Brain zapper for binge eating? tiny trial tests implant
NCT ID NCT03868670
First seen Jun 27, 2026 · Last updated Jul 30, 2026 · Updated 2 times
Summary
This early study tests a brain implant that monitors and stimulates brain activity to reduce loss-of-control eating in people with severe obesity who haven't been helped by other treatments. Only 6 participants will receive the device, and the main goal is to check safety and see if it works. It's a very small first step, so results won't be conclusive.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- responsive neurostimulation device (RNS System)
- What this could lead to
- If it works, this could point toward a new treatment option for people with severe obesity who haven't been helped by other therapies.
- What could go wrong
- This is a very early, tiny study with only 6 people, focused on safety. It may not show clear benefit, and brain surgery carries risks like infection or side effects from the implant.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 6 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Apr 2019
- Expected to finish
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Jan 2028
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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22 to 70 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * BMI 35-60 kg/m2 * Failure of at least one pharmacological agent intended for weight loss or binge eating disorder (select glucagon-like-peptide 1 \[GLP-1\] receptor agonists for the treatment of type 2 diabetes, which induce clinically meaningful weight loss \[i.e., \>2% baseline weight\], qualify as agents intended for weight loss, as do glucose-dependent insulinotropic polypeptide \[GIP\]/GLP-1 agonists) * Failure of at least one form of behavioral therapy, such as weight loss therapy and cognitive behavioral therapy (minimum cumulative trial of 6 months) * Failure of gastric bypass surgery or sleeve gastrectomy surgery * Assessment by the study site's bariatric surgeon to rule out technical explanations for suboptimal outcome with an upper GI series within 6 months prior to consent (i.e. a pre-study referral assessment) or prior to surgery during the screening phase. * Presence of LOC over eating (≥4 LOC episodes per week or ≥16 episodes per month (i.e. 28 days)), as reported on the ELOCS or the EDE interview * Any medical (including psychiatric) conditions must be monitored actively by appropriate discipline and stable for the past 6 months. Related therapies or medications should be held stable for the study duration. * Surgical suitability confirmed by a psychiatric examination. * Subject is able to attend all scheduled clinic appointments on their own or with a caregiver. * Subject is willing and able to complete signaled EMA assessments. * Adequate social support (e.g. stable housing, identified family member or close friend as emergency contact) without acute or subacute psychosocial stressors based on screening interview * Premenopausal women must agree to use acceptable methods of birth control. * Participants provide voluntary, decisionally capable, and appropriately informed consent. - Subject is able to comply w/ all testing and follow-up requirements defined by the study protocol. * Participant has no immediate plan for relocation beyond 6 hours of the study site. * Proficiency with the English language. Exclusion Criteria: * Subject has an implanted medical device that delivers electrical energy to the brain. * Subject has an implantable cardiac pacemaker, defibrillator, or neurostimulator. * Subject requires diathermy treatments. * Subject requires transcranial magnetic stimulation (TMS) or electroconvulsive therapy. * Subject is likely to require repeat magnetic resonance imaging (MRI) after implant of the RNS Neurostimulator and Leads. * Subject is unable to fit into Computerized Tomography (CT) scanner (500lb upper weight limit for CT scanner). * Subject is pregnant or intends to become pregnant during the course of the study. * Subject is participating in a therapeutic investigational drug or device study. * Subject has medical contraindications for surgery including but not limited to severe cardiovascular, pulmonary, renal, liver, hematological disease, severe coagulopathy, or an acute infectious process. * Subject has evidence of neurological disorders, e.g. seizure disorder, multiple sclerosis, severe acquired brain injury, severe brain atrophy, subdural hematoma, history of hemorrhagic stroke, or other clinically relevant abnormality on preoperative imaging. * Subject has a current physical or medical condition that could affect eating behavior (e.g., cancer, pregnancy). * Subject is actively using medication known to affect eating (e.g., appetite suppressants). * Subject has a clinically significant or unstable psychiatric condition based on psychiatric screening interview. * Subject has a clinical diagnosis (past or present) of severe anxiety disorder, severe major depression, psychosis, or anorexia based on diagnostic interview. * Subject has any lifetime history of suicide attempt, intent or engagement in other forms of self-harm behaviors (e.g. cutting). * Subject has a history of drug abuse or dependence, including nicotine and alcohol, within the preceding 24 months. * Subject has current use of alcohol at the rate of \> 14 drinks per week or \> 4 drinks per occasion or any diagnosis of substance abuse/dependence disorder based on DSM-5. * There is evidence of incipient dementia or cognitive impairment on Neuropsychological assessment by any score on memory, executive functioning, intellectual functioning, language, or visuospatial domains falling 2SD below the normative mean. * There is evidence of comprehension difficulties (Token Test \<36). * Subject is unable to provide informed consent to treatment. * Obesity is secondary to another medical condition, a medication side effect, or a genetic syndrome. * Subject is a candidate for revision of their bariatric surgery due to anatomical or medical co-morbidities that could be addressed. Of note, revision of a sleeve gastrectomy to a gastric bypass for to reverse weight regain alone is less frequently considered a worthwhile effort as the average weight loss of such a revision is about a 10% weight loss. Thus, patients who have a sleeve and meet the Reinhold classification will be included in this study.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Stanford University
Stanford, California, 94301, United States
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University of Pennsylvania
Philadelphia, Pennsylvania, 19107, United States
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