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Mechanical properties of Small-Diameter Vessels (SDV) are scarcely studied. The proposed Pressure-Volume (PV) system, developed to evaluate stress-strain (- behavior of SDV, allows the controlled variation of internal pressure and simulation of pressure-induced diameter changes of tubes. Measurements were taken from contrast-improved images captured for each internal pressure value. A circu- lar cross-section tube in equilibrium, with elastic wall and known pressures was assumed to determine circumferen- tial stress and strain. - curves were obtained and valida-

Un sistema presión-volumen para la medición de propiedades mecánicas de vasos cardíacos menores A Pressure-Volume System for Measuring Mechanical Properties of Small Diameter Vessels