Vacuum freeze-drying preserved cornea has not been reported at home and abroad. Sucrose is difficult to dry when dry. According to the mechanism of the protective agent, we chose dimethyl sulfoxide (DMSO) as the protective agent inside the membrane and albumin as the protective agent outside the membrane. The purpose of drying is to remove the moisture in the corneal cells. After vacuum freeze-drying, the cornea can be easily aseptically packaged for long-term storage.
The discharge of water during corneal drying is complicated. To ensure the activity of corneal cells in the drying process, controlling the temperature, pressure, and drying rate of the drying process are three important factors. After the cornea is freeze-dried, it needs rehydration before use. After the cornea is vacuum freeze-dried, the corneal tissue structure and cell morphology are preserved, but the water loss, various ions and many nutrients are lost, and the vacuum freeze-drying The rehydration of the cornea is definitely different from the rewarming of the cornea after cryogenic freezing. Experimental Study on Vacuum Freeze - drying of Cell Culture Medium and Preservation of Rabbit Corneal Endothelial Cells .
The main function of corneal endothelial cells is to regulate the moisture in the cornea and maintain the transparency of the cornea. The corneal epithelium and endothelium were intact, smooth, transparent and no shedding after vacuum rehydration and corneal rehydration, and the whole cornea was free from edema and transparency. Microscopically, the corneal endothelial cells are hexagonal with clear boundaries.
It is believed that the damage is mainly manifested by the cells being highly sensitive to mechanical or osmotic injury. Vacuum freeze-drying will cause greater damage to the endothelial cells of the cornea. Although the density and activity rate of the corneal endothelial cells after rehydration after vacuum freeze-drying is lower than that in the deep cryopreservation group, it is lower than normal rabbits, but it is still higher s level. Vacuum freeze-drying may cause greater damage to the endothelial cells of the cornea than cryogenic freezing. However, the results suggest that vacuum freeze-drying can maintain the activity of corneal endothelial cells. With the continuous improvement of the quality and performance of the vacuum freeze dryer, the gradual improvement of the structure, the corneal endothelial cell density and survival rate will increase, creating a long-term preservation of the cornea.
Adopting high standard in gelatinizing, the machine could cover various angles, curve, concave & convexity, slot, wrap border etc. which suit for construction material, furniture, table, window & door, decorative strip and relative factories .Complicated-shaped products surface could be turned into perfect impact.
Max film covering width:300mm heating power: 6kw
Max process thickness: 90mm overall dimensions:4000*600*1800mm
Min process length: 600mm weight:2500kgs
Feeding speed:0-35m/min max diameter of rolling cover material:400mm
Feeding motor power:1.5kw max width of cover film 600/850/1200mm
We have the following features:
1. Good quality quality is our culture
2. Fast service 24 hours answering service Vip service for you
3. Good reputation influence company
4. Quick after-sale service
5. Professional in this industry for 7 years
6. with us your money is safe,your business is safe.
7. We think our products will give you an edge over your competitors.
advantages of XINGBANG machine
NO items
1 the panel are made by CNC Gantry Milling,dimensions tolerance is under 0.05mm.
2 The shaft had a scale,which can control the size of workpiece.
3 All tubes and the guide bars are chromed with 0.03-0.05mm.
4 we adopt Magnetic brake in our control system,which is about RMB1000.while others use air brake or belt brake.
5 we use Aviation connector,which can be used for decades.
6 we use Bidirectional sophisticated glue knives.which made by Japanese material.
7 high-precision rolling guide are imported from taiwan.
8 excellent silicon gel wheels
9 all french Schneider brand electrical control system
10 each machine and compontes to be tested twice before shipment.(we have QC department)
11 our production aea about 10000 square meters.
12 we sell about 200sets woodworking machines each month.
13 our hot adhensive machines are NO 1 sales in domestic market,Quality stability has been recognized by the majority of our customers.
14 we have 10 Senior professional after-sale-service wrapping engineers all over the country,
15 PUR machine has the features of High efficiency, high speed, about 1-60m/miunute, suitable for mass production.
16 flexile frames,can save much space and save time.improve efficiency.
Wrapping Machine, Woodworking Machinery, PVC Adhesive Wrapping Machine
Shandong Qufu Xingbang Heavy Equipment Co., Ltd. , http://www.chinaxingbangheavyindustry.com