Microprocessor Controlled Systems

Microprocessor Controlled Systems

What are microprocessor controlled systems?

Microprocessor-controlled prosthetic systems use sensors and an onboard processor to adjust a joint or terminal device in real time. In the arm, this usually means myoelectric or similar powered hands, wrists, or elbows: muscle signals on the residual limb are read by electrodes and drive motors. In the leg, microprocessor knees (and some ankles) adjust resistance through stance and swing. The processor assists. It does not replace the user’s attention or training.

Why are microprocessor controlled systems used?

These systems are considered when a mechanical or body-powered device cannot meet the person’s safety or task needs, and when the user can charge, maintain, and be trained on the device. Myoelectric arms can provide grasp without a harness. Microprocessor knees can improve stumble recovery and vary cadence. Candidacy depends on residual-limb signal quality or strength, cognitive ability to use the device, environment (water, dust), and funding criteria, not on the presence of a processor alone.

What are the benefits of microprocessor controlled systems?

• May provide stronger, more graded grasp than a body-powered hand (myoelectric)
• May improve stability and reduce fall risk with a microprocessor knee in selected walkers
• Can reduce the need for a shoulder harness in some upper-limb fittings
• Requires charging, protection from the elements, and follow-up. Benefits appear only with proper training and a well-fitted socket