CN111494063B - a knee joint - Google Patents

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

a knee joint

technical field

The present invention relates to a knee joint structure, in particular to a knee joint structure for prosthesis users that can increase walking safety, facilitate adjustment of joint recovery strength, and save walking effort.

Background technique

Prosthetic limbs mainly refer to artificial limbs, which are used to replace the functions of disabled limbs, or to modify the appearance of disabled limbs. Among them, the knee joint is the key to the design, because it is related to the gait and mechanical balance during walking and must have Replace the support and walking functions of the normal knee joint.

The conventional knee joint structure, please refer to Fig. 15 and Fig. 16, mainly includes a knee joint head 91, a knee joint body 92, and a connecting rod 93 and an arc 94 for connecting the knee joint head 91 and the knee joint body 92, Wherein the knee joint body 92 is provided with a reset device 921, and the connecting rod 93 is provided with a bump 931. With this structure, when the knee joint is bent, the bump 931 can push the reset device 921 to reserve the elastic force, and pivot in the reverse direction of the knee joint. It can be restored to its original state by the elastic force released by the reset device 921 when turning.

Please refer to Fig. 16 to Fig. 18, because the reset device 921 is arranged on the knee joint body 92, and the protrusion 931 is arranged on the structural arrangement relationship of the connecting rod 93, the critical angle of the knee joint is bent due to the transformation of the axis point during the knee joint movement. It is only about 60°~80° (as shown in Figure 16), but its actual use when walking is: when the knee joint is walking fast, the bending angle easily exceeds the critical angle, causing the knee joint that should have returned to straight Unexpected continuous bending (as shown in Figure 17, the bending direction of the knee joint, the arrow in the figure represents that the knee joint head 91 and the knee joint body 92 are not pivoting toward straightening), unable to complete normal walking gait and prone to fall and injury.

In addition, because the reset device 921 is arranged on the knee joint body 92, the push rod 931 is arranged on the structural arrangement relationship of the connecting rod 93, and the knee joint body 92 is used to accept the calf prosthesis, so that when the strength of the elastic body is to be adjusted, it must be removed first. Calf prosthetics cause inconvenience in adjusting the strength of the elastic body.

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

Yes, based on the concept of continuous product research and innovation, the present inventor has been engaged in product design and development for many years, as well as actively concentrating on research and development thinking, through numerous actual tests and experiments, resulting in the generation of the present invention.

Contents of the invention

The object of the present invention is to provide a knee joint structure that can increase walking safety and save effort.

For reaching above-mentioned purpose, solution of the present invention is:

A knee joint structure, comprising: a knee joint head with a reset hole, a piston, an elastic body, and an adjustment cover inside the reset hole, the two ends of the elastic body are respectively against the piston and the adjustment cover, the The knee joint head has a shaft hole, and the shaft hole is provided with a transmission shaft, and the transmission shaft has a notch, and the notch is provided with a push rod shaft, and the push rod shaft is pivotally connected with a push rod that can push the piston; a knee joint body , has a connecting rod, one end of the connecting rod is pivotally connected to the knee joint head by a first axis, and the knee joint body has a second axis; at least one arc, and the two ends of the arc are respectively connected to the transmission shaft , the second axis.

Further, the piston is provided with a groove, and the end of the push rod protrudes into and interferes with the groove.

Further, a screw is passed through the transmission shaft, and the end of the screw presses against the push rod shaft to fix the push rod shaft in the notch.

Further, one end surface of the transmission shaft has a flat surface to form an irregular end surface shape, and the arc piece is provided with a fastening groove, and the shape of the fastening groove matches the shape of the irregular end surface and allows the one end of the transmission shaft to be locked on the fastening surface. groove.

Further, the adjusting cover is screwed to the reset hole and has an adjusting slot.

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

Further, the piston is pivotally connected to one end of the push rod via a piston shaft.

After adopting the above-mentioned technical means, when the knee joint is bent, the push rod can push the elastic body to reserve the elastic force, and when the knee joint reversely pivots, it can be restored to the original state by the elastic force of the elastic body; by setting the reset device and the push rod on the knee Joint head, the critical angle of knee joint bending in the present invention can be greater than the bending angle when walking, so as to ensure that each step can complete normal walking gait, and improve the conventional technology. The expected disadvantage of continuing to bend and prone to fall injuries can enhance safety.

In addition, the position of adjusting the strength of the elastic body is improved to facilitate the adjustment of the strength according to the walking speed of the user, making walking more labor-saving.

Description of drawings

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

Fig. 2 is a three-dimensional exploded view of the present invention.

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

Figure 4 is a rear view of the present invention.

Fig. 5 is a sectional view at A-A of the present invention.

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

7 to 8 are sectional views of usage examples of the present invention. Figure 7 shows that the walking bending angle is about 60°~80°, which is less than the critical angle; Figure 8 shows that the joint bending angle is greater than 90° but still less than the critical angle.

Fig. 9 is a cross-sectional view of an application example of adjusting the strength of the elastic body according to the present invention.

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 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 showing an example of use of the present invention in a walking gait. The middle picture shows that the bending angle of the fast walking gait is less than the critical angle, and the right picture shows that the walking gait can return to a straight state.

15 to 17 are sectional views of usage examples of conventional techniques. Figure 16 shows that the bending angle of the walking gait is less than 90°, but has exceeded the critical angle; Figure 17 shows that the knee joint structure is abnormally bent backwards.

Figure 18 is a schematic illustration of an abnormal gait caused by conventional techniques. The middle image shows that the bending angle is greater than the critical angle in a fast walking gait, and the right image shows that the knee joint structure is abnormally bent backward during a walking gait.

【Symbol Description】

Knee joint head 10 Reset hole 11 Piston 12

Groove 121 Piston shaft 122 Elastic body 13

Adjustment cover 14 Adjustment groove 141 Shaft hole 15

Drive shaft 16 gap 161 screw 162

Plane part 164 Push rod shaft 17 Push rod 18

Knee joint body 20 Connecting rod 21 First axis 22

Second axis 23 Arc piece 30 Fastening groove 31

Common techniques:

Knee joint head 91 Knee joint body 92 Reset device 921

Connecting rod 93 projection 931 arc piece 94.

Implementation

The following is a detailed description based on specific embodiments and drawings.

Please refer to FIG. 1 to FIG. 6 , the present invention includes a knee joint head 10 , a knee joint body 20 , and two arc pieces 30 . It will be explained in detail below:

The knee joint head 10 has a reset hole 11, and the reset hole 11 has a piston 12, an elastic body 13, and an adjustment cover 14. Referring to Fig. 1, Fig. 5 and Fig. 14, the reset hole 11 is arranged inside the front side of the knee joint head 10, the adjustment cover 14 is arranged in the reset hole 11 and on the front side surface of the knee joint head 10, the Knee joint head 10 has a shaft hole 15, and this shaft hole 15 is provided with a transmission shaft 16, and this transmission shaft 16 has a breach 161, and this breach 161 is provided with a push rod shaft 17, referring to Fig. 6 to Fig. 8, this push rod shaft 17 is located at an eccentric position on one side of the transmission shaft 16 , and the push rod shaft 17 is pivotally connected with a push rod 18 capable of pushing the piston 12 .

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 through a first axis 22, and the knee joint body 20 has a second shaft Heart 23.

Two ends of the arc piece 30 are respectively connected to the transmission shaft 16 and the second shaft 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 be stabilized within the range of the groove 121 to avoid Offset push piston 12 .

In one embodiment, the transmission shaft 16 is threaded with a screw 162 , and the end of the screw 162 presses against the push rod shaft 17 to fix the push rod shaft 17 on the notch 161 .

In one embodiment, one end surface of the transmission shaft 16 has a flat portion 164 to form an irregular end surface shape, and the arc piece 30 is provided with a fastening groove 31, and the fastening groove 31 is shaped to match the irregular end surface shape and make the transmission shaft One end of 16 is locked in the fastening groove 31, so that the arc piece 30 and the transmission shaft 16 can be interlocked with each other.

The above is the introduction of each component of the present invention and its composition mode, and then the use embodiment, characteristics and benefits of the present invention are introduced as follows:

Please refer to Fig. 7 and Fig. 8. When the knee joint of the present invention is bent, it drives the transmission shaft 16 to rotate an angle so that the push rod 18 can push the elastic body 13 through the piston 12 to reserve the elastic force. 13 elastic force and return to the original state, that is to say, reversely push the push rod 18 with the elastic force of the elastic body 13 to make the transmission shaft 16 reversely rotate and drive the arc piece 30 and the knee joint body 20 to swing in the opposite direction towards the knee joint head 10.

By setting the reset device and the push rod 18 on the knee joint head 10, the critical angle of knee joint bending in the present invention can be set according to the position of the push rod shaft 17 on the drive shaft 16, and is usually set larger than the maximum walking bending angle More than 20°. It is greater than the maximum bending angle when walking (see Figure 14), to ensure that each step can complete the normal walking gait, and to improve the conventional technique. After the knee joint bends beyond the critical angle, it causes the knee joint that should have been straightened to be unintended. The disadvantage of continuing to bend and easily falling and hurting can improve safety.

In addition, the strength adjustment position of the elastic body 13 is improved so as to adjust the strength conveniently according to the walking speed of the user, so that the walking is more labor-saving.

Please refer to Fig. 1 and Fig. 9. In one embodiment, the adjustment cover 14 is screwed to the reset hole 11 and has an adjustment slot 141. The user can insert the adjustment slot 141 with a hand tool and then turn the adjustment cover 14 to move forward and backward. , to compress or loosen the elastic body 13 to achieve the purpose of adjusting the elastic force.

Please refer to FIG. 10 , in one embodiment, the push rod shaft 17 passes 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 to FIG. 13 , in one embodiment, the piston 12 is pivotally connected to one end of the push rod 18 via a piston shaft 122 , so that the push rod 18 can push the piston 12 stably and avoid deviation.

The above-mentioned embodiments of this case are only for the convenience of explanation, and should not limit the meaning of this case, that is, all the various transformation designs based on the scope of the listed patent application should be included in the scope of the patent of this case. middle.

Claims (7)

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.

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