A computational multilayer model to simulate hollow needle insertion into biological porcine liver tissue.

Modelling of needle insertion in soft tissue has developed significant interest in recent years due to its application in robot-assisted minimally invasive surgeries such as biopsies and brachytherapy. However, this type of surgery requires real-time feedback and processing which complex computational models may not be able to provide. In contrast to the existing mechanics-based kinetic models, a simple multilayer tissue model using a Coupled Eulerian Lagrangian based Finite Element method has been developed using the dynamic principle.

Irish and Turkish pre-service teachers understanding and perceptions of enterprise education.

While many of its roots are derived from business contexts, enterprise education is evolving, and interest in its impact on initial teacher education is increasing. While common goals exist across regions, practices tend to differ. The perceptions of pre-service teachers who have been exposed to enterprise education in different countries can provide important clues about developing entrepreneurial teachers through their initial teacher education.

Bevel angle study of flexible hollow needle insertion into biological mimetic soft-gel: Simulation and experimental validation.

Background: A thorough understanding of cutting-edge geometry and cutting forces of hollow biopsy needles are required to optimise needle tip design to improve fine needle aspiration procedures.

Objectives: To incorporate the dynamics of needle motion in a model for flexible hollow bevel tipped needle insertion into a biological mimetic soft-gel using parameters obtained from experimental work. Additionally, the models will be verified against corresponding needle insertion experiments.

Simulation of biopsy bevel-tipped needle insertion into soft-gel.

Planning and practice of surgical procedures can be improved through the use of modelling. This study provides an insight into the biopsy needle (i.e.

Looped ends versus open ends braided stent: A comparison of the mechanical behaviour using analytical and numerical methods.

The present study has two major purposes: firstly, to investigate whether the analytical model proposed by Jedwab and Clerc for assessing the mechanical behaviour of an open ends metallic braided stent is applicable to the looped ends stent design and secondly, to compare the response of the two stent designs subjected to radial compression. We use finite element analysis to evaluate the performance of the two braided stents emulating well established designs: WALLSTENT and WallFlex. We validate the WALLSTENT model analytically.