Device for influencing the rate of the pressure drop in a sphygmomanometer cuff

摘要

There is proposed a device for influencing the rate of the pressure drop in a sphygmomanometer cuff intended for measurement of the blood pressure by the Riva-Rocci method. The device comprises a valve (16) which is controllable by an electric motor (18) and which forms the adjustment member of an electronic controlling device (10) for generation of a selectable pressure drop characteristic. The valve and the electric motor which may be also coupled, if appropriate, to a gear (105), are fastened on a baseplate (101) at a specific mutual spacing. The motor shaft or drive shaft (106) projects freely through an opening (107) in the baseplate and is connected via a screw gear (106, 128) to one end of a spring element (123), the other end of which (124) is firmly connected to the baseplate via a spacer element (125). Between the spacer element and the screw gear an end of the valve cone (115) is in engagement with the spring element. The valve can be designed as a valve which is open or closed in the resting state. In a valve which is open in the resting state, a compression spring (120) ensures that the valve cone (115) is retracted from the valve opening (117) and acts upon the spring element via a pin (118) connected to the valve cone. <IMAGE>