Self-locking arc-shaped nail

Abstract

The invention discloses a self-locking arc-shaped nail, and relates to the field of fracture fixing nails, the self-locking arc-shaped nail comprises a middle connecting end comprising a plurality of connecting joints, the axial head and tail ends of the connecting joints are respectively provided with a hinge shaft and a hinge hole, and the connecting joints are axially provided with wire passing holes in a penetrating manner; the arc screw thread end is connected with one end of the middle connecting end, and threads are arranged on the peripheral surface of the arc screw thread end; the front-end outer sleeve is connected with the other end of the middle connecting end, a pull wire is arranged in the front-end outer sleeve, one end of the pull wire is connected with an inner shrinkage pipe arranged in the front-end outer sleeve, the other end of the pull wire penetrates through a wire passing hole of the connecting joint to be connected with the threaded end of the arc screw, and the inner shrinkage pipe is matched with the front-end outer sleeve; according to the self-locking arc-shaped nail, the whole arc-shaped nail is driven by the thread end of the arc-shaped nail to rotate and advance along the arc-shaped nail channel, after the arc-shaped nail reaches a preset position, the thread and the front-end outer sleeve lock and fix a pull wire, and finally the arc-shaped nail is bent, locked and fixed along the arc-shaped channel.

Description

Technical Field

[0001] The invention belongs to the field of fracture fixation nails, and more specifically, relates to a self-locking arc nail. Background Art

[0002] After the pelvic fracture is reduced, the reduced pelvis needs to be fixed. Since the pelvic structure is curved and irregular in shape, traditional built-in linear bone screws may penetrate the pelvis during drilling, reducing the fixation effect or making fixation difficult. To solve this problem, a bone screw that can deform freely and be embedded in the pelvic cortical bone along an arc channel is needed to solve the problem of improving reliable fixation after pelvic reduction. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide a self-locking arc nail, which drives the arc nail as a whole to rotate and advance along the arc nail channel through the threaded end of the arc nail. After reaching the predetermined position, the thread and the front end outer sleeve lock and fix the traction line, thereby finally realizing the bending and locking fixation of the arc nail along the arc channel.

[0004] In order to achieve the above object, the present invention provides a self-locking arc nail, comprising:

[0005] The middle connecting end includes a plurality of connecting sections, wherein the connecting sections are respectively provided with hinge shafts and hinge holes at the axial ends thereof, wherein the setting directions of the hinge shafts and the hinge holes are perpendicular to each other, and the connecting sections are provided with wire holes through the axial direction, wherein the ends of all the connecting sections are sequentially connected to form the middle connecting end, and the wire holes of each connecting section in the middle connecting end are correspondingly provided;

[0006] An arc screw threaded end connected to one end of the middle connecting end, wherein the outer peripheral surface of the arc screw threaded end is provided with threads;

[0007] The front end outer sleeve is connected to the other end of the middle connecting end. A traction line is arranged inside the front end outer sleeve. One end of the traction line is connected to an inner shrinkage tube arranged inside the front end outer sleeve. The other end of the traction line passes through the wire hole of the connecting section and is connected to the threaded end of the arc screw. The inner shrinkage tube cooperates with the front end outer sleeve.

[0008] Optionally, two hinge shafts are correspondingly arranged on an end surface of one end of the connecting joint, and the hinge shaft comprises a round head portion and a connecting portion, and the round head portion is connected to the end surface of the connecting joint via the connecting portion.

[0009] Optionally, a hinge hole is centrally opened on the other end face of the connecting joint, and both ends of the hinge hole are connected to the outside of the connecting joint. The hinge hole includes a circular hole portion and a strip hole portion, and the circular hole portion is connected to the outside of the end face of the connecting joint through the strip hole portion. The circular hole portion is rotatably matched with the round head portion, and the axial length of the connecting portion is greater than the axial length of the strip hole portion.

[0010] Optionally, four wire passing holes are evenly arranged on the connecting joint, and the traction wire is arranged in each of the wire passing holes.

[0011] Optionally, a connecting hole is provided at the end of the threaded end of the arc screw, and the connecting hole is snap-fitted with the hinge shaft.

[0012] Optionally, a connecting block is provided at one end of the front outer sleeve, and the connecting block is snap-fitted with the hinge hole.

[0013] Optionally, a plurality of locking blocks are arranged at intervals along the circumferential direction at the other end of the front outer sleeve, and locking holes are formed between adjacent locking blocks.

[0014] Optionally, a threaded section is provided at one end of the inner tightening tube, and the end of the threaded section close to the locking hole is connected to the traction line. A pin hole is provided at the other end of the inner tightening tube, and a detachable pin is provided on the pin hole. Both ends of the pin are snap-fitted with the locking hole.

[0015] Optionally, a hexagonal hole is provided in the middle of the other end of the inner tightening tube.

[0016] Optionally, the traction wire is a metal wire.

[0017] The present invention provides a self-locking arc nail, which has the beneficial effect that: the arc nail connects multiple connecting sections in a hinged form, so that the middle part of the arc nail can be rotated freely, and can rotate and advance along a curved path in an arc channel. After reaching a preset position, the metal wire is tightened by rotating an inner locking tube, so that the fixation of the arc nail in a bent state can be completed, which better adapts to the fixation requirements after pelvic fracture reduction, is more in line with the actual situation of an irregular pelvic shape, and can also reduce trauma, avoid penetrating cortical bone, and reduce the difficulty of planning the insertion path of the bone nail.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0020] Figure 1 A schematic structural diagram of a self-locking arc-shaped nail according to an embodiment of the present invention is shown.

[0021] Figure 2 Shows Figure 1 AA section view.

[0022] Figure 3 Shows Figure 1 BB section view.

[0023] Figure 4 Shows Figure 3 Enlarged view of point C.

[0024] Figure 5 Shows Figure 4 DD section view.

[0025] Figure 6 A schematic structural diagram of a connection joint according to an embodiment of the present invention is shown.

[0026] Description of reference numerals:

[0027] 1. Connecting joint; 101. Articulated shaft; 102. Articulated hole; 103. Wire hole; 104. Round head; 105. Connecting part; 2. Arc screw threaded end; 3. Front outer sleeve; 301. Locking block; 302. Locking hole; 4. Metal wire; 5. Internal tightening tube; 501. Pin; 502. Hexagon socket hole. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0029] The present invention provides a self-locking arc nail, comprising:

[0030] The middle connecting end includes a plurality of connecting sections, and the connecting sections are respectively provided with hinge shafts and hinge holes at the axial ends thereof, and the setting directions of the hinge shafts and hinge holes are perpendicular to each other. The connecting sections are provided with wire holes through the axial direction, and all the connecting sections are connected in sequence from head to tail to form the middle connecting end, and the wire holes of each connecting section in the middle connecting end are correspondingly provided;

[0031] The arc screw thread end is connected to one end of the middle connection end, and the outer peripheral surface of the arc screw thread end is provided with threads;

[0032] The front end outer sleeve is connected to the other end of the middle connecting end. A traction line is arranged inside the front end outer sleeve. One end of the traction line is connected to the inner shrinkage tube arranged inside the front end outer sleeve. The other end of the traction line passes through the wire hole of the connecting section and is connected to the threaded end of the arc screw. The inner shrinkage tube cooperates with the front end outer sleeve.

[0033] Specifically, the arc nail is provided with an arc screw threaded end, a middle connecting end and a front end outer sleeve in sequence according to the order of implantation at the fracture site. The arc screw threaded end can be screwed into the repositioned bone through the thread. Since the middle connecting end has multiple connecting joints hingedly connected, the connecting joints can bend and deform along with the arc nail channel. When the arc nail is fixed in place, the traction line can be tightened by rotating the inner tightening tube. In this way, the gap between the connecting joints is eliminated, and the entire arc nail can be bent, locked and fixed in the arc channel. Finally, the front outer sleeve and the inner tightening tube are relatively fixed, and the entire arc nail is implanted.

[0034] Optionally, two hinge shafts are correspondingly arranged on one end surface of the connecting joint, and the hinge shaft comprises a round head portion and a connecting portion, and the round head portion is connected to the end surface of the connecting joint via the connecting portion.

[0035] Optionally, a hinge hole is centrally opened on the other end face of the connecting joint, and both ends of the hinge hole are connected to the outside of the connecting joint. The hinge hole includes a circular hole portion and a strip hole portion. The circular hole portion is connected to the outside of the end face of the connecting joint through the strip hole portion, and the circular hole portion is rotatably matched with the round head portion, and the axial length of the connecting portion is greater than the axial length of the strip hole portion.

[0036] Optionally, four wire passing holes are evenly arranged on the connecting joint, and a traction wire is arranged in each wire passing hole.

[0037] Specifically, for the connecting section connected end to end, since there are gaps between the round head portion and the round hole portion and between the connecting portion and the strip hole portion, the hinge axis of one adjacent connecting section and the hinge hole of another connecting section can be relatively bent and adjusted. In addition, the setting direction of the hinge axis and the setting direction of the hinge hole are perpendicular to each other, so that the connecting section can be bent in any direction, and traction lines are respectively passed through the four wire holes, so as to ensure that the hinge hole and the hinge axis will not be separated.

[0038] Optionally, a connecting hole is provided at the end of the threaded end of the arc screw, and the connecting hole is snap-fitted with the hinge shaft.

[0039] Optionally, a connecting block is provided at one end of the front outer sleeve, and the connecting block is snap-fitted with the hinge hole.

[0040] Specifically, connecting holes and connecting blocks are respectively provided on the threaded end of the arc screw and the front end outer sleeve, so that the threaded end of the arc screw and the front end outer sleeve can also achieve relative bending adjustment with the middle connecting end, and the arc nail is formed into a whole through a snap connection, which facilitates moving the arc nail to the fracture site when the threaded end of the arc screw is screwed in.

[0041] Optionally, a plurality of locking blocks are arranged at intervals along the circumferential direction at the other end of the front outer sleeve, and locking holes are formed between adjacent locking blocks.

[0042] Optionally, a threaded section is provided at one end of the inner tightening tube, and the end of the threaded section close to the locking hole is connected to the traction line. A pin hole is provided at the other end of the inner tightening tube, and a detachable pin is provided on the pin hole. Both ends of the pin are snap-fitted with the locking hole.

[0043] Optionally, a hexagonal hole is provided in the middle of the other end of the inner shrink tube.

[0044] Optionally, the traction wire is a metal wire.

[0045] Specifically, when the arc nail moves to the specified position, the inner tightening tube can be driven to rotate by the hex wrench, so that the metal wire can be wrapped around the threaded section, so that the metal wire in the middle connecting end is interfered with to tighten the gap between the connecting sections, and the relative positions between the connecting sections are fixed. When the inner tightening tube cannot rotate, it proves that the arc nail is bent and locked, and a pin can be inserted into the inner tightening tube, and the pin is simultaneously engaged with the locking hole.

[0046] Example

[0047] like Figures 1 to 6 As shown, the present invention provides a self-locking arc nail, comprising:

[0048] The middle connection end includes a plurality of connection sections 1, and the connection sections 1 are respectively provided with hinge shafts 101 and hinge holes 102 at the axial ends thereof, and the setting directions of the hinge shafts 101 and the hinge holes 102 are perpendicular to each other, and the connection sections 1 are provided with wire holes 103 along the axial direction, and all the connection sections 1 are connected in sequence from head to tail to form the middle connection end, and the wire holes 103 of each connection section 1 in the middle connection end are correspondingly arranged;

[0049] The arc screw thread end 2 is connected to one end of the middle connection end, and the outer peripheral surface of the arc screw thread end 2 is provided with threads;

[0050] The front end outer sleeve 3 is connected to the other end of the middle connecting end. A metal wire 4 is arranged inside the front end outer sleeve 3. One end of the metal wire 4 is connected to an inner shrink tube 5 arranged inside the front end outer sleeve 3. The other end of the metal wire 4 passes through the wire hole 103 of the connecting section 1 and is connected to the arc screw threaded end 2. The inner shrink tube 5 cooperates with the front end outer sleeve 3.

[0051] In this embodiment, two hinge shafts 101 are correspondingly arranged on one end surface of the connection section 1 . The hinge shaft 101 includes a round head portion 104 and a connecting portion 105 . The round head portion 104 is connected to the end surface of the connection section 1 via the connecting portion 105 .

[0052] In this embodiment, a hinge hole 102 is centrally opened on the other end face of the connecting joint 1, and both ends of the hinge hole 102 are connected to the outside of the connecting joint 1. The hinge hole 102 includes a circular hole portion and a strip hole portion. The circular hole portion is connected to the outside of the end face of the connecting joint 1 through the strip hole portion, and the circular hole portion is rotatably matched with the round head portion 104. The axial length of the connecting portion 105 is greater than the axial length of the strip hole portion.

[0053] In this embodiment, four wire passing holes 103 are evenly arranged on the connecting joint 1 , and a metal wire 4 is arranged in each wire passing hole 103 .

[0054] In this embodiment, a connecting hole is provided at the end of the arc screw thread end 2 , and the connecting hole is snap-fitted with the hinge shaft 101 .

[0055] In this embodiment, a connecting block is provided at one end of the front outer sleeve 3 , and the connecting block is snap-fitted with the hinge hole 102 .

[0056] In this embodiment, a plurality of locking blocks 301 are arranged at intervals along the circumferential direction at the other end of the front outer sleeve 3 , and locking holes 302 are formed between adjacent locking blocks 301 .

[0057] In this embodiment, a threaded section is provided at one end of the inner tightening tube 5, and one end of the threaded section close to the locking hole 302 is connected to the metal wire 4. A pin hole is provided at the other end of the inner tightening tube 5, and a detachable pin 501 is provided on the pin hole. Both ends of the pin 501 are snap-fitted with the locking hole 302.

[0058] In this embodiment, a hexagonal hole 502 is provided in the middle of the other end of the inner tightening tube 5 .

[0059] In summary, when the arc nail is used to fix the repositioned pelvis, the arc screw threaded end 2 is first screwed in to advance along the pre-planned arc channel, driving the connecting section 1 and the front end outer sleeve 3 of the arc nail to enter along the arc channel. The front end outer sleeve 3 and the arc nail threaded end 2 form an axial compression force along the arc nail body to tighten the broken pelvis. When the arc screw threaded end 2 reaches the planned position, the inner tightening tube 5 is rotated to achieve interference compression of the metal rope 4 to achieve curved fixation of the arc nail.

[0060] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A self-locking arc nail, characterized in that: include: The middle connecting end includes a plurality of connecting sections, wherein the connecting sections are respectively provided with hinge shafts and hinge holes at the axial ends thereof, wherein the setting directions of the hinge shafts and the hinge holes are perpendicular to each other, and the connecting sections are provided with wire holes through the axial direction, wherein the ends of all the connecting sections are sequentially connected to form the middle connecting end, and the wire holes of each connecting section in the middle connecting end are correspondingly provided; An arc screw threaded end connected to one end of the middle connecting end, wherein the outer peripheral surface of the arc screw threaded end is provided with threads; The front end outer sleeve is connected to the other end of the middle connecting end. A traction line is arranged inside the front end outer sleeve. One end of the traction line is connected to an inner shrinkage tube arranged inside the front end outer sleeve. The other end of the traction line passes through the wire hole of the connecting section and is connected to the threaded end of the arc screw. The inner shrinkage tube cooperates with the front end outer sleeve.

2. The self-locking arc nail according to claim 1, characterized in that: Two hinge shafts are correspondingly arranged on one end surface of the connection joint, and the hinge shaft comprises a round head portion and a connection portion, and the round head portion is connected to the end surface of the connection joint through the connection portion.

3. The self-locking arc nail according to claim 2, characterized in that: A hinge hole is centrally opened on the other end face of the connecting joint, and both ends of the hinge hole are connected to the outside of the connecting joint. The hinge hole includes a circular hole portion and a strip hole portion. The circular hole portion is connected to the outside of the end face of the connecting joint through the strip hole portion. The circular hole portion is rotatably matched with the round head portion, and the axial length of the connecting portion is greater than the axial length of the strip hole portion.

4. The self-locking arc nail according to claim 3, characterized in that: Four wire-passing holes are evenly arranged on the connecting joint, and the traction wire is arranged in each of the wire-passing holes.

5. The self-locking arc nail according to claim 1, characterized in that: The end of the arc screw thread end is provided with a connecting hole, and the connecting hole is engaged with the hinge shaft.

6. The self-locking arc nail according to claim 1, characterized in that: A connecting block is provided at one end of the front end outer sleeve, and the connecting block is snap-fitted with the hinge hole.

7. The self-locking arc nail according to claim 6, characterized in that: The other end of the front end outer sleeve is provided with a plurality of locking blocks at intervals along the circumferential direction, and locking holes are formed between adjacent locking blocks.

8. The self-locking arc nail according to claim 7, characterized in that: A threaded section is provided at one end of the inner tightening tube, and an end of the threaded section close to the locking hole is connected to the traction line. A pin hole is provided at the other end of the inner tightening tube, and a detachable pin is provided on the pin hole. Both ends of the pin are snap-fitted with the locking hole.

9. The self-locking arc nail according to claim 8, characterized in that: A hexagonal hole is arranged in the middle of the other end of the inner shrink tube.

10. The self-locking arc nail according to claim 1, characterized in that: The traction wire is a metal wire.

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