RU87341U1 - HUMAN HAND MODEL FOR VERIFICATION OF ARTERIAL PRESSURE METERS AND FREQUENCY OF HEART REDUCTIONS - Google Patents

Abstract

1. Model of a human hand for checking blood pressure and heart rate meters, containing a cylinder for attaching a compression cuff of the first type of sphygmomanometer, in which an elastic tube is placed that simulates the brachial artery of a human hand, characterized in that it contains a second cylinder for attaching a compression cuff of the second such as a sphygmomanometer, in which an elastic tube with a locking-regulating element is placed that simulates an artery on the wrist of a person’s hand, while Ndrov made with the possibility of hydraulic union. ! 2. The model of the human hand according to claim 1, characterized in that it contains a locking and regulating element connecting, hydraulically combining the cylinders. ! 3. The model of the human hand according to claim 1, characterized in that in the elastic tube simulating the brachial artery of the human hand, a locking-regulating element of the bypass channel is installed.

Description

The utility model relates to instrumentation and is used as part of a calibration installation for metrological certification of blood pressure and heart rate meters.

A known installation for checking automated measuring instruments for blood pressure and heart rate (Patent RU No. 2210974, АВВ 5/02, publ. 27.08.03, Bull. No. 24) - [1]. The apparatus comprises a cylinder simulating a patient’s hand, a pressure pulsation generator simulating a pulse frequency and comprising a crystal frequency generator and an electromagnet, a working pressure and frequency standard. The cylinder imitating the patient’s hand, on which the compression cuff of the calibrated measuring instrument is put on, is a model of the human hand. The core of the electromagnet is made with emphasis in the elastic bottom of the cylinder to transmit pressure pulsations through the oil to the cuff with a frequency specified by the generator.

In the design of the installation described above, pressure pulsations are transmitted to the compression cuff through the entire cylinder imitating the arm, whereas in the real blood circulation process, pressure pulsations are transmitted only through the artery. It is also necessary to disconnect the compression cuff from the calibrated measuring device to connect the compression cuff and the calibrated measuring device through the connection element to the installation's pneumatic system, while for some types of measuring instruments the cuff is not structurally disconnected, and therefore it is impossible to verify such a device on this installation.

A known installation for the complete calibration of measuring blood pressure and heart rate according to patent RU No. 2223031, AB 5/02, publ. 02/10/04, Bull. No. 4 - [2]. The installation comprises a cylinder of elastic material that imitates the patient’s hand, a simulator of the patient’s artery in the form of an elastic tube, a blood pressure pulsation adjuster, an additional cylinder of elastic material, a compression cuff of the instrument under test, a working pressure standard and a control unit. The pressure pulsation regulator contains a quartz frequency generator and an electromagnet, the rod of which is in close contact with the bottom of the additional cylinder. The tube and cylinder are filled with liquid medium. The tube with its free end is connected to a chamber for damping pulsations (pressure stabilization unit) filled with a liquid medium. A cylinder of elastic material that imitates a patient’s hand, as well as a patient’s artery simulator in the form of an elastic tube rigidly connected to a cylinder, are a model of a person’s hand.

An electromagnet oscillates a rod, which, pushing the elastic bottom of the cylinder, transfers pulsations through the oil in the elastic tube of the main cylinder to the compression cuff, thereby simulating the pulse rate. The cylinder is connected to a working pressure standard, which is a pressure differential pressure transducer (differential pressure gauge) with a tolerance range of ± 0.075% in the measurement range from 4 to 40 kPa (30-300 mmHg). The positive chamber of the differential pressure gauge is connected by a tube of the pneumatic system to the cylinder, and the negative chamber is connected to the atmosphere.

For comparative analysis with the claimed utility model, a human hand model is adopted, which is part of a device for checking automated sphygmomanometers according to patent RU No. 2301020, АВВ 5/02 and G01L 27/00, publ. 06/20/07 Bull. No. 17 - [3]. The device includes: a cylinder simulating a human hand, a flexible elastic tube simulating an artery of a human hand, a control unit, a source of pressure pulsations, which contains a pump and a variable flow generator, one input of which is hydraulically connected to the pump, and the second input is electrically connected to the unit control, pressure regulator hydraulically connected to the pump, working pressure standard. A flexible elastic tube located in the cavity of the cylinder, as well as the cylinder itself, is a model of the human hand and makes up the measuring module. At the output of the variable flow generator, there are two rigid tubes forming the measuring and bypass channels. The measuring channel is structurally the above-described measuring module (flexible elastic tube and cylinder). The measuring module transmits a signal to the control unit through a working pressure standard and is hydraulically connected to the pressure regulator input. The outputs of the control unit are electrically connected to the pump, the pressure regulator, the variable flow generator, and the inputs of the control unit are the outputs of the working pressure standard.

Measurement of systolic, diastolic pressure and heart rate is carried out by a sphygmomanometer on a cylinder imitating a human hand.

However, this device can only be used for checking sphygmomanometers with a cuff on the shoulder.

The technical result, which is achieved by the claimed utility model, is to expand the range of verified automated sphygmomanometers with cuffs on both the shoulder and wrist on the same calibration device.

The technical result is achieved in that in a human hand model for checking blood pressure and heart rate meters, containing a cylinder for attaching a compression cuff of the first type of sphygmomanometer, in which an elastic tube simulating the brachial artery of a human hand is placed, it is new that it contains a second a cylinder for attaching a compression cuff of the second type of sphygmomanometer, in which an elastic tube with a locking-regulating element that imitates an artery at the wrist of the human hand, while the cavity of the cylinders are made with the possibility of hydraulic union.

The model of a human hand for checking blood pressure and heart rate meters contains a locking and regulating element connecting, hydraulically combining the cylinders.

In the elastic tube imitating the brachial artery of a person’s arm, a locking-regulating element of the bypass channel is installed.

This device uses a serial connection of two measuring modules (sections of calibration of sphygmomanometers on the shoulder and on the wrist), a locking-regulating element of the bypass channel, as well as a locking-regulating element connecting. All this makes it possible to verify two types of sphygmomanometers on the same device both simultaneously and separately.

The essence of the utility model is illustrated in figure 1 and figure 2, where:

Figure 1 - Model of a person’s hand for checking blood pressure and heart rate meters;

Figure 2 - Functioning of a control and measuring system based on a model of a human hand for checking blood pressure and heart rate meters.

Here:

1 - the first cylinder;

2 - second cylinder;

3 - an elastic tube simulating the brachial artery of a person’s hand;

4 - an elastic tube simulating the artery of the human wrist;

5 - locking regulating element of the bypass channel;

6 - locking and regulating element of the second measuring module;

7 - locking regulating element connecting;

8 - the partition is impermeable;

9 - compression cuff of the sphygmomanometer with a cuff on the shoulder;

10 - sphygmomanometer with a cuff on the shoulder;

11 - compression cuff of the sphygmomanometer with a cuff on the wrist;

12 - sphygmomanometer with a cuff on the wrist;

13 - the first working standard of pressure and frequency;

14 - second working standard of pressure and frequency;

15 - pump;

16 - variable flow generator;

17 - control unit.

The arm model consists of two cylinders 1 and 2, in which elastic tubes 3 and 4 are placed, which simulate the brachial artery and artery on the wrist of a person, respectively. The regulation of the flow rate of the working fluid in the tube 4 is carried out by the locking and regulating element 6. The regulation of the flow of the working fluid in the tube 3 is carried out by the locking and regulating element 5. The cylinders 1 and 2 are separated by an impermeable partition 8, in which the locking-regulating element connecting 7, which performs the function hydraulic union of cylinders 1 and 2, equalizing the corresponding pressures in them for more accurate transmission of pulsations of the working fluid to the compression cuffs of calibrated measuring instruments . The compression cuff 9 of the verified sphygmomanometer 10 is put on cylinder 1, the compression cuff 11 of the verified sphygmomanometer 12 is put on the second cylinder 2. Working pressure and frequency standards 13 and 14, which are connected to cylinders 1 and 2, respectively, are used to control the pressure and pulse rate.

The device operates as follows.

1. When checking sphygmomanometers with a cuff on the shoulder.

Using the control unit 17 sets the desired pressure and frequency. The generated signal is fed to the input of the pump 15 and the variable flow generator 16, with the help of which the working fluid is pumped into the elastic tube 3 of the first measuring module with the given pressure and pulsation frequency. The locking and regulating element 5 is open, the locking and regulating element 6 is closed.

In the process of fluid movement through the hydraulic system of the first measuring module, the measured pressure and frequency are perceived by both the calibrated sphygmomanometer 10 and the working pressure and frequency standard 13 whose measurement results are compared.

The first measuring module through a working pressure and frequency standard 13 transmits a signal to a control unit 17, which generates the required control signals to adjust the hydraulic system parameters (pressure and pulsation frequency).

2. When checking sphygmomanometers with a cuff on the wrist.

In the elastic tube 4 of the second measuring module using a pump 15 and a variable flow generator 16 is injected with a working fluid with a given pressure and pulsation frequency. The locking and regulating element 6 is open, the locking and regulating element 5 is closed.

In the process of fluid movement through the hydraulic system of the second measuring module, the measured pressure and frequency perceives both the calibrated sphygmomanometer 12 and the working pressure and frequency standard 14.

The second measuring module through the working pressure standard 14 transmits a signal to the control unit 17, which generates the required control signals to adjust the hydraulic system parameters (pressure and pulsation frequency).

3. At the same time checking sphygmomanometers with cuffs on the shoulder and on the wrist.

Using the control unit 17 sets the desired pressure and frequency. The generated signal is fed to the input of the pump 15 and the variable flow generator 16, with the help of which the working fluid is pumped into the elastic tube of the first measuring module with the given pressure and pulsation frequency. The locking and regulating elements 5 and 6 are open. The working fluid flows both through a tube 3 simulating the brachial artery of a person’s hand, and through a tube 4 simulating an artery on the wrist of a person’s hand.

The locking and regulating element connecting 7 provides a hydraulic combination of cylinders 1 and 2 for more accurate transmission of pulsations of the working fluid to the compression cuffs of the calibrated measuring instruments when checking sphygmomanometers with both a cuff on the shoulder and on the wrist, equalizing the pressure in them.

Thus, a device is proposed that can be used both for testing automated sphygmomanometers with a cuff on the shoulder, and for checking automated sphygmomanometers with a cuff on the wrist, both together and separately. At the same time, the solution to this device is simple in execution, simple and reliable in operation.

Claims (3)

1. Model of a human hand for checking blood pressure and heart rate meters, containing a cylinder for attaching a compression cuff of the first type of sphygmomanometer, in which an elastic tube is placed that simulates the brachial artery of a human hand, characterized in that it contains a second cylinder for attaching a compression cuff of the second such as a sphygmomanometer, in which an elastic tube with a locking-regulating element is placed that simulates an artery on the wrist of a person’s hand, while Ndrov made with the possibility of hydraulic union. 2. The model of the human hand according to claim 1, characterized in that it contains a locking and regulating element connecting, hydraulically combining the cylinders. 3. The model of the human hand according to claim 1, characterized in that in the elastic tube simulating the brachial artery of the human hand, a locking-regulating element of the bypass channel is installed.