Dual-mode adjusting rod and joint repositor using same

Abstract

The invention relates to the technical field of external fixing frames, in particular to a dual-mode adjusting rod and a joint repositor using the same. The dual-mode adjusting rod has three states, namely quick adjustment, fine adjustment and locking, during quick adjustment, the switching cap drives the locking block to be separated from the screw rod, at the moment, the rotating cap is not connected with the screw rod and can freely slide on the screw rod, quick adjustment of the overall length of the adjusting rod is achieved, during fine adjustment, the switching cap drives the locking block to be in threaded fit with the screw rod, and locking is achieved. When locking is needed, the switching cap drives the locking block to abut against and lock the screw rod and cannot rotate, and then the locking cap locks the rotating cap, so that the rotating cap, the connecting pipe and the screw rod are locked.

Description

Technical Field

[0001] The present invention relates to the technical field of external fixators, and particularly relates to a dual-mode adjusting rod and a joint reducer using the same. Background Art

[0002] In orthopedic treatment, an external fixator is required to complete the alignment and reduction of bones. The external fixator mainly includes a fixing ring and an adjusting rod, and the adjusting rod plays a major role in length adjustment. For the reduction of joint positions, a special orthopedic bracket is needed. For example, the patent with the application number 2025201409885 applied by the applicant on January 21, 2025 discloses a joint reducer. During subsequent research and development, it was found that the adjusting rod in this joint reducer needs to have fast adjustment and slow adjustment functions. Summary of the Invention

[0003] The present invention provides a dual-mode adjusting rod to enable the existing joint reducer to have fast adjustment and slow adjustment functions; at the same time, the present invention also provides a joint reducer using the adjusting rod.

[0004] The following technical scheme is adopted for a dual-mode adjusting rod of the present invention: A dual-mode adjusting rod includes a screw rod axially extending in the front-rear direction and an adjusting tube. The adjusting tube includes a connecting tube and a rotating cap rotatably assembled therewith. A locking block is rotatably provided on the rotating cap. The locking block has a fine adjustment position threadedly engaged with the screw rod, a locking position in which it is in top pressure locking engagement with the screw rod, and a fast adjustment position in which it is disengaged from the screw rod. A switching cap is provided on the rotating cap, and the switching cap is used to drive the locking block to switch between the fine adjustment position, the locking position, and the fast adjustment position. A locking cap is provided on the rotating cap for locking its rotation.

[0005] The rotating shaft of the locking block extends in the front-rear direction, and the switching cap is rotatably engaged with the rotating cap.

[0006] The locking block is provided with a fine adjustment groove corresponding to the fine adjustment position, a locking groove corresponding to the locking position, and a fast adjustment groove corresponding to the fast adjustment position. The connection line between the fine adjustment groove and the rotating shaft of the locking block is in the radial direction of the rotating cap. The fine adjustment groove and the fast adjustment groove are arranged on both sides of the fine adjustment groove. The switching cap is provided with a matching portion for cooperating with the fine adjustment groove, the fast adjustment groove, and the locking groove.

[0007] A spring piece is provided on the switching cap. The spring piece has a V-shaped structure, and the corner position of the V-shaped structure forms the matching portion.

[0008] The locking block is provided with teeth threadedly engaged with the screw rod, and a plurality of the teeth are provided.

[0009] The distance between the locking groove and the rotating shaft of the locking block is greater than the distance between the quick adjustment groove and the rotating shaft, and the projection of the tooth in the vertical direction is located between the locking groove and the rotating shaft.

[0010] A clamping groove is provided on the connecting pipe. The locking cap is slidably matched with the rotating cap in the front-back direction, and a locking piece capable of being clamped into the clamping groove is provided on the locking cap.

[0011] The rotating shaft of the locking block extends in the left-right direction. The switching cap is slidably matched with the rotating cap in the front-back direction. A fine adjustment groove corresponding to the fine adjustment position, a locking groove corresponding to the locking position, and a quick adjustment groove corresponding to the quick adjustment position are provided on the locking block. The connection line between the fine adjustment groove and the rotating shaft of the locking block is in the radial direction of the rotating cap. The fine adjustment groove and the quick adjustment groove are arranged on both sides of the fine adjustment groove. A matching portion for cooperating with the fine adjustment groove, the quick adjustment groove, and the locking groove is provided on the switching cap.

[0012] A spring piece is provided on the switching cap. The spring piece has a V-shaped structure, and the corner position of the V-shaped structure forms the matching portion.

[0013] A joint reduction device of the present invention adopts the following technical solution:

[0014] A joint reduction device includes an upper bracket, a lower bracket arranged at intervals up and down, and an angle adjustment mechanism arranged between the two. An articulated rod with an articulated fulcrum is provided at the middle positions of the upper bracket and the lower bracket. The angle adjustment mechanism includes a length adjustment rod, and the length adjustment rod is a dual-mode adjustment rod as described above.

[0015] The beneficial effects of the present invention are as follows: The dual-mode adjustment rod of the present invention has three states, namely quick adjustment, fine adjustment, and locking. During quick adjustment, the switching cap drives the locking block to disengage from the screw. At this time, the rotating cap is not connected to the screw and can slide freely on the screw to achieve rapid adjustment of the overall length of the adjustment rod. During fine adjustment, the switching cap drives the locking block to be in threaded cooperation with the screw. At this time, a threaded structure is formed between the rotating cap and the screw. When the rotating cap rotates, it can drive the screw to expand and contract. When locking is required, the switching cap drives the locking block to press and lock with the screw, and rotation cannot be formed. At this time, the rotating cap is locked by the locking cap, so that the rotating cap, the connecting pipe, and the screw are locked. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 Structural schematic diagram of the adjusting tube in Embodiment 1 of a dual-mode adjusting rod of the present invention;

[0018] Figure 2 is Figure 1 partial enlarged view at A in;

[0019] Figure 3 coordination schematic diagram of the adjusting tube and the screw;

[0020] Figure 4 is Figure 3 partial enlarged view at B in (fine-tuning state);

[0021] Figure 5 schematic diagram of the locking state of the adjusting tube and the screw;

[0022] Figure 6 schematic diagram of the quick adjustment state of the adjusting tube and the screw;

[0023] Figure 7 installation schematic diagram of the elastic piece;

[0024] Figure 8 is Figure 7 partial enlarged view at B in;

[0025] Figure 9 structural schematic diagram of the locking block;

[0026] Figure 10 is Figure 9 bottom view of;

[0027] Figure 11 stereogram of the locking block;

[0028] Figure 12 structural schematic diagram of the connecting tube;

[0029] In the figure: 1, rotating cap; 11, limiting groove;

[0030] 2, switching cap; 21, first avoidance groove; 22, second avoidance groove; 23, through groove; 24, installation groove; 3, locking block; 31, fine-tuning groove; 32, quick-adjustment groove; 33, locking groove; 34, teeth;

[0031] 4, connecting tube; 41, clamping groove;

[0032] 5, locking piece; 6, snap ring; 7, screw; 8, elastic piece; 9, locking cap.

[0033] Figure 13 is an embodiment of a joint repositioner;

[0034] In the figure:

[0035] 1, tibia; 11, foot and ankle;

[0036] 2. Upper fixing ring

[0037] 3. Lower fixing ring

[0038] 4. Front adjusting mechanism; 41. First connecting rod; 42. Second connecting rod

[0039] 5. Lower bracket; 51. Half ring

[0040] 6. Fulcrum adjusting mechanism

[0041] 7. Upper connecting rod

[0042] 8. Lower connecting rod; 81. Universal joint

[0043] 9. Rear adjusting mechanism; 91. Third connecting rod; 92. Fourth connecting rod; 93. Fifth connecting rod Specific implementation manner

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment 1 of a dual-mode adjusting rod of the present invention: As Figures 1 to 12 shown, a dual-mode adjusting rod includes a screw rod 7 extending axially in the front-rear direction and an adjusting tube. The adjusting tube includes a connecting tube 4 and a rotating cap 1 rotatably assembled therewith. A locking block 3 is rotatably provided on the rotating cap 1. The locking block 3 has a fine-tuning position in threaded cooperation with the screw rod 7, a locking position in pressing and locking cooperation with the screw rod 7, and a quick-adjustment position disengaged from the screw rod 7. A switching cap 2 is provided on the rotating cap 1, and the switching cap 2 is used to drive the locking block 3 to switch between the fine-tuning position, the locking position, and the quick-adjustment position. A locking cap 9 is provided on the rotating cap 1 for locking its rotation.

[0046] As Figure 1 、 Figure 2 and Figure 12As shown, a clamping groove 41 is provided on the connecting pipe 4. The locking cap 9 and the rotating cap 1 are in sliding fit in the front and rear directions, and there is a circumferential anti-rotation fit between the locking cap 9 and the rotating cap 1. A locking piece 5 that can be inserted into the clamping groove 41 is provided on the locking cap 9. The circumferential side wall of the clamping groove 41 is a vertical surface. In this way, when the locking piece 5 is inserted into the clamping groove 41, the side walls can be in abutting fit with each other, realizing the circumferential relative fixation among the connecting pipe 4, the rotating cap 1, and the locking cap 9. A plurality of clamping grooves 41 are evenly distributed along the circumference of the connecting pipe 4. Correspondingly, a plurality of locking pieces 5 are also provided. In this way, through the cooperation of the plurality of clamping grooves 41 and the locking pieces 5, the reliability of locking can be improved. A snap ring 6 is provided at the front end of the connecting pipe 4, and an annular groove that rotates in cooperation with the clamping groove 41 is provided on the rotating cap 1, that is, the connecting pipe 4 and the rotating cap 1 are rotationally connected through the snap ring 6.

[0047] The specific shape of the locking piece 5 is as Figure 2 shown. Its front end is inserted and fixed on the locking cap 9, and the rear end is arc-shaped, which is convenient for moving in and out of the clamping groove 41 in the front and rear directions. The front and rear ends are connected by an inclined section. A slot is provided at the rear end of the rotating sleeve, and the rear end of the locking piece 5 is connected to the connecting pipe 4 through the slot. A limiting groove 11 is provided on the front side wall of the slot. When the locking cap 9 is pushed forward, the locking cap 9 drives the locking piece 5 to move forward. Under the elastic action of the locking piece 5, its rear end enters the limiting groove 11.

[0048] As Figure 3 and Figure 4 shown, a spring piece 8 is provided on the switching cap 2. The spring piece 8 has a V-shaped structure, and a matching part is formed at the corner position of the V-shaped structure. The free end of the V-shaped structure of the spring piece 8 is provided with a horizontally extending section that extends outward. The horizontally extending section and the switching cap 2 are in sliding fit, which is convenient for the deformation of the spring piece 8.

[0049] The switching cap 2 is provided with a matching part for cooperating with the fine adjustment groove 31, the quick adjustment groove 32, and the locking groove 33. In this embodiment, the matching part is the corner position of the V-shaped structure of the spring piece 8.

[0050] In this embodiment, as Figure 4 shown, the rotating shaft of the locking block 3 extends in the front and rear directions. In this way, the locking block 3 can rotate in a plane parallel to the cross-section of the rotating cap 1. At the same time, the switching cap 2 and the rotating cap 1 are in rotational fit. In this way, the switching cap 2 can drive the locking block 3 to rotate to the corresponding position through the spring piece 8.

[0051] The structure of the locking block 3 is as Figure 9 , Figure 10 and Figure 11As shown, the locking block 3 is provided with a fine-tuning groove 31 corresponding to the fine-tuning position, a locking groove 33 corresponding to the locking position and a quick-adjusting groove 32 corresponding to the quick-adjusting position. The line connecting the fine-tuning groove 31 and the rotating shaft of the locking block 3 is in the radial direction of the rotating cap 1, that is, the line connecting the centers of the arc r of the fine-tuning groove 31 and the arc R of its rotating shaft passes through the center of the rotating cap 1. In this way, when the spring piece 8 is inserted into the fine-tuning groove 31, the spring piece 8 and the fine-tuning groove 31 are pressed together, and the direction of the elastic force of the spring piece 8 on the fine-tuning groove 31 passes through the radial direction of the rotating cap 1, which is in a stable state, limiting the locking block 3 to be as shown in FIG. Figure 4 At this time, the teeth 34 on the locking block 3 and the threads on the screw rod 7 are threadedly matched, and the rotating sleeve is threadedly connected with the screw rod 7 through the locking block 3.

[0052] The locking block 3 has a plurality of teeth 34 that are threadably matched with the screw rod 7, which can provide a more stable match.

[0053] The fine adjustment slot 31 and the quick adjustment slot 32 are arranged on both sides of the fine adjustment slot 31, and the distance between the locking slot 33 and the rotating shaft of the locking block 3 is greater than the distance between the quick adjustment slot 32 and the rotating shaft. The projection of the teeth 34 in the vertical direction is between the locking slot 33 and the rotating shaft, and the position of the teeth 34 is relatively close to the rotating shaft position of the locking block 3, so that when the spring piece 8 is inserted into the locking slot 33, the force arm formed by the action of the spring piece 8 is large, and a reliable locking force can be provided. On the contrary, the quick adjustment slot 32 is close to the rotating shaft, and the position of the quick adjustment slot 32 has an upward tilting angle, so that the spring piece 8 drives the locking block 3 to move downward a small distance to make the teeth 34 of the locking block 3 move upward a sufficient distance, so that the teeth 34 are separated from the threads on the screw 7.

[0054] like Figures 4 - 8 As shown, the switching cap 2 is provided with a first avoidance groove 21 and a second avoidance groove 22. The two avoidance grooves are used to prevent the inner wall of the switching cap 2 from blocking the movement of the locking block 3 when the locking block 3 is rotated to the locking position and the quick adjustment position. A through groove 23 is provided between the two avoidance grooves, and the corner of the spring piece 8 extends from this through groove 23 to cooperate with the locking block 3. The switching cap 2 is provided with a mounting groove 24 for mounting the spring piece 8. The cross-sectional shape of the mounting groove 24 is a long strip hole structure with narrow sides in the middle. The through groove 23 and the mounting groove 24 are connected. During installation, the spring piece 8 is inserted into the mounting groove 24 by relying on its own elasticity. When it moves to the position of the through groove 23, the corner pops out from the through groove 23 and is installed in place.

[0055] When the adjusting rod of the present invention is in use, it has three states, namely the fine-tuning state, the locking state, and the quick-adjustment state. In the fine-tuning state, a nut-screw mechanism is formed between the screw rod 7 and the adjusting tube, and by rotating the rotating cap 1, the length of the adjusting rod can be adjusted; in the locking state, the screw rod 7 and the adjusting tube are in a locked state, and the length between them cannot be adjusted; in the quick-adjustment state, the adjusting tube and the screw rod 7 are circumferentially slidably connected, and the length of the adjusting rod can be quickly adjusted.

[0056] Next, the working processes of the three states will be introduced in detail respectively:

[0057] Fine-tuning state, as Figure 4 shown, at this time the switching cap 2 rotates to the middle position, driving the elastic piece 8 into the fine-tuning groove 31 on the locking block 3. With the cooperation of the elastic piece 8 and the fine-tuning groove 31, the locking block 3 is in the middle position. At this position, the teeth 34 on the locking block 3 are threadedly engaged with the screw rod 7. At this time, rotating the rotating cap 1, the rotating cap 1 drives the screw rod 7 to extend or shorten under the action of the threaded engagement, realizing the adjustment of the length. At this time, the cooperation of the elastic piece 8 and the fine-tuning groove 31 prevents the locking block 3 from rotating excessively under the action of friction during the rotation;

[0058] Locking state, as Figure 5 shown, at this time the switching cap 2 rotates to the rightmost position, driving the elastic piece 8 into the locking groove 33. At this time, the elastic piece 8 presses against the locking block 3, so that the teeth 34 on the locking block 3 press against the thread on the screw rod 7. At this time, under the action of friction, the rotating sleeve and the screw rod 7 cannot rotate, realizing the locking.

[0059] Quick-adjustment state, as Figure 6 shown, at this time the switching cap 2 rotates to the leftmost position, driving the elastic piece 8 into the quick-jump groove. At this time, the elastic piece 8 presses against the locking block 3, causing its right side to tilt up, and the teeth 34 are disengaged from the screw rod 7. At this time, the rotating sleeve can slide on the screw rod 7, thereby realizing the quick adjustment of the length.

[0060] Embodiment 2: In this embodiment, the rotating shaft of the locking block extends in the left-right direction. At this time, the locking block rotates in the front-back direction (the axial direction of the rotating sleeve). At this time, the switching cap and the rotating cap are slidably engaged in the front-back direction. The locking block is provided with a fine-tuning groove corresponding to the fine-tuning position, a locking groove corresponding to the locking position, and a quick-adjustment groove corresponding to the quick-adjustment position. The connection line between the fine-tuning groove and the rotating shaft of the locking block is in the radial direction of the rotating cap. The fine-tuning groove and the quick-adjustment groove are arranged on both sides of the fine-tuning groove. The switching cap is provided with a matching portion for cooperating with the fine-tuning groove, the quick-adjustment groove, and the locking groove. Specifically, the shape of the locking block is the same as the structure of the locking block in Embodiment 1. At the same time, the switching cap is also provided with an elastic piece having the same structure as that in Embodiment 1 to form the above-mentioned matching portion.

[0061] In other embodiments, the fine-tuning groove may not be provided on the locking block, and in this case, a corresponding mechanism is required to limit the position of the switching cap; the fine-tuning groove may also be set as a U-shaped groove structure, and in this case, the shape of the elastic piece is adapted to it; the rotation of the rotating cap can also be locked by a double-nut structure.

[0062] Embodiment of the joint reduction device of the present invention: In this embodiment, the joint reduction device is applied to the ankle joint, as Figures 1 to 4 shown, a joint reduction device includes an upper bracket, a lower bracket 5 arranged at intervals up and down, and an angle adjustment mechanism arranged between the two. At the middle positions of the upper bracket and the lower bracket 5, there is a hinge rod with a hinge fulcrum, and a fulcrum adjustment mechanism 6 is arranged on the hinge rod. The fulcrum adjustment mechanism 6 is used to adjust the front and rear positions of the hinge fulcrum in the front and rear directions of the ankle 11.

[0063] In this embodiment, the upper bracket includes an upper fixing ring 2 and a lower fixing ring 3 arranged at intervals up and down. The two fixing rings are connected to the tibia through bone pins. The lower bracket 5 includes a right-angle connecting piece and a semi-ring 51 connected thereto. The angle adjustment mechanism includes a front adjustment mechanism 4 and a rear adjustment mechanism 9, as Figure 1 shown, the front adjustment mechanism 4 includes a first connecting rod 41 and a second connecting rod 42. The first connecting rod 41 is connected to the lower fixing ring 3 through a transverse connecting piece, and the second connecting rod 42 is connected to the semi-ring 51 through a connecting piece. A universal joint is arranged between the first connecting rod 41 and the second connecting rod 42. The rear adjustment mechanism 9 includes a third connecting rod 91, a fourth connecting rod 92 and a fifth connecting rod 93. The fourth connecting rod 92 and the fifth connecting rod 93 are hinged.

[0064] In the actual application process, the main factor causing talus dislocation is that the hinge fulcrum of the bracket and the rotation axis of the ankle joint are not coaxial. In this case, if the rotation is carried out according to the hinge fulcrum of the bracket, the ankle joint will be driven to be subjected to a pulling force, resulting in talus dislocation. For the joint reduction device of the present invention, the position of the hinge fulcrum is adjusted through the fulcrum adjustment mechanism 6. At this time, the ankle 11 can be driven to move back and forth, so that the position of the hinge fulcrum is adjusted, thereby driving the ankle 11 to be adjusted to an accurate position, and avoiding talus dislocation caused by the non-coaxiality of the ankle joint and the fulcrum.

[0065] In this embodiment, the joint reduction device is applied to the reduction of the ankle joint. At this time, the upper bracket is the tibia bracket, and the lower bracket is the ankle bracket. In other embodiments, the joint reduction device can also be applied to the reduction of other joints, such as the knee joint. At this time, the upper bracket and the lower bracket only need to be connected to the two bones on the joint.

[0066] In this embodiment, the third connecting rod 91, the first connecting rod 41 and the second connecting rod 42 can adopt the structures in the embodiment of the above-mentioned dual-mode adjusting rod. In this way, in the process of starting the adjustment, various adjustment modes in the early stage can be realized through quick adjustment and fine adjustment.

[0067] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dual-mode adjusting rod, comprising a screw rod axially extending in the front-rear direction and an adjusting tube, characterized in that: The adjusting pipe includes a connecting pipe and a rotating cap rotatably assembled therewith. A locking block is rotatably provided on the rotating cap. The locking block has a fine-tuning position in threaded cooperation with the screw rod, a locking position in pressing and locking cooperation with the screw rod, and a quick-adjustment position disengaged from the screw rod. A switching cap is provided on the rotating cap, and the switching cap is used to drive the locking block to switch between the fine-tuning position, the locking position and the quick-adjustment position. A locking cap is provided on the rotating cap for locking its rotation.

2. The dual-mode adjusting lever according to claim 1, wherein: The rotating shaft of the locking block extends in the front-rear direction, and the switching cap is rotatably engaged with the rotating cap.

3. The dual-mode adjusting lever according to claim 2, characterized in that: The locking block is provided with a fine-tuning groove corresponding to the fine-tuning position, a locking groove corresponding to the locking position, and a quick-adjustment groove corresponding to the quick-adjustment position. The connection line between the fine-tuning groove and the rotating shaft of the locking block is in the radial direction of the rotating cap. The fine-tuning groove and the quick-adjustment groove are arranged on both sides of the fine-tuning groove. The switching cap is provided with a matching portion for cooperating with the fine-tuning groove, the quick-adjustment groove and the locking groove.

4. A dual-mode adjusting lever according to claim 3, characterized in that: A spring piece is provided on the switching cap. The spring piece has a V-shaped structure, and the corner position of the V-shaped structure forms the matching portion.

5. A dual-mode adjusting lever according to claim 4, characterized in that: The locking block is provided with teeth in threaded cooperation with the screw rod, and there are multiple teeth.

6. The dual-mode adjusting lever according to claim 5, characterized in that: The distance between the locking groove and the rotating shaft of the locking block is greater than the distance between the quick-adjustment groove and the rotating shaft. The projection of the teeth in the up-down direction is between the locking groove and the rotating shaft.

7. A dual-mode adjusting lever according to claim 6, characterized in that: A clamping groove is provided on the connecting pipe. The locking cap is slidably engaged with the rotating cap in the front-rear direction, and a locking piece capable of being clamped into the clamping groove is provided on the locking cap.

8. A dual-mode adjusting lever according to claim 1, characterized in that: The rotating shaft of the locking block extends in the left-right direction, the switching cap is slidably engaged with the rotating cap in the front-rear direction, the locking block is provided with a fine-tuning groove corresponding to the fine-tuning position, a locking groove corresponding to the locking position, and a quick-adjustment groove corresponding to the quick-adjustment position. The connection line between the fine-tuning groove and the rotating shaft of the locking block is in the radial direction of the rotating cap. The fine-tuning groove and the quick-adjustment groove are arranged on both sides of the fine-tuning groove. The switching cap is provided with a matching portion for cooperating with the fine-tuning groove, the quick-adjustment groove and the locking groove.

9. A dual-mode adjusting lever according to claim 8, wherein: A spring piece is provided on the switching cap. The spring piece has a V-shaped structure, and the corner position of the V-shaped structure forms the matching portion.

10. An arthroscopic reduction device, comprising an upper bracket and a lower bracket arranged at an interval up and down, and an angle adjustment mechanism arranged between the two. An articulated rod with a hinge fulcrum is arranged at the middle positions of the upper bracket and the lower bracket. It is characterized in that: The angle adjusting mechanism includes a length adjusting rod, and the length adjusting rod is a dual-mode adjusting rod as described in any one of claims 1-9.

Images