Few medical devices hold as much potential for explosive growth as spinal-cord stimulators, especially in the United States, where they are being pushed as the answer to the country’s opioid epidemic.

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The global market for spinal-cord stimulators has grown from $300 million in 2001 to nearly $2 billion in 2017, according to an estimate by Nevro, a Redwood City, California, company that manufactures the devices.