AFOs are Becoming Popular
AFOs are becoming increasingly popular as a solution for individuals with lower limb disabilities. The concept behind this device is based on the concept of passive four-bar linkage. A four-bar linkage mechanism provides assistive force during the swing phase of gait, which is the part that causes the ankle to drop.
The device is made from a composite material with one steel joint on each side. It provides eight degrees of plantarflexion and twenty-six degrees of dorsiflexion. Its control system is a 40 MHz PIC18F microprocessor embedded in a small box.