If you've ever used a phone with a "Taptic Engine" or felt a controller rumble in your hands, you've used haptics. Medical-grade haptics is the same idea — turning code into a felt force — but scaled up in fidelity by several orders of magnitude.
What is haptic feedback?
Haptic feedback is a system that simulates the sense of touch through forces, vibrations or motions applied to a user. In a healthcare simulator, that means a stylus (or pair of styluses) that the trainee holds like a probe or scalpel, mounted in a robotic arm that pushes back against them as they move.
When the virtual stylus contacts virtual bone, the arm becomes stiff. When it cuts through soft tissue, it gives way. When it scrapes along enamel, it judders microscopically — exactly as a real probe would.
Why fidelity matters more than resolution
You can have a 4K screen and a 100Hz haptic loop and still have a toy. You can have a modest screen and a 1kHz haptic loop and have a clinical instrument.
The human hand can perceive vibrations up to roughly 1,000 Hz. A haptic device that only updates its force output 100 times per second feels "rubbery" — the contact lags behind reality. Update it 1,000 times per second with sub-millimetre positional accuracy and the user's brain stops thinking about the device entirely.
That's the threshold we engineer towards. Across the UNI SIM product range — from the Desktop to the dual-haptic UNI Dental 4.0 — the force loop runs at clinical fidelity.
What this unlocks for training
- Objective metrics. Force applied, tool angle, path deviation — all measurable.
- Procedural memory. Repetition with correct feedback builds the motor patterns trainees rely on under pressure.
- Safe failure. A learner can drill the wrong tooth on the simulator and learn from it. They cannot on a patient.
Further reading
If you want a deeper technical dive — control loops, force rendering, stiffness modelling — get in touch and we'll point you to our research papers and engineering write-ups.