Inspire and Hypoglossal Nerve Stimulation: Who Actually Qualifies

Let us be clear at the top, because the marketing around this is broad and the indication is narrow.

This is not a snoring treatment. Hypoglossal nerve stimulation is for diagnosed moderate-to-severe obstructive sleep apnea in people who have tried CPAP and cannot tolerate it. If you snore and have never had a sleep study, nothing on this page applies to you yet, and the useful next step is working out whether you have apnea at all.

For the people it does apply to, it is one of the more interesting developments in sleep medicine, and worth understanding properly.

What it actually does

A small device is implanted under the skin below the collarbone, with a lead running to the hypoglossal nerve — the nerve controlling tongue movement — and a sensor that detects your breathing pattern.

As you breathe in, the device delivers a mild electrical impulse to the nerve, which moves the tongue forward and slightly stiffens the airway at the moment it would otherwise collapse. It works with your breathing rather than against it, which is the conceptual difference from CPAP: rather than splinting the airway open with air pressure, it recruits your own muscle to hold it open.

You switch it on with a remote at bedtime and off in the morning. There is no mask, no hose, no humidifier, and nothing to travel with beyond the remote.

The eligibility criteria

These are specific, and the FDA indication was meaningfully widened in June 2023. As things stand:

• Age 18 or over
• Moderate-to-severe obstructive sleep apnea. The classic range is an AHI of 15 to 65; the 2023 expansion raised the upper limit to 100
• Failed or unable to tolerate CPAP — this is not optional, and it is the gate most people are surprised by
• BMI within limits. Historically 32 or below; the 2023 expansion moved the recommended upper threshold to 40
• Central and mixed apneas no more than 25% of total AHI. The device addresses obstruction, so a largely central picture is the wrong problem
• No complete concentric collapse of the soft palate

Two things worth flagging. First, insurance criteria are frequently stricter than the FDA indication, so being technically eligible and being covered are different questions — check with the insurer before getting attached to the idea. Second, the BMI limit is not arbitrary: results are less reliable at higher body weight, which is a clinical observation rather than a judgement.

The endoscopy that decides it

The last criterion is the one that catches people out, and it cannot be assessed from the outside.

Before implantation you undergo drug-induced sleep endoscopy — sedated, with a camera passed through the nose so the surgeon can watch how your airway collapses while you are asleep.

What they are looking for is the pattern of collapse at the soft palate. If it closes like a curtain from front to back, the device is likely to work. If the palate collapses concentrically — closing inward from all sides like a shutter — the device will not hold it open, because moving the tongue forward does not address that geometry. Complete concentric collapse is a contraindication, and it is found in a meaningful minority of otherwise-suitable candidates.

There is no way to predict this from your symptoms, your AHI, or how you look. It is why the endoscopy exists.

What it is like in practice

Implantation is an outpatient surgical procedure under general anaesthetic, typically two to three hours, with incisions at the neck and chest. Most people are home the same day.

The device is not switched on immediately — activation usually happens around a month later, once healing is complete. Then follows a period of adjustment, where the stimulation level is tuned during follow-up visits and often a repeat sleep study. Getting the setting right takes time, and the first setting is rarely the final one.

Common experiences include tongue soreness and a sensation of the tongue moving that takes getting used to, temporary tongue weakness, and discomfort at the incision sites. Battery life runs to roughly a decade, after which the generator is replaced in a smaller procedure.

Honest limitations

It is surgery. Reversible in the sense that the device can be removed or switched off, but you have had an operation and there is hardware in your chest.

It is not a cure. Success in the literature is generally defined as a substantial reduction in AHI rather than elimination, and a proportion of implanted patients do not achieve it. Ask your surgeon for their own outcome data.

MRI compatibility has conditions. Modern systems allow scanning under specified conditions; confirm the specifics for your device.

CPAP, used properly, remains more effective for most people. The case for stimulation is not that it beats CPAP on the numbers — it is that a therapy you actually use every night beats a superior therapy sitting unused in a cupboard. If your CPAP problem is fixable, fix it first: mask fit, pressure settings and mouth leak account for a large share of abandonment, and all three are solvable.

Where it fits

For someone with moderate-to-severe apnea who has genuinely tried CPAP, worked through the mask and pressure problems with their provider, and still cannot sleep with it, this is a real and well-evidenced option that did not exist a generation ago.

For everyone else — and particularly for anyone whose complaint is noise rather than a diagnosis — it is the wrong end of a long list. The full range of surgical options, and everything reversible to try first.