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Realizing the excessive number of sphygmomanometers already on the market, I felt some trepidation in designing the sphygmomanometer to be described. It was only after I had convinced myself that the very multiplicity of types was due to their faults and limitations, that I had the present model constructed.
Sphygmomanometers are mainly of two types: (1) the mercury manometers; (2) the spring manometers.
The disadvantage of the mercury manometer is chiefly the loss or distortion of the pulse-wave during transmission to the instrument. Either no pulsation is obtained, or at best there is a slow oscillation, entirely distorted in both character and duration by the inertia of the mercury. The truth of this statement can be readily proved by connecting rubber-tubing to the manometer and suddenly pinching it. The mercury will rise, then fall below its previous position, and will then oscillate for some time. A single impulse has been
BENDICK AJ. A NEW AIR-WATER SPHYGMOMANOMETER. JAMA. 1911;LVI(25):1873–1874. doi:10.1001/jama.1911.02560250009004
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