Date of manufacture:
Krohne & Sesemann, London
Junker's original inhaler was manufactured by Krohne and Sesemann who were themselves interested in anesthesia and both administered anaesthesia in London. There were many minor modifications to Junker's original design, several being made by Kohne and Sesemann. This example features a triple bulb air pump. The anaesthetist chose the appropriate bulb for the level of anaesthesia required. The air was delivered by a narrow rubber tube to the vaporiser bottle that contained the liquid. The air was passed down a metal tube that teminated below the liquid surface through which it bubbled. The anaesthetic-enriched air, containing chloroform vapour at high concentration was then delivered to a mask. The bottle vaporiser was kept upright by being hooked to the anaesthetist's lapel. The mask in this case is of large enclosed volume and has a portion of a feather hinged in the ventilation port. Its function is to move with breathing and thus to be a venilation monitor. The concentrated vapour from the bottle is diluted by the patient's breath. The catalogue illustration is of a simpler version. There were several incidents where the bottle was connected with its ports reversed so that pumping caused liquid anaesthetic to be pumped to the patient. There were also examples of liquid delivery when the bottle was tilted excessively. Consequently, most modifications sought to eliminate these complications.
Barbara Duncum, 'Development of Inhalation Anaesthesia', Wellcome, 1947.