The invention relates to a unidirectional valve appliance, in particular a low pressure check valve for use for an infusion comprising a housing with an inlet and an outlet, and with at least one gasket in a pressure chamber. To prevent air entry into the infusion fluid circuit, the appliance includes...http://www.google.fr/patents/US6932110?utm_source=gb-gplus-shareBrevet US6932110 - Unidirectional valve appliance
