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Configuration of an injection manometer, consisting of a 3-cm length of 100 μm i.d. plastic-clad silica tubing sealed into a glass tip (inset) to provide increased volume near the stylet. Before an injection, the manometer was filled with tracer solution. (Here, R-dextran was used for visibility). A 1- to 2-mm length was left unfilled at the distal end (right), which was sealed with a plug of quick-setting epoxy.
