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My improved gravity apparatus for the intravenous injection of salvarsan seems to overcome and solve many of the difficulties which, as reports have shown, are connected with this method. The aim is to avoid getting any of the solution into the subcutaneous tissues before the needle enters the lumen of the vein. The several syringes and forms of air-pressure apparatus already on the market have proved far from satisfactory, and leave much to be desired in the way of a perfect technic. My apparatus is portable, can be disconnected in all parts of the stand, and by a thumb-screw allows of lowering and elevating the containers to any desired level, so as to control the rapidity of the flow of the solution into the vein. No solution which is not absolutely clear and sterile should be introduced into a vein. Clearness is to be obtained only by filtration through sterile
BOEHM JL. AN IMPROVED GRAVITY APPARATUS FOR THE INTRAVENOUS INJECTION OF SALVAESAN. JAMA. 1911;LVI(10):732-733. doi:10.1001/jama.1911.02560100024009