JPH0345237A - Kerf device for blood pressure measurement - Google Patents

Abstract

PURPOSE:To improve the measurement precision by forming a pressurized air introducing spaces into plural layer form inside a kerf and uniformly pressing an arm thus improving the close adhesiveness. CONSTITUTION:Inside a kerf 21, the pressurized air introducing spaces S1 and S2 are formed into two layer form, and an inside kerf body 21a having a flat rectangular form which forms the inside introducing space S1 and an outside kerf body 21b having a flat rectangular form which forms the outside introducing space S2 are partially welded to form the two-layer constitution. Thus, by using a multiple structure consisting of the pressurized-air introducing spaces in plural layer form as kerf 21, the bulged parts of the center parts of these introducing spaces offset each other, and the difference between the center part of the kerf and the peripheral part can be suppressed to a small value. therefore, the kerf bulges uniformly, and the width of the hemostatic operation is correctly determined, and the close adhesiveness for a blood pressure measurement part is improved, and the precision in the blood pressure measurement can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a cuff device for blood pressure measurement that uses a cuff and a microphone to measure blood pressure.

[Prior Art] Conventionally, as this type of cuff device for blood pressure measurement, there is one that uses the arm as the blood pressure measurement site, as shown in FIGS. 6 to 8.

In this cuff device, a cuff I made of natural rubber is housed inside a cuff case 2, and the cuff I is attached to the cuff case 2 by an O-ring 3 i-1.

The cuff 1 is originally formed into a flat plate with a rectangular plane, and inside thereof, a pressurized air introduction space is formed over the entire length, and the cuff 1 is rounded into a letter 0 shape and attached to the case 2. An introduction pipe 4 for introducing pressurized air into the pressurized air introduction space is attached to the right side edge of the cuff l in FIG. 6. The case 2 is formed with a slit t2a extending from the right end to the left end in FIG. (The case 2 and the cuff I are integrally covered.A jack is attached to the opening on the left side of the arm cuff 5 in FIG. 6, so that it can be closed.

A pocket 5a for storing a microphone M is formed inside the wristband cloth 5. This microphone M
This method electrically detects the Korotkoff sound of the arterial blood vessel of the arm inserted inside the cuff L.

Reference numeral 6 denotes a fixing metal fitting, which is attached to the case 2 from above the wristband cloth 5 with a screw 7, and is attached to the case 2 through the slit 2a of the case 2.
This prevents the arm cuff 5 from spreading and also prevents the arm cuff 5 from shifting. Further, the case 2 covered with the armband cloth 5 is attached onto a cushion fitting 9 with screws 8. A hard urethane arm cuff cushion 10 is bonded to the lower side of the cushion fitting 9, and a cushion fitting 11 is further bonded to the lower side of the arm cuff cushion IO.

When using the conventional cuff device configured as described above, the arm where the blood pressure will be measured is first inserted into the case 2 from the left side in FIG. 6. At this time, the arterial blood vessel of the arm is placed under the microphone M to face it. Then, pressurized air is introduced into the pressurized air introduction space in the cuff I through the introduction tube 4, and while compressing the arm, the microphone M detects the Korotkoff sound of the arterial blood vessel.

[Section M where the invention is intended to be resolved] However, such conventional cuff devices have the following problems.

■The pressurized air introduction space formed inside the cuff I is only one layer, so when pressurized air is introduced into the space, the central part of the cuff I expands greatly, and the bulge with the circumference increases. The difference becomes large. FIG. 8 shows a one-layer structure similar to cuff I when it is flattened and inflated.

As a result, the cuff I inflates non-uniformly, making it impossible to press the arm uniformly, leading to poor adhesion, and the width of hemostasis not being accurately determined, resulting in poor measurement accuracy.

■Since the cuff I is made of natural rubber, pinholes are likely to form, and it is not suitable for mass production.

This invention aims to solve such problems.

[Means for Solving the Problems] The cuff device for blood pressure measurement of the present invention introduces pressurized air into the inside of the cuff, sets the cuff so as to wrap it around the blood pressure measurement site, and sets the cuff around the blood pressure measurement site. A cuff device for blood pressure measurement that detects Korotkoff sounds in arterial blood vessels using a microphone, characterized in that a plurality of layers of pressurized air introduction spaces are formed inside the cuff.

[Function] The cuff device for blood pressure measurement of the present invention uses a multilayered structure in which pressurized air introduction spaces are formed in multiple layers, so that the bulges in the center portions of the introduction spaces cancel each other out. By matching, the difference in bulge between the center and circumference of the cuff is kept small. This inflates the cuff uniformly, accurately determines the width of hemostasis, improves adhesion to the blood pressure measurement site, and improves blood pressure measurement accuracy.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, 21 is a cuff made of synthetic resin such as thermoplastic polyurethane resin or vinyl chloride (for example, 0.3 mm thick).
), and inside thereof, two pressurized air introduction spaces Sl and S2 are formed in two layers. Cuff 21 was originally
The inner cuff body 21a is rectangular in plane and is formed into a rectangular plane and is rounded into a 0 shape, and the inner cuff body 21a is rectangular in plan and forms the inner introduction space S1, and the outer cuff body is rectangular in plane and forms the outer introduction space S2. It has a two-layer structure in which 21b is partially welded. That is, on the opposing surfaces of the inner cuff body 21a and the outer cuff body 21b, that is, on the outer surface of the inner cuff body 2Ia (the upper surface in FIG. 3) and the inner surface of the outer cuff body 21b (the lower surface in FIG. 3), A four-sided portion PI forming a planar rectangle,
P2. P3. P4 are welded together.

Further, an inner cuff body 21 is provided on the outer surface of the outer cuff body 21a.
A first introduction pipe 22a leading to the outer cuff body 21b and a second introduction pipe 22b leading to the outer cuff body 21b are attached. That is, regarding the first introduction tube 22a, the outer surface and the inner surface of the outer cuff body 21a and the outer surface of the inner cuff body 21b are welded together in the planar inner tank portion P6 surrounding it, so that the inner cuff It communicates with the introduction space St of the body 21a.

On the other hand, the second introduction tube 22b is directly welded to the outer surface of the outer cuff body 21a, so that
+Communicates with the introduction space S2 of the cuff body 21b.

Further, a sensor retaining ring 23 is welded to a fixed position on the inner surface of the inner cuff body 21a. This retaining ring 2
3 is an elastic ring into which the microphone M is fitted, as shown in FIG. 4, and the inner cuff body 21a
A part of the circumference of the retaining ring 23 is welded to an arcuate portion P7 (see FIG. 2) on the inner surface of the retaining ring 23. The arcuate portion P7 is located at the center line L (second line) in the width direction of the cuff 21.
(see figure).

In addition, in the cuff 21, the straight portion P8 located a predetermined distance away from the attachment position of the retaining ring 23 is attached to the outer cuff body 2.
The inner and outer surfaces of 1b are welded together. therefore,
This welded portion P8 serves as a suppressing portion that suppresses the swelling of the sea urchin cuff 21 (j in FIG. 3).

The cuff 21 as described above is rolled into a 0-shape and is housed inside a hard cuff case 24.

The cuff case 24 has a cylindrical shape, and the first part of the cuff 2I is provided on the outer circumference thereof. The first tube is positioned by passing the second introduction tubes 22a and 22b from the inside to the outside. Second positioning hole 24
a, 24. b is provided.

The armband case 2/l containing the cuff 21 is a bag-shaped armband cloth 2.
It is contained within 5. This armband cloth 25 is made by sewing together the right end side peripheries of the inner cylindrical part 25a and the outer cylindrical part 25b in FIG. An annular space is formed that is open to.

The cuff case 24 containing the cuff 2I is inserted through the left opening of the annular space. The outer cylindrical portion 25b has holes 25c, 25 through which the second introduction tubes 22a, 22b of the cuff 2 are passed outward.
cl has been opened. Further, on the right end side of the armband cloth 25 in FIG. 1, there is a hole (
(not shown) is opened.

Arm cuff case 2 stored in arm cuff cloth 25 together with cuff 2I
4 is attached onto the cushion fitting 27 by screws 26. A hard urethane cuff cushion 28 is glued to the lower side of the cushion fitting 27, and furthermore,
A cushion metal fitting 29 is provided on the underside of the arm cuff cushion 28.
is glued.

Next, the effect will be explained.

First, the arm where the blood pressure will be measured is inserted into the cuff case 24 from the direction of arrow A in FIG. And microphone M
Opposing the arterial vessels of the arm under the.

Then, number one. Pressurized air is introduced into the inner and outer introduction spaces Sl and S2 through the second introduction tubes 22a and 22b, and while compressing the arm, the microphone M detects the Korotkoff sound of the arterial blood vessel. In this way, blood pressure measurement is performed using the arm as the blood pressure measurement site.

By the way, in the cuff 21 having a double structure, when pressurized air is introduced into the inner and outer introduction spaces Sl and S2, the bulges of the overlapping central parts cancel each other out,
As a result, the difference in bulge between the central portion and the peripheral portion of the cuff 21 is kept small. Therefore, the cuff 21 inflates uniformly, the width of hemostasis is accurately determined, and the tightness against the arm is improved.

FIG. 5 is a diagram showing a double-layer structure similar to the cuff 21 when it is flattened and inflated. In addition, the introduction spaces Sl, S
It is not necessary to partition the cells into two, and a multilayer structure of three or more layers may be used.

Further, since the microphone M is attached to a fixed position on the inner surface of the cuff 2I, the positional relationship between the cuff 21 and the microphone M will not shift due to insertion and withdrawal of the arm.

Further, the introduction tubes 22a, 22b are attached to the outer surface of the cuff 21, and the introduction tubes 22a, 22b are inserted into the positioning holes 24 of the cuff case 24. cuff 21 by inserting and pulling out the arm.
It never shifts. Moreover, the cuff 21 has a portion P at which the microphone M is attached at a predetermined distance from the position.
8, the bulge is suppressed), so the microphone M is always located at the moderate bulge of the cuff 21.
It will be in close contact with the arterial blood vessels of the arm.

Furthermore, the cuff 21 made of synthetic resin has superior processability compared to conventional cuffs made of natural rubber, and is suitable for mass production.

Moreover, it is difficult to form pinholes. Further, the same effect can be obtained even if the cuff 2I is made of synthetic rubber.

[Effects of the Invention] As explained above, the cuff device for blood pressure measurement of the present invention uses a cuff with a multi-layer structure in which pressurized air introduction spaces are formed in multiple layers. The bulges between the central parts of the cuff cancel each other out, and the difference in the bulges between the central part and the circumferential part of the cuff can be kept small. As a result, the cuff inflates uniformly, the width of hemostasis is accurately determined, and the adhesion to the blood pressure measurement site is improved, improving blood pressure measurement accuracy.

Furthermore, by making the cuff made of synthetic resin, it is possible to improve processability as compared to conventional cuffs made of natural rubber, thereby realizing improvement in mass productivity.

In addition, the cuff device for blood pressure measurement of the present invention can be applied as a cuff device in which the cuff is arranged inside a case and a blood pressure measurement site such as an arm is inserted into the case, or it can be applied to a blood pressure measurement site such as an arm. It can also be used as a cuff device in which the cuff is directly wrapped around the cuff, and its range of applications is extremely wide.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining one embodiment of the present invention, in which FIG. 1 is an exploded perspective view, FIG. 2 is a developed view of the cuff, and FIG. - Sectional view along line ■, 4th
The figure is an enlarged cross-sectional view of the microphone installation section.
The figure is a side view of the two-layered cuff when it is inflated while remaining flat. 6 to 8 are diagrams for explaining the conventional example, in which FIG. 6 is an exploded perspective view, FIG. 7 is a front view, and FIG.
FIG. 7 is a side view of the layered cuff when it is inflated while remaining flat. 21...Cuff, 21a...Inner cuff body, 21b...Outer cuff body, -, 11 22a, 22b...Introduction tube, 23... ...Sensor retaining ring, 2゛4...
・Arm band case, 25...Arm band cloth, R1, R2・
...Introduction space for pressurized air, M...Microphone.

Claims (2)

[Claims] (1) In a cuff device for blood pressure measurement, in which pressurized air is introduced into the inside of the cuff, the cuff is set so as to be wrapped around the blood pressure measurement site, and the Korotkoff sound of the arterial blood vessel at the blood pressure measurement site is detected by a microphone. . A cuff device for blood pressure measurement, characterized in that a plurality of layers of pressurized air introduction spaces are formed inside the cuff. (2) The cuff device for blood pressure measurement according to claim 1, wherein the cuff is made of synthetic resin.