微小発破の生体応用に関する研究 : 第2報尿路結石の組成と強度

概要

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As one of the fundamental researches for the development of microexplosion lithotripsy, chemical component, density, hardness, compressive strength, tensile strength and the modulus of elasticity were measured on 66 dry urinary calculi. The results are as follows: 1) Chemical component was not so different from that of former reports. 2) Density was from 0.97 g/ml to 1.75 g/ml. 3) Hardness was from 12.5 H_RF to 102.5 H_RF. 4) Compressive strength was from 19.0 kg/cm^2 to 176.0 kg/cm^2. 5) Tensile strength was from 0.8 kg/cm^2 to 34.3 kg/cm^2. 6) A direct proportion was observed between the compressive and the tensile strength of calculi. 7) The modulus of elastisity was 5.4×10^8 dyne/cm^2 to 88.0×10^8 dyne/cm^2. 8) Almost no correlation was observed between the strength of calculi and their chemical component. Laminated calculi, however, were weaker than non-laminated one in most cases. 9) Urinary calculi could be classified into two groups according to their strength at the border of 65 kg/cm^2 in compressive strength and of 15 kg/cm^2 in tensile strength by dry sample. Approximately 80-90% of all calculi might belong to the "low strength calculus" group of which strength was under the borderline and the remaining 10-20% might belong to the "high strength calculus" group of which strength was over the borderline.
社団法人日本泌尿器科学会の論文