Engaging wing sheath type fixing screw

Abstract

The utility model discloses a meshing wing sheath type fixing screw, which relates to the field of medical instruments and comprises an inner screw and a meshing expansion wing type fixing sheath, meshing external threads are arranged on the outer side of the inner screw, a driving hole is arranged at the upper end of the inner screw, and meshing internal threads are arranged inside the meshing expansion wing type fixing sheath. And a fixed expansion wing is arranged on the outer side of the meshed expansion wing type fixed sheath which is meshed and matched with the meshed external thread on the inner screw. The inner screw is provided with the inner six-petal plum blossom driving hole, so that the screw can be conveniently implanted in an operation; the inner screw is used in cooperation with the spraying wing type fixation, so that the cutting effect of external threads of the screw on tendons or ligaments when the screw is independently used is greatly improved, and tissue of a human body is effectively protected; and the screw can bear higher compression force, so that a better operation effect is ensured.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to an engaging sheath type fixing screw. Background Art

[0002] In the medical field, fixation screws are a commonly used instrument, often used to fix ligaments or tendons to help restore some tissues of the human body.

[0003] In the prior art, there is generally a compressive force on the ligaments or tendons, so during the operation, the screws are often required to be able to withstand a large compressive force, but the existing surgical screws often do not meet the requirements. In actual medical treatment, screw implantation is not convenient enough, and there are many postoperative problems in the postoperative recovery, including instability, screw withdrawal and other problems, which affect the postoperative recovery effect of human tissues. Utility Model Content

[0004] In order to solve the problems of bone anchors in the above-mentioned prior art, the utility model provides an engaging wing sheath type fixing screw, the inner screw has an inner six-petal plum blossom drive hole, which cooperates with instruments to complete the internal drive when the inner screw is implanted; the inner screw is used in conjunction with the spray-engaged wing type fixation, and a fixed expansion wing is arranged on the fixing sheath to achieve a better fixation effect, while preventing the screw from backing out, thereby ensuring the effect of the operation.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] As shown in the accompanying drawings, the utility model provides an engaging wing sheath type fixing screw, comprising an inner screw and an engaging expansion wing type fixing sheath, the outer side of the inner screw is arranged with an engaging external thread, the upper end of the inner screw is provided with a driving hole, the inside of the engaging expansion wing type fixing sheath is arranged with an engaging internal thread, which is engaged with the engaging external thread on the inner screw, and the outer side of the engaging expansion wing type fixing sheath is arranged with a fixed expansion wing.

[0007] The above-mentioned meshing wing sheath type fixing screw, the driving hole is an inner six-petal plum blossom type driving hole.

[0008] The above-mentioned meshing wing sheath type fixing screw, the meshing expansion wing type fixing sheath has a conical structure in appearance.

[0009] In the above-mentioned meshing wing sheath type fixing screw, the fixing expansion wing and the meshing expansion wing type fixing sheath are an integrated structure.

[0010] In the above-mentioned meshing wing sheath type fixing screw, the fixing expansion wings are staggeredly arranged in three layers on the side wall of the meshing expansion wing type fixing sheath.

[0011] In the above-mentioned meshing wing sheath type fixing screw, three fixing expansion wings are evenly arranged in each layer along the circumference of the meshing expansion wing type fixing sheath.

[0012] The meshing sheath type fixing screw has anti-slip grooves on the outer side surface of the fixed expansion wing.

[0013] The meshing sheath type fixing screw mentioned above, the size of the inner screw is set to 5mm-10mm.

[0014] Preferably, the size of the inner screw is one specification per 1 mm, i.e. 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm.

[0015] The above-mentioned meshing wing sheath type fixing screw, the size of the meshing expansion wing type fixing sheath is set to 6mm-11mm.

[0016] Preferably, the size of the meshing expansion wing-type retaining sheath is specified in 1 mm increments, i.e., 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, and 11 mm.

[0017] The beneficial effects of the utility model are as follows: the meshing wing sheath type fixing screw described in the present application has an inner screw with an inner six-petal plum blossom drive hole, which cooperates with instruments to complete the internal drive when the inner screw is implanted, and facilitates the implantation of the screw during surgery; the inner screw is used in conjunction with the spray-engaged wing type fixation, which greatly improves the cutting effect of the outer thread of the screw on the tendon or ligament when the screw is used alone, and effectively protects the body's tissue; a fixed expansion wing is provided on the fixing sheath, which will be squeezed and retracted by the ligament or tendon during pre-implantation. When the screw is screwed in under the premise that the fixed expansion wing is squeezed and retracted in advance, it can withstand higher compression force, thereby achieving better fixation, and at the same time preventing screw withdrawal, thereby ensuring the effect of the operation; the screw structure is simple and reasonable in design, and has extremely high medical value for operations on ligaments and tendons. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the inner screw of the utility model;

[0020] Figure 2 for Figure 1 Sectional view along the center line BB;

[0021] Figure 3 It is a top view of the inner screw of the utility model;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the meshing expansion wing type fixed sheath of the utility model;

[0023] Figure 5 It is a front view of the meshing expansion wing type retaining sheath of the utility model;

[0024] Figure 6 A bottom view of the utility model of the meshing expansion wing type retaining sheath;

[0025] Figure 7 for Figure 5 Sectional view along centerline AA.

[0026] 1. Engage with expansion wing type fixing sheath, 11. Fix the expansion wing, 12. Engage with internal thread, 2. Internal screw, 21. Engage with external thread, 22. Drive hole. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] [Example 1]

[0029] As shown in the accompanying drawings, the utility model provides an engaging wing sheath type fixing screw, comprising an inner screw 2 and an engaging expansion wing type fixing sheath 1, the outer side of the inner screw 2 is provided with an engaging external thread 21, the upper end of the inner screw 2 is provided with a driving hole 22, the inside of the engaging expansion wing type fixing sheath 1 is provided with an engaging internal thread 12, which is engaged with the engaging external thread 21 on the inner screw 2, and the outer side of the engaging expansion wing type fixing sheath 1 is provided with a fixed expansion wing 11.

[0030] Furthermore, the driving hole 22 of the inner screw 2 is an inner six-petal plum blossom-shaped driving hole, which cooperates with the instrument to complete the internal driving of the inner screw 2 during implantation, and effectively supports the implantation of the screw during surgery.

[0031] Furthermore, the meshing expansion wing-type fixing sheath 1 has a conical structure in appearance, which effectively matches the design size of the inner screw 2.

[0032] Furthermore, the fixed expansion wing 11 and the meshing expansion wing type fixed sheath 1 are an integrated structure.

[0033] Furthermore, the fixed expansion wings 11 are staggeredly arranged in three layers on the side wall of the meshing expansion wing type fixed sheath 1 .

[0034] Furthermore, each layer of the fixed expansion wings 11 is evenly arranged with three along the circumference of the meshing expansion wing type fixing sheath 1 to achieve 360° fixation of the ligament. There are three layers of nine expansion fixing wings designed above and below. When the meshing expansion wing type fixing sheath 1 is pre-implanted, the fixed expansion wings 11 are squeezed inward by the ligament or tendon, and an engaging internal thread 12 structure cooperating with the inner screw 2 is designed at the inner wall of the meshing expansion wing type fixing sheath 1. When the inner screw 2 is screwed in, the engaging external thread 21 of the inner screw 2 is meshed with the engaging internal thread 12 at the inner wall of the meshing expansion wing type fixing sheath 1, so that the inner screw 2 is screwed into the meshing expansion wing type fixing sheath 1 step by step according to the number of layers of the fixed expansion wings 11, effectively preventing the occurrence of screw withdrawal.

[0035] Furthermore, anti-slip grooves are arranged on the outer side surfaces of the fixed expansion wings 11 .

[0036] Furthermore, the size of the inner screw 2 is 5 mm.

[0037] Furthermore, the size of the meshing expansion wing type retaining sheath 1 is 6 mm.

[0038] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. An engaging sheath type fixing screw, characterized in that: The invention comprises an inner screw (2) and a meshing expansion wing type fixing sheath (1), wherein the outer side of the inner screw (2) is provided with a meshing external thread (21), and a driving hole (22) is provided at the upper end of the inner screw (2). The meshing expansion wing type fixing sheath (1) is provided with a meshing internal thread (12) which meshes with the meshing external thread (21) on the inner screw (2), and the outer side of the meshing expansion wing type fixing sheath (1) is provided with a fixing expansion wing (11).

2. The meshing sheath type fixing screw according to claim 1, characterized in that: The driving hole (22) of the inner screw (2) is an inner six-petal plum blossom-shaped driving hole.

3. The meshing sheath type fixing screw according to claim 1, characterized in that: The meshing expansion wing type fixing sheath (1) has a conical structure in appearance.

4. The meshing sheath type fixing screw according to claim 1, characterized in that: The fixed expansion wing (11) and the meshing expansion wing type fixed sheath (1) are an integrated structure.

5. The meshing sheath type fixing screw according to claim 1 or 4, characterized in that: The fixed expansion wings (11) are staggeredly arranged in three layers on the side wall of the meshing expansion wing type fixed sheath (1).

6. The meshing sheath type fixing screw according to claim 5, characterized in that: Three fixed expansion wings (11) are evenly arranged in each layer along the circumference of the meshing expansion wing type fixed sheath (1).

7. The meshing sheath type fixing screw according to claim 1, characterized in that: Anti-slip grooves are arranged on the outer side surface of the fixed expansion wing (11).

8. The meshing sheath type fixing screw according to claim 1, characterized in that: The size of the inner screw (2) is set to 5 mm-10 mm.

9. The meshing sheath type fixing screw according to claim 1, characterized in that: The size of the meshing expansion wing type retaining sheath (1) is set to 6mm-11mm.

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