Finger movement function rehabilitation apparatus driven by shape memory alloy wires

Abstract

The invention discloses finger movement function rehabilitation apparatus driven by shape memory alloy wires, and belongs to the field of finger rehabilitation. The apparatus is composed of the shapememory alloy wires, ropes, an alloy wire connecting terminal, an inner-layer fabric, an outer-layer fabric, range extending mechanism supports, rings, and other parts. When the shape memory alloy wires are powered on, the temperature rises under the current heat effect to generate phase changes, the contraction is generated, then the ropes are pulled, and fingers are driven to bend and stretch. The fabrics on the inner layer and the outer layer have good elasticity, and the tightness degree of the whole fabric can be adjusted in cooperation with Velcro on an arm. In addition, a proper amount of silica gel is placed between each layer of fabric to improve the wearing comfort of the apparatus. A length of the alloy wires extending out of the connecting terminal at the tail end is adjusted toadapt to different finger lengths, so that the requirement of ergonomics is better met. The three Velcro are located on the wrist, the forearm close to the elbow, and the big arm close to the elbow respectively. The three Velcro can enable the rehabilitation apparatus to be better attached to the shape of the arm of the human body, so that range extending mechanisms more efficiently use the phasechange contraction of the SMA wires to drive the fingers to bend and stretch, and thereby the better rehabilitation effect is achieved.

Description

technical field [0001] The invention relates to the field of finger rehabilitation, in particular to a finger motion rehabilitation device driven by a shape memory alloy wire. Background technique [0002] Stroke refers to a group of diseases that cause damage to brain tissue due to sudden rupture of blood vessels in the brain or blockage of blood vessels that prevent blood from flowing into the brain. It has a high morbidity rate, and hand motor function deficits have a great impact on patients' daily life and self-confidence. Therefore, a lot of relevant medical rehabilitation machines have been produced. [0003] For the central paralysis that may occur in stroke patients, medically, neurorehabilitation can be used to reshape the patient's brain function. The "puppet lifting" collaborative movement training method is often used through a specific device to induce a joint response. After several months of neurological rehabilitation treatment, the patient can regain the ...

AI Technical Summary

Problems solved by technology

Pneumatic drive is more common, but because of its complex structure, it will limit the flexibility of fingers, which will affect the rehabilitation effect; SMA wire drive uses SMA wire to energize and phase change contraction, so as to drive the actuator to control the flexion and extension of fingers, but SMA wire The amount of deformation of the wire is greatly affected by the quality of the SMA wire, and the amount of shrinkage is often insufficient; therefore, it is considered to use a range-extending mechanism composed of a rope and a nylon sheave to drive the flexion and extension of the finger. In the process of electrifying the SMA wire, the deformation of the SMA wire The volume can be magnified to six times by the range-extending mechanism, and a large range of flexion and extension of the hand can be realized by using the combination of SMA wire and pull wire structure

[0005] Although the cable drive requires a complicated set of cable devices, which increases friction and instability during the drive process

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