There is described a method for cerebral circulatory standstill by means of an isolated intra vital sink of cerebral vessels with Kallocryl C and it is compared with other methods. This methods is the most suitable model. Indeed it is connected with only a single response of the circulatory system in contrast to the most frequent clinical progresses. The final condition, however, corresponds to the isolated brain death of the organ donor. Long time examinations are possible.