Acetabulum quadrilateral nail rod composite fixing device

Abstract

The utility model discloses an acetabulum quadrilateral body nail rod composite fixing device which comprises a composite fixing assembly installed on an acetabulum quadrilateral body bone A, a main body steel plate attached to the surface of the acetabulum quadrilateral body bone A, cortical bone screws penetrating through the main body steel plate and implanted into the acetabulum quadrilateral body bone A, and a limiting elastic plate installed in the main body steel plate. The main body steel plate comprises a connecting part and a circular ring part; when a fractured acetabular quadrilateral bone A is compositely fixed, the shape of the main body steel plate is tightly attached to the surface of the acetabular quadrilateral bone A, cortical bone screws are implanted into the acetabular quadrilateral bone A to firmly fix the main body steel plate, and the main body steel plate fixes the acetabular quadrilateral bone A through the bridging steel plate and the blocking screws instead of being fixed through the screws, so that the bone can be protected; the acetabulum quadrilateral bone A can be prevented from being damaged by thread cutting, the blocking screw can block the acetabulum quadrilateral bone A and avoid displacement of the acetabulum quadrilateral bone A, and the polished rod screw blocks the blocking screw and avoid displacement and instability of the blocking screw.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite fixation devices for medical orthopedic fractures, and particularly relates to an acetabulum quadrilateral screw-rod composite fixation device. Background Art

[0002] Acetabular fractures caused by high-energy trauma are common in hospital orthopedics departments. Besides simple anterior and posterior wall fractures, other types of acetabular fractures may involve the quadrilateral region. Fractures involving the quadrilateral region are often comminuted and accompanied by displacement of the fracture fragments into the pelvis. Severe cases can even result in central dislocation of the hip joint. Currently, open reduction and internal fixation are often recommended clinically to restore the head-acetabulum alignment of the hip joint, thereby promoting functional recovery of the patient's hip joint after surgery. However, due to the extremely irregular anatomy of the acetabulum, its deep location, the numerous vital blood vessels and nerves surrounding it, the weak quadrilateral bone, and its close proximity to the femoral head, placement of internal fixation in this area is difficult. Careless placement of the screws in this area can lead to serious complications such as misplaced screws in the joint. Placing the internal fixation away from the fracture line significantly weakens the fixation strength.

[0003] Acetabular quadrilateral fractures often displace posteriorly and inferiorly while displacing into the pelvis. Conventional treatments for acetabular fracture reduction and fixation often suffer from shortcomings such as a single fulcrum, limited fixation effect and range, poor correction of fracture separation, and insufficient resistance to fracture fragment rotation. Furthermore, most researchers leave the holes in the quadrilateral plate blank when placing screws around the acetabulum to avoid serious complications such as screws entering the joint by mistake, thus losing the ability to directly fix the quadrilateral fracture.

[0004] In the existing orthopedics treatment of acetabular quadrilateral fractures, there is a problem of a design that cannot prevent the displacement of the acetabular quadrilateral bone. Therefore, the present application proposes an acetabular quadrilateral screw-rod composite fixation device. Utility Model Content

[0005] The purpose of the present invention is to provide an acetabular quadrilateral screw-rod composite fixation device to solve the problem in the above background technology that the design fails to prevent the displacement of the acetabular quadrilateral bone.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: a quadrilateral screw-rod composite fixation device for acetabulum, comprising

[0007] A composite fixation assembly mounted on the acetabular quadrilateral bone A comprises a main steel plate adhered to the surface of the acetabular quadrilateral bone A, cortical bone screws penetrating the main steel plate and implanted inside the acetabular quadrilateral bone A, and a limiting spring plate mounted inside the main steel plate. The main steel plate comprises a connecting portion and a circular ring portion.

[0008] A split-type combined bridge steel plate bonded to the main steel plate, the bridge steel plate being provided with a circular steel plate and a circular protrusion integrally mounted on the inner surface of the circular steel plate;

[0009] blocking screws through the bridging plate;

[0010] A polished screw is implanted into the acetabular quadrilateral bone A.

[0011] Preferably, the bridging steel plate of the "Z"-shaped structure includes a horizontal plate a, a connecting plate b and a square plate c. The horizontal plate a and the square plate c are parallel, and the connecting plate b is perpendicular to the horizontal plate a and the square plate c.

[0012] Preferably, the circular steel plate is installed on the horizontal plate a, and screw grooves are provided on the horizontal plate a and the square plate c, and the center of the circular steel plate and the center of the corresponding screw groove are on the same axis.

[0013] Preferably, a limiting groove is provided on the surface of the annular portion, and the limiting spring plate located in the limiting groove is in a wave shape, with a wave crest of the limiting spring plate being d and a wave trough being d.

[0014] Preferably, the annular protrusion cooperates with the trough that defines the spring plate.

[0015] Preferably, the geometric shape of the main steel plate fits the surface of the acetabulum quadrilateral bone A.

[0016] Preferably, the outer surface of the cortical bone screw is provided with threads, and the blocking screw is a polished rod structure with a smooth outer surface and no threads, wherein one end of the polished rod screw is a polished rod and the other end is a threaded rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] In the present invention, when composite fixation is performed on the fractured acetabular quadrilateral bone A, the shape of the main steel plate fits tightly with the surface of the acetabular quadrilateral bone A, and the cortical bone screw is implanted into the acetabular quadrilateral bone A to firmly fix the main steel plate. The main steel plate is fixed to the acetabular quadrilateral bone A by a bridging steel plate in combination with a blocking screw rather than a screw, thereby protecting the bone and preventing thread cutting from damaging the bone. The blocking screw can block the acetabular quadrilateral bone A to prevent it from shifting, and the bare rod screw blocks the blocking screw to prevent the blocking screw from shifting and becoming unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic diagram of the flattened top view of the main steel plate of the present invention;

[0021] Figure 3For the utility model Figure 2 The enlarged structural diagram of the middle part B;

[0022] Figure 4 This is a schematic cross-sectional view of the circular ring portion of the present invention;

[0023] Figure 5 This is a schematic cross-sectional view of the bridge steel plate of the present invention;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the circular steel plate of the present invention;

[0025] In the figure: 2, bridging steel plate; 3, blocking screw; 4, polished rod screw; 11, main steel plate; 12, cortical bone screw; 21, annular steel plate; 22, annular protrusion; 111, connecting part; 112, annular part; 113, limiting groove; 114, limiting spring plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example

[0028] See also Figures 1 to 6The utility model provides a technical solution: an acetabular quadrilateral screw-rod composite fixation device, comprising a composite fixation assembly installed on the acetabular quadrilateral bone A, comprising a main steel plate 11 that fits the surface of the acetabular quadrilateral bone A, a cortical bone screw 12 that penetrates the main steel plate 11 and is implanted inside the acetabular quadrilateral bone A, and a limiting spring plate 114 that is installed inside the main steel plate 11. The main steel plate 11 fits the acetabular quadrilateral bone A, and the shape of the main steel plate 11 fits tightly with the surface of the acetabular quadrilateral bone A. The main steel plate 11 is fixed to the acetabular quadrilateral bone A by an electric drill. The cortical bone screw 12 passing through the main steel plate 11 is implanted into the acetabular quadrilateral bone A to achieve the effect of firmly fixing the main steel plate 11. The main steel plate 11 includes a connecting portion 111 and an annular portion 112. The connecting portion 111 and the annular portion 112 distributed with rubber strips are integrally cast; a split-type combined bridging steel plate 2 is fitted with the main steel plate 11. The bridging steel plate 2 is combined and connected with the main steel plate 11. The bridging steel plate 2 is provided with an annular steel plate 21 and an annular protrusion 22 integrally installed on the inner surface of the annular steel plate 21. The annular steel plate 21 and the annular protrusion 22 are integrally formed and cast, and the annular steel plate 21 and the bridge steel plate 2 are welded into an integral structure. The bridge steel plate 2 is installed on the main steel plate 11. One or more bridge steel plates 2 can be used. The number and combination of the implanted positions of the bridge steel plates 2 are determined according to the intraoperative fracture and reduction conditions. The bridge steel plate 2 and the main steel plate 11 are fixed by cortical bone screws 12. When the bridge steel plate 2 is installed, the annular steel plate 21 is embedded in the interior of the main steel plate 11, and the spring plate 114 is limited to limit the annular protrusion. Start 22, thereby limiting the bridging steel plate 2, which is conducive to the installation of the bridging steel plate 2; the blocking screw 3 that passes through the bridging steel plate 2 is implanted by an electric drill, and the blocking screw 3 is made of elastic metal material, such as titanium alloy material. The blocking screw 3 can block the acetabular quadrilateral bone A to prevent it from being displaced; the light rod screw 4 implanted on the acetabular quadrilateral bone A is implanted by an electric drill, and the light rod screw 4 blocks the blocking screw 3 to prevent the blocking screw 3 from being displaced and unstable.

[0029] In this embodiment, the "Z"-shaped bridging steel plate 2 includes a horizontal plate a, a connecting plate b and a square plate c. The horizontal plate a and the square plate c are parallel, and the connecting plate b is perpendicular to the horizontal plate a and the square plate c. The circular ring steel plate 21 is installed on the horizontal plate a. The horizontal plate a and the square plate c are provided with screw grooves. The center of the circular ring steel plate 21 and the center of the corresponding screw groove are on the same axis. When the bridging steel plate 2 is installed, the circular ring steel plate 21 is embedded in the interior of the main steel plate 11, and the spring plate 114 is limited to limit the circular ring protrusion 22.

[0030] In this embodiment, a limiting groove 113 is provided on the surface of the annular portion 112, and the limiting spring plate 114 located in the limiting groove 113 is in a wave shape, the crest of the limiting spring plate 114 is d1, and the trough is d2. The annular protrusion 22 cooperates with the trough of the limiting spring plate 114, and the annular protrusion 22 acts on the limiting spring plate 114. The limiting spring plate 114 bounces, and the annular protrusion 22 is located at the crest d1 on the limiting spring plate 114. The limiting spring plate 114 limits the annular protrusion 22, thereby limiting the bridging steel plate 2, which is conducive to the installation of the bridging steel plate 2.

[0031] In this embodiment, the geometric shape of the main steel plate 11 fits the surface of the acetabular quadrilateral bone A. The main steel plate 11 fits tightly to the acetabular quadrilateral bone A and is firmly fixed.

[0032] In this embodiment, the outer surface of the cortical bone screw 12 is provided with a thread, and the blocking screw 3 is a polished rod structure with a smooth outer surface and no threads. The blocking screw 3 passes through the square plate c of the bridging steel plate 2, and the blocking screw 3 blocks the acetabular quadrilateral bone A. The main steel plate 11 fixes the acetabular quadrilateral bone A through the bridging steel plate 2 in combination with the blocking screw 3 instead of the screw, which can protect the bone and avoid thread cutting and damaging the bone. One end of the polished rod screw 4 is a polished rod and the other end is a threaded rod. The threaded rod of the polished rod screw 4 is implanted inside the acetabular quadrilateral bone A, and the exposed end of the polished rod of the polished rod screw 4 can be broken.

[0033] The working principle and use process of this utility model:

[0034] When performing composite fixation on the fractured acetabular quadrilateral bone A, the shape of the main steel plate 11 fits tightly with the surface of the acetabular quadrilateral bone A, and the cortical bone screw 12 passing through the main steel plate 11 is implanted into the acetabular quadrilateral bone A through an electric drill to achieve the purpose of firmly fixing the main steel plate 11. The main steel plate 11 fixes the acetabular quadrilateral bone A through the bridging steel plate 2 combined with the blocking screw 3 instead of screw fixation, which can protect the bone and avoid thread cutting to damage the bone. The blocking screw 3 can block the acetabular quadrilateral bone A to prevent it from shifting, and the bare rod screw 4 blocks the blocking screw 3 to prevent the blocking screw 3 from shifting and becoming unstable.

[0035] Although embodiments of the present invention have been shown and described (see the detailed description above for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acetabular quadrilateral screw-rod composite fixation device, characterized by: include A composite fixation assembly mounted on the acetabular quadrilateral bone A comprises a main steel plate (11) fitted with the surface of the acetabular quadrilateral bone A, a cortical bone screw (12) penetrating the main steel plate (11) and implanted inside the acetabular quadrilateral bone A, and a limiting spring plate (114) mounted inside the main steel plate (11); the main steel plate (11) comprises a connecting portion (111) and an annular portion (112); A split-type combined bridging steel plate (2) bonded to the main steel plate (11), the bridging steel plate (2) being provided with a circular steel plate (21) and a circular protrusion (22) integrally mounted on the inner surface of the circular steel plate (21); a blocking screw (3) extending through the bridging plate (2); A polished screw (4) is implanted into the acetabular quadrilateral bone A.

2. The acetabular quadrilateral screw-rod composite fixation device according to claim 1, characterized in that: The bridge steel plate (2) of the "Z" type structure comprises a horizontal plate a, a connecting plate b and a square plate c, wherein the horizontal plate a and the square plate c are parallel, and the connecting plate b is perpendicular to the horizontal plate a and the square plate c.

3. The acetabular quadrilateral screw-rod composite fixation device according to claim 2, characterized in that: The circular steel plate (21) is installed on the horizontal plate a. The horizontal plate a and the square plate c are provided with screw grooves. The center of the circular steel plate (21) and the center of the corresponding screw groove are on the same axis.

4. The acetabular quadrilateral screw-rod composite fixation device according to claim 1, characterized in that: A limiting groove (113) is provided on the surface of the annular portion (112), and the limiting spring plate (114) located in the limiting groove (113) is in a wave shape, with a wave crest d1 and a wave trough d2 of the limiting spring plate (114).

5. The acetabular quadrilateral screw-rod composite fixation device according to claim 4, characterized in that: The annular protrusion (22) cooperates with the trough defining the spring plate (114).

6. The acetabular quadrilateral screw-rod composite fixation device according to claim 1, characterized in that: The geometric shape of the main steel plate (11) fits the surface of the acetabulum quadrilateral bone A.

7. The acetabular quadrilateral screw-rod composite fixation device according to claim 1, characterized in that: The outer surface of the cortical bone screw (12) is provided with threads, the blocking screw (3) is a polished rod structure with a smooth outer surface and no threads, and one end of the polished rod screw (4) is a polished rod and the other end is a threaded rod.

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