Quantitative analysis of coated needles for ultrasound guided intervention

摘要

For ultrasound guided interventions, the visibility of needles is of crucial importance for accurate positioning. Standard needles are only visible when the angle between transmitted ultrasound and needle is around 90 degrees. Therefore, needles were coated with a polyethersulfone coating containing specially developed polymeric microcapsules. Three different sizes of capsules were used, 10–25 µm, 25–50 µm and 50–75 µm.