Corindus Vascular Robotics Inc. has added about $4.8 million to the final tally of a previously announced private placement after select existing investors purchased additional shares.

Waltham, Mass.-based Corindus, a developer of vascular robotics, closed a private placement of common shares that raised approximately $14.8 million in February. The company said in a March 12 release that an additional closing has since been held, and 3,512,124 additional shares were purchased by existing investors at the original placement price of $1.38 apiece and under the same terms.

The extra closing has brought the final tally of the placement to about $19.5 million, according to Corindus. Funds from the placement are to be used for general corporate purposes.

Investors participating in the additional closing include Hudson Executive Capital LP and BioStar Ventures LLC.