RU2342067C1 - Device for arterial pressure measurement - Google Patents

Abstract

FIELD: medical technics.

SUBSTANCE: device contains case in form of watch, element of fastening of the case on the wrist of the user, made in form of bracelet with opportunity to reset its pulling to wrist, the gauge with the sensitive element made in form of resilient flat plate, fixed in the case of the gauge. Free end of a plate is fixed on the lateral surface of the cylinder freely placed in the case. The gauge is supplied by the fibre-optic converter of deformation of flexure of sensitive element. The device is supplied also with an element of the indication of the gauge position on the wrist, made in form of the dichromatic indicator electrically connected to the measured information analysis block.

EFFECT: increase of measurement accuracy, simplification of design and increase of operation convenience.

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Description

The invention relates to the field of medicine and medical equipment and can be used to measure blood pressure according to the measured parameters of the pulse wave.

A device for measuring blood pressure is known, which implements an auscultatory method of measurement, comprising a housing with controls in the form of buttons, an inflatable cuff and a display for reading information about the pressure value (EP No. 0705563 A1 according to class A61B 5/022 from 10.04 .1996).

The disadvantage of this device, as well as all devices for measuring pressure, containing an inflatable cuff, is that when using them there are difficulties without outside help and the inability to use it if necessary to conduct long-term continuous monitoring of blood pressure.

In addition, the disadvantage of this device is the relatively low measurement accuracy due to the low signal-to-noise ratio.

A device for measuring blood pressure by pulse wave parameters, comprising a housing, a mounting device located on the wrist in the form of a strap, a sensor for sensing blood pressure, means for converting pressure into an electrical signal, made in the form of a flexible diaphragm, and means for displaying information about the measurement results, and the sensor is filled with fluid (patent RU No. 2140187 according to class A61B 5/022 of 11/11/94).

The disadvantage of this device is the complexity of the design of the mechanism for installing the sensor over the radial artery, the complexity of the sensor itself for the perception of blood pressure and the complexity of the drive element to the sensor, which ultimately reduces the accuracy of measuring blood pressure.

The closest technical solution for the combination of essential features is a device for measuring blood pressure, comprising a case in the form of a watch case, an element for attaching the case to the wrist of the user, elements for turning the device on and off located on the case, an information indicator of the measured pressure, a pulse sensor located in the case waves with a sensitive element and a unit for analyzing the measured information (EP 0653182 according to class A61B 5/024 of 10/19/1994).

The disadvantage of this device is its relatively low accuracy of measurement, due to the fact that the use of a piezoelectric sensor mounted on the user's finger does not allow you to accurately orient the sensor, and, in addition, the piezoelectric sensor does not provide the required accuracy of converting the pressure force into an electrical signal.

The problem to which the claimed invention is directed, is to increase the measurement accuracy, simplify the design and increase ease of use.

The problem is solved due to the fact that in the device for measuring blood pressure, containing the case in the form of a watch case, an element for attaching the case to the wrist of the user, elements for turning the device on and off in the form of buttons on the case, an information indicator located on the front side of the case, a pulse wave sensor with an element pressing against the radial artery and with a sensitive element and a unit for analyzing the measured information, the body mounting element on the user's wrist is made in the form of a bracelet with a the ability to adjust the force of pressing it to the wrist, and the pulse wave sensor is located directly on the bracelet and is equipped with a fiber-optic converter, the sensitive element of the pulse wave sensor is made in the form of an elastic flat plate fixed at one end in the sensor case, and the other free end of the plate is fixed to the side the surface of the cylinder, freely placed in the sensor housing, and on the middle part of the cylinder there is an element pressed against the radial artery, the outer diameter of which is 0.8-1.2 of the diameter of the radial the wrist, and the sensor is equipped with a fiber-optic transducer of bending strain of the sensing element, the longitudinal axis of the cylinder coinciding with the axis of the fiber-optic transducer, and on the device’s body there are elements for indicating the position of the sensor on the wrist in the form of a two-color indicator, electrically connected to the unit analysis of the measured information.

Figure 1 presents a General view of a device for measuring blood pressure.

Figure 2 presents a cross section of a device for measuring blood pressure.

Figure 3 presents a graph of a pulse wave.

Figure 4 presents a General view of the pulse wave sensor.

Figure 5 presents a block diagram of a device for measuring blood pressure.

Figure 6 presents the front panel of the body of the device for measuring blood pressure.

A device for measuring blood pressure comprises a case 1 made in the form of a watch case, an element for attaching the case to the wrist, made in the form of a bracelet 2 with the possibility of adjusting the force of its pressure against the wrist by adjusting the number of parts of the bracelet (not shown conventionally in the drawings).

Directly on the bracelet is a pulse wave sensor 3 containing a sensing element in the form of an elastic flat plate 4, fixed at one end in the housing by a screw 5, and the other free end 6 of the plate 4 is fixed on the side surface of the cylinder 7, freely placed in the housing of the sensor 8. On the middle part of the cylinder is fixed an element of pressing (pelot) 9 to the radial artery. The sensor is equipped with a fiber-optic bending strain transducer of the sensing element 10, the longitudinal axis of the cylinder 7 coinciding with the axis of the fiber-optic transducer, while the end surface from the location of the fiber-optic transducer is polished.

The outer diameter of the pelota is selected from a ratio of 0.8-1.2 diameters of the radial artery in the wrist.

The unit for analyzing the measured information contains a signal amplifier 11, a filter for extracting the variable components of the signal 12, an analog-to-digital converter 13, an information indicator 14, a voice synthesizer 15, and a two-color sensor placement indicator.

The device operates as follows.

Before measuring blood pressure, the user puts a bracelet on his wrist and adjusts the placement of the pelota on the wrist so that the center of the pelota is placed above the radial artery in the wrist. Position monitoring is carried out when the device is turned on, in which indicator 16 starts to glow. The indicator glowing with a pale red color means that the center of the pelot is not located above the radial artery, and when the indicator glows with a brighter red color, it means that the pelot is located above the radial artery. It should be noted that a two-color indicator of any color can be used. After determining the location of the pelot, the operation of clamping the pellet to the wrist is carried out by fitting the bracelet.

With a pellet diameter selected from the above ratio, a substantially “point contact” with the radial artery is provided.

The cantilever sensing element 4 under the action of a pulse wave is bent and there is a shift in the vertical plane of cylinder 7. This shift is detected by the fiber-optic converter and the shape of the pulse wave is determined by the electric signal, which when the device is turned on (using button 17) is displayed on the information indicator 14.

The pulse waveform is a function of the applied pressure and is used for further processing.

The processed signals from the analog form are converted into a digital and digital signal characterizing the amplitude of the perceived pulse waves of blood pressure, it is calculated in the information measurement analysis unit to obtain the values of systolic and dystolic blood pressure, the difference between these values and the stress index. The indicated values are displayed on indicator 14 when you press the "HELL" button on the front panel. Information can be transmitted in the form of sound through the voice synthesizer 15.

The use of a sensor with a sensitive element in the form of a cantilever fixed plate, the bend of which is recorded by a fiber-optic converter, increases the measurement accuracy. The implementation of the housing mounting element in the form of a bracelet on which the sensor is located increases the accuracy of positioning the sensor above the radial artery, and the presence of elements indicating the position of the sensor allows you to quickly carry out the desired orientation of the sensor relative to the radial artery.

The device is small-sized, convenient for conducting continuous, non-invasive control of blood pressure.

Claims (1)

A device for measuring blood pressure, comprising a case in the form of a watch case, an element for attaching the case to the wrist of the user, elements for turning the device on and off in the form of buttons on the case, an information indicator located on the front side of the case, a pulse wave sensor with an element pressing against the radial artery , in the housing of which a sensing element is placed, and a unit for analyzing the measured information, located in the device’s case, characterized in that the housing fastening element on the user's wrist I am made in the form of a bracelet with the ability to adjust the force of pressing it against the wrist, the pulse wave sensor is placed directly on the bracelet and is equipped with a fiber-optic bending strain transducer of the sensing element, the sensing element of the pulse wave sensor is made in the form of an elastic flat plate, one end of which is fixed in the case pulse wave sensor, and the other free end of the plate is fixed on the side surface of the cylinder, freely placed in the body of the pulse wave sensor, while on the element of the cylinder is fixed to the radial artery, the diameter of which is 0.8-1.2 the diameter of the radial artery in the wrist, the longitudinal axis of the cylinder coincides with the axis of the fiber-optic transducer, and the sensor’s position on the wrist in the form of a two-color indicator, electrically connected to the unit for analysis of the measured information.

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