Mechanical joint damping to reduce action tremors.
Action tremors (postural, kinetic or intention) occur during voluntary muscle activity, such as reaching for a glass or holding a posture. This type of tremor can occur in Essential Tremor, Parkinson’s disease, MS, dystonia and many other tremor disorders.
Essential tremor (ET) is the most common movement disorder, affecting roughly 5-6% of the adults of 65. Many ET patients remain undertreated due to medication side effects, poor tolerability, or reluctance to pursue surgical options.
Mechanical joint
damping
The Stil Hand Control ™ is a specialized anti-tremor orthosis. Unlike a standard brace that simply locks a joint, the orthosis adds damping to the joints in the forearm. This mechanical joint damping suppresses fast motion, like tremors, while allowing slow voluntary movements.
Class I passive medical device – does not use any form of electrical stimulation and is battery-free. The orthosis can be worn over or under clothing and can be easily donned by individuals with shaking hands, thanks to its magnetic clips.
The orthosis is a passive system; it instantly reacts to movements and provides instant tremor reduction. Moreover, real-world clinical evidence indicates that the effectiveness of the orthosis remains stable over longer periods (>1 year).
Mechanical joint damping can introduce minimal side effects (e.g., muscle fatigue, discomfort on hand). This can be considered minor compared to side effects or other tremor treatments (drowsiness, cognitive impairment, impotence).
Patient Selection Criteria
Clinical indications and exclusion criteria for the Stil Hand Control™
Study design
In a randomised crossover trial involving 24 essential tremor patients, the Stil Hand Control™ was compared to an identical sham device without damping. Tremor severity was assessed using the TETRAS scale, a validated clinical rating scale for essential tremor (0 to 4 score across functional tasks). Tremor power was derived from accelerometery data.
Key results
The Stil Hand Control™ demonstrated a minimal clinically important difference (at least 1 TETRAS point reduction) for each of 7 functional tasks, and over 87% tremor power reduction on average.
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¹ Mugge, W., Helmich, R.C., Kamphuis, D.J. et al. (2025). Essential Tremor Suppression with a Novel Anti-Tremor Orthosis: A Randomized Crossover Trial. Movement disorders : official journal of the Movement Disorder Society, 40(3), 445–455. · https://doi.org/10.1002/mds.30082