Control valve

摘要

A patient suction catheter system has a patient coupling 29, a catheter 24 surrounded by a sterility preserving collapsible envelope 25 and a vaccuum control valve mechanism 10 for regulating the application of vacuum or suction through the catheter. The catheter 24 and surrounding envelope 25 extend between the coupling 29 and the control valve mechanism 10. The control valve mechanism 10 is normally closed and is biased toward the closed position by a resilient cap 19 formed integrally with the valve closure 10a. Air trapped in the valve bore 13 beneath the valve stem 14 also biasses the valve to the closed position.