INSTICKSNAL FOR INFUSIONS- OCH TRANSFUSIONSAPPARATER

摘要

A piercing cannula of infusion and transfusion instruments, includes a housing having a lower liquid chamber defined therein and having an upper closure with an air opening on one side. A liquid member communicating with the interior of the housing extends outwardly through the closure directly alongside an aeration channel which has a lower end communicating with the opening. The housing includes a tubular portion defining an air inlet passage from the opening to the lower end of the aeration channel and a valve member is disposed between the liquid chamber and the lower end of the open aeration channel. The valve member comprises an upper inwardly tapered portion which is resiliently biased against the end of the tubular part defining the air passage.