Fracture fixation device

Abstract

The application discloses a kind of bone fracture fixation devices, the bone fracture fixation device includes internal fixation and external fixation, internal fixation is suitable for being matched in medullary cavity, internal fixation includes body, body has the cavity through body along the extension direction of medullary cavity, body includes first support section and second support section oppositely arranged and can be enclosed cavity, and first support section and / or second support section have elasticity, one end of first support section is connected with one end of second support section, the other end of first support section is spaced apart from the other end of second support section to form elastic groove, external fixation is suitable for being matched in medullary cavity outside and be connected with internal fixation by connecting piece.The internal fixation of the bone fracture fixation device of the application can automatically abut against the inner wall of medullary cavity after being implanted in medullary cavity, to form support to bone wall, solve the difficult reduction during operation, postoperative bone wall collapse and overturning problem caused by bone defect in the bone quality of comminuted fracture or osteoporosis patient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a fracture fixation device. Background Art

[0002] Bone plate technology is mainly used to reduce proximal humeral fractures. The screws on it can grasp the free fracture fragments. Intramedullary nail technology is suitable for humeral shaft fractures and can provide better fixation effect.

[0003] In the related art, proximal humeral fixation devices often adopt two structures. One of them includes an outer plate and bone screws. The outer plate is attached to the fracture site, and then the outer plate is fixed with bone screws to form a clamp on the fracture site. The other includes an outer plate and an internal block. The internal block is placed in the medullary cavity, the outer plate is attached to the fracture site, and bone screws are used to connect the outer plate and the internal block to form a clamp on the fracture site. However, the above two methods cannot overcome the problem of unstable fixation caused by bone defects when facing comminuted fractures, especially in patients with osteoporosis, resulting in difficulty in intraoperative reduction and easy collapse and flipping of the humeral head after surgery. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a fracture fixation device, which includes an internal fixator and an external fixator, the internal fixator being arranged in the medullary cavity, the external fixator being located outside the medullary cavity and connected to the internal fixator to clamp at the fracture position, the internal fixator including a first elastic support segment and a second elastic support segment, the two support segments enclosing a cavity and connected at one end and separated at the other end to form an elastic groove, so that when the internal fixator is placed in the medullary cavity, the two support segments can be clamped to cause the internal fixator to shrink as a whole, and after the placement is completed, the two support segments can rebound and automatically abut against the inner wall of the medullary cavity after the clamping tool is released, thereby not only clamping the free fracture fragments by the internal fixator and assisting the healing of the fracture, but also solving the problem of intraoperative reduction difficulty, postoperative bone wall collapse and flipping caused by bone defects in patients with comminuted fractures or osteoporosis by the internal fixator abutting against the inner wall of the medullary cavity.

[0005] The internal fracture fixation device of an embodiment of the present invention includes: an internal fixator, which is suitable for fitting in the medullary cavity, the internal fixator includes a main body, the main body has a cavity running through the main body along the extension direction of the medullary cavity, the main body includes a first support segment and a second support segment which are relatively arranged and can enclose the cavity, and the first support segment and / or the second support segment are elastic, one end of the first support segment is connected to one end of the second support segment, and the other end of the first support segment is spaced from the other end of the second support segment to form an elastic groove; an external fixator, which is suitable for fitting outside the medullary cavity and is connected to the internal fixator through a connecting member.

[0006] According to the fracture fixation device of the embodiment of the present invention, the internal fixator is suitable for fitting in the medullary cavity, and the external fixator is suitable for fitting outside the medullary cavity and being connected to the internal fixator through a connecting member. The internal fixator includes a main body, and the main body has a first support segment and a second support segment arranged relatively on both sides along the extension direction of the medullary cavity, and the first support segment and / or the second support segment are elastic. One end of the first support segment and the second support segment are connected to each other and surround a cavity, and the other end is spaced apart from each other to form an elastic groove. Therefore, when the internal fixator is placed in the medullary cavity, the two support segments can be clamped to make the internal fixator shrink as a whole. After the placement is completed, the two support segments can rebound and automatically abut against the inner wall of the medullary cavity after the clamping tool is released. Therefore, the internal fixator and the external fixator can be used to clamp the free fracture fragments to assist the healing of the fracture, and the internal fixator can be used to abut against the inner wall of the medullary cavity to solve the problems of intraoperative reduction difficulties, postoperative bone wall collapse and flipping caused by bone defects in patients with comminuted fractures or osteoporosis.

[0007] In some embodiments, the internal fixing member further includes a top support portion, which is connected to the top of the body and is an elastic member. The top support portion is an arc-shaped structure that protrudes in a direction away from the external fixing plate.

[0008] In some embodiments, the top support portion is a support ring, which has a through hole running through the support ring along its thickness direction, and the support ring includes a first ring segment and a second ring segment that are arranged relatively to each other and can form the through hole, one end of the first ring segment is connected to one end of the second ring segment, the other end of the first ring segment is connected to the first support segment, and the other end of the second ring segment is connected to the second support segment.

[0009] In some embodiments, the internal fracture fixation device further comprises an adjusting member, wherein the adjusting member can adjust the size of the elastic groove in the circumferential direction of the cavity; and / or the adjusting member can adjust the curvature of the top support portion.

[0010] In some embodiments, the first supporting segment has a first through-hole, and the second supporting segment has a second through-hole. The first through-hole and the second through-hole are respectively located on both sides of the elastic groove and opposite to the external fixing member. The connecting member includes a first connecting member and a second connecting member. The first connecting member passes through the first through-hole and is connected to the external fixing member, and the second connecting member passes through the second supporting segment and is connected to the external fixing member.

[0011] In some embodiments, the first through-hole and the second through-hole are symmetrically arranged about the elastic groove, and the first through-hole extends toward the second through-hole in a direction close to the external fixer, and the second through-hole extends toward the first through-hole in a direction close to the external fixer. The adjusting member is passed through and connected to the external fixer, and one end of the adjusting member can stop against the internal fixer. The adjusting member is movable relative to the external fixer to push the internal fixer to move in a direction away from the external fixer.

[0012] In some embodiments, both the first through-hole and the second through-hole extend obliquely upward in a direction away from the external fixing member.

[0013] In some embodiments, the internal fixing member has a ball socket that cooperates with the adjusting member; the ball socket is provided on the inner wall of the cavity and is opposite to the elastic groove.

[0014] In some embodiments, the internal fracture fixation device further comprises a support rod, wherein the support rod is passed through the external fixator and a portion of the support rod extends into the internal fixator and is located at the bottom of the internal fixator.

[0015] In some embodiments, the bottom of the main body has a mating groove extending along the arrangement direction of the external fixing member and the internal fixing member, part of the support rod is fitted in the mating groove, the bottom of the elastic groove is connected to the mating groove, and in the circumferential direction of the cavity, the size of the mating groove is larger than the size of the elastic groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a schematic structural diagram of a fracture fixation device according to an embodiment of the present invention.

[0017] Figure 2 1 is a schematic structural diagram of an internal fixator of a fracture fixation device according to an embodiment of the present invention.

[0018] Figure 3 FIG. 4 is a side cross-sectional view of an internal fixator of a fracture fixation device according to an embodiment of the present invention.

[0019] Figure 4 1 is a schematic diagram of assembling an internal fixing member, a first connecting member, a second connecting member, and an adjusting member of a fracture fixation device according to an embodiment of the present invention.

[0020] Figure 5 FIG. 4 is a front view of an internal fixator of a fracture fixation device according to an embodiment of the present invention, showing a ball and socket.

[0021] Figure 6 2 is a schematic structural diagram of a fracture fixation device according to another embodiment of the present invention.

[0022] Figure 7 yes Figure 6 The schematic structural diagram of the internal fixation component of the fracture fixation device is shown.

[0023] Reference numerals:

[0024] Internal fixing member 1, first supporting section 11, first through-hole 111, second supporting section 12, second through-hole 121, elastic groove 13, top supporting portion 14, first ring segment 141, second ring segment 142, ball socket 15, matching groove 16, first annular rib 17, second annular rib 18, first connecting rib 19, second connecting rib 20, supporting rib 21, external fixing member 2, connecting member 3, first connecting member 31, second connecting member 32, adjusting member 4, support rod 5. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] like Figure 1-Figure 5 As shown, the fracture fixation device according to the embodiment of the present invention includes an internal fixator 1 and an external fixator 2 .

[0027] Specifically, the internal fixator 1 is adapted to fit within the medullary cavity and includes a body having a cavity extending through the body along the extension direction of the medullary cavity. The body includes a first support segment 11 and a second support segment 12 arranged opposite to each other and capable of enclosing the cavity. The first support segment 11 and / or the second support segment 12 are elastic. One end of the first support segment 11 is connected to one end of the second support segment 12, and the other end of the first support segment 11 and the other end of the second support segment 12 are separated to form an elastic groove 13. The external fixator 2 is adapted to fit outside the medullary cavity and is connected to the internal fixator 1 via a connector 3. Preferably, both the first support segment 11 and the second support segment 12 are elastic.

[0028] like Figure 1 and Figure 2As shown, the first support segment and the second support segment are both arc-shaped plates extending circumferentially along the medullary cavity. One ends of the first support segment 11 and the second support segment 12 are connected to each other and form a cavity. The other ends of the first support segment 11 and the second support segment 12 are spaced apart to form an elastic groove 13. As a result, the internal fixator 1 forms a hollow shell structure that can be elastically deformed in the medullary cavity, and the cavity can be used to place medicine. Since at least one of the first support segment 11 and the second support segment 12 is elastic, when the internal fixator 1 is placed, the first support segment 11 and the second support segment 12 can be clamped by a clamping tool to shrink the shell. After the placement is completed, the first support segment 11 and the second support segment 12 can rebound after the clamping tool is released to expand the shell. The outer wall of the expanded shell can abut against the inner wall of the medullary cavity, so that the internal fixator 1 can support the bone wall.

[0029] It should be noted that in actual application, the radial dimension of the internal fixator in its natural state should be slightly larger than the size of the medullary cavity so that it can provide support to the bone wall after release. Preferably, in the clamped state, the elastic groove width is reduced by 1-2 mm to allow implantation into the medullary cavity, and the internal fixator 1 is preferably fixed in the medullary cavity when the opening is released.

[0030] It is understandable that when clamping fractures of patients with comminuted fractures or osteoporosis, the integrity of the bones is severely damaged to form bone defects. At this time, it is difficult to reduce the free fracture fragments, and when using traditional fracture fixation methods for treatment, the free fracture fragments are prone to collapse and flipping. However, the internal fixator 1 of the present application can support the bone wall, and the free fracture fragments can be clamped between the internal fixator 1 and the external fixator 2, with a good fixation effect. The supporting function of the internal fixator 1 can well solve the problems of collapse and flipping caused by bone defects.

[0031] According to the fracture fixation device of the embodiment of the present invention, the internal fixator is suitable for fitting in the medullary cavity, and the external fixator is suitable for fitting outside the medullary cavity and being connected to the internal fixator through a connecting member. The internal fixator includes a main body, and the main body has a first support segment and a second support segment arranged relatively on both sides along the extension direction of the medullary cavity, and the first support segment and / or the second support segment are elastic. One end of the first support segment and the second support segment are connected to each other and surround a cavity, and the other end is spaced apart from each other to form an elastic groove. Therefore, when the internal fixator is placed in the medullary cavity, the two support segments can be clamped to make the internal fixator shrink as a whole. After the placement is completed, the two support segments can rebound and automatically abut against the inner wall of the medullary cavity after the clamping tool is released. Therefore, the internal fixator and the external fixator can be used to clamp the free fracture fragments to assist the healing of the fracture, and the internal fixator can be used to abut against the inner wall of the medullary cavity to solve the problems of intraoperative reduction difficulties, postoperative bone wall collapse and flipping caused by bone defects in patients with comminuted fractures or osteoporosis.

[0032] Furthermore, if Figure 1-Figure 5As shown, the internal fixing member 1 further includes a top support portion 14, which is connected to the top of the main body and is an elastic member. The top support portion 14 is an arc-shaped structure that protrudes in a direction away from the external fixing plate.

[0033] It should be noted that some patients, especially the elderly, are prone to osteoporosis in the humeral head, which can easily lead to humeral head collapse after humeral head fracture surgery. The top support portion 14 of the present application can abut against the bone wall at the top of the medullary cavity to prevent postoperative humeral head collapse. It is understandable that the top support portion 14 is configured as an arc-shaped structure to match the contour of the humeral head to improve support stability.

[0034] Preferably, the top support portion 14 is an elastic member, which facilitates the top support portion 14 to adaptively fit the inner wall of the humeral head so that it can better play a supporting role. At the same time, after the operation, according to the progress of the patient's fracture healing, the elastic top support portion 14 can undergo slight deformation, thereby avoiding obstruction to the closure of the bone suture.

[0035] Alternatively, as Figure 1-Figure 5 As shown, the top support portion 14 is a support ring having a through hole running through the support ring along its thickness direction. The support ring includes a first ring segment 141 and a second ring segment 142 that are arranged opposite to each other and can form a through hole. One end of the first ring segment 141 is connected to one end of the second ring segment 142, the other end of the first ring segment 141 is connected to the first support segment 11, and the other end of the second ring segment 142 is connected to the second support segment 12.

[0036] Therefore, the support portion 14 is configured as a ring structure, which can utilize the central ring hole to provide deformation space for the support portion 14 and absorb internal stress, and can also reduce the weight of the internal fixator 1 and reduce the burden on the patient after surgery.

[0037] Furthermore, if Figure 1 、 Figure 3 and Figure 4 As shown, the fracture fixation device further includes an adjustment member 4, which can adjust the circumferential size of the elastic groove 13. It is understood that the required internal support strength of the bone wall varies depending on the bone quality or degree of fracture comminution. Therefore, the provision of the adjustment member 14 can adjust the opening size of the elastic groove 13 according to the support requirements, thereby controlling the degree of expansion of the first support segment 11 and the second support segment 12, thereby flexibly matching the required support strength.

[0038] Furthermore, the adjusting member 4 can adjust the curvature of the top support portion 14 .

[0039] It is understandable that the adjusting member 4 reduces the size requirement of the internal fixing member 1 . For example, if the selected internal fixing member 1 has insufficient supporting force in the loosened state, the adjusting member 4 can also be used to compensate for the insufficient support force.

[0040] Furthermore, if Figure 1 and Figure 2 As shown, the first support segment 11 has a first through-hole 111, and the second support segment 12 has a second through-hole 121. The first through-hole 111 and the second through-hole 121 are respectively located on both sides of the elastic groove 13 and opposite to the external fixing member 2. The connecting member 3 includes a first connecting member 31 and a second connecting member 32. The first connecting member 31 passes through the first through-hole 111 and is connected to the external fixing member 2, and the second connecting member 32 passes through the second support segment 12 and is connected to the external fixing member 2.

[0041] In other words, the first connecting member 31 and the second connecting member 32 are inserted into both sides of the elastic groove 13 and connect the external fixer 2 and the internal fixer 1. Thus, the first connecting member 31 and the second connecting member 32 set up the internal fixer 1 and the external fixer 2 at the fracture site, which not only ensures the firmness of the fracture fixation device installation, but also improves the balance of the fracture fixation device installation.

[0042] Furthermore, if Figure 1-Figure 5 As shown, the first through-hole 111 and the second through-hole 121 are symmetrically arranged about the elastic groove 13, and the first through-hole 111 extends toward the second through-hole 121 in a direction close to the external fixer 2, and the second through-hole 121 extends toward the first through-hole 111 in a direction close to the external fixer 2. The adjusting member 4 is disposed on and connected to the external fixer 2, and one end of the adjusting member 4 can abut against the internal fixer 1. The adjusting member 4 is movable relative to the external fixer 2 to push the internal fixer 1 to move in a direction away from the external fixer 2.

[0043] In other words, the first through-hole 111 and the second through-hole 121 are symmetrically arranged on the first supporting segment 11 and the second supporting segment 12 on both sides of the elastic groove 13. At the same time, the extension directions of the openings of the first through-hole 111 and the second through-hole 121 form an angle, and the spacing distance between the first through-hole 111 and the second through-hole 121 gradually increases in the direction away from the external fixer 2. As a result, the spacing distance between the first connecting member 31 and the second connecting member 32 provided therebetween also gradually increases in the direction away from the external fixer 2. When the adjusting member 4 pushes the internal fixer 1 to move on the connecting member 3 in the direction away from the external fixer 2, the first supporting segment 11 and the second supporting segment 12 will expand outward, thereby increasing the supporting force on the bone wall.

[0044] Specifically, during actual assembly, the internal fixator 1 and the external fixator 2 can be first placed at the fracture site and matched through the first connecting member 31 and the second connecting member 32. Then, according to the support requirements, the adjustment member 4 is controlled to push the internal fixator 1 to move a preset stroke so that the first support segment 11 and the second support segment 12 can expand relative to each other, thereby achieving support for the bone wall.

[0045] Preferably, the adjusting member 4 is threadedly matched with the external fixing member 2, which facilitates the control of the adjustment accuracy and has an anti-retraction function.

[0046] It should be noted that the shapes of the medullary cavities of different patients are different and the maximum supporting forces required by different bones are also different. The angle between the extension directions of the first through hole 111 and the second through hole 121 can be selected according to the specific situation, and its range is between 3° and 15°.

[0047] Furthermore, if Figure 1-Figure 5 As shown, the first through hole 111 and the second through hole 121 both extend obliquely upward in a direction away from the external fixing member 2 .

[0048] In other words, the first through-hole 111 and the second through-hole 121 extend obliquely toward the top of the medullary cavity. Thus, when the adjusting member 4 pushes the internal fixator 1 to move in a direction away from the external fixator 2, the internal fixator 1 will simultaneously move toward the top of the medullary cavity under the limiting action of the first connecting member 31 and the second connecting member 32, so that the top support portion 14 can be inclined toward the top wall of the medullary cavity to prevent the head from flipping and collapsing.

[0049] Alternatively, as Figure 2-Figure 5 As shown, the internal fixing member 1 has a ball socket 15 that cooperates with the adjusting member 4. The ball socket 15 is provided on the inner wall of the cavity and is opposite to the elastic groove 13. Thus, the adjusting member 4 can pass through the elastic groove 13 and cooperate with the ball socket 15, which is convenient for assembly. At the same time, the mating ends of the adjusting member 4 and the ball socket 15 can be set to a spherical surface so that the two can cooperate without scratching the internal fixing member 1.

[0050] Furthermore, if Figure 1 and Figure 2 As shown, the fracture fixation device further includes a support rod 5 , which is passed through the external fixator 2 and a portion of the support rod 5 extends into the internal fixator 1 and is located at the bottom of the internal fixator 1 .

[0051] It is understandable that the support rod 5 can support the internal fixing member 1, distribute the load-bearing of each connecting member, and increase the stability of the installation of the internal fixing member 1.

[0052] Furthermore, if Figure 1 and Figure 2 As shown, the bottom of the body has a matching groove 16 extending along the arrangement direction of the external fixing member 2 and the internal fixing member 1. Part of the support rod 5 fits in the matching groove 16. The bottom of the elastic groove 13 is connected to the matching groove 16, and in the circumferential direction of the cavity, the size of the matching groove 16 is larger than the size of the elastic groove 13, that is, the groove at the bottom of the body is matched with the support rod 5, which is convenient for disassembly and assembly.

[0053] Optionally, the internal fixator 1 of the fracture fixation device of the present application is not limited to Figure 1-Figure 5 For example, Figure 6 and Figure 7As shown, the internal fixator 1 is composed of a plurality of connecting ribs, wherein the main body includes a first annular rib 17 and a second annular rib 18 spaced apart from each other in an upper and lower direction. Both annular ribs have a disconnection opening, and the two annular ribs are connected by a first connecting rib 19 and a second connecting rib 20 arranged opposite to each other on both sides of the disconnection opening. When the internal fixator 1 is placed, a clamping tool can be used to clamp the two connecting ribs to shrink the annular ribs. After the placement is completed, the clamping tool can be released, and the annular ribs can rebound to expand the internal fixator 1.

[0054] Furthermore, the first annular rib 17 is provided with an upwardly extending, arcuate support rib 21. This support rib 21 serves as the top support portion 14 to support the inner wall of the humeral head. It will be appreciated that the arcuate curve of the support rib 21 perfectly matches the curved surface of the inner wall of the humeral head, providing a good fit and stable support. Preferably, a plurality of support ribs 21 are arranged at intervals along the circumference of the first annular rib 17.

[0055] Furthermore, the first connecting member 31 and the second connecting member 32 are arranged between the two connecting ribs, and the first connecting member 31 is attached to the inner side of the first connecting rib 19, and the second connecting member 32 is attached to the inner side of the second connecting rib 20. Since the spacing between the first connecting member 31 and the second connecting member 32 gradually increases in the direction away from the external fixer 2, when the adjusting member 4 pushes the internal fixer 1 to move in the direction away from the external fixer 2, the two connecting ribs will move away from each other under the limiting action of the first connecting member 31 and the second connecting member 32. Accordingly, the annular ribs will expand, and the supporting force of the internal fixer 1 on the bone wall will increase.

[0056] Furthermore, the first connecting member 31 and the second connecting member 32 are supported on the lower side of the first annular rib 17, and the support rod 5 is supported on the upper side of the second annular rib 18. The limiting function of the connecting member and the first annular rib 17 can prevent the internal fixing member 1 from moving downward, and the limiting function of the support rod and the second annular rib 18 can prevent the internal fixing member 1 from moving upward. Thus, the two sets of limiting functions can work together to achieve the limiting function of the internal fixing member 1, thereby improving the assembly stability.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0062] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A fracture fixation device, characterized in that: include: An internal fixator adapted to fit within the medullary cavity, the internal fixator comprising a body having a cavity extending through the body along an extension direction of the medullary cavity, the body comprising a first support segment and a second support segment arranged opposite to each other and capable of enclosing the cavity, the first support segment and / or the second support segment being elastic, one end of the first support segment being connected to one end of the second support segment, and the other end of the first support segment being spaced apart from the other end of the second support segment to form an elastic groove; an external fixer adapted to fit outside the medullary cavity and connected to the internal fixer via a connector, the first supporting segment having a first through-hole, the second supporting segment having a second through-hole, the first through-hole and the second through-hole being respectively located on either side of the elastic groove and opposite to the external fixer, the connector comprising a first connector and a second connector, the first connector passing through the first through-hole and connected to the external fixer, the second connector passing through the second supporting segment and connected to the external fixer; An adjusting member, wherein the adjusting member can adjust the size of the elastic groove in the circumferential direction of the cavity, the first perforation and the second perforation are symmetrically arranged about the elastic groove, and the first perforation extends toward the second perforation in a direction close to the external fixer, and the second perforation extends toward the first perforation in a direction close to the external fixer, the adjusting member is passed through the external fixer and connected to the external fixer, and one end of the adjusting member can stop against the internal fixer, and the adjusting member is movable relative to the external fixer to push the internal fixer to move in a direction away from the external fixer.

2. The fracture fixation device according to claim 1, characterized in that: The inner fixing member further includes a top supporting portion, which is connected to the top of the body and is an elastic member. The top supporting portion is an arc-shaped structure that protrudes in a direction away from the outer fixing member.

3. The fracture fixation device according to claim 2, characterized in that: The top support portion is a support ring, which has a through hole running through the support ring along its thickness direction. The support ring includes a first ring segment and a second ring segment that are arranged opposite to each other and can form the through hole. One end of the first ring segment is connected to one end of the second ring segment, the other end of the first ring segment is connected to the first support segment, and the other end of the second ring segment is connected to the second support segment.

4. The fracture fixation device according to claim 2, characterized in that: The adjusting member can adjust the curvature of the top supporting portion.

5. The fracture fixation device according to claim 1, characterized in that: The first through hole and the second through hole both extend obliquely upward in a direction away from the external fixing member.

6. The fracture fixation device according to claim 1, characterized in that: The internal fixing member has a ball socket that cooperates with the adjusting member; The ball socket is arranged on the inner wall of the cavity and is opposite to the elastic groove.

7. The fracture fixation device according to any one of claims 1 to 6, characterized in that: It also includes a support rod, which is passed through the external fixing member and a portion of the support rod extends into the internal fixing member and is located at the bottom of the internal fixing member.

8. The fracture fixation device according to claim 7, characterized in that: The bottom of the body has a matching groove extending along the arrangement direction of the external fixing member and the internal fixing member, and a portion of the support rod is fitted in the matching groove. The bottom of the elastic groove is connected to the matching groove, and in the circumferential direction of the cavity, the size of the matching groove is larger than that of the elastic groove.

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