METHOD AND APPARATUS FOR PROVIDING STERILITY OF LIQUID INJECTION SYSTEMS Russian patent published in 2006 - IPC A61M5/14 

FIELD: medicine, in particular, transportation of sterile liquids by means of process and apparatus preventing creation of back liquid flow of, for example, blood products into source of sterile replacement liquid.

SUBSTANCE: apparatus has adjustable pinching valve located within pipe part along which sterile replacement liquid is fed into outer system. According to one of embodiments, method involves adjusting valve by means of control unit on the basis of liquid pressure above and below said valve, pressure values being obtained respectively by means of pressure sensor positioned upstream of liquid flow and pressure sensor positioned downstream of liquid flow. Valve is preferably opened only when pressure downstream of liquid flow exceeds pressure upstream of liquid flow. This allows replacement liquid to flow only in one direction when pinching valve is in closed position to provide for full closing of pipe. The result is that blood will not contaminate sterile liquid because blood will not get into pipe in case of pressure fluctuations.

EFFECT: increased efficiency by providing repeated employment of replacement liquid feeding system.

22 cl, 3 dwg