JPH0333323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blood pressure monitor capable of displaying whether or not the cuff wrapping operation is appropriate during indirect blood pressure measurement.

When measuring indirect blood pressure, it is necessary to wrap the cuff with appropriate strength in order to obtain accurate measurements.

That is, if the cuff is wrapped very loosely and then inflated by blowing air into the cuff, the cuff will fit tightly against the arm with a width that is much narrower than that width, thus reducing the effective width of the cuff. If the effective width of the cuff is less than a predetermined value, accurate measurement results cannot be obtained; therefore, by wrapping the cuff loosely, inaccurate blood pressure values will be obtained.

In addition, if the cuff is tightened too strongly, the effective width of the cuff can be increased, but it goes without saying that an accurate measurement value cannot be obtained.

As mentioned above, it is extremely important to wrap the cuff around the arm with an appropriate strength so as to effectively obtain the effective width of the cuff.However, in the past, it has been difficult to judge whether or not the setting of the cuff wrapping strength is appropriate. There are no standards,
Since each operator wrapped the cuff based on their own personal judgment, blood pressure measurements were not always accurate.

Furthermore, when trying to judge the appropriate cuff wrapping strength by the cuff wrapping length, for example, when measuring the blood pressure of multiple people with one blood pressure monitor, each person's arm thickness is different, so the wrapping length is different. cannot be determined constant, and this method is inappropriate.

In view of the drawbacks of the prior art as described above, the present invention
To provide a blood pressure monitor which judges and displays the appropriateness of the winding strength of a cuff.

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, 1 is a pump, 2 is a valve that adjusts the air supply of pump 1, 3 is a flow sensor, and 4
5 is a pressure sensor, 5 is a round sensor, 6 is a cuff, 7 is an electrical counting circuit, 8 is a blood pressure monitor control circuit, and 9 is a display.

Next, the effect will be explained.

First, the cuff 6 is wrapped around the arm and fixed with a known fastener, and the cuff 6 is wrapped around the arm.
By fixing the cuff 6, the round sensor 5 detects the wrapped length of the cuff 6. The round sensor 5 is made up of, for example, a belt-shaped resistor and a belt-shaped contact parallel to the resistor in the thickness direction, and is usually separated from the belt-shaped resistor, but it is possible to apply pressure partially at any location in the longitudinal direction. A known sensor is used as a sensor, where the contact and the resistor come into contact with each other and conduction occurs, creating a resistance value depending on the position of the contact. and attach it. Therefore, when the cuff 6 is wrapped around the arm and fixed with a fastener, the round sensor 5 is also pressurized by the fastener, and conduction occurs at that part, so there is resistance at a position corresponding to the length of the cuff 6 wrapped around it. The cuff 6 is electrically conductive and generates resistance, so by measuring and converting the value, the length of the cuff 6 wrapped can be detected.

The cuff 6 is wrapped around the arm, the length of the wrapping is detected, and the round sensor 5 applies that value as a resistance value to the counting circuit 7, and then the pump 1 supplies air to the cuff 6 via the valve 2. The flow sensor 3 measures the flow rate of the inflated air and transmits it to the counting circuit 7. On the other hand, the pressure sensor 4 detects the pressure in the cuff 6 and transmits the value to the tension counting circuit 7.

The counting circuit 7 integrates the value of the insufflation flow rate given by the flow sensor 3 and compares this total insufflation amount with the pressure inside the cuff 6 given by the pressure sensor 4.

By the way, when the cuff 6 is wrapped around the arm with appropriate strength and fixed, the total flow rate required for the pressure inside the cuff 6 to reach a certain pressure depending on the thickness of the arm is constant; In other words, the pressure reaches a certain value by supplying a certain volume of air. Therefore, if the thickness of the arm is detected by the wrapping length, it can be determined whether the wrapping strength is appropriate or not by comparing the air supply volume and pressure with that value.

That is, the counting circuit 7 first receives the round sensor 5.
is given the value of the wrapping length of the cuff 6 around the arm, and based on this, the values of the flow sensor 3 and the pressure sensor 4 are compared, the suitability of the wrapping strength is determined, and the result is indicate.

The following means are performed for the above display.

If the wrapping strength is inappropriate, a message indicating that the wrapping strength is inappropriate is displayed on the display 9 and/or a buzzer, a lamp, etc. are activated. Or opening valve 2, stopping pump 1,
Or the blood pressure measurement operation is interrupted by other means. In this way, the wrapping of the cuff 6 can be determined by displaying information on the display 9 and/or other means, and/or interrupting the blood pressure measurement operation, or by other appropriate means. Make an indication that the strength is inappropriate.

If the winding strength is appropriate, a message indicating that the winding strength is appropriate is displayed on the display 9. This display can be done by lighting up a blue lamp, etc.
Other means may also be used. Alternatively, the display 9 may display no information at all, and the blood pressure measurement operation may not be interrupted, indicating that it is appropriate.

When the pressure sensor 4 reaches a certain value, the control circuit 8 opens the valve 2 to gradually lower the pressure in the cuff 6, and in the process, performs a control circuit using a known method, such as the Rybarotsch-Korotkov method or the vibration method. The maximum and diastolic blood pressures obtained are detected and the values are displayed on the display 9.

In the above embodiment, since the round sensor 5 detects the length of the cuff 6 wrapped around the arm, it may be configured as shown in FIG. 2, for example.

That is, in FIG. 2, the arm 1 having the bone 10a
When the cuff 6 is wrapped around the cuff 6 and the cuff 6 is partially pressurized with a tightening fitting at the arrow A section, the contact 5 forming the round sensor 5 is attached to the edge of the cuff 6.
a, a low antibody 5b is provided, and each lead wire 11
Since it is connected to the counting circuit 7 at a and 11b,
The low antibody 5b comes into contact with this contactor 5a at the arrow A portion, and electricity is applied. Since the position of arrow A differs depending on the thickness of the arm 10 or the tightness of the wrapping, the resistance value generated in the low antibody 5b changes accordingly.
The length of the cuff 6 at the portion wrapped around the cuff 6 is detected.

Furthermore, in the above embodiment, the value of the volume of air delivered into the cuff 6 is obtained by the counting circuit 7 integrating the detection value of the flow sensor 3, but as a means for detecting the volume of air delivered, Alternatively, it may be determined based on the rotational speed of the pump 1 and the discharge amount per unit rotational speed, and the object of the present invention can be achieved by any other means that can detect the air volume. .

Furthermore, as for the means for supplying air to the cuff 6, in addition to the means using the pump 1, high pressure air may be introduced from an air tank, or other means may be used. When supplying air from an air tank in this way, it is necessary to measure the pressure inside the air tank in advance before supplying air, and estimate the volume of the supplied air based on the value of the reduced pressure after the start of supply. can also be considered.

Furthermore, the pressure sensor 4 as a means for detecting the pressure within the cuff 6 may be of a type that converts a change in pressure into a change in resistance value, for example, or may be of a type that detects a value of a change in pressure. This may be done by any means possible.

According to the present invention, in the indirect blood pressure measurement method, the adequacy of the cuff wrapping strength, which has an extremely large effect on the measured value, is reliably detected and displayed, so regardless of the measurement technique, variations The effect is that accurate blood pressure measurement can be performed without any blemishes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a specific example of a round sensor 5. In FIG. 1... pump, 2... valve, 3... flow sensor, 4... pressure sensor, 5... round sensor, 6... cuff, 7... counting circuit,
8...Control circuit, 9...Display, 10...
arm.

Claims (1)

[Scope of Claims] 1. An indirect blood pressure measuring device that measures blood pressure during the process of wrapping a cuff around the arm, supplying air to increase pressure, and then reducing the pressure, comprising means for detecting the volume of air supplied to the cuff 6; means for detecting the pressure within the cuff 6; means for detecting the wrapping length of the cuff 6; and means for detecting the air volume, pressure, and wrapping length of the cuff 6 when the wrapping strength of the cuff 6 is appropriate. a counting circuit 7 configured to store values of relative relationships between values; said counting circuit 7 calculates the volume, pressure, and
A blood pressure measuring device having a cuff wrapping suitability display device which compares a value of the relative relationship between the values obtained by detecting the wrapping length with a stored value and displays whether or not the wrapping strength is appropriate.