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Treatment of obstructive sleep apnea using the Genio System

A Multicenter Study to Assess the Safety and Effectiveness of the Genio® Dual-sided Hypoglossal Nerve Stimulation System for the Treatment of Obstructive Sleep Apnea in Subjects With Complete Concentric Collapse of the Soft Palate.

NA · Nyxoah S.A. · NCT05592002

This study is testing a new device that stimulates a nerve to help people with moderate to severe obstructive sleep apnea breathe better during sleep when other treatments haven't worked for them.

Quick facts

PhaseNA
Study typeInterventional
Enrollment124 (estimated)
Ages22 Years to 75 Years
SexAll
SponsorNyxoah S.A. (industry)
Drugs / interventionsradiation
Locations16 sites (Colorado Springs, Colorado and 15 other locations)
Trial IDNCT05592002 on ClinicalTrials.gov

What this trial studies

This clinical trial evaluates the safety and effectiveness of the Genio® 2.1 System, which is designed to treat patients with moderate to severe obstructive sleep apnea (OSA) characterized by complete concentric collapse of the airway. The system utilizes an implantable stimulator that stimulates the hypoglossal nerve to prevent airway obstruction during sleep. Participants will be monitored for their response to the treatment and any associated risks. The study aims to provide an alternative for patients who have not tolerated or have failed traditional positive airway pressure treatments.

Who should consider this trial

Good fit: Ideal candidates are adults aged 22 to 75 with moderate to severe obstructive sleep apnea who have not responded to or cannot tolerate traditional treatments.

Not a fit: Patients with a body mass index over 32 kg/m2 or those with specific anatomical issues that do not allow for the use of the Genio System may not benefit from this study.

Why it matters

Potential benefit: If successful, this treatment could significantly improve sleep quality and overall health for patients suffering from obstructive sleep apnea.

How similar studies have performed: Previous studies have indicated a favorable risk-benefit ratio for similar hypoglossal nerve stimulation approaches, suggesting potential for success.

Eligibility criteria

Show full inclusion / exclusion criteria 
Inclusion Criteria:

* 1. Age from 22 to 75 years (inclusive). Participant cannot be under guardianship, under curatorship or under judicial protection.

  2. Body mass index (BMI) ≤ 32 kg/m2. 3. Positive cricomental space (≥ 0 cm). The cricomental space is the distance between the neck and the bisection of a line from the chin to the cricoid membrane when the head is in a neutral position.

  4. Has either not tolerated, has failed or refused positive airway pressure (PAP) treatments.

  5. Moderate to severe OSA (15≤AHI4≤65 where combined central and mixed AHI\<25% of the total AHI) based on a screening HST and confirmed in Baseline PSG.

  6. Complete concentric collapse at the level of the soft palate based on screening DISE.

  7. Willing and capable of complying with all study requirements, including specific lifestyle considerations, performing all follow-up visits and sleep studies, evaluation procedures and questionnaires for the whole duration of the trial.
* Exclusion Criteria:

  1. Inadequately treated sleep disorders other than OSA that would confound functional sleep assessment:

     1. Severe chronic insomnia,
     2. Insufficient sleep syndrome (\<6 hours sleep per night),
     3. Narcolepsy,
     4. Restless legs syndrome,
     5. REM behavior disorder,
     6. Others deemed sufficient disorders that would confound functional sleep assessment in the judgment of the investigator.
  2. Taking medications that may alter consciousness, the pattern of respiration, or sleep architecture as determined by the investigator.
  3. Major anatomical or functional abnormalities that would impair the ability of the Genio® System to treat OSA:

     1. Craniofacial abnormalities narrowing the airway or the implantation site,
     2. Palatine tonsil size 3+ or 4+ by the Brodsky Classification,
     3. Fixed upper airway obstructions (tumor, polyps, nasal obstruction),
     4. Congenital malformations in the airway,
     5. Hypoglossal nerve palsy (bilateral limited tongue movement, or unilateral unintended tongue deviation during protrusion),
     6. Existing swallowing difficulty as measured by a score of ≥3 on the EAT-10 questionnaire
     7. Others deemed sufficient to impair the ability of the Genio® System to treat OSA in the judgment of the investigator.
  4. Significant comorbidities that contraindicate surgery or general anesthesia:

     1. Revised Cardiac Risk Index Class III or IV,
     2. Persistent uncontrolled diagnosed hypertension despite medications,
     3. Coagulopathy or required anticoagulant or antiplatelet medications (such as warfarin, clopidogrel (Plavix) or similar; prophylactic aspirin not exclusionary) that cannot be safely stopped in the perioperative period, Subjects meeting any of the following criteria will be excluded from participation in this study:

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  1. Inadequately treated sleep disorders other than OSA that would confound functional sleep assessment:

     1. Severe chronic insomnia,
     2. Insufficient sleep syndrome (\<6 hours sleep per night),
     3. Narcolepsy,
     4. Restless legs syndrome,
     5. REM behavior disorder,
     6. Others deemed sufficient disorders that would confound functional sleep assessment in the judgment of the investigator.
  2. Taking medications that may alter consciousness, the pattern of respiration, or sleep architecture as determined by the investigator.
  3. Major anatomical or functional abnormalities that would impair the ability of the Genio® System to treat OSA:

     1. Craniofacial abnormalities narrowing the airway or the implantation site,
     2. Palatine tonsil size 3+ or 4+ by the Brodsky Classification,
     3. Fixed upper airway obstructions (tumor, polyps, nasal obstruction),
     4. Congenital malformations in the airway,
     5. Hypoglossal nerve palsy (bilateral limited tongue movement, or unilateral unintended tongue deviation during protrusion),
     6. Existing swallowing difficulty as measured by a score of ≥3 on the EAT-10 questionnaire
     7. Others deemed sufficient to impair the ability of the Genio® System to treat OSA in the judgment of the investigator.
  4. Significant comorbidities that contraindicate surgery or general anesthesia:

     1. Revised Cardiac Risk Index Class III or IV,
     2. Persistent uncontrolled diagnosed hypertension despite medications,
     3. Coagulopathy or required anticoagulant medications (such as warfarin, clopidogrel (Plavix) or similar; prophylactic aspirin not exclusionary) that cannot be safely stopped in the perioperative period,
     4. Degenerative neurological disorder (i.e., Parkinson's disease, Alzheimer's disease),
     5. Acute illness or infection,
     6. Any other chronic medical illness or condition that contraindicates a surgical procedure or general anesthesia in the judgment of the investigator.
  5. Diagnosed psychiatric disease (e.g., psychotic illness, uncontrolled major depression or acute anxiety attacks) that prevents participant compliance with the requirements of the investigational study testing,
  6. Substance or alcohol abuse history within the previous 3 years. Alcohol and substance abuse are defined as follows:

     i. Alcohol: no days with less than 3 or 4 standard drinks for women and men respectively ii. Substance: the use of any substance in an amount unapproved by the investigator or considered illegal. The drugs most commonly abused include cocaine, marijuana, heroin (or substitution treatment), prescription drugs (especially painkillers), methamphetamines, and various other illegal substances.
  7. Life expectancy of less than 12 months.
  8. Prior surgery or treatments that could compromise the effectiveness of the Genio® System:

     1. Airway cancer surgery or radiation,
     2. Mandible or maxilla surgery in the previous 5 years (not counting dental treatments),
     3. Other upper airway surgery to remove obstructions related to OSA in the previous 3 months (e.g., uvulopalatopharyngoplasty (UPPP), tonsillectomy, nasal airway surgery),
     4. Prior hypoglossal nerve stimulation device implantation.
  9. Has an Active Implantable Medical Device (AIMD) even if the device can be temporarily turned off.
  10. Participation in another clinical study with an active treatment arm.
  11. Plan to become pregnant, currently pregnant, or breastfeeding during the study period.

Where this trial is running

Colorado Springs, Colorado and 15 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.

View on ClinicalTrials.gov →

Conditions: Sleep Apnea, Obstructive

Last reviewed 2026-05-15 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.