But patenting and securing a manufacturer are costly and convoluted processes, so most amputees who try to improve prosthetic designs never see their ideas get past the workshop.

• 然而申请专利权与洽谈制造商所费不赀，而且旷日费时，所以对于试图改善义肢的截肢患者来说，他们的构想通常只能闭门造车。