Orthopedic regulation rod and external fixation frame system

Abstract

The present application relates to the field of orthopedic medical devices, in particular to an orthopedic adjusting rod and external fixation frame system. The orthopedic adjusting rod comprises a rod body extending in the up-down direction and a ball head arranged at the upper end of the rod body, a shell is sleeved on the ball head, a locking rod is screw-mounted on the shell, a pressing piece is arranged between the locking rod and the ball head, the pressing piece has a fitting part and a deformation part, the fitting part is fitted with the ball head, the deformation part has a space with the ball head, and the locking rod is pressed at the position of the deformation part. The rod body can be adjusted in angle through the ball head in the shell, after adjustment, the locking rod is tightened, the locking rod moves downward to apply a pressing force to the pressing piece, the deformation part of the pressing piece is deformed under the action of the pressing force to increase the fitting area with the ball head, so that the friction between the pressing piece and the ball head is increased to provide sufficient locking force to prevent loosening of the ball head.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of orthopedic medical devices, in particular to an orthopedic adjusting rod and external fixation frame system. BACKGROUND

[0002] During fracture treatment, an external fixation frame is needed to reset the fracture site, and the external fixation frame includes a fixing ring and an adjusting rod. For example, the adjusting rod disclosed in the patent with the authorization announcement number CN 208892743 U includes a ball head, which includes two hemispherical shells. The hemispherical shells are provided with grooves matched with the ball head, and the two hemispherical shells are locked by a locking sleeve.

[0003] Since the hemispherical shells, the locking sleeve and the ball head are all rigid structures, the position of the ball head will still be loose after locking in actual use. SUMMARY

[0004] The present application provides an orthopedic adjusting rod to solve the problem of easy loosening of the ball head of the existing adjusting rod. Meanwhile, the present application also provides an external fixation frame system using the above orthopedic adjusting rod.

[0005] The orthopedic adjusting rod of the present application adopts the following technical scheme:

[0006] The orthopedic adjusting rod includes a rod body extending in the up-down direction and a ball head provided at the upper end of the rod body. A shell is sleeved on the ball head. A locking rod is spirally installed on the shell. A pressing piece is provided between the locking rod and the ball head. The pressing piece has a fitting part and a deformation part. The fitting part is fitted with the ball head. The deformation part has a gap with the ball head. The locking rod is pressed at the position of the deformation part.

[0007] The fitting part has a fitting surface top-pressed with the inner wall of the shell.

[0008] The pressing piece is a pressing sleeve. The inner wall of the pressing sleeve has a gap between the middle position and the ball head, forming the deformation part. The edge position of the inner wall of the pressing sleeve is fitted with the ball head, forming the fitting part. The outer wall of the edge position of the pressing sleeve is top-pressed with the inner wall of the shell, forming the fitting surface.

[0009] An elastic piece is provided between the ball head and the shell. The elastic piece is located at a position opposite to the pressing piece.

[0010] The elastic piece is an elastic ring sleeved on the ball head.

[0011] The external fixation frame system of the present application adopts the following technical scheme:

[0012] The external fixation frame system comprises a fixing ring and an orthopedic adjusting rod connected to the fixing ring, the orthopedic adjusting rod comprises a rod body extending in the up-down direction and a ball head arranged at the upper end of the rod body, a shell is sleeved on the ball head, a locking rod is screw-mounted on the shell, a pressing piece is arranged between the locking rod and the ball head, the pressing piece has a fitting part and a deformation part, the fitting part is fitted with the ball head, and the deformation part has a space with the ball head, and the locking rod is pressed at the position of the deformation part.

[0013] The fitting part has a fitting surface which is top-pressed with the inner wall of the shell.

[0014] The pressing piece is a pressing sleeve, the inner wall of the pressing sleeve has a space with the ball head at the middle position, forming the deformation part, the edge position of the inner wall of the pressing sleeve is fitted with the ball head, forming the fitting part, and the outer wall of the edge position of the pressing sleeve is top-pressed with the inner wall of the shell, forming the fitting surface.

[0015] The ball head and the shell are provided with an elastic piece, and the elastic piece is arranged at a position opposite to the pressing piece.

[0016] The elastic piece is an elastic ring sleeved on the ball head.

[0017] The orthopedic adjusting rod of the present application can realize angle adjustment of the rod body through the ball head in the shell during use, and after adjustment, the locking rod is tightened, the locking rod is moved downward to apply a pressing force to the pressing piece, the deformation part of the pressing piece is deformed under the action of the pressing force, the fitting area of the deformation part with the ball head is increased, the friction between the pressing piece and the ball head is increased, and sufficient locking force is provided to prevent loosening of the ball head. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a structure diagram of the orthopedic adjusting rod in the embodiment 1 of the external fixation frame system of the present application.

[0020] Figure 2 It is a structure diagram of the pressing piece in the embodiment 1 of the external fixation frame system of the present application. Figure 1 It is a structure diagram of the pressing piece in the embodiment 1 of the external fixation frame system of the present application.

[0021] Figure 3 It is a structure diagram of the pressing piece in the embodiment 2 of the external fixation frame system of the present application.

[0022] Figure 1 and Figure 2 Corresponding to Embodiment 1: 1. Rod body; 2. Outer sleeve; 3. Ball head; 4. Top pressure component; 5. Top cover; 6. Locking rod; 7. Nut; 21. Stop; 41. Deformable part; 42. Mating surface; 43. Fitting part.

[0023] Figure 3 Corresponding to Example 2: 8, top pressure sleeve; 81, through hole. Detailed Implementation

[0024] 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.

[0025] An embodiment of the external fixation system of the present invention includes a fixation ring and an orthopedic adjustment rod connected to the fixation ring, the orthopedic adjustment rod being as follows: Figures 1 to 2 As shown, the device includes a rod 1 extending vertically and a ball head 3 located at the upper end of the rod 1. A housing is fitted onto the ball head 3. A locking rod is screwed onto the housing. A pressing member 4 is provided between the locking rod and the ball head 3. The pressing member 4 has a fitting part 43 and a deformable part 41. The fitting part 43 fits into the ball head 3, and the deformable part 41 is spaced apart from the ball head 3. Figure 1 and Figure 2 At point A, the locking rod presses against the deformable part 41. The fitting part 43 has a mating surface 42 that presses against the inner wall of the housing.

[0026] In this embodiment, the housing includes an outer sleeve 2 and an upper cover 5. The outer sleeve 2 is a hollow structure, and the upper cover 5 is connected to the outer sleeve 2 via a threaded structure. A through hole is provided in the middle of the outer sleeve 2, and a thread is provided at the lower end of the through hole. A locking rod is inserted into the through hole and engages with the thread at the lower end. The upper end of the upper cover 5 is provided with an upwardly extending cantilever column, which is used to insert into the mounting hole of the fixing ring and is locked and fixed by a nut 7.

[0027] Specifically, such as Figure 2 As shown, the pressing member 4 is a pressing sleeve. A gap exists between the middle of the inner wall of the pressing sleeve and the ball head 3, forming a deformable portion 41. The edge of the inner wall of the pressing sleeve fits against the ball head 3, forming a fitting portion 43. The inner wall of the fitting portion 43 has a spherical structure adapted to the ball head 3. The outer wall at the edge of the pressing sleeve presses against the inner wall of the housing, forming a mating surface 42. To increase friction, stripes, protrusions, or pits can be provided on the inner wall of the pressing sleeve and the ball head 3.

[0028] In this embodiment, an elastic element is provided between the ball head 3 and the housing, and the elastic element is positioned opposite to the pressing element 4. The elastic element is used to provide elastic preload during locking.

[0029] The elastic element is a rubber ring fitted onto the ball head 3. Specific installation details are as follows: Figure 1 As shown, a baffle 21 is provided at the lower part of the outer sleeve 2. The baffle 21 has a ring structure, and its middle part is used for the lower end of the ball head 3 to extend downward. The elastic ring is fitted onto the ball head 3 at the position where the ring and the inner wall of the outer sleeve 2 meet.

[0030] During locking, the locking lever is tightened using a tool to move it downwards. The lower end of the locking lever applies downward pressure to the top pressure member 4. Due to the gap between the deformable part 41 and the ball head 3, the deformable part 41 undergoes slight deformation under the pressure. This deformation has two effects: first, it creates pressure between the outer wall of the top pressure member 4 and the inner wall of the outer sleeve 2, increasing the friction between them and fixing the outer sleeve 2 relatively; second, it causes the top pressure member 4 to tend to move downwards. Under this tendency, the edge of the top pressure member 4 moves downwards into the space between the outer sleeve 2 and the ball head 3, forming a wedge-like effect that clamps the ball head 3. Both of these effects increase the locking force of the ball head 3.

[0031] During locking, the elastic ring is compressed. Since the elastic ring is located at the connection point between the stop 21 and the inner wall of the outer sleeve 2, i.e., at the corner, the elastic ring will deform in two directions at the corner. Figure 1 The deformations in the horizontal and vertical directions serve two purposes: during locking, they provide preload to ensure locking reliability; during unlocking, the elastic ring rebounds to its original shape. During the rebound process, there are deformations in two directions, namely the horizontal and vertical directions. When the ball head 3 swings at a certain angle (in actual use, the ball head 3 is often not in a standard vertical position), the horizontal deformation causes the ball head 3 to move towards the vertical position. This causes relative sliding between the ball head 3 and the pressing part 4, making it easier for the ball head 3 and the pressing part 4 to unlock.

[0032] Embodiment 2 of the present invention, as follows Figure 3 As shown: In this embodiment, the top pressure sleeve 8 is cylindrical in shape, with a conical hole in the middle and a through hole 81 at the upper end of the conical hole. When the ball head contacts the conical hole, the spherical surface presses against the conical hole, and the upper part is spaced from the upper end of the conical hole. The top pressure sleeve forms a fitting part and a deformable part. The middle through hole has two functions: first, to prevent the upper part of the ball head from contacting the top pressure sleeve so as to form a gap; second, to reduce the strength of the deformable part and make it more conducive to its deformation.

[0033] In other embodiments, the elastic ring can also be provided as a gasket structure, or a rubber ball is provided between the ball head and the retaining platform to replace the elastic ring, i.e. as an elastic member; the top pressing member can also be provided as a strip structure, or a cross structure with two strip structures intersecting; the outer side of the abutting portion of the top pressing member can also not abut the inner wall of the outer sleeve (the shell), at this time the function of the deformation portion is only to make the top pressing member have a downward moving tendency, so that the top pressing member is buckled on the ball head.

[0034] The embodiments of the orthopedic adjusting rod of the present application are the same as the structure of the orthopedic adjusting rod in the above-mentioned embodiments of the external fixation frame system, and will not be described again.

[0035] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An orthopedic adjustment rod comprising a rod body extending in a vertical direction and a ball head provided at an upper end of the rod body, characterized in that: The ball head is sleeved with a shell, the shell is spirally provided with a locking rod, a pressing part is arranged between the locking rod and the ball head, the pressing part has a fitting part and a deformation part, the fitting part is fitted with the ball head, and the deformation part has a space with the ball head, the locking rod is pressed at the position of the deformation part, the fitting part has a fitting surface which is top-pressed with the inner wall of the shell, the pressing part is a pressing sleeve, the inner wall of the pressing sleeve has a space with the ball head at the middle position, forming the deformation part, the edge position of the inner wall of the pressing sleeve is fitted with the ball head, forming the fitting part, and the outer wall of the edge position of the pressing sleeve is top-pressed with the inner wall of the shell, forming the fitting surface.

2. The orthopedic adjustment rod of claim 1, wherein: A spring part is arranged between the ball head and the shell, and the spring part is located at a position opposite to the pressing part.

3. The orthopedic adjustment rod of claim 2, wherein: The spring part is an elastic ring which is sleeved on the ball head.

4. An external fixation frame system comprising a fixation ring and an orthopedic adjustment rod connected to the fixation ring, characterized in that: The orthopedic adjusting rod is the orthopedic adjusting rod as claimed in any one of claims 1-3.

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