Table 2.

Examples of Original Design Features, Clinical Feedback for Improvement, and Final Product

Original Prusa Design	Clinical Feedback for Design Improvement	Final Design
Open gap between outer face shield envelope and user	limited fluid protection on top of visor when performing procedures (e.g., intubation)	added fin on top of the prototype headband and additional plastic lip to retain fluid and prevent it from obstructing face shield view
Single attachment point for face shield strap	difficulty attaching strap and suboptimal fit for different face types	used hook and loop Velcro to adapt each visor to individual users
240 mm width and 240 mm length for face shield outer envelope dimensions	original length not sufficiently protective for all user facial lengths and height	outer envelope length modified to be 240 mm wide and 305 mm long without obstructing hearing or access to ears for stethoscope
Anchor point for straps placed lateral to the headband	shield uncomfortable to wear for an extended time	anchor points for hook and loop strap placed in line with the headbands, reducing tightness