Flow cell having a reagent reservoir

1. A flow cell, comprising: a carrier element that delimits a first reservoir region containing a liquid reagent, the carrier element being introduced jointly with the reagent into an opening in the flow cell; and a supplying transport channel and a discharging transport channel fluidically connected to the first reservoir region, wherein the carrier element bodily fills the opening so that a peripheral surface of the carrier element is in contact with an inner surface of the opening so that only the carrier element closes off the first reservoir region to the outside in a fluid-tight manner and has a vessel and/or capillary structure with a groove or channel that holds the liquid reagent on the carrier element, and wherein the groove or channel is aligned straight in a flow stream of the supplying and the discharging transport channels to permit a rinsing flow through the first reservoir region.

2. The flow cell according to claim 1 , wherein the first reservoir region is hermetically closed off against a cavity within the flow cell by at least one predetermined breaking point barrier.

3. The flow cell according to claim 1 , wherein the carrier element is connected to the flow cell solely by force closure and/or form closure, and/or is welded and/or bonded to the flow cell in a connecting region arranged at a distance from the reagent.

4. The flow cell according to claim 1 , wherein the carrier element is configured as a stopper filling the opening and comprising a front side having the vessel and/or capillary structure, and has a conical portion.

5. The flow cell according to claim 1 , wherein the carrier element, on an outer side facing away from the first reservoir region, has handling devices.

6. The flow cell according to claim 5 , wherein the handling devices include a seat for a connection tool.

7. The flow cell according to claim 1 , further comprising a second reservoir region that holds a fluid which rinses off the reagent, the second reservoir region being arranged upstream of the first reservoir region in a direction of flow of the fluid which rinses off the reagent.

8. The flow cell according to claim 7 , further comprising, downstream of the first reservoir region in a direction of flow of the fluid which rinses off the reagent, a closed and/or closable mixing region and a pressure source that conveys the fluid with the rinsed-off reagent into the mixing region, accompanied by a build-up of a counterpressure in the mixing region.

9. The flow cell according to claim 8 , wherein pressure of the pressure source, as the fluid with the rinsed-off reagent moves back and forth between the pressure source and the mixing region, is variable.

10. The flow cell according to claim 1 , wherein the supplying transport channel leading toward the first reservoir region and the discharging transport channel leading away from the first reservoir region are connected by a bypass that circumvents the first reservoir region.

11. The flow cell according to claim 1 , wherein the first reservoir region has a flow cross section that is smaller than a flow cross section of the transport channel leading toward and/or leading away from the first reservoir region.

12. The flow cell according to claim 10 , wherein the bypass has a flow cross section that is larger than a flow cross section of the first reservoir region.

13. The flow cell according to claim 12 , wherein the reagent, with a free liquid surface, adjoins an interior of a mixing chamber formed in the flow cell.

14. The flow cell according to claim 1 , wherein at least the vessel and/or capillary structure of the carrier element has at least in part a hydrophilized surface region.