Biological sheet storage device

1. A biological sheet storage device comprising:

a holding unit comprising a first carrier, a second carrier and a fixture, wherein the first carrier is configured to carry a biological sheet, the first carrier is on the second carrier, and the fixture is configured to fix the first carrier onto the second carrier; and

an enclosure configured to enclose the holding unit that is configured to carry the biological sheet,

wherein the fixture comprises at least one pressing plate,

wherein the first carrier comprises a body that is configured to carry the biological sheet and an extension extending from the body with the extension extending beyond the body, and

wherein the at least one pressing plate is configured to movably press against at least a portion of the extension of the first carrier.

2. The biological sheet storage device according to claim 1 ,

wherein the fixture comprises a plurality of pressing plates,

wherein each of the plurality of pressing plates has a first end connected to a first connector.

3. The biological sheet storage device according to claim 2 ,

wherein the fixture comprises two parallel rectangular pressing plates, and

wherein a first end of each of the pressing plates extends beyond the second carrier and is connected to the first connector.

4. The biological sheet storage device according to claim 2 , wherein a second end of each of the pressing plates is connected to a second connector.

5. The biological sheet storage device according to claim 4 ,

wherein at least one of the plurality of pressing plates, the first connector and the second connector are connected to form an enclosed region, and

wherein the biological sheet is in an orthographic projection area of the enclosed region in a state that the first carrier carries the biological sheet.

6. The biological sheet storage device according to claim 2 , wherein the first carrier comprises a water and air permeable cover film configured to at least partially cover the biological sheet in a state that the first carrier carries the biological sheet.

7. The biological sheet storage device according to claim 2 , wherein the first connector is connected to the second carrier by a rotating mechanism configured to engage the fixture with the second carrier or disengage the fixture from the second carrier.

8. The biological sheet storage device according to claim 1 , wherein the first carrier comprises at least one projection connected to an extension extending from a body for that is configured to carry the biological sheet.

9. The biological sheet storage device according to claim 1 , wherein the first carrier comprises a carrier film comprising a material having tissue compatibility with the biological sheet that is carried.

10. The biological sheet storage device according to claim 1 , wherein the biological sheet comprises a cell sheet.

11. The biological sheet storage device according to claim 1 ,

wherein the enclosure comprises a first diaphragm and a second diaphragm,

wherein the first diaphragm and the second diaphragm are oppositely disposed with respect to each other, and

wherein corresponding side edges of the first diaphragm and the second diaphragm are connected through a heat conductive material so that the first diaphragm and the second diaphragm form a bag with an end thereof open.

12. The biological sheet storage device according to claim 11 , wherein an open end of the bag is provided with a sealing structure for sealing the bag.

13. The biological sheet storage device according to claim 12 ,

wherein a protective liquid is in the enclosure, and

wherein the holding unit is immersed in the protective liquid.

14. The biological sheet storage device according to claim 13 , wherein the protective liquid at least comprises dimethyl sulfoxide.