Why the splint isn't enough
Inside your wrist, the median nerve is being starved of oxygen. Swollen tissue is pressing on the blood vessels that feed it. No blood flow means no oxygen. No oxygen means tingling, numbness, and pain.
A splint holds the wrist still. It doesn't open the blood vessels. Painkillers mask the sensation. Cortisone calms inflammation for a few weeks before it returns.
None of them get oxygen back to the nerve. NerveEase does.