Flow cell with a temperature-control chamber

1. A flow cell with a temperature-control chamber for holding a fluid, the temperature of which is to be controlled, a boundary wall of the chamber being formed at least partially by a thin composite foil for transferring heat between a temperature-control element and the fluid, wherein the temperature control element is arranged on a surface of the composite foil that faces away from the fluid, wherein the foil composite has several layers joined with one another, wherein a layer that faces the fluid is a plastic layer and is the only one of several layers that contacts the fluid, and wherein at least one other layer is a metal.

2. The flow cell in accordance with claim 1 , wherein the plastic layer that faces the fluid is a plastic that is compatible with an amplification reaction.

3. The flow cell in accordance with claim 2 , wherein the plastic is an olefin polymer.

4. The flow cell in accordance with claim 3 , wherein the plastic is one of PP, PE, COC or PC.

5. The flow cell in accordance with claim 1 , wherein the at least one metal layer consists of aluminum or a magnetizable metal.

6. The flow cell in accordance with claim 1 , wherein the foil layers include a plastic layer that faces the temperature-control element.

7. The flow cell in accordance with claim 6 , wherein the layer that faces the temperature-control element is of the same plastic as the layer that faces the fluid.

8. The flow cell in accordance with claim 1 , wherein each of the layers of the foil has a thickness of 1 μm to 100 μm.

9. The flow cell in accordance with claim 1 , wherein the temperature-control chamber is formed by a recess in a substrate and the composite foil that covers the recess, the composite foil being joined with the substrate.

10. The flow cell in accordance with claim 1 , comprising at least one valve arranged to close the temperature-control chamber, and a valve seat, against which the composite foil lies loosely, is formed in a channel that is connected with the temperature-control chamber and is covered by the composite foil.

11. The flow cell in accordance with claim 9 , wherein the substrate consists of the same plastic as the layer of the composite foil that faces the fluid.

12. The flow cell in accordance with claim 9 , wherein the temperature-control element has a solid temperature-control body placeable against the composite foil to allow heat transfer or has a temperature-control fluid that flows parallel to and wets the composite foil.

13. The flow cell in accordance with claim 12 , wherein the temperature-control element is placed only in a peripheral area which is adjacent to the temperature-control chamber and in which the composite film foil is joined with a surface of the substrate.

14. The flow cell in accordance with claim 1 , wherein the composite foil is expandable into the temperature-control chamber by the temperature-control element, as far as a stop that limits the expansion.

15. The flow cell in accordance with claim 1 , wherein the temperature-control chamber is a reservoir and at least one seal is provided that seals the reservoir and forms a break point for forming an opening.

16. The flow cell in accordance with claim 1 , wherein the composite foil is shaped to increase surface area in contact with the fluid.

17. The flow cell in accordance with claim 1 , wherein the composite foil is provided so as to perform at least one other function within the flow cell, wherein the other function is a covering function and/or a valve function.

18. The flow cell in accordance with claim 1 , wherein the chamber has an inlet and an outlet for the fluid to allow the fluid to pass through the chamber during a temperature-control process.

19. The flow cell in accordance with claim 9 , wherein the composite foil is joined to the substrate by welding or adhesive bonding.