Abstract: A medical device which is manually operable to draw a vacuum using a piston and cylinder combination may be used for creating a vacuum in the cup of a birth extraction device or to withdraw fluids from a body cavity or perform biopsies with a hollow needle. The structure includes a closed loop at the remote end of the cylinder which allows the device to be manipulated by one hand and it may include check valves to prevent any fluid withdrawn from the body from being reinjected into the body cavity or vessel by location of check valves in a withdrawal duct and a drainage port. The same device may be used for injecting fluids into a body cavity and may include structure between the loop and cylinder to apply force to the piston to discharge fluids through a needle attached to the remote end of the cylinder.

Abstract: A medical device which is manually operable to draw a vacuum using a piston and cylinder combination may be used for creating a vacuum in the cup of a birth extraction device or to withdraw fluids from a body cavity or perform biopsies. The structure includes a closed loop at the remote end of the cylinder which allows the device to be manipulated by one hand and it may include check valves to prevent any fluid withdrawn from the body from being reinjected into the body cavity or vessel by location of check valves in a withdrawal duct and a drainage port. The same device may be used for injecting fluids into a body cavity and may include structure between the loop and cylinder to apply force to the piston to discharge fluids through a needle attached to the remote end of the cylinder.