Bone screw for pelvis

Abstract

The utility model discloses a bone screw for pelvis, and particularly relates to the technical field of bone screws, the bone screw comprises a first screw, a first plug-in groove is arranged in the first screw, a second screw is in threaded connection with the interior of the first plug-in groove, the first screw comprises a first base material layer, a first anti-corrosion layer is arranged outside the first base material layer, and a second anti-corrosion layer is arranged outside the second base material layer. The first screw comprises a first base material layer, the second screw comprises a second base material layer, a second anti-corrosion layer is arranged outside the second base material layer, and the first anti-corrosion layer and the second anti-corrosion layer are anti-corrosion layers formed by coating bioactive substances on the surfaces of the first base material layer and the second base material layer. By means of the second anti-corrosion layer and the first anti-corrosion layer, the first screws and the second screws can have the anti-corrosion capacity, adverse reactions between the first screws and surrounding tissues and between the second screws and surrounding tissues are reduced, the service life of the first screws and the service life of the second screws are prolonged, the first screws can be fixed together through the fixing mechanism, and the service life of the first screws is prolonged. And the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of bone screw technology, specifically to a bone screw for the pelvis. Background Technology

[0002] Orthopedics is one of the most common departments in major hospitals. It mainly studies the anatomy, physiology and pathology of the musculoskeletal system and uses drugs, surgery and physical methods to maintain and develop the normal shape and function of this system. With the changes of the times and society, the spectrum of orthopedic injuries and diseases has changed significantly. For example, diseases such as bone and joint tuberculosis, osteomyelitis and polio have decreased significantly, while trauma caused by traffic accidents has increased significantly. In orthopedic surgery, the traditional method of fracture treatment is to directly press bone screws or bone screws with a plate fixation system onto the bone to align and stabilize the fracture site.

[0003] For example, Chinese patent application CN208511155U discloses a pelvic bone screw, which includes an inner screw, an outer screw head, an inner screw head, an outer screw end, an inner screw fixing groove, and a stop. The outer screw head has an outer screw end, and the outer screw end has an inner screw fixing groove and a hexagonal countersunk hole. The hexagonal countersunk hole is located outside the inner screw fixing groove. The inner screw is fitted inside the outer screw head. One end of the inner screw is provided with an inner screw head, which is located in the inner screw fixing groove. A stop is provided inside the outer screw head, and the inner screw passes through the stop. The outer screw head has a smooth section and a threaded section around its periphery. The smooth section is located between the outer screw end and the threaded section. This technical solution utilizes a pelvic bone screw assembly consisting of an internal screw, an external screw base, a stop block, the end of the external screw base, and the head of the internal screw. This allows for pre-drilling before screwing in, increasing the screw's fixation strength and preventing loosening due to insufficient tightening. The internal hexagonal countersunk hole prevents discomfort caused by patient movement, reducing postoperative pain. The connecting wire and perforation at the end of the external screw base allow for quick connection of the wire to the bone screw during surgery, making clinical use more convenient, shortening operation time, and reducing patient discomfort. Therefore, it is highly practical and suitable for widespread adoption.

[0004] However, the following problems still exist in this technical solution: the screws in this technical solution are inside the patient's body for a long time, and the screws are prone to corrosion, which may have adverse effects on the patient's body. Utility Model Content

[0005] The purpose of this invention is to provide a bone screw for the pelvis. Through the second anti-corrosion layer and the first anti-corrosion layer, the first and second screws can be made corrosion resistant, reducing adverse reactions between the first and second screws and surrounding tissues, and extending the service life of the first and second screws. In addition, through the fixing mechanism, multiple first screws can be fixed together, improving the practicality of this invention and solving the above-mentioned shortcomings in the technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pelvic bone screw, comprising a first screw, wherein a first insertion groove is provided inside the first screw, and a second screw is threadedly connected inside the first insertion groove; the first screw comprises a first substrate layer, and a first anti-corrosion layer is provided outside the first substrate layer; the second screw comprises a second substrate layer, and a second anti-corrosion layer is provided outside the second substrate layer.

[0007] Preferably, both the first substrate layer and the second substrate layer are made of titanium alloy material to improve the strength of the first screw and the second screw.

[0008] Preferably, both the first and second anti-corrosion layers are formed by coating bioactive substances onto the surfaces of the first and second substrate layers, which are used to make the first and second screws corrosion resistant and avoid affecting the patient's body.

[0009] Preferably, a hexagonal nut is fixed to the outside of the first screw to drive the first screw to rotate.

[0010] Preferably, steel wires are provided on both sides of the first screw for connecting multiple first screws together.

[0011] Preferably, the first screw has a fixing mechanism on both sides for fixing the steel wire. The fixing mechanism includes a first threaded hole at both ends of the steel wire, a second insertion groove on both sides of the top of the first screw, and a second threaded hole on both sides of the first threaded hole. The first threaded hole and the second threaded hole are connected to the same bolt. The steel wire is adapted to the second insertion groove for fixing the steel wire.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0013] 1. Use a surgical screwdriver to turn the hexagonal nut. First, turn the first screw into the position where the bone needs to be fixed. Then, use a surgical Phillips screwdriver to tighten the second screw, so that the second screw goes deep into the bone and strengthens the fixation effect.

[0014] 2. In this utility model, the first anti-corrosion layer and the second anti-corrosion layer are both formed by coating bioactive substances on the surface of the first substrate layer and the second substrate layer. Coating with bioactive substances can improve the biocompatibility of the first screw and the second screw, and may also provide a certain degree of corrosion resistance. This treatment method can promote the growth and healing of bone tissue, while reducing the adverse reactions between the first screw and the second screw and the surrounding tissue, and extending the service life of the first screw and the second screw.

[0015] 3. Insert both ends of the steel wire into the two second insertion slots on the two first screws respectively, and then rotate the bolt to rotate it into the first threaded hole and the second threaded hole. Use the bolt to fix the steel wire to the first screw. This utility model can fix multiple first screws together through the fixing mechanism, thereby improving the practicality of this utility model. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a front view of the present invention;

[0018] Figure 2 This is a bottom view of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the present invention, showing the second screw rotating out from inside the first screw.

[0020] Figure 4 This is a schematic diagram of the structure of the first insertion slot of this utility model;

[0021] Figure 5 This is a cross-sectional view of the first screw and the second screw of this utility model;

[0022] Figure 6 This is a schematic diagram of the fixing mechanism of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of multiple first screws connected together in this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First screw; 101. First substrate layer; 102. First anti-corrosion layer;

[0026] 2. Second screw, 201. Second substrate layer, 202. Second anti-corrosion layer

[0027] 3 First insertion slot, 4 Hexagonal nut, 5 Steel wire;

[0028] 6. Fixing mechanism, 601 first threaded hole, 602 second threaded hole, 603 second insertion slot, 604 bolt. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] This utility model provides, for example Figure 1-7 The pelvic bone screw shown includes a first screw 1, a first insertion groove 3 is provided inside the first screw 1, and a second screw 2 is threadedly connected inside the first insertion groove 3. The first screw 1 includes a first base material layer 101 and a first anti-corrosion layer 102 is provided outside the first base material layer 101. The second screw 2 includes a second base material layer 201 and a second anti-corrosion layer 202 is provided outside the second base material layer 201. A hexagonal nut 4 is fixedly provided on the outside of the first screw 1.

[0031] By turning the hexagonal nut 4 with a surgical screwdriver, the first screw 1 is first turned into the position where the bone needs to be fixed. Then, the second screw 2 is tightened with a surgical Phillips screwdriver, so that the second screw 2 goes deep into the bone and strengthens the fixation effect.

[0032] like Figure 5 As shown, the first substrate layer 101 and the second substrate layer 201 are both made of titanium alloy. The titanium alloy material in this invention has good toughness and fracture resistance, good tissue compatibility, and an elastic modulus close to that of bone, which extends the service life of the first screw 1 and the second screw 2 and improves the practicality of this invention.

[0033] like Figure 5 As shown, the first anti-corrosion layer 102 and the second anti-corrosion layer 202 are both anti-corrosion layers formed by coating bioactive substances onto the surfaces of the first substrate layer 101 and the second substrate layer 201. In this invention, the bioactive substances coated on the surfaces of the first substrate layer 101 and the second substrate layer 201 can improve the biocompatibility of the first screw 1 and the second screw 2, and may also provide a certain degree of corrosion resistance. This treatment method can promote the growth and healing of bone tissue, while reducing adverse reactions between the first screw 1 and the second screw 2 and the surrounding tissues, and extending the service life of the first screw 1 and the second screw 2.

[0034] like Figure 1-7As shown, the first screw 1 has steel wires 5 on both sides, and a fixing mechanism 6 for fixing the steel wires 5 is provided on both sides of the first screw 1. The fixing mechanism 6 includes a first threaded hole 601 opened at both ends of the steel wire 5. A second insertion groove 603 is opened on both sides of the top of the first screw 1. A second threaded hole 602 is opened on both sides of the first threaded hole 601. The first threaded hole 601 and the second threaded hole 602 are connected to the same bolt 604. The steel wire 5 is adapted to the second insertion groove 603.

[0035] The two ends of the steel wire 5 are respectively inserted into the two second insertion slots 603 on the two first screws 1. Then, the bolt 604 is rotated to the first threaded hole 601 and the second threaded hole 602. The steel wire 5 is fixed on the first screws 1 by the bolt 604. The present invention can fix multiple first screws 1 together through the fixing mechanism 6, thereby improving the practicality of the present invention.

[0036] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pelvic bone screw, comprising a first screw (1), characterized in that: The first screw (1) has a first insertion groove (3) inside, and a second screw (2) is threaded inside the first insertion groove (3); The first screw (1) includes a first substrate layer (101), and a first anti-corrosion layer (102) is provided on the outside of the first substrate layer (101); The second screw (2) includes a second substrate layer (201), and a second anti-corrosion layer (202) is provided on the outside of the second substrate layer (201); The first anti-corrosion layer (102) and the second anti-corrosion layer (202) are both anti-corrosion layers formed by coating bioactive substances on the surface of the first substrate layer (101) and the second substrate layer (201).

2. The pelvic bone screw according to claim 1, characterized in that: Both the first substrate layer (101) and the second substrate layer (201) are made of titanium alloy.

3. The pelvic bone screw according to claim 1, characterized in that: The first screw (1) is externally fixed with a hexagonal nut (4).

4. A pelvic bone screw according to claim 1, characterized in that: The first screw (1) has steel wires (5) on both sides.

5. A pelvic bone screw according to claim 4, characterized in that: The first screw (1) is provided with fixing mechanisms (6) on both sides for fixing the steel wire (5); The fixing mechanism (6) includes a first threaded hole (601) at both ends of the steel wire (5), a second insertion groove (603) on both sides of the top of the first screw (1), a second threaded hole (602) on both sides of the first threaded hole (601), and the same bolt (604) is threaded inside the connected first threaded hole (601) and second threaded hole (602).

6. A pelvic bone screw according to claim 5, characterized in that: The steel wire (5) is adapted to the second insertion slot (603).

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