Comparison of Four-Channel Functional Electrical Stimulation vs. One-Channel Electrical Stimulation on Moderate Arm/Hand Paresis in Subacute Stroke Patients

Inclusion Criteria: * First-time ischemic stroke with moderate arm paresis (Motricity Index - UE Sum-Score ≥ 40 ≤ 77 points) (Collin \& Wade, 1990) * Early to late subacute phase (7 days - 6 months) (Bernhardt et al., 2017) * Existing ADL ability before the event (ICF d5 self-care, d6 domestic life, extent of problem ≤1 points) (WHO, 2001) * Age ≥18 - 99 years * Signed and dated ICF before the start of any study-specific procedure. Exclusion Criteria: * Lack of compliance with any inclusion criteria * Implanted defibrillators, brain stimulators, pacemakers, medication pumps * Therapy-resistant epilepsy * Fever or infectious diseases * Inflammatory or tumorous skin diseases in the stimulation area, * Thromboses or vein inflammations * Severe contractures of the affected extremity * Wounds in the stimulation area * Pregnancy * Known allergic reactions to components of the investigational medical device * Unstable psychological status * Participation in other pharmacological clinical investigations within four weeks prior to enrolment * Anything that, in the opinion of the Investigator, would place the subject at increased risk or preclude the subject's full compliance with or completion of the study