Asymmetric arm straddle nail
By using asymmetric arm riding staples made of shape memory alloy, the problem of instability of screw fixation in existing osteotomy surgery is solved, achieving more stable bone mass fixation and higher therapeutic effects.
Patent Information
- Application Number
- CN202421184348.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-28
AI Technical Summary
During existing thumb valgus osteotomy surgery, the screw fixation is unstable, which can easily lead to bursting of the bone block, exiting the screw tail and irritating the skin, and re-displacement of the fracture block, affecting the treatment effect and patient comfort.
Asymmetric arm staples made of shape memory alloy, including nail beams, long nail arms and short nail arms, are fixed on the bone block by fixing teeth, and are fixed using the superelastic principle of shape memory alloy.
It effectively avoids the reversal of nail irritation and bone burst caused by screw structure, provides more stable bone mass fixation, reduces the difficulty and complications of the surgery, and improves the treatment effect and patient comfort.
Smart Images
Figure CN222640571U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to an asymmetric arm-riding suture nail. Background Art
[0002] Hallux valgus is a common forefoot deformity with a high incidence rate, which affects wearing shoes and walking. There are many surgical treatments for hallux valgus, but recurrence, metatarsal head necrosis, metastatic metatarsal head pain, and internal fixation irritation protruding subcutaneously causing discomfort in wearing shoes are common. Common hallux valgus osteotomy surgeries (Chevron, Scarf, Ludloff, Akin, etc.) usually require screw fixation, and the postoperative fixation is not firm. Some doctors even use plaster fixation after surgery. However, due to the small bone blocks in the foot, unstable fixation, and possible complications of osteoporosis, thin skin, and less fat, the use of screws to fix the osteotomy blocks often results in the bursting of the bone blocks screwed in, the irritation of the skin by the screws withdrawing from the nail tail, and the displacement of the fracture blocks after a single screw fixation, which affects the treatment effect, causes discomfort in wearing shoes, affects the patient's feelings, and even malformation healing. Utility Model Content
[0003] The utility model aims to provide an asymmetric arm-riding suture nail to avoid the irritation caused by the nail withdrawal after the use of the screw structure.
[0004] The purpose of the utility model can be achieved by the following technical solutions: an asymmetric arm saddle staple, comprising a staple beam made of shape memory alloy, a long staple arm and a short staple arm;
[0005] The long nail arm and the short nail arm are respectively arranged at two ends of the nail beam, the long nail arm and the short nail arm are angled toward each other, and the long nail arm and the short nail arm are both provided with fixing teeth.
[0006] Preferably, the angle between the long nail arm and the short nail arm and the beam length are suitable for elastic recovery of the shape memory alloy to fix the bone fragment after osteotomy.
[0007] Preferably, the nail beam is non-linear.
[0008] Further preferably, the nail beam is in an M-wave shape or a C-shape, fitting the bone surface after osteotomy and correction.
[0009] More preferably, the nail beam is in an M-wave shape, and the long nail arm and the short nail arm are fixed at the wedge-shaped osteotomy of the toe bone by fixing teeth.
[0010] Preferably, the long nail arm is fixed to the proximal end of the phalangeal wedge-shaped osteotomy through a fixing tooth, and the short nail arm is fixed to the distal end of the phalangeal wedge-shaped osteotomy through a fixing tooth.
[0011] Preferably, the phalanx is a proximal phalanx.
[0012] Further preferably, the phalanx is the proximal phalanx of the first phalanx.
[0013] More preferably, the nail beam is C-shaped, and the long nail arm and the short nail arm are fixed at the Z-shaped osteotomy of the metatarsal shaft through fixing teeth.
[0014] Preferably, the long nail arm is fixed to the distal side of the Z-shaped osteotomy of the metatarsal shaft by means of fixing teeth, and the short nail arm is fixed to the proximal side (from inside to outside) of the Z-shaped osteotomy of the metatarsal shaft by means of fixing teeth through holes punched in the proximal metatarsal shaft.
[0015] Further preferably, the long nail arm is fixed to the lower surface of the plantar side of the osteotomy distal bone block through a fixing tooth.
[0016] Further preferably, the metatarsal shaft is the first metatarsal shaft.
[0017] Preferably, a plurality of bifurcated arms are provided at one end of the long nail arm away from the nail beam, and each of the bifurcated arms is provided with a fixing tooth.
[0018] Further preferably, two bifurcated arms are provided at one end of the long nail arm away from the nail beam.
[0019] Preferably, stress (inverted) teeth are provided between the nail beam and the long nail arm, and between the nail beam and the short nail arm.
[0020] Preferably, the fixing teeth include a plurality of isosceles triangular 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 inner sides of the two nail arms that are opposite to each other.
[0022] Preferably, the nail beam, the long nail arm and the short nail arm are made of 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 the fixed teeth on the short nail arm is 2 to 6.
[0025] Preferably, the number of the fixed teeth on the spike arm is 8 to 16.
[0026] It should be noted that, in the present invention, the proximal end refers to the end close to the heart, the distal end refers to the end away from the heart, the medial side refers to the end close to the middle of the two feet, and the lateral side refers to the end away from the middle of the two feet.
[0027] Compared with the prior art, the utility model has the following beneficial effects:
[0028] 1. The utility model can avoid the irritation caused by the screw backing out after the use of the screw structure, and can also avoid the bone bursting caused by the screw structure being screwed into the bone;
[0029] 2. The utility model uses the superelastic principle of shape memory alloy to install the two ends of the bone block after osteotomy in the expanded state to fix the two ends of the bone block. It can make good use of the superelastic principle to firmly fix the two ends of the bone block;
[0030] 3. The utility model saddle nail fits the orthopedic bone surface, and the clamping is more stable, avoiding bone fragmentation, bone displacement, and nail withdrawal. It also avoids bone bursting caused by the screw being screwed into the bone, reducing the difficulty of the operation and making the installation easier. In addition, there is no need for intraoperative measurement or intraoperative fluoroscopy to detect whether the screw is too long to enter the joint surface. The operation is simple and efficient, improving the safety of the operation and reducing complications.
[0031] 4. The shape memory alloy saddle nail with asymmetric arms of the utility model is more in line with the anatomical characteristics of the apposed bone block after hallux orthopedic surgery. The curvature of the long and short arms and the flexible acute angle with the crossbeam make it more in line with the anatomical surface characteristics of the metatarsal and phalangeal bones after osteotomy, which can well reflect the characteristics of wrapping and fixation, and is stable, firm, and will not crush the bone;
[0032] 5. The asymmetric arm shape memory alloy saddle nail of the utility model is more in line with the anatomical characteristics of the metatarsal and phalangeal bones after osteotomy. On the one hand, in addition to several small teeth at the distal end of the arm, the long arm used for the plantar side also has bifurcated double teeth, which can greatly increase the friction and holding force on the lower surface of the metatarsal bone. The three-point clamping is more stable, and the characteristics of wrapping fixation are better reflected, and the fixation is more stable;
[0033] 6. After hallux valgus correction, the bones of the first metatarsal row are rearranged, and it is more difficult to fix with a general bone plate. However, with the utility model, the saddle nail can be installed by making a rough hole in the metatarsal shaft. One side of the short arm is fixed in the hole, and the other side of the long arm is stably held on the lower surface of the metatarsal. Moreover, through the superelastic mechanism of the shape memory alloy, after the two arms are spread apart, it is extremely convenient to install and fix. Such a design is more conducive to surgical operation;
[0034] 7. The saddle staple of the utility model can better apply continuous pressure and promote bone healing through shape and installation design and by utilizing the superelastic principle of shape memory alloy. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 It is a three-view drawing of the saddle stitch nail of Example 3 of the utility model;
[0036] Figure 2 This is a working principle diagram of the saddle stitch staple of Example 3 of the utility model (top view, the part inside the bone is also represented by a solid line);
[0037] Figure 3 It is a three-view drawing of the saddle stitch nail of Example 4 of the utility model;
[0038] Figure 4 The working principle of the saddle stitch nail in the fourth embodiment of the utility model Figure 1 (Side view);
[0039] Figure 5 The working principle of the saddle stitch nail in the fourth embodiment of the utility model Figure 2 (Top view, the bone part is also indicated by solid lines);
[0040] In the figure: 1-nail beam, 2-long nail arm, 21-bifurcated arm, 3-short nail arm, 4-fixing tooth, 5-stress tooth, a-proximal osteotomy block, b-distal osteotomy block. DETAILED DESCRIPTION
[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.
[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0043] All terms (including technical terms or scientific terms) used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. The accompanying drawings are only for illustrating the structure and working principle of the present invention, and are all structural schematic diagrams, not representing the operating state.
[0044] In conjunction with the accompanying drawings, some embodiments of the present utility model are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0045] Example 1
[0046] An asymmetric arm saddle stitch nail made of shape memory alloy comprises a nail beam 1, a long nail arm 2 and a short nail arm 3, wherein the long nail arm 2 is longer than the short nail arm 3. The long nail arm 2 and the short nail arm 3 are respectively arranged at two ends of the nail beam 1 and are angled toward each other, and fixing teeth 4 for fixing are arranged on the long nail arm 2 and the short nail arm 3.
[0047] Example 2
[0048] The invention discloses an asymmetric arm shape memory saddle stitch nail for fixing bone blocks in big toe (metatarsal) 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 the two ends of the same side of the nail beam 1 and are arranged at an angle to the nail beam 1. Fixing teeth 4 are arranged on the inner sides of the long nail arm 2 and the short nail arm 3 relative to each other.
[0049] When the saddle nail of this embodiment is used to pressurize and fix the phalanx model, after fixing the wedge-shaped osteotomy of the phalanx, the elastically fixed saddle nail of this embodiment is inserted, which has two arms, one long and one short. 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 saddle stitch nail of this embodiment is used to perform pressure fixation on the metatarsal model, after the Z-shaped osteotomy of the metatarsal shaft and the correction of the force line of the first metatarsal, the osteotomy blocks at the upper and lower ends are realigned, the proximal side is fixed through the inner cavity of the metatarsal shaft, and the distal side is fixed on the lower surface of the plantar side of the distal end bone block of the osteotomy, and in terms of morphology, one arm is shorter and the other arm is longer.
[0051] Example 3
[0052] An asymmetric arm shape memory alloy suture nail for fixing wedge-shaped osteotomy of phalanges, such as Figure 1 As shown, it includes an M-shaped nail beam 1 and a long nail arm 2 and a short nail arm 3 arranged at both ends of the nail beam 1. The long nail arm 2 and the short nail arm 3 are facing each other at an acute angle, and fixed teeth 4 are provided on the inner sides opposite to each other of the nail arm 2 and the short nail arm 3.
[0053] The saddle nail of this embodiment can be used in Akin osteotomy surgery to pressurize and fix the phalanges after osteotomy. Figure 2 As shown, after Akin osteotomy is performed on the proximal phalanx, holes are drilled at the proximal and distal ends of the osteotomy according to the beam distance, and asymmetric shape memory alloy saddle nails of appropriate sizes are installed on the phalanx. The long nail arm 2 is fixed to the proximal phalanx osteotomy block a, and the short nail arm 3 is fixed to the distal osteotomy block b, and tapped until fixed and stable.
[0054] This embodiment is more convenient for installation and can reduce surgical incisions through the design of asymmetric arm-riding suture nails. It also has a wavy crossbeam, which is more in line with the bone anatomical characteristics of the inner side of the proximal phalanx of the big toe reshaped after osteotomy, and has a low surface notch without nail tail irritation.
[0055] Example 4
[0056] An asymmetric arm shape memory alloy saddle nail for fixing metatarsal Z-type osteotomy, such as Figure 3 As shown, it includes a C-shaped nail beam 1 and a long nail arm 2 and a short nail arm 3 arranged at both ends of the nail beam 1, and the long nail arm 2 and the short nail arm 3 are facing each other at an acute angle. In this embodiment, one end of the long nail arm 2 is connected to the nail beam 1, and the other end is provided with two bifurcated arms 21, and a fixed tooth 4 is provided on the inner side opposite to the bifurcated arm 21 and the short nail arm 3.
[0057] The saddle nail of this embodiment can be used in similar Z-shaped osteotomy surgery to compress and fix the metatarsal shaft after osteotomy, such as Figures 4-5As shown, after the improved Z-type osteotomy of the metatarsal shaft, a hole is punched proximally through the metatarsal shaft near the metatarsal neck, and after the metatarsal asymmetric shape memory alloy saddle nail is spread open, the short nail arm 3 is inserted from the inside to the outside through the hole, and the long nail arm 2 is fixed to the plantar side of the distal metatarsal osteotomy block b and tapped until it is fixed and stable.
[0058] Example 5
[0059] An asymmetric arm shape memory alloy saddle nail for fixing metatarsal Z-shaped osteotomy, wherein a stress tooth 5 is added at the transition between the nail beam and the two nail arms, for effectively expanding the saddle nail at an angle. The rest is the same as that of the fourth embodiment.
[0060] The present embodiment is an asymmetric arm saddle stitch nail for fixing metatarsal shaft osteotomy blocks. After the Z-shaped osteotomy of the metatarsal shaft and the correction of the force line of the first metatarsal, the osteotomy blocks at the upper and lower ends are realigned. The proximal side is fixed through the inner cavity of the metatarsal shaft, and the distal side is fixed on the lower surface of the plantar side of the bone block at the distal end of the osteotomy. In terms of shape, one arm is short and the other arm is long, and there are several small teeth at the end of each arm. At the same time, the long arm used for the plantar side also has bifurcated double teeth for increasing the friction and holding force on the lower surface of the metatarsal.
[0061] The utility model is based on the osteotomy pattern and the matching asymmetric arm shape memory saddle nail, which can match the correction of hallux valgus, avoid the recurrence of hallux valgus, avoid the irritation of internal fixation, and avoid the loosening and displacement of internal fixation. The size can be adjusted to adapt to the anatomical characteristics of big toes of different sizes.
[0062] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.
Claims
1. An asymmetric arm saddle staple, characterized in that: It comprises a nail beam (1), a long nail arm (2) and a short nail arm (3) made of shape memory alloy; The long nail arm (2) and the short nail arm (3) are respectively arranged at two ends of the nail beam (1), the long nail arm (2) and the short nail arm (3) are angled toward each other, and the long nail arm (2) and the short nail arm (3) are both provided with fixed teeth (4).
2. The asymmetric arm-riding stapler according to claim 1, characterized in that: The nail beam (1) is non-linear.
3. The asymmetric arm-riding stapler according to claim 2, characterized in that: The nail beam (1) is in an M-wave shape or a C-shape, and fits the bone surface after osteotomy and correction.
4. The asymmetric arm saddle stapler according to claim 3, characterized in that: The nail beam (1) is in an M-wave shape, and the long nail arm (2) and the short nail arm (3) are fixed at the wedge-shaped osteotomy of the toe bone through fixing teeth (4).
5. The asymmetric arm saddle stapler 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 at the Z-shaped osteotomy of the metatarsal shaft through fixing teeth (4).
6. The asymmetric arm saddle stapler according to claim 5, characterized in that: A plurality of bifurcated arms (21) are provided at one end of the long nail arm (2) away from the nail beam (1), and each of the bifurcated arms (21) is provided with a fixing tooth (4).
7. The asymmetric arm saddle stapler 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-riding stapler according to claim 1, characterized in that: The fixed teeth (4) comprise a plurality of isosceles triangular teeth which are arranged in parallel and at intervals along the length direction of the nail arm.
9. The asymmetric arm saddle stapler according to claim 1, characterized in that: The nail beam (1), the long nail arm (2) and the short nail arm (3) are made of nickel-titanium shape memory alloy material.
10. The asymmetric arm-riding stapler according to claim 1, characterized in that: The nail beam (1), the long nail arm (2) and the short nail arm (3) are integrally formed.