Patent ID: 7246723

Claim:
A pump for delivery of gas-liquid mixtures, said pump being adapted to be connected to a container for a liquid, said pump comprising: suction means adapted to be reciprocated between a first rest position and a second position so as to collect said liquid from said container; a mixing chamber in communication with said suction means so that when said suction means is moved from said first position to said second position, said liquid is collected from said container and is conveyed into said mixing chamber; elastic means outside the container and being coupled to and moveable with the suction means, said elastic means adapted to displace said suction means back to said first position after the suction means is moved from said first position to said second position; wherein said elastic means defines a variable volume gas chamber in communication with said mixing chamber so that, when said suction means is moved from said first position to said second position, said gas is conveyed into said mixing chamber, and a gas-liquid mixture is formed in said mixing chamber.