Joint repositor

Abstract

The utility model relates to the field of orthopedic medical instruments, in particular to a joint repositor. When the joint repositor is used, under the normal condition, the lower support can be adjusted through the angle adjusting mechanism to drive the ankle to conduct angle adjustment, if fulcrum adjustment needs to be conducted, the position of the hinged fulcrum is adjusted through the fulcrum adjusting mechanism, and at the moment, the ankle can be driven to move front and back; the lower support can drive the ankle to accurately adjust the position, and dislocation of the talus caused by the fact that the ankle joint and the fulcrum are not coaxial is avoided.

Description

Technical Field

[0001] This utility model relates to the field of orthopedic medical devices, specifically to a joint repositioning device. Background Technology

[0002] The ankle joint is formed by the articular surfaces of the lower ends of the tibia and fibula and the trochlea of ​​the talus. The talus is one of the key weight-bearing bones of the foot, and its dislocation usually affects foot function, causes pain or gait abnormalities, and may even be accompanied by soft tissue injury or impaired blood supply.

[0003] This type of external fixator, called an ankle joint reducer or talus dislocation adjuster, is a specialized medical device used to treat talus dislocation. It is designed to reduce the talus to its anatomical position through precise mechanical adjustment and fixation, and to reduce the risk of further damage.

[0004] In the prior art, Chinese utility model patent with authorization announcement number CN202044325U discloses an external fixation brace for clubfoot, which includes an upper bracket for connecting to the tibia and a lower bracket for connecting to the ankle. The upper and lower brackets are connected at the middle by a universal joint. An anterior adjustment mechanism and a posterior adjustment mechanism are provided between the upper and lower brackets. Adjustment of these two mechanisms allows the lower bracket to adjust the angle of the ankle. However, the rotation position of this brace during adjustment is at the hinge point of the universal joint, which can easily cause talus dislocation during adjustment. Utility Model Content

[0005] This invention provides a joint repositioning device to solve the problem that the talus is prone to dislocation during adjustment of existing repositioning devices.

[0006] The joint repositioning device of this utility model adopts the following technical solution:

[0007] A joint repositioning device includes an upper support and a lower support arranged at an interval, and an angle adjustment mechanism disposed between the two. A hinge rod with a hinge fulcrum is provided at the middle position of the upper support and the lower support. The hinge rod is provided with a fulcrum adjustment mechanism, which is used to adjust the front and rear position of the hinge fulcrum in the front and rear direction.

[0008] The fulcrum adjustment mechanism includes a base extending in the front-rear direction and a slider slidably disposed on the base. One of the base and the slider is connected to the upper support and the other is connected to the lower support. The slider is driven by a nut screw mechanism.

[0009] The nut and screw mechanism includes a screw rotatably mounted on the base, the screw being threadedly engaged with the slider, and a damping structure being provided between the screw and the base.

[0010] The damping structure includes a damping plate disposed between the lead screw and the base.

[0011] The base is provided with a wedge-shaped groove, and the slider is a wedge-shaped structure adapted to the wedge-shaped groove.

[0012] The hinge rod includes an upper connecting rod connected to the upper bracket and a lower connecting rod connected to the lower bracket. The hinge fulcrum is a universal joint set on the lower connecting rod, and the fulcrum adjustment mechanism is set between the universal joint and the upper connecting rod.

[0013] The angle adjustment mechanism includes a front adjustment mechanism and a rear adjustment mechanism.

[0014] The beneficial effects of this utility model are as follows: When the joint reduction device of this utility model is in use, under normal circumstances, the angle adjustment mechanism can adjust the lower support to drive the ankle to adjust the angle. If the fulcrum needs to be adjusted, the position of the hinge fulcrum can be adjusted by the fulcrum adjustment mechanism. At this time, the ankle can be driven to move back and forth, so that the lower support can drive the ankle to adjust the accurate position, avoiding talus dislocation caused by the misalignment of the ankle joint and the fulcrum. Attached Figure Description

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

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the joint repositioning device of this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the external structure of the central pivot adjustment mechanism;

[0018] Figure 3 A half-sectional schematic diagram of the fulcrum adjustment mechanism;

[0019] Figure 4 A schematic diagram of the cross-section at the slider position of the fulcrum adjustment mechanism;

[0020] In the picture:

[0021] 1. Tibia; 11. Ankle;

[0022] 2. Install the fixing ring;

[0023] 3. Lower fixing ring;

[0024] 4. Front adjustment mechanism; 41. First link; 42. Second link;

[0025] 5. Lower support; 51. Semi-ring;

[0026] 6. Pivot adjustment mechanism; 61. Base; 62. Lead screw; 63. Damping plate; 64. Slider; 65. Connector;

[0027] 7. Upper connecting rod;

[0028] 8. Lower connecting rod; 81. Universal joint;

[0029] 9. Rear adjustment mechanism; 91. Third link; 92. Fourth link; 93. Fifth link. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In this embodiment of the joint reduction device of the present invention, the joint reduction device is applied to the ankle joint, such as... Figures 1 to 4 As shown, a joint reduction device includes an upper support and a lower support 5 arranged at intervals, and an angle adjustment mechanism between the two. A hinge rod with a hinge fulcrum is provided at the middle position of the upper support and the lower support 5. A fulcrum adjustment mechanism 6 is provided on the hinge rod. The fulcrum adjustment mechanism 6 is used to adjust the front and back position of the hinge fulcrum in the front and back direction of the ankle 11.

[0032] In this embodiment, the upper support includes an upper fixing ring 2 and a lower fixing ring 3 spaced apart vertically, and the two fixing rings are connected to the tibia via bone pins. The lower support 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, such as... Figure 1 As shown, the front adjustment mechanism 4 includes a first link 41 and a second link 42. The first link 41 is connected to the lower fixed ring 3 via a transverse connecting member, and the second link 42 is connected to the semi-ring 51 via a connecting member. A universal joint is provided between the first link 41 and the second link 42. The rear adjustment mechanism 9 includes a third link 91, a fourth link 92, and a fifth link 93. The fourth link 92 and the fifth link 93 are hinged together.

[0033] The fulcrum adjustment mechanism 6 includes a base 61 extending in the front-rear direction and a slider 64 slidably disposed on the base 61. One of the base 61 and the slider 64 is connected to the upper bracket, and the other is connected to the lower bracket 5. The slider 64 is driven by a nut and screw mechanism. In this embodiment, the hinge rod includes an upper connecting rod 7 connected to the upper bracket and a lower connecting rod 8 connected to the lower bracket 5. The hinge fulcrum is a universal joint 81 disposed on the lower connecting rod 8. The base 61 is fixedly connected to the upper connecting rod 7, and the slider 64 is fixedly connected to the universal joint 81. The nut and screw mechanism drives the universal joint 81 to move back and forth.

[0034] Specifically, the nut and screw mechanism includes a screw 62 rotatably mounted on a base 61. The screw 62 is threadedly engaged with a slider 64, and a damping structure is provided between the screw 62 and the base 61. The damping structure provides a certain rotational resistance to prevent the nut and screw mechanism from loosening. The damping structure includes a damping plate 63 disposed between the screw 62 and the base 61. Using a damping plate 63 simplifies the structure and reduces manufacturing costs.

[0035] In this embodiment, the base 61 is provided with a wedge-shaped groove, and the slider 64 is a wedge-shaped structure adapted to the wedge-shaped groove. The wedge-shaped structure can provide precise fitting accuracy and prevent the slider 64 from becoming loose. In this embodiment, a connector 65 is installed on the slider through a threaded structure. The connector 65 is used to connect to the universal joint 81.

[0036] In practical applications, the main factor causing talus dislocation is that the hinge fulcrum of the support and the rotation axis of the ankle joint are not aligned. In this case, if the support rotates according to the hinge fulcrum, the ankle joint will be subjected to tension, causing talus dislocation. The joint reduction device of this invention adjusts the position of the hinge fulcrum through the fulcrum adjustment mechanism 6. This allows the ankle 11 to move forward and backward, adjusting the position of the hinge fulcrum and thus accurately positioning the ankle 11, preventing talus dislocation caused by misalignment between the ankle joint and the fulcrum.

[0037] In this embodiment, the joint repositioning device is applied to the ankle joint for repositioning. In this case, the upper support is the tibial support and the lower support is the foot and ankle support. In other embodiments, the joint repositioning device can also be applied to the repositioning of other joints, such as the knee joint. In this case, the upper and lower supports need to be connected to the two bones on the joint.

[0038] In other embodiments of this utility model, the slider can also be driven by other mechanisms, such as a gear and rack mechanism, where the rotation of the gear drives the rack to move, thereby driving the slider to move. Alternatively, no driving mechanism can be set, and the slider can be operated manually. Once in position, a locking mechanism can be used to lock it directly. A damping structure can also be set between the slider and the base. The slider and the base can also be fitted together by a dovetail groove structure.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A joint reduction device, comprising an upper support and a lower support arranged at an interval, and an angle adjustment mechanism disposed between the two, wherein a hinge rod with a hinge fulcrum is provided at the middle position of the upper support and the lower support, characterized in that: The hinge rod is provided with a fulcrum adjustment mechanism, which is used to adjust the front and rear positions of the hinge fulcrum in the front and rear direction.

2. The joint reduction device according to claim 1, characterized in that: The fulcrum adjustment mechanism includes a base extending in the front-rear direction and a slider slidably disposed on the base. One of the base and the slider is connected to the upper support and the other is connected to the lower support. The slider is driven by a nut screw mechanism.

3. The joint reduction device according to claim 2, characterized in that: The nut and screw mechanism includes a screw rotatably mounted on the base, the screw being threadedly engaged with the slider, and a damping structure being provided between the screw and the base.

4. The joint reduction device according to claim 3, characterized in that: The damping structure includes a damping plate disposed between the lead screw and the base.

5. The joint reduction device according to claim 2, characterized in that: The base is provided with a wedge-shaped groove, and the slider is a wedge-shaped structure adapted to the wedge-shaped groove.

6. The joint reduction device according to claim 1, characterized in that: The hinge rod includes an upper connecting rod connected to the upper bracket and a lower connecting rod connected to the lower bracket. The hinge fulcrum is a universal joint set on the lower connecting rod, and the fulcrum adjustment mechanism is set between the universal joint and the upper connecting rod.

7. The joint reduction device according to claim 1, characterized in that: The angle adjustment mechanism includes a front adjustment mechanism and a rear adjustment mechanism.

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