JPH01214337A - Apparatus for detecting radial artery wave - Google Patents

Abstract

PURPOSE:To enhance the detection accuracy of a pulse wave by mounting a control apparatus for relatively rotating a base part and a revolving part to a revolving drive apparatus so that the radial artery wave detected by a pulse wave sensor becomes the optimum magnitude. CONSTITUTION:An order signal is outputted to a pressure control valve 34 from a microcomputer 32 and a fluid is supplied into a housing 26 from an electromotive pump 36 to raise the pressure of said housing 26 and a pulse wave sensor 28 is pressed to the radial artery 22 and the fluid pressure at the point of time when the magnitude of a pulse wave signal SW is saturated in a pressure rising process is kept. Continuously, an order signal is outputted to a control valve 23 to draw in the cylinder rod 21 of a pneumatic cylinder 17 and a revolving part 14 is revolved with respect to a base part 12. When it is judged that the magnitude of the pulse wave signal SM is optimized, that is, saturated in the microcomputer 32, the movement of the cylinder rod 21 is stopped by the control valve 23 and an armrest 16 is positioned to hold the bending angle of a wrist. As mentioned above, maximal and minimal blood pressure values are determined on the basis of the pulse wave signal SM always having the optimum magnitude.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an improvement of a radial artery wave detection device for detecting radial artery waves generated in a radial artery of a living body.

Conventional technology The radial artery on the radial bone on the forearm finger side near the wrist of a living body is located relatively close to the surface of the living body, so this radial artery expands and contracts in synchronization with the heartbeat. A radial artery wave detection device has been provided which detects the radial artery wave generated by the radial artery by pressing a pulse wave sensor against the radial artery. In such a device,
The bending angle of the living body's wrist and the magnitude of the detected radial artery wave correspond to each other. An armrest is used to support the wrist in a certain posture bent outward at an appropriate angle, and the pulse wave sensor is pressed onto the radial artery of the wrist supported in this way, thereby detecting the radial artery wave. is now detected.

Problems to be Solved by the Invention However, in such conventional devices, the wrist of the living body is always supported in a constant posture by the armrest, so the magnitude of the radial artery wave detected by the pulse wave sensor is always Therefore, a pulse wave of the optimum size is not necessarily detected, and there are cases where sufficient accuracy of pulse wave detection cannot be obtained. It is also possible to manually change the angle of the armrest in such a device, but even in this case, it is difficult to accurately position the armrest at a position where the magnitude of the radial artery wave is optimal. However, the accuracy of pulse wave detection is not sufficient.

Means for Solving the Problems The present invention has been made against the background of the above-mentioned circumstances, and its gist is that the radial artery located on the forearm side of the living body is pressed against the radial artery, and its flexural A radial artery wave detection device for detecting radial artery waves generated in a bony artery, the device comprising:
an armrest comprising: a base portion that is brought into close contact with the back surface of the forearm; and a rotating portion that is rotatably provided at the base portion and is brought into contact with the back surface of the hand following the forearm and rotated together with the hand; , (b) provided on the armrest;
(C) a rotation drive device that relatively rotates the base and the rotation part to determine the angle between the base and the rotation part; and (C) a rotation drive device that is pressed by the radial artery and detects the radial artery wave. It includes a pulse wave sensor and a control device that causes the rotation drive device to relatively rotate the base portion and the rotation portion so that the radial artery wave detected by the 1dl pulse wave sensor has an optimal size. There is a particular thing.

In this way, the rotary drive device is controlled by the control device and brought into close contact with the back of the forearm so that the radial artery wave detected by the pulse wave sensor has an optimal magnitude. The rotating portion, which is rotated together with the base and the hand, is rotated relative to each other to determine the bending angle of the living body's wrist. Therefore, according to the present invention, the bending angle of a living person's hand is automatically determined so that the optimal size of the radial artery wave is detected, so the wrist Compared to conventional devices in which the bending angle is fixed in advance, the accuracy of pulse wave detection can be significantly improved.

The radial artery wave detection device of the present invention preferably includes a pressing means for pressing the pulse wave sensor against the radial artery, and the control device preferably detects the pulse wave sensor. The rotary drive device causes the base portion and the rotary portion to rotate relative to each other while the pressing force of the sensor is held constant.

Preferably, the control device determines in advance an optimal pressing force for the pulse wave sensor, and presses the pulse wave sensor against the radial artery with the optimal pressing force while causing the rotational drive device to press the pulse wave sensor against the radial artery. The base portion and the rotating portion are rotated relative to each other.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram illustrating the configuration of the radial artery wave detection device of this embodiment. The living body 10 has a base 1 made of a plate-like member.
An armrest 1 consisting of a rotating part 2, a rotating part 14, etc.
6 is fixed. The base 12 closely contacts the back surface of the forearm of the living body 10 to support the forearm, while the rotating portion 14
touches and supports from the wrist to the back of the hand. The base portion 12 and the rotating portion 14 are connected to each other by a pin 18.
They are connected so that they can rotate relative to each other around the center. In addition, a fixing band 2 made of cloth or the like is provided on one surface of the rotating part 140 on the contact side.
One side of the fixing band 20 is glued to the hand of the living body 10, and the fixing band 20 is wrapped around the hand of the living body 10, and a pair of fasteners (not shown) provided at both ends of the fixing band 20 are engaged with each other. It is fixed so that it does not shift from the moving part 14.

Connecting pins 13.15 of different sizes are respectively fixed at predetermined positions on the outer surface of the base 12 of the armrest 16 and the outer surface of the rotating part 14 that does not come into contact with the hand. An arm 19 provided on one end surface of the pneumatic cylinder 17 and one end of a cylinder rod 21 that protrudes from the other end surface of the pneumatic cylinder 17 and is capable of sliding back and forth within the pneumatic cylinder 17 are rotated relative to each other. Possibly connected. Air is supplied into the pneumatic cylinder 17 from an electric pump 25 via a pipe 27, and the supply and discharge of this air is controlled by a control valve 23. That is, when compressed air is supplied into the pneumatic cylinder 17 and air is discharged therefrom, the cylinder rod 21 is reciprocated within the pneumatic cylinder 17, so that the rotating portion 14 is moved relative to the base 12. The bending angle of the wrist of the living body 10 is adjusted by relatively rotating the hand of the living body 10 together with the rotating portion 14 . Therefore, in this embodiment, the pneumatic cylinder 17. Cylinder loft 21. The control valve 23 and the electric pump 25 constitute the rotary drive device of this embodiment. The dimensions of the connecting pins 13 and 15 are set so that the pneumatic cylinder 17 does not come into contact with the outer surface of the armrest 16 even when the armrest 16 is flat, that is, when the wrist is fully extended.

Directly above the radial artery 22 located on the radial bone of the wrist of the living body 10, the pulse wave detection probe 24 is attached to the bottom surface of the wrist by wrapping and tightening a support band (not shown) around the wrist. It is in contact with and fixed to the surface of the living body 10. As shown in FIG. 2, the pulse wave detection probe 24 includes a container-shaped housing 26 with an open bottom and a housing 26.
The pulse wave sensor 28 housed in the housing 2 is inserted between the inner wall of the housing 26 and the pulse wave sensor 28.
The pulse wave sensor 28 is made of an annular rubber diaphragm 30 that supports the pulse wave sensor 28 so that the inside of the pulse wave sensor 6 is made airtight and the detection surface of the pulse wave sensor 28 comes into close contact with the living body 10.

Pressure fluid whose pressure is regulated by a pressure regulating valve 34 controlled by a microcomputer 32 (described later) is supplied into the pulse wave detection probe 24 from an electric pump 36 via a pipe 31, so that the diaphragm 30 expands. The pulse wave sensor 28 is pressed against the radial artery 22 with an optimum pressing force. By pressing the pulse wave sensor 28 against the radial artery 22 in this way, the pulse wave, which is a pressure vibration wave generated as the radial artery 22 expands and contracts in synchronization with the heartbeat, is transmitted to the radial artery 22. It is detected by the wave sensor 28. Therefore, in this embodiment, the housing 26
The diaphragm 30 constitutes a pressing means.

The pulse wave sensor 28 supplies the microcomputer 32 with a pulse wave signal SM representing the detected pulse wave. The microcomputer 32 includes a CPU (not shown) and a RAM (not shown).
, ROM, I10 ink face, etc.
The PU processes the pulse wave signal SM according to a program stored in the ROM in advance while utilizing the memory function of the RAM, and determines a blood pressure value based on this pulse wave signal SM and displays it on the blood pressure display 38. Along with this, the waveform display 40
display the pulse wave. The upper peak value of the pulse wave is the systolic blood pressure value,
Since the lower peak values each correspond to the diastolic blood pressure value, the blood pressure value is determined based on the actual peak value from the correspondence relationship determined in advance. Note that the pulse wave shape displayed on the waveform display 40 as described above represents arterial pressure and is therefore utilized as various medical information. However, there is no problem even if one of the waveform display 40 and the blood pressure display 38 is not provided.

The microcomputer 32 also calculates the magnitude of the pulse wave signal SM, such as the amplitude and signal power, and determines whether the magnitude of the pulse wave signal SM is saturated, that is, the pulse wave sensor 28
It is detected whether or not the pressure is being pressed with the optimum pressing force, and when the pressure is saturated, the pressure regulating valve 34 is feedback-controlled so that the pressing force is maintained. Furthermore, the microcomputer 32 detects whether the magnitude of the pulse wave signal SM becomes saturated again in the process of changing the rotation angle of the armrest 16, and when it becomes saturated, outputs a command signal to the control valve 23. The angle formed by the armrest 16 is maintained. Therefore, in this embodiment, the microcomputer 32 functions as a control device.

The operation of this embodiment configured as above will be explained below.

First, a command signal is output from the microcomputer 32 to the pressure regulating valve 34, fluid is supplied from the electric pump 36 into the housing 26, and the pressure inside the housing 26 is increased, so that the pulse wave sensor 28 detects the radial artery 22. , and in the process of increasing the pressure, the pulse wave signal S
The fluid pressure at the time when the magnitude of M is saturated is maintained. Subsequently, a command signal is output to the control valve 23, and the cylinder rod 21 of the pneumatic cylinder 17 is retracted.
The rotating part 14 is rotated relative to the base 12, and is in a state as shown in FIG. 1, for example. In the process of such operations, the microcomputer 32 outputs the pulse wave signal SM.
When it is determined that the size of the cylinder rod 21 of the pneumatic cylinder 17 is stopped by the control valve 23, the armrest 16 is positioned in this state and the wrist The bending angle is maintained. The systolic and diastolic blood pressure values are determined based on the pulse wave signal SM, which always has an optimal magnitude.

As described above, in the radial artery wave detection device of this embodiment, the armrest 16 is automatically positioned when the magnitude of the pulse wave signal SM representing the pulse wave of the radial artery 22 becomes optimal. Since the bending angle of the wrist of 10 is maintained and a radial artery wave of an optimal size is always detected, the accuracy of pulse wave detection can be greatly improved.

Although one embodiment of the present invention has been described above based on the drawings,
The present invention can also be suitably implemented in other embodiments.

For example, in the above embodiment, first the pulse wave sensor 2
After the pressing force of 8 is adjusted to be optimal, the base 1 of the rotating portion 14 is adjusted so that the magnitude of the pulse wave signal SM is optimal.
Although the angle relative to 2 is positioned,
On the other hand, while maintaining the inside of the housing 26 of the pulse wave detection probe 24 at a relatively low predetermined pressure in advance, the angle of the armrest 16 is changed and the position is determined when the magnitude of the pulse wave signal SM is saturated. The fluid pressure within the housing 26 may be further increased to maintain the pressure at the time when the pulse wave signal SM becomes larger and becomes saturated again. Further, at this time, the pulse wave signal S is omitted to further increase the internal pressure of the housing 26 from the predetermined pressure, and the pulse wave signal S
Even if you read M, a certain effect can be obtained.

Further, in the above embodiment, the pulse wave sensor 28 is connected to the living body 1.
However, for example, the opening of the housing 26 may be closed with a diaphragm made of rubber or the like, and the pressure sensor may be placed inside the housing 26 or inside the housing 26. When attached to the outside and supplying fluid into the housing 26, the pressure vibration wave transmitted by the fluid corresponding to the radial artery wave is directly or indirectly detected by the pressure sensor, and the pressure vibration wave is responded to. Alternatively, the pulse wave signal SM may be output. Alternatively, the pulse wave detection probe 24 may be a bag made of a thin film made of flexible and relatively inelastic synthetic resin, etc., and the bottom surface of the bag may be pressed against the surface of the living body 10, and the top surface of the bag may be pressed against the surface of the living body 10. By bringing a pressure sensor into close contact with the thin film, pressure vibration waves transmitted through the thin film in response to radial artery waves may be detected.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of a radial artery wave detection device according to an embodiment of the present invention, and shows a state in which the device is attached to a living body. FIG. 2 is a sectional view showing the pulse wave detection probe of FIG. 1 in detail. 10: Living body 12: Base 14: Rotating part 16: Armrest 22: Radial artery 28: Pulse wave sensor 32: Microcomputer (control device) Applicant: Corin Electronics Co., Ltd. Figure 1 Figure 2

Claims (3)

[Claims] (1) A radial artery wave detection device for detecting radial artery waves generated in the radial artery when pressed by the radial artery located on the todigital side of the forearm of a living body, the device comprising: an armrest comprising a base that is brought into close contact with the armrest; a rotating part that is rotatably provided on the base and that is brought into contact with the back surface of the hand following the forearm and rotated together with the hand; a rotational drive device that rotates the base and the rotating portion relative to each other to determine the angle between the base and the rotating portion; and a pulse that is pressed against the radial artery and detects the radial artery wave. a wave sensor; and a control device that causes the rotary drive device to relatively rotate the base portion and the rotary portion so that the radial artery wave detected by the pulse wave sensor has an optimal magnitude. Characteristic radial artery wave detection device. (2) The radial artery wave detection device includes a pressing means for pressing the pulse wave sensor against the radial artery, and the control device maintains a constant pressing force of the pulse wave sensor. The radial artery wave detection device according to claim 1, wherein the rotation drive device causes the base portion and the rotation portion to rotate relative to each other in the state. (3) The control device determines in advance an optimal pressing force for the pulse wave sensor, and causes the rotation drive device to rotate with the base while pressing the pulse wave sensor against the radial artery using the optimal pressing force. The radial artery wave detection device according to claim 2, wherein the radial artery wave detection device rotates relative to the moving part.