JPS60106437A - Exhaust valve of 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 an exhaust valve for controlling the drop in blood pressure in a sphygmomanometer that measures blood pressure by detecting the Korotkoff sound when the blood pressure drops after applying pressure by wrapping a cuff band around the arm. It is.

[Background Art] In a blood pressure monitor, when lowering the pressure of the cuff during blood pressure measurement, it is desired that the blood pressure lowering rate be constant regardless of the pressure value as a condition for accurate measurement. As a way to realize this condition with a simple configuration,
There is one shown in Publication No. 729. This is an elastic cylindrical member that partitions the atmosphere side and the cuff band side, and
A needle-like member is passed through the end face of a cylindrical member whose outer peripheral surface is subjected to pressure from the cuff band side. It is designed to change depending on the pressure value on the cuff band side applied to the member. When the pressure inside the cuff band is high, the area of the ventilation gap is small, and when the pressure is low, the area of the ventilation gap becomes large, but in this case, the needle-like member may shift or come off. If an exhaust valve with such a configuration is built into a rubber ball-shaped pressurizing pump, there is a greater risk that the needle-like member will shift or come off due to its handling. When such a situation occurs, blood pressure cannot be lowered at a predetermined rate, making it impossible to accurately measure blood pressure. Furthermore, since the pressure lowering rate is determined by the outer diameter of the needle member and the elasticity of the cylindrical member, these members must be replaced if the pressure lowering rate is to be adjusted.

1. Purpose of the Invention] The present invention has been made in view of the above points, and its purpose is to be able to lower blood pressure at a constant pressure lowering rate over a long period of time, regardless of the pressure value. Another object of the present invention is to provide an exhaust valve for a blood pressure monitor that can easily adjust the rate of blood pressure reduction.

[Disclosure of the Invention] 3- The present invention provides an elastic sleeve with an opening at one end, which partitions the cuff band side and the atmosphere side, and has a slit formed in the side wall to communicate the two, and which presses the elastic sleeve in the axial direction. The slit is opened by pressing the elastic sleeve in the axial direction by the adjusting means, and by changing the pressing force, the slit is opened. The opening area of the opening is variable. It is preferable to use a screw body as the adjustment means because it facilitates fine adjustment of the opening area of the slit by changing the pressing force.
Further, in this case, the elastic sleeve is not pressed directly by the screw body, but is pressed via a presser, so that the elastic sleeve does not twist.

The present invention will be described in detail below based on illustrated embodiments.

First, the overall structure of the blood pressure monitor will be explained. In the figure, 1 is a cuff band, 2 is a main body, and these two and a manual pressure pump 3 constitute the blood pressure monitor. The pressurizing pump 3 is equipped with an exhaust mechanism 4 and is connected to the cuff band 1 via the main body 2 by an air pipe 224-.

A rectangular main body 2 arranged and fixed on the surface of the cuff band 1 has a housing 21 with a curved lower surface, which houses a printed circuit board with electrical circuit components mounted thereon, a pressure sensor 27, a battery, etc. A digital blood pressure display unit 10 is provided on the cuff band 1, and is attached to the surface of the cuff band 1 so as to cross the cuff band 1, so that when the cuff band 1 is wrapped around the arm,
The direction of the operator's hand of the main body 2 is made to match the direction of the arm. Further, the length of the cuff band 1 in the width direction of the main body 2 is made smaller than the width of the cuff band 1 so that the main body 2 does not protrude from the cuff band 1.

The cuff band 1 is formed by high-frequency welding the edges of multiple sheets made of soft vinyl chloride resin, etc., and houses a microphone 9 for detecting Korotkoff sounds connected to a printed circuit board in the main body 2. There is. Also this cuff band 1
A binding strap portion 11 extends from one end of the strap. Binding part 11
is smaller in width than the cuff band 1, and is provided with a plurality of elongated holes 30 that are long in the width direction at intervals in the technique direction, and the inner surface has a surface shape of one end of the cuff band 1 over the entire surface. A planar fastener F2 that engages with the fastener F1 is provided. Also, a sheet fastener F3 that engages with the sheet fastener F1 is provided on the outer surface of the free end of the binding portion 11.

When attaching the cuff band 1 to the arm, first temporarily fasten the cuff band 1 to the arm using the elasticity of the elastic curved plate built into the cuff band 1, and then attach the planar fastener F2 on the inner surface of the cuff band 11 to the cuff band. The sheet fastener F1 of the cuff band 1 is engaged with the sheet fastener F1 of the cuff band 1, and the sheet fastener F3 attached to the outer surface of the free end of the folded cuff band 11 is inserted through the elongated hole 30 of the cuff band 1. It makes them engage. In this state, if air is sent into the cuff band 1 from the pressurizing pump 3 connected to the main body 2, the compression bag portion of the cuff band 1 is inflated, and the pressure in the pressure bag portion at this time is measured by the pressure sensor 6. Korotkoff sound is detected by microphone 9.
detected by the amplifier circuit 23, as shown in FIG.
Korotkoff sound discrimination filter 24, level detection circuit 25
, the operation control circuit 26, the pressure sensor 27, and the analog-to-digital conversion circuit 28, and the blood pressure value is displayed on the digital display section 10. 29 is a memory circuit for storing the systolic blood pressure value and the diastolic blood pressure value, 5 is an exhaust valve, and 12 is a rapid exhaust valve.

Now, the exhaust mechanism 4 is equipped with an exhaust valve 5 and a quick exhaust valve 12, and as shown in FIG. The air pipe 22 is disposed between the pressurizing pump 3 having an intake valve 33 at its rear end, and the air pipe 22. and exhaust valve 5
is located within the pressurizing pump 3, and a quick exhaust valve 12 is located between the exhaust valve 5 and the air pipe 22. The quick exhaust valve 12 has a ventilation pipe 14 housed within the housing 13.
A spherical valve body 37 is provided in the middle of the vent pipe 14, is slidable in a direction perpendicular to the axial direction of the ventilation pipe 14, and is biased by a spring 36 in a direction in which it comes into contact with the O-ring 35.
and a push button 38 that is in contact with the valve body 37 through an exhaust port formed in the middle of the ventilation pipe 14, and the exhaust port is normally closed by contact with the O-ring 35 of the valve body 37 = 7
- When the push button 38 is pressed and the valve body 37 is pushed down, the exhaust port opens. Note that both ends of the ventilation pipe 14 are communicated by a detour that bypasses the quick exhaust valve 12. In addition, the intake valve 33 in the pressure pump 3 is not a perfect check valve, and when the pressure inside the pressure pump 3 increases slowly, the air inside the pressure pump 3 is released to the atmosphere through the intake valve 33. .

The exhaust valve 5, which gradually removes the air in the cuff band 1 and lowers the pressure during blood pressure measurement, is formed of an elastic sleeve 6 housed inside one end of the vent pipe 14. This elastic sleeve 6 has a cylindrical shape with one end closed as shown in FIGS. A plurality of slits 7 formed
The outer diameter of the vent pipe 14 is slightly smaller than the inner diameter of the portion of the vent pipe 14 that accommodates the elastic sleeve 6, and the outer circumferential portion of the flange 40 is connected to the vent pipe 14.
It is housed in the vent pipe 14 so as to be in contact with the step on the inner surface, and the adjusting screw 8 screwed into the opening of the vent pipe 14 is made of a non-slip material such as polyacetal resin. The inner periphery of the opening of the elastic sleeve 6 is pressed in the axial direction via a ring-shaped retainer 9.

The slit 7 in the elastic sleeve 6 is connected to this adjusting screw 8.
The elastic sleeve 6 is opened by the strain caused by the pressing force applied thereto, thereby communicating the inside of the pressurizing pump 3 and the cuff band 1 side.

Further, this opening area can be adjusted by turning the adjusting screw 8 to change the pressing force.

At this time, since the presser 9 is interposed between the adjusting screw 8 and the elastic sleeve 6, the elastic sleeve 6 will not be twisted.

When the pressure pump 3 is expanded and contracted by hand, the intake valve 3
Air flowing into the pressure pump 3 from the elastic sleeve 6
Pass through the slit 7 from the inside while expanding it to the main body 2.
is sent to cuff band 1 through.

The blood pressure is gradually lowered by exhaustion during blood pressure measurement through the exhaust valve 5 and the intake valve 33. At this time, when the pressure on the cuff band 1 side is high, the elastic sleeve 6 is influenced by this pressure and reduces the opening area of the slit 7. Then, as the pressure on the cuff band 1 side becomes lower, the elastic sleeve 6 gradually increases the opening area of the slit 7 in response to this pressure change. Therefore, as shown in FIG. 6, the pressure within the cuff band 1 is lowered at a constant pressure lowering rate regardless of the pressure, and this pressure lowering rate is determined by the pressing force against the elastic sleeve 6 by the adjusting screw 8. It can be adjusted by changing it. Once the measurement of the diastolic blood pressure value is completed, press the push button 38 to close the rapid exhaust valve 12.
Open the cuff band 1 and exhaust air from here to remove the air inside the cuff band 1.

[Advantageous Effects of the Invention 1] As described above, in the present invention, the slit provided in the side wall of the elastic sleeve is opened by applying a pressing force in the axial direction to the elastic sleeve using an adjustment means, thereby communicating the cuff band side and the atmosphere side. There is no need for parts such as needle-like members that may slip or come off, and since the slit's opening area changes with the pressure applied to the elastic sleeve, the pressure remains constant regardless of the pressure value. By changing the pressing force applied to the elastic sleeve from the adjustment means, variations in the pressure reduction rate due to slit processing errors, elasticity errors of the elastic sleeve, etc. can be eliminated. The blood pressure lowering rate can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a blood pressure monitor equipped with one embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the pressurizing pump and exhaust mechanism same as above, FIG. 3 is an enlarged cross-sectional view of the exhaust valve same as above, FIG. The figure is a pressure drop characteristic diagram of the same exhaust valve as above, where 1 is the cuff band, 4 is the exhaust mechanism,
5 is an exhaust valve, 6 is an elastic sleeve, 7 is a slit, 8 is an adjustment screw, and 9 is a retainer. Agent Patent Attorney Ishi 1) Chief Seven Procedural Amendments (Voluntary) July 30, 1980 1. Indication of the case 1988 Patent Application No. 213041 2. Name of the invention: Exhaust valve 3 for blood pressure monitor. Relationship with the patent applicant case Address: 1048 Kadoma, Kadoma City, Osaka Prefecture Name (
583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent postal code 530 8, Contents of the amendment as shown in the attached sheet Application number: Patent Application No. 1, No. 1, page 5, line 16 of the specification of the present application 1 Microphone 9'' is corrected to ``Microphone 41''. 2. Same as above, page 6, lines 16 to 17, “
"Pressure sensor 6" is corrected to "Pressure sensor 27." 3. Correct "Microphone 9" from line 17 to line 18 on the same page as "Microphone 41". 4.Amend Figure 5 of the drawings as shown in the attached sheet. Agent Patent Attorney Ishi 1) Chief 71-

Claims (3)

[Claims] (1) An elastic sleeve that is open at one end and has a slit formed in the side wall that partitions the cuff band side and the atmosphere side and communicates the two, and an adjustment means that presses this elastic sleeve in the axial direction to adjust the opening area of the slit. An exhaust valve for a blood pressure monitor, comprising: (2) The elastic sleeve has a flange at the periphery of the opening and is held by the flange, and the inner peripheral part of the opening is the part to be suppressed by the adjustment means (claim 1) Exhaust valve of the blood pressure monitor described. (3) The exhaust valve for a blood pressure monitor according to claim 1 or 2, wherein the adjusting means comprises a screw body and a presser interposed between the screw body and the elastic sleeve.