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DESIGNED FOR THE SIMULTANEOUS DISPLACEMENT OF FLUIDS IN THE SPINE, JOINTS OR BODY CAVITIES, BY AIR OR OTHER GAS
With a view to making a more extensive application of the method of diagnosis in brain and cord lesions by means of radiography, after the displacement of cerebrospinal fluid by air, and also for the purpose of preventing discomfort or untoward effects on the patient as a result of such procedure, the author was stimulated to devise the apparatus described below.This apparatus may be used not only for the displacement of spinal fluid by the lumbar route, but also for the displacement of fluids in joints, or body cavities, as in certain pleural effusions and ascites.Essentially the apparatus consists of a small bore cannula placed within another cannula of larger bore; the two are connected to one cylinder; the larger bore cannula is for the passage of the fluid
Liberson F. APPARATUS FOR SIMULTANEOUS DISPLACEMENT. Arch NeurPsych. 1924;12(3):300–304. doi:10.1001/archneurpsyc.1924.02200030053005
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