There are cervical traction devices for sale in Shanghai. Now in the age of online shopping, you can go to Taobao to buy one!
I checked on Taobao not long ago: Medex cervical traction device N05 hand Pull-type stent cervical traction device
Go to Taobao homepage to search: medex cervical vertebra traction device N05 medex Shenzhen store
Medex cervical vertebra traction device N05 hand-pull bracket traction cervical vertebra