*7.3.7.1 Introduction*

The Combitube® (Covidien-Nellcor®, Pleaseton, USA) is a single use, doublelumen tube that combines the features of a conventional ETT with those of an oesophageal obturator airway.

*7.3.6 i-gel®*

**Table 5.**

**266**

**Figure 13.**

**Mask size**

*FOB guided intubation.*

*7.3.6.1 Introduction*

*Available Auragain LMAs.*

The i-gel® (Intersurgical®, UK) is the innovative second generation supraglottic airway device from Intersurgical launched in 2007. Made from a medical grade thermoplastic elastomer, i-gel has been designed to create a

**Patient weight Maximum cuff volume**

*Special Considerations in Human Airway Management*

**of air (ml)**

1 Neonates/infants up to 5 kg 4 6 3.5 1.5 Infants 5–10 kg 7 8 4 2 Infants/children 10–20 kg 10 10 5 2.5 Children 20–30 kg 14 10 5.5 3 Children 30–50 kg 20 16 6.5 4 Adults 50–70 kg 30 16 7.5 5 Adults 70–100 kg 40 16 8 6 Adults more than 100 kg 50 16 8

**Gastric tube size (French)**

**Largest ETT ID (mm)**

• A distal lumen and its smaller balloon cuff terminate in and seal the upper

**Mask size Patient weight Largest ETT ID (mm) Gastric tube size (French)**

 Neonates 2-5 kg 3 NA 1.5 Infants 5–12 kg 4 10 Infants/children 10–25 kg 5 12 2.5 Children 25–35 kg 5 12 Children, Small adult 30–60 kg 6 12 Adults 50–90 kg 7 12 Adults >90 kg 8 14

*Second Generation Supraglottic Airway (SGA) Devices DOI: http://dx.doi.org/10.5772/intechopen.93947*

The device commonly enters the oesophagus on insertion. Ventilation is achieved through multiple proximal apertures situated above the distal cuff (**Figure 16**). Both the proximal and distal cuffs have to be inflated to prevent air from escaping through the oesophagus. If the tube enters the trachea, ventilation is

oesophagus (in >90% of insertions)

achieved through the distal lumen.

**Table 6.**

**Figure 15.** *Combitube.*

**Figure 16.** *Combitube in-situ.*

**269**

*Available i-gel LMAs.*

## *7.3.7.2 Device description*

The Combitube® has the following parts (**Figure 15**):


*Second Generation Supraglottic Airway (SGA) Devices DOI: http://dx.doi.org/10.5772/intechopen.93947*


**Table 6.** *Available i-gel LMAs.*

**Figure 15.** *Combitube.*

• A distal lumen and its smaller balloon cuff terminate in and seal the upper oesophagus (in >90% of insertions)

The device commonly enters the oesophagus on insertion. Ventilation is achieved through multiple proximal apertures situated above the distal cuff (**Figure 16**). Both the proximal and distal cuffs have to be inflated to prevent air from escaping through the oesophagus. If the tube enters the trachea, ventilation is achieved through the distal lumen.

**Figure 16.** *Combitube in-situ.*

*7.3.7.2 Device description*

**Figure 14.** *Parts of i-gel.*

**268**

The Combitube® has the following parts (**Figure 15**):

*Special Considerations in Human Airway Management*

• A large proximal balloon cuff seals the hypopharynx

• A ventilating, proximal lumen terminates at side ports overlying the laryngeal inlet
