the upper edge of the triangular opening is provided with positioning teeth or / and the top end of the lower edge of the triangular opening is provided with positioning teeth.
16. The angled internal fixation screw positioning guide of Claim 15, wherein: The angle of the triangular opening is 35°, and the length of the lower edge of the triangular opening is longer than that of the upper edge of the triangular opening by 2 mm.
17. The angled internal fixation screw positioning guide of Claim 13, wherein: The opening direction of the triangular opening is horizontal, vertical and 45° positive / negative direction at the front end of the direction-changing guide sleeve.
18. The angled internal fixation screw positioning guide of Claim 1, wherein: The drill bit of the flexible drill is a three-prism, four-prism or spiral-shaped twist drill bit.