An aspiration assembly having dual co-axial check valves for pumping medical fluids with a hypodermic syringe, the assembly having a main body with two passageways in offset relationship to each other, with the passageways coming together at a large central cavity within the main body, a central support...http://www.google.fr/patents/US4729401?utm_source=gb-gplus-shareBrevet US4729401 - Aspiration assembly having dual co-axial check valves
Aspiration assembly having dual co-axial check valves
