Four-connecting-rod hydraulic knee joint

Abstract

The utility model discloses a four-connecting-rod hydraulic knee joint, which relates to the technical field of artificial limb knee joints, and comprises a fixed frame and a protective frame, the protective frame is fixedly connected to the top of the fixed frame, and the top of the protective frame is fixedly connected with a hollow block. The limiting frame, the threaded rod, the transmission gear, the connecting gear, the rack, the sliding rod, the connecting rod and other assemblies are driven to be matched with one another through the rotating force of the fixing shaft, the grab handle fixed to the circumferential face of the fixing shaft is rotated, and therefore the grab handle is driven to rotate, and meanwhile the transmission gear fixed to the circumferential face of the fixing shaft is driven to rotate; the transmission gear enables the connecting gears meshed with each other to be stressed and drives the threaded rod in threaded connection with the interior of the threaded hole to rotate at the same time, when the threaded rod rotates, the limiting frames deform and get close to each other, and when the patient uses the artificial limb knee joint, the legs of the patient are limited and prevented from shaking, so that the experience feeling of the patient is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of artificial knee joint, especially relates to a four-bar linkage hydraulic knee joint. BACKGROUND

[0002] The four-bar linkage hydraulic knee joint is a type of joint used in artificial limb design and mechanical systems, commonly applied in biomechanics and medical engineering fields, and its principle is based on the combination of four-bar linkage mechanism and hydraulic control system, aiming to simulate the natural movement of human knee joint and provide better flexibility and stability.

[0003] According to the four-bar linkage hydraulic artificial knee joint (publication number: CN209564265U), the knee joint comprises an upper joint body, a lower joint body, two first connecting rods, two second connecting rods, a hydraulic cylinder and four connecting shafts; the upper joint body is fixedly inserted with the first connecting shaft on both sides, the rear end of the upper joint body is fixedly inserted with the second connecting shaft, the bottom of the lower joint body is fixedly inserted with the third connecting shaft, the top of the lower joint body is fixedly inserted with the fourth connecting shaft, the first connecting shaft is movably connected with one end of the two first connecting rods, and the other end of the two first connecting rods is movably connected with the two ends of the third connecting shaft.

[0004] However, in the above design, when the patient uses the artificial knee joint, it is easy to shake, which affects the experience of the patient, and therefore a four-bar linkage hydraulic knee joint needs to be invented. UTILITY MODEL CONTENTS

[0005] The utility model discloses a four-bar linkage hydraulic knee joint, which is driven by the rotating force of the fixed shaft, and the components such as the limiting frame, the threaded rod, the transmission gear, the connecting gear, the rack, the sliding rod and the connecting rod are cooperated with each other to realize the rotation of the handle fixed on the circumference of the fixed shaft, thereby driving the handle to rotate, and the transmission gear fixed on the circumference of the fixed shaft is also driven to rotate, the transmission gear makes the connecting gears meshed with each other bear the force, and the threaded rod screwed in the threaded hole is also driven to rotate, thereby solving the existing problems.

[0006] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0007] The utility model discloses a four connecting rod hydraulic knee joint, including fixed frame and guard frame, the guard frame fixed connection is in the top of fixed frame, the top fixed connection of guard frame has hollow block, the inside wall rotation of hollow block is connected with the pivot, the circumference of pivot is fixedly connected with thigh guard board, the top of fixed frame is fixedly connected with shank guard board, the top of shank guard board is provided with hydraulic assembly, the inside of guard frame is provided with steady mechanism, the steady mechanism includes limit stop, the inner wall of guard frame is fixedly connected with limit stop, the circumference of limit stop is equipped with screw hole, the inner wall screw of screw hole is connected with threaded rod, the circumference of threaded rod is fixedly connected with connecting gear, the side of guard frame is equipped with the sliding slot, the inside wall sliding of sliding slot is connected with sliding block, the side fixed connection of sliding block has connecting rod, the one end fixed connection of connecting rod away from sliding block has rack, the side rotation of guard frame is connected with fixed shaft, the circumference of fixed shaft is fixedly connected with transmission gear.

[0008] Further, the outer surface of the hydraulic assembly is provided with a rear leg protection plate, and the circumference of the fixed shaft is fixedly connected with a handle. The handle is designed to facilitate the patient to drive the transmission gear to rotate.

[0009] Further, the transmission gear and the connecting gear are in mesh with each other, the connecting gear and the rack are in mesh with each other, the screw hole is provided with two, and is arranged on the circumference of the limit stop, and the limit stop is provided with two and is fixedly connected to the inner wall of the guard frame. The above design is beneficial to the limiting of the limit stop according to the leg of the patient.

[0010] Further, the front side of the rear leg protection plate is provided with a protection mechanism, and the protection mechanism comprises a protection pad.

[0011] Further, the side of the rear leg protection plate is fixedly connected with a connecting block, the side of the connecting block is provided with a rectangular groove, the inner wall of the rectangular groove is slidably connected with a limiting plate, and the above design is beneficial to the replacement of the protection pad by the patient.

[0012] Further, the limiting plate and the protection pad are in contact with each other, the protection pad is in contact with the front side of the rear leg protection plate, and the above design is beneficial to the protection of the leg of the patient.

[0013] Further, the connecting gear is provided with two, and is vertically symmetrical along the side vertical central axis of the guard frame, and the side section of the connecting rod is provided with an L shape, and the above design is beneficial to the further protection of the leg and is more stable.

[0014] The utility model has the following beneficial effects:

[0015] The utility model discloses a rotating force of fixed axle drives the mutual cooperation of limiting frame, threaded rod, transmission gear, connecting gear, rack, sliding rod, connecting rod and other components, realizes the handle fixed on the circumference of fixed axle rotation, to drive handle rotation, simultaneously drive transmission gear fixed on the circumference of fixed axle rotation, and transmission gear makes the force of mutual meshing connecting gear, simultaneously drive threaded rod rotation in the threaded hole, when threaded rod rotates and makes limiting frame deformation, makes limiting frame close to each other, when the patient uses artificial knee joint, the leg of patient is positioned to prevent from shaking, thereby improved the experience of patient.

[0016] The utility model discloses the sliding force of limiting board drives the mutual cooperation of protective pad, connecting block, rectangular groove and other components, realizes when protective pad is damaged, and staff pulls the limiting board sliding in the inner wall of rectangular groove and moves, makes limiting board no longer with protective pad contact, when protective pad is damaged, and it is convenient for staff to replace.

[0017] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be needed to use the drawing of the embodiment to introduce briefly, and obviously, the drawing in the following description only is some embodiments of the utility model, and for the ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0019] Figure 1 It is three-dimensional appearance schematic diagram of the utility model;

[0020] Figure 2 It is three-dimensional schematic diagram of handle of the utility model;

[0021] Figure 3 It is three-dimensional schematic diagram of limiting frame of the utility model;

[0022] Figure 4 It is three-dimensional display schematic diagram of protective pad of the utility model;

[0023] Figure 5 It is three-dimensional display schematic diagram of limiting board of the utility model.

[0024] In the drawings, the component list represented by each sign is as follows:

[0025] 1, fixed frame; 2, guard frame; 3, hollow block; 4, rotating shaft; 5, thigh guard plate; 6, calf guard plate; 7, hydraulic assembly; 8, rear leg guard plate; 9, stabilizing mechanism; 91, limiting frame; 92, threaded hole; 93, threaded rod; 94, fixed shaft; 95, transmission gear; 96, connecting gear; 97, rack; 98, sliding groove; 99, sliding block; 910, connecting rod; 911, handle; 10, protection mechanism; 101, protection pad; 102, connecting block; 103, rectangular groove; 104, limiting plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Please refer to Figures 1-5 The utility model discloses a four-bar linkage hydraulic knee joint, including fixed frame 1 and guard frame 2, guard frame 2 fixedly connected at the top of fixed frame 1, the top of guard frame 2 is fixedly connected with hollow block 3, the inner side wall of hollow block 3 is rotatably connected with rotating shaft 4, the circumferential surface of rotating shaft 4 is fixedly connected with thigh guard plate 5, the top of fixed frame 1 is fixedly connected with calf guard plate 6, and the top of calf guard plate 6 is provided with hydraulic assembly 7. The inside of guard frame 2 is provided with stabilizing mechanism 9, and the stabilizing mechanism 9 comprises limiting frame 91. The limiting frame 91 is fixedly connected to the inner wall of the guard frame 2. Threaded holes 92 are formed in the circumferential surface of the limiting frame 91. Threaded rods 93 are threadedly connected to the inner wall of the threaded holes 92. Connecting gears 96 are fixedly connected to the circumferential surface of the threaded rods 93. Sliding grooves 98 are formed in the side surface of the guard frame 2. Sliding blocks 99 are slidably connected to the inner side wall of the sliding grooves 98. Connecting rods 910 are fixedly connected to the side surface of the sliding blocks 99. Racks 97 are fixedly connected to the end of the connecting rods 910 away from the sliding blocks 99. Fixed shafts 94 are rotatably connected to the side surface of the guard frame 2. Transmission gears 95 are fixedly connected to the circumferential surface of the fixed shafts 94.

[0028] The outer surface of the hydraulic assembly 7 is provided with a rear leg guard plate 8. The circumferential surface of the fixed shaft 94 is fixedly connected with a handle 911. The design of the handle 911 is conducive to facilitating the patient to drive the transmission gear 95 to rotate.

[0029] The transmission gear 95 and the connecting gear 96 are meshed with each other. The connecting gear 96 and the rack 97 are meshed with each other. The threaded holes 92 are provided with two, which are formed in the circumferential surface of the limiting frame 91. The limiting frame 91 is provided with two, which are fixedly connected to the inner wall of the guard frame 2. The above design is conducive to limiting the limiting frame 91 according to the patient's leg.

[0030] The front side of the back leg protection plate 8 is provided with a protection mechanism 10, which comprises a protection pad 101 arranged on the front side of the back leg protection plate 8.

[0031] The side of the back leg protection plate 8 is fixedly connected with a connecting block 102, the side of the connecting block 102 is provided with a rectangular groove 103, and the inner wall of the rectangular groove 103 is slidably connected with a limiting plate 104. The above design is helpful for the patient to replace the protection pad 101.

[0032] The limiting plate 104 is in contact with the protection pad 101, and the protection pad 101 is in contact with the front side of the back leg protection plate 8. The above design is helpful for protecting the legs of the patient.

[0033] The connecting gear 96 is provided with two, which are symmetrical to each other along the vertical central axis of the side of the protection frame 2, and the side section of the connecting rod 910 is provided with an L shape. The above design is helpful for further protecting the legs more stably.

[0034] One specific application of the embodiment is as follows: first, the patient wears the artificial knee joint, and then the leg enters the inside of the limiting frame 91. When it is necessary to adjust the clamping force of the limiting frame 91, the staff first rotates the handle 911 fixed on the circumferential surface of the fixed shaft 94, so as to drive the handle 911 to rotate, and at the same time drive the transmission gear 95 fixed on the circumferential surface of the fixed shaft 94 to rotate. The transmission gear 95 makes the connecting gear 96 in meshing with each other bear stress, and at the same time drives the threaded rod 93 screwed in the threaded hole 92 to rotate. When the threaded rod 93 rotates, the limiting frame 91 deforms, and the limiting frame 91 approaches each other, so as to clamp the legs of the patient. When the connecting gear 96 rotates, the rack 97 in meshing with each other bears stress, and at the same time makes the sliding in the inner wall of the sliding groove 98, so as to drive the connecting rod 910 fixed on the side to move. The movement of the connecting rod 910 drives the rack 97 fixed on the other end to move, and when the rack 97 drives the other connecting gear 96 in meshing to rotate, the other threaded rod 93 is driven to rotate, and at the same time the other limiting frame 91 approaches each other to clamp the legs of the patient. Finally, when the protection pad 101 is damaged, the staff pulls the limiting plate 104 sliding in the inner wall of the rectangular groove 103 to move, so that the limiting plate 104 is no longer in contact with the protection pad 101. At this time, the patient replaces the protection pad 101.

[0035] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the utility model disclosed above are only used for helping to explain the utility model. The preferred embodiments do not describe all the details exhaustively, and also do not limit the utility model to only the specific implementation manners described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited only by the claims and the entire scope and equivalents thereof.

Claims

1. A four-bar hydraulic knee joint comprising a fixed frame (1) and a protection frame (2), characterized in that: The protection frame (2) is fixedly connected at the top of the fixed frame (1), the top of the protection frame (2) is fixedly connected with a hollow block (3), the inner side wall of the hollow block (3) is rotatably connected with a rotating shaft (4), the circumferential surface of the rotating shaft (4) is fixedly connected with a thigh protection plate (5), the top of the fixed frame (1) is fixedly connected with a calf protection plate (6), the top of the calf protection plate (6) is provided with a hydraulic assembly (7), and the inside of the protection frame (2) is provided with a stabilizing mechanism (9). The stabilizing mechanism (9) comprises a limiting frame (91) fixedly connected to the inner wall of the protection frame (2), a threaded hole (92) is formed in the circumferential surface of the limiting frame (91), a threaded rod (93) is threadedly connected to the inner wall of the threaded hole (92), a connecting gear (96) is fixedly connected to the circumferential surface of the threaded rod (93), a sliding groove (98) is formed in the side of the protection frame (2), a sliding block (99) is slidably connected to the inner side wall of the sliding groove (98), a connecting rod (910) is fixedly connected to the side of the sliding block (99), and a rack (97) is fixedly connected to the end of the connecting rod (910) away from the sliding block (99). A fixed shaft (94) is rotatably connected to the side of the protection frame (2), and a transmission gear (95) is fixedly connected to the circumferential surface of the fixed shaft (94).

2. The four-bar hydraulic knee joint according to claim 1, wherein, The outer surface of the hydraulic assembly (7) is provided with a back leg protection plate (8), and the circumferential surface of the fixed shaft (94) is fixedly connected with a handle (911).

3. A four-bar hydraulic knee joint according to claim 2, wherein, The transmission gear (95) and the connecting gear (96) are in meshing connection, the connecting gear (96) and the rack (97) are in meshing connection, the threaded hole (92) is provided with two, which are formed in the circumferential surface of the limiting frame (91), and the limiting frame (91) is provided with two, which are fixedly connected to the inner wall of the protection frame (2).

4. The four-bar hydraulic knee joint of claim 3, wherein, The front side of the back leg protection plate (8) is provided with a protection mechanism (10), and the protection mechanism (10) comprises a protection pad (101) arranged on the front side of the back leg protection plate (8).

5. A four-bar hydraulic knee joint according to claim 4, wherein, The side of the back leg protection plate (8) is fixedly connected with a connecting block (102), the side of the connecting block (102) is provided with a rectangular groove (103), and the inner wall of the rectangular groove (103) is slidably connected with a limiting plate (104).

6. A four-bar hydraulic knee joint according to claim 5, wherein, The limiting plate (104) and the protection pad (101) are in contact with each other, and the protection pad (101) is in contact with the front side of the back leg protection plate (8).

7. The four-bar hydraulic knee joint of claim 1, wherein, The connecting gear (96) is provided with two, which are vertically symmetrical along the central axis of the side of the protection frame (2), and the side section of the connecting rod (910) is provided with an L-shaped.

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