Patent Description:
In the prior art, a bone fracture is divided into stable fracture and unstable fracture according to the degree of stability of the fracture end. For stable fracture, it usually was treated with manipulations and external fixation methods such as a plaster, a splint, a brace, or traction brake method, etc., are used to maintain stable fixation and achieve final healing; for unstable fracture, surgical treatment is required, including an internal fixation system and an external fixation system, and the internal fixation system is divided into a screw-plate fixation system and an intramedullary nail fixation system. However, regardless of which treatment method is adopted, large-sample follow-up studies have showed that some patients may suffer from fracture nonunion or delayed healing, with an incidence rate of up to <NUM>%.

<CIT> describes systems and methods for stabilizing and/or compressing portions of bone. In some aspects, a bone plate system may comprise a plate having a bone engaging surface. The plate may be fastened to two bone portions having a joint line therebetween. The system may also include a keel projecting from the bone engaging surface. The keel may extend into the bone portions and span the joint line when the plate is fastened to the bone portions. In some aspects, a ratio of an average thickness of the plate to an average width of the plate may be less than or equal to about <NUM>.

Further, <CIT> shows an approximately π-shaped improved bone plate structure, fixed on a bone of an animal for maintaining the relative positions of different portions of the bone. One of the other features is that the bone plate structure comprises at least one contouring portion for allowing the surgeons to intra-operatively adjusting the shape in accordance with the shape of the bone. Furthermore, the bone plate structure may fit the bone with multi-axis, decreasing stress concentration, preventing the opening portion from being unsuitably covered and preventing the wound deformation from being pressed.

<CIT> discloses a bone fixation device comprising a fixation plate having means for engaging the bone to apply force to the distal and proximal fragments of a bone in a direction extending transversely of the bone to produce a compressive force across the fracture.

For patients suffering from fracture non-healing or delayed healing who are fixed by the screw-plate fixation system, besides the infection factors, these patients can be divided into two categories of multi-callus ones and few-callus ones according to the number of calluses formed at the fracture site; and can be divided into stable type and unstable type according to the degree of stability of fracture end. For patients with stable fracture end and multiple calluses, most of them can be treated by observation; while for patients with stable fracture end and few calluses, bone grafting treatment can be adopted. But for patients with unstable fracture, regardless of multiple calluses or few calluses, it is necessary to take various ways to strengthen the stability of the fracture end to promote the gradual healing of the fracture because of local instability of fracture. However, relying on the existing clinically available internal fixation methods, it is still impossible to perfectly solve the internal fixation problems such as defects of the fracture end, or unstable fracture end, non-healing or nonunion after comminuted fracture by adopting the screw-plate system for fixation (for example, nonunion <NUM> of a bone shaft <NUM> after fracture as shown in dotted round frame in <FIG>), that is, there is no stable medical device designed specifically for nonunion and fracture non-healing. Therefore, it is urgent to develop an internal fixation apparatus, a system or a method for nonunion and non-healing after fracture.

To solve the problems of unstable fracture end, fracture non-healing or delayed healing occurring in the prior after the bone shaft fracture site is fixed using the screw-plate system, the present invention proposes a wing-shaped angle steel plate structure. By using a wing fitting portion and a body fixation portion that are connected and cooperated with each other and in close contact with a bone shaft, this wing-shaped angle steel plate can complete stable fixation of the fracture end and support the fracture end site of bone shaft internally, prevent dislocation of the fracture end and assist in the accurate positioning, reduction and healing of the fracture site. The present invention further relates to a bone shaft fixation system.

The technical solution of the present invention is as follows:
A wing-shaped angle steel plate, comprising a wing fitting portion and a body fixation portion, the wing fitting portion and the body fixation portion are fixedly connected to each other, the wing fitting portion is used for supporting a fracture end and has a structure matched with an inner side surface of a bone shaft, the body fixation portion is used for fixing the wing fitting portion and has a structure matched with a front side of the bone shaft, and the body fixation portion is provided with at least two first locking holes for passing through first locking screws at an intersection site with the wing fitting portion, and the first locking holes have angles such that the first locking screws passing therethrough can realize a close contact of the body fixation portion and the wing fitting portion with the bone shaft and realize a support to the inner side of the bone shaft, the body fixation portion is provided with at least two second locking holes for passing through a second locking screw on the structure matched with the front side of the bone shaft, and the second locking holes have angles such that the second locking screws passing therethrough can realize a close contact between the body fixation portion and the bone shaft and control rotation and axial stability of the body fixation portion.

The wing fitting portion has a structure that completely covers the fracture end.

The wing fitting portion has a structure that exposes the fracture end and supports the fracture end at a distal end and a proximal end of the fracture end, respectively.

The wing fitting portion and the body fixing portion are manufactured by an integral molding process.

The body fixing portion is further provided with at least two lateral compression holes for passing through a compression screw on the structure matched with the front side of the bone shaft, and the lateral compression holes have angles such that the compression screws passing therethrough generates pressures between the bone shaft and the wing-shaped angle steel plate.

The body fixation portion is provided with three second locking holes in the structure matched with the front side of the bone shaft, and the three second locking holes are arranged in line or in a triangle.

The body fixation portion is provided with more than four second locking holes in the structure matched with the front side of the bone shaft, and these second locking holes are arranged in line or in a polygon.

A bone shaft fixation system, comprising the foregoing wing-shaped angle steel plate, and further comprising first locking screws that pass through the first locking holes and second locking screws that pass through second locking holes for fixing the wing-shaped angle steel plate and a bone shaft lateral locking structure for fixing a fracture end, the bone shaft lateral locking structure comprises a locking steel plate and at least two third locking screws for fixing the locking steel plate, the locking steel plate having a structure matched with a lateral surface of the bone shaft, the locking steel plate is provided with at least two third locking holes for passing through the third locking screws in the structure matched with the bone shaft lateral surface, and each of the third locking screws passes through the corresponding third locking hole of the locking steel plate respectively.

The first locking screws and the second locking screws for fixing the wing-shaped angle steel plate have a diameter ranging from <NUM> to <NUM>.

The first locking screws and/or the second locking screws and/or the third locking screws are hollow locking screws or solid locking screws.

The technical effects of the present invention are as follows:
The present invention relates to a wing-shaped angle steel plate, comprising the wing fitting portion and the body fixation portion, the wing fitting portion and the body fixation portion are fixedly connected to each other and preferably can be formed integrally, the wing fitting portion is used for supporting the fracture end and has a structure matched with the inner side surface of the bone shaft, the body fixation portion is used for fixing the wing fitting portion and has a structure matched with the front side of the bone shaft, the body fixation portion is provided with at least two first locking holes for passing through the first locking screws at the intersection site with the wing fitting portion, and provided with at least two second locking holes for passing through the second locking screws are provided in the structure matched with the front side of the bone shaft. Each of the first locking holes and the second locking holes has respective specific angle to achieve a specific function in cooperation with the first locking screw and the second locking screw, respectively. In the wing-shaped angle steel plate, the wing fitting portion and the body fixation portion of the present invention are connected to each other and cooperate to fix and support the bone shaft fracture end site, thereby enhancing the stability of the fracture end and effectively ensuring and helping stable reduction and healing of the fracture site. The wing fitting portion and the body fixing portion with specific structures cooperate with the first locking holes provided with specific angles, such that the body locking portion and the wing fitting portion are in close contact with the bone shaft (i.e., the wing-shaped angle steel plate is tightly fitted with the bone shaft) after the first locking screws pass through along the direction of the first locking holes, and the support of the inner side of bone shaft can be achieved. The wing fitting portion and the body fixing portion with specific structures cooperate with the second locking holes provided with specific angles, such that a close contact of the body fixation portion with the bone shaft and control on rotation and axial stability of the body fixation portion can be achieved after the second locking screws pass through along the direction of the second locking holes. In addition, during actual uses, the first and second locking screws which can be minimally invasively implanted from the front side of the bone shaft and used to fix the wing-shaped angle steel plate are not interfered by the original fixation, especially the ingenious structure of the wing fitting portion solves the problem of minimal invasion inside the bone shaft that cannot be solved in the prior art. The incision is still made at the front side of the bone shaft, but the wing fitting portion can be extended into the inside of the bone shaft to support the fracture end, and support of the inner side of the bone shaft can be achieved through the cooperation of the first locking screw with the first locking hole provided with a specific angle, so as to further enhance the reliability of the fixation after the reduction and facilitate fracture healing.

For the wing-shaped angle steel plate proposed by the present invention, the wing fitting portion may preferably be of the structure that can completely cover the fracture end, or can be of the structure in which the fracture end is exposed and supported at a distal end and a proximal end, respectively. The specific shape and structure can be reasonably selected according to the fracture site, to cover the fracture end site, or expose the fracture end site, or cooperate with the fracture end site while supporting and stabilizing the fracture end, so as to accelerate and promote the fracture healing and achieve a better healing state.

The present invention further relates to a bone shaft fixation system comprising the foregoing wing-shaped angle steel plate and the first locking screws and the second locking screws, and further comprising a bone shaft lateral locking structure. The above components are used cooperatively. The wing-shaped angle steel plate can realize an effective support and fixation of the fracture end and a close contact with the bone shaft, the bone shaft lateral locking structure can achieve accurate positioning and fixation of the bone shaft fracture site using the locking steel plate, which further enhances the effective support and fixation after the bone shaft fracture and assists in the accurate positioning of the fracture site, thus effectively ensuring the stability of bone shaft after fracture reduction.

Reference numbers in the drawings are listed as follows:
<NUM>- bone shaft; <NUM>- nonunion; <NUM>- wing-shaped angle steel plate; <NUM>- wing fitting portion; <NUM>-body fixation portion; <NUM>- second locking hole; <NUM>- second locking hole; <NUM>- first locking hole; <NUM>- first locking hole; <NUM>- lateral compression hole; <NUM>- lateral compression hole; <NUM>- second locking screw; <NUM>- second locking screw; <NUM>- first locking screw; <NUM>- first locking screw; <NUM>- compression screw; <NUM>- compression screw; <NUM>- second locking screw; <NUM>- second locking screw; <NUM>- bone shaft lateral locking structure; <NUM>- locking steel plate.

The present invention is further described with reference to the accompanying drawings.

The present invention relates to a wing-shaped angle steel plate, comprising a wing fitting portion and a body fixation portion, wherein the wing fitting portion and the body fixation portion are fixedly connected to each other. The wing fitting portion is used for supporting a fracture site (i.e. a fracture end) of the bone shaft and has a structure matched with an inner side surface of the bone shaft, and the body fixation portion is used for fixing the wing fitting portion and has a structure matched with a front side of the bone shaft. The body fixation portion is provided with at least two first locking holes for passing through first locking screws at an intersection site with the wing fitting portion, and the first locking holes have angles such that the first locking screws passing therethrough can realize a close contact with the bone shaft by the body fixation portion and the wing fitting portion and realize supporting of an inner side of the bone shaft, and the body fixation portion is provided with at least two second locking holes for passing through second locking screws in the structure matched with the front side of the bone shaft, the second locking holes have angles such that the second locking screws passing therethrough can realize a close contact between the body fixation portion and the bone shaft and control the rotation and axial stability of the body fixation portion. The specific structural shape of the wing fitting portion and the body fixing portion, the specific position of each locking hole and the number of locking holes can be reasonably set according to the practical applications and are not limited by the present invention and include but is not limited to the above range. For example, the wing fitting portion can be designed into a structure that completely covers the non-healing or nonunion sites of the fracture end, or can be designed into a structure that exposes the non-healing or nonunion sites of the fracture end. For another example, the body fixation portion is provided with three second locking holes in a structure matched with the front side of the bone shaft, and the three second locking holes are arranged in line or in a triangle; or the body fixation portion is provided with four or more second locking holes in the structure matched with the front side of the bone shaft, and these second locking holes are arranged in line or in a polygon. In other words, in the present invention, the length of the wing-shaped angle steel plate can be determined by the number of locking holes provided in a structure of the body fixation portion matched with the front side of the bone shaft, for example, the length of the wing-shaped angle steel plate may be such that four holes, six holes or eight holes are provided.

<FIG> is a front view of a first preferred structure of a wing-shaped angle steel plate <NUM> of the present invention. As shown in <FIG>, a wing-shaped angle steel plate, comprising the wing fitting portion <NUM> and the body fixation portion <NUM>. The wing fitting portion <NUM> and the body fixation portion <NUM> are fixedly connected to each other, the wing fitting portion <NUM> and the body fixing portion <NUM> are preferably made of a stainless steel by an integrated molding process. The wing fitting portion <NUM> is used for supporting and stabilizing a bone shaft fracture site and has a structure matched with an inner side surface of the bone shaft, and the wing fitting portion <NUM> has a structure that completely covers bone shaft fracture sites, i.e. the non-healing or nonunion sites of fracture end, to support and stabilize the fracture end and promote fracture healing. The body fixation portion <NUM> is used for fixing the wing fitting portion <NUM> and has a structure matched with the front side of the bone shaft, the body fixation portion <NUM> is provided with two first locking holes (for example, reference numerals <NUM> and <NUM>, i.e. the first locking hole <NUM> and first locking hole <NUM>) for passing through first locking screws at the intersection site with the wing fitting portion <NUM>. When the first locking screws are used for fixation, the fixation of the wing fitting portion <NUM>, a close contact of the body fixation portion <NUM> and the wing fitting portion <NUM> with the bone shaft, and the supporting of the inner side of the bone shaft are achieved. The body fixation portion <NUM> is provided with two second locking holes (for example, reference numerals <NUM> and <NUM>, i.e. the second locking hole <NUM> and the second locking hole <NUM>) for passing through second locking screws in the structure matched with the front side of the bone shaft. When the second locking screws are used for fixation, the axial support, fixation, anti-rotation of the body fixation portion <NUM> and the tight fit to the front side of the bone shaft are achieved. The body fixing portion <NUM> is further provided with two lateral compression holes (for example, reference numerals <NUM> and <NUM>, i.e. the lateral compression hole <NUM> and the lateral compression hole <NUM>) for passing through compression screws in the structure matched with the front side of the bone shaft. When the compression screw is used for lateral locking at an angle, a pressure can be generated between the bone shaft and the wing-shaped angle steel plate to further strengthen the tight fit between the wing fitting portion <NUM> and the inner side of the bone shaft and the tight fit between the body fixation portion <NUM> and the front side of the bone shaft, that is, to achieve the close contact/tight fit between the wing-shaped angle steel plate <NUM> and the long bone shaft. In addition, as shown in <FIG>, the second locking hole <NUM>, the second locking hole <NUM>, the lateral compression hole <NUM> and the lateral compression hole <NUM> are arranged in an approximately straight line, and can be arbitrarily arranged in any shape as long as an effective fixation and minimum injury to patients can be guaranteed during actual use. In the present invention, the wing-shaped angle steel plate <NUM> adopts an integrally formed structure of a body fixation portion <NUM> and a wing fitting portion <NUM>, and the wing fitting portion <NUM> is of the structure matched with the inner side of the bone shaft, which can achieve good stability and support of the non-healing or nonunion sites of the fracture end, assist in the accurate positioning of the fracture site, and effectively ensure the stability of bone healing. The body fixation portion <NUM> is of the structure matched with the front side of the bone shaft, which can achieve axial positioning and fixation of the fracture area of the long bone shaft, prevent dislocation of the fracture site with good adhesion and fixation, to further guarantee and help accurate positioning, reduction and healing of the fracture sites.

<FIG> is a front view of a second preferred structure of the wing-shaped angle steel plate <NUM> of the present invention. As shown in <FIG>, the wing-shaped angle steel plate <NUM> also comprises a wing fitting portion <NUM> and a body fixation portion <NUM> which are fixedly connected to each other and provided with specific structures. In this embodiment, except for the wing fitting portion <NUM>, other components and functions thereof are the same as those shown in <FIG>. The wing fitting portion20 is still used for supporting the fracture end and has a structure matched with the inner side surface of the bone shaft. The difference from the embodiment shown in <FIG> is that the wing fitting portion <NUM> shown in <FIG> has a structure that exposes the non-healing or nonunion sites of the fracture end and supports the fracture end at the distal end and the proximal end of the non-healing or nonunion sites of the fracture end respectively, to expose the fracture end portion and accelerate and promote the fracture healing and achieve a better fracture healing state while supporting and stabilizing the fracture end.

The working principle and use method of the wing-shaped angle steel plate <NUM> proposed by the present invention are specifically described as follows:
The schematic structural views showing a preferred wing-shaped angle steel plate of the present invention in a used state are shown in <FIG>. In actual uses, first, in the fracture site, for example, in the front side of the bone shaft <NUM>, that is the front side of the nonunion site, the skin, subcutaneous, quadriceps femoris muscle belly and periosteum are cut along long axis of limb , to expose the nonunion site, and then cortical bone cutting is performed at the nonunion site using a sharp bone knife, to fully expose the nonunion site; then a slot is made at the nonunion site using a Kirschner wire and a bone knife, and then a medullary cavity is reperfused along the medullary cavity with the Kirschner wire; the bone cement and structural bone graft are respectively taken by the minimally-invasive bone drill; the bone cement is filled into the nonunion site, and the structural bone graft is embedded in the medullary cavity of the nonunion site; and backfilling is performed with the slotted bone. A submucosal dissection is performed using the extensibility of the skin and muscle, then the wing-shaped angle steel plate <NUM> as shown in <FIG> or <FIG> is implanted under the periosteum. The body fixation portion <NUM> is implanted at the front side of the bone shaft and the wing fitting portion <NUM> is extended into the inside of the bone shaft to protect the fracture end, and the inner side of the wing fitting portion <NUM> is in close contact with the inner side of the bone shaft to play a good supporting role. The embodiment shown in <FIG> and <FIG> employs the wing-shaped angle steel plate <NUM> having a wing fitting portion <NUM> structure that completely covers the fracture end as shown in <FIG>. The embodiment shown in <FIG> and <FIG> employs the wing-shaped angle steel plate <NUM> having a wing fitting portion <NUM> structure that exposes the fracture end and supports the fracture end at the distal end and the proximal end of the fracture end as shown in <FIG>. The inner side of the body fixation portion <NUM> closely contacts and fits with the front side of the bone shaft to play a stable anti-rotation and fixation role. The wing fitting portion <NUM> and the body fixation portion <NUM> cooperate with each other to perfectly achieve effective internal support and fixation for the bone shaft fracture, assist in accurate positioning and healing of the fracture site, and effectively ensure the stability of reduction and healing after bone shaft fracture. As shown in <FIG>, the first locking screw <NUM> and the first locking screw <NUM> respectively pass through the first locking holes <NUM> and first locking hole <NUM> provided in the body fixation portion <NUM> at the intersection site with the wing fitting portion <NUM>, to realize the fixation of the wing fitting portion <NUM>, the close contact of the body fixation portion <NUM> and the wing fitting portion <NUM> with the bone shaft and the support of the inner side of the bone shaft. The second locking screw <NUM> and the second locking screw <NUM> respectively pass through the second locking hole <NUM> and the second locking hole <NUM> provided in the structure of the body fixation portion <NUM> matched with the front side of the bone shaft, to achieve axial support, fixation, anti-rotation of the body fixation portion <NUM> and the tight fit with the front side of the bone shaft. Referring to the embodiments shown in <FIG> (<FIG> is a side view of <FIG>), four second locking holes and four second locking screws are provided, that is, in addition to the second locking screw <NUM> and the second locking screw <NUM>, a second locking screw <NUM> and a second locking screw <NUM> are provided. The four second locking screws can be arranged in a line or in a polygon, to further strengthen axial support, fixation, anti-rotation and fitting effects of the body fixation portion <NUM>. In addition, the compression screw <NUM> and the compression screw <NUM> respectively pass through a lateral compression hole <NUM> and a lateral compression hole <NUM> provided in the structure of the body fixation portion matched with the front side of the bone shaft, and the lateral compression hole has an angle such that the compression screw passing therethrough generates a pressure between the bone shaft and the wing-shaped angle steel plate, as shown in <FIG>, to further enhance the tight fit of the wing fitting portion <NUM> to the inner side of the bone shaft and the close contact/fit between the body fixation portion <NUM> and the front side of the bone shaft, that is, the close contact/tight fit between the wing-shaped angle steel plate <NUM> and the long bone shaft. After fixation and support by the wing-shaped angle steel plate <NUM> of the present invention, a negative pressure drainage tube is intubated, and periosteum, myofascial fascia, deep fascia, subcutaneous tissue and skin are closed by suture. The drainage tube is pulled out <NUM> hours after the operation. In addition, the patient with fracture takes daily exercises of passive extreme knee motion, lower limb isometric contraction, and weight-bearing activities under pain tolerance (toes on ground by <NUM>). The patient receives x-ray examination monthly to determine the weight-bearing process according to fracture healing condition until the patient fully recovers.

The present invention further relates to a bone shaft fixation system, comprising the foregoing wing-shaped angle steel plate, at least four locking screws for fixing the wing-shaped angle steel plate (at least two first locking screws passing through the first locking holes and at least two second locking screws passing through the second locking holes), and a bone shaft lateral locking structure for fixing a fracture end, wherein the structure of the wing-shaped angle steel plate is shown in <FIG>. The bone shaft lateral locking structure comprises a locking steel plate and at least two third locking screws for fixing the locking steel plate, and the locking steel plate has a structure matched with the bone shaft lateral surface. The locking steel plate is provided with at least two third locking holes for passing through the third locking screws in the structure matched with the bone shaft lateral surface, and each of the third locking screws passes through the third locking holes of the locking steel plate.

Preferably, the locking screws (the first locking screws and the second locking screws) for fixing the wing-shaped angle steel plate have a diameter ranging from <NUM> to <NUM>. The locking screws (the first locking screws and the second locking screws) for fixing the wing-shaped angle steel plate and the locking screws (the third locking screws) for fixing the locking steel plate are hollow locking screws or solid locking screws.

According to the schematic structural views showing a preferred bone shaft fixation system in a used state in <FIG> and <FIG>, the bone shaft fixation system comprises a wing-shaped angle steel plate <NUM> and a bone shaft lateral locking structure <NUM> shown in <FIG> or <FIG>. The wing-shaped angle steel plate <NUM> shown in <FIG> has a wing fitting portion <NUM> that completely covers the fracture end as shown in <FIG>, and the wing-shaped angle steel plate <NUM> shown in <FIG> has a wing fitting portion <NUM> structure that exposes a fracture end and supports the fracture end at the distal end and the proximal end of the fracture end as shown in <FIG>. A plurality of locking screws as shown in <FIG> as described above are used for fixing the wing-shaped angle steel plate <NUM>. The bone shaft lateral locking structure <NUM> comprises a locking steel plate <NUM> and a third locking screw for fixing the locking steel plate <NUM>. Preferably, the locking steel plate <NUM> is preferably of a simple rectangular structure, and the locking steel plate <NUM> has a structure matched with the bone shaft lateral surface. The locking steel plate <NUM> is provided with a plurality of openings (third locking holes) in the structure matched with the bone shaft lateral surface. A plurality of third locking screws for fixing the locking steel plate <NUM> may be set in correspondence to the number of openings in the locking steel plate <NUM>, and the locking screws may be arranged in parallel, or some or all of them may be arranged in an angle. The third locking screws may be hollow locking screws or solid locking screws. The number of screws, the arrangement shape of screws and the angle between the screw and the locking steel plate <NUM> can be set according to actual needs, as long as effective fixation can be guaranteed, that is, each locking screws is subjected to different stress by reasonable layout, to achieve and help accurate positioning and stable reduction and fixation of the fracture sites, maximize the optimal fixation stability and ensure minimum injury to patients during actual applications.

The working principle and use method of the bone shaft fixation system proposed by the present invention are specifically described as follows:
As shown in <FIG> and <FIG>, the bone shaft fixation system proposed by the present invention can be fully implanted from a conventional anterolateral incision, that is, the bone shaft lateral locking structure <NUM> and the wing-shaped angle steel plate <NUM> can be implanted together from the same conventional anterolateral incision. Thus, only one incision is required to achieve the implantation of the bone shaft fixation system of the present invention, the intraoperative injury, degree of injury and amount of bleeding are usually smaller, and the postoperative healing and recovery speed are faster. The working principle and use method of the wing-shaped angle steel plate <NUM> shown in <FIG> are the same as those described above. In addition, the bone shaft lateral locking structure <NUM> is a locking steel plate <NUM> structure, and the locking steel plate <NUM> is in close contact with the bone shaft lateral surface. Several third locking screws pass through the openings of the locking steel plate <NUM> to enter from the bone shaft lateral surface and traverse the bone shaft to fix the fracture end. The bone shaft lateral locking structure <NUM> cooperates with the wing-shaped angle steel plate <NUM> to further strengthen the effective support and fixation after bone shaft fracture and assist in the accurate positioning of the fracture sites, thereby effectively ensuring the stability after reduction of the bone shaft fracture.

Claim 1:
A wing-shaped angle steel plate (<NUM>), comprising a wing fitting portion (<NUM>) and a body fixation portion (<NUM>), the wing fitting portion (<NUM>) and the body fixation portion (<NUM>) are fixedly connected to each other, the wing fitting portion is used for supporting a fracture end and has a structure matched with an inner side surface of a bone shaft (<NUM>), the body fixation portion (<NUM>) is used for fixing the wing fitting portion (<NUM>) and has a structure matched with a front side of the bone shaft (<NUM>), and the body fixation portion is provided with at least two first locking holes (<NUM>, <NUM>) for passing through first locking screws (<NUM>, <NUM>) at an intersection site with the wing fitting portion (<NUM>), and the first locking holes (<NUM>, <NUM>) have angles such that the first locking screws (<NUM>, <NUM>) passing therethrough can realize a close contact of the body fixation portion (<NUM>) and the wing fitting portion (<NUM>) with the bone shaft (<NUM>) and realize a support to the inner side of the bone shaft, the body fixation portion is provided with at least two second locking holes (<NUM>, <NUM>) for passing through a second locking screw (<NUM>, <NUM>) on the structure matched with the front side of the bone shaft (<NUM>), and the second locking holes have angles such that the second locking screws passing therethrough can realize a close contact between the body fixation portion (<NUM>) and the bone shaft (<NUM>) and control rotation and axial stability of the body fixation portion (<NUM>).