JPH01265941A - Wrist blood pressure measuring instrument - Google Patents

Abstract

PURPOSE:To make precise measurement of blood pressure by constricting the ulnar artery and radial artery of a wrist by a cuff into the blood checked condition, and by processing only signals on the radial artery side in the decompression process. CONSTITUTION:A pressurizing pump 25 sends air into blood checking tubular sacks 11, 12 of a cuff 1 fitted on a wrist so as to constrict the radial artery 32 and ulnar artery 34 to bring about a blood checked condition. A valve V1 installed on a piping 14 for the blood checking sack 12 is closed, and air exhaustion by an exhaust valve 26 is made gradually to decompress the blood checking sack 11. The pulsation of the radial artery 32 senses at this time is caught by a pressure sensor 22, and the value of blood pressure is determined by a calculating device 23, and the result is displayed on a display 24. Finally the valve V1 and exhaust valve V2 are opened to bleed air from the blood checking tubes 11, 12.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides a blood pressure measuring device that measures blood pressure at the wrist;
In particular, it relates to a blood pressure measuring device based on the oscillometric method.

[Prior Art 1] Blood pressure is generally measured in the brachial artery, but in recent years, it has been proposed to measure blood pressure in the wrist. In this case, if a configuration similar to that used when measuring blood pressure in the upper arm is used, the configuration shown in FIG. 9 will be obtained. The device shown in FIG. 9 measures blood pressure by the oscillometric method, and includes a cuff 1 that is attached to the wrist and compresses the radial artery 32 and ulnar artery 34 that pass through the hand d to the point of ischemia. 1 and a pressure sensor 2.
2, an arithmetic device 23 that calculates the blood pressure value from the output value of the pressure sensor 22, and a display device 24 that displays the blood pressure value. The radial artery 32 and the ulnar artery 34 are compressed with the cuff 1 to a state of ischemia, and during the subsequent decompression process of the cuff 1, the pressure pulse waves of the radial artery 32 and the ulnar artery 34 are detected by the pressure sensor 22, and the pressure pulse waves are detected by the pressure sensor 22. The arithmetic device 23 processes this together with the simultaneously detected internal pressure of the cuff 1 to obtain a blood pressure value, which is displayed on the display device 24. By the way, the compression pressure on both arteries 32 and 34 is not directly applied by the cuff 1, but is applied by increasing the internal pressure of the entire hand, including the radial bone 31, ulna 33, and their underlying tissues, due to the compression from the cuff 1. However, at this time, the compression pressures applied to both arteries 32 and 34 are not necessarily the same. In addition, regarding transmitting the 5.11 pulse 32.34 pulse to cuff 1, the diameter of each artery, blood flow rate, and cuff 1
Depends on distance. [Problem to be Solved by the Invention] For this reason, the pulsation of the radial artery 32 (shown in FIG. 10(a)) and the pulsation of the ulnar artery 34 (shown in t510 diagram (b)) are different. The intra-cuff pressure pulse wave shown in FIG. 10(C) that is captured by the pressure sensor 22, that is, the composite wave of both arteries 32 and 34, is unstable, making it difficult to accurately measure blood pressure. The problem is that it cannot be done. The present invention has been made in view of the above points, and its purpose is to provide a wrist blood pressure measuring device that can accurately measure blood pressure at the wrist.

[Means to solve problem N]

However, the present invention prevents blood flow from the radial artery and ulnar artery in the wrist! ! ! ! It is characterized in that it includes a cuff that compresses the main body, and a signal processing section that processes only signals from the radial artery side during the decompression process of the cuff to obtain a blood pressure value. [Effect 1] According to the present invention, by compressing both the radial artery and the ulnar artery, the pressure inside the wrist does not cause a pressure imbalance, and the pulsation is not an unstable composite wave, but a radial artery Blood pressure is measured by capturing only the objects. [Example 1] Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
The figure shows an embodiment in which the cuff 1 has two independent ischemic bags 11, 12, and when worn on the wrist, one ischemic bag 11 is attached to the radial bone 31 (lll. The other ischemic bag 12 compresses the ulnar artery 34 on the side of the ulna 33. Both ischemic bags 11.12 of the cuff 1 are connected to a pressurizing pump by independent piping 13.14. 25, the exhaust valve 2, and the gradual exhaust valve 26 are connected at t' knee.In addition, the piping 13 to the ischemic bag 11 is connected to the pressure sensor 22, whereas the piping 14 to the ischemic bag 12 is connected to the pressure sensor 22. is provided with a valve vl. Blood pressure measurement in this device is performed in the following procedure. That is, as shown in Figs. 2 and 3, the exhaust valve
Close the valve ■, and open the pressure pump 2.
5, air is sent into both ischemic bags 11.12 of the cuff 1 attached to the wrist, and both ischemic bags 11.12 are activated.
The expansion increases the internal pressure of the manual percussion and compresses the radial artery 32 and ulnar artery 34. This pressurization is carried out until both arteries 32 and 34 become bloodless due to the compression, and no pulsation (pulse wave) is detected by the pressure sensor 22. Next, the valve ■ provided in the distribution ff14 for the ischemic bag 12
, and then the air is gradually evacuated by the exhaust valve 26 to reduce the pressure in the ischemic bag 11. The pulsation of the radial artery 32 detected at this time is captured by the pressure sensor 22, and the arithmetic unit 23, the blood pressure value is derived, and the display device 2
Display on 4. Finally, listen to valve ■1 and exhaust valve ■2, and check the ischemic bag 11.
．． Let out the air in step 12. In other words, the blood pressure value is measured only by the pulsation of the radial artery 32, which is closer to the surface of the wrist than the ulnar artery 34 and whose detectable pulsation is larger than that of the ulnar artery 34.
At this time, when compressing only the radial artery 32 with the ischemic bag 11, as shown in Figure @11, the tissue within the wrist moves as indicated by the white arrow, and the pressure near the radial artery 32 does not increase. The radial artery 32 and the ulnar artery 34 branch from the brachial artery, and even if only the radial artery 32 is blocked,
Since blood flows to the ulnar artery 34 side, the ulnar artery 34 is also kept in an ischemic state by the ischemic bag 12 during blood pressure measurement.This makes it possible to reliably compress the radial artery 32 and to prevent the ulnar artery 34 from flowing. This prevents heartbeats from entering as noise. In addition, here, the pressure pump 25, valve ■1, and exhaust valve ■
2 shows a device that operates based on instructions from the arithmetic device 23, but it is of course possible to fabricate these manually. FIG. 4 shows another embodiment, which is the same as the above embodiment in that the cuff 1 is provided with a pair of ischemic bags 11.
12 is connected only by the piping 13 led out from the ischemic bag 11, and the ischemic bag 12 is connected to the ischemic bag 11 through the communication portion 15.
It is connected by. However, by filling the communication portion 15 here with a filter or making it thinner so as to increase the air resistance, the rise and fall of the internal pressure of the ischemic bag 12 is greater than that of the ischemic bag 11, as shown in FIG. Also, it should always be done slowly. In addition, in this case, as shown in Figure WIJ5, the 70-
Blood pressure is measured accordingly, and at this time, the pulsation of the ulnar artery 34 is transmitted to the ischemic bag 12, but since this is blocked by the communication section 15 with high air resistance, it is not transmitted to the ischemic bag 11 side. , blood pressure can be measured only by the pulsation of the radial artery 32. The ischemic bag 12 can be replaced by a hemostasis protrusion 18 provided on the cuff 1, as shown in Figure pIS7. In addition, when providing the cuff 1 with one-elbow blood ischemic bags 11 and 12, or when providing the blood ischemic bag 11 and the blood ischemic protrusion 18, fj
As shown in the IJ8 diagram, between the two? If 1l119 is provided, multiple arteries will pass between the radial artery 32 and the ulnar artery 34 and near the wrist surface! 35 fits into the Wt19, positioning of the cuff 1 becomes easy and the internal wrist pressure can be increased without being hindered by the Pa35.

【Effect of the invention】

As described above, in the present invention, by compressing the radial artery and ulnar artery in the wrist to a state of ischemia using the cuff, reliable compression and ischemia of the radial artery can be performed6. Since the blood pressure value is determined by processing only the signal from the radial artery side, rather than the composite wave, accurate blood pressure measurement can be performed.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a 70-chart showing the operation of the same as above, Fig. 3 is an explanatory diagram showing pressure changes during measurement of the same as above, and Fig. 4 is an embodiment of a pond. 5 is a flowchart showing the same operation as above, FIG. 6 is an explanatory diagram showing pressure changes during measurement of same as above, FIG. 7 is a sectional view of still another embodiment, and FIG. 8 is another A cutaway perspective view of the embodiment,
Fig. 9 is a block diagram of the conventional example, PI%10 is a time chart of the pulsation of the radial artery and ulnar artery and the cuff pressure pulse wave which is a composite wave of both, and Fig. 11 is a cross-sectional view of the other side. 1 is a cuff, 11.12 is an ischemic bag, and 22
is a pressure sensor, 23 is a calculation device, 32 is a radial artery, 34
indicates the ulnar artery. Agent Patent Attorney Ishi 1) Ai 7th 52 Figure 7 Figure 2 Figure 3

Claims (1)

[Claims] (1) It is equipped with a cuff that compresses the radial artery and ulnar artery in the wrist to a state of ischemia, and a signal processing unit that processes only the signal on the radial artery side during the decompression process of this cuff to calculate the blood pressure value. Features of wrist blood pressure measuring device.