Measuring and testing – Fluid pressure gauge – With protective separator
Reexamination Certificate
2005-04-19
2005-04-19
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Fluid pressure gauge
With protective separator
C073S730000
Reexamination Certificate
active
06880404
ABSTRACT:
The aim of the invention in particular is to reduce the risk of haemolysis in extracorporeal blood circulation. To this end, a system element for releasably sealingly connecting a transducer to a fluid system comprises a measuring chamber (7) which can be connected to the fluid system in such a way as to allow throughflow. Said measuring chamber (7) is formed in a housing (10). Part of the wall of the measuring chamber (7) is formed by a membrane (11) which is considerably more flexible than the rest of the wall (15) of said measuring chamber (7). The membrane (11) has a peripheral built-up section (20) which is located on the side of the membrane (11) that faces towards the measuring chamber (7). Said built-up section (20) engages in a channel (19) which is formed in the housing (10) and which extends around the measuring chamber (7). The wall (inner wall16) of the channel (19) that faces towards the measuring chamber (7) is lower than the wall (outer wall17) of the channel (19) that faces away from the measuring chamber (7) (19). The invention also provides for a system element for releasably sealingly connecting a transducer to a fluid system, containing at least one sensor for converting pressures and pressure changes into electrical signals. The sensor is located in a housing (26) and at least part of the housing (26) is filled with a fluid or gel which transmits pressure. The housing (26) is closed by a transducer membrane (23) on one side. In the area (24) surrounding the transducer membrane (23), the housing (26) is configured for applying one of the system elements (1) according to one of the preceding claims. This surrounding area (24) essentially encompasses the transducer membrane (23) in a ring shape. The measuring range of the sensor has differential pressures of at least −250 mm Hg to +1000 mm Hg in relation to the surroundings. The invention also relates to a set comprising the inventive system elements.
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Extract from a standard text publication in the field of cardiology, Beitrage Zur Kardiologie, Band 29, author R. Buchwalsky, pp. 104-109, 1985.
Allen Andre
Baker & Daniels
Lefkowitz Edward
MHM Harzbecher Medizintechnik GmbH
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