"If so, what type of product or concentration of cannabis is helpful?"
Cannabis can be helpful for carpal tunnel syndrome. It will help treat the pain, inflammation and spasms. Inflammtion of the median nerve, often caused by repetitive movements is usually the underlying cause of this common condition. I would try a topical cannabis product as well as a CBD rich whole plant tincture extract. Many different strengths and formulations are available and you should experiment to see what works best for you.