Custom membrane switches and graphic overlays are ideally suited to the demands of medical devices

Membrane switches and graphic overlays offer the key requirements of reliability, portability, a high degree of visibility, and cleanliness for medical devices, instrumentation, and diagnostic equipment. Applications include patient monitors, infusion pumps, X-ray machines, anesthesia controls, imaging devices, handheld systems, defibrillators, incubators, and many more.

Specific advantages of membrane switches and graphic overlays for medical devices include:

• Cleanliness – The exterior layer of a membrane switch is easily cleaned and sanitized. The material is designed to withstand industrial cleaning chemicals. Also, antimicrobial film can be applied to further inhibit bacterial contamination.
• Shielding – Electro-static discharge (ESD) protection can be incorporated into the design. Plus, electro-magnetic interference (EMI) and radio frequency interference (RFI) shielding layers can eliminate potential interference from ambient signals.
• Graphics/visibility – When properly designed, indications, warning lights, LEDs and other overlay functions can be viewed from 180 degrees and at a distance. (This high visibility cannot be accomplished with a touch screen interface.)
• Sealable exterior – The continuous single-piece nature of the exterior layer of a membrane switch combined with gaskets or perimeter sealing protects circuitry from dust, water, and chemicals.
• RoHS compliance – Membrane switches and components can be manufactured to meet the strict standards of RoHS compliance.
• Lightweight and compact – This is particularly important for portable medical devices.