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Increasingly rapid urbanization,fewer rural land belongs,fewer and fewerfood markets.Many elderly people living in rural areas.Want to buy a dish of rural elderly need to charge more time,effort.If the time to buy too much，excess plastic bags will force hand pain.
If old people have a collar assistant on crutches，when buying too muchthings，he can take down collar assistant，hold in hand，avoid constantlychanging hands.It can be placed on the hand, elbow or shoulder，therecan be heavy pressure to slow down the role of the elderly .
Anhui Polytechnic University