FLUID FLOW RATE CONTROLLER FOR INHALING ANESTHETIC DEVICE AND INHALING ANESTHETIC DEVICE

摘要

A flow control device for inhalation anaesthesia apparatus, the control device being connectable between a co-axial tube system and a face mask or the like and having a jet whereby exhaled gases are preferentially directed into an inner supply tube of the co-axial system. The control device has a body member in which the jet is removably secured and to which an outer connecting member is connectable. A further inner connecting member is located within the outer connecting member and is secured thereto by vanes. There is a space between the inner connecting member and the body member so that there is fluid communication between the interior of the inner connecting member and the annular space between it and the outer connecting member. The inner tube of the co-axial system is connected to the inner connecting member and the outer tube to the outer connecting member. A rebreathing bag with a control valve is located at the end of the inner tube remote from the control device and a port to which a venting control valve or a ventilating mechanism may be connected is provided at the corresponding end of the outer tube. With the control device of the invention it is possible to change from a Mapleson-'A'-like system to a modified Mapleson-'D' or 'E' system, and vice versa, with ease and safety with significantly lower gas flow rates with spontaneous breathing.