The Inspire implant is roughly the size of a cardiac pacemaker. The pulse generator, which is the main body of the device, measures about 46 to 52 mm tall (around 2 inches), 51 to 60 mm long (about 2 to 2.4 inches), and 8.4 to 10 mm thick (roughly a third of an inch). That puts it in the ballpark of a small matchbox or a stack of three coins.
Those dimensions come from FDA documentation covering different Inspire generator models. The newer Model 3028 is the smaller of the two, while older models run slightly larger. Either way, the generator is a flat, rounded rectangle designed to sit under the skin of your upper chest without creating a major bulge.
What the Full System Looks Like
The generator is only one piece. The complete Inspire system has three components that are all placed during a single surgery. The pulse generator goes under the skin below your right collarbone. A stimulation lead runs from the generator up to the nerve that controls your tongue. A sensing lead extends down to the area between your ribs, where it detects your breathing pattern. The generator uses signals from the sensing lead to time a gentle pulse to the tongue nerve each time you inhale, keeping your airway open while you sleep.
The two leads are thin, flexible wires. While exact diameter specs aren’t publicly listed in the implant manuals, they’re similar in scale to the leads used in pacemakers: narrow enough to be tunneled under the skin between the incision sites without a separate large opening.
Where It Sits in Your Body
The generator is placed in a pocket created just beneath the skin, about 2 to 3 cm below the right collarbone. Surgeons position it so that normal arm movements throughout the day won’t push the device up onto the bone. The generator is implanted with its logo side facing the skin, which helps your care team locate it later for programming adjustments or battery checks.
Because the device is thin (under half an inch at its thickest), most people find it relatively unobtrusive once healing is complete. Leaner individuals may notice a slight outline under the skin, similar to what pacemaker patients experience. It won’t be visible through clothing for the vast majority of people.
Incisions and Scarring
The surgery typically involves two or three small incisions. The primary incision below the collarbone is about 5 to 6 cm long (roughly 2 to 2.5 inches) to create the pocket for the generator and allow the leads to be connected. Additional smaller incisions are made under the chin and along the ribcage to position the stimulation and sensing leads.
Surgeons are advised to place incisions along natural skin creases to minimize visible scarring. The procedure is done under general anesthesia as an outpatient surgery, and most patients go home the same day. The incision sites heal over the following weeks, and the scars typically fade over several months.
How It Compares to Other Implants
If you’ve ever seen a cardiac pacemaker, the Inspire generator is comparable in both size and shape. Mayo Clinic describes the two as “similar in size and appearance.” That comparison is useful because pacemakers have been implanted for decades, and the surgical approach for placing the Inspire generator follows a very similar technique: a small pocket under the collarbone skin, with thin leads running to their target locations.
Compared to a CPAP machine sitting on your nightstand, the implant is obviously far smaller and completely internal. There’s no mask, no hose, and no external equipment aside from a small handheld remote you use to turn the device on before bed and off when you wake up. The latest versions of the generator are also MRI compatible, which means you won’t face restrictions if you need imaging down the road.
Battery Life and Replacement
The generator runs on an internal battery that lasts approximately 11 years, depending on your usage settings. When the battery eventually runs low, only the generator needs to be replaced through a minor procedure. The leads are designed to stay in place long term and typically don’t need to be swapped out during a battery replacement. The replacement generator is implanted in the same pocket, so no new incision site is needed.