[The theory of microcirculation. 3: Role of blood pressure amplitude on tissue microcirculation]

The blood pressure amplitude of the pulsatile blood supply evokes elastic interactions in the tissue, in which the noncompressible tissue fluid functions as mediator of strength. The particular morphological structure round the tissue capillary gives rise to the suggestion that in the result of these interactions a tissue pump is working which supports the blood flow as well as the exchange of substances at the capillary wall. The effectiveness of this pump depends upon the blood pressure amplitude, the heart rate and upon the elastic tissue properties and can be regulated with changes of these parameters. With the help of a hydraulic model an engineer-technical solution is built up and tested which in analogy to the tissue structure functions as pump and shows the properties of elastic interactions mentioned.