Intravenous alarm device
US4198626A · kind A · utility
Inventor
Key dates
| Filing date | Sep 2, 1977 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Sep 2, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An intravenous alarm device provides an alarm signal to indicate that a predetermined amount of liquid remains in a liquid dispensing container of the type such as an I.V. bottle or bag adapted to be suspended from an arm. The device includes an attitude-sensitive transducer such as a mercury switch defining a reference axis, and the alarm signal is given when the reference axis extends along a line in predetermined angular relationship with the horizontal. The device further includes a structure supporting the transducer, with the structure including, at a first point thereof, a hanger portion to suspend the device from such an arm; at a second point thereof, a holding portion to suspend the container from the device; and, at a third point thereof, a device center of gravity. The first, second, and third points are spaced to define vertices of a triangle. In use, the structure orients the reference axis at an angle relative to the horizontal with the instantaneous angle being dependent upon the weight of the liquid remaining in the suspended liquid container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.