Cryostorage device for oocytes and embryos during cryopreservation
Described herein are devices, systems, and methods to facilitate cryopreservation of a cell or a mass of a plurality of cells such as oocytes or embryos. A device of the disclosure can, for example, store oocytes or embryos during the vitrification and/or warming processes of in vitro fertilization.
1. A cryo-storage device comprising:
(a) a capillary element comprising a first elongated body, wherein the first elongated body comprises:
(i) a bottom opening located at a bottom end of the first elongated body;
(ii) a top opening located at a top end of the first elongated body; and
(iii) a hollow portion inside the first elongated body connecting the top opening to the bottom opening, wherein the hollow portion has a diameter that is regular over a length of a region of the hollow portion;
(b) a slidable plunger comprising a top end, a bottom end, and a second elongated body connecting the top end of the slidable plunger to the bottom end of the slidable plunger, wherein:
at least a portion of the slidable plunger is within the hollow portion of the capillary element;
the slidable plunger is configured to actuate through the top opening;
a diameter of the slidable plunger is regular over a length of a portion of the slidable plunger; and
the diameter of the slidable plunger is no greater than the diameter of the hollow portion of the capillary element; and
(c) a content comprising:
(i) a cell; and
(ii) a volume of media;
wherein:
the content is within a section of the hollow portion of the capillary element located between the bottom opening and the bottom end of the slidable plunger;
the volume of media, which when contained in the section of the hollow portion of the capillary element, cools at an average rate of at least about 200° C./minute upon submersion of the section of the hollow portion of the capillary element into a coolant; and
(d) a pipettor comprising:
(I) an elongated casing comprising a top end and a bottom end, wherein the top end of the first elongated body and the top end of the slidable plunger are contained within the bottom end of the elongated casing;
(II) a clamping mechanism, wherein the clamping mechanism is clamped onto a tab that connects the capillary element to the bottom end of the elongated casing;
(III) a pipetting plunger comprising a top end, a bottom end, and a third elongated body connecting the top end of the pipetting plunger and the bottom end of the pipetting plunger; and
(IV) an actuation element connecting the pipetting plunger to the elongated casing and configured to actuate the pipetting plunger;
wherein:
the bottom end of the pipetting plunger is within the elongated casing;
the top end of the pipetting plunger is outside the elongated casing; and
the pipetting plunger is configured so that actuation of the pipetting plunger controls movement of the slidable plunger.
2. The cryo-storage device of claim 1 , further comprising a seal that seals the slidable plunger to the hollow portion of the capillary element.
3. The cryo-storage device of claim 2 , wherein the seal is formed by a fit of the slidable plunger into the hollow portion of the capillary element.
4. The cryo-storage device of claim 1 , wherein a closed system is formed upon sealing of a second section of the hollow portion of the capillary element, wherein the content is located between the second section of the hollow portion of the capillary element and the bottom end of the slidable plunger.
5. The cryo-storage device of claim 1 , wherein the hollow portion of the capillary element is about cylindrical.
6. The cryo-storage device of claim 1 , wherein the slidable plunger is about cylindrical.
7. The cryo-storage device of claim 1 , wherein the capillary element is rigid.
8. The cryo-storage device of claim 1 , wherein, when the content is vitrified, the volume of media, when contained within the section of the hollow portion of the capillary element, warms at an average rate of at least about 10,000° C./minute upon submersion of the section of the hollow portion of the capillary element into a liquid with a temperature of at least about 30° C.
9. The cryo-storage device of claim 8 , wherein the liquid has a temperature of about 37° C.
10. The cryo-storage device of claim 1 , wherein the capillary element has a thermal conductivity of at least about 0.05 W/m·K.
11. The cryo-storage device of claim 1 , further comprising a cover comprising an outer structure and an inner void, wherein at least a portion of the first elongated body is within the inner void of the cover.
12. The cryo-storage device of claim 1 , wherein the capillary element has a cross-sectional area that is about constant across a length of the capillary element, wherein the length of the capillary element is a region between the bottom end of the first elongated body to the top end of the first elongated body.
13. The cryo-storage device of claim 1 , wherein the content has a volume of about 0.2 μL to about 5 μL.
14. The cryo-storage device of claim 1 , further comprising a displacement mechanism attached to the elongated casing, wherein the displacement mechanism is configured so that actuation of the displacement mechanism controls movement of the slidable plunger.
15. The cryo-storage device of claim 1 , wherein the top end of the slidable plunger is bent at an angle of about 15 degrees to about 100 degrees to form a bent end.
16. The cryo-storage device of claim 1 , wherein the top end of the slidable plunger is bent at an angle of about 90 degrees to form the bent end.
17. The cryo-storage device of claim 1 , wherein:
the pipetting plunger further comprises a protrusion on the third elongated body;
the pipettor further comprises a spring;
the spring is wrapped around the third elongated body and located between the bottom end of the pipetting plunger and the protrusion;
the spring is in contact with the protrusion;
the protrusion is configured to hold the spring in place; and
the spring is configured to dampen motion of the pipetting plunger.
18. The cryo-storage device of claim 1 , further comprising a button operatively connected to the top end of the pipetting plunger, wherein the button is configured so that pushing of the button causes the pipetting plunger to actuate through the elongated casing.
19. The cryo-storage device of claim 1 , wherein the bottom end of the pipetting plunger is directly connected to the top end of the slidable plunger.
20. The cryo-storage device of claim 1 , wherein the bottom end of the pipetting plunger is indirectly connected to the top end of the slidable plunger.