Flow cell comprising a storage zone and a duct that can be opened at a predetermined breaking point
A flow cell having at least one storage zone connected to a duct for conducting fluid out of, into or/and through the storage zone. The duct includes a duct section which is delimited by a substrate and a film joined to the substrate and in which the duct is sealed and can be opened at a predetermined breaking point by deflecting the film. The film covers a recess in the substrate which forms the duct section. A sealing wall that seals the duct and is integrally joined to the substrate is placed in the recess. The predetermined breaking point is formed by a breakable joining region between the film and an edge portion of the sealing wall facing the film. The dimensions of a peripheral area of the sealing wall which is formed in the edge portion and runs parallel to the film determine the surface area of the joining region.
1. A flow cell, comprising: a storage chamber that is partially filled with a liquid fluid up to a fluid level and in which a pressurizable gas is enclosed above the fluid level directly bordering the gas; a pipeline that projects into the storage chamber and extends into the liquid fluid through the fluid level with a first end; a duct connected to a second end of the pipeline by an end of the duct without an extension of the duct beyond the connection, wherein the duct and the second end are arranged above the fluid level; and a barrier web that closes off the duct, the pipeline and the storage chamber.
2. The flow cell according to claim 1 , wherein the barrier web has a predetermined breaking point, the duct and the pipeline being arranged so that after rupture of the predetermined breaking point a further fluid or a compressed gas is introducible into the storage chamber by compressing the pressurized gas enclosed above the fluid level.
3. The flow cell according to claim 2 , wherein the fluid is a reagent and the further fluid is a specimen fluid.
4. The flow cell according to claim 1 , further comprising: a further duct closed by a further barrier web; and a passage that opens into the storage chamber above fluid level of the fluid and is connected to the further duct.
5. The flow cell according to claim 4 , wherein the further duct is configured to apply a compressed gas.
6. The fuel cell according to claim 1 , further comprising a filling duct that opens into the storage chamber, the filling duct being closable after filling of the storage chamber.
7. The flow cell according to claim 1 , wherein the storage chamber is formed by and elastically deformable film.