External fixation support for fracture

Abstract

The invention discloses a fracture external fixation support, and relates to the technical field of medical instruments, the fracture external fixation support comprises a support main body, a plurality of guide cylinders, a plurality of bone needles, a plurality of bone needle clamps and a plurality of force arm adjusting caps, the plurality of guide cylinders are arranged on the support main body, the guide cylinders are provided with guide channels, and the support main body is provided with locking holes corresponding to the guide channels; the guide cylinders, the bone needles, the bone needle clamps and the force arm adjusting caps are in one-to-one correspondence, the bone needles sequentially penetrate through the locking holes and the guide channels, the heads of the bone needles extend out of the guide cylinders, the tails of the bone needles are locked with the support body through the bone needle clamps, and the guide cylinders are sleeved with the force arm adjusting caps. The fixing strength is adjusted by adjusting the position of the force arm adjusting cap on the guide cylinder. The fixing strength can be adjusted, different requirements for the fixing strength in the fracture healing process are met, and the use of the device can better meet the mechanical requirement during fracture healing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a bone fracture external fixation support. BACKGROUND

[0002] At present, surgical treatment is the most important treatment for bone fracture, and strong fixation strength is needed in the early stage of fracture healing, and the fixation strength needs to be gradually weakened to further promote the healing of the fracture.

[0003] In surgical treatment, internal fixation structure is often used to promote the healing of the fracture. However, the internal fixation structure cannot adjust the fixation strength because it is arranged on the inner side of the skin. SUMMARY

[0004] The purpose of the present application is to provide a bone fracture external fixation support to solve the above-mentioned problems existing in the prior art, so that the fixation strength can be adjusted.

[0005] To achieve the above-mentioned purpose, the present application provides the following scheme: The present application provides a bone fracture external fixation support, which comprises a support body, a plurality of guide cylinders, a plurality of bone needles, a plurality of bone needle clamps and a plurality of force arm adjusting caps. The guide cylinders are arranged on the support body, the guide cylinders are provided with guide channels, the support body is provided with locking holes corresponding to the guide channels, the guide channels are communicated with the locking holes, the guide cylinders, the bone needles, the bone needle clamps and the force arm adjusting caps are one-to-one corresponding, the bone needles pass through the locking holes and the guide channels in sequence, the head of the bone needle extends out of the guide cylinder, the tail of the bone needle is locked with the support body through the bone needle clamp, and the force arm adjusting cap is sleeved on the guide cylinder. The fixation strength is adjusted by adjusting the position of the force arm adjusting cap on the guide cylinder.

[0006] In some specific schemes, the inner wall of the locking hole is provided with a locking inner thread, the outer wall of the bone needle clamp is provided with a locking outer thread, the locking inner thread is matched with the locking outer thread, and the locking of the bone needle by the bone needle clamp is realized through the locking inner thread and the locking outer thread.

[0007] In some specific schemes, the bone needle clamp comprises a hand-held part and at least two clamping parts, one end of the hand-held part is connected with one end of each clamping part, there is a gap between adjacent clamping parts, and the outer wall of the clamping part is provided with a locking outer thread.

[0008] In some specific schemes, the wall thickness of the clamping part gradually decreases from one end of the clamping part close to the hand-held part to the other end of the clamping part away from the hand-held part.

[0009] In some specific designs, there is a gap between the locking hole and the bone needle.

[0010] In some specific designs, a limiting step is provided inside the locking hole, and the limiting step is used to restrict the bone needle clamp.

[0011] In some specific designs, the inner wall of the lever arm adjusting cap is provided with a lever arm adjusting internal thread, and the outer wall of the guide cylinder is provided with a lever arm adjusting external thread. The lever arm adjusting internal thread and the lever arm adjusting external thread are matched, and the adjustment of the fixed strength is achieved through the lever arm adjusting internal thread and the lever arm adjusting external thread.

[0012] In some specific embodiments, the guide cylinder includes at least two guide portions, one end of each guide portion is connected to the main body of the bracket, there is a gap between adjacent guide portions, and the outer wall of the guide portion is provided with locking external threads.

[0013] In some specific designs, the wall thickness of the guide portion gradually increases from the end of the guide portion closer to the support body to the end of the guide portion farther from the support body.

[0014] The present invention achieves the following technical effects compared to the prior art: When the fracture external fixation bracket of the present invention is used, the bracket body, guide tube, bone pin clamp and lever arm adjustment cap are all located outside the skin. The bone pin is double locked by the bone pin clamp and lever arm adjustment cap. The fixation strength can be adjusted by adjusting the position of the lever arm adjustment cap to meet the different fixation strength requirements during the fracture healing process, so that the use of the device can better meet the mechanical requirements of fracture healing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of an external fixation frame for fractures in some embodiments of the present invention; Figure 2 This is a cross-sectional view of an external fixation frame for fractures in some embodiments of the present invention; Figure 3 This is a front view of the support body and guide cylinder in some embodiments of the present invention; Figure 4 This is a cross-sectional view of the support body and guide cylinder in some embodiments of the present invention; Figure 5This is a front view of the bone needle clip in some embodiments of the present invention; Figure 6 This is a front view of a bone needle in some embodiments of the present invention; In the diagram: 1-Support body, 2-Guide cylinder, 3-Bone needle, 4-Lever arm adjustment cap, 5-Locking hole, 6-Guide channel, 7-Limiting step, 8-Handheld part, 9-Clamping part, 10-Bone needle clamp. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide an external fixation bracket for fractures to solve the problems existing in the prior art and to enable the fixation strength to be adjusted.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1 to 6 As shown, this embodiment provides an external fixation frame for fractures, including a frame body 1, several guide cylinders 2, several bone pins 3, several bone pin clips 10, and several lever arm adjustment caps 4. The frame body 1, guide cylinders 2, bone pin clips 10, and lever arm adjustment caps 4 are all located outside the skin. Several guide cylinders 2 are set on the frame body 1, and the guide cylinders 2 and the frame body 1 are fixedly set. The guide cylinders 2 are provided with guide channels 6. The frame body 1 is provided with locking holes 5 corresponding to the guide channels 6. The guide channels 6 and the locking holes 5 are connected. The guide cylinders 2, bone pins 3, bone pin clips 10, and lever arm adjustment caps 4 are one-to-one. The bone pins 3 pass through the locking holes 5 and the guide channels 6 in sequence. The tips of the bone pins 3 extend out of the guide cylinders 2. The tails of the bone pins 3 are locked to the frame body 1 through the bone pin clips 10. The lever arm adjustment caps 4 are sleeved on the guide cylinders 2. The fixation strength is adjusted by adjusting the position of the lever arm adjustment caps 4 on the guide cylinders 2. In this embodiment, the bone pin 3 is dually locked by the bone pin clamp 10 and the lever arm adjustment cap 4. The fixation strength can be adjusted by adjusting the position of the lever arm adjustment cap 4 to meet the different needs for fixation strength during the fracture healing process, so that the use of the device can better meet the mechanical requirements of fracture healing.

[0021] In some specific embodiments, a gap exists between the locking hole 5 and the bone pin 3. A gap also exists between the guide channel 6 and the bone pin 3 when the lever arm adjusting cap 4 does not lock the guide cylinder 2 and the bone pin 3.

[0022] In some specific embodiments, a limiting step 7 is provided in the locking hole 5, which is used to limit the bone needle clamp 10.

[0023] In some specific embodiments, the inner wall of the locking hole 5 is provided with a locking internal thread, and the outer wall of the bone pin clamp 10 is provided with a locking external thread. The locking internal thread and the locking external thread are matched, and the locking of the bone pin clamp 10 to the bone pin 3 is achieved by the locking internal thread and the locking external thread.

[0024] Specifically, in some embodiments, the bone needle clip 10 is integrally formed, and the bone needle clip 10 includes a handle portion 8 and at least two clamping portions 9, preferably four clamping portions 9. The handle portion 8 has a hexagonal cross-section, one end of the handle portion 8 is connected to one end of each clamping portion 9, the upper ends of adjacent clamping portions 9 are connected, and there are gaps between adjacent clamping portions 9 except for the upper ends. The outer wall of the clamping portion 9 is provided with locking external threads. The wall thickness of the clamping portion 9 gradually decreases from the end of the clamping portion 9 near the handle portion 8 to the end of the clamping portion 9 away from the handle portion 8. The inner wall of the clamping portion 9 is vertically arranged, and the outer wall of the clamping portion 9 slopes from the outside to the inside from the end of the clamping portion 9 near the handle portion 8 to the end of the clamping portion 9 away from the handle portion 8. When the bone needle 3 is located in the locking hole 5 and the guide channel 6, and the bone needle clamp 10 is used to lock the bone needle 3, rotate the bone needle clamp 10 so that the clamping part 9 of the bone needle clamp 10 approaches the limiting step 7. As the clamping part 9 of the bone needle 3 gradually approaches the limiting step 7, the gaps between each clamping part 9 gradually close, and the bone needle clamp 10, the support body 1 and the bone needle 3 are gradually locked together.

[0025] In some specific embodiments, the cross-section of the lever arm adjusting cap 4 is hexagonal, the inner wall of the lever arm adjusting cap 4 is provided with a lever arm adjusting internal thread, and the outer wall of the guide cylinder 2 is provided with a lever arm adjusting external thread. The lever arm adjusting internal thread and the lever arm adjusting external thread are matched, and the adjustment of the fixed strength is achieved by the lever arm adjusting internal thread and the lever arm adjusting external thread.

[0026] In some specific embodiments, the guide cylinder 2 includes at least two guide portions, preferably four, one end of each guide portion is connected to the bracket body 1, the upper ends of adjacent guide portions are connected and there is a gap between adjacent guide portions except for the upper end, and the outer wall of the guide portion is provided with locking external threads.

[0027] In some specific embodiments, the wall thickness of the guide gradually increases from the end of the guide near the support body 1 to the end of the guide away from the support body 1. The inner wall of the guide is vertically arranged, and the outer wall of the guide slopes from the inside to the outside from the end of the guide near the support body 1 to the end of the guide away from the support body 1. The taper of the inner wall of the lever arm adjusting cap 4 matches the taper of the outer wall of the guide.

[0028] In some specific embodiments, the tip of the bone needle 3 is a regular triangular pyramid, and the part of the bone needle 3 that extends into the bone (excluding the tip) is provided with external threads.

[0029] In this embodiment, the distance between the fixation point of the fracture external fixation bracket and the position where the bone pin 3 acts on the bone is the lever arm. When only the bone pin clamp 10 fixes the bone pin 3, the lever arm is the distance between the bone pin clamp 10 and the position where the bone pin 3 acts on the bone. When the lever arm adjusting cap 4 is used to further lock the bone pin 3 and the guide cylinder 2, the lever arm is the distance between the guide cylinder 2 (specifically, the locking position of the guide cylinder 2 and the bone pin 3) and the position where the bone pin 3 acts on the bone. As the lever arm adjusting cap 4 moves away from the bracket body 1, the lever arm decreases, the stiffness increases, and the fixation strength increases; conversely, as the lever arm adjusting cap 4 moves closer to the bracket body 1, the lever arm increases, the stiffness decreases, and the fixation strength decreases.

[0030] When using the external fixation brace of this embodiment, the bone pins 3 are passed sequentially through the locking holes 5 and the wire channel, with the lower end of the bone pins 3 penetrating deep into the bone. The clamping part 9 is rotated by the hand-held part 8. As the clamping part 9 approaches the limiting step 7, the bone pin clamp 10 gradually locks the tail of the bone pin 3, achieving initial locking of the bone pins 3. The position of the lever arm adjusting cap 4 on the guide tube 2 is adjusted according to the degree of fracture, thereby adjusting the fixation strength. After the patient wears the external fixation brace of this embodiment for a period of time, if the fracture condition is judged to be better than at the time of surgery based on the examination results (whether callus has formed), the position of the lever arm adjusting cap 4 can be adjusted so that the lever arm adjusting cap 4 moves towards the direction closer to the main body 1 of the brace, reducing the fixation strength. If after the patient wears the external fixation brace of this embodiment for a period of time, if the fracture condition is judged not to be better than at the time of surgery based on the examination results, the position of the lever arm adjusting cap 4 can be maintained to continue to maintain this fixation strength, or the lever arm adjusting cap 4 can be moved away from the main body 1 of the brace, increasing the fixation strength. Meanwhile, the use of bone pin clip 10 and lever arm adjustment cap 4 can achieve double locking, disperse stress, and avoid stress concentration that could cause internal fixation fracture.

[0031] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0034] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0035] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0036] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0037] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0038] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0039] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An external fixation device for fractures, characterized in that: The device includes a support body, several guide cylinders, several bone pins, several bone pin clamps, and several lever arm adjustment caps. The guide cylinders are mounted on the support body and each guide cylinder has a guide channel. The support body has locking holes corresponding to the guide channels, and the guide channels communicate with the locking holes. Each guide cylinder, bone pin, bone pin clamp, and lever arm adjustment cap corresponds to another bone pin. The bone pins pass sequentially through the locking holes and the guide channels, with the head of the bone pin extending out of the guide cylinder. The tail of the bone pin is locked to the support body by the bone pin clamp. The lever arm adjustment caps are fitted onto the guide cylinders, and the fixing strength is adjusted by adjusting the position of the lever arm adjustment caps on the guide cylinders.

2. The fracture external fixation frame according to claim 1, characterized in that: The inner wall of the locking hole is provided with a locking internal thread, and the outer wall of the bone pin clamp is provided with a locking external thread. The locking internal thread matches the locking external thread, and the locking of the bone pin clamp on the bone pin is achieved by the locking internal thread and the locking external thread.

3. The fracture external fixation frame according to claim 2, characterized in that: The bone needle clip includes a hand-held part and at least two clamping parts. One end of the hand-held part is connected to one end of each clamping part. There is a gap between adjacent clamping parts. The outer wall of the clamping part is provided with a locking external thread.

4. The fracture external fixation bracket according to claim 3, characterized in that: The wall thickness of the clamping part gradually decreases from the end of the clamping part closer to the hand-held part to the end of the clamping part farther away from the hand-held part.

5. The fracture external fixation bracket according to claim 1, characterized in that: There is a gap between the locking hole and the bone needle.

6. The fracture external fixation bracket according to claim 1, characterized in that: A limiting step is provided in the locking hole, and the limiting step is used to restrict the bone needle clamp.

7. The fracture external fixation bracket according to claim 1, characterized in that: The inner wall of the lever arm adjusting cap is provided with a lever arm adjusting internal thread, and the outer wall of the guide cylinder is provided with a lever arm adjusting external thread. The lever arm adjusting internal thread and the lever arm adjusting external thread are matched, and the fixed strength is adjusted by the lever arm adjusting internal thread and the lever arm adjusting external thread.

8. The fracture external fixation bracket according to claim 7, characterized in that: The guide cylinder includes at least two guide portions, one end of each guide portion is connected to the main body of the bracket, there is a gap between adjacent guide portions, and the outer wall of the guide portion is provided with locking external threads.

9. The fracture external fixation bracket according to claim 8, characterized in that: The wall thickness of the guide portion gradually increases from the end of the guide portion closer to the support body to the end of the guide portion farther away from the support body.

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