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. 2021 Jun 16;34(5):560–565. doi: 10.1080/08998280.2021.1930487

Figure 2.

Figure 2.

Top. Cross-sections of five nasogastric tubes that could be used to deliver nutrition and medications to ICU patients: (a) Covidien Salem Sump – 16 Fr, silicone, dual lumen stomach tube, infusion lumen is not circular (see text); (b) Covidien Salem Sump – 16 Fr, polyvinyl chloride, dual lumen stomach tube, internal diameter ∼2.7 mm; (c) Covidien Salem Sump – 14 Fr, polyvinyl chloride, dual lumen stomach tube, internal diameter ∼2.5 mm; (d) Covidien Kangaroo – 14 Fr polyurethane feeding tube, internal diameter ∼3.3 mm; (e) Covidien Kangaroo – 12 Fr radiopaque polyurethane tube, internal diameter ∼2.7 mm. Bottom. Effect of increasing French size on the internal diameter of single and double lumen nasogastric tubes. Increasing the external diameter of single lumen tubes (left) is associated with a comparable fractional increase in internal diameter. Increasing the external diameter of double lumen Salem Sump tubes (right) results in relatively little increase in internal diameter.