Relation between tensile tests and compliance in polyester textile vascular prostheses

Area of Science:

• Biomaterials Science
• Mechanical Engineering
• Vascular Surgery

Background:

• Vascular prosthesis (VP) compliance is a critical mechanical property influencing performance.
• Standardized mechanical tests are needed to characterize VP compliance.

Purpose of the Study:

• To characterize textile vascular prosthesis (VP) compliance using standardized mechanical tests.
• To evaluate the relationship between material properties and VP compliance.

Main Methods:

• Longitudinal and circumferential traction tests were performed on three knitted VP models.
• Young's modulus was calculated to indirectly assess VP compliance.
• Actual compliance was measured under controlled intraluminal pressure and temperature (37°C).

Main Results:

• Variations in Young's modulus correlated with differences in radial, longitudinal, and volume compliance.
• A general link was observed between the Young's modulus of graft materials and their compliance properties.
• Differences in compliance were noted among the tested VP models.

Conclusions:

• Unidirectional standard mechanical tests, like measuring Young's modulus, can aid in predicting VP compliance.
• The predictive capability of these tests is limited due to the multidirectional stresses VPs experience ex vivo.