What is a mohan veena?

The mohan veena is a form of Indian slide guitar created by Vishwa Mohan Bhatt, a disciple of Ravi Shankar, who added drone and sympathetic strings to a guitar. It carries about 19 to 21 strings: three or four melody strings, four or five chikari and 12 sympathetic strings tuned from the side of the neck, with a gourd behind the neck. Sources disagree on the guitar he started from.