Inspire Sleep Apnea Device: How It Works and Who Qualifies

If CPAP has not worked for you, you may have heard about a device called Inspire. It is a small implant that treats obstructive sleep apnea without a mask or a hose. Understanding how it works can help you have a more informed conversation with your doctor.

Obstructive sleep apnea happens when the airway collapses during sleep. The tongue and surrounding muscles relax and block airflow. This causes breathing to stop repeatedly throughout the night. CPAP works by pushing pressurized air through a mask to keep the airway open. But up to 60% of patients cannot tolerate it long-term.

Inspire takes a different approach. Instead of pressurizing the airway from outside, it stimulates a nerve inside the body to prevent the collapse from happening. The device targets the hypoglossal nerve, which controls tongue movement. A small electrical signal causes the tongue to stiffen and move forward, keeping the airway open during sleep.

The system has three parts. A small pulse generator is implanted under the skin of the chest. A breathing sensor is placed between the muscles of the rib cage. A stimulation lead connects to the hypoglossal nerve under the jaw. The pulse generator detects when you inhale and sends a signal to the nerve at the right moment. The patient controls the device with a small handheld remote, turning it on before sleep and off upon waking.

The device was approved by the FDA in 2014. The landmark clinical trial, known as the STAR trial, implanted 126 patients and measured results at 12 months. The median reduction in breathing disruptions was 68%. Daytime sleepiness scores improved significantly. Serious complications occurred in fewer than 2% of patients. A five-year follow-up of the same patients found that 75% maintained a durable response.

Not everyone qualifies. The current criteria require a diagnosis of moderate to severe obstructive sleep apnea, a prior CPAP trial with documented intolerance, a body mass index below 35, and an apnea-hypopnea index between 15 and 65 events per hour. Patients also undergo a procedure called drug-induced sleep endoscopy before implantation. This test confirms that the airway collapses in a pattern the device can address. Patients with a specific type of collapse pattern are not candidates.

The implant procedure takes two to three hours and is performed under general anesthesia. The device is activated about one month after surgery. Over the following three months, patients gradually increase stimulation levels at home. A follow-up sleep study is then performed to fine-tune the settings.

Inspire is not a cure and it does not work for everyone. But for patients who have tried CPAP and failed, it represents a meaningful alternative backed by consistent clinical evidence across multiple studies and institutions.