Patent ID: 6786365
Filing Date: 2004-09-07
Classification: A61M

Abstract:
A liquid supply apparatus, comprising:a cylinder having an interior space, a head portion and a rear portion, the head portion having a liquid-flow opening; a piston located in the interior space of the cylinder and air-tightly partitioning the interior space into a liquid compartment on the side of head portion and a gas compartment on the side of the rear portion; a gas supply apparatus configured to be coupled to the rear portion and to supply a gas into the gas compartment, the gas supply apparatus comprising: a liquid material configured to be used to generate the gas, and a gas separating structure configured to separate the generated gas from the liquid, the gas separating structure comprising a liquid-impermeable-but-gas-permeable sheet in contact with the liquid material; and wherein the piston is configured to move toward the head portion when the gas is supplied to the gas compartment.