Intuitive Surgical Inc. said Monday the California Institute of Technology filed a patent infringement lawsuit against the company in the U.S. District Court for the Eastern District of Texas.

The Sunnyvale, Calif.-based medical equipment manufacturer said the lawsuit is without merit and has filed an action in the U.S. District Court for the Northern District of California seeking declaration that the company isn't infringing Cal Tech patents.

Intuitive Surgical shares fell $2.88, or 3.06 percent, to close at $91.20 on the Nasdaq Stock Market Monday.