Filmmaker Ravi Chopra, who is undergoing treatment in Breach Candy Hospital for lung ailment, has reportedly shown no signs of improvement. “He has been put on ventilator and there is no improvement in his health,” said a source from the hospital. The 66-year-old filmmaker, who is the nephew of late Yash Chopra, was taken to the hospital a few days ago. According to informed sources, he has been battling with lung problem for a long time. Ravi is known for directing The Burning Train (1980), Aaj Ki Awaz (1984), Baghban (2003) and Baabul (2006), among others.