A nail sheath fixation system

Abstract

The utility model discloses a kind of nail sheath fixing systems, including fixed nail and fixed sheath, the fixed nail is provided with protrusion in the circumference, the fixed sheath is the hollow tubular structure of two ends through, the fixed sheath includes first end and second end along length direction, multiple expansion grooves are set along length direction in the first end, multiple clamping grooves matched with the protrusion are set along length direction in the second end.The fixed sheath provided by the utility model uses the structure of two ends through, so that fixed nail can be almost completely implanted fixed sheath, neither obviously increase the length of fixed system and bone channel, can also reduce surgical trauma;Meanwhile, locking system is equipped between fixed nail and fixed sheath, which can effectively prevent the loosening or escape of fixed nail, and further improve the implantation efficiency;In addition, both ends of fixed sheath can be expanded to a certain extent, which can increase the force on the surrounding tissue and enhance the fixing effect.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a nail sheath fixation system. Background Technology

[0002] Existing screw-and-trap fixation systems typically consist of a fixation sheath and fixation pins. The fixation sheath is an elastic or expandable sheath structure, while the fixation pins can be made of metal or polymer materials. During implantation, the fixation sheath is first inserted into the bone tunnel, and then the fixation pin is screwed into the fixation sheath to complete the fixation. However, this current screw-and-trap fixation system has several problems. For example, the fixation pins encounter significant resistance during screwing in, making it difficult to insert them into the fixation sheath; the fixation sheath and fixation pins lack an efficient locking structure, resulting in low pull-out resistance, and the fixation pins are easily dislodged under external pressure; part of the fixation pin is screwed into the fixation sheath, which significantly increases the length of the implanted screw-and-trap fixation structure and the length of the bone tunnel, increasing the difficulty and trauma of the surgery; for screw-and-trap systems made of polymer medical materials, the fixation pins are subjected to pressure from surrounding tissues during the rotation and screwing into the fixation sheath, which can easily lead to excessive resistance and breakage, resulting in implantation failure.

[0003] Therefore, providing a pin sheath fixation system that does not significantly increase the length of the bone tunnel and can effectively prevent the pins from dislodging is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This invention provides a nail sheath fixation system that does not significantly increase the length of the bone tunnel and allows for easy implantation of fixation nails, preventing the fixation nails from loosening or falling out.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A nail-sheath fixing system includes a fixing nail and a fixing sheath. The fixing nail has multiple protrusions in its circumferential direction. The fixing sheath is a hollow tubular structure with both ends connected. The fixing sheath includes a first end and a second end along its length. The first end has multiple expansion grooves along its length, and the second end has multiple snap-fit ​​grooves along its length that can match the protrusions.

[0007] Furthermore, the diameter of the fixing sheath gradually decreases from the first end to the second end.

[0008] Furthermore, the inner wall of the fixing sheath is provided with a groove along the length direction, the groove being provided in a one-to-one correspondence with the snap-fit ​​groove, and the groove extending to the snap-fit ​​groove.

[0009] Furthermore, a plurality of protruding ridges are uniformly arranged on the outer periphery of the fixed sheath, and the plurality of protruding ridges are uniformly distributed along the circumference of the fixed sheath.

[0010] Furthermore, the plurality of said snap-fit ​​slots are evenly distributed circumferentially at the second end.

[0011] Furthermore, the snap-fit ​​groove and the expansion groove are arranged in a staggered manner in the circumferential direction of the fixed sheath.

[0012] Furthermore, the raised surface is provided with fixing teeth.

[0013] Furthermore, a baffle is provided on the end face of the first end.

[0014] Furthermore, the end of the fixation pin is provided with a matching groove that matches the implantation tool.

[0015] Furthermore, both the fixing pin and the fixing sheath are made of absorbable polymer material.

[0016] The beneficial effects of this utility model are as follows:

[0017] The screw-sheath fixation system provided by this invention has many advantages. First, the fixation sheath adopts a through-end design, which allows the fixation screw to be almost completely inserted into the fixation sheath. This does not significantly increase the overall length of the fixation system or the length of the bone tunnel, thereby effectively reducing surgical trauma.

[0018] Secondly, a locking system is provided between the fixation pin and the fixation sheath, which can effectively prevent the fixation pin from loosening or falling out after implantation, thereby improving implantation efficiency.

[0019] Furthermore, both ends of the fixation sheath can expand to a certain extent. This design increases the interaction force between the fixation sheath and the surrounding tissue, thereby enhancing the fixation effect.

[0020] Finally, the fixation pins are directly inserted into the fixation sheath for matching and fixation, avoiding the phenomenon of fixation pins breaking due to excessive resistance caused by rotation, and further improving surgical efficiency. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the nail sheath fixing system of this utility model;

[0022] Figure 2 This is a structural diagram of the process of inserting the fixing nail into the fixing sheath according to this utility model;

[0023] Figure 3 This is an exploded view of the nail sheath fixing system of this utility model;

[0024] Figure 4 This is a structural diagram of the fixed sheath of this utility model.

[0025] The reference numerals in the figures include:

[0026] 100—Fixing pin; 110—Protrusion; 120—Matching groove

[0027] 200—Fixed sheath; 210—First end; 220—Second end

[0028] 230—Expansion groove; 240—Snap-fit ​​groove; 250—Protruding ridge

[0029] 260—Baffle plate 270—Groove Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] As shown in Figures 1 and 2, this utility model provides a nail-sheath fixing system, which mainly includes a fixing nail 100 and a fixing sheath 200 that cooperate with each other. The fixing nail 100 is pressed into the fixing sheath 200 and the two are locked together, thus achieving the fixing function as a whole system.

[0035] Specifically, as shown in Figure 1, the fixation sheath 200 is a hollow tubular structure with both ends connected. The fixation sheath 200 includes a first end 210 and a second end 220 along its length, which are fixedly connected together. The diameter of the fixation sheath 200 gradually decreases from the first end 210 to the second end 220. This tapered design increases the ease of implantation of the fixation sheath 200 and matches the diameter variation of the fixation pin 100. The fixation pin 100 is generally a conical structure (its diameter gradually decreases from one end to the other along its length).

[0036] like Figure 1 As shown, the first end 210 of the fixation sheath 200 is provided with a plurality of expansion grooves 230 along the length direction. The plurality of expansion grooves 230 are evenly distributed in the circumferential direction of the first end 210. When the fixation nail 100 is inserted into the fixation sheath 200, the opening of the expansion groove 230 expands and opens due to the compression of the fixation nail 100, and interacts with the surrounding bone channel, so that the fixation sheath 200 is stable in the bone channel and is not easy to slide.

[0037] like Figure 1 As shown, the second end 220 of the fixing sheath 200 is provided with a plurality of snap-fit ​​grooves 240 along its length, and the plurality of snap-fit ​​grooves 240 are evenly distributed in the circumferential direction of the second end 220. Figure 3 As shown, the fixing pin 100 has a plurality of protrusions 110 evenly arranged in the circumferential direction. When the fixing pin 100 is inserted into the fixing sheath 200, the protrusions 110 can match the locking groove 240 to achieve locking and prevent the fixing pin 100 from being dislodged or sliding relative to the fixing sheath after insertion.

[0038] like Figure 1-4 As shown, the expansion groove 230 and the snap-fit ​​groove 240 are staggered in the circumferential direction of the fixed sheath 200, meaning that the snap-fit ​​groove 240 and the expansion groove 230 do not intersect each other when extending along the length of the fixed sheath 200. The staggered distribution of the groove-like structures at both ends of the fixed sheath 200 can prevent simultaneous cracking from both ends when subjected to external forces during use, thus preventing the fixed sheath 200 from cracking along its entire length; or preventing cracking from the grooves at both ends when stress is too concentrated.

[0039] like Figure 4 As shown, multiple grooves 270 are provided along the length of the inner wall of the fixation sheath 200. Each groove 270 corresponds to a locking groove 240, and the grooves 270 extend to the locking grooves 240. During implantation, the protrusions 110 on the surface of the fixation pin 100 first align with the corresponding grooves 270 and slide along the grooves 270 until they slide into the locking grooves 240, achieving locking. The cooperation between the locking grooves 240 and the protrusions 110 provides a more uniform holding force, making the fixation sheath 200 and the fixation pin 100 more stable within the bone tunnel, further improving the problem of loosening in the pin-sheath fixation system.

[0040] like Figure 3 and Figure 4 As shown, multiple protrusions 250 are evenly arranged on the outer periphery of the fixation sheath 200. These protrusions 250 are positioned near the second end 220 and can act on surrounding tissues, increasing friction between the fixation sheath 200 and the bone tunnel, further enhancing the stability of the fixation sheath 200 within the bone tunnel and preventing dislodgement. Multiple baffles 260 are evenly distributed on the end face of the first end 210 of the fixation sheath 200, with a gap between each pair of adjacent baffles 260. During implantation, as the expansion groove 230 opens, the gap between adjacent baffles 260 gradually increases, and the baffles 260 abut against the bone tunnel, penetrating deeper into the surrounding tissues, enhancing the holding force of the fixation sheath 200, strengthening fixation, and preventing slippage or dislodgement of the fixation sheath 200.

[0041] like Figure 3 As shown, a matching groove 120 is provided at the center of the end of the fixation pin 100. The matching groove 120 is used to cooperate with the implantation tool. It can be a through-hole groove structure that passes through both ends of the fixation pin 100 so as to cooperate with tools such as guide wires; or it can be a non-through polygonal groove structure so as to cooperate with tools such as pin holders.

[0042] The protrusion 110 of the fixation pin 100 is provided with multiple fixing teeth (not shown in the figure). The fixing teeth are toothed, and the openings of the teeth all face the same direction of the fixation pin 100, so that after the fixation pin 100 enters the fixation sheath 200, the openings of the fixing teeth all face the first end 210 of the fixation sheath 200. Therefore, when the fixation pin 100 is locked with the fixation sheath 200, most of the surface of the fixation pin 100 does not directly contact the surrounding bone tunnel (or tissue). Only the protrusion 110 exposed from the locking groove 240 can contact the surrounding bone tunnel (or tissue). At this time, the fixing tooth structure on the surface of the protrusion 110 can significantly increase the friction between the fixation pin 100 and the surrounding bone tunnel (or tissue). In addition, the fixing teeth with openings facing the first end 210 can effectively prevent the fixation pin 100 from sliding along the direction from the second end 220 toward the first end 210, thereby further enhancing the stability of the pin-sheath fixation system within the bone tunnel.

[0043] The fixation pin 100 and fixation sheath 200 of the fixation system provided by this utility model are both made of medical-grade absorbable polymer materials. These absorbable polymer materials include: poly(L-lactide), poly(D-lactide), poly(DL-lactide), poly(glycolic acid), glycolide-lactide polymer, poly(ε-caprolactone), ε-caprolactone-lactide polymer, polyethylene glycol, poly(3-methylene carbonate), 3-methylene carbonate-lactide polymer, etc., or copolymers of two or more of the above materials. The copolymers can be random copolymers, isotactic copolymers, block copolymers, graft copolymers, etc. The absorbable polymer material is made from one or more raw materials, including polylactic acid (L-L), polymers of L-lactic acid and dextro-lactic acid, lactic acid-glycolic acid copolymers, lactic acid-caprolactone blends, and p-dioxanone-lactide.

[0044] The fixation system made of medical-grade absorbable polymer materials gradually decreases in strength as the surgical site heals, slowly transferring stress to the bone and stimulating bone healing. This avoids the pain and financial burden of secondary surgery required for traditional metal internal fixation devices, reducing surgical risks and the workload of medical staff. Compared to traditional materials, medical-grade absorbable polymer materials have better biocompatibility, reducing the likelihood of adverse reactions such as inflammation and rejection. During the degradation process in vivo, the degradation products of medical-grade absorbable polymer materials can participate in the body's physiological metabolic processes, promoting tissue repair and regeneration. Medical devices made of medical-grade absorbable polymer materials, after degradation in vivo, do not interfere with imaging examinations like traditional metal materials, facilitating accurate assessment of the patient's postoperative recovery by doctors.

[0045] Existing fixation systems made of absorbable medical polymers mostly employ screw structures with external threads, using a screw-in implantation method. However, the strength of screws made of absorbable medical polymers is far lower than that of metal screws, making them prone to breakage due to external resistance during screwing. The fixation screw 100 of this invention has a smoother outer surface, and it is directly inserted or tapped into the fixation sheath 200, effectively avoiding rotational breakage and improving surgical success rates. Furthermore, the opening size of the first end 210 of the fixation sheath 200 is at its maximum diameter, larger than the diameter of the implantation end of the fixation screw 100. Therefore, the fixation screw 100 experiences less resistance during implantation, making the operation more convenient and effortless.

[0046] like Figure 1-3As shown, the working process and principle of the fixation system provided by this utility model are as follows: During the fixation surgery, the fixation sheath 200 is first implanted into the bone tunnel. Then, the implantation tool is matched with the matching groove 120 of the fixation nail 100, and the fixation nail 100 is inserted into the first end 210 of the fixation sheath 200. The relative position of the fixation nail 100 and the fixation sheath 200 is adjusted so that the protrusion 110 on the surface of the fixation nail 100 matches the corresponding groove 270 of the fixation sheath 200. The fixation nail 100 is tapped, causing the protrusion 110 to slide along the groove 270, and the fixation nail 100 gradually enters the fixation sheath 200 until the protrusion 110 slides from the groove 270 into the locking groove 240, thereby locking the fixation sheath 200 and the fixation nail 100. During this process, both ends of the fixation sheath 200 can expand outward and abut against the surrounding tissues. The baffle 260 expands outward and the protrusion 250 penetrates deeper into the surrounding tissues, thereby increasing the stability of the fixation sheath 200 in the bone tunnel and preventing it from dislodging later.

[0047] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.

Claims

1. A nail sheath fixing system, characterized in that, It includes a fixing pin (100) and a fixing sheath (200) that match each other. The fixing pin (100) has a plurality of protrusions (110) in the circumferential direction. The fixing sheath (200) is a hollow tubular structure that is open at both ends. The fixing sheath (200) includes a first end (210) and a second end (220) along the length direction. The first end (210) has a plurality of expansion grooves (230) along the length direction. The second end (220) has a plurality of snap-fit ​​grooves (240) along the length direction that can match the protrusions (110).

2. The nail sheath fixing system according to claim 1, characterized in that, The diameter of the fixed sheath (200) gradually decreases from the first end (210) to the second end (220).

3. The nail sheath fixing system according to claim 1, characterized in that, The inner wall of the fixing sheath (200) is provided with a groove (270) along the length direction. The groove (270) is provided in a one-to-one correspondence with the snap-fit ​​groove (240), and the groove (270) extends to the snap-fit ​​groove (240).

4. The nail sheath fixing system according to claim 3, characterized in that, The outer periphery of the fixed sheath (200) is uniformly provided with multiple protruding ridges (250).

5. The nail sheath fixing system according to claim 4, characterized in that, The plurality of said snap-fit ​​grooves (240) are evenly distributed circumferentially at the second end (220), and the plurality of said expansion grooves (230) are evenly distributed circumferentially at the first end (210).

6. The nail sheath fixing system according to claim 5, characterized in that, The snap-fit ​​groove (240) and the expansion groove (230) are arranged in a staggered manner around the fixed sheath (200).

7. The nail sheath fixing system according to claim 6, characterized in that, A baffle (260) is provided on the end face of the first end (210).

8. The nail sheath fixing system according to claim 3, characterized in that, The protrusion (110) surface is provided with fixing teeth.

9. The nail sheath fixing system according to claim 8, characterized in that, The end of the fixation pin (100) is provided with a matching groove (120) that matches the implantation tool.

10. The nail sheath fixing system according to claim 7, characterized in that, Both the fixing pin (100) and the fixing sheath (200) are made of absorbable polymer material.

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