Abstract: A pressure relief valve for a blood pressure measuring instrument which is provided with a discharge mechanism for selectively discharging a small or large amount of compressed air. The discharge mechanism of simple structure is constituted from a small number of members including a valve member, a spring, an adjustment screw plug and a push button. A cuff pressure is automatically reduced at the predetermined reducing rate by rotating the adjustment screw plug during the measurement of blood pressure. Pushing of the push button also makes it possible to discharge at once the remaining cuff pressure after the measurement of blood pressure.

Abstract: Device for use in measurement of blood pressure, according to the intermediate blood pressure measuring method of RIVA ROCCI, which detects negative signals of Korotkoff sound pulses comprised in asymmetrical alternating current signal waves coming from a ceramic microphone through a band pass filter and a half-wave rectifier, and indicates the presence of the Korotkoff sound after shaping the negative signals in a monostable multivibrator.

Abstract: A sphygmomanometer cuff adapted to be easily applicable to any limb of a patient by himself. The cuff comprises an elongated flexible double layered fabric strap holding an inflatable pouch with tubes to be connected at the outside of the strap to a sphygmomanometer and to an air pump, and having a length sufficient to wrap by about one and a half to two turns round the patient's limb. A loop shaped rigid member is fitted at one longitudinal end of the strap, and received in the other longitudinal end thereof is a resiliently compressible rod like member. The rod like member can be forced through the loop shaped rigid member and prevents the strap from withdrawing from the loop shaped rigid member. A pair of female and male adhesive tapes are provided on the strap and are spaced apart by a distance permitting superimposing for fastening when the strap is wrapped round a patient's limb so as to stop the flow of blood through the arteries.