Measuring and testing – Fluid pressure gauge – Combined
Reexamination Certificate
1999-01-28
2001-07-17
Fuller, Benjamin H. (Department: 2855)
Measuring and testing
Fluid pressure gauge
Combined
C073S862391
Reexamination Certificate
active
06260416
ABSTRACT:
BACKGROUND OF THE INVENTION
For measuring the interior pressure of hoses or lumen, pressure sensors that directly impinged with or submitted to the interior pressure are known. The disadvantage of this prior art is that the medium being transported through the respective lumen or hose comes into direct contact with parts of the sensor and that the channel formed by the hose must be opened in order to connect the sensor.
The object of the invention is to present a new device that enables the simplified measuring of pressure without opening the hose or lumen.
SUMMARY OF THE INVENTION
Measuring interior pressure is to be understood according to invention among other things as the measuring with production of an analog or digital variable signal dependent on the pressure, but among other things also verification and monitoring of the interior pressure, of changes in pressure and/or of the upper and/or lower deviation from pressure values (threshold values).
The measuring and/or determination and/or acquisition of the interior pressure or of the pressure change in a hose or lumen occurs by measuring and/or acquisition of the force which the interior pressure exerts on the retainer or cage surrounding the hose. The hose or lumen is enclosed in this retainer in such a way that a deformation or change in shape of the lumen or hose or of the wall of these does not occur. For this purpose the retainer is preferably formed or adjusted in such a way that he wall of the hose or lumen is supported by the retainer for example without deformation, i.e. also especially without interior tensile stress that would stretch the material in the case of a lumen or hose with no pressure or with a low interior pressure, but also with the highest expected pressure.
The inherent elasticity of the material of the hose or lumen is insignificant for the invention, so that measuring and/or determination and/or acquisition of the interior pressure is also possible with hoses made of inflexible material, for example with an elastic-viscous hose material. Especially also changes in the elasticity of the respective hose, for example through aging etc. have no effect on the measuring result.
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Joswig Jurgen
Oswald Jens
Seifert Steffen
Aw-Musse Abdullahi
Forderverein Institut fur Medizintechnik Dresden E.V.
Fuller Benjamin H.
Hoffman Wasson & Gitler
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