JP6487756B2 - Sphygmomanometer - Google Patents

Description

  The present invention relates to a sphygmomanometer having an air balloon.

  There is a sphygmomanometer that inflates the cuff by sending air to the cuff using an air balloon, presses the arm or the like with sufficient pressure, and then measures the blood pressure while reducing the pressure. By repeating the operation of strengthening or loosening the force to grip the air balloon, air can be sent to the interior space of the cuff and the pressure in the interior space can be increased. The pressure in the interior space of the cuff has a correlation with the force with which the cuff presses the arm or the like. The pressure in the interior space of the cuff can generally be expressed more simply as the pressure of the cuff, but in this specification, the expression of the pressure in the interior space of the cuff is used as a strict expression.

  When the air balloon is gripped and crushed, air is sent to the cuff, and when the force for grasping the air balloon is relaxed, air is sucked into the air balloon from the outside. For such an operation, in the process of increasing the pressure in the internal space of the cuff while operating the air balloon, the pressure increases while repeating the increase and the small decrease.

  In Patent Document 1, a straight line connecting the pressure rising point and the next pressure rising point is obtained, and when the detected pressure Pn by the pressure sensor exceeds the pressure Pcn given by this straight line, Pcn is displayed and not exceeded. Sometimes a sphygmomanometer displaying Pn is described.

JP 2002-360524 A

  In the sphygmomanometer described in Patent Document 1, since the pressure to be displayed is determined based on the straight lines defined by the two most recent pressure rising points, the pace at which the air balloon (rubber ball) is operated is halfway As it changes, the difference between the displayed pressure and the actual pressure can increase. For example, if the pace at which the air balloon is operated suddenly slows, Pn does not exceed Pcn, and Pn can be displayed as it is. When Pn is displayed as it is, the displayed pressure repeatedly rises and falls. A user such as a doctor or nurse needs to increase the pressure in the cuff's internal space to a pressure slightly higher than the assumed maximum blood pressure value of the subject, but the displayed pressure repeatedly increases and decreases. Therefore, it is difficult to correctly determine when to stop the operation of the air balloon.

  An object of the present invention is to provide a sphygmomanometer that makes it easy to determine when to stop the operation of a balloon.

One aspect of the present invention includes an air balloon for sending air to the interior space of the cuff, a display unit, a pressure sensor for detecting the pressure in the interior space, and a valve for decompressing the interior space. The sphygmomanometer includes a control unit that calculates a pressure in the internal space based on an output from the pressure sensor and displays the pressure on the display unit. in the period of raising the pressure in the inner space, wherein the detecting a bottom in the pressure fluctuations in the inner space, wherein in response to detection of the bottom, the display of the display unit as continued display of the pressure of the bottom is started Control.

  ADVANTAGE OF THE INVENTION According to this invention, the blood pressure meter which is easy to judge the timing which should stop operation of an air balloon is provided.

The figure which shows the structure of the blood pressure meter of one Embodiment of this invention. The figure which illustrates the pressure of the internal space of the cuff at the time of measuring a test subject's blood pressure with a blood pressure meter. The figure explaining the detection of the bottom pressure in 1st Embodiment of this invention, and the update of a display exemplarily. The figure which illustrates the detection method of the bottom pressure in 1st Embodiment of this invention. The figure which illustrates operation | movement of the blood pressure meter of 1st Embodiment of this invention. The figure which shows exemplarily the process including the detection and display of the inflection point pressure in 2nd Embodiment of this invention. The figure which illustrates the detection method of the peak in 2nd Embodiment of this invention. The figure which illustrates the detection method of the first inflection point after the peak in 2nd Embodiment of this invention. The figure which illustrates operation | movement of the blood pressure meter of 2nd Embodiment of this invention.

  Hereinafter, the present invention will be described through exemplary embodiments thereof with reference to the accompanying drawings.

  FIG. 1 shows the configuration of a sphygmomanometer 1 according to one embodiment of the present invention. The sphygmomanometer 1 can send air to the internal space 12 of the cuff 10 via the tube 20 and the flow path 310 and the main body 30 having the flow path 310 communicating with the internal space 12 of the cuff 10 via the tube 20. The air balloon 40 is connected to the main body 30 as described above. The sphygmomanometer 1 may further include a pressure sensor 320, a valve 330, an operation unit 340, a control unit 350, a display unit 360, and a buzzer 370. The pressure sensor 320 is connected to the flow path 310 so that the pressure in the internal space 12 of the cuff 10 can be detected. The valve 330 is connected to the flow path 310 so that the internal space 12 of the cuff 10 can be decompressed. The operation unit 340 includes, for example, switches and buttons for power on / off, mode setting, and the like. The display unit 360 displays, for example, the state of the sphygmomanometer 1, the pressure in the internal space 12 of the cuff 10, the measured blood pressure, and the like. The buzzer 370 is used to notify an error or the like.

  The control unit 350 calculates the pressure of the internal space 12 of the cuff 10 based on the output from the pressure sensor 320 and displays it on the display unit 360. Here, the control unit 350 detects a feature point in the pressure fluctuation of the inner space 12 of the cuff 10 during a period in which the pressure of the inner space 12 of the cuff 10 is increased by the operation of the air balloon 40, and responds to the detection of the feature point. Thus, the display of the display unit 360 is controlled so that the continuous display of the pressure of the feature point is started.

  In the first embodiment of the present invention, the feature point is the bottom in the pressure fluctuation of the internal space 12 of the cuff 10. In the second embodiment of the present invention, the feature point is the first inflection point after the peak in the pressure fluctuation of the internal space 12 of the cuff 10.

  In the following, first, a first embodiment of the present invention will be described. In the first embodiment, the controller 350 controls the bottom pressure (hereinafter referred to as “bottom pressure”) in the pressure fluctuation of the internal space 12 of the cuff 10 during the period in which the pressure of the internal space 12 of the cuff 10 is increased by the operation of the air balloon 40. )) Is detected as the pressure of the feature point, and in response to the detection of the bottom pressure, the display of the display unit 360 is controlled so that the continuous display of the bottom pressure is started. In the first embodiment of the present invention, the control unit 350, for example, displays the latest bottom pressure (that is, the newly detected bottom pressure) each time the bottom pressure is detected. Update the display.

  FIG. 2 exemplarily shows the pressure in the internal space 12 of the cuff 10 when the blood pressure of the subject is measured by the sphygmomanometer 1. In FIG. 2, the horizontal axis is time, and the vertical axis is the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320. When the power switch of the operation unit 340 is operated, the power is turned on, and then the air balloon 40 is operated (repeating the operation of strongly grasping and releasing the grip), and the pressure in the internal space 12 of the cuff 10 increases. At time t10 when it is determined that the predetermined value TH has been exceeded, the bottom pressure detection and display processing is started. This process is continued until time t11 when it is determined that the operation of the air balloon 40 has been stopped. That is, bottom pressure detection and display processing is executed in a period TP from time t10 to time t11. When it is determined that the operation of the air balloon 40 has been stopped, blood pressure measurement (typically, detection of the highest blood pressure value and the lowest blood pressure value) is started. The blood pressure is measured based on a change in pressure detected by the pressure sensor 320, for example.

  With reference to FIG. 3, detection of bottom pressure and update of display in the period TP will be described. In FIG. 3, the horizontal axis represents time, and the vertical axis represents the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320 (more specifically, the control unit 350 performs calculation based on the output of the pressure sensor 320. Obtained pressure). In FIG. 3, the pressure in the internal space 12 is shown by a curve, but the pressure is typically a discrete value. The control unit 350 samples the output (signal) from the pressure sensor 320 at a predetermined sampling interval, and calculates the pressure in the internal space 12 of the cuff 10 based on the sampled output. As a more specific example, the control unit 350 obtains a pressure corresponding to the output by, for example, multiplying the sampled output by a conversion coefficient or referring to a lookup table.

  The numerical sequence of the pressure in the internal space 12 of the cuff 10 obtained in this way indicates pressure fluctuation. The control unit 350 detects the bottom pressure in the pressure fluctuation as the pressure of the feature point, and displays the latest bottom pressure (that is, the newly detected bottom pressure) each time the bottom pressure is detected. The display on the display unit 360 is updated. That is, when the bottom pressure is detected, the pressure displayed on the display unit 360 is updated so that the bottom pressure is displayed, and the display of the pressure is maintained until the bottom pressure is next detected. .

  The bottom pressure detection method will be exemplarily described with reference to FIG. In FIG. 4, the horizontal axis represents time, and the vertical axis represents the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320 (more specifically, based on the output of the pressure sensor 320, the control unit 350 performs computation). Obtained pressure). 4 indicates the pressure obtained by sampling the output of the pressure sensor 320, and the curve is shown for convenience.

  In the example shown in FIG. 4, the control unit 350 determines that the difference Pc−Pp between the latest pressure Pc and the previous pressure Pp is continuously lower than the threshold value TH1 (negative value) twice. It is detected that a pressure drop in the internal space 12 of the cuff 10 has occurred. In the example shown in FIG. 4, it is detected that a pressure drop in the internal space 12 of the cuff 10 has occurred at time t1. After time t1, the pressure is written each time the pressure is obtained based on the output of the pressure sensor 320 to the ring buffer that can hold the pressure for five times.

  Thereafter, the control unit 350 determines that the difference Pc−Pp between the latest pressure Pc and the previous pressure Pp has exceeded the threshold value TH2 (positive value) three times in succession, and determines the internal space 12 of the cuff 10 Detects that a pressure increase occurred. In the example shown in FIG. 4, the difference Pc−Pp initially exceeds the threshold value TH2 at time t2. Then, until time t3, the difference Pc−Pp exceeds the threshold value TH2 for three consecutive times. That is, it is detected that the pressure in the internal space 12 of the cuff 10 has increased at time t3. In response to this, the control unit 350 determines the lowest value of the five pressures held in the ring buffer as the bottom pressure Pb, and the display unit 360 so that the bottom pressure Pb is displayed on the display unit 360. Update the display of. Note that the above criteria and the number of stages of the ring buffer can be changed as appropriate, and the bottom pressure detection method can also be changed as appropriate.

  Next, the operation of the sphygmomanometer 1 according to the first embodiment of the present invention will be described with reference to FIG. In step S501, the power switch is operated by operating the power switch of the operation unit 340, and the sphygmomanometer 1 is activated. Next, in step S502, the control unit 350 causes the display unit 360 to display an initial pressure value (for example, 0 mmHg). Next, in step S <b> 503, the control unit 350 starts real-time display of the pressure in the internal space 12 of the cuff 10. That is, the control unit 350 updates the display of the display unit 360 that displays the pressure every time the pressure of the internal space 12 of the cuff 10 is obtained based on the output of the pressure sensor 320.

  Thereafter, the air balloon 40 is operated (repetition of a strong gripping action and a loosening action), and the pressure in the internal space 12 of the cuff 10 increases. In step S504, the control unit 350 monitors the increase in the pressure in the internal space 12 of the cuff 10 and detects that the air balloon 40 has been operated based on the determination that the pressure has exceeded the reference value.

  Accordingly, in step S505, the control unit 350 closes the valve 330. Thereafter, in step S506, the process waits for the pressure in the internal space 12 of the cuff 10 to exceed the predetermined value TH. If the pressure in the internal space 12 of the cuff 10 exceeds the predetermined value TH, the process proceeds to step S507, and the pressure is displayed in real time. Cancel.

  Subsequent steps S508 to S510 are processing in the period TP in FIG. In step S508, as described with reference to FIGS. 3 and 4, the control unit 350 detects the bottom pressure, and when the bottom pressure is detected, the process proceeds to step S509. In step S509, the control unit 350 causes the display unit 360 to display the detected bottom pressure as the pressure in the internal space 12 of the cuff 10. Next, in step S510, the control unit 350 determines whether or not the operation (pressurization) of the air balloon 40 has been stopped. If it is determined that the operation of the air balloon 40 has been stopped, the process proceeds to step S511. Return to step S508. That is, the detection of the bottom pressure is continued until it is determined that the operation of the air balloon 40 has been stopped. That the operation of the air balloon 40 has been stopped can be determined based on the fluctuation of the pressure in the internal space 12 of the cuff 10. For example, when the bottom pressure is not detected for a predetermined period, the operation of the air balloon 40 is performed. Can be determined to have been stopped.

  In steps S508 to S510, as described above, the display of the display unit 360 is updated so that the bottom pressure is displayed every time the bottom pressure is detected, and the display is maintained until the next bottom pressure is detected. As a result, a lower pressure than the actual pressure is displayed on the display unit 360. Therefore, a user such as a doctor or a nurse can easily determine when to stop the operation of the air balloon. This prevents the operation for pressurization from being stopped when the pressure is insufficient.

  In step S <b> 511, the control unit 350 resumes real-time display of the pressure in the internal space 12 of the cuff 10. That is, the control unit 350 updates the display of the display unit 360 that displays the pressure every time the pressure of the internal space 12 of the cuff 10 is obtained based on the output of the pressure sensor 320.

  Next, in step S512, the valve 330 is opened, and the decompression of the internal space 12 of the cuff 10 is started. In step S513, the blood pressure is measured. In step S514, the internal space 12 of the cuff 10 is sufficiently exhausted. In step S515, the blood pressure measured in step S513 is displayed on the display unit 360.

  Next, a second embodiment of the present invention will be described. Here, it demonstrates centering on difference with 1st Embodiment. Matters not mentioned in the second embodiment can follow the first embodiment. In the second embodiment, the control unit 350 performs the first inflection point after the peak in the pressure fluctuation of the internal space 12 of the cuff 10 during the period in which the pressure of the internal space 12 of the cuff 10 is increased by operating the air balloon 40. The display unit 360 detects the pressure of the inflection point (hereinafter, “inflection point pressure”) as the pressure of the feature point, and starts the continuous display of the inflection point pressure in response to the detection of the inflection point pressure. Control the display of. In the second embodiment of the present invention, the control unit 350, for example, starts displaying the inflection point pressure continuously by the display unit 360 every time an inflection point is detected, and the pressure in the internal space 12 of the cuff 10 is increased. The pressure in the internal space 12 of the cuff 10 is displayed on the display unit 360 in real time in response to exceeding the inflection point pressure after falling below the inflection point pressure.

  In the second embodiment of the present invention, processing including detection and display of the inflection point pressure is executed in the period TP shown in FIG. When it is determined that the operation of the air balloon 40 has been stopped, blood pressure measurement (typically, detection of the highest blood pressure value and the lowest blood pressure value) is started. The blood pressure is measured based on a change in pressure detected by the pressure sensor 320, for example.

  Processing including detection and display of the inflection point pressure in the period TP will be described with reference to FIG. In FIG. 6, the horizontal axis represents time, and the vertical axis represents the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320 (more specifically, the control unit 350 performs calculation based on the output of the pressure sensor 320. Obtained pressure). In FIG. 6, the pressure in the internal space 12 is indicated by a curve, but the pressure is typically a discrete value. The control unit 350 samples the output (signal) from the pressure sensor 320 at a predetermined sampling interval, and calculates the pressure in the internal space 12 of the cuff 10 based on the sampled output. As a more specific example, the control unit 350 obtains a pressure corresponding to the output by, for example, multiplying the sampled output by a conversion coefficient or referring to a lookup table.

  The numerical sequence of the pressure in the internal space 12 of the cuff 10 obtained in this way indicates pressure fluctuation. The control unit 350 detects the first inflection point pressure after the peak in the pressure fluctuation as the pressure of the feature point, and in response to the detection of the inflection point pressure, the continuous display of the inflection point pressure is started. The display of the display unit 360 is controlled as described above. For example, the control unit 350 starts displaying the inflection point pressure continuously by the display unit 360 every time an inflection point is detected, and after the pressure in the internal space 12 of the cuff 10 falls below the inflection point pressure. In response to exceeding the inflection point pressure, the pressure in the internal space 12 of the cuff 10 is displayed on the display unit 360 in real time. In the second embodiment, for example, the control unit 350 is configured to detect a pressure fluctuation peak in the internal space 12 of the cuff 10 and to detect the first inflection point after the peak using the peak as a trigger. sell.

  The peak detection method will be exemplarily described with reference to FIG. In FIG. 7, the horizontal axis represents time, and the vertical axis represents the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320 (more specifically, the control unit 350 performs computation based on the output of the pressure sensor 320. Obtained pressure). The rhombus in FIG. 7 shows the pressure obtained by sampling the output of the pressure sensor 320, and the curve is shown for convenience.

  In the example shown in FIG. 7, the control unit 350 determines that the difference Pc−Pp between the latest pressure Pc and the previous pressure Pp has continuously exceeded the threshold value TH3 (positive value) twice. , It detects that the pressure in the internal space 12 of the cuff 10 is rising. In the example shown in FIG. 7, the difference Pc−Pp continuously exceeds the threshold value TH3 (positive value) twice at time t11. Thereafter, the difference Pc−Pp continues to exceed the threshold value TH3 (positive value) twice in succession, and the pressure in the internal space 12 of the cuff 10 continues to rise.

  Thereafter, the control unit 350 determines that the pressure in the internal space 12 of the cuff 10 is decreasing based on the determination reference that the difference Pc−Pp has continuously decreased below the threshold value TH4 (negative value) at time t13. Detect that. Then, it is determined that there was a pressure fluctuation peak at the second sampling, that is, at time t12. In this way, a peak in pressure fluctuation in the internal space 12 of the cuff 10 can be detected.

  A method for detecting the first inflection point after the peak will be exemplarily described with reference to FIG. In FIG. 8, the horizontal axis represents time, and the vertical axis represents the pressure in the internal space 12 of the cuff 10 detected by the pressure sensor 320 (more specifically, the control unit 350 performs computation based on the output of the pressure sensor 320. Obtained pressure). 8 indicates the pressure obtained by sampling the output of the pressure sensor 320, and the triangle in FIG. 8 is the second derivative of the pressure.

  The controller 350 calculates the second derivative of the pressure in the internal space 12 of the cuff 10 after detecting the peak. Then, the control unit 350 detects an inflection point based on the determination criterion that the second-order differential of the pressure in the internal space 12 of the cuff 10 exceeds the threshold value TH5 (positive value) twice in succession. The inflection point pressure is the pressure in the internal space 12 of the cuff 10 at this inflection point.

  Next, the operation of the sphygmomanometer 1 according to the second embodiment of the present invention will be described with reference to FIG. In step S601, the power switch is operated by operating the power switch of the operation unit 340, and the sphygmomanometer 1 is activated. Next, in step S602, the control unit 350 causes the display unit 360 to display an initial pressure value (for example, 0 mmHg). Next, in step S <b> 603, the control unit 350 starts real-time display of the pressure in the internal space 12 of the cuff 10. That is, the control unit 350 updates the display of the display unit 360 that displays the pressure every time the pressure of the internal space 12 of the cuff 10 is obtained based on the output of the pressure sensor 320.

  Thereafter, the air balloon 40 is operated (repetition of a strong gripping action and a loosening action), and the pressure in the internal space 12 of the cuff 10 increases. In step S604, the control unit 350 monitors the increase in the pressure in the internal space 12 of the cuff 10 and detects that the air balloon 40 has been operated based on the determination that the pressure has exceeded the reference value.

  Accordingly, in step S605, the control unit 350 closes the valve 330. Thereafter, in step S606, the process waits for the pressure in the internal space 12 of the cuff 10 to be greater than the predetermined value TH. If the pressure in the internal space 12 of the cuff 10 has become greater than the predetermined value TH, the process proceeds to step S607.

  Subsequent steps S607 to S611 are processing in the period TP in FIG. In step S607, as described with reference to FIGS. 7 and 8, the control unit 350 detects the first inflection point after the peak, and the first inflection point after the peak is detected. Then, the process proceeds to step S608, and the real-time display of the pressure is stopped.

  Next, at step 609, the control unit 350 determines whether or not the pressure in the inner space 12 of the cuff 10 exceeds the previous inflection point pressure, and the pressure in the inner space 12 of the cuff 10 sets the previous inflection point pressure. If it exceeds, it will progress to step S610 and will restart the real-time display of a pressure.

  Next, in step S611, the control unit 350 determines whether or not the operation (pressurization) of the air balloon 40 has been stopped. If it is determined that the operation of the air balloon 40 has been stopped, the process proceeds to step S612; Return to step S607. That the operation of the air balloon 40 has been stopped can be determined based on the fluctuation of the pressure in the internal space 12 of the cuff 10. For example, when the peak is not detected for a predetermined period, the operation of the air balloon 40 is performed. It can be determined that it has been stopped.

  In steps S607 to S611, as described above, the control unit 350 starts displaying the inflection point pressure continuously on the display unit 360 every time an inflection point is detected, and the pressure in the internal space 12 of the cuff 10 The pressure in the internal space 12 of the cuff 10 is displayed on the display unit 360 in real time in response to the pressure exceeding the inflection point pressure after falling below the inflection point pressure. Therefore, a user such as a doctor or a nurse can easily determine when to stop the operation of the air balloon. This prevents the operation for pressurization from being stopped when the pressure is insufficient.

  Next, in step S613, the valve 330 is opened, and the decompression of the internal space 12 of the cuff 10 is started. In step S614, the blood pressure is measured. In step S615, the internal space 12 of the cuff 10 is sufficiently exhausted. In step S616, the blood pressure measured in step S614 is displayed on the display unit 360.

10: Cuff, internal space 12, 20: tube, 30: body, 40: air balloon, 310: flow

Claims (8)

A sphygmomanometer having an air balloon for sending air to the internal space of the cuff, a display unit, a pressure sensor for detecting the pressure of the internal space, and a valve for decompressing the internal space,
A control unit that calculates the pressure of the internal space based on the output from the pressure sensor and displays the pressure on the display unit,
The display and the control unit, in the transmission period to raise the pressure of the inner space by the operation of the balloon, wherein the detecting a bottom in the pressure fluctuations in the inner space, wherein in response to detection of the bottom, and continued pressure of the bottom Control the display of the display unit so that
A blood pressure monitor characterized by that. The control unit updates the display of the display unit so that the latest bottom pressure is displayed each time the bottom pressure is detected.
The sphygmomanometer according to claim 1 . The controller starts detecting the bottom pressure when the pressure in the internal space becomes greater than a predetermined value, and stops detecting the bottom pressure when it is determined that the operation of the air balloon has been stopped.
The sphygmomanometer according to claim 1 or 2 . The control unit has a ring buffer for holding the pressure in the internal space, and the ring buffer is detected in response to a detected pressure increase in the internal space after a pressure drop in the internal space is detected. The lowest value of the pressure held in the bottom is the pressure of the bottom,
The blood pressure monitor according to any one of claims 1 to 3 , wherein A sphygmomanometer having an air balloon for sending air to the internal space of the cuff, a display unit, a pressure sensor for detecting the pressure of the internal space, and a valve for decompressing the internal space,
A control unit that calculates the pressure of the internal space based on the output from the pressure sensor and displays the pressure on the display unit,
The control unit detects a first inflection point after a peak in pressure fluctuation of the internal space in a period in which the pressure of the internal space is increased by operating the air balloon, and responds to the detection of the inflection point. And controlling the display of the display unit so that the continuous display of the pressure at the inflection point is started,
A blood pressure monitor characterized by that. The control unit starts a continuous display of the pressure at the inflection point by the display unit every time the inflection point is detected, and after the pressure in the internal space falls below the pressure at the inflection point, In response to exceeding the pressure at the inflection point, the pressure in the internal space is displayed on the display unit in real time.
The sphygmomanometer according to claim 5 . The control unit displays the pressure of the internal space on the display unit in real time until the pressure of the internal space becomes larger than a predetermined value.
Sphygmomanometer according to any one of claims 1 to 6, characterized in that. After determining that the operation of the air balloon has been stopped, the control unit displays the pressure of the internal space on the display unit in real time.
Blood pressure monitor according to any one of claims 1 to 7, characterized in that.