| 摘要 |
<p>This invention is an apparatus for visually indicating fluid flow through a fluid system or apparatus such as a medical infusion device. The apparatus comprises a pair of thin, indicia bearing films (26 and 28) disposed in an overlaying relationship. These films are shifted relative to each other by movement of mechanical actuators (44 and 46) which are deflected solely by pressure of the fluid within the fluid conduits (16 and 18) of the system of the apparatus. The two films are stacked in closed proximity and are preferably constructed from a substantially transparent flexible material such as mylar. One surface of the inferior film is printed with a plurality of integrated symbols depicting various fluid flow conditions. The superior film functions as a mask over the inferior film and is printed with a pattern of diagonally extending, alternating clear and opaque stripes. The print ratio of the superior film permits viewing at any one time of only one of the symbols printed on the inferior film.</p> |
