In short
- A sleep apnea implant, or hypoglossal nerve stimulator, senses your breathing and gently stimulates the nerve that moves your tongue forward, which keeps the airway open during sleep.
- Under its 2023 FDA labeling, the US device is for adults with moderate to severe obstructive sleep apnea (AHI 15 to 100) who can't use or don't benefit from CPAP and who don't have a complete concentric collapse at the soft palate.
- In the STAR trial of 126 people, median AHI fell 68% at 12 months, from 29.3 to 9.0 events per hour.
- At five years, 75% of the 71 STAR participants who had a follow-up sleep study met the study's definition of a treatment response.
- In registry data reviewed by the FDA, serious adverse events at surgery occurred in 0.7% of patients. The most common later complaint was discomfort from the stimulation, reported by about 12%.
- The device is usually turned on about a month after surgery and then adjusted, with a follow-up sleep study to fine-tune it.
The sleep apnea implant is a small, battery-powered device that keeps your airway open by gently stimulating the nerve that moves your tongue. It's called hypoglossal nerve stimulation, or upper airway stimulation, and it's an option for people with moderate to severe obstructive sleep apnea who can't use CPAP. The research shows large improvements for many people who qualify, with a low rate of serious complications.
What is the sleep apnea implant?
The sleep apnea implant is a nerve stimulator placed under the skin during a surgical procedure. AASM Sleep Education describes it as a device that monitors your breathing while you sleep and stimulates your airway to help keep it open. The NHS lists it among other treatments for sleep apnoea, describing it as a device that sends small electrical signals to the nerve that controls your tongue.
In the US, the FDA approved the first of these devices in April 2014 under the name Inspire Upper Airway Stimulation, according to the FDA's premarket approval database. The FDA's generic name for the device type is an implanted hypoglossal nerve stimulator for apnea.
How does hypoglossal nerve stimulation work?
Hypoglossal nerve stimulation works by moving the base of your tongue forward each time you breathe in. In obstructive sleep apnea, the muscles of the upper airway relax during sleep and the tongue can fall back and block the airway. The implant counters that from the inside.
The FDA's safety summary describes three implanted parts:
- A pulse generator, which contains the electronics and battery in a titanium case and sits under the skin below the collarbone.
- A sensing lead, placed between the ribs, which detects your breathing.
- A stimulation lead with a cuff electrode wrapped around the hypoglossal nerve. When it fires, the base of the tongue moves forward to open the upper airway.
The generator times the stimulation to your breathing, delivering it from late in each breath out through the breath in. You control it with a handheld remote. The FDA summary says the remote turns therapy on before sleep and off when you wake, and lets you pause it or adjust the strength within limits your doctor sets.
Who qualifies for a sleep apnea implant?
Research: moderate (what this means)People who qualify for a sleep apnea implant have moderate to severe obstructive sleep apnea and have tried CPAP without success. The exact criteria come from the device's FDA labeling, which was expanded in 2023.
According to the FDA's 2023 summary of safety and effectiveness, the device is indicated for:
- Adults 22 and older with an AHI of 15 to 100 events per hour
- Who have been confirmed to fail, or can't tolerate, positive airway pressure such as CPAP or BPAP
- And who don't have a complete concentric collapse at the soft palate level
The FDA defines CPAP failure as an AHI still above 15 despite using it. It defines intolerance as being unable to use it more than 5 nights a week for more than 4 hours a night, or being unwilling to use it, for example returning the machine after trying it.
The labeling also covers adults 18 to 21 with moderate to severe sleep apnea, and teenagers 13 to 18 with Down syndrome and an AHI between 10 and 50, under extra conditions. Those conditions include not being effectively treated by tonsil and adenoid removal and having considered other therapies first.
Weight and the BMI warning
Weight matters, though the FDA treats it as a warning rather than a strict cutoff. The original approval was based on people with a BMI of 32 or less. In 2023 the FDA raised the BMI upper limit for which safety and effectiveness data is available to 40, based on registry data. AASM Sleep Education, in guidance written before that change, says candidates should not be significantly overweight.
Who shouldn't get one
The FDA labeling lists several contraindications:
- Central and mixed apneas making up more than 25% of the total AHI
- Any anatomy that would compromise the device, such as a complete concentric collapse of the soft palate
- Any condition that has affected nerve control of the upper airway
- Being unable to operate the remote, or not having help to do so
- Pregnancy or plans to become pregnant
- Another implanted device that might interact with it
- Needing MRI scans beyond what the device's MR conditional labeling allows
The airway exam before surgery
Before surgery, candidates have an airway exam under sedation. Cleveland Clinic's sleep surgery team describes this as drug-induced sleep endoscopy (DISE), which replicates sleep with a sedative infusion so the surgeon can see how the palate collapses. The FDA excluded people with a concentric collapse because they had lower success rates. AASM Sleep Education says you'll meet with an ear, nose and throat surgeon to see whether the procedure is an option, and have a sleep study before and after.
How well does the sleep apnea implant work?
The sleep apnea implant works well for many people who meet the criteria, based on a large trial and five years of follow-up. The evidence comes mainly from uncontrolled cohort studies rather than trials comparing it with other treatments, which is why we rate it as moderate.
The pivotal STAR trial, published in the New England Journal of Medicine in 2014, implanted the device in 126 people who had trouble accepting or sticking with CPAP. Their median AHI fell 68% after 12 months, from 29.3 to 9.0 events per hour. The oxygen desaturation index fell 70%. Sleepiness and quality of life also improved.
The trial included a neat test of whether the device itself was doing the work. Responders were randomly assigned to keep the therapy on or switch it off. In those who kept it on, AHI stayed low at 8.9. In those who switched it off, AHI climbed back to 25.8. The authors noted that the study had no control group for the main phase, and it was funded by the device maker.
Five-year results were published in 2018. Of the 126 original participants, 97 completed the protocol and 71 agreed to a follow-up sleep study. Among those 71, 75% met the trial's definition of a response, which was an AHI below 20 with at least a 50% reduction. Counting people who dropped out using their last result, the response rate was 63%. Normal sleepiness scores rose from 33% of participants to 78%.
Real-world results look similar. Cleveland Clinic reported that in 27 patients implanted in 2017, average AHI dropped from 46 to 4.6. That's one center's results, but it fits the trial data. The device doesn't work for everyone, and some people still need other treatments. Our guide to sleep apnea treatment options covers the alternatives.
Is the sleep apnea implant safe?
The sleep apnea implant is considered safe for a surgical treatment, with serious complications uncommon. In the STAR trial, the rate of procedure-related serious adverse events was under 2%. In the five-year follow-up, serious device-related events were reported in 6% of patients, all related to adjusting or repositioning the leads or device.
The FDA's 2023 safety summary includes a larger set of real-world data from the device maker's ADHERE registry. This table shows what was reported among people with an AHI up to 65.
| Event | How often it was reported |
|---|---|
| Serious adverse events around surgery | 0.7% of 3,572 patients |
| Serious adverse events during follow-up, mostly revisions | 2.8% of 1,483 patients |
| Any non-serious adverse event during follow-up | 27.2% |
| Discomfort from the stimulation | 12.2% |
| Insomnia or waking up | 5.4% |
| Discomfort at the incision or scar | 4.3% |
| Tongue abrasion | 2.9% |
| Swallowing or speech problems | 1.4% |
| Tongue weakness | 0.7% |
| Infection | 0.5% |
The FDA's list of possible risks is longer, as it is for any implanted device. It includes damage to nearby blood vessels, bleeding, nerve damage, reactions to the implanted materials, infection, swelling, persistent pain or numbness at the implant site, tongue soreness or weakness, problems swallowing or speaking, dry mouth, scarring, insomnia and a collapsed lung. It also notes that stimulation can change over time if the leads shift or the tissue around them changes.
Most of the common problems are about comfort and settings rather than lasting harm. Stimulation strength can be adjusted, and the five-year results show most serious events involved adjusting the leads or device. Still, it's surgery, and the decision is worth talking through carefully with a sleep surgeon.
What is recovery like?
Recovery from a sleep apnea implant is usually quick, with the device switched on a few weeks later. AASM Sleep Education says the device is implanted near the neck and chest in an outpatient procedure. Cleveland Clinic's team describes working in three areas: under the jaw to reach the nerve, over the chest muscle for the generator, and between the ribs for the sensing lead.
The device isn't used straight away. At Cleveland Clinic, it's activated about one month after surgery. The strength is then increased over the next month as you get used to it, and you have a titration sleep study to fine-tune the settings. AASM Sleep Education also mentions a sleep study after the procedure to check the results.
Your surgeon will give you specific instructions about wound care, activity and follow-up visits. If you're weighing this up, our guide to questions to ask your doctor can help you prepare.
How does it compare with other surgery?
The implant is different from most sleep apnea surgery because it doesn't remove or reshape tissue. AASM Sleep Education says the most common surgery, UPPP, is unlikely to cure moderate to severe sleep apnea on its own, and that some surgeries' benefits may not be permanent. The implant is adjustable instead, and can be turned off.
Like other surgery, though, it isn't a cure. Sleep apnea comes back when the device is off, as the STAR withdrawal test showed. If you're wondering whether your sleep apnea could ever resolve, see can sleep apnea go away. To understand the AHI numbers used throughout this article, see what is AHI.
This article is general information, not medical advice. A sleep specialist and surgeon can tell you whether you qualify.
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Common questions
What is the sleep apnea implant?
It's a small device placed under the skin of the upper chest, with one wire that senses breathing and another wrapped around the hypoglossal nerve under the jaw. At night it stimulates the nerve as you breathe in, moving the base of the tongue forward to keep the airway open. You turn it on with a remote before sleep.
Is the sleep apnea implant safe?
It has a good safety record for a surgical treatment. The pivotal STAR trial reported procedure-related serious adverse events in under 2% of people. Registry data reviewed by the FDA showed serious adverse events around surgery in 0.7%. Discomfort from stimulation and tongue irritation are the most common later complaints.
Is Inspire for sleep apnea safe?
Inspire is the brand name of the hypoglossal nerve stimulator approved by the FDA in 2014. Its FDA safety summary lists possible risks including infection, nerve damage, tongue soreness or weakness and discomfort from stimulation. In registry data, about 2.8% of people had a serious adverse event during follow-up, mostly device revisions. Talk to a surgeon about your own risk.
Who qualifies for a sleep apnea implant?
Under 2023 FDA labeling, adults 22 and older with an AHI of 15 to 100 who have failed or can't tolerate CPAP, and who don't have a complete concentric collapse at the soft palate. Adults 18 to 21 and some teenagers with Down syndrome may also qualify. Too many central apneas, pregnancy and certain other conditions rule it out.
What is the BMI limit for the sleep apnea implant?
The FDA labeling includes a BMI warning. In 2023 the FDA raised the upper BMI limit for which safety and effectiveness data is available from 32 to 40. Your surgeon will look at your weight alongside your airway exam and sleep study.
How long is recovery from a sleep apnea implant?
The surgery is usually an outpatient procedure. At Cleveland Clinic, the device is turned on about one month after implantation, its strength is increased over the following month, and then a sleep study is done to fine-tune the settings. Your surgeon will give you specific activity guidance.
Can you get an MRI with a sleep apnea implant?
Only within limits. The FDA labeling lists needing an MRI other than what the device's MR conditional labeling allows as a reason not to get the implant. Newer generators are MR conditional, so ask your surgeon which scans are possible before you decide.
Sources
- Premarket approval P130008: upper airway stimulation system
- Summary of safety and effectiveness data, P130008/S090
- Upper-airway stimulation for obstructive sleep apnea
- Upper airway stimulation for obstructive sleep apnea: 5-year outcomes
- Upper airway stimulation therapy
- Surgery
- A closer look at hypoglossal nerve stimulation for obstructive sleep apnea
- Sleep apnoea
About this article
- Research
- 8 published sources, listed above.
- Evidence
- Moderate. How we rate it
- Last checked
- October 14, 2026
- Funding
- Paid partner of Titan Recovery. Their ads are labeled.
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- Tell us. We log fixes on the corrections page.
* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.