Omnidirectional Malleable Ring Retractor: New Approach to Retraction During Carotid Endarterectomy

To resolve problems with retraction instruments in order to obtain shallow and flat operative field in procedures such as carotid endarterectomy, we developed a new malleable tin alloy omnidirectional retraction supporting (ORS) ring. The new ORS ring has an ellipse-shaped (major axis: 275 mm; minor axis: 192 mm) bar frame (4 mm × 6 mm). The bar has 22 equidistant outward protrusions (length, 12 mm; diameter, 2.5 mm). The frame is made of tin...