Passive Robots for Stroke Rehabilitation: A Feasibility Study
Stroke
What this study involves
The registry says this study is recruiting. Individual locations may have different availability.
- Study type
- Interventional
- Phase
- Not applicable
- Age range
- 18 years - 75 years
- Sex eligible
- All sexes
- Healthy volunteers
- Not accepted
- Participants
- 4 Estimated
These are starting points, not an eligibility decision. The research team must review the full requirements.
About the research
The purpose of this study is to examine the feasibility and effectiveness of a novel, multimodal approach that combines passive devices with noninvasive neuromuscular stimulation for upper extremity rehabilitation after stroke.
Read the full description
About 800,000 individuals suffer from a stroke every year in the United States. The majority of stroke survivors often experience lingering deficits in upper extremity function. High-end robotic devices can improve outcomes and clinical productivity; however, these devices are expensive and bulky, making them not practical for many clinical or home environments. This study aims to evaluate the feasibility of low-cost non-motorized devices for stroke rehabilitation in a long-term intervention. The intervention will involve training with a table-top, semi-passive (i.e., no motors) exercise equipment called SepaRRo and commonly-used neuromuscular stimulation. The stimulation will be provided during functional activities using a custom controller (NeuRRoFES) to trigger stimulation. These instruments are designed to provide flexible, compliant assistance/resistance to improve upper extremity function and can be used in a home setting. The study will measure technical feasibility (e.g., qualitative survey, adherence, time on task, retention, ability to perform tasks) as well as clinical feasibility (i.e., changes in biomechanical, neurophysiological, and functional measures) of an intervention with these devices in stroke survivors. The findings aim to support the development of affordable, home-use rehabilitation systems for stroke patients.
Who may be able to participate?
The list below is the sponsor’s full registry wording. It can include conditions, prior treatment, test results and other requirements. A match in search does not mean you qualify.
Inclusion Criteria:
- Age 18 to 75 years;
- Ischemic or hemorrhagic stroke confirmed by CT, MRI, or clinical criteria;
- No major deficits of sensation or proprioception;
Exclusion Criteria:
- Bilateral stroke
- Unable to think clearly and remember (Mini-Mental State Exam score \< 22 and miniMOCA \< 8);
- Uncontrolled Diabetes or Hypertension;
- Severe limitations of joint range of motion that will lead to inability of testing
- Severe spasticity and joint contractures that will lead to inability of testing
- Complete paresis with no possible movements
- Severe aphasia
- Any other medical condition that will significantly impact the study results
- Unable to obtain reliable motor evoked potentials
- Are pregnant or are actively trying to conceive
- Have a recent history of repeated fainting spells or syncope.
- Have a recent history of seizure (epilepsy) while on anti-seizure medication
- Have a recent history of skull fracture/head injury
- Have metal implants in the skull
- Have cardiac pacemakers
Treatment, groups and participation
The registry may describe treatments and study duration without a complete visit calendar. Ask the study team for the exact schedule, procedures, risks, costs and alternatives. Keep your usual care plan unless your treating clinician tells you otherwise.
- Assignment
- Not applicable
- Masking
- No masking
Robotic Intervention
Participants will receive upper extremity rehabilitation using SepaRRo and NeuRRoFES 2-5 times per week for 2-6 weeks
Device: Functional Training with SepaRRo and NeuRRoFES
Functional Training with SepaRRo and NeuRRoFES DEVICE
Participants will perform functional movements (e.g., reach for targets) with their extremities. During movements, the devices will be used to assist or resist their motion. Participants may receive biofeedback of their movements to better engage them in training. Participants may receive assistance from the devices (including neuromuscular stimulation) and/or their less-impaired limb.
What researchers are measuring
Outcome measures describe what is being studied. They are not proof that a treatment works.
Primary measures
Device Survey For Feasibility
Time frame: Post-intervention (immediately following last session of intervention)
Subjective feedback regarding feasibility of the device for training
Other measures
Retention
Time frame: Post-intervention (immediately following last session of intervention)
Measure of how many participants completed intervention
Adherence
Time frame: Post-intervention (immediately following last session of intervention)
Measure of percentage of sessions completed
Upper extremity Fugl-Meyer Score
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively.
Changes in upper extremity Fugl-Meyer score from before the intervention (from baseline) to after its completion using publicly available scoring sheets. The Fugl-Meyer score is a measure of functional impairment and runs from 0 to 66 points, with higher numbers reflecting better outcome.
Reachable workspace
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in reachable workspace from before the intervention (from baseline) to after its completion). The reachable workspace area will be measured with SepaRRo obtained from optical encoders mounted in the device.
Voluntary hand opening
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in voluntary ability to open the hand from before the intervention (from baseline to after its completion). Voluntary hand opening will be measured with motion capture equipment.
Action Research Arm Test Score
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in the Action Research Arm Test Score from before the intervention (from baseline) to after its completion using publicly available scoring sheets. The Action Research Arm Test is a measure of arm functional ability and runs from 0 to 57 points, with higher numbers reflecting better outcome.
Box and Block (BBT)
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in functional measure of arm disability (BBT) from before the intervention (from baseline) to after its completion using publicly available scoring sheets.
Hand Strength
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in force produced by the hand from before the intervention (from baseline) to after its completion as measured by force production recorded with a dynamometer
Arm strength
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in force produced by the arm from before the intervention (from baseline) to after its completion as measured by force production recorded with a dynamometer
Muscle coordination
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in muscle coordination of the upper extremity muscles as measured using surface electromyography between before the intervention (from baseline) to after its completion.
Joint coordination
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in coordination of the upper extremity joints as measured motion capture between before the intervention (from baseline) to after its completion.
Corticospinal excitability
Time frame: Baseline and post-intervention measurements will be taken on separate days, within a week of the first and last sessions of the intervention, respectively
Changes in corticospinal excitability of the upper extremity muscles as measured using surface electromyography and transcranial magnetic stimulation between before the intervention (from baseline) to after its completion
Review the complete result tables and limitations in the official record.
Open official results ↗Research locations (1)
The overall study status and a local site’s status can differ. Confirm that location’s availability before traveling.
1 locations
University of Michigan - NeuRRo LabAnn Arbor, Michigan, United StatesRecruiting
Study team and timeline
- Lead sponsor
- University of Michigan
- Study start
- Nov 5, 2025 Actual
- Primary completion
- Oct 1, 2027 Estimated
- Study completion
- Oct 1, 2027 Estimated
- First posted
- Oct 20, 2025 Actual
- Last updated
- Nov 10, 2026 Actual
Official study contacts
Official study title
Passive Robots for Stroke Rehabilitation
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Source: ClinicalTrials.gov API v2. Information is submitted by sponsors and investigators. NLM does not approve the safety or science of all listed studies. Registry disclaimer.
Retrieved: Nov 12, 2026 · Last registry update: Nov 10, 2026
