Stem cell storage, protection and extraction device

Abstract

The invention discloses a stem cell storage, protection and extraction device, and belongs to the technical field of stem cell storage. A mounting frame and a supporting plate are further included, holes are evenly formed in the surface of the supporting plate, and the mounting frame is sleeved with the supporting plate through the holes; supporting plates are uniformly mounted on the mounting rack in a sliding manner, a storage basket is detachably mounted on the top walls of the supporting plates, and reagent bottles are arranged in the storage basket; a partition plate is slidably mounted in the tank body, and a through hole is formed in the top wall of the partition plate and matched with the supporting plate; an electric telescopic rod of which the output end is fixedly connected with the partition plate is fixedly inserted into the inner top wall of the tank body; a fixing mechanism for fixing the supporting plate in the through hole is arranged on the partition plate; two pressure release valves are embedded in the partition plate; through mutual cooperation of the electric telescopic rod, the partition plate and the supporting plate, liquid nitrogen in the tank body can be prevented from being directly exposed in air when the storage basket is taken out, then evaporation loss of the liquid nitrogen is reduced, meanwhile, the liquid level descending speed in the tank body can be reduced, and samples in the tank body are prevented from going bad.

Description

Technical Field

[0001] This invention relates to the field of stem cell storage technology, and more specifically, to a stem cell storage, protection, and extraction device. Background Technology

[0002] Stem cells are a type of cell with unlimited or immortal self-renewal capacity, capable of producing at least one type of highly differentiated daughter cells. Currently, most biologists and medical scientists believe that stem cells are a type of cell that originates from embryos, fetuses, or adults and has the ability to self-renew, proliferate, and differentiate without limitation under certain conditions. They can produce daughter cells with the same phenotype and genotype as themselves, as well as specialized cells that make up the body's tissues and organs, and can also differentiate into progenitor cells.

[0003] Currently, the long-term safe storage of stem cell samples relies on the -196°C cryogenic environment provided by liquid nitrogen tanks. Maintaining a stable liquid nitrogen level is crucial for ensuring sample viability. However, existing storage procedures have an inherent flaw: each time the tank is opened for sample extraction or storage, it artificially induces a significant amount of liquid nitrogen evaporation. This frequent, operation-related evaporation loss not only increases the cost of expensive liquid nitrogen replenishment but also accelerates the drop in liquid nitrogen level, increasing the risk of sample deterioration due to failure to replenish liquid nitrogen in a timely manner.

[0004] To address this, a stem cell storage, preservation, and extraction device is proposed. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a stem cell storage, protection, and extraction device that can reduce the amount of liquid nitrogen evaporation inside the tank during the process of removing samples from the tank.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A stem cell storage, preservation, and extraction device, comprising a tank; It also includes a mounting bracket and a tray, with evenly spaced holes on the surface of the tray, which is fitted onto the mounting bracket through the holes; The mounting rack has trays that slide evenly on it, and a storage basket that can be detachably installed on the top wall of the tray contains reagent bottles. A baffle is slidably installed inside the tank. A through hole is provided on the top wall of the baffle, and the through hole cooperates with the support plate. An electric telescopic rod with its output end fixedly connected to the partition is fixedly inserted into the inner top wall of the tank; Furthermore, the partition is equipped with a fixing mechanism for fixing the tray in the through hole; Two pressure relief valves are embedded in the partition, with the output ends of the two pressure relief valves located on the top and bottom walls of the partition, respectively.

[0008] Furthermore, the fixing mechanism includes a slot formed on the side wall of the through hole; an insertion hole is formed on the side wall of the tray, a locking rod that slidably engages with the slot is slidably installed in the insertion hole, and a first driving mechanism for driving the locking rod to move is provided on the partition plate.

[0009] Furthermore, the first drive mechanism includes a first permanent magnet fixedly mounted on the side wall of the lever, and a first spring fixedly mounted between the lever and the side wall of the insertion hole; A cavity is provided on the partition, and an electromagnet that attracts the first permanent magnet is provided inside the cavity.

[0010] Furthermore, the surface of the storage basket is evenly perforated, and the top wall of the tray is provided with a flow guide groove.

[0011] Furthermore, the pressure relief valve includes a sleeve, a second spring, and a baffle; The sleeve is fixedly embedded in the partition plate, and the two ends of the sleeve are the input end and the output end, respectively; The baffle is hinged to the output end of the sleeve; The two ends of the second spring are fixedly connected to the inner wall of the sleeve and the top wall of the baffle, respectively.

[0012] Furthermore, a third spring that cooperates with the upper support plate is evenly fixed on the top wall of the storage basket.

[0013] Furthermore, a limit sleeve is vertically fixedly installed on the inner top wall of the tank.

[0014] Furthermore, an installation groove is provided on the top wall of the pallet, and an installation hole is vertically provided on the bottom wall of the installation groove. A top rod is vertically slidably inserted into the installation hole, and a top plate that is fixedly connected to the bottom wall and the top rod is slidably installed in the installation groove. A second drive mechanism for driving the top plate to move upward is provided on the tank body.

[0015] Furthermore, the second driving mechanism includes a bar magnet fixedly installed on the inner wall of the limiting sleeve, a push rod made of magnetic material, and the top end of the push rod attracts the bottom end of the bar magnet.

[0016] Furthermore, the mounting bracket includes a base and four guide rods, which are vertically fixed on the top wall of the base and are evenly distributed circumferentially.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This solution, through the cooperation of electric telescopic rod, partition and tray, can prevent the liquid nitrogen in the tank from being directly exposed to the air when the storage basket is taken out, thereby reducing the evaporation loss of liquid nitrogen. At the same time, it can reduce the rate of liquid level drop in the tank and prevent the sample in the tank from deteriorating.

[0018] (2) This solution sets a limiting sleeve inside the tank that communicates with the opening. When the partition moves up to the maximum extent, the bottom wall of the limiting sleeve fits against the top wall of the partition. This reduces the amount of heat exchange between the inside of the tank and the outside when the staff takes out the storage basket, and prevents a large amount of outside gas from entering the tank. This reduces the amount of liquid nitrogen volatilization inside the tank.

[0019] (3) This solution uses a top plate that can move up and down on the surface of the pallet to move the storage basket, so that when the lid is opened, it is convenient for the staff to take out the storage basket, shortening the time required to take out the storage basket, reducing the heat exchange between the inside of the tank and the outside air, and reducing the amount of liquid nitrogen volatilization in the tank. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the structure of the tray of the present invention; Figure 6 This is a schematic diagram of the combined structure of the tray and mounting frame of the present invention; Figure 7 This is a schematic diagram of the partition structure of the present invention.

[0021] Explanation of the labels in the diagram: 1. Tank body; 2. Mounting bracket; 201. Base; 202. Guide rod; 3. Support plate; 4. Storage basket; 5. Reagent bottle; 6. Partition; 7. Electric telescopic rod; 8. Pressure relief valve; 801. Sleeve; 802. Baffle; 803. Second spring; 9. Slot; 10. Insertion hole; 11. Locking rod; 12. First permanent magnet; 13. First spring; 14. Electromagnet; 15. Hole; 16. Flow guide channel; 17. Third spring; 18. Limiting sleeve; 19. Top rod; 20. Top plate; 21. Bar magnet; 22. Opening; 23. Cap. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example 1: Please see Figures 1 to 7 A stem cell storage, protection and extraction device includes a tank 1; the tank 1 is an insulated tank, and the top wall of the tank 1 is provided with an opening 22, and a cover 23 made of heat-insulating material is detachably installed on the tank 1, the cover 23 being used to seal the opening 22. It also includes a mounting frame 2 and a tray 3. Holes 15 are evenly distributed on the surface of the tray 3, and the tray 3 is fitted onto the mounting frame 2 through the holes 15. A tray 3 is evenly slidably installed on the mounting frame 2. A storage basket 4 is detachably installed on the top wall of the tray 3, and a reagent bottle 5 is contained in the storage basket 4. A partition 6 is slidably installed inside the tank body 1. A through hole is provided on the top wall of the partition 6, and the through hole cooperates with the support plate 3. An electric telescopic rod 7 with its output end fixedly connected to the partition plate 6 is fixedly inserted into the inner top wall of the tank body 1; Furthermore, the partition 6 is provided with a fixing mechanism for fixing the tray 3 in the through hole; Two pressure relief valves 8 are embedded in the partition 6, and the output ends of the two pressure relief valves 8 are located on the top wall and bottom wall of the partition 6, respectively.

[0024] The fixing mechanism includes a slot 9 formed on the side wall of the through hole; an insertion hole 10 is formed on the side wall of the support plate 3, and a locking rod 11 that cooperates with the slot 9 is slidably installed in the insertion hole 10, and a first driving mechanism for driving the locking rod 11 to move is provided on the partition plate 6.

[0025] The first drive mechanism includes a first permanent magnet 12 fixedly installed on the side wall of the lever 11, and a first spring 13 fixedly installed between the lever 11 and the side wall of the insertion hole 10; the first spring 13 is made of low-temperature resistant austenitic stainless steel. A cavity is provided on the partition 6, and an electromagnet 14 that is attracted to the first permanent magnet 12 is provided inside the cavity; Among them, partition 6, support plate 3, clamp rod 11 and mounting bracket 2 are all made of thermal insulation material.

[0026] First, place the tray 3 onto the mounting frame 2, then place the storage basket 4 on the top wall of each tray 3, and place the reagent bottle 5 containing stem cells in the storage basket 4.

[0027] Then, liquid nitrogen is injected into the tank 1, and the mounting bracket 2 with the tray 3 and the storage basket 4 is placed into the tank 1. The opening 22 of the tank 1 is then sealed with the cap 23.

[0028] When taking out the sample, the electric telescopic rod 7 is activated first. The output end of the electric telescopic rod 7 drives the partition 6 to move down. When the partition 6 moves down and is fitted outside the tray 3, the slot 9 is aligned with the rod 11.

[0029] Then, the electromagnet 14 is energized. At this time, the electromagnet 14 is aligned with the first permanent magnet 12. Under the attraction between the electromagnet 14 and the first permanent magnet 12, the first permanent magnet 12 drives the locking rod 11 to insert into the locking slot 9. The first spring 13 is gradually stretched, so that the partition 6 and the support plate 3 can be fixed together through the cooperation of the locking rod 11 and the locking slot 9. Then, the electric telescopic rod 7 is controlled to retract. During this process, the low-temperature air above the partition 6 in the tank 1 is discharged into the space below the partition 6 through the pressure relief valve 8, thereby reducing the amount of cold air loss when the cover 23 is opened. Until the partition 6 moves the storage basket 4 on the surface of the tray 3 into the opening 22, the cover 23 is opened, the storage basket 4 on the surface of the tray 3 is taken out, and the tray 3 is still fixed to the partition 6 to prevent the liquid nitrogen from directly contacting the outside air.

[0030] During the process of the partition 6 moving the storage basket 4 upwards via the tray 3 and opening the cover 23 to remove the storage basket 4, the partition 6 and the tray 3, made of heat-insulating material, prevent the liquid nitrogen located below the partition 6 from directly contacting the outside air, reducing the probability of liquid nitrogen absorbing heat and preventing liquid nitrogen from evaporating, thus saving costs.

[0031] like Figure 6 As shown, the surface of the storage basket 4 is evenly provided with holes 15, and the top wall of the tray 3 is provided with a guide groove 16. Under the action of the holes 15 and the guide groove 16, the contact area between the reagent bottle 5 and the liquid nitrogen is increased, which ensures that the reagent bottle 5 can be immersed in the liquid nitrogen.

[0032] like Figure 3 As shown, the pressure relief valve 8 includes a sleeve 801, a second spring 803, and a baffle 802; The sleeve 801 is fixedly embedded in the partition 6, and the two ends of the sleeve 801 are the input end and the output end, respectively; The baffle 802 is hinged to the output end of the sleeve 801; The two ends of the second spring 803 are fixedly connected to the inner wall of the sleeve 801 and the top wall of the baffle 802, respectively.

[0033] For the pressure relief valve 8 whose output end is located on the bottom wall of the partition 6: during the upward movement of the partition 6, when the space above the partition 6 is under high pressure, the gas in the space above the partition 6 and the liquid nitrogen flowing out of the storage basket 4 will exert pressure on the baffle 802, causing the baffle 802 to disengage from the bottom of the sleeve 801, thereby transferring the liquid nitrogen above the partition 6 to below the partition 6. When the cover 23 is opened and the storage basket 4 is taken out, the amount of liquid nitrogen volatilization is further reduced.

[0034] For the pressure relief valve 8 whose output end is located on the top wall of the partition 6: by setting the pressure relief valve 8 whose output end is located on the top wall of the partition 6, the resistance encountered by the partition 6 when it moves downward can be reduced when the support plate 3 enters the through hole, thus ensuring that the partition 6 can move normally.

[0035] like Figure 2 As shown, a third spring 17 that cooperates with the upper support plate 3 is evenly fixedly installed on the top wall of the storage basket 4.

[0036] When the upper storage basket 4 is taken out, the tray 3 used to support the removed storage basket 4 must still be fixed in the through hole before the opening 22 is sealed with the cover 23 in order to prevent liquid nitrogen from evaporating.

[0037] After the cap 23 is installed in the opening 22, the electromagnet 14 is de-energized. At this time, the tray 3 falls out of the through hole and lands on the surface of the adjacent storage basket 4 below. Under the buffering effect of the third spring 17, the impact force on the storage basket 4 is reduced, thereby preventing the reagent bottle 5 from shaking. At the same time, the tray 3 is released by directly de-energizing the electromagnet 14, which reduces the operation steps and improves the convenience of use.

[0038] When it is necessary to remove the storage basket 4 located below the top tray 3 again, the partition 6 is moved to the surface of the bottom tray 3 of the corresponding storage basket 4 by the output end of the telescopic rod, and the locking rod 11 on the side wall of the tray 3 is aligned with the locking groove 9. Then, the electromagnet 14 is energized to fix the tray 3 and the partition 6 together.

[0039] Then, control the telescopic rod to retract, which will move the storage basket 4 and the tray 3 located above the storage basket 4 upwards, making it easier for staff to remove the tray 3.

[0040] like Figure 2 As shown, a limit sleeve 18 is vertically fixedly installed on the inner top wall of tank 1.

[0041] During the retraction of the electric telescopic rod 7, the storage basket 4 is driven into the limiting sleeve 18 through the partition 6 and the support plate 3.

[0042] When the partition 6 moves upward to its maximum extent, the bottom wall of the limiting sleeve 18 fits against the top wall of the partition 6, thereby reducing the amount of heat exchange between the inside of the tank 1 and the outside when the staff takes out the storage basket 4, preventing a large amount of outside gas from entering the tank 1, and thus reducing the amount of liquid nitrogen volatilization in the tank 1.

[0043] like Figure 4 , Figure 5As shown, a mounting groove is provided on the top wall of the pallet 3, and a mounting hole is provided vertically on the bottom wall of the mounting groove. A top rod 19 is vertically slidably inserted into the mounting hole. A top plate 20 is slidably installed in the mounting groove and fixedly connected to the bottom wall of the top rod 19. A second driving mechanism for driving the top plate 20 to move upward is provided on the tank body 1.

[0044] The second driving mechanism includes a bar magnet 21 fixedly installed on the inner wall of the limiting sleeve 18, and a push rod 19 made of magnetic material, with the top end of the push rod 19 attracting the bottom end of the bar magnet 21.

[0045] When the electric telescopic rod 7 is in the extended state, under the action of gravity, the top rod 19 is in the retracted mounting hole state, and the top wall of the top plate 20 and the top wall of the support plate 3 are on the same plane.

[0046] As the electric telescopic rod 7 retracts, the distance between the bar magnet 21 and the top rod 19 gradually decreases. When the partition 6 is in contact with the bottom wall of the limiting sleeve 18, the top rod 19 moves upward under the attraction between the bar magnet 21 and the top rod 19, and drives the storage basket 4 to move upward through the top plate 20. This makes it easier for staff to take out the storage basket 4 when the cover 23 is opened, shortens the time required to take out the storage basket 4, reduces the heat exchange between the inside of the tank 1 and the outside air, and reduces the amount of liquid nitrogen volatilized in the tank 1.

[0047] like Figure 6 As shown, the mounting bracket 2 includes a base 201 and four guide rods 202. The guide rods 202 are vertically fixed on the top wall of the base 201 and are evenly distributed around the circumference. Since the storage basket 4 is placed only on the surface of the tray 3, by setting multiple circumferentially distributed guide rods 202, the storage basket 4 can be placed between multiple guide rods 202, restricting the position of the storage basket 4 and preventing the storage basket 4 from falling off the surface of the tray 3.

[0048] Instructions for use: First, place the tray 3 onto the mounting frame 2, then place the storage basket 4 on the top wall of each tray 3, and place the reagent bottle 5 containing stem cells into the storage basket 4.

[0049] Then, liquid nitrogen is injected into the tank 1, and the mounting bracket 2 with the tray 3 and the storage basket 4 is placed into the tank 1. The opening 22 of the tank 1 is then sealed with the cap 23.

[0050] When taking out the sample, the telescopic rod is activated first, and the output end of the telescopic rod drives the partition 6 to move down. When the partition 6 moves down and is fitted outside the tray 3, the slot 9 is aligned with the rod 11.

[0051] Then, the electromagnet 14 is energized. At this time, the electromagnet 14 is aligned with the first permanent magnet 12. Under the attraction between the electromagnet 14 and the first permanent magnet 12, the first permanent magnet 12 drives the locking rod 11 to insert into the locking slot 9. The first spring 13 is gradually stretched, so that the partition 6 and the support plate 3 can be fixed together through the cooperation of the locking rod 11 and the locking slot 9. Then, the telescopic rod is controlled to retract. During this process, the low-temperature air above the partition 6 in the tank 1 is discharged into the space below the partition 6 through the pressure relief valve 8, thereby reducing the amount of cold air loss when the cover 23 is opened. Until the partition 6 moves the storage basket 4 on the surface of the tray 3 into the opening 22, the cover 23 is opened, the storage basket 4 on the surface of the tray 3 is taken out, and the tray 3 is still fixed to the partition 6 to prevent liquid nitrogen from directly contacting the outside air.

[0052] During the process of the partition 6 moving the storage basket 4 upwards via the tray 3 and opening the cover 23 to remove the storage basket 4, the partition 6 and the tray 3, made of heat-insulating material, prevent the liquid nitrogen located below the partition 6 from directly contacting the outside air, reducing the probability of liquid nitrogen absorbing heat and preventing liquid nitrogen from evaporating, thus saving costs.

[0053] When the upper storage basket 4 is taken out, the tray 3 used to support the removed storage basket 4 must still be fixed in the through hole before the opening 22 is sealed with the cover 23 in order to prevent liquid nitrogen from evaporating.

[0054] After the cap 23 is installed in the opening 22, the electromagnet 14 is de-energized. At this time, the tray 3 falls out of the through hole and lands on the surface of the adjacent storage basket 4 below. Under the buffering effect of the third spring 17, the impact force on the storage basket 4 is reduced, thereby preventing the reagent bottle 5 from shaking. At the same time, the tray 3 is released by directly de-energizing the electromagnet 14, which reduces the operation steps and improves the convenience of use.

[0055] When it is necessary to remove the storage basket 4 located below the top tray 3 again, the partition 6 is moved to the surface of the bottom tray 3 of the corresponding storage basket 4 by the output end of the telescopic rod, and the locking rod 11 on the side wall of the tray 3 is aligned with the locking groove 9. Then, the electromagnet 14 is energized to fix the tray 3 and the partition 6 together.

[0056] Then, the telescopic rod is controlled to retract, which moves the storage basket 4 and the tray 3 above it upwards, making it easier for staff to remove the tray 3. During the retraction of the electric telescopic rod 7, the storage basket 4 is moved into the limiting sleeve 18 through the partition 6 and the tray 3.

[0057] When the partition 6 moves upward to its maximum extent, the bottom wall of the limiting sleeve 18 fits against the top wall of the partition 6, thereby reducing the amount of heat exchange between the inside of the tank 1 and the outside when the staff removes the storage basket 4, preventing a large amount of outside gas from entering the tank 1, and thus reducing the amount of liquid nitrogen volatilization inside the tank 1. When the electric telescopic rod 7 is in the extended state, under the action of gravity, the top rod 19 is in the retracted mounting hole state, and the top wall of the top plate 20 and the top wall of the support plate 3 are on the same plane.

[0058] As the electric telescopic rod 7 retracts, the distance between the bar magnet 21 and the top rod 19 gradually decreases. When the partition 6 is in contact with the bottom wall of the limiting sleeve 18, the top rod 19 moves upward under the attraction between the bar magnet 21 and the top rod 19, and drives the storage basket 4 to move upward through the top plate 20. This makes it easier for staff to take out the storage basket 4 when the cover 23 is opened, shortens the time required to take out the storage basket 4, reduces the heat exchange between the inside of the tank 1 and the outside air, and reduces the amount of liquid nitrogen volatilized in the tank 1.

[0059] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A stem cell storage, preservation, and extraction device, comprising a tank (1); Its features are: It also includes a mounting bracket (2) and a tray (3), wherein the surface of the tray (3) is evenly provided with holes (15), and the tray (3) is fitted onto the mounting bracket (2) through the holes (15); A tray (3) is evenly slidably mounted on the mounting frame (2), and a storage basket (4) is detachably mounted on the top wall of the tray (3), and a reagent bottle (5) is placed in the storage basket (4). A partition (6) is slidably installed inside the tank (1). A through hole is provided on the top wall of the partition (6), and the through hole cooperates with the support plate (3). An electric telescopic rod (7) with its output end fixedly connected to the partition plate (6) is fixedly inserted into the inner top wall of the tank (1). Furthermore, the partition plate (6) is provided with a fixing mechanism for fixing the tray (3) in the through hole; Two pressure relief valves (8) are embedded in the partition (6), and the output ends of the two pressure relief valves (8) are located on the top wall and bottom wall of the partition (6), respectively.

2. The stem cell storage, preservation, and extraction device according to claim 1, characterized in that: The fixing mechanism includes a slot (9) opened on the side wall of the through hole; an insertion hole (10) is opened on the side wall of the support plate (3), a locking rod (11) that cooperates with the slot (9) is slidably installed in the insertion hole (10), and a first driving mechanism for driving the locking rod (11) to move is provided on the partition plate (6).

3. The stem cell storage, preservation, and extraction device according to claim 2, characterized in that: The first driving mechanism includes a first permanent magnet (12) fixedly installed on the side wall of the lever (11), and a first spring (13) fixedly installed between the lever (11) and the side wall of the insertion hole (10). The partition (6) has a cavity, and the cavity contains an electromagnet (14) that attracts the first permanent magnet (12).

4. The stem cell storage, preservation, and extraction device according to claim 3, characterized in that: The surface of the storage basket (4) is evenly provided with holes (15), and the top wall of the tray (3) is provided with a flow guide groove (16).

5. The stem cell storage, preservation, and extraction device according to claim 4, characterized in that: The pressure relief valve (8) includes a sleeve (801), a second spring (803), and a baffle (802); The sleeve (801) is fixedly embedded in the partition plate (6), and the two ends of the sleeve (801) are the input end and the output end, respectively; The baffle (802) is hinged to the output end of the sleeve (801); The two ends of the second spring (803) are fixedly connected to the inner wall of the sleeve (801) and the top wall of the baffle (802), respectively.

6. The stem cell storage, preservation, and extraction device according to claim 5, characterized in that: The storage basket (4) has a third spring (17) that is evenly fixed on the top wall and cooperates with the upper support plate (3).

7. A stem cell storage, preservation, and extraction device according to claim 6, characterized in that: A limiting sleeve (18) is vertically fixedly installed on the inner top wall of the tank (1).

8. A stem cell storage, preservation, and extraction device according to claim 6, characterized in that: The top wall of the pallet (3) is provided with an installation groove, the bottom wall of the installation groove is provided with a vertical installation hole, a top rod (19) is vertically slidably inserted into the installation hole, a top plate (20) is slidably installed in the installation groove and fixedly connected to the bottom wall and the top rod (19), and the tank body (1) is provided with a second driving mechanism for driving the top plate (20) to move upward.

9. A stem cell storage, preservation, and extraction device according to claim 8, characterized in that: The second driving mechanism includes a bar magnet (21) fixedly installed on the inner wall of the limiting sleeve (18), the top rod (19) is made of magnetic material, and the top end of the top rod (19) attracts the bottom end of the bar magnet (21).

10. A stem cell storage, preservation, and extraction device according to claim 1, characterized in that: The mounting bracket (2) includes a base (201) and four guide rods (202). The guide rods (202) are vertically fixed on the top wall of the base (201) and are evenly distributed in a circular pattern.

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