Apparatus for indicating fluid pressure within a conduit
US5721382A · kind A · utility
Inventors
Key dates
| Filing date | Sep 24, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Sep 24, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2209/045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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 disposed in an overlaying relationship. These films are shifted relative to each other by movement of mechanical actuators which are deflected solely by the pressure of the fluid within the fluid conduits 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.