Hardware & Devicesconcept · 4 min · updated Jun 28, 2026
Printed circuit boards (PCB)
By HealthAtoms Editorial (AI-assisted draft)Awaiting expert review
The green board everything is soldered to — and the copper traces that wire the components together. In a medical device, the PCB is also where reliability and electrical safety are designed in.
In one line
A printed circuit board is an insulating board with copper traces etched onto it that connect the components — replacing a tangle of wires with a flat, repeatable, mass-producible layout.
<figure style="text-align:center;margin:1.5rem 0"> <svg viewBox="0 0 320 150" role="img" aria-label="A circuit board with components connected by copper traces" style="width:100%;max-width:360px;height:auto;color:var(--c-iot)"> <rect x="14" y="14" width="292" height="122" rx="8" fill="none" stroke="currentColor" stroke-width="2"/> <rect x="120" y="50" width="56" height="44" rx="3" fill="none" stroke="currentColor" stroke-width="2"/> <text x="148" y="76" font-size="10" fill="currentColor" text-anchor="middle">MCU</text> <rect x="40" y="60" width="34" height="16" rx="2" fill="none" stroke="currentColor" stroke-width="1.5"/> <rect x="240" y="40" width="16" height="34" rx="2" fill="none" stroke="currentColor" stroke-width="1.5"/> <rect x="220" y="100" width="34" height="16" rx="2" fill="none" stroke="currentColor" stroke-width="1.5"/> <path d="M74 68 H120" fill="none" stroke="var(--brand)" stroke-width="2"/> <path d="M176 60 H240 V74" fill="none" stroke="var(--brand)" stroke-width="2"/> <path d="M148 94 V118 H220" fill="none" stroke="var(--brand)" stroke-width="2"/> <circle cx="120" cy="68" r="2.5" fill="var(--brand)"/><circle cx="240" cy="74" r="2.5" fill="var(--brand)"/><circle cx="148" cy="118" r="2.5" fill="var(--brand)"/> <text x="160" y="30" font-size="10" fill="var(--text-3)" text-anchor="middle">copper traces wire the parts together</text> </svg> </figure>How it works
- Pads & traces — components solder to copper pads; traces route signals and power. A board can have several stacked copper layers (with vias between them).
- Surface-mount parts dominate; manufacturing files (Gerbers + a bill of materials) let a factory build thousands identically.
- Not just connections — trace width carries current and sheds heat; spacing provides isolation; the ground layer fights noise.
Where it shows up in digital health
- The board inside every device carries the MCU, sensors, power and radio.
- Patient isolation is laid out on the board — a physical gap keeping mains-side and patient-side copper apart, a core IEC 60601 requirement.
- Reliability by design — conformal coatings, strain relief, derated parts. Flexible PCBs bend to fit patches and wrist devices.
Watch for
The schematic says what should connect; the layout decides whether it works — noise, heat, and isolation problems are born in the copper, not the diagram.