As one of the fundamental researches for the development of microexplosion lithotripsy, amino acid analyses were performed on 12 dry urinary calculi. The results are as follows:
1) The weight of protein in dry calculi was from 0.53 to 3.15%. The mean was 1.6%.
2) Almost all amino acids in calculi were assumed to be the components of protein.
3) Regardless of inorganic component, calcigerous calculi had a similar pattern of amino acid composition, while uric acid calculus had a quite different pattern.
4) If protein should be added as to the materials to make a calculus model, fibrin would be the best from various points of view.
