JPH0453762Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention is equipped with a cuff into which an endpoint such as a fingertip is inserted, so that the endpoint can be smoothly inserted into and out of the blood pressure sensor before and after blood pressure measurement. Therefore, regarding the sphygmomanometer that applies suction pressure (negative pressure) to the cuff (finger cuff membrane) and adjusts the pressure of the cuff during blood pressure measurement, suction pressure, pressurization, and depressurization can be performed with a single button operation. This article relates to a device that allows this to be carried out.

<Prior Art> Conventionally, a plurality of solenoid valves have been used to control suction, pressurization, and depressurization using a cuff.

<Purpose of the invention> The present invention has a simple structure and can perform cuff pulling pressure control before or after blood pressure measurement, and control of cuff pressure increase and decrease, using only a single button operation. We provide a blood pressure monitor that can be used in

<Example> Hereinafter, the configuration of the present invention will be described with reference to the drawings.

The sphygmomanometer according to the present invention is characterized by a pressure control section, which includes a three-way valve 1, a thrust shaft 2, and a three-way valve 1, as shown in FIGS.
It is provided with an operation button 3 connected with.

Further, in the figure, 4 is a cuff into which a finger is inserted, and when the three-way valve 1 is in the position shown in FIG. A first flow path (the flow of air within the flow path is indicated by an arrow) is open.

When the three-way valve 1 moves as shown in FIG. ) has been developed.

Both FIG. 1 and FIG. 2 show the pump 5.
In FIG. 3, the pump 5 is stopped and the air in the cuff 4 is directed toward the pressure reducing valve 8.

When the operating button 3 is released from the pressed state as shown in FIG. 1 due to the biasing action of the spring 9, it returns to the state before being pressed as shown in FIGS. 2 and 3.

When the operation button 3 is pressed, the pump drive switch 10 is turned on in response. A control circuit, which will be described later, detects this switch-on, drives the pump 5, and then stops driving the pump 5.

In each figure, A represents the suction side pipe of the pump 5, and B represents the discharge side pipe to which the pressure reducing valve 8 is energized. The pump 5 transfers the pressure medium from the suction side tube A to the discharge side tube B.

The first flow path is formed by connecting the cuff 4 and the suction side tube A of the pump 5, and connecting the discharge side tube B of the pump 5 and the air outlet 6.

Further, the second flow path is formed by connecting the air suction port 7 and the suction side pipe body A of the pump 5, and also connecting the discharge side pipe body B of the pump 5 and the cuff 4. Ru.

FIG. 4 shows a pressure control diagram for blood pressure measurement.

The horizontal axis of the figure represents time t, and the vertical axis of the figure represents the pressure P of the cuff 4 (hereinafter referred to as cuff pressure).

First, before starting blood pressure measurement, insert your finger into the cuff 4.
In order to facilitate insertion into a sensor (not shown) provided in the sensor, the operation button 3 is pressed (t ₁ ).

Then, as shown in Figure 1, the first flow path opens,
At the same time, the pump drive switch 10 is turned on, and the pump 5 is driven. The pump 5
Based on the drive of
The flow cuff pressure decreases (t ₂ ). Here, the finger is inserted into the cuff 4 (t ₃ ), and the pressure on the operation button 3 is released.

When the operation button 3 is released, the three-way valve is switched and the flow path changes from FIG. 1 to FIG. 2. Note that even when the operation button 3 is released, the pump 5 continues to be driven. When the cuff pressure rises to P ₁ (t ₄ ), the control circuit maintains the pressure P ₁ for a certain period of time (until t ₅ ) and adjusts the sensor level during this time. This is because the photoplethysmography method is applied to measure blood pressure at terminal sites, and the finger is held between a light-emitting element and a light-receiving element, and blood pressure is measured based on blood flow changes in the blood vessels of the finger. This is because it is necessary to reconcile the differences.

From time _t5 onwards, pressurization continues, and at the time ( _t6 ) when the cuff pressure P rises to the maximum value (predetermined value) _P2 , the drive of the pump 5 is stopped. Along with this, as shown in FIG. 3, the air in the cuff 4 flows into the pressure reducing valve 8 (the air in the cuff 4 flows backward), and the process shifts to a pressure reducing process.

During the decompression process, the amplitude of the photoplethysmogram signal that converts intravascular blood flow changes into electrical signals is determined, and the cuff pressure at the time when the amplitude of the photoplethysmogram signal reaches its maximum (t ₇ ) is determined as the systolic blood pressure. The cuff pressure at the time when the amplitude is at its minimum (t ₈ ) is defined as the diastolic blood pressure.

When the blood pressure measurement is completed (t ₉ ), the operator presses the operation button 3 again to apply suction pressure to the cuff 4 (t ₁₀ ), and removes the finger (t ₁₁ ). In the pressure control system of this embodiment, instantaneous exhaust during pressurization and depressurization can be performed by switching to a suction state.
After removing the finger, release the suction pressure (t ₁₂ ).

FIG. 5 shows the structure of the pressure control section, with a side sectional view shown in FIG. 5a and a front view shown in FIG. 5b. In addition, each code is equivalent to the one already mentioned,
11 represents an O-ring, 12a, 12b, 12
c represents an upper valve body, a middle valve body, and a lower valve body, respectively.

FIG. 6 shows an overall configuration diagram of the blood pressure monitor of this embodiment.

In the figure, 4 indicates the cuff, 5 indicates the pump, and 1
0 represents the pump drive switch.

Reference numeral 13 denotes a control circuit CPU which calculates a photoelectric pulse based on the amount of light emitted by a light emitting element 14a provided on the cuff 4 and the amount of light received by a light receiving element 14b provided on the cuff 4 and receiving light that has passed through the blood vessel of the finger 15. Get the wave signal. Furthermore, the output of the pressure sensor 16 that detects the pressure of the cuff 4 is A-D (analog-digital).
Data converted from A to D by the converter 17 is also obtained.

Further, the CPU 13 operates as a pump drive switch 10.
The pump 5 is driven via the pump drive circuit 18 upon detecting that the switch is turned on.

Reference numeral 19 denotes a memory in which a program for realizing the pressure control shown in FIG. 4 is stored.

20 is a display device that displays measured blood pressure information.

By applying suction pressure to the cuff before and after blood pressure measurement, you can smoothly insert and remove your finger from the cuff.
It is possible to prevent the cuff membrane from being worn out or torn due to friction between the fingers and the cuff membrane.

<Effects> As described above, according to the present invention, there is provided a sphygmomanometer that includes a cuff into which a peripheral part is inserted, that puts the cuff under suction before or after blood pressure measurement, and adjusts the pressure of the cuff during blood pressure measurement. , a suction-side pipe body, and a discharge-side pipe body provided with a pressure reducing valve, and a pump that transfers a pressure medium from the suction-side pipe body to the discharge-side pipe body; the cuff; and the suction-side pipe body of the pump; and a first flow path connecting the discharge side pipe of the pump and the pressure medium discharge port, and the pressure medium suction port and the suction side pipe of the pump,
a second flow path connecting the discharge side pipe of the pump and the cuff; an operation button; and a valve that is moved by the operation of the operation button and opens either the first flow path or the second flow path. the body, a drive means for driving the pump in response to the press of the operation button, and a stop means for stopping the drive of the pump when the pressure in the cuff reaches a predetermined value, so that the blood pressure can be measured before blood pressure is measured. Alternatively, the cuff can be made to be under pressure later, and the cuff pressure can be increased or decreased during blood pressure measurement.It has a simple structure, can be executed with a single button operation, is inexpensive, and is convenient to handle. Get the advantage of being.

[Brief explanation of the drawing]

FIGS. 1 to 3 are diagrams explaining the pressure control section of the blood pressure monitor according to the present invention, FIG. 4 is a diagram showing cuff pressure control performed in conjunction with blood pressure measurement, and FIGS. A side sectional view and a front view of the pressure control section, and FIG. 6 are overall configuration diagrams of the blood pressure monitor. 1... Three-way valve, 2... Thrust shaft, 3... Operation button, 4... Cuff, 5... Pump, 6... Air outlet, 7... Air inlet, 8... Pressure reducing valve, 10
... Pump drive switch, 13 ... Control circuit, 1
8...Pump drive circuit, 19...Memory, A...
Suction side pipe body of the pump 5, B...the pump 5
discharge side pipe body.

Claims (1)

[Scope of Claim for Utility Model Registration] A sphygmomanometer equipped with a cuff into which a terminal area is inserted, and which applies suction pressure to the cuff before or after blood pressure measurement to adjust the pressure of the cuff during blood pressure measurement: a suction-side tube body; , and a pump that is provided with a discharge side pipe body provided with a pressure reducing valve and that transfers a pressure medium from the suction side pipe body to the discharge side pipe body; and a pump that connects the cuff and the suction side pipe body of the pump; , a first flow path that connects the discharge side pipe of the pump and the pressure medium discharge port, and a first flow path that connects the pressure medium suction port and the suction side pipe of the pump, and a discharge side pipe of the pump. and a second flow path connecting the cuff and the cuff; an operation button; and a second flow path that is moved by the operation of the operation button and that connects the cuff to the first flow path.
a valve body that opens either the flow channel or the second flow channel; a drive means that drives the pump in response to a press of the operation button; and a drive means that drives the pump when the pressure in the cuff reaches a predetermined value. A blood pressure monitor characterized by comprising: a stopping means for stopping the sphygmomanometer.