Artificial ligament bone end extrusion type fixing device with V-shaped opening

Abstract

The present application relates to the technical field of medical appliances, and discloses a bone end extrusion type fixing device for artificial ligament with V-shaped openings, a fixing body is a through hollow cavity, two groups of V-shaped openings are symmetrically arranged on the side wall, a one-way inner reverse tooth is arranged on the inner wall, and a pagoda-shaped anti-skid protrusion is arranged on the outer wall; a sharp spike is arranged on the bottom end of a cap, the fixing body is passed through an artificial ligament, then the device is implanted into a bone tunnel through knocking, the V-shaped openings are gradually gathered under the extrusion of a bone wall, a circumferential ring-shaped extrusion force is formed to tightly hold the artificial ligament, reliable fixation is realized by cooperation of the inner reverse tooth and the anti-skid protrusion on the outer wall of the fixing body, meanwhile, the sharp spike on the cap is inserted into the surface layer of the bone cortex to limit, locking screws can be selectively used for patients with osteoporosis, the fixing effect is enhanced, the cutting damage of the interface screw to the ligament can be effectively avoided, the fixing stability of the patient with osteoporosis is improved, and the tendon-bone contact area is expanded to promote bone healing.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an artificial ligament bone end compression fixation device. Background Technology

[0002] Currently, the two most widely used methods for anterior cruciate ligament reconstruction surgery are autologous tendons and artificial ligaments. Among them, artificial ligaments (such as the French LARS ligament and domestic ligaments) have strong tensile strength, which can help patients restore knee joint stability in the early postoperative period. They have significant advantages, especially for athletes or young people with high sports demands.

[0003] Currently, in clinical practice, when using artificial ligament reconstruction, the bone tunnel end is fixed with interface screws. During the screw insertion process, the ligament is inevitably cut, and repeated flexion and extension fatigue leads to fiber delamination and rupture. Over-tightening during surgery can directly rupture the ligament, which is a significant cause of early failure. Furthermore, after the interface screw is fixed, the ligament contact surface cannot contact the bone tissue, affecting the ingrowth of its own bone tissue.

[0004] Therefore, this invention aims to design an artificial ligament bone end fixation device with a "V"-shaped opening, which can not only more effectively increase fixation stability, but also reduce ligament cutting and increase the contact area with bone tissue, thereby reducing the probability of postoperative ligament failure. Summary of the Invention

[0005] The purpose of this invention is to provide an artificial ligament bone end compression fixation device with a V-shaped opening, which solves the problems of existing technology where interface screws easily cut ligament fibers, leading to postoperative wear and breakage, insufficient screw holding force and easy loosening and dislodgement in patients with osteoporosis with insufficient bone volume, as well as unilateral fixation stress concentration and insufficient tendon-bone contact area, which are not conducive to bone integration and long-term healing.

[0006] To achieve the above objectives, the present invention provides an artificial ligament bone end compression fixation device with a V-shaped opening, comprising a fixation body, a cap, two sets of "V"-shaped openings, internal countersunk teeth, anti-slip protrusions, and spikes; The bottom outer diameter of the fixation body is larger than the top outer diameter, while the inner diameters are the same. Two sets of "V"-shaped openings are symmetrically designed on the top sides of the fixation body. The top of the "V"-shaped opening is round to prevent the opening from elongating due to long-term metal fatigue. The inner countertooth is located on the inner side of the fixation body, and the anti-slip protrusion is located on the outer side of the fixation body. The cap circle is fixedly connected to the fixation body and is located on the top outer side of the fixation body. The spike is fixedly connected to the cap circle and is located at the bottom of the cap circle. The cap circle has two layers, with the bottom layer being larger to facilitate removal of the fixation device during revision. The cap circle has a pair of symmetrically distributed locking screw holes, which facilitates the selection of locking screws for reinforcement during surgery.

[0007] The tips of the inner teeth are inclined toward the bottom of the fixing body, forming a one-way locking structure.

[0008] The anti-slip protrusions are multiple sets of annular protrusions arranged along the axial direction of the fixed body, and have a pagoda structure, with the outer diameter gradually increasing from the top to the bottom.

[0009] The fixing body also includes locking screw holes, with two sets of locking screw holes symmetrically arranged on the cap circle and the fixing body, and the two sets of locking screw holes are radially connected along the fixing body.

[0010] The fixed body has a total length of 15mm, an inner diameter of 7.5mm, a bottom outer diameter of 15mm, and a top outer diameter of 8mm; the bottom width of the "V"-shaped opening is 5mm, and the axial length is 10mm.

[0011] This invention discloses a bone end compression fixation device for artificial ligaments with V-shaped openings. The fixation body is a through-hole cavity with two sets of symmetrical "V"-shaped openings on its sidewalls. The inner wall has unidirectional inward-curved teeth, and the outer wall has pagoda-shaped anti-slip protrusions. A spike is provided at the bottom of the cap. The fixation body passes through the artificial ligament, and after the device is implanted into the bone tunnel by tapping, the "V"-shaped openings gradually close under the pressure of the bone wall, forming a circumferential compression force that tightens the artificial ligament. This, combined with the inward-curved teeth and the anti-slip protrusions on the outer wall of the fixation body, achieves reliable fixation. Simultaneously, the spike on the cap penetrates the surface of the bone wall for positioning. For patients with osteoporosis, a locking screw can be selectively added. The screw enhances fixation and effectively avoids cutting damage to ligaments caused by interface screws, improves fixation stability in patients with osteoporosis, and expands the tendon-bone contact area to promote bone healing. It is suitable for fixing femoral artificial ligaments in anterior cruciate ligament reconstruction of the knee joint. It solves the problems of existing technologies, such as easy cutting of ligament fibers leading to postoperative wear and breakage when fixing artificial ligaments with interface screws, insufficient screw holding force and easy loosening and dislodgement in patients with insufficient bone volume in osteoporosis, as well as stress concentration in unilateral fixation and insufficient tendon-bone contact area which are not conducive to bone integration and long-term healing. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a structural diagram of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention.

[0015] Figure 3 This is a schematic diagram of the installation of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention.

[0016] In the diagram: 101-fixed body, 102-cap circle, 103-"V" shaped opening, 104-inner counterslip teeth, 105-anti-slip protrusion, 106-spiky barb, 107-locking screw hole. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] Please refer to Figures 1 to 3 , Figure 1 This is a structural diagram of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention. Figure 2 This is a schematic diagram of the structure of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention. Figure 3 This is a schematic diagram of the installation of an artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention.

[0019] This invention provides a compression fixation device for artificial ligament bone ends with a V-shaped opening, comprising a fixation body 101, a cap 102, two sets of "V"-shaped openings 103, internal countersunk teeth 104, anti-slip protrusions 105, spikes 106, and locking screw holes 107. It solves the problems of existing technologies where interface screws easily cut ligament fibers, leading to postoperative wear and breakage, insufficient screw holding force and easy loosening and dislodgement in patients with osteoporosis with insufficient bone volume, as well as unilateral fixation stress concentration and insufficient tendon-bone contact area, which are not conducive to bone integration and long-term healing.

[0020] In this embodiment, the bottom outer diameter of the fixing body 101 is larger than the top outer diameter, while the inner diameters are the same. Two sets of "V"-shaped openings 103 are symmetrically designed on both sides of the top of the fixing body 101. The top of each "V"-shaped opening 103 is circular to prevent the opening from elongating due to long-term metal fatigue. The inner countertooth 104 is located on the inner side of the fixing body 101, and the anti-slip protrusion 105 is located on the outer side of the fixing body 101. The cap circle 102 is fixedly connected to the fixing body 101 and located on the top outer side of the fixing body 101. The spike 106 is fixedly connected to the cap circle 102 and located at the bottom of the cap circle 102. The fixing body 101 is a through-hole hollow cavity with two sets of "V"-shaped openings symmetrically opened on the side walls, and the inner wall has a one-way... The inner inverted teeth 104 have pagoda-shaped anti-slip protrusions 105 on their outer walls; the bottom of the cap 102 has spikes 106. The fixing body 101 passes through the artificial ligament, and after the device is implanted into the bone tunnel by tapping, the "V"-shaped opening 103 is gradually squeezed by the bone wall, forming a circumferential ring-shaped squeezing force to hold the artificial ligament. This, combined with the inner inverted teeth 104 and the anti-slip protrusions 105 on the outer wall of the fixing body 101, achieves reliable fixation. At the same time, the spikes 106 penetrate the surface of the bone wall for limiting the fixation. For patients with osteoporosis, locking screws can be selectively added to enhance the fixation effect. This can effectively avoid the cutting damage of the ligament to the interface screw, improve the fixation stability of patients with osteoporosis, and expand the tendon-bone contact area to promote bone healing. It is suitable for fixation of the femoral side artificial ligament in the reconstruction of the anterior cruciate ligament of the knee joint.

[0021] The tips of the inner reverse teeth 104 are inclined toward the bottom end of the fixing body, forming a one-way locking structure. The inner reverse teeth 104 allow the artificial ligament to only pass through from the top to the bottom in one direction.

[0022] Secondly, the anti-slip protrusions 105 are multiple sets of annular protrusions arranged along the axial direction of the fixed body 101, and have a pagoda structure. The outer diameter gradually increases from the top to the bottom. After the device is implanted into the bone tunnel, the annular protrusions are embedded in the cancellous bone of the inner wall of the bone tunnel, which can significantly improve the axial pull-out resistance and reduce the risk of device withdrawal after surgery.

[0023] Furthermore, the fixation body 101 also includes locking screw holes 107. Two sets of locking screw holes 107 are symmetrically arranged on the cap circle 102 and the fixation body 101, and the two sets of locking screw holes 107 are radially connected along the fixation body. The locking screw holes 107 allow the device to install screws, thereby performing secondary positioning and further improving stability. In actual use, the patient's bone density can be assessed. If the patient has severe osteoporosis, two screws can be screwed in from both sides, cross through the artificial ligament, and anchored to the contralateral bone cortex to complete three-dimensional locking reinforcement.

[0024] Finally, the total length of the fixation body 101 is 15mm, the inner diameter is 7.5mm, the outer diameter at the bottom is 15mm, and the outer diameter at the top is 8mm; the bottom width of the “V”-shaped opening 103 is 5mm, the axial length is 10mm, and the inner diameter of the entire section is uniformly 7.5mm, matching the clinical standard 7.5mm femoral bone tunnel and the corresponding specification of artificial ligament; the total axial length of the body is 15mm, the outer diameter at the top is 8mm, and the outer diameter at the bottom is 15mm, forming a cone shape that narrows from the bottom to the top, which facilitates the directional insertion into the bone tunnel. When the fixation body 101 is subjected to radial compression, the gap of the “V”-shaped opening 103 decreases, the entire body contracts radially, and hugs the internal artificial ligament from circumferential 360°, forming a uniform annular compression fixation force.

[0025] When using the artificial ligament bone end compression fixation device with a V-shaped opening according to the present invention, the fixation body 101 is a through hollow cavity with two sets of "V"-shaped openings 103 symmetrically opened on the side wall. The inner wall is provided with unidirectional inverted teeth 104, and the outer wall is provided with pagoda-shaped anti-slip protrusions 105. The bottom end of the cap 102 is provided with spikes 106. After the fixation body 101 is inserted through the artificial ligament, and then the device is implanted into the bone tunnel by tapping, the "V"-shaped openings 103 are gradually squeezed by the bone wall, forming a circumferential ring-shaped compression force to hold the artificial ligament tightly. This, combined with the inverted teeth 104 and the anti-slip protrusions 105 on the outer wall of the fixation body 101, creates a circumferential ring-shaped compression force that holds the artificial ligament tightly. This method achieves reliable fixation, while the spike 106 penetrates the surface of the bone wall for limiting the fixation. For patients with osteoporosis, locking screws can be selectively added to enhance the fixation effect. It can effectively avoid the cutting damage of the interface screw to the ligament, improve the fixation stability of patients with osteoporosis, and expand the tendon-bone contact area to promote bone healing. It is suitable for fixation of the femoral artificial ligament in the reconstruction of the anterior cruciate ligament of the knee joint. It solves the problems of existing technology where interface screws easily cut ligament fibers and cause postoperative wear and breakage when fixing artificial ligaments, insufficient screw holding force and easy loosening and dislodgement when osteoporotic patients have insufficient bone volume, as well as unilateral fixation stress concentration and insufficient tendon-bone contact area which are not conducive to bone integration and long-term healing.

[0026] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A compression fixation device for artificial ligament bone ends with a V-shaped opening, characterized in that, Includes a fixed body, a round cap, two sets of "V" shaped openings, internal counter-teeth, anti-slip protrusions, and spikes; The bottom outer diameter of the fixation body is larger than the top outer diameter, while the inner diameters are the same. Two sets of "V"-shaped openings are symmetrically designed on the top sides of the fixation body. The top of the "V"-shaped opening is round to prevent the opening from elongating due to long-term metal fatigue. The inner countertooth is located on the inner side of the fixation body, and the anti-slip protrusion is located on the outer side of the fixation body. The cap circle is fixedly connected to the fixation body and is located on the top outer side of the fixation body. The spike is fixedly connected to the cap circle and is located at the bottom of the cap circle. The cap circle has two layers, with the bottom layer being larger to facilitate removal of the fixation device during revision. The cap circle has a pair of symmetrically distributed locking screw holes, which facilitates the selection of locking screws to strengthen fixation according to the specific situation during surgery.

2. The artificial ligament bone end compression fixation device with a V-shaped opening as described in claim 1, characterized in that, The tips of the inner countersunk teeth are inclined toward the bottom end of the fixing body, forming a one-way locking structure.

3. The artificial ligament bone end compression fixation device with a V-shaped opening as described in claim 1, characterized in that, The anti-slip protrusions are multiple sets of annular protrusions arranged along the axial direction of the fixed body, and have a pagoda structure, with the outer diameter gradually increasing from the top to the bottom.

4. The artificial ligament bone end compression fixation device with a V-shaped opening as described in claim 1, characterized in that, The fixing body also includes locking screw holes. Two sets of locking screw holes are symmetrically arranged on the cap circle and the fixing body, and the two sets of locking screw holes are radially connected along the fixing body.

5. The artificial ligament bone end compression fixation device with a V-shaped opening as described in claim 4, characterized in that, The total length of the fixing body is 15mm, the inner diameter is 7.5mm, the bottom outer diameter is 15mm, and the top outer diameter is 8mm; the bottom width of the "V" shaped opening is 5mm, and the axial length is 10mm.

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