JPH046730Y2 - - Google Patents

Description

[Detailed explanation of the idea]

TECHNICAL FIELD The present invention relates to an improvement of a compression device for blood pressure measurement that compresses a part of a living body with a predetermined pressure when measuring blood pressure. Prior art By compressing a part of a living body and detecting the compression pressure, the systolic blood pressure value, diastolic blood pressure value, or Automatic blood pressure measurement devices that measure trends in blood pressure values have been known. In such an automatic blood pressure measuring device, since it is necessary to change the pressure at a predetermined rate or maintain a substantially constant pressure, blood pressure measurement is performed by compressing a part of the living body at a predetermined pressure. Usually equipped with a compression device. Such a compression device generally includes a cuff that is wrapped around a part of a living body, and pressure control means that supplies a predetermined fluid to the cuff and controls the pressure of the cuff. . Problems to be solved by the invention However, in order to accurately control the compression pressure by the cuff, such a compression device for measuring blood pressure has a problem in that the fluid inside the cuff leaks from a part other than the pressure control means. It is normal that the structure is such that there is no such thing. Therefore, if fluid is supplied into the cuff and the pressure in the cuff is high and the pressure control means fails and the fluid in the cuff cannot be discharged from the pressure control means, the compression by the cuff will continue. Therefore, in cases where the cuff cannot be freely removed by the person being measured, such as when the cuff is automatically wrapped around a part of the living body using a cylinder, etc., There was a risk of causing unnecessary pain. Means for Solving the Problems The present invention was made to solve the above problems, and its gist is a cuff that is wrapped around a part of a living body, and a predetermined shape attached to the cuff. A pressure control means that supplies fluid and controls the pressure of the cuff, compresses the part of the living body at a predetermined pressure when measuring blood pressure, and automatically measures the blood pressure value in the process of changing the compression pressure. death. The automatic blood pressure measuring device is of a type that rapidly evacuates the cuff when the measurement is completed, and the pressure control means controls the pressure of the cuff by the cuff or a passage communicating with the cuff on the cuff side of the pressure control means. The cuff is provided with pores that allow the fluid inside the cuff to be constantly discharged to the outside without affecting the cuff. Function and Effects of the Invention In such an automatic blood pressure measuring device, the fluid in the cuff is gradually discharged from the pores provided in the passage communicating with the cuff on the cuff side of the cuff or the pressure control means. Even if the pressure control means malfunctions when fluid is supplied into the cuff and the pressure in the cuff is high, and the fluid in the cuff cannot be discharged from the pressure control means, the pressure in the cuff will gradually drop. do. Therefore, the pressure applied by the cuff is always released after a predetermined period of time, and there is no need to inflict unnecessary pain on the subject due to a failure of the pressure control means. On the other hand, if such pores are provided, the fluid inside the cuff will flow out even when blood pressure is being measured, so there is a risk that the pressure in the cuff will be lower than the predetermined pressure and the accuracy of blood pressure measurement will be reduced. The above-mentioned pores gradually discharge the fluid inside the cuff to the outside without affecting the pressure control of the cuff by the pressure control means, and the accuracy of measuring the blood pressure value is not impaired.
In other words, if the pressure control means is configured to detect the cuff pressure and feedback control the pressure, even if the flow rate of the fluid flowing out from the pores is relatively large, the cuff pressure control and It has almost no effect on the measurement accuracy of blood pressure values,
Further, even if the pressure control means is configured to naturally drain the fluid in the cuff and gradually reduce the compression pressure by the cuff during blood pressure measurement, for example, in the case of a cuff wrapped around the upper arm of an adult, As is clear from the examples described below, the cuff pressure can be reduced from 300 mmHg to 0 due to fluid flowing out only from the pores.
If the flow rate is such that it takes about 10 minutes to reach mmHg, the cuff pressure drop rate when measuring blood pressure (usually set to about 3 mmHg/sec.)
The impact on this can be almost ignored. Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In FIG. 1, a cuff 10 is wound around a part of a living body, and air is supplied through a conduit 12. The pipe line 12 is connected to a pipe line 16 via a connector 14, and the pipe line 16 includes an electric pump 20 that pumps air according to drive power supplied from a pump drive device 18, and an aperture 2.
A solenoid valve 24 provided with a solenoid valve 2 and a solenoid valve 26 are connected. The pump driving device 18 and the solenoid valves 24 and 26 are each driven in accordance with a driving signal supplied from a control device of the blood pressure measuring device (not shown). By operating the electric pump 20, the pressure within the cuff 10 (hereinafter referred to as cuff pressure) is increased to a predetermined pressure higher than the systolic blood pressure value of the subject. In addition, the solenoid valve 24 gradually lowers the cuff pressure by naturally exhausting the air inside the cuff 10 through the throttle 22 during blood pressure measurement.
After blood pressure measurement, the solenoid valve 26 naturally exhausts the air inside the cuff 10 to rapidly lower the cuff pressure.
These pump drive devices 18, solenoid valves 24 and 2
A pressure control means 28 includes the pressure control device 6 and the above-mentioned control device. The connector 14 is comprised of a pair of male plug 30 and female plug 32, as shown in detail in FIG. Male plug 30
As shown in FIGS. 3 and 4, the nipple 34 is airtightly fixed to the end of the conduit 16, and the rotary operating portion 36 has a knurled groove formed on the outer circumferential surface. The nipple 34, the rotation operation part 36, and the tapered fitting part 38 are provided with a tapered fitting part 38 having a tapered outer circumferential surface, and a through hole 4 that passes through them in the axial direction.
0 is formed. Further, a ring member 44 having a thread 42 on the inner peripheral surface is disposed on the outer peripheral side of the tapered fitting part 38, and can be rotated via a pair of connecting parts 46 provided symmetrically with respect to the axis. Part 36
is integrally fixed to the end face of the On the other hand, as shown in FIGS. 5 and 6, the female plug 32 includes a nipple 48 that is airtightly fixed to the end of the conduit 12, and a knurled groove formed on the outer peripheral surface. A rotary operating section 50 and a pair of engagement protrusions 52 that extend integrally from an end surface of the rotating operating section 50 and engage with the thread 42 at the tip end thereof.
is provided with an engaging portion 54 provided symmetrically with respect to the axis, and from the end surface on the engaging portion 54 side, a fitting hole 56 that airtightly fits into the outer circumferential surface of the tapered fitting portion 38. is formed in the axial direction, and a through hole 58 that reaches the fitting hole 56 from the end face on the nipple 48 side is formed in the axial direction. In addition, a fitting hole 56 is provided in a portion of the engaging portion 54 close to the rotation operation portion 50, as shown in an enlarged view in FIG.
An extremely small pore 60 is formed that penetrates the inside and outside. This pore 60 is inserted into the male plug 3 in a state where the engagement protrusion 52 and the thread 42 are engaged.
0 and the female plug 32 are relatively rotated in the opposite direction, so that the tapered fitting portion 38 and the fitting hole 56 are airtightly fitted, as shown in FIG. Also, the opening on the fitting hole 56 side is provided at a position where it is not blocked by the tapered fitting portion 38. In a blood pressure measuring device equipped with such a compression device, in the process of increasing the cuff pressure to a predetermined pressure using the electric pump 20 and then opening the electromagnetic valve 24 to gradually lower the cuff pressure, 16
a cuff pressure sensor 64 connected via conduit 62 to
By detecting the cuff pressure, the systolic blood pressure value and the diastolic blood pressure value are determined based on the occurrence or disappearance of Korotkoff sounds, changes in the magnitude of the pulse wave, etc. At this time, the air in the cuff 10 flows out not only from the aperture 22 but also from the pores 60, so the cuff pressure decreases somewhat faster than in the case where the pores 60 are not provided. The diameter dimension d and the length dimension of 60 are determined by the pressure control of the cuff 10 by the pressure control means 28, specifically when the air in the cuff 10 is naturally exhausted through the electromagnetic valve 24 and the throttle 22 during blood pressure measurement. The air in the cuff 10 is set to be gradually discharged to the extent that the rate of decrease in cuff pressure is hardly affected, and the accuracy of blood pressure measurement is impaired due to the outflow of air from the pores 60. It won't happen. It should be noted that once the blood pressure value is determined in this way, the electromagnetic valve 26 is then opened, the air in the cuff 10 is rapidly discharged, the compression by the cuff 10 is released, and the series of blood pressure measurements is completed. Here, when measuring the state blood pressure, the pressure control means 28
If the control device, electromagnetic valves 24, 26, etc. of the cuff 10 fail and the air in the cuff 10 cannot be discharged from the electromagnetic valves 24, 26, the cuff 10 However, according to the cuff device of the present embodiment, the cuff pressure of the subject is maintained as it is and the pressure from the cuff 10 is not released, which may cause unnecessary pain to the subject.
Since the air in the cuff 10 gradually flows out from the pores 60, the cuff pressure gradually decreases and the compression by the cuff 10 is released. Therefore, there is no risk of causing unnecessary pain to the subject due to such a failure of the pressure control means 28, and the safety and reliability of the compression device are improved. Incidentally, the diameter dimension d is 0.04 mm and the length dimension is 0.15
Five connectors 14 (A~
E) Prepare and connect the cuff 10 with a capacity of 700 c.c. to supply air into the cuff 10 so that the cuff pressure is 300 c.c.
After increasing the pressure until it reaches mmHg, the air inside the cuff 10 is allowed to flow out only through the pores 60, and the cuff pressure is reduced to 0 mm.
The time (minutes) required for the cuff pressure to drop to 300 mmHg, and the rate of drop in cuff pressure V (mmHg/sec.) when the solenoid valve 24 is opened to lower the cuff pressure. The results of the investigation are shown in Table 1. For comparison, the rate of decrease in cuff pressure v (mmHg/sec.) when the pore 60 is closed and air is discharged only from the solenoid valve 24 is also shown. , a~d
The cuff pressure is 240mmHg, 160mmHg, and 80mm, respectively.
This is the descending speed when Hg and 40mmHg.

【table】

[Table] As is clear from Table 1, the above pores 6
0 (diameter d: 0.04mm, length: 0.15mm)
For compression devices equipped with
Even if the pressure control means 28 fails under the condition of 300 mmHg and air cannot be discharged from the solenoid valves 24 and 26, the air in the cuff 10 will flow out through the pores 60 and the cuff pressure will remain at approximately 10 mmHg. It drops to 0mmHg in about minutes. Furthermore, the rate of decrease in cuff pressure during blood pressure measurement, that is, when the solenoid valve 24 is open, is
Cuff pressure is 240mmHg compared to when no pressure is provided.
When a is about 17.5%, when 160mmHg to 80mmHg c,
Although the speed increases by about 8% in d, this difference has little effect on the accuracy of blood pressure measurement. The reason why the outflow time and the rate of descent differ even though the pores 60 of the same size are provided is due to processing tolerances and measurement errors when forming the pores 60. Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments. For example, in the embodiment described above, the connector 14 has a hole 6.
0 is provided, but the cuff 10 is located closer to the cuff 10 than the pressure control means 28 such as the cuff 10 or the conduits 12, 16, 62, etc. communicating with the cuff 10.
There is no problem even if a pore is provided in the passage communicating with 0. Further, the pressure control means 28 of the above embodiment is configured to gradually lower the cuff pressure by opening the electromagnetic valve 24 and naturally exhausting air from the cuff 10 when measuring blood pressure. It is also possible to adopt a pressure control means that raises or lowers the cuff pressure at a predetermined speed or maintains it at a substantially constant pressure by feedback-controlling a pump, exhaust valve, etc. based on the detected cuff pressure. It is possible. In that case, even if the flow rate of air flowing out from the pores 60 is relatively large, it will have little effect on the pressure control of the cuff 10, so the diameter d of the pores 60 may be made somewhat larger. Furthermore, in the above example, the diameter dimension d is 0.04 mm,
When a cuff 10 with a capacity of 700 c.c. is connected to a connector 14 having a pore 60 with a length of 0.15 mm, the time taken for air to flow out of the pore 60 and the drop in cuff pressure during blood pressure measurement We have shown the results of investigating speed, etc., but this is just one specific example.
Of course, the size of the pores 60, the capacity of the cuff 10 used, etc. can be changed as necessary. Although no other examples are given, the present invention can be implemented with various improvements and changes based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a state in which a cuff pressure sensor is connected to a compression device for measuring blood pressure, which is an embodiment of the present invention. FIG. 2 is a partially cutaway front view of the connector provided in the compression device of FIG. 1. FIG. 3 is a front view of the male plug of the connector shown in FIG. 2 with half cut away along the axial direction. Fourth
The figure is a cross-sectional view taken from - in FIG. 3. Fifth
This figure is a front view of the female plug of the connector shown in FIG. 2, with half cut away along the axial direction. Figure 6 is the 5th
It is a view from the right direction of the female plug in the figure. FIG. 7 is an enlarged cross-sectional view of the pores provided in the female plug of FIG. 5. 10... Cuff, 14... Connector, 28... Pressure control means, 60... Pore.

Claims (1)

[Claims for Utility Model Registration] A cuff that is wound around a part of a living body, and a pressure control means that supplies a predetermined fluid to the cuff and controls the pressure of the cuff. A part of the body is compressed with a predetermined pressure, and the blood pressure value is automatically measured in the process of changing the compression pressure. The automatic blood pressure measuring device is of a type that rapidly evacuates the cuff when the measurement is completed, and the cuff is evacuated by the pressure control means in a passage communicating with the cuff at a side closer to the cuff than the cuff or the pressure control means. 1. An automatic blood pressure measuring device characterized by comprising a pore through which fluid within the cuff is constantly discharged to the outside to an extent that does not affect pressure control of the cuff.