A rate meter for use with an IV fluid administration system having a vertical transparent drip chamber, the rate meter having an elongated housing having a notch therein for receiving the drip chamber, and a spring bias moveable portion which engages the drip chamber so that the housing is held to the...http://www.google.es/patents/US5002539?utm_source=gb-gplus-sharePatente US5002539 - IV rate meter
