Screw-in type medical anchor with thread

Abstract

The utility model discloses a screw-in type medical anchor with a thread, which relates to the technical field of medical instruments, and comprises an anchor main body and a thread fixing body, one end of the anchor main body is provided with a pointed cone structure, the other end of the anchor main body is provided with a containing groove for containing the thread fixing body, the peripheral wall of the anchor main body is spirally provided with threads, the threads comprise a plurality of threads, and the threads are arranged in the containing groove. Each screw tooth spirally rotates around the anchor main body for a circle, and a screw groove between every two adjacent screw teeth is a conical groove. And the groove wall of the conical groove is an arc-shaped wall. The rivet main body comprises a rivet part and a head part, one end of the rivet part is connected with the head part, the other end of the rivet part is provided with the containing groove, the head part is provided with the pointed cone structure, and the thread extends to the head part from the rivet part. The conical groove can effectively increase the contact area between the bone surface and the anchor body, and the overall stability of the anchor body is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a screw-in medical anchor nail with a wire. Background Art

[0002] In daily life, ligament injuries in ordinary people are common in the ankle joints, knee joints, metacarpal joints, and finger joints. Ligament rupture is generally caused by rapid movements beyond the range of joint movement during strenuous activities, which leads to passive traction of the relevant ligaments and causes tearing or complete rupture. Ligament rupture is often accompanied by sprains and fractures. Ligament injuries should be diagnosed, treated, and reattached in a timely manner. Immediately after the injury, immobilization and local cooling should be adopted to delay and reduce swelling, bleeding, and infection, and pain relief should be given at the same time, and then go to the hospital for treatment in time. When repairing existing ligaments, an anchor is used to fix the fractured bone or other tissue that needs to be fixed. This anchor is connected to the bone through a special wire or cable to help stabilize and repair the injured area. Chinese patent CN202120566507.9 discloses an anchor with anti-retraction barbs, including an outer anchor body, an anchor head fixedly connected to the lower end of the outer anchor body to facilitate the device to drill into the bone, an internal threaded rod rotatably provided inside the threaded rod groove of the outer anchor body, a square tightening head fixedly provided on the upper end of the internal threaded rod, and a medical suture fixedly connected to the upper end of the square tightening head for suturing ligaments. In order to ensure the stability of the anchor after implantation, it is difficult to add relevant reinforcement structures to the outer anchor body, so the threads on the outer wall of the outer anchor body will directly affect the firmness, and the selection of thread type is crucial. Although the outer wall of the outer anchor body of the above patent is fixedly connected to a spiral sheet, the contact area between the spiral sheet and the bone surface is small, and the fixing effect is not ideal. Utility Model Content

[0003] In response to the technical problem in the prior art that the contact area between the spiral piece of the anchor and the bone surface is small, the utility model proposes a screw-in medical anchor with a wire. The screw groove between two adjacent screw teeth is a conical groove, which effectively increases the contact area between the bone surface and the anchor body and ensures the overall stability of the nail body.

[0004] The technical solution adopted by the utility model is as follows: a screw-in medical anchor with a wire, comprising an anchor body and a wire fixing body, one end of the anchor body is provided with a pointed cone structure, the other end of the anchor body is provided with a groove for accommodating the wire fixing body, the outer peripheral wall of the anchor body is spirally provided with a thread, the thread includes a plurality of screw teeth, each of the screw teeth spirally rotates one circle around the anchor body, and the screw groove between two adjacent screw teeth is a tapered groove.

[0005] Optionally, the groove wall of the tapered groove is an arc-shaped wall.

[0006] Optionally, the screw thread is an unequal-slope trapezoidal structure.

[0007] Optionally, the anchor body includes a nail portion and a head, one end of the nail portion is connected to the head, the other end of the nail portion is provided with the receiving groove, the head is provided with the pointed cone structure, and the thread extends from the nail portion to the head.

[0008] Optionally, the pitch between adjacent screw threads on the head is a first pitch, the pitch between adjacent screw threads on the nail portion is a second pitch, and the first pitch is greater than the second pitch.

[0009] Optionally, the nail portion and the head portion are respectively made of absorbable materials.

[0010] Optionally, the anchor body is made by 3D printing.

[0011] Optionally, the thread fixing body is provided with a through hole for allowing the medical suture thread to pass through.

[0012] The beneficial effects of the present invention are as follows: the tapered groove can effectively increase the contact area between the bone surface and the anchor body, ensuring the overall stability of the nail body. The groove wall of the tapered groove is an arc-shaped wall. The design of the arc-shaped wall further increases the contact area between the bone surface and the anchor body. The pitch between adjacent screw teeth located at the head is a first pitch, and the pitch between adjacent screw teeth located at the nail portion is a second pitch, and the first pitch is greater than the second pitch. The design of the pitch of the head being greater than the pitch of the nail portion allows the head to enter the bone faster, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of a screw-in medical anchor with a wire proposed in an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the screw groove of the screw-in medical anchor with wire proposed in an embodiment of the present utility model.

[0015] The markings in each figure are: 1. anchor body; 2. wire fixing body; 3. pointed cone structure; 4. screw thread; 5. screw groove; 6. nail part; 7. head; 8. first pitch; 9. second pitch. DETAILED DESCRIPTION

[0016] The present application will be further described in detail below with reference to the accompanying drawings and examples.

[0017] like Figure 1As shown, this embodiment discloses a screw-in medical anchor with a wire, comprising an anchor body 1 and a wire fixation body 2. One end of the anchor body 1 is provided with a pointed cone structure 3, and the other end of the anchor body 1 is provided with a receptacle for accommodating the wire fixation body 2. The outer peripheral wall of the anchor body 1 is spirally threaded, comprising a plurality of threads 4, each of which rotates one revolution around the anchor body 1. The groove 5 between two adjacent threads 4 is a tapered groove. The tapered groove effectively increases the contact area between the bone surface and the anchor body 1, ensuring the overall stability of the anchor body. The wire fixation body 2 is connected to the receptacle of the anchor body by an interference fit.

[0018] like Figure 2 As shown, the tapered groove has an arcuate wall. This arcuate wall design further increases the contact area between the bone surface and the anchor body 1. The thread 4 has an unequal-shouldered trapezoidal structure. This unequal-shouldered trapezoidal structure combines the high transmission efficiency of rectangular threads with the high root strength of trapezoidal threads. This design ensures the anchor body 1 remains secure after implantation, a feature not found in conventional or interrupted threads.

[0019] like Figure 1 As shown, the anchor body 1 includes a nail portion 6 and a head portion 7. One end of the nail portion 6 is connected to the head portion 7, and the other end of the nail portion 6 is provided with the receiving groove. The head portion 7 is provided with the pointed cone structure 3. The thread extends from the nail portion 6 to the head portion 7. Compared to traditional thread types, the thread extending to the head portion 7 has an increased number of threads 4, making the anchor more stable and secure during use. The diameter of the nail portion 6 is larger than that of the head portion 7, and the head portion 7 and the pointed cone structure 3 form a cone.

[0020] like Figure 1 As shown, the pitch between adjacent screw teeth 4 of the head 7 is a first pitch 8, and the pitch between adjacent screw teeth 4 of the nail portion 6 is a second pitch 9, wherein the first pitch 8 is greater than the second pitch 9. The pitch of the head 7 is greater than the pitch of the nail portion 6. This arrangement allows the head 7 to enter the bone faster, thereby improving efficiency.

[0021] like Figure 1As shown, the nail portion 6 and the head portion 7 are respectively made of absorbable materials. The absorbable material is made of one of the following biocomposite materials: polylactic acid-co-glycolic acid copolymer / β-tricalcium phosphate, polylactic acid-co-glycolic acid copolymer / hydroxyapatite, polylactic acid-co-glycolic acid copolymer / β-tricalcium phosphate / calcium sulfate, poly-L-lactic acid / β-tricalcium phosphate, poly-L-lactic acid / hydroxyapatite, poly-L-lactic acid / β-tricalcium phosphate / calcium sulfate, poly-L-lactic acid / polylactic acid-co-glycolic acid copolymer / β-tricalcium phosphate, and poly-L-lactic acid / polylactic acid-co-glycolic acid copolymer / hydroxyapatite. The anchor body 1 is made by 3D printing. 3D printed implants can better adapt to the patient's anatomical structure, thereby improving the success rate of the operation, having higher adaptability, and reducing the risk of postoperative complications. The specific operation method is as follows: implant a positioning anchor near the location where the bone tunnel needs to be established, perform CT and MRI scans, and obtain cross-sectional image data of the bone; implant the positioning anchor into the knee joint, with the implantation direction consistent with the direction of the bone tunnel during anterior cruciate ligament reconstruction surgery, and the implantation point is 5 cm away from the bone tunnel exit during anterior cruciate ligament reconstruction; use Mimics software to process the data obtained in the above steps to establish a geometric model of the bone or joint with the anchor, and then transfer the geometric model to Simpleware 3D modeling software, and simulate the establishment of a virtual bone tunnel and a guide plate connected to the positioning anchor according to the predetermined bone tunnel location and direction.

[0022] like Figure 1 As shown, the thread anchor has a through-hole for passing a medical suture. Medical sutures are used to suture ligaments. After the suture passes through the through-hole, both ends of the suture are stretched and restrained away from the anchor body. As the anchor body penetrates the bone, the suture is drawn into the bone, facilitating manipulation of the suture.

[0023] It is understandable that the specific embodiments described above are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts. Any equivalent structural transformation made using the contents of the description and drawings of this utility model, directly or indirectly used in other related technical fields, are also included in the protection scope of this utility model.

Claims

1. A screw-in medical anchor with a wire, characterized in that: It includes an anchor body and a wire fixing body, one end of the anchor body is provided with a pointed cone structure, and the other end of the anchor body is provided with a groove for accommodating the wire fixing body. The outer peripheral wall of the anchor body is spirally provided with a thread, and the thread includes several screw teeth, each of which spirally rotates around the anchor body once, and the screw groove between two adjacent screw teeth is a tapered groove.

2. The screw-in medical anchor with wire according to claim 1, characterized in that: The groove wall of the tapered groove is an arc-shaped wall.

3. The screw-in medical anchor with wire according to claim 1, characterized in that: The screw thread is an unequal-slope trapezoidal structure.

4. The screw-in medical anchor with wire according to claim 1, characterized in that: The anchor body includes a nail portion and a head portion, one end of the nail portion is connected to the head portion, the other end of the nail portion is provided with the receiving groove, the head portion is provided with the pointed cone structure, and the thread extends from the nail portion to the head portion.

5. The screw-in medical anchor with wire according to claim 4, characterized in that: The pitch between adjacent screw threads on the head is a first pitch, the pitch between adjacent screw threads on the nail portion is a second pitch, and the first pitch is greater than the second pitch.

6. The screw-in medical anchor with a wire according to claim 4, characterized in that: The nail portion and the head portion are respectively made of absorbable materials.

7. The screw-in medical anchor with wire according to claim 1, characterized in that: The anchor body is made by 3D printing.

8. The screw-in medical anchor with wire according to claim 1, characterized in that: The thread fixing body is provided with a through hole for allowing the medical suture thread to pass through.

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