Size

Tubes are manufactured in a wide variety of sizes. PVC tracheostomy tubes are sized according to their inner diameter (ID) and outer diameter (OD), expressed in millimeters. The size is denoted on the neck flange of the tube. The metal Jackson and Shiley cannula tubes are sized according to an older system, the Jackson equivalent number. There exists a conversion between sizes; for example, a Shiley no. 6 equals a no. 7.0 mm internal diameter. To eliminate confusion, one should select tubes according to the internal diameter. In general, with plastic materials, there are approximately 3 mm of wall thickness between the inner and outer cannula (Table 38-1). Adult tracheostomy tubes range in size from 4.0 mm ID to 12.0 mm ID.

Peripheral Neuropathy Natural Treatment Options

Peripheral Neuropathy Natural Treatment Options

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