Studies in blood-pressure : physiological and clinical . nd unhookwith facility. The latter form of armlet is veryconvenient for applying the. pressure of the handover the armlet when the observer wishes toavoid constriction of the limb in sensitive subjects. For differential readings of the arterial pressurein the two arms, or forearms, or in the arm andthigh (in aortic insufficiency, etc.), two armletsare provided, furnished with a tap for each, andrubber tubes with a T-way piece ; the one adaptedto the thigh is larger, and of suitable dimensions. III. The Canvas BagA small short canvas bag
Studies in blood-pressure : physiological and clinical . nd unhookwith facility. The latter form of armlet is veryconvenient for applying the. pressure of the handover the armlet when the observer wishes toavoid constriction of the limb in sensitive subjects. For differential readings of the arterial pressurein the two arms, or forearms, or in the arm andthigh (in aortic insufficiency, etc.), two armletsare provided, furnished with a tap for each, andrubber tubes with a T-way piece ; the one adaptedto the thigh is larger, and of suitable dimensions. III. The Canvas BagA small short canvas bag (8 x 10 cm.) isemployed to ensure quick compression and decom-pression of the armlet. It is connected up betweenthe filler and the tubes leading to the armlet and APPARATUS 9 the manometer. The filler is furnished with atap as well as the valve inside, so that shouldthe latter become leaky, the observer is independentof this defect. IV. The Phonendoscope A sensitive phonendoscope (Fig. 3) is providedfor the efficient application of the auditory It is disc-shaped, of less than 3 cm. in diameter,and is fitted with a binaural rubber tube in onepiece, with ear plugs. For those who prefer afirmer fixture in the meatus than the plugs aloneafford, a head spring is made. When devising this little phonendoscope, Idiscovered that its maximum degree of sensitive- 10 STUDIES IN BLOOD-PBESSUBE ness depends on absolute air-tightness: a con-dition not found in other phonendoscopes. Thisimportant quality is lost even by the invisible prickof a needle passed through the rubber. Theobserver may easily test the air-tightness of theinstrument by suction of the entrance tube, afterwithdrawing from it the rubber tube, and thenclosing it with the tip of the tongue, when therubber cover will remain concave if the tambouris air-tight; but will not do so if the tambourrequires A stout rubber band, adjustable to all sizes ofarms, is provided for keeping the phonendoscopein situ with
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Keywords: ., bookcentury1900, bookdecade1910, bookid, booksubjectbloodpressure
