JPS6040037A - Hemomanometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a blood pressure monitor, and particularly to an electronic blood pressure monitor in which cuff pressurization operations and blood pressure measurement operations are electronically controlled.

[Background Art] Generally, before shipping, electronic blood pressure monitors adjust the output when no pressure is applied and when the pressure is applied to a constant value so that accurate blood pressure can be displayed. It is difficult to make it zero.

In other words, even if adjustments are made at the time of shipment, changes may occur due to input voltage or external factors, and once the cuff is used, a certain amount of pressure will inevitably remain in the cuff band, making it difficult to apply pressure the next time it is used. However, the pressure display does not become zero, and when the display is a denotal type, this is clearly indicated, which makes the user feel even more distrustful, and even though there is residual pressure. If this is displayed as zero, the offset amount will be too large and blood pressure measurement will be inaccurate. For this purpose, when the power switch is turned on, the release valve is operated to release the pressure remaining in the cuff band, and the atmospheric pressure at the time of release is measured, the display is set to zero, and the above atmospheric pressure and pressurization are measured. It has been proposed to display the blood pressure as the difference between the measured pressure value and the measured value at the same time. In this case, the offset error is eliminated and the display when no pressure is applied can be accurately set to zero, but the pressure within the cuff band does not immediately drop to atmospheric pressure even when the release valve is opened. Another problem is that it takes a long time to start measurement.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to ensure that the display when no pressure is applied is zero, and to accurately measure blood pressure. Needless to say, it is an object of the present invention to provide a blood pressure monitor that can start measuring immediately when the power switch is turned on.

[Disclosure of the Invention] The present invention provides a pressure sensor that detects the pressure in a cuff band pressurized by air pumped from a pressure pump, and a release valve that communicates the pressure sensing portion of the pressure sensor with the atmosphere. The feature is that the release valve is opened in conjunction with turning off the power switch of the pressure detector or other electrical equipment to release the pressure sensing part of the pressure detector to the atmosphere. , so that it is already open to atmospheric pressure when the power switch is turned on. Various types of release valves can be considered, such as a power switch operation knob that can be used as the valve member of the release valve, or a solenoid valve that closes when the power switch is turned on and opens when the power switch is turned off. .

The present invention will be explained below based on illustrated embodiments.

First, the overall configuration will be explained using the block circuit diagram shown in FIG. 1. A cuff band 1 that is wrapped around the arm is connected to a pressure sensor 3 and a pressure pump 4 inside the blood pressure monitor body through a rubber tube 2 for ventilation. A release valve 5 and an exhaust valve 6 are connected to this air path. The exhaust valve 6 consists of a constant-speed exhaust valve 6A that opens when blood pressure is measured, and a rapid exhaust valve 6B that rapidly evacuates air after measuring the diastolic blood pressure value.

The electrical output of the pressure sensor 3 is converted into a digital value by an A/D converter 7 and inputted to a current value storage circuit 8, and is also inputted to an atmospheric pressure storage circuit 10 via a gate 9. The outputs of both memory circuits are compared by a comparator II, and the differential pressure is sent to a digital display 12. Reference numeral 13 denotes a microphone attached to the cuff band 1, the output of which enters a sound detection circuit 14 where a sound (Korotkoff sound) is detected, and this output is sent to an operation control circuit 15. And 16 is a power switch.

Next, briefly explaining the operation, the measurement operation is started by wrapping the cuff band 1 around the arm and activating the pressurizing pump 4. The atmospheric pressure memory circuit 10 is activated when the power switch 16 is turned on. The output of the pressure sensor 3 on the 7th shift is stored as atmospheric pressure, and the zero display is performed by offsetting this atmospheric pressure. In addition, the pressurizing pump 4 first pumps the cuff band 1 until the pressure reaches a higher value than the expected systolic blood pressure value.
Pressurize. If this expected value is too low, pressurize further. Next, the constant speed exhaust valve 6A is opened and the pressure is gradually lowered while monitoring the Flotcof sound, and the differential pressure between the output of the pressure detector 3 and the atmospheric pressure at the time when the Korotkoff sound appears is held as the systolic blood pressure value. While displaying this on the display 12, the pressure is further lowered, and the differential pressure between the output of the pressure detector 3 and the atmospheric pressure at the time when the Korotkoff sound is no longer heard is displayed as the diastolic blood pressure value on the display 12. After that, exhaust is rapidly performed through the rapid exhaust valve 6B.

The measurement operation is performed in this manner, and the release valve 5 is opened by turning off the power switch 16. An example is shown in Figure 2 and Figure 3. This is the operating knob 2 that is operated by sliding the power switch 16.
If an opening for an air passage from the cuff band 1 to the pressure sensor 3 is provided on the side of the cuff 0, and a contact member such as rubber is attached to the edge of this opening, and the operation knob 20 is set to the OFF position, the second When the opening is opened as shown in the figure and turned to the on position, the operating knob 20 contacts the contact member and closes the opening as shown in FIG. The knob 20 also serves as a valve member of the release valve 5.

FIGS. 4 and 5 show an example in which the release valve 5 is constituted by a solenoid valve, and when the power switch 16 is turned off, the fill 21 of the release valve 5 is separated from the power supply 25, and the valve member 22 is attached to the tip. When the irritated plunger 23 is restored and opened by the return spring 24 and the power switch 16 is turned on, the fill 2
1 is energized, the plunger 23 is driven, and the valve member 2
2 is lowered to close.

In any of the release valves 5, although the release valve 5 is closed when the power switch 16 is turned on for blood pressure measurement, the release valve 5 remains open until the power switch 16 is turned on. The inside of the cuff band 1 and the pressure sensing part of the pressure sensor 3 are open to the atmosphere through the release valve 5, and accurate and reliable blood pressure measurement can be started immediately after the power switch 16 is turned on. It is something. It is also possible to use the aforementioned quick exhaust valve 6B as the release valve 5 to open the inside of the pressure sensor 3 and cuff band 1 to the atmosphere, but the release valve 5 should be placed as close to the pressure sensor 3 as possible. Therefore, it is preferable to install an independent release valve 5.

[Effects of the Invention] As described above, in the present invention, the pressure when no pressure is applied can be made equal to the atmospheric pressure through the open valve, so accurate measurement can be made, and the pressure display when no pressure is applied is set to zero. Moreover, since the release valve is opened by turning off the power switch, when the power switch is turned on during use, the release valve is open and the internal pressure is reliably at atmospheric pressure. Blood pressure measurement can be started immediately by turning on the power switch.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of one embodiment of the present invention, FIGS. 2 and 3 are sectional views of the same, and FIGS. 4 and 5 are sectional views of other embodiments, where 1 is a cuff band. , 3 is a pressure detector, 4 is a pressurizing pump, 5 is a release valve, 16 is a power switch, and 20 is an operating knob. Agent Patent Attorney Ishi 1) Choshichi

Claims (3)

[Claims] (1) A pressure sensor that detects the pressure inside the cuff band pressurized by air fed from a pressure pump, and a release valve that communicates the pressure detection part of this pressure sensor with the atmosphere. The blood pressure monitor is characterized in that the release valve opens in conjunction with turning off the power switch of the pressure detector or other electrical equipment to open the pressure sensing part of the pressure detector to the atmosphere. blood pressure monitor. (2) The blood pressure monitor according to claim 1, wherein the operating knob of the power switch is a valve member of an open valve. (3) The blood pressure monitor according to claim 1, wherein the release valve is a solenoid valve that is opened by turning off a power switch.