Patent ID: 8343102
Filing Date: 2013-01-01
Classification: A61B,A61M

Abstract:
1. A medical fluid injector for use in an MRI procedure comprising: a pneumatic working medium supply; a cylinder; a piston disposed within said cylinder; a pneumatic working medium within said cylinder on a first side of said piston, wherein said pneumatic working medium supply is connectable with said cylinder on said first side of said piston; a liquid within said cylinder on a second side of said piston opposite of said first side, wherein a substantially non-ferrous and substantially non-magnetic fluid drive that is configured to not interfere with magnetic resonance imaging comprises said cylinder, said piston, said pneumatic working medium within said cylinder on said first side of said piston, and said liquid within said cylinder on said second side of said piston; a liquid reservoir connectable with said cylinder on said second side of said piston; a first valve between said liquid reservoir and said cylinder on said second side of said piston; a pump located between said liquid reservoir and said cylinder on said second side of said piston, and configured to force liquid to flow between said cylinder on said second side of said piston and said liquid reservoir; and a ram coupled to said piston, wherein said pneumatic working medium on said first side of said piston moves said piston in an injection direction to move said ram as said liquid within said cylinder on said second side of said piston opposes movement of said piston.