Door nail system for supporting distal radius watershed bone block

Abstract

The utility model discloses a door nail system for supporting a distal radius watershed bone block. The door nail system comprises a fixing steel plate, a plurality of U-shaped kirschner wires, a plurality of forcing screws and a plurality of fixing screws. The fixed steel plate comprises a head part, a middle part and a tail part; a plurality of first kirschner wire holes and a plurality of first screw holes are formed in the head part in a penetrating manner; a plurality of second screw holes are formed in the fixing steel plate from the middle to the tail in the vertical direction at intervals, and each fixing bolt penetrates through one second screw hole to fix the fixing steel plate to the radius of the human body; the two vertical ends of each U-shaped kirschner wire penetrate through the two first kirschner wire holes and are driven into the far end of the radius of the human body, the middles of the two vertical ends of each U-shaped kirschner wire are bent, and the bent U-shaped transverse end is fixedly connected into one first screw hole through a forcing screw. According to the utility model, the problem of distal fracture recovery and fixation of the radius'watershed 'can be solved, and the distal end of the radius obtains the pressure close to the wrist joint, so that the effective, lasting and firm fracture fixation effect is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic fixation instruments, in particular to a door nail system for supporting a watershed bone block at the distal end of a radius. Background Art

[0002] Distal radius fractures are fractures within 3 cm of the distal radius articular surface, often involving the radiocarpal and distal radioulnar joints. They account for approximately 18% of total body fractures and are the most common type of upper limb fracture, often occurring in young people and those over 60 years old. The principle of clinical treatment is to restore the flatness of the wrist joint surface, maintain and stabilize its anatomical reduction, and protect wrist function. Unstable fractures generally refer to fractures in which more than 1 / 2 of the dorsal or volar cortex is comminuted, and manual reduction has failed, with radial shortening greater than 3 mm, a dorsal tilt angle greater than 10°, volar instability, instability of the distal radioulnar joint, and a step-off greater than 2 mm on the articular surface. Surgery is the preferred treatment for unstable fractures. By incising the fracture ends, identifying anatomical landmarks, and performing reduction, the flatness of the radiocarpal joint surface is restored, and the effectiveness of reduction and reliability of fixation are maintained. These are the key points and difficulties of the surgery. The palmar radial "watershed line" is the most crucial anatomical landmark during surgery. It's the line connecting the most prominent transverse bone ridges on the palmar distal radius, the theoretically most convex line on the palmar distal radius. It's the attachment point for the wrist capsule / ligaments and pronator quadratus muscles, with the flexor tendons passing superficially. The "watershed line" is the furthest limit for traditional plate placement. However, for cases of severe comminuted fractures involving the radiocarpal joint surface, traditional plates are unable to effectively fix fractures distal to the "watershed line," resulting in poor surgical outcomes and even the serious consequences of flexor tendon irritation, wear, or rupture. To address these technical issues, we provide a door nail system for supporting the distal radial watershed bone block. Summary of the Invention

[0003] The utility model provides a door nail system for supporting the watershed bone block at the distal end of the radius, which can solve the problem of fracture repair and fixation beyond the "watershed" of the radius. A row of U-shaped Kirschner wires are inserted into the wrist joint of the distal radius, and fixed with pressure bolts after bending, so that the pressure of the distal radius is pushed against the wrist joint, thereby achieving an effective, long-lasting and firm fracture fixation effect.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A door nail system for supporting the watershed bone block of the distal radius, comprising a fixing steel plate, a plurality of U-shaped Kirschner wires, a plurality of compression screws and a plurality of fixing screws; the fixing steel plate comprises a head, a middle part and a tail part, the head part is provided with a plurality of first Kirschner wire holes and a plurality of first screw holes which are opened through the head part, the plurality of first Kirschner wire holes are arranged in a first row at intervals along the transverse direction of the fixing steel plate, and the plurality of first screw holes are arranged in a second row on the vertical lower side of the plurality of first Kirschner wire holes; a plurality of second screw holes are arranged in a vertical interval from the middle part to the tail part of the fixing steel plate, and each of the fixing screws passes through a second screw hole to fix the fixing steel plate on the human radius; the two vertical ends of each of the U-shaped Kirschner wires pass through two of the first Kirschner wire holes and are driven into the distal end of the human radius, the two vertical ends of each of the U-shaped Kirschner wires are bent in the middle part, and after bending, the U-shaped horizontal end is fixedly connected to a first screw hole by a compression screw.

[0006] Furthermore, the head, middle and tail of the fixing plate are curved according to the curvature of the distal radius of the human skeleton, and the angle between the opening direction of the first Kirschner wire hole and the bottom end surface of the fixing plate is set to be approximately 40°.

[0007] Furthermore, a plurality of second Kirschner wire holes are provided at the upper end of the fixing steel plate, and the plurality of second Kirschner wire holes are arranged side by side in an alternating manner with the plurality of first screw holes; the angle between the opening direction of the second Kirschner wire holes and the bottom end surface of the fixing steel plate is set to be approximately 60°.

[0008] Furthermore, the nut flange of the pressure screw has a circular structure, and the nut flange extends outward in the radial direction of the pressure screw.

[0009] Furthermore, the second screw holes are all universal screw holes.

[0010] Furthermore, the fixing steel plate is provided with a plurality of third screw holes below the first screw holes.

[0011] Furthermore, the first screw hole and the third screw hole are both configured as locking threaded holes.

[0012] The beneficial effects of the utility model are:

[0013] The utility model is mainly used to solve the problem of fracture repair and fixation of radius distal to the "watershed". The fixation plate is placed in the safe area proximal to the "watershed". The U-shaped Kirschner wire is inserted through the first row of first Kirschner wire holes at the upper end of the fixation plate to fix the distal fracture fragment. The shape and length of the U-shaped Kirschner wire can be prefabricated according to certain specifications, or the existing Kirschner wire can be flexibly adjusted and bent according to the specific fracture situation. The U-shaped horizontal end and the vertical end of the U-shaped Kirschner wire are bent, and the U-shaped horizontal end is initially fixed to the first position in a suitable position by a pressure screw. In the screw hole, multiple U-shaped Kirschner wires can form a "door nail" system to effectively support the distal radius articular surface. The U-shaped transverse end of the U-shaped Kirschner wire is re-pressurized and fixed by the compression screw, so that the U-shaped Kirschner wire can form a lever during the compression process. When the U-shaped transverse end is pressurized, the two vertical ends of the U-shaped Kirschner wire can have a pressure applied to the distal radius, so that the distal radius articular surface has a pressure tending to the wrist joint. Compared with the traditional fixation method of the radius fixation plate, it has a more effective, longer-lasting and stronger fracture fixation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a further detailed description of the specific embodiments of the present invention with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram of the structure of the utility model during use;

[0016] Figure 2 This is a schematic diagram of the structure of the fixed steel plate, U-shaped Kirschner wire and compression screw when they are installed in the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the fixed steel plate in the utility model;

[0018] Figure 4 This is a schematic structural diagram of a U-shaped Kirschner wire in the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the pressure screw in the utility model;

[0020] Figure ID:

[0021] 1-fixation plate, 2-U-shaped Kirschner wire, 3-compression screw, 4-fixation screw, 11-first Kirschner wire hole, 12-first screw hole, 13-second screw hole, 14-second Kirschner wire hole, 15-the third screw hole. DETAILED DESCRIPTION

[0022] 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.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. When a component is referred to as being "set in the middle", it does not only mean being set in the exact middle position, but also means being within the range defined by the middle as long as both ends are not set. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Reference Figures 1 to 4As shown, a door nail system for supporting the watershed bone block of the distal radius includes a fixing plate 1, a plurality of U-shaped Kirschner wires 2, a plurality of compression screws 3 and a plurality of fixing screws 4; the fixing plate 1 includes a head, a middle part and a tail, the head is provided with a plurality of first Kirschner wire holes 11 and a plurality of first screw holes 12 set through, the plurality of first Kirschner wire holes 11 are arranged in a first row at intervals along the fixing plate 1, and the plurality of first screw holes 12 are arranged vertically downward on the plurality of first Kirschner wire holes 11. Arranged in a second row; a plurality of second screw holes 13 are vertically spaced from the middle to the tail of the fixing steel plate 1, and each of the fixing screws 4 passes through a second screw hole 13 to fix the fixing steel plate 1 on the human radius; the two vertical ends of each of the U-shaped Kirschner wires 2 pass through two of the first Kirschner wire holes 11 and are driven into the distal end of the human radius, and the middle part of the two vertical ends of each of the U-shaped Kirschner wires 2 is bent, and after bending, the U-shaped horizontal end is fixedly connected to one of the first screw holes 22 through a pressure screw 3. The utility model is mainly used to solve the problem of fracture repair and fixation of radius distal to the "watershed". The fixing plate 1 is placed in the safe area proximal to the "watershed". The U-shaped Kirschner wire 2 is inserted through the first row of first Kirschner wire holes at the upper end of the fixing plate 1 to fix the distal fracture fragment. The shape and length of the U-shaped Kirschner wire 2 can be prefabricated according to certain specifications, or the existing Kirschner wire can be flexibly adjusted and bent according to the specific fracture situation. The U-shaped horizontal end and the vertical end of the U-shaped Kirschner wire 2 are bent, and the U-shaped horizontal end is initially fixed in a suitable position by a pressure screw 3. In the first screw hole 12, multiple U-shaped Kirschner wires 2 are distributed side by side to form a "door nail" system, which effectively supports the joint surface. The U-shaped transverse end of the U-shaped Kirschner wire is pressurized and fixed again by the compression screw, so that the U-shaped Kirschner wire can form a lever during the pressurization process. When the U-shaped transverse end is pressurized, the two vertical ends of the U-shaped Kirschner wire can have a pressure applied to the distal end of the radius, so that the joint surface of the distal radius has a pressure tending to the wrist joint. Compared with the traditional fixation method of the radius fixation plate, it has a more effective, longer-lasting and stronger fracture fixation effect.

[0026] The head, middle, and tail of the fixed steel plate are bent according to the curvature of the distal radius of the human skeleton. The fixed steel plate in the prior art is usually set with the head tilted relative to the middle part, tightly attached to the distal radius. The fixed steel plate as a whole is curved in an arc with the central axis of the middle part as the dividing line to form a C-shaped structure. The fixed steel plate 1 is made of titanium alloy material. The surgeon can manually adjust the fixed steel plate 1 according to the curvature of the human skeleton before using it. The opening direction of the first Kirschner wire hole 11 and the angle a between the bottom end face of the fixed steel plate are set to approximately 40°. The upper end of the fixed steel plate 1 is also provided with a plurality of second Kirschner wire holes 14. The plurality of second Kirschner wire holes 13 are arranged side by side with the plurality of first screw holes 12 in an interlaced manner. The opening direction of the second Kirschner wire holes and the angle b between the bottom end face of the fixed steel plate are set to approximately 60°. The first and second Kirschner wire holes 11 and 14 have slightly larger diameters than the Kirschner wires. This provides the U-shaped Kirschner wires with sufficient space to apply force when the pressure bolt is tightened. Furthermore, the first and second Kirschner wire holes are at different angles, guiding the double-row U-shaped Kirschner wires 2 to be inserted in parallel from different directions, forming intersections at different angles and providing multi-dimensional support for the joint surface. The fixation plate 1 also includes several third screw holes 15 below the first screw holes. Both the first and third screw holes 12, 15 are configured as locking threaded holes.

[0027] The nut flange of the pressure screw 3 is a triangular structure, and the nut flange 31 extends outward along the radial direction of the pressure screw 3. After being tightened, the nut flange 31 can compress the tail horizontal end of the U-shaped Kirschner wire, thereby fixing the Kirschner wire and preventing it from withdrawing.

[0028] The second screw holes 13 are all universal screw holes. The second screw holes 13 cooperate with the fixing screws 4 to fix the fixing plate 1 as a whole on the radius. According to the fracture reduction situation, the fixation can be performed by driving the screws into the radius from different angles.

[0029] The use steps and principles of this utility model:

[0030] 1) Prepare an appropriate number of U-shaped Kirschner wires 2. The material of the U-shaped Kirschner wires 2 is no different from that of conventional Kirschner wires, except that they need to be prefabricated into a U-shaped structure in advance. Conventional Kirschner wires can also be bent on-site according to surgical needs.

[0031] 2) Adjust the curvature of the fixation plate 1 to basically match the curvature of the radius of the human body to achieve a close fit. Tighten and fix it with the fixation screws 4 according to the fixed position. The second screw hole 13 is a universal locking screw hole, which has space for fine adjustment of the screw insertion direction. The appropriate direction can be selected according to the fracture reduction situation. Tighten the fixation screws 4 one by one in the order from the middle to the sides to achieve pressure on the fixation plate 1.

[0032] 3) Insert U-shaped Kirschner wires 2 according to surgical needs, starting from both ends and inserting them one by one towards the middle, and bend the vertical end of each U-shaped Kirschner wire into the corresponding first screw hole. All the first row of holes are inserted with U-shaped Kirschner wires 2 to form a row-shaped fixed structure, and the horizontal end of each bent U-shaped Kirschner wire 2 is pressed against the fixed steel plate 1 by the pressure bolt 3 and pre-tightened. Several U-shaped Kirschner wires 2 support the distal radius articular surface side by side to form a door nail system; according to reinforcement needs, U-shaped Kirschner wires 2 can be continued to be inserted into the second Kirschner wire hole 14, and the tail end of this row of U-shaped Kirschner wires 2 is fixed and pressurized by the pressure bolt 3 to form a second row of door nails; the angles of the first Kirschner wire hole 11 and the second Kirschner wire hole 14 are different, which guides the double row of U-shaped Kirschner wires 2 to be inserted in parallel in different directions, forming intersections at different angles, and can support the articular surface in multiple dimensions.

[0033] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A door nail system for supporting the distal radius watershed bone block, characterized in that: It includes a fixing steel plate, a plurality of U-shaped Kirschner wires, a plurality of pressure screws and a plurality of fixing screws; the fixing steel plate includes a head, a middle part and a tail part, the head part is provided with a plurality of first Kirschner wire holes and a plurality of first screw holes which are opened through the head part, the plurality of first Kirschner wire holes are arranged in a first row at intervals along the horizontal direction of the fixing steel plate, and the plurality of first screw holes are arranged in a second row on the vertical lower side of the plurality of first Kirschner wire holes; a plurality of second screw holes are arranged in a vertical interval from the middle part to the tail part of the fixing steel plate, and each of the fixing screws passes through a second screw hole to fix the fixing steel plate on the human radius; the two vertical ends of each of the U-shaped Kirschner wires pass through two of the first Kirschner wire holes and are driven into the distal end of the human radius, the two vertical ends of each of the U-shaped Kirschner wires are bent in the middle part, and after bending, the U-shaped horizontal end is fixedly connected to a first screw hole by a pressure screw.

2. A door nail system for supporting the distal radius watershed bone block according to claim 1, characterized in that: The head, middle and tail of the fixing steel plate are curved according to the curvature of the distal radius of the human skeleton, and the angle between the opening direction of the first Kirschner wire hole and the bottom end surface of the fixing steel plate is set to be approximately 40°.

3. A door nail system for supporting the distal radius watershed bone block according to claim 1, characterized in that: The upper end of the fixing steel plate is also provided with a plurality of second Kirschner wire holes, which are arranged side by side with the plurality of first screw holes in an alternating manner; the angle between the opening direction of the second Kirschner wire holes and the bottom end surface of the fixing steel plate is set to be approximately 60°.

4. A door nail system for supporting the distal radius watershed bone block according to claim 1, characterized in that: The nut flange of the pressure screw is a circular structure, and the nut flange extends outward in the radial direction of the pressure screw.

5. A door nail system for supporting the distal radius watershed bone block according to claim 1, characterized in that: The second screw holes are all universal screw holes.

6. A door nail system for supporting the distal radius watershed bone block according to claim 3, characterized in that: The fixing steel plate is further provided with a plurality of third screw holes below the first screw holes.

7. A door nail system for supporting the distal radius watershed bone block according to claim 6, characterized in that: The first screw hole and the third screw hole are both configured as locking threaded holes.

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