Medical valve with positive flow characteristics

The invention claims a valve, which is used for with the so the liquid flows the first and second medical device. The valve is a belt interface shell, the interface is suitable for connecting the first medical device according to catheter's peak connection; the valve is also provided with a sealing of the flexible material is. The seal's first end and interface connected, the second end is suitable for connecting the second medical device; the sealing at least provided with a first end and second end communicated edge. The is at settlement state, the edge is formed restrictive the liquid circuit and a relatively small inner bottom; The second medical device introduction edge, the edge formed with a liquid expanded circuit and oppositely the inner intervals; volumeThe second medical device of sealing withdrawing, the edge and forms the restrictive liquid circuit and a relatively small inner volume.