A subsidiary of UnitedHealth Group Inc. has acquired ChinaGate, a firm that helps drug, device and biotech companies enter the Chinese market, the companies said Wednesday.

I3, a company owned by Minnetonka-based UnitedHealth's technology arm, Ingenix, bought Shanghai-based ChinaGate for an undisclosed sum.

The companies said ChinaGate has extensive experience with the State Food and Drug Administration, China's version of the U.S. Food and Drug Administration, and has helped bring more than 450 medical and consumer health products into the Chinese market.

ChinaGate has also helped clients sell Chinese-made products globally.