| 摘要 |
<p>DEPARTMENT OF COMMERCE UNITED STATES PATENT OFFICE VOLUME SENSING CUFF INFLATION MEANS FOR DETERMINING BLOOD PRESSURE WITHOUT USE OF STETHOSCOPE OR TRANSDUCER A cuff having a rigid casing and inflatable diaphragm is slipped over a portion of the body of the user, preferably over a finger or thumb. The diaphragm is connected to a cylinder, such as a large diameter syringe. A plunger in the cylinder inflates the diaphragm. Because finger sizes vary, means is provided to determine the position of the plunger at which the diaphragm is in firm contact with the finger but applies no pressure to the skin, and a scale on the plunger is adjusted relative to that plunger position at "zero". The plunger is then slowly depressed and the position on the scale noted when the subject first notices a slight pulsing or throbbing sensation inside the cuff, such position corresponding to diastolic blood pressure. Use of a transducer, or even a stethoscope, has been found to be unnecessary. Similarly, as the plunger is depressed further, the position of the plunger relative to the scale is noted when the subject senses the disappearance of the pulse in the finger inside the cuff, this position corresponding to systolic blood pressure. The scale positions have previously been calibrated to a conventional manometer so that a direct reading of both systolic and diastolic pressures may be obtained. It has been found that most subjects can sense the onset and cassation of the conditions is his own blood vessels which give rise to KOROTKOFF sounds used in blood pressure determination without use of a stethoscope or any transducer and thus adequately read their own blood pressure using the simple means described.</p> |
