JP7308077B2 - Automatic blood pressure measuring device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic blood pressure measuring device having a compression band wrapped around a part of a living body such as an arm or ankle.

For the compression band used in the automatic blood pressure measuring device, the type of compression band, that is, the cuff size, which has a size (perimeter) suitable for compressing the part of the body, such as the difference in the circumference of the arm, is selected. is important to maintain blood pressure measurement accuracy.

On the other hand, in Patent Document 1, determination means for determining the size of the cuff is provided, and air is supplied to the cuff according to the cuff pressure measured by the cuff pressure measurement means and the compression band size determined by the determination means. An electronic sphygmomanometer has been proposed with blood pressure measuring means for controlling the supply of blood pressure.

JP-A-02-307427

By the way, in Patent Document 1, the electronic blood pressure monitor is provided with a designation switch for designating the compression band size, and the control unit of the electronic blood pressure monitor controls the cuff connected to the electronic blood pressure monitor based on the operation of the designation switch. It is adapted to determine the compression band size. Further, in Patent Document 1, a cuff connector for connecting the cuff to an electronic sphygmomanometer is provided with a pin provided with identification code information of the cuff, and the potential of the pin is coded to High/Low. It has also been proposed to input the cuff size to the control.

However, when the designated switch is used, there is a drawback that the possibility of forgetting to operate or erroneously operating the designated switch due to manual operation cannot be eliminated. On the other hand, when the cuff connector is provided with a pin with identification code information, the possibility of forgetting to operate or erroneous operation can be eliminated. The socket to which the cuff connector is connected becomes complicated by adding the connector structure that electrically connects with the pin when the pin is inserted into the connection structure of the air passage. There was a problem that it became big.

SUMMARY OF THE INVENTION The present invention has been made against the background of the circumstances described above, and an object of the present invention is to identify the type of compression band without using a pin to which the identification code information of the compression band is attached. To provide an automatic blood pressure measuring device capable of

The gist of the first invention is (1) a socket into which a connector connected via a flexible tube to a compression band wrapped around a part of the living body is detachably inserted; A pressure sensor for detecting the pressure between the fluid supply source and the amplitude of the pulse waves sequentially generated in synchronization with the pulse of the living body, which is detected in the process of gently changing the compression pressure of the compression band. An automatic blood pressure measuring device for determining a blood pressure value of a living body based on a change in value, wherein (2) the blood pressure measurement device is smaller than the cross-sectional area of the plug provided in the connector corresponding to the type of the compression cuff. A throttle element having a flow cross-sectional area and a buffer element having a flow cross-sectional area larger than the flow cross-sectional area of the plug are provided to affect the compressible fluid passing through the connector for each type of compression band. (3) compression pressure control means for supplying the compressive fluid to the compression band and stopping the supply of the compressive fluid after a predetermined time; and (4) the compression pressure control means Critical point reaching supply when the supply pressure of the compressible fluid reaches a critical point where the flow rate of the compressible fluid supplied by the compression pressure control means and the flow rate of the compressible fluid flowing into the compression band are equal. and a compression band size determining means for determining the type of the compression band based on the pressure and the critical point arrival time from the start of supply of the compressible fluid to the critical point.

According to the automatic blood pressure measuring device of the first invention, the restrictor element provided in the connector corresponding to the type of the compression band and having a cross-sectional flow area smaller than that of the plug and the plug. a fluid circuit element having a buffer element having a flow cross-sectional area larger than the flow cross-sectional area, and having an effect on the compressible fluid passing through the connector for each type of the compression cuff; compression pressure control means for supplying the compressible fluid and stopping the supply of the compressible fluid after a predetermined time; and A critical point reaching supply pressure when the fluid supply flow rate and the inflow flow rate of the compressible fluid into the compression zone reach a critical point, and from the start of the supply of the compressible fluid to the critical point a compression wrap size determining means for determining the type of the compression wrap based on the critical point arrival time to. As a result, the type of compression band can be identified without using a pin to which the identification code information of the compression band is attached.

Preferably, said connector comprises a first tubular plug that is inserted into said socket , a second tubular plug that is inserted into the end of a flexible tube connected to said compression garment, said first tubular plug and said first tubular plug. A connector body is integrally provided with a fluid circuit element that connects the two tubular plugs and houses a fluid circuit element that exerts different effects on the compressible fluid passing through the connector for each type of the compression bandage. As a result, the connector does not require a complicated structure for providing pins with identification code information, so that the connector can be made compact and reliable for determining the type of compression bandage.

In addition, preferably, the compression band size determination means stores a predetermined correspondence relationship between the critical point reaching supply pressure and the critical point reaching time, and the type of the compression band. From the critical point reaching supply pressure and the critical point reaching time thus obtained, the compression band size of the compression band is determined based on the correspondence relationship. As a result, the type of compression bandage can be identified without using the identification code information, so that the reliability can be improved as compared with the case where the connector is provided with a pin to which the identification code information is assigned.

Also, preferably, the supply pressure of the compressible fluid is a value detected by the pressure sensor. This allows the type of compression cuff to be determined without adding a new pressure sensor to the automatic blood pressure measurement device.

Preferably, based on a change in the magnitude of a pulse wave signal obtained from pressure oscillation of the compression band that occurs during a gradual pressure drop period in which the compression pressure applied to the part of the living body by the compression band is gradually reduced. Blood pressure value determination means for determining the blood pressure value of the living body is provided, and the compression pressure control means controls the pressure band according to the type of the compression band determined by the compression band size determination means during the slow pressure drop period. to control the discharge of said compressible fluid from. As a result, the discharge amount of the compressible fluid during the slow depressurization period is controlled according to the type of the compression band. is controlled to a speed suitable for

Also, preferably, the compression pressure control means, prior to the slow pressure drop period, uses the compression band to compress a part of the living body until bleeding stops, and the compression band size is determined by the compression band size determination device. The supply amount of the compressible fluid to the compression band is controlled according to the type of the compression band. As a result, the supply amount of the compressible fluid during the compression period is controlled according to the type of the compression cuff. Therefore, even if the type of compression cuff is different, the rate of increase in pressure during the compression period is suitable for blood pressure measurement. controlled by

1 is a block diagram illustrating the configuration of an automatic blood pressure measuring device that is an embodiment of the present invention; FIG. FIG. 2 is a diagram showing the external shape of a connector used in the embodiment of FIG. 1; FIG. 3 is a cross-sectional view for explaining the shape of a channel formed in the connector of FIG. 2; 3 is a cross-sectional view for explaining the shape of a channel formed in another example of the connector of FIG. 2; FIG. FIG. 8 is a cross-sectional view for explaining the shape of a channel formed in a connector of still another example of the connector of FIG. 2; FIG. 8 is a cross-sectional view for explaining the shape of a channel formed in a connector of still another example of the connector of FIG. 2; FIG. 8 is a cross-sectional view for explaining the shape of a channel formed in a connector of still another example of the connector of FIG. 2; FIG. 8 is a cross-sectional view for explaining the shape of a channel formed in a connector of still another example of the connector of FIG. 2; FIG. 4 is a schematic diagram illustrating the relationship between supply pressure and time after the start of supply of supply pressure; FIG. 10 is a diagram for explaining the change in supply pressure over time after the start of supply of supply pressure when pressure is supplied to the compression band through two types of connectors; FIG. 4 is a diagram showing pre-stored relationships between the type of compression band, the supply pressure when reaching a critical point, and the time from the start of pressure supply to reaching the critical point. FIG. 2 is a flow chart explaining the main part of the control operation of the automatic blood pressure measuring device of FIG. 1; FIG. FIG. 4 is a cross-sectional view for explaining the shape of a flow path formed in a connector of a comparative example, corresponding to FIG. 3;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram illustrating an automatic blood pressure measuring device 10 that is one embodiment of the present invention. The automatic blood pressure measuring device 10 includes a compression band 12 and a blood pressure measuring device main body 14 . In this embodiment, the compression band 12 is a cuff, for example, a band-shaped cloth bag containing an inflatable synthetic rubber inflatable bag 12a. It is constructed so that it can be wrapped around a part of the living body, such as the upper arm 16, using fasteners (not shown) provided on the outer sides of the intermediate portions. The compression band 12 is integrally provided with a flexible tube 18, and a connector 20 provided at the distal end of the flexible tube 18 is detachably inserted into a socket 22 provided in the blood pressure measuring device main body 14. , a pressure sensor 24 in the blood pressure measuring device main body 14, an exhaust valve 26, and an air pump 28 functioning as a compressible fluid supply source.

2 shows an external shape of an example of the connector 20, and FIG. 3 shows a cross-sectional shape thereof. The connector 20 of FIG. 2 includes a first tubular plug 20a detachably inserted into a socket 22, a second tubular plug 20b inserted into the distal end of a flexible tube 18 integrally connected to the compression band 12, The first tubular plug 20a and the second tubular plug 20b are connected so that their central axes are perpendicular to each other, and the effect of flow resistance, delay, etc., which differs depending on the type of compression band 12, on air, which is a compressible fluid, is reduced. It is integrally provided with a connector body 20c that accommodates the fluid circuit element to be supplied. The fluid circuit element may be, for example, a diaphragm element having a flow cross-sectional area smaller than that of the first tubular plug 20a, or a buffer element having a flow cross-sectional area larger than that of the first tubular plug 20a. and so on. In the connector main body 20c of FIG. 3, fluid circuit elements that affect the flow of the compressible fluid differently depending on the type of the compression band 12 are provided, for example, the conduit in the first tubular plug 20a and the first throttle element. A first buffer element B1 communicating via R1 and communicating with the conduit within the second tubular plug 20b, and a first buffer element B1 communicating with the conduit within the second tubular plug 20b via the first buffer element B1 and communicating with the conduit within the second tubular plug 20b. A second buffer element B2 is provided that communicates with the element B1 via a second aperture element R2.

FIG. 4 shows a cross-sectional shape of another example of the connector 20. As shown in FIG. The connector 20 of FIG. 4 includes a first tubular plug 20a detachably inserted into a socket 22, a second tubular plug 20b inserted into the distal end of a flexible tube 18 integrally connected to the compression band 12, A connector body that connects the first tubular plug 20a and the second tubular plug 20b so that their central axes are perpendicular to each other, and accommodates a fluid circuit element that exerts different effects on the compressible fluid for each type of compression band 12. 20c are integrally provided. In the connector body 20c of FIG. 4, there is a pipe line in the first tubular plug 20a and the first diaphragm element R1 through the connector 20, and a pipe line in the second tubular plug 20b and the second diaphragm element R2. A first buffer element B1 is provided that communicates with the .

FIG. 5 shows a cross-sectional shape of another example of the connector 20. As shown in FIG. The connector 20 of FIG. 5 includes a first tubular plug 20a detachably inserted into a socket 22, a second tubular plug 20b inserted into the distal end of a flexible tube 18 integrally connected to the compression band 12, A connector body that connects the first tubular plug 20a and the second tubular plug 20b so that their central axes are perpendicular to each other, and accommodates a fluid circuit element that exerts different effects on the compressible fluid for each type of compression band 12. 20c are integrally provided. In the connector body 20c of FIG. 5, there are provided a first buffer element B1 communicating with the conduit in the first tubular plug 20a and the conduit in the second tubular plug 20b, and a second tubular plug via the first buffer element B1. A second buffer element B2 is provided that communicates with the conduit in the plug 20b and communicates with the first buffer element B1 via the second diaphragm element R2.

FIG. 6 shows a cross-sectional shape of another example of the connector 20. As shown in FIG. The connector 20 of FIG. 6 includes a first tubular plug 20a detachably inserted into a socket 22, a second tubular plug 20b inserted into the distal end of a flexible tube 18 integrally connected to the compression band 12, The first tubular plug 20a and the second tubular plug 20b are connected so that their central axes are perpendicular to each other, and a fluid circuit element that exerts a different influence on the air flow, which is a compressible fluid, for each type of compression band 12 is provided. A housing connector body 20c is integrally provided. In the connector main body 20c of FIG. 6, a first buffer element B1 is provided which communicates with the conduit inside the first tubular plug 20a and with the conduit inside the second tubular plug 20b via the second throttle element R2. It is

FIG. 7 shows a cross-sectional shape of another example of the connector 20. As shown in FIG. The connector 20 of FIG. 7 connects the first tubular plug 20a and the second tubular plug 20b so that their central axes are perpendicular to each other, and is different for each type of the compression band 12 with respect to airflow, which is a compressible fluid. A connector body 20c containing the fluid circuit elements to be affected is integrally provided. In FIG. 7, in the connector main body 20c, a first throttle element R1 is provided in series between the conduit in the first tubular plug 20a and the conduit in the second tubular plug 20b.

FIG. 8 shows a cross-sectional shape of another example of the connector 20. As shown in FIG. The connector 20 shown in FIG. 8 connects the first tubular plug 20a and the second tubular plug 20b so that their central axes are aligned, and each type of the compression band 12 is compressed against the airflow, which is a compressible fluid. Integral with the first tubular plug 20a and the second tubular plug 20b is a connector body 20c containing hydraulic circuit elements having different effects. In FIG. 8, in the connector main body 20c, a first throttle element R1 is provided in series between the conduit in the first tubular plug 20a and the conduit in the second tubular plug 20b.

FIG. 13 shows a cross-sectional shape of a connector 120 that is a comparative example of the connector 20. As shown in FIG. In the connector 120 of FIG. 13, a connector body 120c that connects the first tubular plug 120a and the second tubular plug 120b so that their central axes are aligned is integrated with the first tubular plug 120a and the second tubular plug 120b. prepared for. In FIG. 13, in the connector main body 120c, the conduit in the first tubular plug 120a and the conduit in the second tubular plug 120b are directly connected, and both the throttle element and the buffer element are provided. Not done.

Returning to FIG. 1, exhaust valve 26 has a plurality of switchable or continuously controlled exhaust orifices for exhausting air within compression garment 12 to reduce the pressure of compression garment 12 . Then, according to a command from the electronic control unit 40, the discharge amount from the pipe between the socket 22 and the air pump 28 is controlled. The air pump 28 has, for example, a pump chamber whose volume changes when an electric motor reciprocates the central portion of the diaphragm. It is composed of a diaphragm pump that delivers power, and is turned on and off at a constant drive voltage, for example, according to a command from an electronic control unit 40 .

A pressure sensor 24 is connected between the socket 22 and the exhaust valve 26 and detects the supply pressure PS of air delivered from the air pump 28 to the compression garment 12 . As shown in FIG. 9, in the transitional period M1 immediately after the start of supply, the supply pressure PS is applied to the diaphragm elements R1 and R2 (hereinafter referred to as diaphragm element R unless otherwise distinguished) or the buffer elements B1 and B2 in the connector 20. (hereinafter referred to as a buffer element B unless otherwise specified) and increases as the elapsed time t increases. During the cuff compression period M2 after reaching the critical point PL, the supply pressure PS becomes equal to the cuff pressure PC in the compression wrap 12 with a large capacity.

In FIG. 9, during the transition period M1 from the start of the supply pressure PS detected by the pressure sensor 24 to reaching the critical point PL, for example, the throttle element R in the connector 20 moves the upstream side (input side) of the connector 20. ) is greater than the flow rate Qo on the downstream side (output side) of the connector 20 (Qi>Qo), a flow rate difference (Qi-Qo) occurs, and the input side pipe internal pressure Pi (=supply pressure PS) is greater than the output-side tube internal pressure Po (=cuff pressure PC), and the supply pressure PS increases as shown in FIG. At this time, the flow velocity Vi on the input side is smaller than the flow velocity Vo on the output side (Vi<Vo). Since the capacity of the expansion bag 12a of the compression band 12 is sufficiently large, the phenomenon of increase in the above-mentioned input-side pipe internal pressure Pi (=supply pressure PS) during the transitional period M1 occurs when the compression band 12 is connected to the flexible tube 18. It is considered to be the same as the case without

When the inflation bag 12a of the compression band 12 is filled with air, the flow rate Qi on the upstream side (input side) of the connector 20 and the flow rate Qo on the downstream side (output side) of the connector 20 become equal (Qi= Qo), the flow rate difference (Qi-Qo) is eliminated, and the flow velocity Vi on the input side and the flow velocity Vo on the output side become equal (Vi=Vo). The cuff compression period M2 after the critical point PL indicated by the critical point reaching supply pressure ΔP at the critical point reaching time Δt in FIG. 9 shows this state. Here, when the buffer element B is added in addition to the diaphragm element R in the connector 20, the capacitive component in the connector 20 increases. By decreasing the flow velocity difference (Vi-Vo) with the critical point PL, the critical point reaching time Δt increases, and the critical point reaching supply pressure ΔP when reaching the critical point PL decreases.

In such a phenomenon, the pressure change in the compression band 12 becomes as shown in the transition period M1 in FIG. A map in which the actual critical point reaching supply pressure ΔP and the critical point reaching time Δt when the critical point PL is reached are obtained and stored in advance for each size type (compression band size) of the compression band 12. The type of the compression band 12 can be determined based on which of the critical point reaching supply pressure ΔP and the critical point reaching time Δt in (relationship) applies.

Returning to FIG. 1, the pressure sensor 24 detects the pressure (cuff pressure) PC within the compression band 12 after the critical point PL, and converts the pressure signal SP representing the cuff pressure PC into a static pressure discriminator having a low-pass filter function. They are supplied to a circuit 30 and a pulse wave discriminating circuit 32 having a bandpass filter function. The static pressure discriminating circuit 30 discriminates the static pressure component, that is, the compressing pressure component of the compression band 12 from the pressure signal SP, and outputs the compressing pressure signal SC to the electronic control unit 40 via the A/D converter 34 . Pulse wave discriminating circuit 32 discriminates, for example, pulse wave components of about 1 to 30 Hz and outputs pulse wave signal SM to electronic control unit 40 via A/D converter 36 .

The electronic control unit 40 is composed of a microcomputer having a CPU, ROM, RAM, and interfaces (not shown). By executing the processing of the input signal, the air pump 28 and the exhaust valve 26 are controlled, the cuff pressure control, the compression band size determination control, and the blood pressure value determination control are executed, and the determined compression band size is determined. and the determined blood pressure value are displayed on the display 38 . That is, the electronic control unit 40 has a compression pressure control means 42, a compression band size determination means 44, and a blood pressure value determination means 46 as main parts of the control function.

When the compression-wrap size determination means 44 determines the size of the compression-wrap, the compression-pressure control means 42 first starts supplying pressure to the compression-wrap 12, and stops the air pump 28 after a predetermined supply time, for example, 200 ms. at least one cycle, preferably two cycles. 10 is provided with a connector 20 housing the first diaphragm element R1, the first buffer element B1 and the second diaphragm element R2 shown in FIG. 4, and the diaphragm element R and the buffer element B shown in FIG. The values obtained when the supply pressure PS is measured over two cycles when the connector 120 without the connector 120 is used are shown using the measurement points marked with Δ and the measurement points marked with □.

The compression band size determining means 44 determines that the amount of change or the rate of change between sampling periods of the supply pressure PS after air is supplied from the air pump 28 to the compression band 12 falls below the threshold value A1 set for detecting the sudden change. The critical point PL is determined based on the above, and the critical point reaching time Δt, which is the elapsed time from the start of the supply pressure PS when the critical point PL is reached, and the critical point reaching supply pressure ΔP at that time are determined. do.

Further, when the critical point reaching supply pressure ΔP is measured over, for example, two cycles, the compression band size determining means 44 determines the critical point reaching time Δt1 and the critical point reaching supply pressure for the first cycle critical point PL1. ΔP1 is compared with the critical point arrival time Δt2 and the critical point arrival supply pressure ΔP2 for the critical point PL2 in the second cycle, and if the difference exceeds the reproducibility criterion, measurement is started again. If the difference is not below the reproducibility criterion, either one of the critical point reaching time Δt1, the critical point reaching supply pressure ΔP1, the critical point reaching time Δt2 and the critical point reaching supply pressure ΔP2, or their average value, It is used as the critical point reaching time Δt and the critical point reaching supply pressure ΔP.

Then, the compression band size determination means 44 determines the critical point reaching time Δt, which is the elapsed time from the start of the supply pressure PS to reaching the critical point PL, and the critical point reaching supply pressure ΔP, for example, in a plurality of types shown in FIGS. Based on which critical point reaching time Δt and critical point reaching supply pressure ΔP in a map stored in advance so that the critical point reaching time Δt and critical point reaching supply pressure ΔP of the compression band 12 correspond to , determines the type of compression wrap 12 . FIG. 11 shows an example of a map.

The blood pressure value determination means 46 determines the cuff pressure PC generated during the slow pressure decrease period in which the compression pressure, that is, the cuff pressure PC is gradually decreased from the state in which the compression band 12 has stopped the bleeding with the systolic pressure or higher for the upper arm 16 of the living body. The systolic and diastolic blood pressure values of the living body are determined based on changes in the magnitude of the pulse wave signal SM obtained from the pressure oscillations.

When blood pressure is measured by the blood pressure value determination means 46, the compression pressure control means 42 controls the pressure band size determination means 44 during the compression period in which the upper arm 16 of the subject is pressed until the bleeding stops prior to the slow blood pressure decrease period. For example, the duty ratio of the drive signal to the air pump 28 is adjusted so that the increase rate of the cuff pressure PC becomes a preset target increase rate value according to the type (capacity) of the compression band 12 determined by to control the amount of air supplied to the compression band 12. In addition, when measuring blood pressure, the compression pressure control means 42 controls the amount of exhaust gas from the compression wrap 12 ( The discharge amount) is controlled, for example, by switching the exhaust orifice of the exhaust valve 26 so that the gradual pressure drop rate becomes a preset target pressure drop rate value.

FIG. 12 is a flow chart for explaining the essential part of the control operation of the electronic control unit 40. As shown in FIG. In FIG. 12, in step S1 (hereinafter, step is omitted), the air pump 28 starts operating in response to symbol operation of the automatic blood pressure measuring device 10, and pressure supply through the connector 20 is started. In S2, it is determined whether or not the time elapsed since the operation of the air pump 28, that is, the start of pressure supply, has elapsed for a certain period of time, for example, about 200 ms. The process is put on standby until the determination in S2 is negative, but if the determination is positive, the operation of the air pump 28 is stopped in S3.

Next, in S4, it is determined whether or not a certain period of time, for example, about 200 ms, has elapsed since the air pump 28 stopped operating. The process waits until the determination in S4 is negative, but if the determination is positive, it is determined in S5 whether or not the operation of the air pump 28 is stopped for the second time. If the determination in S5 is negative, the air pump 28 is operated for the second time by repeatedly executing S1 and subsequent steps. S1-S5 correspond to the compression pressure control means .

If the determination in S5 is affirmative, in S6 the supply pressure PS to the compression band 12, that is, the pressure detected by the pressure sensor 24 while the air pump 28 is in operation, is successively obtained at a predetermined sampling period, and the rate of change of the supply pressure PS is calculated. are sequentially obtained.

Next, in S7, it is determined whether or not the change rate of the supply pressure PS is equal to or less than the threshold value A1. This threshold A1 is a preset value for determining the critical point PL. If the determination in S7 is negative, in S11, an abnormality process or re-determination is performed. If the determination in S7 is affirmative, in S8, the critical point reaching supply pressure ΔP1 when reaching the critical point PL1 used in the first cycle and the critical point reaching from the start of supply of the supply pressure PS until reaching the critical point PL1 From time Δt1, the type of compression wrap 12 is determined, for example, based on a pre-stored map shown in FIG.

In S9, the critical point PL1 of the first supply pressure PS and the critical point PL2 of the second supply pressure PS are compared to determine whether or not there is reproducibility. For example, the critical point reaching supply pressure ΔP2 when reaching the critical point PL2 used in the second cycle obtained when the supply pressure PS rises in the second cycle, and the time from the start of supply of the supply pressure PS to reaching the critical point PL2 The critical point reaching time Δt2, the critical point reaching supply pressure ΔP1 when reaching the critical point PL obtained when the supply pressure PS rises in the first cycle, and the time from the start of supply of the supply pressure PS to reaching the critical point PL1 It is compared with the critical point arrival time Δt1. Reproducible based on whether the difference in supply pressure to reach critical point (ΔP1-ΔP2) and the difference in time to reach critical point (Δt1-Δt2) are respectively below respective preset reproducibility criteria It is determined whether or not

If the determination in S9 is negative, S11 is executed, but if the determination in S9 is positive, in S10, the type of the compression band 12, for example, the size of the compression band, is set to the critical point reaching supply pressure ΔP1 or ΔP2. , and critical point arrival time Δt1 or Δt2. S6-S10 correspond to the compression band size determination means 44. FIG. In S11, abnormality processing or re-determination is performed. For example, the blood pressure measurement is automatically stopped and abnormality processing is executed to display an abnormality in the judgment of the compression wrap 12, or S1 and subsequent steps are executed and the type of compression wrap 12 is re-determined.

As described above, according to the automatic blood pressure measuring device 10 of the present embodiment, the connector 20 connected via the flexible tube 18 to the compression band 12 wrapped around the upper arm 16 (a part of the living body) is detachable. and a pressure sensor 24 that detects the pressure between the socket 22 and an air pump (compressible fluid supply source) 28. An automatic blood pressure measuring device 10 for determining the blood pressure value of a living body based on changes in amplitude values of pulse waves sequentially generated in synchronism with the pulse of the upper arm 16, wherein the type of compression cuff 12 is inserted in the connector 20. , and have different effects on the compressive fluid passing through the connector 20 depending on the type of the compression band 12; Compressive pressure control means 42 for stopping the supply of the compressible fluid after a period of time, and the supply pressure PS of the compressive fluid by the compressive pressure control means 42 is determined by the supply flow rate of the compressive fluid by the compressive pressure control means 42 and the pressure to the compression band 12. Based on the critical point reaching supply pressure ΔP when reaching the critical point where the inflow rate of the compressible fluid is equal, and the critical point reaching time Δt from the start of the supply of the compressible fluid to the critical point, the compression band and compression band size determination means 44 for determining 12 types. As a result, the type of compression wrap 12 can be identified without using a pin to which identification code information for the compression wrap is attached. In addition, since the compression band 12 is not affected by poor electrical contact, the compression band 12 is not misidentified, and the socket 22 does not have a complicated structure or increase in size.

Further, according to the automatic blood pressure measuring device 10 of the present embodiment, the compression pressure control means 42 allows the pressure control means 42 to When pressure is supplied to the compression band 12, the compression band size determination means 44 determines that the pressure PS supplied by the compression pressure control means 42 is equal to the flow rate supplied by the compression pressure control means 42 and the flow rate into the compression band at the connector 20. The type of the compression band 12 is determined based on the critical point reaching supply pressure ΔP when reaching the critical point PL and the critical point reaching time Δt from the start of supply of the supply pressure PS to reaching the critical point PL . As a result, the compression band 12 is not affected by poor electrical contact, so that the compression band 12 is not misidentified, and the socket 22 does not have a complicated structure or increase in size.

Further, according to the automatic blood pressure measuring device 10 of the present embodiment, the connector 20 includes a first tubular plug 20 a inserted into the connector 20 and a second tubular plug 20 a inserted into the end of the flexible tube 18 connected to the compression band 12 . Two tubular plugs 20b and a connector body 20c that connects the first tubular plug 20a and the second tubular plug 20b and accommodates at least one of the diaphragm element R and the buffer element B are integrally provided. As a result, the connector 20 does not require a complicated structure for providing pins with identification code information, so that the size of the connector 20 can be reduced and reliability for determining the type of the compression wrap 12 can be obtained.

Further, according to the automatic blood pressure measuring device 10 of the present embodiment, the compression band size determining means 44 determines the supply pressure (supply pressure reaching critical point) ΔP when the supply pressure PS reaches the critical point PL, and A predetermined correspondence between the time from start to reaching the critical point PL (critical point arrival time) Δt and the compression wrap size of the compression wrap 12 is stored, and the supply pressure PS reaches the critical point PL. From the supply pressure (critical point reaching supply pressure) ΔP and the time (critical point reaching time) Δt from the start of pressure supply to reaching the critical point PL, based on the correspondence (map), the compression belt 12 determine the compression garment size. As a result, the type of the compression band 12 can be identified without using identification code information, so that reliability is enhanced compared to the case where pins with identification code information are provided in the connector.

Further, according to the automatic blood pressure measuring device 10 of the present embodiment, the pulse wave obtained from the pressure oscillation of the compression garment 12 generated during the slow pressure drop period in which the compression pressure PC applied to a part of the living body by the compression garment 12 is gradually decreased. A blood pressure value determining means 46 is provided for determining the blood pressure value of the living body based on changes in the magnitude of the signal SM. The amount of discharge from the compression band 12 is controlled according to the type of band 12 . As a result, the amount of discharge during the slow depressurization period is controlled according to the type of the compression band 12. Therefore, even if the type of the compression band 12 is different, the depressurization rate during the slow depressurization period is controlled to a speed suitable for blood pressure measurement. be done.

Further, according to the automatic blood pressure measuring device 10 of the present embodiment, the compression pressure control means 42, prior to the gradual pressure drop period, applies the compression band 12 to a part of the living body until bleeding stops. The amount of air supplied to the compression band 12 is controlled according to the type of compression band 12 determined by the size determination means 44 . As a result, the amount of air supplied during the compression period is controlled according to the type of the compression band 12. Therefore, even if the type of the compression band 12 is different, the pressure increase rate during the compression period is controlled to a speed suitable for blood pressure measurement. .

Although one embodiment of the present invention has been described in detail above with reference to the drawings, the present invention is also applicable to other aspects.

For example, in the above-described embodiment, the air pump 28 is provided as the supply source of the compressible fluid. good.

Also, in the above-described embodiment, the socket 22 was provided in the blood pressure measuring device main body 14 , but it may be provided at the distal end of the tube connected to the blood pressure measuring device main body 14 .

It should be noted that the present invention can adopt various other aspects without departing from the gist thereof.

10: Automatic blood pressure measuring device 12: Compression band 16: Upper arm (part of living body)
18: flexible tube 20: connector 20a: first tubular plug 20b: second tubular plug 20c: connector body 22: socket 24: pressure sensor 28: air pump (source)
42: compression pressure control means 44: compression band size determination means 46: blood pressure value determination means PC: cuff pressure (compression pressure)
PS: supply pressure B, B1, B2: buffer element (fluid circuit element)
R, R1, R2: diaphragm element (fluid circuit element)
PL, PL1, PL2: Critical points ΔP, ΔP1, ΔP2: Critical point reaching supply pressure Δt, Δt1, Δt2: Critical point reaching time SM: Pulse wave signal

Claims (6)

Detects pressure between a socket into which a plug of a connector connected via a flexible tube to a compression band wrapped around a part of the living body is detachably inserted, and the socket and a supply source of compressible fluid. A blood pressure value of the living body based on a change in the amplitude value of the pulse wave sequentially generated in synchronization with the pulse of the living body, which is detected in the process of gradually changing the compression pressure of the compression band. An automatic blood pressure measuring device that determines
A throttle element having a cross-sectional flow area smaller than that of the plug and a cross-sectional flow area larger than that of the plug are provided in the connector corresponding to the type of compression band. a fluidic circuit element having a buffer element that affects the compressible fluid passing through the connector for each type of compression garment;
compression pressure control means for supplying the compressible fluid to the compression band and stopping the supply of the compressible fluid after a predetermined time;
The supply pressure of the compressible fluid by the compression pressure control means has reached a critical point where the flow rate of the compressible fluid supplied by the compression pressure control means and the inflow flow rate of the compressible fluid into the compression band are equal. compression band size determination means for determining the type of the compression band based on the critical point reaching supply pressure and the critical point reaching time from the start of the supply of the compressible fluid to the critical point, An automatic blood pressure measuring device, comprising: The connector comprises a first tubular plug inserted into the socket, a second tubular plug inserted into the end of a flexible tube connected to the compression band, the first tubular plug and the second tubular plug. and a connector body that accommodates a fluid circuit element that exerts different effects on the compressible fluid passing through the connector depending on the type of compression band. 1 automatic blood pressure measuring device. The compression band size determination means stores a predetermined correspondence relationship between the critical point reaching supply pressure and the critical point reaching time, and the type of the compression band, and stores the actually obtained critical point reaching 3. The automatic blood pressure measuring device according to claim 1, wherein the pressure band size of the compression band is determined based on the corresponding relationship from the supply pressure and the critical point arrival time. The automatic blood pressure measuring device according to any one of claims 1 to 3, wherein the supply pressure of said compressible fluid is a value detected by said pressure sensor. The blood pressure value of the living body is calculated based on the change in the magnitude of the pulse wave signal obtained from the pressure oscillation of the compression band which occurs during the slow pressure drop period in which the pressure applied to the part of the living body by the compression band is gradually lowered. Having a blood pressure value determining means for determining,
The compression pressure control means controls the discharge amount of the compressible fluid from the compression cuff in accordance with the type of the compression cuff determined by the compression cuff size determination means during the slow depressurization period. The automatic blood pressure measuring device according to any one of claims 1 to 4. The compression pressure control means controls the type of the compression wrap determined by the compression wrap size determination means during the compression period in which the part of the living body is pressed until bleeding stops with the compression wrap prior to the slow pressure drop period. 6. The automatic blood pressure measuring device according to claim 5, wherein the supply amount of said compressible fluid to said compression cuff is controlled according to .

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