Proportional Drive Control
A powered wheelchair control interface in which the speed and direction of the chair are proportional to the degree of deflection applied to the input device, typically a joystick.
Full Definition
Proportional drive control contrasts with non-proportional (or 'switched') drive, where the chair responds at a fixed speed regardless of input magnitude. The most common proportional control is the centre-mounted hand joystick; other proportional interfaces include head arrays with proportional mapping, chin controls, and some foot controls. In rehab technology documentation, editors encounter 'proportional drive' in powered wheelchair prescriptions, assistive technology assessment reports, and user training guides. It is critical to distinguish proportional from non-proportional drive in funding documents because the interface type affects HCPCS coding and the clinical justification for alternative drive controls.
Usage
Usage note: Clearly distinguish from 'switched' or 'non-proportional' drive in all prescriptions and funding documents; the distinction is clinically and financially significant.
In Context
- "The client demonstrated sufficient hand strength and coordination to use standard proportional drive control without adaptation." — Powered mobility evaluation report
- "When editing the prescription, confirm whether 'proportional' or 'switched' drive is specified, as the two require different HCPCS codes." — Equipment funding document