Rehabilitation device for passive movement of ankle joint

Abstract

The rehabilitation device comprises a base, a rotatable shank fixing plate is arranged on the base, one end of the shank fixing plate is provided with a first bandage used for binding a shank, the other end of the shank fixing plate is rotationally connected with one end of a telescopic rod, and the other end of the telescopic rod is provided with a ball head; the ball head is movably connected with a ball hinge of the foot fixator, the ball hinge is fixed to the bottom of a sole fixing plate, the sole fixing plate is connected with one end of a sole supporting plate, a second binding band used for binding the sole is arranged on the sole fixing plate, and a third binding band used for binding the heel is connected to the second binding band or the sole fixing plate. The device can adapt to the internal and external rotation angles of the lower limbs of the patient, and allows the shank structure part and the base part to freely rotate inwards and outwards. A motion limiting structure is not designed at the position around the ankle joint, and free dorsiflexion-plantar flexion motion of the ankle joint is allowed.

Description

Technical Field

[0001] The invention relates to a rehabilitation device for passive movement of ankle joints, belonging to the field of medical equipment. Background Art

[0002] Diseases such as stroke and nerve damage can cause ankle dysfunction. Foot drop is caused by the weaker dorsiflexor strength of the ankle than the plantar flexor strength or the complete loss of dorsiflexor strength, which leads to the drop of the forefoot. Failure to actively intervene can cause symptoms such as thrombosis, tissue necrosis, and muscle atrophy. This type of disease is often treated by rehabilitation therapists or trained professionals to passively move the ankle joint, which is costly and difficult to quantify, and poses a challenge to the formulation of a systematic rehabilitation program. Some researchers have tried to develop devices or equipment for passive ankle movement to help patients perform dorsiflexion-plantar flexion activities, but such equipment may ignore the physiological angle of internal and external rotation of the patient's lower limbs, and fix the vertical coronal surface of the sole of the foot outward, making the equipment difficult to apply to patients, or the preset ankle rotation axis cannot match individual patients, and the ankle joint may be compressed or injured during use.

[0003] The existing patent CN215021672U "A passive ankle joint trainer" has a horizontal structure and is not suitable for bedridden patients. The device has no fixing device for the limbs, and the ankle joint cannot completely follow the movable plate during use, making it difficult to effectively move the ankle joint.

[0004] The existing patent CN215459050U "A passive motion auxiliary brace for ankle joint" has a structure that is difficult to use for bedridden patients, and the heel or the convex structure near the knee joint is prone to get stuck with the surrounding environment such as bedding.

[0005] The existing patent CN219184752U "An ankle joint passive activity training device" presets the rotation axis of the ankle joint. Due to the difference in individual rotation axes, it cannot be matched to most patients, resulting in a small activity angle or direct compression of the ankle joint. In addition, the toes of the device point straight ahead of the body, ignoring the fact that most people have a certain external rotation angle in their lower limbs, making it difficult to adapt to individual patients.

[0006] Through the above existing patents, we can summarize the main pain points of current devices, including:

[0007] ① The foot structure is fixed and points to the front, ignoring the internal and external rotation angles of the lower limbs. For example, patients with muscle stiffness or foot drop have fixed internal and external rotation angles, and it is difficult for such patients to use this type of device;

[0008] ② The rotation axis of the ankle joint is preset. Due to the individual differences in the rotation axis of the ankle joint, this fixed rotation axis is difficult to match for most patients. If the rotation axis does not match, the ankle joint will be detached from the device or stuck in the main joint during passive dorsiflexion-plantar flexion;

[0009] ③ Not suitable for bedridden patients. Most of the current devices are bulky, have many protruding structures, or are restricted by placement posture, and are not suitable for bedridden environments and patients. Summary of the invention

[0010] The technical problem to be solved by the present invention is: for patients with ankle joint dysfunction, how to ensure that the passive movement of the ankle joint can satisfy the physiological angle of internal and external rotation of the patient's lower limbs.

[0011] In order to solve the above technical problems, the technical solution of the present invention is to provide a rehabilitation device for passive movement of the ankle joint, characterized in that it includes a base, a rotatable calf fixing plate is provided on the base, a first strap for binding the calf is provided at one end of the calf fixing plate, the other end of the calf fixing plate is rotatably connected to one end of a telescopic rod, a ball head is provided at the other end of the telescopic rod, the ball head is movably connected to the ball joint of a foot fixer, the ball joint is fixed at the bottom of the sole fixing plate, the sole fixing plate is connected to one end of a sole support plate, a second strap for binding the sole of the foot is provided on the sole fixing plate, and a third strap for binding the heel is connected to the second strap or the sole fixing plate.

[0012] Preferably, the bottom of the base is a plane and the top is an arc-shaped groove, in which a calf fixing plate that can rotate along the inner wall of the arc-shaped groove is provided, and the shapes of the upper and lower sides of one end of the calf fixing plate match the shape of the arc-shaped groove on the top of the base.

[0013] Preferably, at least two guide grooves perpendicular to the central axis of the arc groove are opened on the inner wall of the arc groove, and a plurality of sliders are provided on the outer wall of one end of the calf fixing plate, all the sliders are correspondingly arranged in each guide groove, and the sliders are slidably arranged in their corresponding guide grooves, so that the calf fixing plate rotates along the circumferential surface of the arc groove of the base.

[0014] Preferably, the guide groove matches the shape of the slider, and the slider is inserted into the guide groove from one side of the base; the calf fixing plate cannot be directly separated from the base upward, and the slider can only slide out from the end of the guide groove along the guidance of the guide groove.

[0015] Preferably, one side of one end of the calf fixing plate is fixedly connected to one end of at least two first straps, and the other end of the first strap passes through the through hole on the other side of one end of the calf fixing plate, is bent reversely and connected to the first strap itself through Velcro; one side of the sole fixing plate is connected to one end of the second strap, and the other side of the sole fixing plate is provided with a through hole, and the other end of the second strap passes through the through hole, is bent reversely and connected to the second strap itself through Velcro.

[0016] Preferably, one side of the rear end of the second strap is connected to one end of the third strap, and the other end of the third strap is connected to the other side of the rear end of the second strap via Velcro; or, the structure of the second strap connected to the sole fixing plate is the same as the structure of the third strap connected to the sole fixing plate.

[0017] Preferably, two rotating seats are provided at the end position of the other end of the calf fixing plate, the rotating seat is rotatably connected to the rotating shaft at one end of the telescopic rod, and the two ends of the rotating shaft are respectively inserted into the holes of the two rotating seats; the other end of the sole support plate is fixed with a heel limit seat with a circular arc rear end.

[0018] Preferably, a limiting guide hole is provided in the middle of the sole fixing plate, one end of the sole supporting plate is slidably arranged in the limiting guide hole, and a positioning key is fixed on one side of the sole fixing plate to fix the position of the sole supporting plate.

[0019] Preferably, the positioning key is a rotatable handle, one end of the handle is a bolt, one end of the bolt passes through one side of the sole fixing plate and presses against one side of the sole supporting plate, thereby fastening the sole supporting plate.

[0020] Preferably, a heel movable groove is provided at the other end of the calf fixing plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. It can adapt to the internal and external rotation angles of the patient's lower limbs. That is, the present invention rotates the calf fixing plate used to fix the calf on the base, allowing the calf structure part and the base part to freely rotate internally and externally, and can adapt to the internal and external rotation angles of the patient's lower limbs.

[0023] 2. No preset rotation axis. That is, the present invention does not design a structure that restricts movement around the ankle joint, and allows the ankle joint to freely dorsiflex and plantar flex through the extension and retraction of the ball head and the ball joint and the telescopic rod.

[0024] 3. The structure of the present invention is small in size and its structural features are suitable for mattress environments and are not prone to getting stuck or tangled. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a rehabilitation device for passive ankle motion;

[0026] Figure 2 An exploded view of a rehabilitation device for passive ankle motion;

[0027] Figure 3 A schematic diagram of wearing a rehabilitation device for passive ankle motion. DETAILED DESCRIPTION

[0028] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0029] The present invention provides a rehabilitation device for passive ankle movement, such as Figure 1 , Figure 2As shown, it includes a base 1, the bottom of the base 1 is a plane, the top is an arc groove similar to a semi-cylindrical shape, the inner wall of the arc groove is provided with at least two guide grooves 1.1 perpendicular to the central axis of the arc groove, and a calf fixing plate 2 that can rotate along the inner wall of the arc groove is provided in the arc groove, and the shapes of the upper and lower sides of one end of the calf fixing plate 2 match the shape of the arc groove at the top of the base 1. A plurality of sliders 2.4 are provided on the outer wall of one end of the calf fixing plate 2, all of which are correspondingly arranged in each guide groove 1.1, and the sliders 2.4 can slide in their corresponding guide grooves 1.1, so that the calf fixing plate 2 rotates along the circumferential surface of the arc groove of the base 1, the shapes of the guide groove 1.1 and the sliders 2.4 match, and the sliders 2.4 are inserted into the guide groove 1.1 from one side of the base 1. The calf fixing plate 2 cannot be directly separated from the base 1 upwards, and the sliders 2.4 can only slide out from the end of the guide groove 1.1 along the guidance of the guide groove 1.1. One side of one end of the calf fixing plate 2 is fixedly connected to one end of at least two first straps 2.1, and the other end of the first strap 2.1 passes through the through hole on the other side of one end of the calf fixing plate 2, is bent in the opposite direction, and then connected to the first strap 2.1 itself through Velcro. The other end of the calf fixing plate 2 is in the shape of a flat plate, and a rotating seat 2.3 is provided at the end position of the other end of the calf fixing plate 2, and the rotating seat 2.3 is rotatably connected to the rotating shaft 3.1 at one end of the telescopic rod 3. In this embodiment, the two ends of the rotating shaft 3.1 are respectively inserted into the holes of the two rotating seats 2.3. A ball head 3.2 is provided at the other end of the telescopic rod 3, and the ball head 3.2 is connected to the ball joint 4.1 of the foot fixer 4. The ball head 3.2 can rotate in any direction in the ball joint 4.1, and the ball joint 4.1 is fixed to the bottom of the sole fixing plate 4.2. A limiting guide hole 4.7 is provided in the middle of the sole fixing plate 4.2. One end of the sole supporting plate 4.6 is slidably arranged in the limiting guide hole 4.7, and the other end is fixed with a heel limiting seat 4.5 with a circular arc at the rear end to prevent the heel from falling out backwards. A positioning key 4.4 is fixed on one side of the sole fixing plate 4.2, and the position of the sole supporting plate 4.6 is fixed by the positioning key 4.4. In this embodiment, the positioning key 4.4 is a rotatable handle, and one end of the handle is a bolt. One end of the bolt passes through one side of the sole fixing plate 4.2 and presses against one side of the sole supporting plate 4.6, thereby tightening the sole supporting plate 4.6. If the handle is rotated so that the end of the bolt pressing against the sole supporting plate 4.6 is loosened, the sole supporting plate 4.6 can be made to slide in the limiting guide hole 4.7, thereby adjusting the position of the sole supporting plate 4.6 to suit patients with different foot sizes.One side of the sole fixing plate 4.2 is connected to one end of the second strap 4.3, and the other side of the sole fixing plate 4.2 is provided with a perforation. The other end of the second strap 4.3 passes through the perforation and is bent in the reverse direction and connected to the second strap 4.3 itself through Velcro. One side of the rear end of the second strap 4.3 is connected to one end of the third strap 4.8, and the other end of the third strap 4.8 is connected to the other side of the rear end of the second strap 4.3 through Velcro (or, the structure of the second strap 4.3 connecting the sole fixing plate 4.2 is the same as the structure of the third strap 4.8 connecting the sole fixing plate 4.2). The third strap 4.8 is used to tie the second strap 4.3 and the heel of the human body tightly, which is equivalent to the heel strap of a sandal. The entire foot fixer 4 is equivalent to a shoe, and the sole support plate 4.6 acts as a sole. In this embodiment, the telescopic rod 3 is a reciprocating hydraulic push-pull rod. The sole support plate 4.6 is provided with a plurality of ventilation holes to allow the sole of the patient to ventilate. In this embodiment, the sole support plate 4.6 is a long and narrow strip structure.

[0030] The other end of the calf fixing plate 2 is provided with a heel movable groove 2.2 to suit the position of the lower limbs of the human body, that is, when the calf is attached to the upper surface of the calf fixing plate 2, the heel limit seat 4.5 is located in the heel movable groove 2.2 and moves up and down to prevent the calf fixing plate 2 from interfering with the heel limit seat 4.5.

[0031] like Figure 3 As shown, the use process of the present invention is as follows:

[0032] Untie the other end of the first strap 2.1, the other end of the second strap 4.3, and the other end of the third strap 4.8, put the patient's calf into the arc-shaped structure at one end of the calf fixing plate 2, and place the sole of the foot on the sole fixing plate 4.2 and the sole supporting plate 4.6, with the rear part of the heel lower than the front end of the heel limit seat 4.5, and then pass the other end of the second strap 4.3 through the perforation at the other end of the sole fixing plate 4.2 and connect it to the second strap 4.3 itself through Velcro, pass the other end of the third strap 4.8 around the heel and connect it to the second strap 4.3 through Velcro, and after the other end of the first strap 2.1 passes around the calf, pass through the perforation on the calf fixing plate 2, and connect it to the first strap 2.1 itself through Velcro.

[0033] If the distance between the sole fixing plate 4.2 and the heel limit seat 4.5 is felt to be too long, the positioning key 4.4 can be loosened, and then the sole supporting plate 4.6 can be slid into the limit guide hole 4.7 of the sole fixing plate 4.2 to shorten the distance between the sole fixing plate 4.2 and the heel limit seat 4.5, and finally the positioning key 4.4 can be tightened.

[0034] When the patient uses the present invention for rehabilitation exercise, the ball head 3.2 and the ball joint 4.1 and the telescopic rod 3 can be extended and retracted to achieve rotation in any direction, thereby achieving left and right up and down movement of the ankle. The calf fixing plate 2 rotates on the base 1 to achieve rotation of the calf internal and external rotation angles.

Claims

1. A rehabilitation device for passive ankle movement, characterized in that: The invention comprises a base (1), wherein a rotatable calf fixing plate (2) is provided on the base (1), a first strap (2.1) for tying the calf is provided at one end of the calf fixing plate (2), the other end of the calf fixing plate (2) is rotatably connected to one end of a telescopic rod (3), the other end of the telescopic rod (3) is provided with a ball head (3.2), the ball head (3.2) is movably connected to a ball joint (4.1) of a foot fixer (4), the ball joint (4.1) is fixed to the bottom of the sole fixing plate (4.2), the sole fixing plate (4.2) is connected to one end of a sole supporting plate (4.6), the sole fixing plate (4.2) is provided with a second strap (4.3) for tying the sole, and the second strap (4.3) or the sole fixing plate (4.2) is connected to a third strap (4.8) for tying the heel.

2. A rehabilitation device for passive ankle motion according to claim 1, characterized in that: The base (1) has a flat bottom and an arc-shaped groove at the top. A calf fixing plate (2) is arranged in the arc-shaped groove and can rotate along the inner wall of the arc-shaped groove. The shapes of the upper and lower sides of one end of the calf fixing plate (2) match the shape of the arc-shaped groove at the top of the base (1).

3. A rehabilitation device for passive ankle motion according to claim 2, characterized in that: At least two guide grooves (1.1) perpendicular to the central axis of the arc groove are formed on the inner wall of the arc groove, and a plurality of sliders (2.4) are provided on the outer wall of one end of the calf fixing plate (2), and all the sliders (2.4) are correspondingly arranged in each guide groove (1.1), and the sliders (2.4) are slidably arranged in their corresponding guide grooves (1.1), so that the calf fixing plate (2) rotates along the circumferential surface of the arc groove of the base (1).

4. A rehabilitation device for passive ankle motion according to claim 3, characterized in that: The guide groove (1.1) matches the shape of the slider (2.4), and the slider (2.4) is inserted into the guide groove (1.1) from one side of the base (1); the calf fixing plate (2) cannot be directly separated from the base (1) upwards, and the slider (2.4) can only slide out from the end of the guide groove (1.1) along the guidance of the guide groove (1.1).

5. A rehabilitation device for passive ankle motion according to claim 1, characterized in that: One side of one end of the calf fixing plate (2) is fixedly connected to one end of at least two first straps (2.1); the other end of the first strap (2.1) passes through a through hole on the other side of one end of the calf fixing plate (2), is reversely bent, and is connected to the first strap (2.1) itself through Velcro; one side of the sole fixing plate (4.2) is connected to one end of the second strap (4.3); the other side of the sole fixing plate (4.2) is provided with a through hole; the other end of the second strap (4.3) passes through the through hole, is reversely bent, and is connected to the second strap (4.3) itself through Velcro.

6. A rehabilitation device for passive ankle motion according to claim 5, characterized in that: One side of the rear end of the second strap (4.3) is connected to one end of the third strap (4.8), and the other end of the third strap (4.8) is connected to the other side of the rear end of the second strap (4.3) via Velcro; or, the structure of the second strap (4.3) connected to the sole fixing plate (4.2) is the same as the structure of the third strap (4.8) connected to the sole fixing plate (4.2).

7. A rehabilitation device for passive ankle motion according to claim 1, characterized in that: Two rotating seats (2.3) are provided at the end of the other end of the calf fixing plate (2), the rotating seat (2.3) is rotatably connected to a rotating shaft (3.1) at one end of the telescopic rod (3), and the two ends of the rotating shaft (3.1) are respectively inserted into the holes of the two rotating seats (2.3); the other end of the sole supporting plate (4.6) is fixed with a heel limiting seat (4.5) with a circular arc rear end.

8. A rehabilitation device for passive ankle motion according to claim 1, characterized in that: A limiting guide hole (4.7) is provided in the middle of the sole fixing plate (4.2), one end of the sole supporting plate (4.6) is slidably arranged in the limiting guide hole (4.7), and a positioning key (4.4) is fixed on one side of the sole fixing plate (4.2), and the position of the sole supporting plate (4.6) is fixed by the positioning key (4.4).

9. A rehabilitation device for passive ankle motion according to claim 8, characterized in that: The positioning key (4.4) is a rotatable handle, one end of which is a bolt, one end of which passes through one side of the sole fixing plate (4.2) and presses against one side of the sole supporting plate (4.6), thereby fastening the sole supporting plate (4.6).

10. The rehabilitation device for passive ankle motion according to claim 1, characterized in that: The other end of the calf fixing plate (2) is provided with a heel movable groove (2.2).

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