Peripheral Nerve Stimulation in St. Louis

Spinal cord stimulation covers pain across a wide area. Peripheral nerve stimulation targets one nerve. It suits pain in one spot that can be traced to one nerve. Examples are pain after a nerve injury, a pinched nerve that still hurts after release surgery, or a painful nerve in the shoulder, knee, foot or trunk. The more exactly the pain maps to one nerve, the better this tends to work.

Related reading: Electroanalgesia (TENS and PENS)

Aim matters more here than in almost any other procedure we offer. Electrodiagnostic testing and diagnostic nerve blocks confirm which nerve is causing the pain before any lead goes in. A block that stops the pain every time is strong evidence that stimulating that nerve will help.

A thin lead is placed next to the target nerve using live imaging. We use both ultrasound and fluoroscopy, and prefer fluoroscopy where we have it. Ultrasound shows the nerve, the blood vessels nearby and the lead in real time as it moves in. Fluoroscopy records the final lead spot against the bones. That record is what any later check or revision is read against. No sedation is used, so what you tell us during placement guides where the lead ends up. As with spinal cord stimulation, a trial comes before any permanent system.

You are awake for the procedure and go home the same day. It usually takes under an hour. Some systems are built to run for a set number of weeks, not to stay in for good. That suits patients who want to avoid a long-term device. We talk through which type fits you before booking.

Peripheral nerve stimulation works the same way as spinal cord stimulation, but closer to the source. Current turns on the large, coated (myelinated) nerve fibers first. They fire more easily than the small, bare C fibers that carry most chronic pain. When the large fibers fire, they wake up brake cells in the dorsal horn of the spinal cord. Those brakes quiet the signal from the small fibers.

The lead sits next to one known nerve, not the spinal cord. So the effect stays in that nerve’s area. That is a weakness when pain is spread out, and a strength when it is not. There is no need to put hardware in the epidural space to treat one pinched nerve in a limb.

A key advance is the sixty-day percutaneous system. A thin lead is placed through the skin, worn for up to sixty days, then pulled out. No permanent implant is left behind. The idea is that steady stimulation may reset the oversensitive circuit, not just mask the signal while the device runs.

Published prospective studies support lasting relief in a good share of patients after the lead comes out. The RESET trial met its primary endpoint (its main goal). More patients got at least fifty percent pain relief at three months than those getting standard interventional care. The evidence is younger and smaller than for spinal cord stimulation. We present it that way, not as settled.

Auricular vagal stimulation for diabetic peripheral neuropathy

For painful diabetic peripheral neuropathy we use the NS-100, a programmable peripheral electrical nerve stimulator made by Nalu. It is an FDA-cleared Class II device.

It is applied to the auricular branches — the nerve branches at the ear — not to the nerves in the painful limb. It acts as a vagal stimulator. That is the part patients find strange. The device sits at the ear, and the pain being treated is in the feet. It works through the vagal pathway and how that pathway shapes the way pain signals are handled. It does not block the painful nerve where it hurts.

The stimulator is worn for a set time — up to 30 days, though most patients are treated for around 20. Nothing is left permanently in place.

Placement is done under local anesthetic with no sedation. You drive yourself home, and there are no activity restrictions afterward.

On coverage. Peripheral nerve stimulation is a covered category under Medicare’s national coverage determination for electrical nerve stimulators, and local coverage determinations set the criteria that apply. That is the category, not a promise about your claim: your specific plan, indication and documentation still govern, so coverage is verified before anything is scheduled. An authorization, where one is obtained, is not itself a guarantee of payment.

See diabetic peripheral neuropathy for how the condition is evaluated before this point is reached.