Patent ID: 7156227

Claim:
A system for mixing at least two products, the system comprising: a first container for containing at least a first product, the first container comprising a first opening, a first coupler, a neck, a hollow shaft located within the neck, and a blunt safety member; a second container for containing at least a second product, the second container comprising a second opening, a seal closing the second opening, and a second coupler configured to engage with the first coupler; and a perforating member configured to pierce the seal closing the second opening, wherein the safety member is configured to press against the seal while the seal maintains closure of the second opening, wherein the first opening is not completely obstructed by the safety member, wherein the safety member extends through the first opening, wherein the hollow shaft defines the first opening and the first coupler is located on the hollow shaft, and wherein the hollow shaft is connected to the neck via a connecting element and the connecting element comprises at least one vent orifice for allowing air to escape during mixing of the first and second products.