Stem cell storage, protection and extraction device

Abstract

The invention relates to the technical field of stem cell storage, and provides a stem cell storage, protection and extraction device which comprises an annular track, a test tube placement mechanism, a test tube barrel assembly and a selective taking-out mechanism, the test tube placement mechanism is rotationally arranged on the annular track, and the test tube placement mechanism comprises a first placement rotating disc and a second placement rotating disc; the first placing rotary disc is rotationally arranged on the bottommost annular track in the multiple annular tracks, the test tube placing mechanism is used for containing stem cell test tubes, the multiple test tube barrel assemblies are detachably arranged on the first placing rotary disc and the second placing rotary disc respectively, and the selecting and taking-out mechanism is detachably arranged on the sealing cover and the test tube placing mechanism. By means of the technical scheme, the problem that in the prior art, when stem cells are taken out of a liquid nitrogen barrel, the liquid nitrogen barrel is opened, so that a large number of test tubes make contact with the outside world, and the activity of the stem cells may be affected is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of stem cell storage, and in particular to a stem cell storage, protection and extraction device. Background Art

[0002] Stem cells are a type of multipotent cell with self-repair capabilities. Under certain conditions, stem cells can differentiate into a variety of functional cells. When a baby is just born, a certain amount of their metabolism is usually retained to facilitate the extraction of early stem cells for preservation. After being separated and purified by centrifugal equipment, the stem cells need to be stored in a liquid nitrogen barrel to maintain their activity.

[0003] Usually, multiple test tubes containing stem cells are placed directly in a liquid nitrogen barrel. When taking and placing the test tubes, the liquid nitrogen barrel needs to be opened as a whole, and the rack where the test tubes are placed needs to be taken out as a whole. After finding the target test tube, the other test tubes are put back. After opening the liquid nitrogen barrel and taking out the test tubes, if the stem cells are stored, if the temperature fluctuations are too large and they are repeatedly partially frozen and thawed, it will affect the internal structure of the cells and affect the storage quality of the stem cells. Summary of the Invention

[0004] The present invention proposes a stem cell storage, protection and extraction device to solve the problem in the prior art that when stem cells are taken out of a liquid nitrogen barrel, the liquid nitrogen barrel will be opened, causing a large number of test tubes to come into contact with the outside world, which may affect the activity of the stem cells.

[0005] The technical solutions of the present invention are as follows: A stem cell storage, protection and extraction device comprises a liquid nitrogen barrel and a sealing cover, the sealing cover being detachably connected to the liquid nitrogen barrel, and further comprising an annular track, a test tube placement mechanism, a test tube barrel assembly and a selection and removal mechanism. A plurality of annular tracks are provided, the plurality of annular tracks being fixedly connected to the liquid nitrogen barrel, the plurality of annular tracks being vertically equidistantly arranged, the test tube placement mechanism being rotatably arranged on the annular track, the test tube placement mechanism comprising a first placement turntable and a second placement turntable, the first placement turntable being rotatably arranged on the bottommost annular track among the plurality of annular tracks, the second placement turntable being provided in plurality and being rotatably arranged on the other annular tracks, the test tube placement mechanism being used to hold stem cell test tubes, the plurality of test tube barrel assemblies being provided, the plurality of test tube barrel assemblies being detachably mounted on the first placement turntable and the second placement turntable, the test tube barrel assembly containing a plurality of stem cell test tubes, the selection and removal mechanism being detachably mounted on the sealing cover and the test tube placement mechanism, the selection and removal mechanism being used to select from the plurality of test tube barrel assemblies and then remove the test tubes.

[0006] The placing turntable 1 and the placing turntable 2 are both provided with a plurality of placing through holes, the test tube barrel assembly is detachably arranged on the placing through holes, the placing turntable 2 is provided with a taking and placing through hole, the test tube barrel assembly can pass through the taking and placing through hole.

[0007] The test tube bucket assembly includes a holding bucket, a bracket 1, a bracket 2 and a hanging ring. There are multiple holding buckets, and multiple stem cell test tubes are placed in the holding bucket. There are multiple bracket 1s, and multiple bracket 1s are detachably connected to the placement through holes. There are multiple bracket 2s, and multiple bracket 2s are detachably connected to the placement through holes. Multiple bracket 1s and multiple bracket 2s are circumferentially arranged on the placement turntable 1 and the placement turntable 2. The bracket 2 and the bracket 1 are staggered with each other, and the hanging ring is fixedly connected to the bracket 1 and the bracket 2.

[0008] The selective removal mechanism includes a rotating shaft, a segmented rotating assembly and a removal hole. The rotating shaft is fixedly connected to the center of the placement turntable 1 and the placement turntable 2, and the adjacent rotating shafts are rotatably connected. The segmented rotating assembly is arranged on the rotating shaft and the sealing cover. The segmented rotating assembly is used to drive the placement turntable 1 or the placement turntable 2 to rotate respectively. The removal hole is opened on the sealing cover. The removal cover is detachably connected to the removal hole, and the test tube barrel assembly can pass through the removal hole.

[0009] The segmented rotation assembly includes a positioning hole, a through hole, a positioning rod, a rotating rod and a rotating member, the positioning hole is opened in the center of the sealing cover, the through hole is opened in the center of the rotating shaft, the through hole passes through the rotating shaft on the turntable 2, the through hole is the same shape as the positioning hole, the positioning rod is slidably arranged in the positioning hole, the positioning rod can slide in the through hole and the positioning hole, the positioning rod has the same shape as the positioning hole, the rotating rod is rotatably connected to the positioning rod, the rotating rod is fixedly connected to the rotating rod, the rotating rod has the same shape as the positioning rod, the rotating rod can slide in the positioning hole and the through hole, the rotating member is fixedly connected to the rotating rod, the rotating member and the rotating rod are respectively fixedly connected to the two ends of the rotating rod, the rotating shaft in contact with the positioning rod remains stationary, and the rotating shaft slidably connected to the rotating rod can rotate with the rotating rod.

[0010] The selective removal mechanism also includes a rotating clamp and a removal rod. The rotating clamp is detachably connected to the rotating member. Rotating the rotating clamp can drive the rotating rod and the rotating rod to rotate. One end of the removal rod is configured to be hook-shaped. The hook-shaped end of the removal rod is detachably connected to the hanging ring. After the removal rod is passed through the removal hole, the test tube barrel assembly can be lifted up, passed through the removal hole, and left the liquid nitrogen barrel.

[0011] A plurality of snap-fit ​​grooves are provided on the edge of the second placement turntable, and the snap-fit ​​grooves are arranged near the placement through-hole. A plurality of elastic sheets are provided in the liquid nitrogen barrel near the edge of the second placement turntable, and the elastic sheets cooperate with the snap-fit ​​grooves. The elastic sheets are arranged on one side of the liquid nitrogen barrel near the removal hole.

[0012] Identification plates are provided on the sealing cover and the removal cover, and the identification plates are used to identify information of the plurality of barrels on the first placement turntable and the second placement turntable.

[0013] The working principle and beneficial effects of the present invention are: 1. The present invention provides a first and a second turntable for placing test tubes. The stacked turntables increase the number of test tubes that can be placed, making full use of the space. At the same time, the first and second turntables can be rotated, so that the position of the bucket can be changed. The test tubes can be adjusted according to their positions before being taken out, thereby reducing the time the test tubes are in contact with the outside world. 2. The present invention provides a selective removal mechanism, which can adjust the position of the selected test tube, and then open the liquid nitrogen barrel to remove it when it is convenient to remove it, thereby reducing the time it takes for the test tube to leave the liquid nitrogen barrel and the amount of liquid nitrogen leaked; 3. The present invention provides a test tube placement mechanism, which can accommodate multiple barrels and fully utilize the space. The positions of the barrels can be adjusted by rotation. The barrels in different positions can be adjusted separately by providing a selective removal mechanism. The barrels can be removed after being adjusted to a removable position. Compared with the existing method of opening the liquid nitrogen barrel and then finding the stem cell test tubes to remove, the time other test tubes are exposed to the external environment is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal cross-sectional structure of the liquid nitrogen barrel of the present invention; Figure 3 It is a cross-sectional structural diagram of the cooperation between the positioning rod and the placement turntable in the present invention; Figure 4 This is a schematic cross-sectional view of the structure of the liquid nitrogen barrel and the placement turntable in the present invention; Figure 5 This is a schematic structural diagram of the sealing cover and the positioning rod in the present invention; Figure 6 This is a schematic diagram of the structure in which the sealing cover and the positioning rod are separated in the present invention; Figure 7 Schematic diagram of the internal cross-sectional structure of the removal rod and the lifting ring in the present invention; Figure 8 It is a partial cross-sectional structural diagram of the matching between the clamping groove and the elastic sheet in the present invention.

[0016] In the figure: 1. Liquid nitrogen barrel; 2. Sealing cover; 3. Annular track; 4. Placement turntable 1; 5. Placement turntable 2; 6. Placement barrel; 7. Bracket 1; 8. Bracket 2; 9. Lifting ring; 10. Rotating axis; 11. Removal hole; 12. Removal cover; 13. Positioning hole; 14. Through hole; 15. Positioning rod; 16. Rotating rod; 17. Rotating rod; 18. Rotating part; 19. Rotating clamp; 20. Removal rod; 21. Clamping groove; 22. Elastic sheet; 23. Identification plate; 24. Removal and placement through hole. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0018] like Figures 1 to 8As shown, this embodiment proposes a stem cell storage, protection and extraction device, including a liquid nitrogen barrel 1 and a sealing cover 2, the sealing cover 2 is detachably connected to the liquid nitrogen barrel 1, and also includes a circular track 3, a test tube placement mechanism, a test tube barrel assembly and a selection and removal mechanism, a plurality of circular tracks 3 are provided, a plurality of circular tracks 3 are fixedly connected to the liquid nitrogen barrel 1, a plurality of circular tracks 3 are arranged at equal vertical intervals, the test tube placement mechanism is rotatably set on the circular track 3, the test tube placement mechanism includes a placement turntable 1 4 and a placement turntable 2 5, the placement turntable 1 4 is rotatably set on the circular track 3 located at the bottom of the plurality of circular tracks 3, a plurality of placement turntables 2 5 are provided, and they are rotatably set on other circular tracks 3 respectively, the test tube placement mechanism is used to hold stem cell test tubes, a plurality of test tube barrel assemblies are provided, and a plurality of test tube barrel assemblies are detachably set on the placement turntable 1 4 and the placement turntable 2 5 respectively, the test tube barrel A plurality of stem cell test tubes are placed in the assembly, and a selection and removal mechanism is detachably provided on the sealing cover 2 and the test tube placement mechanism. The selection and removal mechanism is used to select from a plurality of test tube barrel assemblies and then remove them. The present application increases the number of stem cell test tubes placed by arranging a plurality of rotatable trays in the liquid nitrogen barrel 1 to place the holding barrels 6. At the same time, by opening small holes on the sealing cover 2, after rotating the corresponding turntable to the corresponding position, the holes on the sealing cover 2 are opened for sampling, thereby avoiding contact between all stem cell test tubes and the external environment, and reducing the area and time of opening the cover, shortening the loss of liquid nitrogen, and protecting the stem cell test tubes in the liquid nitrogen barrel 1. Compared with the existing liquid nitrogen barrel 1, which requires opening the sealing cover 2 completely for selection and then placing the stem cell test tubes, the contact time of other test tubes that are not needed with the outside world is reduced.

[0019] like Figures 2 to 4 As shown, a plurality of placement through holes are provided on the placement turntable 1 4 and the placement turntable 2 5, and the test tube bucket assembly is detachably arranged on the placement through holes. The placement turntable 2 5 is provided with a take-and-place through hole 24, and the test tube bucket assembly can pass through the take-and-place through hole 24. In this embodiment, three placement turntables 2 5 are provided. When it is necessary to take the placing turntable 2 5 or the holding bucket 6 on the lower layer, the holding bucket 6 on the lower layer can be taken through the take-and-place through hole 24 on the upper layer of the placement turntable 2 5, and taken out upward through the take-and-place through hole 24. The provision of the take-and-place through hole 24 avoids the problem of taking out the upper bracket when taking out the holding bucket 6 on the lower layer, so that all the holding buckets 6 do not need to leave the liquid nitrogen barrel 1, and are also convenient for taking.

[0020] like Figures 2 to 4As shown, the test tube barrel assembly includes a holding barrel 6, a bracket 1 7, a bracket 2 8 and a hanging ring 9. There are multiple holding barrels 6, and multiple stem cell test tubes are placed in the holding barrel 6. There are multiple brackets 1 7, and multiple brackets 1 7 are detachably connected to the placement through holes. There are multiple brackets 2 8, and multiple brackets 2 8 are detachably connected to the placement through holes. Multiple brackets 1 7 and multiple brackets 2 8 are circumferentially arranged on the placement turntable 1 4 and the placement turntable 2 5. The brackets 2 8 and the brackets 1 7 are staggered with each other. The brackets 1 7 and the brackets 2 8 are fixedly connected to the hanging ring. Ring 9, two buckets 6 are placed on bracket one 7, and the hanging ring 9 is set between the two buckets 6. A bucket 6 is placed on bracket two 8. A counterweight block is set on the end of bracket two 8 away from the bucket 6 to avoid a large tilt when bracket two 8 is taken out. The arrangement of bracket two 8 can make use of the gap between brackets one 7 and make more full use of space. In this embodiment, five brackets one 7 and five brackets two 8 are set on the placement turntable one 4, and four brackets one 7 and five brackets two 8 are set on the placement turntable two 5.

[0021] like Figures 2 to 7 As shown, the selective removal mechanism includes a rotating shaft 10, a segmented rotating assembly and a removal hole 11. The rotating shaft 10 is fixedly connected to the center of the placing turntable 1 4 and the placing turntable 2 5. The adjacent rotating shafts 10 are rotatably connected. The segmented rotating assembly is arranged on the rotating shaft 10 and the sealing cover 2. The segmented rotating assembly is used to respectively drive the placing turntable 1 4 or the placing turntable 2 5 to rotate. The removal hole 11 is opened on the sealing cover 2. The removal hole 11 is detachably connected with a removal cover 12. The test tube barrel assembly can pass through the removal hole 11 and drive the placing turntable 1 4 or the placing turntable 2 5 to rotate by disassembling the rotating assembly, so that the corresponding placing turntable 1 4 or the placing turntable 2 5 The containing barrel 6 is rotated to the position aligned with the removal hole. 11 is aligned, and the removal cover 12 is opened at this time. The removal mechanism also includes a rotating clamp 19 and a removal rod 20. The rotating clamp 19 is detachably connected to the rotating member 18. Rotating the rotating clamp 19 can drive the rotating rod 16 and the rotating rod 17 to rotate. One end of the removal rod 20 is set to a hook shape, and the hook-shaped end of the removal rod 20 is detachably connected to the hanging ring 9. After the removal rod 20 passes through the removal hole 11, the test tube barrel assembly can be lifted up and passed through the removal hole 11 to leave the liquid nitrogen barrel 1. The removal rod 20 is extended into the removal hole 11 and hooked on the hanging ring 9, and the holding barrel 6 can be pulled out upward, thereby completing the removal of the holding barrel 6. After selecting the test tube in the holding barrel 6, the holding barrel 6 is put back through the removal rod 20.

[0022] like Figures 3 to 7As shown, the segmented rotating assembly includes a positioning hole 13, a through hole 14, a positioning rod 15, a rotating rod 16 and a rotating member 18. The positioning hole 13 is opened in the center of the sealing cover 2, and the through hole 14 is opened in the center of the rotating shaft 10. The through hole 14 passes through the rotating shaft 10 placed on the turntable 2 5. The through hole 14 has the same shape as the positioning hole 13. The positioning rod 15 is slidably set in the positioning hole 13. The positioning rod 15 can slide in the through hole 14 and the positioning hole 13. The positioning rod 15 has the same shape as the positioning hole 13. The rotating rod 16 The rotating rod 16 is connected to the positioning rod 15, and the rotating rod 17 is fixedly connected to the rotating rod 16. The shape of the rotating rod 17 is the same as that of the positioning rod 15. The rotating rod 17 can slide in the positioning hole 13 and the through hole 14. The rotating member 18 is fixedly connected to the rotating rod 16. The rotating member 18 and the rotating rod 17 are respectively fixedly connected to the two ends of the rotating rod 16. The rotating shaft 10 in contact with the positioning rod 15 remains stationary, and the rotating shaft 10 slidably connected to the rotating rod 17 can rotate with the rotating rod 17. When the bucket 6 is not being taken out, the rotating shaft 10 is in a stationary state. When the rotating rod 17 is rotated, the positioning rod 15 and the rotating rod 17 extend into the through holes 14 of the four rotating shafts 10, the rotating rod 17 is in the through hole 14 on the placing turntable 1 4, and the positioning rod 15 passes through the positioning hole 13 and the through holes 14 on the three placing turntables 2 5. For example, when the bucket 6 on the placing turntable 2 5 on the second layer needs to be taken, the positioning rod 15 is pulled upward so that the rotating rod 17 moves to the through hole 14 on the placing turntable 2 5 on the second layer, and the positioning rod 15 passes through the through hole 14 on the placing turntable 1 4 on the first layer. And the positioning hole 13, since the positioning hole 13 cannot rotate, the first-layer placing turntable 2 5 cannot rotate, and the pick-up and placement through hole 24 on the first-layer placing turntable 2 5 is aligned with the removal hole 11. At this time, the rotating clamp 19 is connected to the rotating member 18, and the rotating clamp 19 is rotated to make the rotating member 18 drive the second-layer placing turntable 2 5 to rotate through the rotating rod 16 and the rotating rod 17. When the storage bucket 6 to be taken out is aligned with the pick-up and placement through hole 24, the removal cover 12 is opened and the removal rod 20 is inserted to take out the bracket 1 7 or the bracket 2 8.

[0023] like Figure 8 As shown, a plurality of snap-in grooves 21 are provided on the edge of the placing turntable 2 5 , and the snap-in grooves 21 are arranged near the position of the retrieval through-hole 24 . A plurality of elastic sheets 22 are provided near the edge of the placing turntable 2 5 in the liquid nitrogen barrel 1 , and the elastic sheets 22 cooperate with the snap-in grooves 21 . The elastic sheets 22 are arranged on the side of the liquid nitrogen barrel 1 near the removal hole 11 . When the snap-in grooves 21 and the elastic sheets 22 are docked, it can be seen that the retrieval through-hole 24 is aligned with the removal hole 11 . When rotating, the snap-in grooves 21 and the elastic sheets 22 are staggered to squeeze the elastic sheets 22 to bend and deform. The docking of the snap-in grooves 21 and the elastic sheets 22 can also prevent the placing turntable 2 5 from rotating when taking out the containing barrel 6 so that the retrieval through-hole 24 is not aligned with the removal hole 11 .

[0024] like Figure 1and Figure 6 As shown, an identification plate 23 is provided on the sealing cover 2 and the removal cover 12. The identification plate 23 is used to identify the information of multiple barrels 6 on the placement turntable 1 4 and the placement turntable 2 5. Since there is one placement turntable 1 4 and three placement turntables 2 5 in this embodiment, there are four ring layers provided on the sealing cover 2, each ring layer corresponds to a layer of barrels 6, and the placement turntable 1 4 and the placement turntable 2 5 can determine the rotation position through the cooperation of the clamping groove 21 and the elastic sheet 22, and then determine the position of each barrel 6 and then determine how much to rotate to remove the corresponding holding plate.

[0025] In this embodiment, when it is necessary to take out the stem cell test tube, first open the cover covering the rotating member 18, pull the rotating member 18 upward until the rotating rod 17 is on the placement turntable 1 4 or the placement turntable 2 5 where the holding bucket 6 that needs to be taken out is located, then rotate the clamping member 19, and drive the rotating rod 16 and the rotating rod 17 through the rotating member 18. The rotating rod 17 drives the rotating shaft 10 and the placement turntable 1 4 or the placement turntable 2 5 to rotate in the through hole 14. When the corresponding holding bucket 6 is aligned with the taking-out hole 11, open the taking-out cover 12, pass the taking-out rod 20 through the taking-out hole 11 and the taking-in and placing through hole 24, hook it on the required hanging ring 9 and take it upward to obtain the required holding bucket 6. After taking the test tube in it, put it back through the taking-out rod 20 to complete the taking and placing of the test tube.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stem cell storage, protection and extraction device, comprising a liquid nitrogen barrel (1) and a sealing cover (2), wherein the sealing cover (2) is detachably connected to the liquid nitrogen barrel (1), characterized in that: Also includes: A plurality of annular tracks (3) are provided, wherein the plurality of annular tracks (3) are fixedly connected to the liquid nitrogen barrel (1), and the plurality of annular tracks (3) are arranged at equal vertical intervals; A test tube placement mechanism is rotatably arranged on the annular track (3), and the test tube placement mechanism includes a placement turntable 1 (4) and a placement turntable 2 (5). The placement turntable 1 (4) is rotatably arranged on the annular track (3) located at the bottom among the plurality of annular tracks (3), and a plurality of placement turntables 2 (5) are provided, which are rotatably arranged on the other annular tracks (3). The test tube placement mechanism is used for accommodating stem cell test tubes; There are multiple test tube barrel assemblies, and the multiple test tube barrel assemblies are detachably arranged on the placement turntable 1 (4) and the placement turntable 2 (5), respectively, and multiple stem cell test tubes are placed in the test tube barrel assemblies; The selection and removal mechanism is detachably arranged on the sealing cover (2) and the test tube placement mechanism, and is used to select and then remove from the plurality of test tube barrel assemblies.

2. The stem cell storage, protection and extraction device according to claim 1, characterized in that: The placing turntable 1 (4) and the placing turntable 2 (5) are both provided with a plurality of placing through holes, and the test tube barrel assembly is detachably arranged on the placing through holes. The placing turntable 2 (5) is provided with a taking and placing through hole (24), and the test tube barrel assembly can pass through the taking and placing through hole (24).

3. The stem cell storage, protection and extraction device according to claim 2, characterized in that: The test tube barrel assembly includes: A plurality of holding barrels (6) are provided, wherein a plurality of stem cell test tubes are placed in the holding barrels (6); A plurality of brackets (7) are provided, and the plurality of brackets (7) are detachably connected to the placement through holes; There are multiple brackets 2 (8), and the multiple brackets 2 (8) are detachably connected to the placement through hole. The placement turntable 1 (4) and the placement turntable 2 (5) are both circumferentially provided with multiple brackets 1 (7) and multiple brackets 2 (8), and the brackets 2 (8) and the brackets 1 (7) are staggered with each other. A lifting ring (9) is fixedly connected to the bracket 1 (7) and the bracket 2 (8).

4. The stem cell storage, protection and extraction device according to claim 3, characterized in that: The selective removal mechanism includes: A rotating shaft (10) is fixedly connected to the center of the first placing turntable (4) and the second placing turntable (5), and adjacent rotating shafts (10) are rotatably connected; A segmented rotating assembly is provided on the rotating shaft (10) and the sealing cover (2), and the segmented rotating assembly is used to respectively drive the placement turntable 1 (4) or the placement turntable 2 (5) to rotate; A take-out hole (11) is provided on the sealing cover (2), a take-out cover (12) is detachably connected to the take-out hole (11), and the test tube barrel assembly can pass through the take-out hole (11).

5. The stem cell storage, protection and extraction device according to claim 4, characterized in that: The segmented rotating assembly comprises: A positioning hole (13) is provided in the center of the sealing cover (2); A through hole (14) is provided at the center of the rotating shaft (10), the through hole (14) passes through the rotating shaft (10) on the second rotating disk (5), and the through hole (14) has the same shape as the positioning hole (13); A positioning rod (15) is slidably disposed in the positioning hole (13), the positioning rod (15) being capable of sliding in the through hole (14) and the positioning hole (13), and the positioning rod (15) having the same shape as the positioning hole (13); a rotating rod (16) rotatably connected to the positioning rod (15); a rotating rod (17) fixedly connected to the rotating rod (16); the rotating rod (17) having the same shape as the positioning rod (15); and the rotating rod (17) being capable of sliding in the positioning hole (13) and the through hole (14); The rotating member (18) is fixedly connected to the rotating rod (16), and the rotating member (18) and the rotating rod (17) are respectively fixedly connected to two ends of the rotating rod (16).

6. The stem cell storage, protection and extraction device according to claim 5, characterized in that: The selective removal mechanism also includes: A rotating clamp (19) is detachably connected to the rotating member (18), and rotating the rotating clamp (19) can drive the rotating rod (16) and the rotating stick (17) to rotate; A take-out rod (20) has one end in a hook shape, and the hook-shaped end of the take-out rod (20) is detachably connected to the hanging ring (9). After the take-out rod (20) passes through the take-out hole (11), the test tube barrel assembly can be lifted up through the take-out hole (11) and out of the liquid nitrogen barrel (1).

7. The stem cell storage, protection and extraction device according to claim 6, characterized in that: The edge of the second placement turntable (5) is provided with a plurality of snap-in grooves (21), and the snap-in grooves (21) are arranged at a position close to the taking-in and putting-out through-hole (24). The liquid nitrogen barrel (1) is provided with a plurality of elastic sheets (22) at a position close to the edge of the second placement turntable (5), and the elastic sheets (22) cooperate with the snap-in grooves (21). The elastic sheets (22) are arranged on one side of the liquid nitrogen barrel (1) close to the taking-out hole (11).

8. The stem cell storage, protection and extraction device according to claim 7, characterized in that: An identification plate (23) is provided on the sealing cover (2) and the removal cover (12), and the identification plate (23) is used to identify information of the plurality of containing barrels (6) on the placing turntable 1 (4) and the placing turntable 2 (5).

9. The stem cell storage, protection and extraction device according to claim 8, characterized in that: The rotating shaft (10) in contact with the positioning rod (15) remains stationary, and the rotating shaft (10) in sliding connection with the rotating rod (17) can rotate along with the rotating rod (17).

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