Reusable 3D Printed Model for Prenatal Ultrasound-Guided Needle Procedures

Today's OBGYN trainees face limitations for diagnostic procedural opportunities in the advent of accessible non-invasive prenatal testing. Decreased volume minimizes trainee experience and may increase complication risk. High-fidelity simulation demonstrates promise in promoting skill and confidence in adult learners. Previously, ultrasound-guided needle procedure simulators have been cost prohibitive for widespread use. Our objective was to design an affordable and reusable simulation model for ultrasound-guided needle procedures to facilitate high-fidelity training for obstetrics and gynecology residents and fellows. Collaborating with the Department of Biomedical Engineering, key needs of a realistic training model were identified: compatibility with ultrasound, tactile realism, realistic biomechanics, anatomical size and realism, and capacity for repeat use. Using established averages on anatomical measurements, echogenicity, and tissue properties (density, elasticity, and viscosity), realistic and cost-effective synthetic materials were created for model design. Anatomic and imaging accuracy were achieved with a 3D printed housing base and individual silicone layers. Silicone layers were designed to mimic abdominal wall and uterine layers with accurate ultrasound intensities and compression testing. Repeat use testing demonstrated a decrease in compression fidelity noted at approximately 60 pokes. Expert user feedback was positive and confirmed key needs were met. Initial model cost is $200 and replacement layer costs total $30. Leveraging technology for trainee simulation is a promising area for medical education. There is a need for high-fidelity and cost-effective models. These types of models have potential to build learner confidence and skill, as well as limit procedural complications, especially for decreasing volume procedures, such as diagnostic needle procedures. We demonstrate here an affordable, reproducible, medically accurate prenatal diagnostic procedure model.View Large Image Figure ViewerDownload Hi-res image Download (PPT)