JPH05176900A - Hemomanometer - Google Patents

Abstract

PURPOSE:To simply obtain an accurate blood pressure value without complicated operation by taking the weighted average of the respective outputs of a plurality of blood pressure measuring means using the coefficients corresponding to the attaching positions of the blood pressure measuring means. CONSTITUTION:The outputs of two left and right blood pressure measuring cuffs 1, 2 are sent to a weighted average circuit 4 through a preamplifier circuit 3 and the weighted average thereof is taken using a predetermined coefficient. This coefficient is controlled by a control unit 5. The average value obtained as the result of the weighted average is sent to a memory device 7 to be stored therein. A cuff pressure generating circuit 6 is controlled by the control unit 5 to apply pressure to the cuffs 1, 2. For example, a posture evaluation device 8 is composed of a television camera and catches the posture of an examinee to sent the image thereof to the memory device 7 to store the same therein. That is, for example, when the ratio of the distances of the cuffs 1, 2 wound around the left and right upper arms from the heart is 2:3, the output from the left cuff 1 is multiplied by a coefficient 3 for the sake of weighted average and the output from the right cuff 2 is multiplied by a coefficient 2 to perform weighted average.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sphygmomanometer for measuring the blood pressure of humans.

[0002]

2. Description of the Related Art Usually, blood pressure is measured by wrapping a cuff around the upper arm or the index finger and detecting the protocol sound. For example, a cuff is wrapped around the upper arm of the subject's left arm. In this case, if the subject is seated, the height of the heart and the height of the cuff are the same, and the measured value accurately reflects the blood pressure of the heart. However, when the subject is lying down, the blood pressure measurement value is ± 10 mmHg.
Some instability occurs. When the height position of the heart and the height position of the wrapped cuff are different as described above, an accurate blood pressure value cannot be obtained.

Therefore, conventionally, for example, a liquid is enclosed in a tube, the tube is connected to a measurement point to which a cuff is attached, and the pressure of the liquid at the measurement point is measured, whereby the heart and the measurement point are measured. The error based on the difference in height between the and is corrected.

[0004]

However, the conventional work of detecting the height difference between the heart and the measuring point and correcting the error by this is actually a complicated work, and moreover, it is a complicated work. It cannot be performed when the examiner is sleeping. Therefore, conventionally, it has been difficult to easily and accurately measure blood pressure.

In view of the above, it is an object of the present invention to provide a sphygmomanometer improved so that an accurate blood pressure value can be easily obtained without the need for complicated operation.

[0006]

To achieve the above object, in the sphygmomanometer according to the present invention, a plurality of blood pressure measuring means (cuffs) are attached to a plurality of locations on the human body. Then, a coefficient corresponding to the position of each attachment point from the heart is obtained, and the output from each blood pressure measuring means is weighted averaged by this coefficient. Then, the value obtained by this weighted average represents the blood pressure value at the heart position, and this relationship does not change no matter how the posture of the subject changes. Therefore, it is possible to easily obtain an accurate blood pressure value without requiring a complicated operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. As shown in FIG. 1, the outputs of two blood pressure measurement cuffs 1 and 2 are sent to a weighted average circuit 4 via a preamplification circuit 3 and their Each output is weighted and averaged by a predetermined coefficient. The coefficient is controlled by the controller 5. The average value obtained as a result of this weighted average is sent to and stored in the storage device 7. The cuff pressure generation circuit 6 is controlled by the control device 5 to apply pressure to the cuffs 1 and 2. The posture evaluation device 8 is composed of, for example, a television camera, captures the posture of the subject, and sends the image to the storage device 7 for storage.

In this embodiment, the blood pressure measuring cuffs 1 and 2 are wrapped around the left and right upper arm portions of the subject 21, as shown in FIG. In this case, it is assumed that the distances from the hearts 22 of the cuffs 1 and 2 are 2: 3 and the coefficient for the weighted average is determined. The output from left cuff 1 is then multiplied by a factor of 3, and the output from right cuff 2 is a factor of 2.
Are multiplied and a weighted average is performed.

The control device 5 and the weighted average circuit 4 are set so that such weighted average calculation is performed, and then the cuff pressure generation circuit 6 is operated by the control of the control device 5 at predetermined time intervals. Pressure is applied to the cuffs 1 and 2, and an output indicating a blood pressure value is sent from the cuffs 1 and 2 to the weighted average circuit 4 via the preamplifier circuit 3 each time.

In this case, assuming that the subject 21 is lying on a bed or the like, no matter how the subject 21 turns over, the output from the weighted average circuit 4 is that of the cuffs 1 and 2. Since each output is a weighted average corresponding to the position of each measurement point with respect to the position of the heart 22, it accurately represents the blood pressure value at the position of the heart 22. Therefore, the configuration of this embodiment is suitable for automatically measuring the blood pressure of a sleeping patient lying in a hospital bed at regular intervals.

Thus, the accurate blood pressure measurement value is stored in the storage device 7.
The output of the posture evaluation device 8 is also stored in the storage device 7 at the same time. Therefore, when the blood pressure measurement value is read out from the storage device 7 later, it is possible to know the relationship with the posture of the subject 21 when each measurement value is obtained, and even if the abnormal blood pressure measurement value is stored. However, it is also possible to perform data analysis to make a proper evaluation of the value. Also,
An abnormal value can be corrected by the posture at that time. Therefore, it is possible to monitor the fluctuation of the output obtained from the weighted average circuit 4 in the control device 5 and store the output from the posture evaluation device 8 in the storage device 7 only when the fluctuation is large. The storage capacity of the storage device 7 can be saved.

Although blood pressure measurement cuffs 1 and 2 are attached to the upper arm in the above embodiment to obtain blood pressure measurement data, other measurement points include the superficial artery of the temple, the wrist, Fingers can also be used.

The posture evaluation device 8 is used as the subject 2
It is only necessary to be able to capture the positional relationship between the heart 22 and the measurement point to which the cuff is attached among the postures of the blood pressure measurement of No. 1 described above. By attaching a transmitter (or reflector) to the place where the cuffs 1 and 2 are attached, such as the limbs, and detecting a transmission signal (or a reflection signal from the reflector) from the transmitter with another sensor, A configuration in which the posture of the subject 21 is determined by capturing the positions such as

Further, instead of weighting and averaging the outputs of the cuffs 1 and 2 online, the outputs of the cuffs 1 and 2 are stored as they are in the storage device 7 together with the output of the posture evaluation device 8, and these are output later. Off-line, in which each output is read, a coefficient to be multiplied by the output of each cuff 1 and 2 is calculated by the posture evaluation output at each measurement for each measurement, and this is given to the weighted average circuit 4 to perform the weighted average. The configuration of is also possible.

[0015]

As described above, according to the sphygmomanometer of the present invention, an accurate blood pressure value that does not depend on changes in the posture of the subject can be easily obtained without the need for complicated operations. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a schematic view showing a cuff winding position in the embodiment.

[Explanation of symbols]

 1, 2 Blood pressure measurement cuff 3 Preamplification circuit 4 Weighted averaging circuit 5 Control device 6 Cuff pressure generation circuit 7 Storage device 8 Posture evaluation device 21 Subject 22 Heart

Claims (1)

[Claims] 1. A blood pressure system comprising: a plurality of blood pressure measuring means; and a weighted averaging means for weighting and averaging each output from the blood pressure measuring means with a coefficient according to the mounting position of the blood pressure measuring means. Total.