Blood-pressure primer : the sphygmomanometer and its practical application / by Francis Ashley Faught.

  • Faught, Francis Ashley, 1881-1963.
Date:
1914
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    FECTED BY CONSTANT USE AND THAT READINGS BOTH UP AND DOWN ARE IDENTICAL. No Other ancroid can bear these tests. J. F. Prendergast, commenting upon the accuracy of the Faught Pocket Sphygmomanometer, states: "As FOR ACCURACY AND DURABILITY, THE WRITER HAS FOR THE PAST FOURTEEN MONTHS USED ONE ANEROID IN- STRUMENT, A Faught, and has forced it up to 450 MM. nearly TWO THOUSAND TIMES. AfTER THIS SEVERE TEST IT WAS COMPARED WITH A STANDARD MERCURY COLUMN AND FOUND AS ACCURATE AS AT THE ORIGINAL TEST. It IS STILL IN SPLENDID WORKING CONDITION, AND THE COMPRESSION DIAPHRAGMS ARE AS RESILIENT AS THE DAY IT LEFT THE PiLLING FAC- TORY. This is a test of the most severe character, AND ANY INSTRUMENT THAT WILL REMAIN ACCURATE WITH SUCH USAGE WILL LAST INDEFINITELY WITH ORDINARY USE." Fig. 7.—Faught Pocket Sphygmomanometer in Case. A very important and distinctive feature possessed by the Faught Pocket Sphygmomanometer and found
    in no other instrument of similar character is the abso- lute elimination of the so-called "fatigue of metal" which heretofore has interfered with the accuracy of all other aneroid instruments. By persistent experi- ment and painstaking study a material for the con- struction of the compression disks has been found which is not affected in any way by temperature or pressure variations. These tests can be repeated by anyone and the results will be the same. Try them and be convinced. The Arm-band is made of strong grey inelastic, but soft and flexible material, having between its layers a rubber bag 9 x5 inches. This measurement conforms to the requirements of Janeway and others, and has been found to give the most accurate readings under all conditions. Fig. 8.—Arm-band. The Faught Pocket Sphygnioinaiwiueter can be applied or removed in less than thirty seconds. The lime required to apply the instrument, make a careful observation of the pressure and remove it is less than consumed by any other form of sphygmomanometer on the market. Two years' experience with the Faught Pocket Sphygmomanometer has demonstrated conclusively
    the superiority of the internal mechanism of this in- strument as compared with all other types of aneroid. They have been found practically indestructible as well as uniformly correct. Many instruments in con- stant use—thousands of times—coming back for examination, are found to have retained their accur- acy when compared with the standard mercury column. Fig. 9.—Pocket Indicator. Actual size. For accuracy and sensitiveness, the Faught aneroid has all the advantages of the best mercurial instru- ments ; for compactness and durability it far surpasses them. It is practically indestructible, and is well adapted to use in the operating room and in private practice, as well as in hospital service.
    Reads up to 300 mm.—The dial, which is accurately graduated, reads in mm. Hg., as does the standard mercury column, each interval representing two mm., and ranges from zero to three hundred (Fig. 9). The dial also may be revolved without interfering with the internal mechanism, so that the pointer at rest can be adjusted to zero. Neither temperature nor atmospheric variation in any zvay affects the apparatus, since when at rest the pressure on both side of the pressure chambers is equalized. Fig. 10.—Clinical Pocket Sphygmomanometer. One-half actual size. Diameter of dial, ?>% inches. The latest development in sphygmomanometers is the "Faught Clinical." This instrument follows a new principle which has been fully tried during several years in the Faught Pocket Indicator, and which has been fully demonstrated to be the most desirable and accurate multiple chamber aneroid instrument yet designed. This instrument is shown in detail in Fig. 10.