Suneva Medical, Inc. is in advanced talks to go public through a merger with blank-check company Viveon Health Acquisition Corp. (NYSEAM:VHAQ), according to people with knowledge of the matter. The deal is expected to value San Diego-based Suneva at about $511 million including debt, said the people, who asked not to be identified because the information is private.

The deal is expected to be announced as soon as this week, they said. Representatives for Suneva and Viveon Health Acquisition declined to comment.