Asymmetric arm straddle nail

Abstract

The invention relates to a straddle nail with asymmetric arms. The straddle nail comprises a nail beam (1) made of shape memory alloy, a long nail arm (2) and a short nail arm (3), the long nail arm (2) and the short nail arm (3) are arranged at the two ends of the nail beam (1) respectively, the long nail arm (2) and the short nail arm (3) face each other to form an angle, and fixing teeth (4) are arranged on the long nail arm (2) and the short nail arm (3). Compared with the prior art, the screw structure has the advantages that fixation is firm, the screw structure is attached to the orthopedic bone surface, three-point (or multi-point) clamping is more stable, irritation caused by screw retreating after the screw structure is used can be avoided, the bone burst condition caused in the process that the screw structure is screwed into the bone substance is also avoided, intraoperative measurement is not needed, and the operation is convenient. And whether the screw is too long to enter the articular surface is not required, and the installation is simple and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an asymmetric arm suture nail. BACKGROUND

[0002] Hallux valgus is a common forefoot deformity with a high incidence, which affects shoe-wearing and walking. There are many surgical treatment methods for hallux valgus, but problems such as recurrence, metatarsal head necrosis, metatarsal head pain, internal fixation irritation of prominent subcutaneous tissue, and discomfort in wearing shoes are common. Common hallux valgus osteotomy surgery (Chevron, Scarf, Ludloff, Akin, etc.) usually requires screw fixation, and the postoperative fixation is not firm, and even some doctors still use plaster fixation after surgery. However, due to the small bone mass in the foot, the fixation is unstable, and there may be conditions such as osteoporosis, thin skin, and lack of fat, so using screw fixation to fix the osteotomy block often causes the bone block to burst when the screw is twisted in, the screw tail irritates the skin when the screw is withdrawn, and the fracture block is displaced after single screw fixation, which affects the treatment effect, causes discomfort in wearing shoes, affects the patient's feelings, and even causes deformity healing. SUMMARY

[0003] The purpose of the present application is to provide an asymmetric arm suture nail to avoid the irritation caused by screw withdrawal after use.

[0004] The purpose of the present application can be achieved by the following technical solution: an asymmetric arm suture nail, comprising a nail beam made of shape memory alloy, a long nail arm, and a short nail arm.

[0005] The long nail arm and the short nail arm are respectively arranged at both ends of the nail beam, the long nail arm and the short nail arm are angled towards each other, and the long nail arm and the short nail arm are each provided with a fixing tooth.

[0006] Preferably, the angle between the long nail arm and the short nail arm and the beam length are suitable for the elastic recovery of the shape memory alloy to fix the osteotomy bone block.

[0007] Preferably, the nail beam is of a non-linear type.

[0008] Further preferably, the nail beam is of an M-wave shape or a C shape, which fits the bone surface after osteotomy correction.

[0009] More preferably, the nail beam is of an M-wave shape, and the long nail arm and the short nail arm are fixed at the wedge-shaped osteotomy of the phalanx through the fixing tooth.

[0010] Preferably, the long nail arm is fixed at the proximal end of the wedge-shaped osteotomy of the phalanx through the fixing tooth, and the short nail arm is fixed at the distal end of the wedge-shaped osteotomy of the phalanx through the fixing tooth.

[0011] Preferably, the phalanx is the proximal phalanx.

[0012] Further preferably, the phalanx is the proximal phalanx of the first toe.

[0013] Still further preferably, the nail beam is C-shaped, and the long nail arm and the short nail arm are fixed at the metatarsal shaft Z-shaped osteotomy by the fixing teeth.

[0014] Preferably, the long nail arm is fixed at the distal side of the metatarsal shaft Z-shaped osteotomy by the fixing teeth, and the short nail arm is fixed at the proximal side (from inside to outside) of the metatarsal shaft Z-shaped osteotomy by the fixing teeth.

[0015] Further preferably, the long nail arm is fixed at the distal end of the osteotomy metatarsal shaft by the fixing teeth.

[0016] Further preferably, the metatarsal shaft is the first metatarsal shaft.

[0017] Preferably, the long nail arm is provided with a plurality of bifurcated arms at one end away from the nail beam, and the bifurcated arms are each provided with a fixing tooth.

[0018] Further preferably, the long nail arm is provided with two bifurcated arms at one end away from the nail beam.

[0019] Preferably, stress (inverted) teeth are arranged between the nail beam and the long nail arm and between the nail beam and the short nail arm.

[0020] Preferably, the fixing teeth comprise a plurality of isosceles triangle teeth arranged in parallel and at equal intervals along the length direction of the nail arm.

[0021] Further preferably, the isosceles triangle teeth are arranged in parallel and at equal intervals along the opposite inner sides of the two nail arms.

[0022] Preferably, the nail beam, the long nail arm and the short nail arm are made of a nickel-titanium shape memory alloy.

[0023] Preferably, the nail beam, the long nail arm and the short nail arm are integrally formed.

[0024] Preferably, the number of fixing teeth on the short nail arm is 2-6.

[0025] Preferably, the number of fixing teeth on the long nail arm is 8-16.

[0026] It should be noted that, in the present application, the proximal end refers to the end close to the heart, the distal end refers to the end away from the heart, the inner side refers to the side close to the middle of the two feet, and the outer side refers to the side away from the middle of the two feet.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. The riding nail of the present application can avoid the irritation caused by the retreat of the screw structure after use, and can also avoid the bone burst caused by the screw structure during screwing into the bone;

[0029] 2. The present application uses the super-elastic principle of shape memory alloy, and is installed on the two ends of the repositioned bone block in the distraction state to be fixed, and can be firmly fixed on the two ends of the bone block by using the super-elastic principle;

[0030] 3. The present application is attached to the orthopedic bone surface, and is clamped more stably to avoid bone fragmentation, bone block displacement, and screw backout, and also avoids the bone burst caused by the screwing into the bone during the operation, reduces the difficulty of the operation, makes the installation easier, and does not need intraoperative measurement and intraoperative fluoroscopy to detect whether the screw is too long to enter the articular surface, so that the operation is simple and efficient, improves the safety of the operation, and reduces the complications;

[0031] 4. The asymmetric arm shape memory alloy riding nail of the present application is more in line with the anatomical characteristics of the repositioned bone block after the orthopedic treatment of the big toe, and the long and short arms have an arc and a flexible acute angle with the cross beam, so that it has the characteristics of wrapping fixation, is stable and reliable, and will not crush the bone;

[0032] 5. The asymmetric arm shape memory alloy riding nail of the present application is more in line with the anatomical characteristics of the metatarsal and phalangeal bone after the osteotomy, and has a number of small teeth at the distal end of the arm, and the long arm on the medial side also has bifurcated double teeth, which can greatly increase the friction and holding force on the lower surface of the metatarsal bone, three-point clamping is more stable, and the characteristics of wrapping fixation are better embodied, and the fixation is more stable;

[0033] 6. After the orthopedic treatment of hallux valgus, the bone of the first metatarsal column is rearranged, and it is more difficult to fix the general bone plate, but using the riding nail of the present application, a rough hole is only needed to be drilled in the metatarsal shaft, and the short arm on one side is fixed in the hole, and the long arm on the other side is stably held on the lower surface of the metatarsal bone, and through the super-elastic mechanism of shape memory alloy, the two arms are distracted, and the fixation is extremely convenient, and such design is more conducive to the operation;

[0034] 7. The riding nail of the present application can better continuously pressurize and promote bone healing by shape and installation design and the use of the super-elastic principle of shape memory alloy. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Fig. 3 is a three-view drawing of the riding nail of the present application;

[0036] Figure 2 Fig. 4 is a working principle diagram (top view, also indicated by solid lines in the bone) of the riding nail of the present application;

[0037] Figure 3 Fig. 5 is a three-view drawing of the riding nail of the present application;

[0038] Figure 4Working principle of the embodiment 4 of the present application Figure 1 (Front view);

[0039] Figure 5 Working principle of the embodiment 4 of the present application Figure 2 (Front view, also shown by solid line in the part inside the bone);

[0040] In the figure: 1 - nail beam, 2 - long nail arm, 21 - bifurcated arm, 3 - short nail arm, 4 - fixed tooth, 5 - stress tooth, a - proximal osteotomy block, b - distal osteotomy block. DETAILED DESCRIPTION

[0041] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments are implemented on the premise of the technical solutions of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0042] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] All the terms used in the present application (including technical terms or scientific terms) have the same meaning as understood by the ordinary skilled person in the field to which the present application belongs, unless otherwise specifically defined. The accompanying drawings are only for illustrating the structure and working principle of the present application, and are structural schematic diagrams, not surgical states.

[0044] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0045] Embodiment 1

[0046] An asymmetric arm shape memory staple made of shape memory alloy, comprising a nail beam 1, a long nail arm 2 and a short nail arm 3, the length of the long nail arm 2 is greater than that of the short nail arm 3. Among them, the long nail arm 2 and the short nail arm 3 are respectively arranged at both ends of the nail beam 1, and are angled towards each other, and fixed teeth 4 are arranged on the long nail arm 2 and the short nail arm 3.

[0047] Embodiment 2

[0048] An asymmetric arm shape memory staple for fixing bone blocks of foot metatarsal (toe) osteotomy, comprising a nail beam 1, a long nail arm 2 and a short nail arm 3, the long nail arm 2 and the short nail arm 3 are respectively arranged at both ends of the same side of the nail beam 1 and are arranged at an angle with the nail beam 1, and fixed teeth 4 are arranged on the inner sides opposite to each other of the long nail arm 2 and the short nail arm 3.

[0049] When the toe bone model is fixed by using the saddle nail of the embodiment, after the wedge osteotomy of the toe bone is fixed, the long and short arms are inserted, the long arm is fixed at the proximal end of the osteotomy, and the short arm is fixed at the distal end of the osteotomy.

[0050] When the metatarsal bone model is fixed by using the saddle nail of the embodiment, after the Z-shaped osteotomy of the metatarsal bone is performed, the force line of the first metatarsal bone is corrected, the osteotomy blocks at the upper and lower ends are repositioned, the proximal end is fixed by punching a hole in the internal cavity of the metatarsal bone, and the distal end is fixed on the metatarsal side of the lower surface of the osteotomy distal end block. The shape is that one arm is short and one arm is long.

[0051] Embodiment 3

[0052] An asymmetric arm shape memory alloy saddle nail for fixing toe bone wedge osteotomy, as shown in Figure 1 , includes a nail beam 1 in the shape of an M wave, and long and short nail arms 2 and 3 arranged at both ends of the nail beam 1, the long and short nail arms 2 and 3 are at an acute angle towards each other, and a fixing tooth 4 is arranged on the opposite inner side of the nail arms 2 and 3.

[0053] The saddle nail of the embodiment can be used to fix the osteotomized toe bone in the Akin osteotomy surgery, as shown in Figure 2 , after the Akin osteotomy of the proximal phalanx is performed, holes are punched at the proximal and distal ends of the osteotomy according to the beam distance, and appropriate size toe bone asymmetric shape memory alloy saddle nails are installed, the long nail arm 2 is fixed to the proximal osteotomy block a of the toe bone, and the short nail arm 3 is fixed to the distal osteotomy block b, and the nail is tapped to be stable.

[0054] The design of the asymmetric arm saddle nail of the embodiment is more conducive to installation, and can reduce the surgical incision, and has a wave-shaped crossbeam, which is more in line with the anatomical features of the bone on the medial side of the proximal phalanx after osteotomy and reshaping, and has a low surface notch without a nail tail irritation.

[0055] Embodiment 4

[0056] An asymmetric arm shape memory alloy saddle nail for fixing metatarsal Z-shaped osteotomy, as shown in Figure 3 , includes a nail beam 1 in the shape of a C, and long and short nail arms 2 and 3 arranged at both ends of the nail beam 1, the long and short nail arms 2 and 3 are at an acute angle towards each other. In this embodiment, the long nail arm 2 is connected to the nail beam 1 at one end, and two bifurcated arms 21 are arranged at the other end, and a fixing tooth 4 is arranged on the opposite inner side of the bifurcated arms 21 and the short nail arm 3.

[0057] The saddle nail of the embodiment can be used to fix the osteotomized metatarsal bone in a similar Z-shaped osteotomy surgery, as shown in Figures 4-5As shown, after the metatarsal shaft is improved Z-shaped osteotomy, a hole is punched in the proximal metatarsal neck part of the metatarsal shaft, and after the asymmetric shape memory alloy lag screw is expanded, the short pin arm 3 is inserted from inside to outside through the hole, and the long pin arm 2 is fixed to the metatarsal distal osteotomy block b on the medial side, and is tapped to be stable.

[0058] Example 5

[0059] An asymmetric arm shape memory alloy lag screw for fixing metatarsal Z-shaped osteotomy, a stress tooth 5 is added at the transition of the pin beam and the two pin arms, which is used for effective expansion angle when the lag screw is expanded. The rest is the same as example 4.

[0060] This embodiment is a kind of asymmetric arm lag screw for fixing metatarsal shaft osteotomy block, after metatarsal shaft Z-shaped osteotomy, correct the first metatarsal force line, reposition the upper and lower two end osteotomy blocks, proximal is fixed by punching in the metatarsal shaft cavity, distal is fixed on the medial side of the distal bone block, the shape is one arm short and one arm long, there are several small teeth at the end of the arm, and the long arm on the medial side also has bifurcated teeth, which is used to increase the friction and holding force on the medial side of the metatarsal.

[0061] The present application is based on the osteotomy mode and the matching asymmetric arm shape memory lag screw, which can match the orthopedic of hallux valgus, avoid the recurrence of hallux valgus, avoid the irritation of internal fixation, and avoid the loosening and displacement of internal fixation. By adjusting the size, it can adapt to the anatomical characteristics of different sizes of hallux.

[0062] The above description of the embodiments is for the convenience of those skilled in the art to understand and use the invention. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art according to the disclosure of the present application without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. An asymmetric arm saddle stitch, characterized in that, It includes a spike beam (1), a long spike arm (2), and a short spike arm (3) made of shape memory alloy; The long nail arm (2) and the short nail arm (3) are respectively set at both ends of the nail beam (1). The long nail arm (2) and the short nail arm (3) are angled toward each other. Both the long nail arm (2) and the short nail arm (3) are provided with fixing teeth (4).

2. The asymmetric arm saddle stitch according to claim 1, characterized in that, The nail beam (1) is non-linear.

3. The asymmetric arm saddle stitch according to claim 2, characterized in that, The nail beam (1) is M-shaped or C-shaped and fits the bone surface after osteotomy and correction.

4. The asymmetric arm saddle stitch according to claim 3, characterized in that, The nail beam (1) is M-shaped, and the long nail arm (2) and the short nail arm (3) are fixed to the wedge-shaped osteotomy site of the phalanx by fixing teeth (4).

5. The asymmetric arm saddle stitch according to claim 3, characterized in that, The nail beam (1) is C-shaped, and the long nail arm (2) and the short nail arm (3) are fixed to the Z-shaped osteotomy site of the metatarsal shaft by fixing teeth (4).

6. The asymmetric arm saddle stitch according to claim 5, characterized in that, The long nail arm (2) is provided with multiple forked arms (21) at the end away from the nail beam (1), and each forked arm (21) is provided with a fixing tooth (4).

7. The asymmetric arm saddle stitch according to claim 5, characterized in that, Stress teeth (5) are provided between the nail beam (1) and the long nail arm (2) and between the nail beam (1) and the short nail arm (3).

8. The asymmetric arm saddle stitch according to claim 1, characterized in that, The fixing teeth (4) include a plurality of isosceles triangular teeth that are parallel and spaced apart along the length of the nail arm.

9. The asymmetric arm saddle stitch according to claim 1, characterized in that, The nail beam (1), long nail arm (2) and short nail arm (3) are made of nickel-titanium shape memory alloy.

10. The asymmetric arm saddle stitch according to claim 1, characterized in that, The nail beam (1), long nail arm (2) and short nail arm (3) are integrally formed.

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