Patent ID: 6176869
Filing Date: 2001-01-23
Classification: A61F

Abstract:
A drive mechanism for a therapeutic treatment system comprising:a treatment fluid storage vessel;a drive fluid pump;a pressurizing chamber for conveying a stored treatment fluid, said pressurizing chamber having a drive fluid inlet for receiving a pressurized drive fluid from said drive fluid pump, a treatment fluid inlet for receiving said stored treatment fluid from said treatment fluid storage vessel, a treatment fluid outlet for discharging said stored treatment fluid, and a drive fluid outlet for discharging said drive fluid; anda drive fluid outlet valve having an open position and a closed position to selectively control discharge of said drive fluid from said pressurizing chamber via said drive fluid outlet, wherein said drive fluid outlet valve automatically transitions to said open position to discharge said drive fluid via said drive fluid outlet in response to a substantial volume decrease of said stored treatment fluid in said pressurizing chamber and automatically transitions to said closed position to block discharge of said drive fluid via said drive fluid outlet in response to a substantial volume increase of said stored treatment fluid in said pressurizing chamber.