It was invented by our patients. This is a situation when we give our own ovaries "the last chance" but also secure our success with donor oocytes that are de-frozen on the day of the patient's puncture. This means that in one history of embryo transfer we use a larger number of oocytes that will give us a larger number of embryos. Of course, the priority is given to the patient's own oocytes and embryos that are usually transferred in the given stimulation cycle. The donor's embryos can be vitrified or can be used in the same cycle. It is up to the patient to decide.