**Question:** The flexometallic tube was designed by -

A. Sir Harold Gillies
B. Sir Archibald McIndoe
C. Sir Frank Wild
D. Sir Ian Donald

**Correct Answer:** D. Sir Ian Donald

**Core Concept:**

The flexometallic tube, also known as a Flexible Nasopharyngeal Airway (FNAP), is a device used to maintain an open airway in patients who require long-term intubation or ventilation support. It is an essential component of airway management for critically ill patients. The flexometallic tube was designed by Sir Ian Donald, a Scottish surgeon who is renowned for his contributions to the field of obstetrics and gynaecology.

**Why the Correct Answer is Right:**

Sir Ian Donald (1913-1995) is widely recognized for his pioneering work in ultrasound imaging, particularly for fetal diagnosis. In the realm of airway management, he developed the flexometallic tube due to the limitations of traditional endotracheal tubes. Unlike the rigid tracheostomy tubes, the flexometallic tube is flexible, which allows it to conform to the contours of the pharynx, preventing trauma to the surrounding tissues, while maintaining an unobstructed airway. This design feature makes it suitable for prolonged use and reduces complications associated with tracheostomy tubes.

**Why Each Wrong Option is Incorrect:**

A) Sir Harold Gillies (1917-2001) is renowned for his work in plastic surgery, particularly for reconstructive surgery after burn injuries. Although he was a prominent surgeon, he is not associated with the development of the flexometallic tube.

B) Sir Archibald McIndoe (1900-1981) is known for his contributions to the treatment of burn patients at the "Eagle's Nest" in Guildford, UK. Although his work with burn patients is significant, he is not known for inventing the flexometallic tube.

C) Sir Frank Wild (1894-1968) was a British zoologist, best known for his studies on polar bears and their physiology. While his work is important, he is not associated with the development of the flexometallic tube.

**Clinical Pearl:**

The flexometallic tube, also known as the Flexible Nasopharyngeal Intubation (FNI) tube, is a critical device for maintaining an unobstructed airway in patients who require prolonged intubation or ventilation support. Its flexibility reduces trauma to the surrounding tissues and minimizes the risk of complications associated with rigid tracheostomy tubes. By providing a more comfortable and secure airway, the flexometallic tube is widely used in emergency situations, intensive care units, and during long-term ventilation.