This rarely seen item was used as a visual prop in Question 24.1 from the second paper of 2012. The candidates weren't expected to recognise it- the examiners were more interested in its uses, advantages and disadvantages.
Cannot use the dual lumen tube:
The college suggest the following:
To this I would add:
Janossy, K. M., et al. "The effect of pilot balloon design on estimation of safe tracheal tube cuff pressure." Anaesthesia 65.8 (2010): 785-791.
Hoffman, Robert J., Vivek Parwani, and In-Hei Hahn. "Experienced emergency medicine physicians cannot safely inflate or estimate endotracheal tube cuff pressure using standard techniques." The American journal of emergency medicine 24.2 (2006): 139-143.
Parwani, Vivek, et al. "Practicing paramedics cannot generate or estimate safe endotracheal tube cuff pressure using standard techniques." Prehospital Emergency Care 11.3 (2007): 307-311.