Bionic prosthetic hand

Abstract

Provided is a bionic prosthetic hand, comprising: a palm part (1); a finger part (2) having an index finger component (21), a middle finger component (22), a ring finger component (23), a little finger component (24) and a thumb component (25), wherein the index finger component (21), the middle finger component (22), the ring finger component (23) and the little finger component (24) are separately connected to the upper end of the palm part (1) in a manner of being capable of opening or closing; and a web part (3) vertically rotatably connected to the inner side of the palm part (1), the thumb component (25) being connected to the web part (3) in a manner of being capable of opening or closing. The thumb component (25) of the bionic prosthetic hand can rotate inwards or outwards, and the index finger component (21), the middle finger component (22), the ring finger component (23), the little finger component (24) and the thumb component (25) can realize spreading and flexion actions. The bionic prosthetic hand has a low weight, and is convenient for a patient to wear and use for a long time.

Description

technical field [0001] The invention relates to a prosthetic hand, in particular to a bionic prosthetic hand in the field of rehabilitation medical equipment. Background technique [0002] Myoelectric prosthetic hands can replace missing limbs and provide convenience for the daily life of disabled patients with missing upper limbs. It is one of the important research directions in the field of rehabilitation engineering. [0003] The safe proportional control myoelectric prosthetic hand in the existing products has only three fingers: thumb, index finger and middle finger, and it can only realize the single-mode action of opening or closing the hand to complete grasping; in addition, the safe proportional control myoelectric The fingers of the prosthetic hand are an integrated structure, which cannot realize coupled motion based on multi-joints. Therefore, the practicality of this product in daily life is not high. [0004] In the existing products, there is also a prosthe...

AI Technical Summary

Problems solved by technology

However, the metacarpal wrist joint of the thumb of this kind of prosthetic hand does not have an independent degree of freedom, so the internal or external rotation of the thumb needs to be assisted by manual rotation; in addition, although it realizes the bionic design in appearance and action, but Due to the heavy weight (more than 500g), it will cause a great burden to the patient, so it is not suitable for long-term wearing

[0005] At present, although the existing multi-degree-of-freedom myoelectric prosthetic hand gives each joint a degree of freedom to realize the independent movement of a single finger and joint, the number of movements can be large, but due to the large number of motors, the control system is complicated and the maintenance cost is high; in addition , due to the heavy weight, the patient is prone to soreness, fatigue and other problems after wearing it for a long time, so that it cannot be worn and used for a long time

Therefore, this kind of prosthetic hand is not only greatly reduced in practicability, but the most important point is that it is expensive, and it is difficult for ordinary patients to be accepted by ordinary families.

[0006] Secondly, the structure of myoelectric prosthetic hands on the market is made of metal for the main part, which not only increases the weight, but also uses traditional transmission methods such as gears at the joints, and the multi-stage meshing makes the transmission efficiency poor, and the torque of the motor cannot be obtained. Maximize it, and eventually lead to the need to use a more expensive, larger, high-torque output motor to make up for it

However, such remedial measures have increased the cost and increased the weight

[0007] In addition, the grasping ability of existing myoelectric prosthetic hands is not satisfactory, not only when grasping objects due to the interference of other fingers, the user has to change and adjust the appropriate grasping posture through auxiliary movements of the upper limbs, but also in When grasping an object, the stability of grasping the object is not enough because the structure of the finger pulp does not have viscoelastic properties with a certain covering force and friction force

Moreover, when the fingers are subjected to lateral (parallel to the plane of the palm) external force, the finger joints are prone to damage due to the absence of a load protection structure, which greatly reduces the practicability of the entire prosthetic hand, and this directly leads to users thinking that Myoelectric prosthetics have insufficient hand dexterity and a major reason for their low practicability

[0008] Furthermore, due to the fact that the shape of the existing myoelectric prosthetic hand is not bionic enough, when the patient wears the prosthetic hand in public, it is easy to attract the attention of the surrounding people, which makes the wearer feel conflicted, thus reducing the willingness to use it, causing them to prefer to use it without any movement Functional decorative prosthetic hands, but also resist the use of myoelectric prosthetic hands that are not bionic enough in shape

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