CN111494063B

CN111494063B - Knee joint structure

Info

Publication number: CN111494063B
Application number: CN202010084345.5A
Authority: CN
Inventors: 郑嘉宝; 梁智炫; 吴祥铭
Original assignee: Ken Dall Enterprise Co Ltd
Current assignee: Ken Dall Enterprise Co Ltd
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2023-05-26
Anticipated expiration: 2040-02-10
Also published as: CN111494063A

Abstract

The invention relates to a knee joint structure, which comprises a knee joint head, a knee joint body and at least an arc piece, wherein the knee joint head is provided with a resetting device consisting of a piston, an elastic body and an adjusting cover, and a transmission shaft, the transmission shaft is provided with a push rod shaft, the push rod shaft is pivoted with a push rod capable of pushing the piston, the knee joint body is pivoted with the knee joint head by a connecting rod, and the arc piece is connected with the transmission shaft and the knee joint body. When the knee joint is bent, the push rod can push the elastic body to reserve elasticity, and the elastic body elastic force is used for restoring the original state when the knee joint reversely pivots; by arranging the resetting device and the push rod on the knee joint head, the critical angle of knee joint bending can be larger than the bending angle during walking, so that normal walking gait can be completed in each step, the defect that the knee joint which should be straightened originally is unexpected to continue bending and is easy to fall down and hurt due to exceeding the critical angle after the knee joint is bent in the prior art is overcome, the safety can be improved, and the strength of the elastic body can be conveniently adjusted to be matched with the walking speed of a user.

Description

Knee joint structure

Technical Field

The invention relates to a knee joint structure, in particular to a knee joint structure of a prosthetic limb user, which can improve walking safety, is convenient for adjusting joint recovery strength and saves more labor in walking.

Background

The artificial limb is mainly used for replacing the function of the disabled limb or for modifying the appearance of the disabled limb, wherein the knee joint is a design key because the knee joint is related to gait and mechanical balance during walking and must have supporting and walking functions for replacing the normal knee joint.

Referring to fig. 15 and 16, a conventional knee joint structure mainly comprises a knee joint head 91, a knee joint body 92, and a connecting rod 93 and an arc piece 94 for connecting the knee joint head 91 and the knee joint body 92, wherein the knee joint body 92 is provided with a resetting device 921, and the connecting rod 93 is provided with a bump 931, so that when the knee joint is bent, the bump 931 can push the resetting device 921 to store elastic force, and when the knee joint is pivoted reversely, the resetting device 921 can release elastic force to restore the original shape.

Referring to fig. 16 to 18, because the resetting device 921 is disposed on the knee joint body 92, the protruding block 931 is disposed on the structural configuration of the connecting rod 93, the critical angle of knee joint bending is only about 60 ° -80 ° (as shown in fig. 16) due to the axis point transformation during the knee joint movement, but the actual use condition is: when the knee joint walks in a fast walking manner, the bending angle easily exceeds the critical angle, so that the knee joint which should be restored to the straightened state is not expected to continue bending (such as the bending direction of the knee joint in fig. 17, the arrow in the figure represents the knee joint head 91 and the knee joint body 92 not to pivot towards the straightened state), and the normal walking gait cannot be completed, and the knee joint is easy to fall and be injured.

In addition, since the resetting device 921 is disposed on the knee joint body 92, the push rod 931 is disposed on the structural arrangement of the connecting rod 93, and the knee joint body 92 is used for receiving the calf prosthesis, when the strength of the elastic body is to be adjusted, the calf prosthesis must be removed first, which causes inconvenience in adjusting the strength of the elastic body.

Therefore, how to improve the deficiency of the conventional knee joint structure is urgent in the industry.

Accordingly, the present inventors have developed the present invention based on the idea of product innovation, based on practical experience of product design and development for many years, and through numerous practical tests and experiments.

Disclosure of Invention

The invention aims to provide a knee joint structure capable of improving walking safety and saving more labor in walking.

To achieve the above object, the solution of the present invention is:

a knee joint structure comprising: the knee joint head is provided with a reset hole, a piston, an elastic body and an adjusting cover are arranged in the reset hole, two ends of the elastic body respectively prop against the piston and the adjusting cover, the knee joint head is provided with a shaft hole, the shaft hole is provided with a transmission shaft, the transmission shaft is provided with a notch, the notch is provided with a push rod shaft, and the push rod shaft is pivoted with a push rod capable of pushing the piston; a knee joint body having a connecting rod, one end of the connecting rod is pivoted to the knee joint head by a first axis, and the knee joint body further has a second axis; at least one arc piece, the two ends of the arc piece are respectively connected with the transmission shaft and the second shaft center.

Further, the piston is provided with a groove, and the end part of the push rod stretches into and props against the groove.

Further, the transmission shaft is provided with a screw part in a penetrating way, and the end part of the screw part is propped against the push rod shaft to fix the push rod shaft at the notch.

Further, the following: the surface of one end of the transmission shaft is provided with a plane part to form an irregular end surface shape, the arc piece is provided with a clamping groove which is matched with the irregular end surface shape and enables one end of the transmission shaft to be clamped in the clamping groove.

Further, the adjusting cover is in threaded connection with the reset hole and is provided with an adjusting groove.

Further, the push rod shaft is penetrated through the transmission shaft and the push rod, so that the transmission shaft and the push rod are combined.

Further, the piston is pivoted to one end of the push rod by a piston shaft.

After the technical means is adopted, when the knee joint is bent, the push rod can push the elastic body to reserve elasticity, and the elastic body is used for restoring the original state when the knee joint reversely pivots; by arranging the resetting device and the push rod on the knee joint head, the critical angle of knee joint bending can be larger than the bending angle during walking, so that normal walking gait can be completed in each step, the defect that the knee joint which should be straightened originally is unexpected to continue bending and is easy to fall down and be injured due to exceeding the critical angle after the knee joint is bent in the prior art is overcome, and the safety can be improved.

In addition, the intensity adjustment position of the elastic body is improved, so that the intensity can be conveniently adjusted by matching with the walking speed of a user, and the walking is more labor-saving.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is an exploded perspective view of the present invention.

Fig. 3 is a right side view of the present invention.

Fig. 4 is a rear view of the present invention.

FIG. 5 is a cross-sectional view of the invention at A-A.

FIG. 6 is a cross-sectional view at B-B of the present invention.

Fig. 7 to 8 are sectional views of embodiments of the present invention. Wherein FIG. 7 shows a walk bending angle of about 60-80, the bending angle being less than the critical angle; figure 8 shows that the joint bending angle has been greater than 90 but still less than the critical angle.

FIG. 9 is a cross-sectional view of an embodiment of the invention for adjusting the strength of an elastomer.

Fig. 10 is an exploded view of a second construction embodiment of the present invention.

Fig. 11 is an exploded view of a third construction embodiment of the present invention.

Fig. 12 is a cross-sectional view of a third construction embodiment of the present invention.

Fig. 13 is an exploded view of a fourth construction embodiment of the present invention.

Fig. 14 is a diagram illustrating the use of the present invention in walking gait. The middle graph shows that the bending angle of the fast walking gait is smaller than the critical angle, and the right graph shows that the walking gait can return to a straightened state.

Fig. 15 to 17 are sectional views showing examples of use of the conventional technique. Wherein fig. 16 shows a walking gait curve angle of less than 90 ° but having exceeded a critical angle; figure 17 shows an abnormal posterior flexion of the knee joint.

FIG. 18 is a schematic diagram of a conventional abnormal gait. The middle graph shows that the bending angle of the rapid walking gait is larger than the critical angle, and the right graph shows that the knee joint structure is abnormally bent backwards during the walking gait.

[ symbolic description ]

Knee joint head 10 reset hole 11 piston 12

Groove 121 piston shaft 122 elastomer 13

Adjusting cover 14 adjusting groove 141 shaft hole 15

Notch 161 screw 162 of drive shaft 16

Planar portion 164 pushrod shaft 17 pushrod 18

First axis 22 of connecting rod 21 of knee joint body 20

Second axial core 23 arc piece 30 clamping groove 31

Conventional technology:

knee joint head 91 and knee joint body 92 resetting device 921

The link 93 is a tab 931 tab 94.

Description of the embodiments

The following detailed description is made with reference to the accompanying drawings, which are by way of illustration only.

Referring to fig. 1 to 6, the present invention includes a knee joint 10, a knee joint body 20, and two arc pieces 30. As will be described in detail below:

the knee joint 10 has a reset hole 11, a piston 12, an elastic body 13 and an adjusting cover 14 are disposed in the reset hole 11, two ends of the elastic body 13 respectively support against the piston 12 and the adjusting cover 14, referring to fig. 1, 5 and 14, the reset hole 11 is disposed in the front side of the knee joint 10, the adjusting cover 14 is disposed in the reset hole 11 and disposed on the front side surface of the knee joint 10, the knee joint 10 has a shaft hole 15, the shaft hole 15 is provided with a transmission shaft 16, the transmission shaft 16 has a notch 161, the notch 161 is provided with a push rod shaft 17, referring to fig. 6 to 8, the push rod shaft 17 is disposed at an eccentric position on one side of the transmission shaft 16, and the push rod shaft 17 is pivoted with a push rod 18 capable of pushing the piston 12.

Referring to fig. 7 and 8, the knee joint body 20 is pivotally connected to a connecting rod 21, one end of the connecting rod 21 is pivotally connected to the knee joint head 10 by a first axle center 22, and the knee joint body 20 further has a second axle center 23.

The two ends of the arc piece 30 are respectively connected with the transmission shaft 16 and the second shaft center 23.

In one embodiment, the piston 12 is provided with a groove 121, and the end of the push rod 18 extends into the groove 121 to form a positioning function, so that the push rod 18 can push the piston 12 within the range of the groove 121 stably and without deflection.

In one embodiment, the driving shaft 16 is threaded with a screw 162, and the end of the screw 162 is pressed against the pushrod 17 to fix the pushrod 17 to the notch 161.

In one embodiment, the end surface of the driving shaft 16 has a plane 164 to form an irregular end surface, the arc piece 30 is provided with a fastening slot 31, the fastening slot 31 is matched with the irregular end surface and enables one end of the driving shaft 16 to be fastened in the fastening slot 31, so that the arc piece 30 and the driving shaft 16 can be interlocked with each other.

The above description of the components and the composition of the invention will be presented, and the following description of the embodiments, features and benefits of the invention will be presented:

referring to fig. 7 and 8, when the knee joint of the present invention is bent, the driving shaft 16 is driven to rotate by an angle such that the push rod 18 can push the elastic body 13 via the piston 12 to store the elastic force, and the elastic body 13 is used to restore the original state when the knee joint is pivoted reversely, that is, the elastic body 13 is used to push the push rod 18 reversely to rotate the driving shaft 16 reversely and drive the arc piece 30 and the knee joint body 20 to swing reversely towards the knee joint head 10.

By providing the restoring device and the push rod 18 to the knee joint 10, the critical angle of knee joint flexion of the present invention can be set depending on the position of the push rod shaft 17 on the drive shaft 16, which is typically set to be greater than 20 ° or more of the maximum walking flexion angle. The angle of the knee joint is larger than the maximum bending angle (refer to fig. 14) during walking, so that normal walking gait can be ensured to be completed in each step, the defect that the knee joint which is originally straightened is unexpected to continue bending and is easy to fall down and be injured due to exceeding a critical angle after bending of the knee joint in the prior art is overcome, and the safety is improved.

In addition, the intensity adjustment position of the elastic body 13 is improved so as to be convenient for adjusting the intensity by matching with the walking speed of a user, and the walking is more labor-saving.

Referring to fig. 1 and 9, in an embodiment, the adjusting cover 14 is screwed to the reset hole 11 and has an adjusting slot 141, and a user can insert a hand tool into the adjusting slot 141 and rotate the adjusting cover 14 to move back and forth, so as to press or release the elastic body 13 to achieve the purpose of adjusting the elastic force.

Referring to fig. 10, in an embodiment, the push rod shaft 17 is disposed through the transmission shaft 16 and the push rod 18, so that the transmission shaft 16 and the push rod 18 are combined.

Referring to fig. 11-13, in one embodiment, the piston 12 is pivotally connected to one end of the push rod 18 by a piston shaft 122, so that the push rod 18 can stably and non-rotatably push the piston 12.

The foregoing embodiments are provided for the purpose of illustration only, and the scope of the present invention should not be limited to the embodiments described in the claims.

Claims

1. A knee joint structure, comprising:

the knee joint head is provided with a reset hole, a piston, an elastic body and an adjusting cover are arranged in the reset hole, two ends of the elastic body respectively support against the piston and the adjusting cover, the reset hole is formed in the front side of the knee joint head, the adjusting cover is arranged in the reset hole and is arranged on the front side surface of the knee joint head, the knee joint head is provided with a shaft hole, the shaft hole is provided with a transmission shaft, the transmission shaft is provided with a notch, the notch is provided with a push rod shaft, the push rod shaft is arranged at one eccentric position of the transmission shaft, and the push rod shaft is pivoted with a push rod capable of pushing the piston, so that the critical angle of the knee joint is larger than the maximum walking bending angle;

a knee joint body pivoted with a connecting rod, one end of the connecting rod is pivoted with the knee joint head by a first axle center, and the knee joint body is provided with a second axle center;

at least one arc piece, the two ends of the arc piece are respectively connected with the transmission shaft and the second shaft center.

2. The knee joint structure of claim 1, wherein: the piston is provided with a groove, and the end part of the push rod stretches into and props against the groove.

3. The knee joint structure of claim 1, wherein: the transmission shaft is provided with a screw part in a penetrating way, and the end part of the screw part is propped against the push rod shaft to fix the push rod shaft at the notch.

4. The knee joint structure of claim 1, wherein: the surface of one end of the transmission shaft is provided with a plane part to form an irregular end surface shape, the arc piece is provided with a clamping groove which is matched with the irregular end surface shape and enables one end of the transmission shaft to be clamped in the clamping groove.

5. The knee joint structure of claim 1, wherein: the adjusting cover is in threaded connection with the reset hole and is provided with an adjusting groove.

6. The knee joint structure of claim 1, wherein: the push rod shaft penetrates through the transmission shaft and the push rod, so that the transmission shaft and the push rod are combined.

7. The knee joint structure of claim 1, wherein: the piston is pivoted with one end of the push rod by a piston shaft.