SU1243693A1 - Apparatus for recording blood pressure - Google Patents

Description

one

The invention relates to medical technology and can be used in instruments for monitoring the state of the cardiovascular system of a human or animal, in particular, in instruments for recording or recording blood pressure curves in a plurality of body parts.

Simultaneous recording of pressure in the aggregate of body parts makes it possible to objectively trace the dynamics of the distribution of blood flow, assess the state of the heart, blood vessels and: the body's response to various effects.

A device for recording blood pressure is known, comprising a pneumatically-connected source of constant pneumatic pressure (a compressor), a constant-pressure pneumatic transducer in a linearly expanding and occlusive cuff, and a blood pressure sensor.

A disadvantage of the known device is the low accuracy of reproduction of blood pressure curves for a given law of change in the pressure of the pressurization of the cuff.

The closest to the technical essence of the invention is a device for recording blood pressure, containing pneumatically connected in series: a source of pneumatic pressure (compressor), a pneumatic pressure transducer

In the linearly expanding and pneumatic distributor with pneumatic outlets, to each of which, through the air throttle, the corresponding occlusive cuffs are detachably connected, as well as the boost pressure sensor connected to the outlet of the pneumatic converter, and the control unit, the electrical input and output of which are connected respectively to the outlet boost pressure sensor and electrical inputs of a pneumatic pressure source, a pneumatic converter and a pneumatic distributor, each replaceable occlusive cuff It is made of a flexible non-expandable rim (of tarpaulin) with a elastic pocket and means of securing the cuff on the patient's body, an elastic sensitive pilot and a pneumatic pilot (of thin rubber) j whose internal cavity is connected through an air choke with a corresponding thin pneumatic exit pneumatic expansion

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, and a sensor of recorded pressure of blood connected to the internal cavity of the pneumatic pilot, placed in a pocket of the cuff sheath.

However, the low accuracy of reproduction of blood pressure curves in the totality of the examined parts of the patient's body for a given law of pressure variation of the quadruvic cuffs, as well as low reliability of the device, which is due to the presence of air) to chokes with small diameters i-sx channels (sp :: ha Generals for the release of cuffs from the source of pressurization and from each other by the pressure pulsations of the blood to the pneumoconvivital-hl) 5 voiss-drgg air ducts located in the outlet ducts to the random and significant deviations of actual laws from tim pressurization cuff different from the law of varying the supplied pressure when changing the cuff and at a partial blockage dross; Leu, and the total yield from the individual recording channels tup npFi completely clogged with Responsible vuyuschih chokes.

The invention is a reduction in measurement error due to the stabilization of boost pressure.

The delivered chain is achieved by teMd that in the device for recording blood pressure containing pneumatically connected in series a source of pneumatic pressure and a pneumatic distributor with N pneumatic exhausts according to the number of simultaneously examined parts of the patient's body, as well as N-occlusion 1-1 O cuffs, connected: to the appropriate pneumatic -1 outlets of the pneumatic divider, with each occlusive cuff sheath with an elastic pocket and means for fixing the cuffs on the patient's body pneumatic singing t .. pog- eschenny into the pocket of the cuff-5olochki "elastic pelota sensor and pressure sensor inserted in each sleeve between the flexible partition and sensitive pneumatically TH4e. pilots, pneumatic pilos are directly connected to the corresponding outlets -, pneumatic distributor, and sensitive pilots - from - date - t.-kd.mk pressure „

Fig, 1 shows the block diagram of the proposed device; Fig 2 - section of the cuff ,.

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A device for recording blood pressure contains a source of pneumatic pressure 1 associated with pneumatic distributor 2 with N pneumatic outlets, where N is the number of simultaneously examined parts of the patient's body. For each outlet of the pneumocolor 2 piles, a corresponding occlusive cuff 3,

Each occlusal cuff 3 consists (FIG. 2) of the sheath 4, for example, a tarpaulin (about 0.2-0.5 mm thick) with a pocket 5 of elastic material and means for fastening the cuff 3 on the patient's body (FIG. 2 are not shown; these means can be made, for example, either in the form of a tapered end strip of the shell 4, laid down after winding the cuff shell between its turns, or in the form of a pouring layer on the surface of the shell 4, cuff 3, or in the form of fasteners) pneumatic pelota 6, made of elastic material, for example Sesins with a thickness of about 0.2-0.3 mm, placed in the pocket 5 of the shell 4 of the cuff 3, sealed sensitive pilot 7, filled with gas (air) or hydraulic fluid and made of elastic material, for example, similar to the material of pneumatic pilot 6, and sensor 8 blood pressure (pressure transducer, differentiating pressure transducer), while the sensitive pilot 7 is placed in the pocket 5 of the window 4 of the cuff 3 and separated from the inner surface of the pneumatic pilot 6 by a flexible partition 9, which baffles the required pneumatic resistance and made, for example, of a tarpaulin with a thickness of about 0.5-1.5 mm, the edges of which, except for one facing the entrance to the quara, are mounted on the sheath 4 of the cuff 3 (for example, glued), the pneumatic pilot 6 is connected directly to the corresponding output of the splitter 2, and the sensor 8 of the blood is connected to the internal cavity of the sensitive pilot 7.

A device for recording blood pressure works as follows.

On the studied parts of the body of a human or experimental animal (head, arms, legs, tail of an animal

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etc.) the occlusal cuffs 3 are secured. The source 1 of the variable pneumatic pressure forces air into the cuffs 3 through the pneumatic distributor 2. In this case, the inflation rate of the cuff is 3-6 mm Hg. per second. The linear-growing pressure is distributed by pneumatic distributor 2 through all pneumatic capes 6 used cuffs 3. Through flexible partitions 9, it is transmitted to sensitive plots 7 and affects the patient's body parts being examined. The pneumatic system 6 - the flexible partition 9 - the sensitive pilot 7 when the pressure P from the pneumatic pilot 6 is equivalent to the electrical integrating

20 RC chains with the same time constant T; (, 2, ... N). When such linear pressure chain P (t) kt is fed to the input, the output signal (pressure) has the form P (t)

25 kt-k with; l-exp (-t /, -). With increasing time t, the dependence of the actual pressurization pressure R. (t) approaches a linear but delayed relative input dependence Pj, (t)

30 by the value of a constant time ... This means that the value can be increased to such values at which the specified delay and the initial non-linear portion of the P- (t) dependence occupies the permissible part of the total time for recording the blood pressure curve Tr. Then the instinctive pressure of the boost P - (t)

five

can be found by subtracting from the readings of the pressure sensor, fixing the values of P (t), the constant correction, or k c. For example, at P 300 mm Hg. and mm Hg in- 1 / s Tpr 300/5 60 s. Then the quantity; 5 sec may be considered acceptable if it is acceptable that the non-linear portion of the P- (t) curve is less than 10% of Tp. In this case, the correction is k1; 25 mmHg

For the use of this amendment, the constant time T is ensured; all cuffs. Since R; Cj, where R; - pneumatic resistance of the flexible partition 9, determined by the coefficient of internal friction of the partition material, C; - the pneumatic capacity of the sensitive pilot 7, then an equally constant time is achieved by selecting the material of flexible partitions of known materials (for example, tarpaulin) with the appropriate dimensions and specific coefficients of internal friction for each cuff, as a result of which the product of the pneumatic resistance of the flexible partition and pneumatic The capacity of the sensitive pilot for all U cups is equal to the required value.

Under the influence of blood pulsations, pressure pulsations from the examined body parts, for example, the arteries (Fig. 2), produce pressure pulsations in the sensitive pilots 7, since the elastic material of the pockets 5 and the shells of the sensitive pilots 7 cause negligible pneumatic pulsation resistance, and flexible bulkheads 9, which have much greater pneumatic resistances, since they are made of a material with significant internal friction during its deformations, dissolve (strongly

pneumatic coupling due to pulsations) sensitive pilots 7 from a source of pressurization with low impedance (from pneumatic pilots 6) are weakened. The blood pressure pulsations in each sensitive Pelote 7 are converted by the corresponding sensors 8 of the recorded pressure into electrical signals. These signals are output to the device outputs. The magnitude of this pressure (unregulated or regulated during the registration of blood pressure curves) is determined by the required conditions for the registration of these curves.

A comparative analysis showed that the accuracy of reproduction of blood pressure curves in the aggregate of the N patient parts of the patient's body examined, (), when using this invention, increases by no less than 5-10 times, and reproduction becomes significantly more reliable compared to known devices.

Editor M. Kelemesh Order 3732/3

Compiled by A. Balabanov Tehred L. Oleinik

Circulation 660 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.

Production and printing company, Uzhgorod, st. Project, 4

Fi8.1

Proofreader A. T sko Subscription

Claims (1)

A BLOOD PRESSURE REGISTRATION DEVICE containing a pneumatically connected pneumatic pressure source and a pneumatic splitter with N pneumatic outlets according to the number of simultaneously examined parts of the patient’s body, as well as N occlusal cuffs connected to the corresponding pneumatic splitter outlets, each occlusal cuff containing a shell with an elastic pocket and means for securing the cuff on the patient’s body, pneumatic pelot placed in the pocket of the cuff shell, electric a sensitive sensitive pellet and a blood pressure sensor, characterized in that, in order to reduce the measurement error due to stabilization of boost, a flexible partition between sensitive and pneumatic pellets is inserted into each cuff, pneumatic pellets are directly connected to the corresponding outputs of the air splitter, and sensitive pelots are connected to pressure sensors.