. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . ed their maximum, the externalpressure must be just equal to that within the blood-vessels; Tigerstedt. Lehrbuch d. Physiol, des Kreislaufes, Leipzig, 1893, p. 381, DEVELOPMENT OF SPHYGMOMANOMETEES 51 their walls, being thus reheved of any tension on either side,would execute their maximum oscillations. He proposed thisas a new criterion for the indirect
. The clinical study of blood-pressure : a guide to the use of the sphygmomanometer in medical, surgical, and obstetrical practice, with a summary of the experimental and clinical facts relating to the blood-pressure in health and in disease . ed their maximum, the externalpressure must be just equal to that within the blood-vessels; Tigerstedt. Lehrbuch d. Physiol, des Kreislaufes, Leipzig, 1893, p. 381, DEVELOPMENT OF SPHYGMOMANOMETEES 51 their walls, being thus reheved of any tension on either side,would execute their maximum oscillations. He proposed thisas a new criterion for the indirect measurementof blood-pressure; the external pressure atwhich maximum pulsation of the arterial wallsoccurs.^ Subsequent investigation has shown that this cor-responds with considerable accuracy to the diastohc first instrument of Marey was much elaborated byHiirthle at a later date. As his apparatus is verycumbersome and suited only to laboratory use, itneed not detain us here. b. Mareys Second Instrument.—Marey, however,devised a second, smaller form (Fig. 10), which re-ceived a single finger and transmitted the pulsa-tions direct to the mercury column; but the volumechanges in one finger proved too slight to give sat-. FiG. 10.—Maeeys second sphygmomanometer. isfactory readings. It was discarded until, in 1895, Mosso,using it as a basis, constructed his admirable laboratory sphyg-momanometer. c. Mossos Apparatus.^—The essential parts of this rathercomplicated apparatus, shown in Fig. 11, are: 1st, Four metaltubes (BB) enclosing loose rubber glove fingers, into which arethrust the two middle fingers of each hand. 2d, A recordingmercurial manometer (A) connecting with the tubes (BB)through the tube (D), filled with water. 3d, A pump (C),whose piston is slowly depressed by turning a crank. Thewhole apparatus is filled with water from the bottle (F), the For tracings illustrating this see Figs. 18 and 20. Mosso, A. Sphygmomanometre pour mesurer la pression du
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbloodpr, bookyear1904
