| 摘要 |
<p>PURPOSE: To make it possible to provide a compact sphygmomanometer with simple structure, by making the cuff presure control mechanism be composed of one or a plural number of valves and controlling valve operation using control elements so that the valves should work at pulse frequency higher than that of the heart. CONSTITUTION: Pump 1 is connected to a cuff 3 through a tube 2. The tube 2 is fitted to a valve 4 for the reduction of pressure. The valve 4 is controlled by a control element 5 which operates according to detection signal from a pressure sensor 6. The control element 5 also controls the operation of pump 1. The pump 1 is used to supply a sufficiently high pressure in cuff 3. As the pressure reduces, the pulse-controlled high-speed valve 4 opens and closes repeatedly several times during a blood pressure testing cycle. By using the valve-regulating control element 5, it is possible to regulate the pressure drop of the cuff 3 in a completely linear manner. The pressure drop rate can be optionally controlled by means of the control element 5 which regulates valve 4.</p> |
