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Warming

The osmotic pressure had a change that caused excessive swelling (hypercondensation) of embryos and eggs, and the damage to cells and cytoskeleton was a major problem during thawing process. The cryotech method minimizes the osmotic pressure difference of the solutions and increases the viscosity by adding HPC to achieve very safe and slow dilution.

Features of the melt

  • By adding the optimal amount of HPC, the viscosity of the liquid increases and the change in osmotic pressure reducess.
  • The speed of dehydration and condensate adjusts to ensure safe recovery, eliminating completley the damage.

Products

Materials

  • Warming Solution (TS) :1 vial of 1.8ml
  • Diluent Solution (DS) :1 vial of 0.5ml
  • Washing Solution (WS) :1 vial of 1.0ml
  • 1 Warming Plate with 4 wells
  • Microscope (Turn off the heating plate)
  • Stop watch (With count up function) Tweezers
  • Micro pipette for 300μ

Preparation

Warming (1 MIN)

  1. Take the TS vial out of the incubator, and expel all of the solution out of it into the TS well (1.8ml, Fig. 8, Step1/1)
  2. Quickly (within 1 sec) put the Vitrification method from liquid nitrogen into the TS well (Fig. 8, Step1/2). Start counting up by the stop watch for 1 min.
  3. The oocyte/embryo releases from the Vitrification method sheet by itself, and begins

Figs. 8 Warming Procedure (Step 1-3)

Dilute Solution (30-40 SEC)
  1. Aspirate the oocyte/embryo first, followed by 3mm of the TS into the pipette (Fig. 9, 1).
  2. Introduce the TS to the bottom of the DS well (Fig. 9, 2), then expel the oocyte/embryo slowly to the bottom of TS layer in DS well (Fig. 9, 3), and wait for 3 min (Fig. 8, Step 2/1).
  3. While waiting, fill the WS1 and the WS2 well with 300μl each of ws Solution (Fig. 8, Step 3/1).

Step 1

Step 2

Step 3

Washing (5 MIN)

  1. Aspirate the oocyte/embryo followed by 3mm of the DS into the pipette (Fig. 10,1).
  2. Introduce the DS to the bottom of the WS1 (Fig. 10, 2), and expel the oocyte/embryo slowly to the bottom of the DS layer in WS1 well (Fig. 10.3). Observe the shape of the oocyte/embryo and memorize it. Turn off the light, and wait for more than 3 min.
  3. After 3 min, compare the shape of the oocyte/embryo to the one memorized. Give a survival judgment if the shrinkage of the oocyte is recovered.
  4. Wait for 5 min in total (Fig. 8, Step3/2).

Step 1

Step 2

Step 3

Washing (1 MIN)

  1. Aspirate the oocyte/embryo with minimal volume of the WS1.
  2. Put the oocyte/embryo on the surface of the WS2 well (Fig. 8, Step3/3).
  3. After the oocyte/embryo sinks to the bottom, aspirate and place it on the surface of a different location with in W2. Put the oocyte/embryo into the droplet of the culture media until ICSI or ET is performed.
  4. (Two to four hours culture for ICSI, and 3 hours for blastocyst transfer are recommended

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