Microfluidic flow cell having a storage space that holds liquid reagent material and/or sample material

1. A microfluidic flow cell, comprising: a storage space in which a liquid reagent material and/or liquid sample material is stored; an inlet channel connected to the storage space for guiding a liquid to the storage space to transport the liquid reagent material and/or liquid sample material out of the storage space; an outlet channel connected to the storage space for receiving the liquid together with the liquid reagent material and/or liquid sample material; and a bypass that connects the inlet channel and the outlet channel and bypasses the storage space, wherein the bypass directly branches upstream of the storage space, the storage space forming a channel portion in alignment with the inlet channel and to the outlet channel, wherein, perpendicular to a direction of flow, the channel portion has a cross-section that is equal to or smaller than a respective cross-section of the inlet channel and the outlet channel, and wherein the channel portion is at least partially hydrophilized so as to hold the liquid reagent material and/or liquid sample material within the storage space.

2. The flow cell according to claim 1 , wherein the bypass branches off from the inlet channel directly upstream from the storage space in a direction of flow.

3. The flow cell according to claim 1 , wherein the storage space has a cross section perpendicular to a direction of flow that corresponds to a cross section of the inlet channel and/or a cross section of the outlet channel.

4. The flow cell according to claim 1 , wherein the storage space has a cross section perpendicular to a direction of flow that is constant in a direction of flow.

5. The flow cell according to claim 1 , wherein the bypass has a flow cross section dimensioned so that a desired fraction of fluid flowing in through the inlet channel flows via the bypass.

6. The flow cell according to claim 1 , wherein the bypass has a flow cross section just sufficient to vent the inlet channel in order to prevent reagent material and/or sample material from being transported out of the storage space by air pressure rising in the inlet channel.

7. The flow cell according to claim 1 , further comprising a flexible cover film bordering the storage space, wherein the bypass is formed by deflection of the flexible cover film bordering the storage space.

8. The flow cell according to claim 7 , wherein the cover film is deflected by air pressure in the inlet channel or by suction pressure generated from outside by an operator device.

9. The flow cell according to claim 1 , wherein the inlet channel, the outlet channel and optionally the storage space are formed by recesses in a substrate, and the recesses are closed in a fluid-tight manner by a cover connected to the substrate.

10. The flow cell according to claim 9 , wherein the cover is a cover film welded and/or adhesively bonded to a panel face of the substrate.

11. The flow cell according to claim 9 , wherein the storage space is adjoined by a carrier element that receives the liquid reagent material and/or sample material and which, in order to close the storage space in a fluid-tight manner, is insertable into an opening in the substrate and is connectable in a fluid-tight manner to the substrate.

12. The flow cell according to claim 11 , wherein the storage space is bordered by a receiving region of the carrier element for the reagent material and/or sample material, which receiving region is formed in an endpiece of a plug-like carrier element.

13. The flow cell according to claim 12 , wherein the bypass extends between the endpiece and an inner wall of the opening.