Head Array
A proximity-sensor or switch-based drive-control interface mounted around a wheelchair headrest, allowing users with limited limb function to control a powered wheelchair using head movements.
Full Definition
A head array typically consists of three or more sensors positioned at the sides and rear of a headrest pad that detect head contact or proximity; each sensor maps to a directional drive command (left, right, forward) or to a mode switch. The device is used when a user cannot operate a standard joystick due to high-level spinal cord injury, muscular dystrophy, or other conditions affecting upper-limb function. Editors encounter the term in powered wheelchair prescriptions, complex rehab technology funding letters, and seating assessment reports. It is important to distinguish head array from head switches (discrete on/off contacts) and sip-and-puff controls (breath-activated). Accuracy matters for HCPCS coding and clinical justification.
Usage
Usage note: Not synonymous with 'head switch'; a head array involves multiple proximity sensors mapped to drive directions, whereas a head switch is a single binary input device.
In Context
- "The rehabilitation engineer recommended a head array after trialling multiple alternative drive controls with the C4-level SCI client." — Complex rehab technology evaluation report
- "Ensure the head array is documented as an alternative drive control in the Letter of Medical Necessity to support HCPCS E1230 coding." — Funding justification letter