Device and method for extracting a smear sample

1. A device for extracting a smear sample, comprising:

a cavity, into which a sample carrier carrying a smear sample is introducible, wherein at least one holding part is arranged in the cavity, the holding part including at least one recess acutely converging essentially in an insertion direction of the sample carrier;

at least one liquid feed connected to the cavity, through which liquid is introducible into the cavity;

at least one liquid discharge connected to the cavity, through which liquid is removable from the cavity; and

an interface to a microfluidic system, into which liquid is transferable.

2. The device as claimed in claim 1 , wherein at least one of the at least one liquid feed and the at least one liquid discharge comprises at least one microchannel.

3. The device as claimed in claim 1 , wherein the cavity comprises a reception opening configured to receive the sample carrier and a stopper, the reception opening being liquid-tightly sealable using the stopper.

4. The device as claimed in claim 3 , wherein the reception opening is germ-tightly sealable by the stopper.

5. The device as claimed in claim 3 , wherein the stopper is configured to automatically seal the cavity after the sample carrier is introduced to the cavity.

6. The device as claimed in claim 1 , wherein the liquid feed comprises at least one liquid reservoir, connectible at least temporarily to the cavity and from which, when it is connected to the cavity, a liquid held in the liquid reservoir is introducible into the cavity.

7. The device as claimed in claim 6 , wherein the liquid consists of distilled water, to which substances that assist release of the smear sample from the sample carrier are added.

8. The device as claimed in claim 1 , wherein the cavity comprises an inlet opening and an outlet opening, via which the liquid feed and the liquid discharge are respectively fluidly connected to the cavity.

9. The device as claimed in claim 8 , wherein the inlet opening and the outlet opening are arranged so that, when the sample carrier is introduced, a maximally large section of the sample carrier lies between the inlet opening and the outlet opening.

10. The device as claimed in claim 8 , wherein the cavity is matched to a shape and size of the sample carrier so that, when the sample carrier is introduced into the cavity, between a wall of the cavity and the sample carrier there is a spacing dimensioned such that liquid is transportable past the sample carrier from the inlet opening to the outlet opening.

11. The device as claimed in claim 1 , wherein

the holding part is essentially shaped to correspond to at least a part of the sample carrier and the sample carrier is insertable into the holding part, the holding part having a spacing from the wall of the cavity dimensioned so that liquid can travel from the inlet opening to the outlet opening, and

the holding part comprises openings which facilitate contact between the liquid and the sample carrier, when the sample carrier is inserted into the holding part.

12. The device as claimed in claim 1 , wherein the holding part comprises a sieve-like structure.

13. The device as claimed in claim 1 , wherein the cavity includes a reception opening, and

the holding part is arranged in a region of the reception opening and is configured to prevent parts of the sample carrier, which carry the smear sample, from being removed from the cavity.

14. The device as claimed in claim 8 , wherein the cavity is matched to a shape and size of the sample carrier so that, when the sample carrier is introduced into the cavity, between a wall of the cavity and the sample carrier there is a spacing dimensioned such that the liquid can travel from the inlet opening to the outlet opening only by passing through the sample carrier.

15. The device as claimed in claim 8 , wherein the cavity has a tapering shape in the region of the outlet opening.

16. A device for extracting a smear sample, comprising:

a cavity, into which a sample carrier carrying a smear sample is introducible;

at least one liquid feed connected to the cavity, through which liquid is introducible into the cavity;

at least one liquid discharge connected to the cavity, through which liquid is removable from the cavity. wherein the cavity includes an outlet opening via which the liquid discharge is fluidly connected to the cavity;

an interface to a microfluidic system, into which liquid is transferable; and

a separating unit, which subdivides the cavity into at least two sub-cavities, arranged in the cavity,

wherein each of the sub-cavities includes an inlet opening, connected to the liquid feed,

a reception opening of the cavity and the outlet opening are in different sub-cavities,

the separating unit includes an access opening, through which the sample carrier is introduced at least partially into the sub-cavity with the outlet opening.

17. The device as claimed in claim 8 , wherein the outlet opening is connectible outside the cavity selectively to at least one of the inlet opening and the liquid discharge.

18. The device as claimed in claim 17 , wherein the outlet opening is connected to a channel system, the channel system comprising at least one valve via which the outlet opening is selectively connectible to at least one of the inlet opening and the liquid discharge.

19. A device for extracting a smear sample, comprising:

a cavity, into which a sample carrier carrying a smear sample is introducible;

at least one liquid feed connected to the cavity, through which liquid is introducible into the cavity, wherein the cavity includes an inlet opening via which the liquid feed is fluidly connected to the cavity;

at least one liquid discharge connected to the cavity, through which liquid is removable from the cavity. wherein the cavity includes an outlet opening via which the liquid discharge is fluidly connected to the cavity; and

an interface to a microfluidic system, into which liquid is transferable,

wherein in a region of the outlet opening, the cavity is tapered so that, when the sample carrier is introduced, the sample carrier is mechanically deformed such that the smear sample at least partially escapes.

20. The device as claimed in claim 1 , wherein treatment reagents for the sample are stored in the cavity.

21. The device as claimed in claim 20 , wherein the treatment reagents comprise means for carrying out cell disintegration.

22. The device as claimed in claim 20 , wherein the treatment reagents comprise means for binding at least parts of the sample.

23. The device as claimed in claim 22 , wherein the means for binding at least parts of the sample are configured as magnetic beads, and wherein the device comprises a magnet unit configured to move the magnetic beads.

24. A method for extracting a smear sample, comprising:

introducing a sample carrier carrying a smear sample into a cavity of a device;

introducing liquid into the cavity through at least one liquid feed connected to the cavity, wherein the introduction of the liquid into the cavity is triggered automatically by closing a stopper;

releasing at least a portion of the smear sample from the sample carrier using the liquid; and

at least partially removing the liquid and the smear sample through at least one liquid discharge connected to the cavity.

25. A method for extracting a smear sample, comprising:

introducing a sample carrier carrying a smear sample into a cavity of a device;

introducing liquid into the cavity through at least one liquid feed connected to the cavity:

releasing at least a portion of the smear sample from the sample carrier using the liquid; and

at least partially removing the liquid and the smear sample through at least one liquid discharge connected to the cavity,

wherein the liquid is transported several times through the cavity, each time being transported from an outlet opening back to an inlet opening.

26. The method as claimed in claim 24 , further comprising disintegrating cells in the smear sample after releasing the portion of the smear sample.

27. A method for extracting a smear sample, comprising:

introducing a sample carrier carrying a smear sample into a cavity of a device;

introducing liquid into the cavity through at least one liquid feed connected to the cavity:

releasing at least a portion of the smear sample from the sample carrier using the liquid;

disintegrating cells in the released smear sample; and

at least partially removing the liquid and the released smear sample through at least one liquid discharge connected to the cavity, wherein target molecules contained in the cells are bound to functionalized magnetic beads and transported into the liquid discharge via a magnet unit.

28. The device as claimed in claim 2 , wherein the cavity comprises a reception opening configured to receive the sample carrier and a stopper, the reception opening being liquid-tightly sealable using the stopper.

29. The device as claimed in claim 28 , wherein the reception opening is germ-tightly sealable by the stopper.

30. The device as claimed in claim 21 , wherein the treatment reagents comprise means for binding at least parts of the sample.

31. The method as claimed in claim 24 , wherein the liquid is transported several times through the cavity, each time being transported from an outlet opening back to an inlet opening.

32. The device as claimed in claim 16 , wherein the sample carrier is at least partially enclosed essentially with a form fit by the access opening so that liquid from the cavity with the reception opening is transportable to the outlet opening only by passing through the sample carrier.