In thoracic surgery in man, positive or negative pressure devices are rarely essential. Either pleural cavity or even the anterior mediastinum may be invaded without, as a rule, a fatality from operation pneumothorax. It is a source of satisfaction, however, to have available an apparatus capable of almost instantly removing the condition of pneumothorax.
In 19081 I devised an aspirating shield to be applied over the wound under such conditions. The present shield is modified by omitting the metal rim and glass window which interfered with accurate coaptation to the chest wall and substituting a simple inflated rubber rim in which is held a flexible celluloid window. The apparatus may be sterilized in the autoclave or in boiling water. A simple two-way cock connects the cavity of the shield at will with either the external air or a suitable vacuum tank. To overcome pneumothorax the shield is applied over the wound and the lever turned connecting the vacuum tank with the eavity of the shield until the lung
BABCOCK WW. A PNEUMATIC SHIELD FOR OPERATIONS ON THE LUNG. JAMA. 1910;55(1):11–12. doi:10.1001/jama.1910.04330010013005
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