SU1646542A1 - Tone transducer - Google Patents

Abstract

The invention relates to medical technology, in particular to a technique for measuring blood pressure of the Korotkov method. The purpose of the invention is to reduce vibration interference of the sensor of Korotkovo tones. The sensor includes a housing 1 with two axially located lids 2, 3, on the inner sides of which are mounted piezoelectric elements 4, 5, connected between each other by the opposite electrodes connected to the common wire, and the second opposite electrodes of the piezo elements are connected to each other and connected to the matching device. The front piezoelectric elements 6, 7 are located on the covers of the concentric disk piezoelements, the polarity of which is opposite to the polarity of the corresponding disk piezoelement electrodes. The areas of the disk piezoelectric elements are equal to the area of the circular piezoelectric elements. 3 il. 3 wats

Description

(The invention relates to medical technology and is intended to indicate Toyotas SHORT when measuring blood pressure according to the method of 5 Korotkovas

The purpose of the invention is to reduce vibration noise

Fig. O1 shows the construction of the tone sensor J in Fig. 2 — the arrangement of the ω 1 piezoelectric elements on the covers; Fig. 3 is a diagram of the effect on the tone sensor, located under the compression cuff, of the signal of Korotkov tones, of the in-phase (P.-) and vibration (P3p) 15 interference

The tone sensor includes a housing 1, a front 2 and a rear 3 cover with disk 4 and 5 and ring 6 and 7 piezo elements fixed to them0 20

Piezo elements 4-7 are fixed on covers 2 and 3 on the side of opposite electrodes (FIG), which are connected to each other and to the common wire (through covers 2 and 3), and the opposite 25 electrodes of the piezo elements are also connected to each other and to the input of the matching device 8 (Fig2)

 The tone sensor works as follows, 30

The Tone Sensor is installed on the compression cuff on the inside of the human forearm. Sound vibrations occurring in the brow (PTR), (signal of Korotkov tones), common mode (Ps), and vibration (Rvp) interference (FIGS) o

Since the piezoelectric elements on the front and back cover are connected by opposite electrodes, the level of impact of Korotkov tones from the cuff side is less than the level of impact of Korotkov tones on the front cover, that is, from the side of the hand, and the vibration noise acting on the covers is the same a signal will be received with reduced vibration disturbance

Claims (1)

Invention Formula A tone sensor, comprising a housing with two axially located lids, on the inner, sides of which there are disk piezo elements, interconnected by different electrodes connected to a common wire, and the second different electrodes of the piezo elements are interconnected and connected to a matching device, different that, in order to suppress vibration noise, it is equipped with ring piezoelectric elements fixed on the covers of concentric disk piezoelectric elements with century when the pressure in the cuff changes, 35 ° ST RODS of the electrodes, the polarity of which is perceived by the covers 1 and 2 and converted by piezoelectric elements 4-7 into an electric signal, then arriving at the matching device 8 (Fig. 2) o40 During the measurements, the tone sensor is affected by the useful signal. opposite polarity of the corresponding electrodes of the disk piezo elements, which are connected to disk elements mounted on the corresponding covers, and the area of the disk piezoelectric elements is equal to the area of the annular (PTR), (signal of Korotkov tones), in-phase (Pn), and vibration (Rvp) interference (FIGSZ) o Since the piezoelectric elements on the front and back covers are connected by opposite electrodes, the level of Korotkov tones from the cuff side is less than the levels of Korotkov tones on the front cover, t0e „from the hand, and the vibration disturbances acting on the covers are the same, when the signals at the output of the matching device will receive a signal with reduced vibration interference Invention Formula A tone sensor, comprising a housing with two axially located lids, on the inner, sides of which there are disk piezo elements, interconnected by different electrodes connected to a common wire, and the second different electrodes of the piezo elements are interconnected and connected to a matching device, different that, in order to suppress vibration noise, it is equipped with ring piezoelectric elements fixed on the covers of concentric disk piezoelectric elements with ST ° RONY electrodes, polarity opposite polarity of the corresponding electrode of the piezoelectric disk, which are connected to the disk elements mounted on the respective covers, and the area of the piezoelectric disk is equal to the area of the annular FIG g output fig.Z forearm cuff t h them