Elastic intramedullary nail

Abstract

The present invention relates to the technical field of medical devices, and discloses an elastic intramedullary nail, including a nail head, a drawstring, a connector 1, a connector 2, a splicing clamp 1, a splicing interface 1, a splicing clamp 2, a splicing interface 2, a connecting block, a cylinder, a fixed block, a sliding block, a rotating block, a groove 1, a groove 2, an elastic telescopic device, a clamping block, a sliding groove, an opening, a clamping ring, a clamping groove, a socket 1, a socket 2 and an insertion rod. The present invention forms a nail body by arranging a plurality of connectors 1 and 2 that can be movably spliced, and a plurality of staggered connectors 1 and 2 are staggeredly connected by a splicing mechanism 1 and a splicing mechanism 2, so that the nail body can be bent in any direction and can achieve multiple bends, that is, it has flexibility, which is convenient for inserting into the medullary cavity at both ends of the fracture without completing the reduction after the fracture, and then the nail body is changed from flexible to rigid by tightening the fixed drawstring, so as to achieve the effect of fracture reduction and fixation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and more particularly to an elastic intramedullary nail. Background Art

[0002] Intramedullary nails are long implants placed in the medullary cavity for the purpose of fracture fixation after fracture. Compared with ordinary bone plates, intramedullary nails do not require much periosteum to be stripped when fixing broken bones, and the nails can be inserted through a very small entrance, thereby protecting the blood circulation of the bone. Intramedullary nails are easy to operate and cause less damage to the patient. Medullary expansion is usually required before inserting the intramedullary nail, and the bone chips produced during the expansion process can also accelerate bone healing.

[0003] However, traditional intramedullary nails must be reduced before they can be inserted and locked in the medullary cavity. For complex displaced fractures, reduction is difficult. Therefore, for long bone fractures that are difficult to reduce, the actual application of traditional intramedullary nails is very difficult.

[0004] Therefore, there is an urgent need to design an elastic intramedullary nail that can solve the above technical problems. Summary of the invention

[0005] In order to overcome the above-mentioned defects existing in the prior art, the present invention provides an elastic intramedullary nail, which comprises a plurality of movably spliced ​​connecting members 1 and 2 to form a nail body, wherein the plurality of staggered connecting members 1 and 2 are staggeredly connected by splicing mechanisms 1 and 2, so that the nail body can be bent in any direction and can achieve multiple bends, i.e., the nail body has flexibility, which facilitates the insertion into the medullary cavity at both ends of the fracture without completing reduction after the fracture, and then the nail body is changed from flexible to rigid by tightening a fixed pull rope, thereby achieving the effect of fracture reduction and fixation.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an elastic intramedullary nail, comprising a nail body, a nail head and a nail tail, one end of the nail body is fixedly connected to the nail head, the other end of the nail body is fixedly connected to the nail tail, a pull rope passing through the nail body is arranged between the nail head and the nail tail, the nail body is composed of a plurality of connecting pieces 1 and a plurality of connecting pieces 2 staggered together, both the connecting pieces 1 and the connecting pieces 2 are columnar, a splicing mechanism 1 and a splicing mechanism 2 are staggered between the plurality of connecting pieces 1 and the plurality of connecting pieces 2, the splicing mechanism 1 comprises A splicing card 1 is arranged at one end of the connecting piece 1 close to the nail head and a splicing interface 1 is arranged at one end of the adjacent connecting piece 2 close to the nail tail, and the splicing card 1 is snap-connected with the splicing interface 1; the splicing mechanism 2 includes a splicing card 2 arranged at one end of the connecting piece 2 close to the nail head and a splicing interface 2 arranged at one end of the adjacent connecting piece 1 close to the nail tail, and the splicing card 2 is snap-connected with the splicing interface 2; the splicing card 1 includes a connecting block and a cylinder, the cylinder is arranged at one end of the connecting block away from the connecting piece 1 and is integrally connected to the connecting block, and the splicing card 2 is composed of The splicing card piece 1 is rotated 90 degrees around the central axis of the connecting piece 1; the nail tail includes a fixed block, a sliding block and a rotating block, the fixed block is connected to the nail body, the sliding block is arranged at the end of the fixed block away from the nail body, a groove 1 is arranged on the side of the fixed block facing the sliding block, a groove 2 connected to the groove 1 is arranged on the side of the sliding block facing the fixed block, and an elastic telescopic device is arranged between the bottom of the groove 1 and the bottom of the groove 2; a card block is arranged on the end of the sliding block close to the fixed block, and the fixed block is provided with a sliding groove for the card block to be inserted; the rotating block is arranged at the end of the sliding block away from the sliding block At one end of the fixed block, an opening is provided on a side of the sliding block away from the fixed block, a snap ring is provided in the opening, the snap ring is provided at the end of the opening away from the fixed block, a slot is provided on the side wall of the rotating block for the snap ring to be inserted into, the pull rope passes through the fixed block and the sliding block and is fixedly connected to the rotating block; two sockets 1 are provided on a side of the rotating block away from the sliding block, the snap ring is provided with two sockets 2 passing through the thickness direction of the snap ring, the two sockets 1 are respectively connected to the corresponding sockets 2, and one of the sockets 1 is provided with a rod passing through the sockets 1 and 2.

[0007] By adopting the above technical solution, the splicing card 1 is clamped in the splicing interface 1 and a gap is left, so that displacement can occur between the connecting block 1 and the connecting block 2, so that the nail body can be bent in any direction, and multiple connecting blocks 1 and 2 are provided, so that the nail body can achieve multiple bends, that is, it has flexibility, and by providing a pull rope, when not in use, the pull rope is slightly longer than the nail body, so that the nail body will not be affected by the pull rope when it is bent, and when the sliding block is pulled away from the fixed block, it is stretched and tightened, and the nail body becomes straight from being bent. After the sliding block is reset, the rotating block is rotated to keep the pull rope in a taut state, and the nail body has rigidity, thereby achieving reduction and fixation of the fracture site.

[0008] Furthermore, the cross section of the connecting block is trapezoidal.

[0009] By adopting the above technical solution, when the nail body is bent, that is, one end of the open side of the splicing interface is close to the far end of the connecting block, when the rotating block is rotated, the two adjacent connecting parts will not rotate relative to each other due to the force of the pull rope, thereby improving the stability of the nail body after it changes from soft to hard.

[0010] Furthermore, four pull ropes are provided and the four pull ropes are arranged rotationally symmetrically.

[0011] By adopting the above technical solution, the efficiency of rotating the rotating block to pull the pull rope to make the nail body straighten from bending can be increased.

[0012] Furthermore, the two jacks are symmetrically arranged.

[0013] By adopting the above technical solution, the two sockets are symmetrically arranged, and the rotating block is fixed to the other socket by the insertion rod after rotating 180 degrees. At this time, the rotation of the rotating block exerts the maximum pulling force on the pull rope, which can effectively improve the rigidity of the nail body.

[0014] In summary, the present invention has the following beneficial effects: the present invention forms a nail body by arranging a plurality of movably spliced ​​connecting members 1 and 2, and the plurality of staggered connecting members 1 and 2 are staggeredly connected by splicing mechanisms 1 and 2, so that the nail body can be bent in any direction and can achieve multiple bends, that is, it has flexibility, which is convenient for inserting into the medullary cavity at both ends of the fracture without completing reduction after the fracture, and then the nail body is changed from flexible to rigid by tightening the fixed pull rope, thereby achieving the effect of fracture reduction and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view of an intramedullary nail in an embodiment of the present invention;

[0016] Figure 2 is a structural diagram of a front view of an intramedullary nail in an embodiment of the present invention;

[0017] Figure 3 is a structural diagram of a top view of an intramedullary nail in an embodiment of the present invention;

[0018] Figure 4 It is a structural diagram of the front view of the joint of the first connecting member and the second connecting member in an embodiment of the present invention;

[0019] Figure 5 It is a structural diagram of a top view of the joint of the first connecting member and the second connecting member in an embodiment of the present invention;

[0020] Figure 6 is a front view of a nail tail in an embodiment of the present invention;

[0021] Figure 7 is a structural diagram of a front view of a nail tail in an embodiment of the present invention;

[0022] In the figure: 1. nail head; 2. pull rope; 3. connector 1; 4. connector 2; 5. splicing card 1; 6. splicing interface 1; 7. splicing card 2; 8. splicing interface 2; 9. connecting block; 10. cylinder; 11. fixed block; 12. sliding block; 13. rotating block; 14. slot 1; 15. slot 2; 16. elastic telescopic device; 17. block; 18. slide slot; 19. opening; 20. snap ring; 21. slot; 22. socket 1; 23. socket 2; 24. plug rod. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-7 The present invention is described in further detail.

[0024] Embodiment: An elastic intramedullary nail, such as Figures 1 to 7 As shown, it includes a nail body, a nail head 1 and a nail tail, one end of the nail body is fixedly connected to the nail head 1, and the other end of the nail body is fixedly connected to the nail tail. A pull rope 2 passing through the nail body is provided between the nail head 1 and the nail tail, and both ends of the pull rope 2 are fixedly connected to the nail head 1 and the nail tail. Four pull ropes 2 are provided and the four pull ropes 2 are rotationally symmetrically arranged.

[0025] The nail body is composed of a plurality of connecting pieces 1 3 and a plurality of connecting pieces 2 4 which are staggered and spliced ​​together. The connecting pieces 1 3 and the connecting pieces 2 4 can be movably spliced ​​together. Both the connecting pieces 1 3 and the connecting pieces 2 4 are column-shaped. A splicing mechanism 1 and a splicing mechanism 2 are staggered between the plurality of connecting pieces 1 3 and the plurality of connecting pieces 2 4. The splicing mechanism 1 includes a splicing clamp 1 5 provided at one end of the connecting piece 1 3 close to the nail head 1 and a splicing interface 1 6 provided at one end of the adjacent connecting piece 2 4 close to the nail tail. The splicing clamp 1 5 is snap-fitted with the splicing interface 1 6 and a certain gap is left in the splicing interface 1 6, so that a certain angle change can be produced between the connecting piece 1 3 and the connecting piece 2 4; the splicing mechanism 2 includes a splicing clamp 2 7 provided at one end of the connecting piece 2 4 close to the nail head 1 and a splicing interface 2 8 provided at one end of the adjacent connecting piece 1 3 close to the nail tail. The splicing clamp 2 7 is snap-fitted with the splicing interface 2 8 and a certain gap is left in the splicing interface 2 8, so that a certain angle change can be produced between the connecting piece 2 4 and the connecting piece 1 3.

[0026] The splicing card 15 includes a connecting block 9 and a cylinder 10. The diameter of the cylinder 10 is greater than the thickness of the connecting block 9. The cross-section of the connecting block 9 is trapezoidal, which can limit the relative rotation between the connecting piece 13 and the connecting piece 24. The cylinder 10 is arranged at the end of the connecting block 9 away from the connecting piece 13 and is integrally connected to the connecting block 9. The splicing card 27 is formed by rotating the splicing card 15 around the central axis of the connecting piece 13 by 90°. With this arrangement, when the pull rope 2 is not pulled, the nail body will not bend downward due to its own gravity after being bent in the horizontal direction.

[0027] The nail tail includes a fixed block 11, a sliding block 12 and a rotating block 13. The fixed block 11 is connected to the nail body. The sliding block 12 is arranged at one end of the fixed block 11 away from the nail body. A groove 14 is arranged on a side of the fixed block 11 facing the sliding block 12. A groove 2 15 connected to the groove 14 is arranged on a side of the sliding block 12 facing the fixed block 11. An elastic telescopic device 16 is arranged between the bottom of the groove 14 and the bottom of the groove 2 15. The elastic telescopic device 16 can be specifically set as a spring, or other means that can realize the elastic telescopic function. Device; a card block 17 is provided at one end of the sliding block 12 close to the fixed block 11, and the fixed block 11 is provided with a slide groove 18 for the card block 17 to be inserted into. When the nail body needs to be straightened from a bend, the slider can be pulled to slide toward the end away from the fixed block 11. After the pull rope 2 is pulled out, the sliding block 12 returns to its original position due to the action of the elastic telescopic device 16, and the pulled out pull rope 2 curls in the opening 19, and when the sliding block 12 is pulled, due to the action of the slide groove 18, the sliding block 12 and the fixed block 11 will not rotate relative to each other.

[0028] The rotating block 13 is arranged at one end of the sliding block 12 away from the fixed block 11, and an opening 19 is provided on one side of the sliding block 12 away from the fixed block 11. A snap ring 20 is fixedly connected in the opening 19. The snap ring 20 is arranged at one end of the opening 19 away from the fixed block 11. The side wall of the rotating block 13 is fixedly connected with a slot 21 for the snap ring 20 to be inserted into. The pull rope 2 passes through the fixed block 11 and the sliding block 12 and is fixedly connected to the rotating block 13. When the pull rope 2 needs to be tightened, the rotating block 13 can be rotated. Since the pull rope 2 is fixedly connected to the rotating block 13, when the rotating block 13 rotates 180°, the pull rope 2 is tightened, and the nail body becomes straight and rigid.

[0029] Two insertion holes 22 are provided on a side of the rotating block 13 facing away from the sliding block 12, and the two insertion holes 22 are symmetrically arranged. The snap ring 20 is provided with two insertion holes 23 passing through the thickness direction of the snap ring 20. The two insertion holes 22 are respectively connected to the corresponding insertion holes 23. One of the insertion holes 22 is provided with an insertion rod 24 passing through the insertion holes 1 22 and the insertion holes 23. When the insertion rod 24 is inserted into the insertion holes 1 22 and the insertion holes 23, the rotating block 13 can be fixed.

[0030] Working principle: When in use, first make the nail body of the intramedullary nail in a bendable state, that is, before the rotating block 13 rotates, and then extend the intramedullary nail from one end of the fracture, along the medullary cavity to the fracture. Due to its flexibility, the intramedullary nail can continue to extend into the other end of the fracture, and then fix the nail tail and the nail head 1 to the two ends of the fracture respectively, and tighten the pull rope 2 by pulling the sliding block 12. At this time, the nail body of the intramedullary nail changes from bending to straight, driving the fracture to be reset. Then, after the sliding block 12 is reset under the action of the elastic telescopic device 16, the insertion rod 24 is pulled out, and the rotating block 13 is rotated 180° and inserted into the original socket 1 22 and socket 2 23. At this time, the pull rope 2 is tightened, and the rotating block 13 no longer rotates. At this time, the intramedullary nail has rigidity and can fix the fracture.

[0031] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An elastic intramedullary nail, characterized in that: The nail body comprises a nail body, a nail head (1) and a nail tail, wherein one end of the nail body is fixedly connected to the nail head (1), and the other end of the nail body is fixedly connected to the nail tail, a pull rope (2) passing through the nail body is arranged between the nail head (1) and the nail tail, and the nail body is composed of a plurality of connecting pieces (3) and a plurality of connecting pieces (4) staggered together, wherein the connecting pieces (3) and the connecting pieces (4) are both columnar, and a splicing mechanism (1) and a splicing mechanism (2) are staggered between the plurality of connecting pieces (3) and the plurality of connecting pieces (4), wherein the splicing mechanism (1) comprises a splicing clamp (5) arranged at one end of the connecting piece (3) close to the nail head (1) and a splicing clamp (5) arranged at an adjacent connecting piece (4) close to the nail tail The first splicing mechanism comprises a second splicing clamp (7) provided at one end of the second connecting member (4) close to the nail head (1) and a second splicing clamp (8) provided at one end of the adjacent first connecting member (3) close to the nail tail, the second splicing clamp (7) being snap-fitted with the second splicing clamp (8); the first splicing clamp (5) comprises a connecting block (9) and a cylinder (10), the cross section of the connecting block (9) being trapezoidal, the cylinder (10) being provided at one end of the connecting block (9) away from the first connecting member (3) and being integrally connected to the connecting block (9), the second splicing clamp (7) being composed of a splicing clamp The nail tail comprises a fixed block (11), a sliding block (12) and a rotating block (13); the fixed block (11) is connected to the nail body; the sliding block (12) is arranged at an end of the fixed block (11) away from the nail body; a groove (14) is arranged on a side of the fixed block (11) facing the sliding block (12); a groove (15) connected to the groove (14) is arranged on a side of the sliding block (12) facing the fixed block (11); an elastic telescopic device (16) is arranged between the bottom of the groove (14) and the bottom of the groove (15); the sliding block (12) is close to the fixed block (11) and is arranged on a side of the sliding block (12) facing the fixed block (11). 1) is provided with a clamping block (17) at one end, and the fixed block (11) is provided with a sliding groove (18) for the clamping block (17) to be clamped in; the rotating block (13) is provided at the end of the sliding block (12) away from the fixed block (11), and the side of the sliding block (12) away from the fixed block (11) is provided with an opening (19), and a clamping ring (20) is provided in the opening (19), and the clamping ring (20) is provided at the end of the opening (19) away from the fixed block (11), and a clamping groove (21) for the clamping ring (20) to be clamped in the side wall of the rotating block (13), and the pull rope (2) passes through the fixed block (11) and the sliding block (12) and is fixedly connected to the rotating block (13);The rotating block (13) is provided with two first insertion holes (22) on a side facing away from the sliding block (12), the two first insertion holes (22) are symmetrically arranged, the snap ring (20) is provided with two second insertion holes (23) passing through the thickness direction of the snap ring (20), the two first insertion holes (22) are respectively connected to the corresponding second insertion holes (23), and one of the first insertion holes (22) is provided with an insertion rod (24) passing through the first insertion hole (22) and the second insertion hole (23). ; 2. The elastic intramedullary nail according to claim 1, characterized in that: The pull ropes (2) are provided with four and the four pull ropes (2) are arranged rotationally symmetrically.

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