Nonlinear Hyperelastic Analysis of a Pediatric Medication Port

JAR performed a nonlinear hyperelastic axisymmetric finite element analysis of the silicone septum, cap and partitioner of a prototype medication implant device. A Mooney-Rivlin strain energy function and ANSYS hyperelastic elements were used to simulate the elastomeric material behavior of the silicone septum.

Static loading representing the manufacturing process was applied in prescribed increments of displacement at the boundary of the septum. Resultant boundary pressure loadings developed in the analysis of the silicone septum were then applied to the plastic enclosure structures and welds, and a stress analysis performed, to verify that the septum remained in sufficient compression to seal off the reservoir after withdrawal of the needle.

Representative JAR Analysis and Design Projects