Patent ID: 7670326

Claim:
A syringe adapter element for use in a drug mixing system comprising: a housing element having a syringe port adapted for fluid connection with a syringe and a fluid port adapted for fluid connection with a fluid flow adapter element; a needle and at least one septum disposed in said housing element, said needle having a sealed orientation wherein said at least one septum blocks fluid flow through said needle and a fluid flow orientation wherein said needle punctures said at least one septum so as to permit fluid to flow through said needle; and an anti-separation device adjacent said fluid port, such that when said syringe adapter element is connected to a fluid flow adapter element, said anti-separation device applies a force that acts against separating said syringe adapter element from the fluid flow adapter element, wherein said anti-separation device comprises a ring member with a plurality of resilient leaves disposed inside a keeper element, said keeper element having a first bore sized to prevent outward expansion of said resilient leaves and a second bore, larger than the first bore, sized to permit outward expansion of said resilient leaves, said resilient leaves being adapted to resiliently fasten onto a fluid flow adapter element, said anti-separation device having first and second positions, wherein in the first position, said resilient leaves are positioned in said first bore and are adapted to hold onto the fluid flow adapter element, and in the second position, said resilient leaves are positioned in said second bore and are adapted to expand outward to release the fluid flow adapter element, and wherein said resilient leaves move together with said fluid flow adapter element with respect to said syringe adapter element.