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Devices for oxygen supplementation.

Final positioning of supraglottic airway. (A) Laryngeal mask airway (LMA) slightly moved down to show direct seal over glottis, permitting pressures of 20–40 cm H₂O without pressurizing the stomach. Note that the practitioner must always verify that the device is past the base of the tongue to have adequate depth for creating a seal over the glottis. (B) Bronchoscope visualization of LMA centered over and sealing patient's glottis.

Bag-valve-mask with reservoir. Top left: Tubing is connected to an oxygen source with 15 L/min supplied to the device and entering the reservoir bag while the ventilation bag is compressed. When the ventilation bag is released, it expands and oxygen within the reservoir is sucked into the ventilation bag filling it with oxygen for the next compression. In some models the reservoir bag is replaced with tubing that functions similarly. Ventilation bag sizes vary from approximately 250 mL for neonates to approximately 500 mL for children and approximately 1500 mL for adults. Top right: It is recommended that bag-valve-mask (BVM) resuscitation bags are equipped with manometers that monitor ventilation pressure. Bottom left and right: One- and two-person BVM ventilations illustrate the proper mask seal using the so-called C-E technique. The mask is sealed with the thumb and first finger forming a “C” configuration over the mask, and the remaining fingers (“E”) are placed under the mandible enhancing the seal and pulling the head into a tilted position.

The comparison of the CCD device and the CMOS device.

The length of the device with CCD camera.

The length of the device with CMOS camera.