JP2007135717A - Electronic blood pressure manometer with analog display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately measure the blood pressure without being affected by the delay of the reactive time of a measuring person in measuring the blood pressure while listening to the Korotkoff sounds. <P>SOLUTION: The blood pressure manometer comprises: a cuff; a pressurizing means; a depressurizing means; a pressure sensor for detecting the pressure of the cuff; an analog display for electronically displaying the pressure of the cuff in a bar graph along a scale; a means for detecting pulse waves based on the detected pressure data; a means for holding the pressure value detected when the climbing of the pulse waves is detected; an external input switch for generating an external input signal by the manual operation; and a blood pressure determining means for determining the pressure value when the pulse wave climbs just before the time when a first external input signal is input from the external input switch in the process of measuring the blood pressure as the maximal blood pressure and determining the pressure value when the pulse wave climbs just before the time when a second external input signal is input thereafter as the minimal blood pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic sphygmomanometer including an analog display capable of electronic bar graph display imitating a mercury column, for example.

  Conventionally, a mercury column type sphygmomanometer has been generally used in the medical field. A mercury column type sphygmomanometer is composed of a mercury column type pressure gauge, a cuff wound around the upper arm, a pressurizing means (generally a rubber ball) for pressurizing the cuff, and a decompression means (exhaust valve) for depressurizing the cuff. When measuring the blood pressure of the measurement subject, the maximum blood pressure and the minimum blood pressure are determined by reading the mercury column while listening to the pulse of the arm with a stethoscope.

  Specifically, after pressurizing the cuff wrapped around the upper arm above the maximum blood pressure, gradually reduce the pressure, listen to Korotkoff sounds with a stethoscope during the decompression process, and listen to the systole and diastole separately At the timing, the scale at the upper end of the mercury column is read, and the systolic timing reading is detected as the maximum blood pressure, and the diastolic timing reading is detected as the minimum blood pressure.

  By the way, although a mercury column type sphygmomanometer has been used for a long time in the medical field, a sphygmomanometer that replaces the mercury column type sphygmomanometer has been desired in response to recent environmental problems.

  Recently, digital display electronic sphygmomanometers have been developed as an alternative to mercury column sphygmomanometers, but for those who have long been familiar with mercury sphygmomanometers, digital displays that are far from mercury columns are There was a situation that it was difficult to get used to.

  In response to such circumstances, an electronic sphygmomanometer has been developed that can display the cuff pressure value as an analog bar graph simulating a mercury column (see, for example, Patent Document 1).

  The electronic sphygmomanometer described in Patent Document 1 includes a cuff, a pressurizing unit, a decompressing unit, a pressure sensor, an interrupt switch for giving an interrupt signal to the systolic and diastolic timings detected by a stethoscope, a mercury column And a digital display capable of digitally displaying the maximum blood pressure and the minimum blood pressure as the pressure values detected by the pressure sensor and the measurement results.

  According to this electronic sphygmomanometer, you can listen to Korotkoff sounds with a stethoscope while looking at the bar graph on the analog display, and operate the interrupt switch at the timing judged to be systole and diastole. Blood pressure can be displayed on a digital display.

Japanese Unexamined Patent Publication No. 2000-70231 (FIGS. 6 and 8)

  By the way, as in the electronic sphygmomanometer described in Patent Document 1, when the measured pressure value of the cuff at the timing when the measurer operates the interrupt switch is determined as the maximum blood pressure and the minimum blood pressure, the measurer uses a stethoscope to make the Korotkoff There is an unavoidable time lag (reaction time delay) between the timing at which the sound is read and the scale value is read and the timing at which the operator actually operates the interrupt switch. There is a problem that a slight deviation occurs from the measurement result output later, resulting in lack of accuracy.

  Therefore, in Patent Document 1, it is proposed to calibrate and process the delay of the reaction time by the measurer. However, in the technique described in Patent Document 1, with regard to the systolic pressure (maximum blood pressure), an adjustment amount (ratio through which air escapes × 0.5 second reaction time) was added to the cuff pressure at the time when the interrupt switch was turned on. The value is adopted as the decision value (systolic pressure), and for the diastolic pressure (minimum blood pressure), when there is a slight pressure fluctuation corresponding to the pulse pressure, the pulse signal is sent at the timing of the fluctuation. When the pulse signal is generated, the cuff pressure is stored in the record 1 and the contents of the previous record 1 are stored in the record 2, and when the measurer hears the expansion period and turns on the interrupt switch, The content of record 2 is adopted as the diastolic pressure (minimum blood pressure) and is displayed on the display. Therefore, although the delay of the reaction time by the measurer is taken into account, there is still a possibility that the accuracy is still lacking.

  In consideration of the above circumstances, the present invention is an electronic sphygmomanometer having a display function for displaying the cuff pressure in an analog form. When measuring the systolic blood pressure and the diastolic blood pressure while listening to the Korotkoff sound with a stethoscope, It is an object of the present invention to provide an electronic sphygmomanometer that can accurately measure blood pressure regardless of a delay in a person's reaction time.

  An electronic sphygmomanometer according to a first aspect of the present invention includes a cuff wound around a blood pressure measurement site, a pressurizing unit that pressurizes the cuff, a depressurizing unit that depressurizes the cuff, and an electric output by detecting the pressure of the cuff. A pressure sensor that emits a pressure, a cuff pressure detection value detected by the pressure sensor, an analog display that electronically displays a bar graph along a scale, and a pulse of the measurement subject based on the detection data of the pressure sensor. Means for detecting a wave, data holding means for holding the detected value of the pressure sensor when the rise of the pulse wave is detected by the pulse wave detecting means, and an external input switch for generating an external input signal by manual operation In the decompression process of the cuff for blood pressure measurement, the value held by the data holding means immediately before the timing when the first external input signal is input by the external input switch is set to the highest blood pressure. And the blood pressure determination means for determining the value held by the data holding means immediately before the second external input signal is input as the minimum blood pressure, and the maximum blood pressure and the minimum blood pressure determined by the blood pressure determination means are output. And a means for performing the above.

  According to the first aspect of the present invention, not the pressure sensor value at the timing when the external input switch is operated, but the pressure sensor value at the time of the rise of the pulse wave immediately before that is output as the maximum blood pressure or the minimum blood pressure. Therefore, it is possible to determine an appropriate measurement value while taking into account the delay of the measurement person's reaction time. In particular, since the pressure value at the time of the rise of the pulse wave is used, it is possible to always determine an appropriate measurement value regardless of the amplitude of the pulse wave.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of an electronic sphygmomanometer according to an embodiment, in which (a) is an external view and (b) is a block diagram. FIG. 2 is a front view of the sphygmomanometer body, and FIG. 3 is an explanatory diagram of the configuration of the analog display of the sphygmomanometer body.

  This electronic sphygmomanometer includes a sphygmomanometer body 1, a cuff 2 wound around a blood pressure measurement site, and a tube 3 that connects the tube connection port 19 of the sphygmomanometer body 1 and the cuff 2.

  The sphygmomanometer body 1 includes a pressurizing unit (pressurizing pump) 11 that pressurizes the cuff 2, a decompressing unit (depressurizing valve) 12 that depressurizes the cuff 2, and detects the pressure of the cuff 2 to generate an electrical output. Pressure sensor 13, start switch 17 for starting blood pressure measurement, external input switch (set switch) 18 for giving an external input signal by manual operation, and length of display body 15B electronically displayed along scale 15A Thus, the analog display 15 that displays the pressure value detected by the pressure sensor 13, the digital display 16 that displays the pressure value detected by the pressure sensor 13, the power switch 20, the power lamp 22, and the manual measurement mode. A mode changeover switch 21 for switching the automatic measurement mode, a dial switch 23 for adjusting the upper limit of pressure applied to the cuff 2 by the pressurizing means 11, And a control unit 14 for controlling, is provided.

  The switches 17, 18, 20, 21, 22, 23, and the power lamp 22 are mounted on the outer surface of the main body case 10. Further, the pressurizing means 11, the decompression means 12, the pressure sensor 13, and the control device 14 are provided inside the main body case 10. In addition, the analog display 15 and the digital display 16 are installed at easy-to-see positions on the front wall of the main body case 10. The set switch 18 and the start switch 17 are provided on the lower side of the analog display 15 and the digital display 16 at positions where they can be easily operated while viewing the display.

  The analog display 15 includes a scale 15A that is swung so that the pressure value increases from the lower side toward the upper side, and a display body 15B that is disposed along the scale 15A. The scale 15A is composed of a scale line in which a pressure of 0 mmHg to 300 mmHg is cut at intervals of 2 mmHg, and a scale value assigned to the scale line every 10 mmHg. As shown in FIG. 3, the display body 15 </ b> B is configured by an alignment body of a large number of segments 15 s that are aligned in the vertical direction and are each defined by a pressure amount having a constant width. In this case, one segment 15s has a bar shape elongated in the horizontal direction orthogonal to the length direction (vertical direction) of the display body 15B, and is defined to correspond to a pressure amount of 1 mmHg or 2 mmHg. The display is turned ON / OFF individually. Here, one segment 15 s is defined as “one display unit” of the analog display 15, and is configured by an LCD, an LED, or the like. Further, a backlight for making the display easy to see is incorporated behind the analog display 15.

  In the example of FIG. 3, one segment 15s is set to correspond to “1 mmHg”. That is, the pressure display resolution is “1 mmHg”. When the pressure display resolution is increased, the number of segments 15s must be increased accordingly. The pressure display resolution of “1 mmHg” requires twice as many segments 15s as the pressure display resolution of “2 mmHg”, which may increase the cost. However, the pressure fluctuation due to the pulse is as accurate as possible. When trying to display, since the amplitude of the pulse wave near the maximum blood pressure or the minimum blood pressure is about 0.5 to 2.0 mmHg, the display resolution of “1 mmHg” is more preferable.

  By the way, the sampling interval of pressure detection by the pressure sensor 13 is on the order of 10 ms (millisecond) (for example, 30 ms), and the resolution of pressure detection (which can be said to be pulse wave detection sensitivity) is at the “0.05 mmHg” level. That is, the resolution is 1 mmHg intervals on the display, but the pressure is detected quite fine internally.

  The analog display 15 is configured such that the segment 15s of the display body 15B is continuously turned on (lighted) from the lower side (position of 0 mmHg), that is, the first segment, the second segment, ... By turning on all the pressure display values such as the nth segment, the pressure values can be displayed in a bar graph as shown in FIG. Therefore, the measurer can intuitively grasp the pressure value by actually reading the length (upper end position) of the display body 15B on the scale 15A rather than the number of the lit segments 15s. it can.

  On the other hand, the digital display 16 is of a segment type that numerically displays a pressure value and a pulse, and has mainly three display portions 16A, 16B, and 16C as shown in FIG. The upper display unit 16A displays a real-time pressure detection value and displays a maximum blood pressure (SYS = systolic blood pressure value) when displaying the measurement result, and the lower display unit 16B displays the measurement result. A portion that sometimes displays the minimum blood pressure (DIA = diastolic blood pressure value), and the lower display portion 16C is a portion that displays the pulse. The upper two display portions 16A and 16B are each constituted by a three-digit 7-segment electrode, and the unit is mmHg. The lower pulse display unit 16C is configured such that the first digit of the three digits is composed of a two-segment electrode, and the last two digits are composed of a seven-segment electrode. The unit is Pul / min. It has become. In addition, the digital display unit 16 is provided with a display unit 16D for displaying the measurement number (number of times).

  Each of these display units 16A to 16D can display numbers from 0 to 9 by selectively causing each segment to emit light. However, only one digit can be displayed in the hundreds digit of the pulse display 16C. Therefore, the measurement result can be directly read by those numerical values.

  The control device 14 has a function for controlling the pressurizing means 11 and the decompression means 12 according to a predetermined program, a function for controlling the display of the analog display 15 and the digital display 16 (corresponding to display control means), and mode switching. A function of switching the manual measurement mode and the automatic measurement mode by operating the switch 21, and a function of detecting a pulse wave by performing arithmetic processing based on detection data of the pressure sensor 13 in the pressure reduction process of the cuff 2 for blood pressure measurement (pulse Equivalent to the wave detection means), the function of storing and holding the detected value of the pressure sensor 13 when the rise of the pulse wave is detected (corresponding to the data holding means), and the blood pressure when the automatic measurement mode is selected. A machine for determining the systolic blood pressure and the systolic blood pressure by performing arithmetic processing based on the detection data of the pressure sensor 13 during the decompression process of the cuff 2 for measurement. (Corresponding to blood pressure determination means) and the time when the first external input signal is input by the external input switch 18 during the pressure reduction process of the cuff 2 for blood pressure measurement when the manual measurement mode is selected. A function (blood pressure) for determining the pressure holding value at the time of the immediately preceding rise of the pulse wave as the maximum blood pressure and the pressure holding value at the time of the rising of the pulse wave immediately before the timing when the second external input signal is input as the minimum blood pressure. (Corresponding to determination means) and a function for displaying the maximum blood pressure and the minimum blood pressure numerically on the digital display 16 (corresponding to means for outputting the determination result) after determining the maximum blood pressure and the minimum blood pressure (included in the display control function) ) And.

  Among the above functions, the function of detecting the pulse wave (corresponding to the pulse wave detecting means) is at least based on the detection data by the pressure sensor 13 in the decompression process for blood pressure measurement, as shown in FIG. The rising point Pt of the wave P is determined. The rising point Pt of the pulse wave P is determined when the pressure detection value changes from a certain downward trend to an increase. The condition is that a predetermined pressure (for example, 0.2 mmHg) or more has risen within a predetermined time (for example, 100 ms). For example, when the sampling value of the pressure sensor 13 rises to a predetermined pressure or more from the immediately preceding value twice consecutively, it is determined as the rising point Pt of the pulse wave P.

  The Korotkoff sound is usually generated in the range B from the rise of the pulse wave P to the peak Pp. The timing when the measurer presses the external input switch 18 while listening to the Korotkoff sound with a stethoscope is usually the peak of the pulse wave P. This is the range of C after the vicinity of Pp. The timing at which the external input switch 18 is pressed varies depending on the person to be measured. If the cuff pressure at that timing is determined as, for example, the maximum blood pressure or the minimum blood pressure, there is a risk that variations will occur and the accuracy will be lacking. .

  Therefore, in the electronic sphygmomanometer of the present embodiment, when the manual measurement mode is selected, the pressure detection value (Pt) of the rising point Pt of the pulse wave P immediately before the timing when the external input signal is input by the external input switch 18 ( For example, this value is stored in the memory) is determined as the systolic blood pressure or the systolic blood pressure, and the delay of the reaction time by the measurer is corrected. In other words, the pressure detection value at the rising point Pt of the pulse wave P immediately before is always set to the highest blood pressure regardless of the point of time C in the range of C that is expected to be operated by the measurer. Or diastolic blood pressure.

Next, the operation will be described.
First, a case where the mode changeover switch 21 is switched to the “M (Manual)” side and blood pressure measurement is performed manually will be described. As a process common to both the manual and automatic modes, first, the cuff 2 is wound around the upper arm of the person to be measured, and the dial switch 23 for adjusting the pressurization upper limit value is set to an appropriate value higher than the subject's maximum blood pressure value. Then, the start switch 17 is pressed. Then, the operation proceeds according to a predetermined program. First, the pressurizing means 11 sends pressurized air to the cuff 2 and the cuff 2 gradually presses the upper arm. Pressurization automatically stops at the stage where the pressure exceeds the pressure set by the dial switch 23 for adjusting the pressurization upper limit value, and the decompression means 12 gradually begins to decompress the cuff 2.

  In the manual mode, in this decompression process, the measurer listens to the Korotkoff sound by applying a stethoscope to the measurement subject's arm while observing the pressure display (bar graph display) of the analog display 15.

  Then, while reading the pressure display value of the analog indicator 15 at the timing when the heart systole is heard based on the Korotkoff sound (that is, the timing when the compression is weakened and the Korotkoff sound starts to be heard) This is a standard operation when using a sphygmomanometer, and is not necessarily a necessary action in the case of this embodiment), and an external input switch (set switch) 18 is pressed. Then, a first external input signal is generated, and the control device 14 determines and stores the blood pressure display value (pressure value) at the rising point Pt of the pulse wave P immediately before that timing as “maximum blood pressure”.

  After that, while reading the pressure display value of the analog display 15 at the timing when it is determined as the diastole of the heart based on the Korotkoff sound (that is, when the Korotkoff sound is not heard again because the pressure is further weakened) This is a standard operation when using a mercury column type sphygmomanometer, and is not necessarily required in the case of this embodiment), and the external input switch (set switch) 18 is pressed. Then, a second external input signal is generated, and the control device 14 determines and stores the blood pressure display value (pressure value) at the rising point Pt of the pulse wave P immediately before the timing as “minimum blood pressure”.

  Then, the control device 14 causes the digital display 16 to numerically display the maximum blood pressure and the minimum blood pressure when the maximum blood pressure and the minimum blood pressure are determined.

  On the other hand, in the automatic measurement mode in which the mode changeover switch 21 is switched to the “A (AUTO)” side, the detection data of the pressure sensor 13 is automatically generated by the control device 14 when the pressure reduction process is performed. Based on this, the systolic blood pressure and the diastolic blood pressure are calculated. The principle of blood pressure determination includes those based on pulse pressure and those based on Korotkoff sounds, both of which are well-known techniques, and are not specifically described here. As in the manual mode, the control device 14 causes the digital display 16 to numerically display the maximum blood pressure and the minimum blood pressure when the maximum blood pressure and the minimum blood pressure are determined.

  In addition, as an example of the output of the measurement result of the systolic blood pressure and the systolic blood pressure, in addition to displaying on the digital display 16 as described above, it is possible to print on paper with a printer, It can be displayed as a length.

(A) is a schematic block diagram of the electronic blood pressure monitor of embodiment of this invention, (b) is a block diagram which shows a structure. It is a front view of the sphygmomanometer body 1 of the electronic sphygmomanometer of the embodiment. It is a block diagram of an analog display in the electronic blood pressure monitor of the embodiment. In the electronic sphygmomanometer according to the embodiment, an explanatory diagram showing a relationship between a pulse wave, a range in which Korotkoff sounds are observed, and a predicted range in which an external input switch is operated, and (a) shows an overall pressure change. FIG. 2B is an enlarged view of a part thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sphygmomanometer body 2 Cuff 11 Pressurizing means 12 Depressurizing means 13 Pressure sensor 14 Control device 15 Analog display 15A Scale 15B Display 16 Digital display 18 External input switch (set switch)
P Pulse wave Pt Pulse wave rising edge judgment point

Claims (1)

A cuff wrapped around the blood pressure measurement site;
A pressurizing means for pressurizing the cuff;
Decompression means for decompressing the cuff;
A pressure sensor that detects the pressure of the cuff and generates an electrical output;
An analog indicator that electronically displays the pressure detection value of the cuff detected by the pressure sensor along a scale, and
Means for detecting a pulse wave of the person to be measured based on detection data of the pressure sensor;
Data holding means for holding the detected value of the pressure sensor when the rise of the pulse wave is detected by the pulse wave detecting means;
An external input switch that generates an external input signal by manual operation;
In the cuff decompression process for blood pressure measurement, the value held by the data holding means immediately before the timing when the first external input signal is input by the external input switch is set as the maximum blood pressure, and the second external input thereafter. Blood pressure determination means for determining the value held by the data holding means immediately before the input signal is input as the minimum blood pressure;
Means for outputting the highest blood pressure and the lowest blood pressure determined by the blood pressure determining means;
An electronic sphygmomanometer equipped with an analog display.

Images