Abstract
The need is obvious for a new lumbar-puncture needle which will accurately measure the cerebrospinal pressure, and which will permit the withdrawal of uncontamipated fluid from the spinal canal or the introduction of serum, anesthetics or other fluid with minimum manipulation. The instrument usually employed in America is the simple straight needle, the use of which always entails the loss of more or less cerebrospinal fluid before the trocar is withdrawn and a manometer attached for making a pressure-reading. This of itself not only makes the pressure-readings inaccurate, but soils the field of operation, especially when the patient is suffering from epidemic cerebrospinal or tuberculous meningitis. Many modifications of this apparatus have from time to time appeared. 1 In Germany, the three most popular needles in use are: 1. Quincke's apparatus which, according to Reichmann, when showing a reading of 120 mm., uses 8 c.c. cerebrospinal fluid. 2. Krausche's apparatus,
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