Joint limiting device

Abstract

This utility model belongs to the field of joint limiting technology, and in particular relates to a joint limiting device. It includes two fixed rings connected by a telescopic rod of adjustable length. The telescopic rod includes a sleeve, within which a movable rod is independently mounted. A freely rotatable cam is provided on the outer wall of the sleeve, and a buckle is fixed to the cam. A through groove corresponding to the cam is formed on the sleeve, communicating internally and externally. A spring plate is fixed to the sleeve, and a locking block is fixed to the movable end of the spring plate, located within the through groove. Several locking grooves are formed on the side wall of the movable rod, distributed along its length, for locking the locking block. The protruding end of the cam abuts against the locking block, locking the block within the locking groove. This utility model allows the two fixed rings to be worn on the patient's thigh and calf respectively, and then the buckle is engaged to lock the telescopic length of the sleeve and the movable rod, thus conveniently and quickly limiting the joint angles of different patients or the same patient at different stages of rehabilitation.

Description

Technical Field

[0001] This utility model belongs to the field of joint limiting technology, and in particular relates to a joint limiting device. Background Technology

[0002] In orthopedic clinical nursing, the rehabilitation process for patients with joint injuries requires precise control of the joint's range of motion to avoid secondary injury and promote tissue repair. Traditional joint limiting devices mainly use rigid structures such as plaster casts or metal braces. While these devices can provide stable support, they suffer from problems such as inconvenient adjustment and poor comfort, making it difficult to meet the needs of progressive adjustments to joint range of motion at different stages of rehabilitation.

[0003] Existing joint limiting devices typically employ mechanical limiting structures, restricting the range of motion of the joint through physical obstruction. While some angle-adjustable limiters can be adjusted to meet the needs of different patients or different stages of rehabilitation for the same patient, existing rotary joint limiting devices (such as spiral groove type) and threaded bushing type limiters, although capable of angle adjustment, all require manual adjustment of multiple components, making the operation cumbersome and inconvenient for restricting the patient's joint movement. Utility Model Content

[0004] The purpose of this invention is to provide a joint limiting device that can conveniently and quickly limit the joints of different patients or the same patient at different stages of rehabilitation.

[0005] The joint limiting device includes two fixing rings for fixing to a human limb, and an adjustable telescopic rod connected between the two fixing rings. The two ends of the telescopic rod are respectively hinged to the two fixing rings. The telescopic rod includes a sleeve, and a movable rod that can move along its length is independently installed inside the sleeve. The movable end of the movable rod is hinged to one of the fixing rings, and the tail end of the sleeve is hinged to the other fixing ring. A freely rotatable cam is provided on the outer wall of the sleeve. A plate buckle is fixed on the cam. A through groove with internal and external communication is opened on the sleeve corresponding to the cam. A spring plate is fixed on the sleeve. A locking block is fixed to the movable end of the spring plate. The locking block is located in the through groove. Several locking grooves distributed along its length and used for locking the locking block are opened on the side wall of the movable rod. The protruding end of the cam abuts against the locking block, and the locking block is locked in the locking groove.

[0006] Furthermore, when the plate is in the sleeve state, the protrusion of the cam abuts against the locking block.

[0007] Furthermore, the fixing ring has a "C" shaped structure, and the opening of the fixing ring is provided with straps for connecting its two ends.

[0008] Furthermore, both ends of the fixing ring are connected to connecting rings, one end of the strap is connected to one of the connecting rings, and the other end of the strap is wrapped around the other connecting ring and connected by Velcro.

[0009] Furthermore, both the sleeve and the movable rod have rectangular cross-sections.

[0010] Furthermore, the retaining ring is made of an elastic material.

[0011] Furthermore, a hinge seat is fixed on the outer wall of the fixed ring, and hinge slots for hinged engagement with the hinge seat are provided at the tail end of the sleeve and the movable end of the movable rod; the hinge seat and the groove wall of the hinge slot are pivotally hinged together.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention involves wearing two fixing rings on the patient's thigh and calf respectively, and then fastening the plate buckle to lock the extension and retraction length of the sleeve and the movable rod, thereby conveniently and quickly limiting the joint angles of different patients or different stages of rehabilitation of the same patient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 This is a three-dimensional structural diagram of the present invention; Figure 4 This is a diagram showing the usage state of this utility model; The components in the diagram are named as follows: 1. Fixed ring; 2. Hinge seat; 3. Sleeve; 4. Movable rod; 5. Strap; 6. Connecting ring; 7. Plate buckle; 8. Locking block; 9. Cam; 10. Velcro. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Example

[0015] The joint limiting device described in this embodiment, such as Figures 1 to 4As shown, it includes two fixing rings 1 for fixing to human limbs. The fixing ring 1 is made of elastic plastic material and has a "C" shaped structure. The opening of the fixing ring 1 is provided with a strap 5 for connecting its two ends. Both ends of the fixing ring 1 are connected to connecting rings 6. One end of the strap 5 is connected to one of the connecting rings 6, and the other end is wrapped around the other connecting ring 6 and connected by Velcro 10.

[0016] During use, the elastic fixing ring 1 can adapt to patients with different leg sizes to a certain extent. Two fixing rings 1 are distributed and fixed on the patient's thigh and calf. After the fixing ring 1 is put on the leg, the two ends of the fixing ring 1 are tightened by the strap 5. The connecting end of the strap 5 passes around the connecting ring 6 at the other end and is fixed by Velcro 10. The hook side of the Velcro 10 is connected to the connecting end of the strap 5, and its rough side is connected to the outer side of the middle of the strap 5. The length of the rough side needs to be sufficient for the hook side to be attached in different positions.

[0017] like Figure 1 and Figure 2 As shown, an adjustable telescopic rod is connected between two fixed rings 1. The two ends of the telescopic rod are respectively hinged to the two fixed rings 1. The telescopic rod includes a sleeve 3, and a movable rod 4 that can move along its length is independently installed inside the sleeve 3. The movable end of the movable rod 4 is hinged to one of the fixed rings 1, and the tail end of the sleeve 3 is hinged to the other fixed ring 1. A freely rotatable cam 9 is provided on the outer wall of the sleeve 3. A plate buckle 7 is fixed on the cam 9. A through groove with internal and external communication is opened on the sleeve 3 corresponding to the cam 9. A spring plate is fixed on the sleeve 3. A locking block 8 is fixed to the movable end of the spring plate. The locking block 8 is located in the through groove. Several locking grooves distributed along its length and used for locking the locking block 8 are opened on the side wall of the movable rod 4. The protruding end of the cam 9 abuts against the locking block 8, and the locking block 8 is locked in the locking groove.

[0018] When in use, with the plate buckle 7 in contact with the sleeve 3, the protrusion of the cam 9 abuts against the locking block 8. The locking block 8 is pushed into the locking groove by the protrusion of the cam 9, thereby restricting the extension and retraction of the movable rod 4.

[0019] Both the sleeve 3 and the movable rod 4 have rectangular cross-sections, which makes the structure more stable. Connecting blocks are fixed on the outer side wall of the sleeve 3 on the front and rear sides of the corresponding through groove. A through hole with front and rear communication is opened at the center of the cam 9. A rotating shaft is independently installed in the through hole. The front and rear ends of the rotating shaft are respectively connected to the two connecting blocks. When in use, the swing plate buckle 7 can make the cam 9 rotate.

[0020] In use, the latch 7 is engaged, causing the cam 9 to rotate. Its protrusion releases its pressure on the locking block 8. With the locking block 8 no longer restrained, it disengages from the locking groove under the elastic force of the spring plate, thus releasing the locking of the movable rod 4. At this point, the movable rod 4 moves to accommodate a certain degree of extension and contraction of the patient's knee joint. When joint movement needs to be restricted, the latch 7 is engaged and rotated to fit against the sleeve 3, preventing it from protruding outside the sleeve 3 and causing accidental activation and swinging. When the latch 7 is rotated to fit against the sleeve 3, the protrusion of the cam 9 presses against the locking block 8, causing it to sink into the locking groove and lock the movement of the movable rod 4.

[0021] The included angle between the plate buckle 7 and the maximum diameter line of the cam 9 is set to 91° to 95°, for example, 93°. When the protrusion of the cam 9 abuts against the locking block 8, the plate buckle 7 is pressed against the sleeve 3. At this time, the reaction force transmitted by the spring plate to the cam 9 will cause the cam 9 to have a tendency to rotate counterclockwise. This tendency will cause the plate buckle 7 to rotate counterclockwise. However, the counterclockwise rotation of the plate buckle 7 will make it press tightly against the sleeve 3. Therefore, the spring plate also has the force to press the plate buckle 7 tightly against the sleeve 3, preventing the plate buckle 7 from shaking randomly.

[0022] like Figure 1 and Figure 3 As shown, a hinge seat 2 is fixed on the outer wall of the fixed ring 1. The tail end of the sleeve 3 and the movable end of the movable rod 4 are both provided with hinge slots for hinged connection with the hinge seat 2. The hinge seat 2 and the wall of the hinge slot are hinged together by a pivot. A hinge hole is provided on the hinge seat 2, and a pivot is independently inserted into the hinge hole, with its two ends fixed to the wall of the hinge slot, thereby enabling the movable rod 4 and the sleeve 3 to swing.

[0023] In actual use, as different patients or the same patient at different stages of rehabilitation are treated, after the two fixing rings 1 are worn on the patient's thigh and calf respectively, it is only necessary to adjust the extension length of the movable rod 4 and fasten the plate buckle 7 so that the cam 9 pushes the locking block 8 to lock in the locking groove, thereby locking the movement of the movable rod 4. This allows for convenient and quick restriction of different patients or the same patient at different stages of rehabilitation due to different joint angles.

[0024] The specific principle can be referenced from the stable structure of a triangle. When the length of one side of the triangle remains unchanged, the angle of its inner triangle will not change. The three sides of the triangle refer to the patient's thigh, lower leg, and the telescopic rod composed of cannula 3 and movable rod 4. When the length of the telescopic rod is locked, the joint between the thigh and lower leg is restricted.

Claims

1. A joint limiting device, comprising two fixing rings (1) for fixing to a human limb, wherein an adjustable telescopic rod is connected between the two fixing rings (1), and the two ends of the telescopic rod are respectively hinged to the two fixing rings (1), characterized in that: The telescopic rod includes a sleeve (3), and a movable rod (4) that can move along its length is independently installed inside the sleeve (3); the movable end of the movable rod (4) is hinged to one of the fixed rings (1), and the tail end of the sleeve (3) is hinged to the other fixed ring (1); a rotatable cam (9) is provided on the outer wall of the sleeve (3), a plate buckle (7) is fixed on the cam (9), and a through groove with internal and external communication is opened on the sleeve (3) corresponding to the cam (9); a spring plate is fixed on the sleeve (3), and a locking block (8) is fixed on the movable end of the spring plate; the locking block (8) is located in the through groove; a number of locking grooves distributed along its length and used for locking the locking block (8) are opened on the side wall of the movable rod (4); the protruding end of the cam (9) abuts against the locking block (8), and the locking block (8) is locked in the locking groove.

2. The joint limiting device according to claim 1, characterized in that: When the plate buckle (7) is in the state of being attached to the sleeve (3), the protrusion of the cam (9) rests against the locking block (8).

3. The joint limiting device according to claim 1, characterized in that: The fixing ring (1) has a "C" shaped structure, and the opening of the fixing ring (1) is provided with a strap (5) for connecting its two ends.

4. The joint limiting device according to claim 3, characterized in that: Both ends of the fixing ring (1) are connected to connecting rings (6). One end of the strap (5) is connected to one of the connecting rings (6), and the other end of the strap goes around the other connecting ring (6) and is connected by Velcro (10).

5. The joint limiting device according to claim 1, characterized in that: The cross-sections of both the sleeve (3) and the movable rod (4) are rectangular.

6. The joint limiting device according to claim 1, characterized in that: The fixing ring (1) is made of elastic material.

7. The joint limiting device according to claim 1, characterized in that: A hinge seat (2) is fixed on the outer wall of the fixed ring (1). The tail end of the sleeve (3) and the movable end of the movable rod (4) are both provided with hinge grooves for hinged to the hinge seat (2). The hinge seat (2) and the groove wall of the hinge groove are hinged by a pivot.

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