| 摘要 |
<p>A metering apparatus and system for controlling the administration of IV fluids having a valve housing (14, 60, 102, 202, 302, 505, 602) with a valving chamber therein. A rotatable valve body member (40, 80, 125, 220, 322, 502, 618) is positioned within the valve chamber and a valve passageway of variable cross-sectional area is provided at either the chamber (330) or on the valve member (64, 90, 140, 242, 509, 620). The effective area and length of the valve passageway interposed between the inlet and outlet to the valve is adjustable to regulate flow by moving the valve body relative to the valve member. Various accessories can be selectively attached to the basic valve configuration including a backplate (150, 510) which facilitates single-handed operation and an optional cover plate (550) which may be secured to the backplate (510) to provide security from patient tampering. In the preferred embodiment the valve housing and internal valve members are fabricated from dissimilar plastic materials of different hardness to improve the sealing therebetween.</p> |
