Fell O'Dwyer apparatus.

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Fell O'Dwyer apparatus. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.

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The photo demonstrates J O'Dwyer's contribution to making up the "Fell-O'Dwyer Apparatus": a metallic, right-angular, curved, oro-intralaryngeal device, featuring a conical head distally and two ports proximally: one for entry of the inflating gas from a Fell system of bellows and delivery tube; the other stopped by the operators finger, which could be removed rhythmically to allow intermittent exit of expired air. (Fell always emphasised the need to allow sufficient time for expiration). The conical shape of the head allowed the tube to wedge between the cords, thereby sealing off the respiratory tract, thereby allowing/facilitating IPPV but also preventing entry of blood, vomitus, etc, into the lungs; while the conical tip was so graduated, sized set of five would fit all variations in size of the larynx.

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