Rethinking Human Factors in Obesity: Development of Simulation and Physical Test Models of Human Soft Tissue to Study...

Area of Science:

• Biomedical Engineering
• Medical Device Development
• Human Factors Engineering

Background:

• Standardized autoinjector activation testing (ISO 11608-1) uses hard surfaces, which may not accurately reflect performance on soft human tissue.
• Obese patients often have softer injection sites due to unique anthropometric and viscoelastic properties.
• These soft tissue characteristics can significantly increase autoinjector activation forces, a factor not typically addressed in current testing.

Purpose of the Study:

• To develop advanced soft tissue simulation and physical testing methods for autoinjectors.
• To improve the accuracy and relevance of autoinjector activation testing.
• To ensure reliable device performance across diverse patient populations, including those with softer injection sites.

Main Methods:

• Development of novel soft tissue simulation models.
• Implementation of advanced physical testing protocols to mimic real-world injection scenarios.
• Evaluation of autoinjector forces on simulated soft tissues with varying viscoelastic properties.

Main Results:

• The developed methods successfully simulated the viscoelastic properties of soft injection sites.
• Testing revealed significantly higher autoinjector activation forces on simulated soft tissues compared to hard surfaces.
• The new methodology provides a more realistic assessment of autoinjector performance.

Conclusions:

• Current standardized autoinjector testing is insufficient for predicting performance on soft injection sites.
• Advanced simulation and physical testing are crucial for developing reliable autoinjectors for all patient types.
• This research advances autoinjector design by incorporating realistic soft tissue interactions.