JPS5812021B2 - Cuff mechanism for automatic cuff wrapping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cuff mechanism for an automatic cuff wrapping device that applies a restoring force to a cuff that is automatically wrapped around a part of the human body such as an arm, particularly the upper arm, in order to measure blood pressure. .

Generally, the automatic cuff wrapping device of a fully automatic blood pressure measuring device consists of a cuff and a cuff tensioning device.

Among these, the cuff is formed into a band shape by overlapping two cloth materials and sewing the peripheral edges together.A flexible fluid chamber (rubber bag) that can supply and discharge fluid, such as air, is housed within the cloth material, and a pair of cuffs is formed. is formed.

In this type of automatic cuff wrapping device, after blood pressure measurement is completed or when measurement is stopped for some reason, the cuff wrapped around the arm is loosened, and the arm can be freely inserted for the next measurement. It is necessary to maintain the condition.

Otherwise, there will be a sense of uneasiness when inserting the arm into the cuff that is in a deformed shape, and the cuff will be wrapped differently depending on the size of the inserted arm, which may reduce the reliability of the measured values. There is a problem with the decline.

For this purpose, FIG. 1 shows a schematic configuration diagram of an already proposed cuff having an elastic member for return.

A is a front view thereof, and B is a sectional view taken along Pl-P1 of A.

In the figure, cuff 1 is a commonly used cuff (inner cuff)
2 and an outer cuff 3 integrally provided on the outside of the inner cuff 2.

The inner cuff 2 is formed into a band shape by overlapping two cloth materials 4 and 5 and sewing the peripheral edges, and has a flexible fluid chamber, for example, a rubber bag 6, that can supply and discharge fluid within the cloth materials 4 and 5. are housed and formed integrally.

Note that the conduits 6B and 6C provided in the rubber bag 6 are connected to an air supply device and a blood pressure indicating device, respectively, which are not shown.

The outer cuff 3 consists of a cloth material 7 provided on the outside of the cloth material 5, and a cuff return elastic member, for example, a leaf spring 8, inserted in the form of a band between the cloth materials 5 and 7.

The cuff mounting plate 9 is inserted between the cloth material 5 and the leaf spring 8, and clamps the leaf spring 8 and the cloth material 7 at approximately the center of the rubber bag 6 between the cuff mounting plate 10.

This mounting plate 9 is fixed to a mounting base 11 that supports the arm portion.

Therefore, the outer cuff 3 is attached to the mounting base 11 by the cuff mounting plates 9 and 10, and the inner cuff 2 having the rubber bag 6 is not directly fixed to the mounting base 11 but is separated.

Next, FIG. 2 shows a schematic explanatory diagram of the cuff wrapped state.

In the figure, 12 indicates the upper arm.

The cuff 1 consisting of the rubber bag 6 and the leaf spring 8 is in a restored state due to the restoring force of the leaf spring 8, and the end of the cuff 1 is pulled in the direction of the arrow A by a cuff tensioning device (not shown), and the leaf spring 8 is pulled. Due to the circular holding characteristic of , the rubber bag 6 is contracted while maintaining its cylindrical shape, and the rubber bag 6 is uniformly wrapped around the entire circumference of the upper arm 12.

1A, 6A, and 8A are cuff 1. The wrapping states of the rubber bag 6 and the leaf spring 8 are shown.

Next, FIG. 3 shows a sectional view of the cuff in FIG. 1 in a wrapped state.

In the figure, 13 is a humeral protrusion on the shoulder side of the upper arm 12, and 14 is an arm rest.

The arm inserted into the cuff 1 is supported by the arm rest 14, and when the cuff 1 in the restored state is wrapped around the upper arm 12, the upper arm protrusion 1
The cuff 1A that is wrapped around the upper arm 12 contacts the upper arm 12, and a gap 15 is created between the upper arm 12 and the upper arm 12.

Due to this gap 15, the cuff 1AH cannot be tightly attached to the upper arm 12, so that a sufficient wrapping condition cannot be obtained, and therefore, an accurate blood pressure measurement value cannot be obtained.

To this end, it is conceivable to reduce the overall width of the arm spring 8 so that the plate spring 8 does not come into contact with the upper arm protrusion 13, and to bring the cuff 1A into close contact with the upper arm 12 by reducing the plate spring 8.

However, since the leaf spring 8 becomes smaller overall in this method, the return force of the leaf spring 8 becomes weak, and there is a risk that a wide measurement range that can be used for the upper arm 12 with a diameter of approximately 60 mm to 150 mm may not be obtained. Ta.

Furthermore, instead of reducing the width of the leaf spring 8, there is also a method of increasing the plate thickness to compensate for the return force.

However, when the plate thickness is increased, the return force exceeds the elastic limit,
This has the disadvantage that the life of the leaf spring is shortened because permanent deformation tends to occur.

In view of the above-mentioned points, the present invention eliminates the drawbacks of the prior art and ensures the cuff wrapping operation without impairing the return force of the cuff.
It is an object of the present invention to provide a cuff mechanism for an automatic cuff wrapping device that provides accurate blood pressure measurement values.

According to the present invention, such a purpose is provided along the outer circumferential surface of the rubber bag and has a length spanning almost the entire length of the cloth material,
A cuff return elastic member is provided, the width of which is reduced by removing a portion corresponding to the shoulder side path origin of the upper arm, and the width of the portion corresponding to the portion other than the shoulder side raised portion is approximately equal to the width of the cloth material. This is achieved by

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 4 shows a schematic configuration diagram of an embodiment of the present invention, and A is a front view thereof and a sectional view taken along line P2-P2 of BUA.

In the figure, parts having the same functions as those in FIG. 1 are given the same reference numerals.

Cuff 16 consists of ipsilateral cuff 2 and lateral cuff 17.

In this outer cuff 17, an elastic member for returning the cuff, in this embodiment a plate spring 18, is provided between the cloth material 5 and the cloth material 7 along the outer circumferential surface of the rubber bag 6, extending over almost the entire length of the cloth materials 5 and 7. It is inserted across the board.

The leaf spring 18 and the cloth material 7 are held between the cuff mounting plates 9 and 10, and the mounting base 1 is located approximately in the center of the rubber bag 6.
Fixed to 1.

The leaf spring 18 in the vicinity of the mounting base 11 forms a wide portion 19 having a width dimension D1 approximately equal to the width of the cloth material 7.

On the other hand, a narrow portion 20 having a width dimension D2 smaller than the width of the cloth material 7 is formed in another portion of the leaf spring 18.

Note that a roundness with a radius R is provided between the wide portion 19 and the narrow portion 20.

Next, FIG. 5 shows a sectional view of the cuff of FIG. 4 in a wrapped state.

In the figure, parts having the same functions as in FIGS. 3 and 4 are given the same reference numerals.

16A, 18A and 6A are cuff 16. The state in which the leaf spring 18 and the rubber bag 6 are wrapped is shown.

The narrow part 20 of the leaf spring 18 has a reduced width by removing the part corresponding to the upper arm protrusion 13 and contacts the upper arm 12 locally, but the rubber bag 6 contacts the upper arm 12 entirely.

Further, since the wide portion 19 has a width corresponding to a portion other than the upper arm raised portion 13 and is formed to be approximately equal to the width of the cloth material 7, the upper arm 12
fully contact the lower surface of the

When this cuff 16 is wrapped around the upper arm 12, there is no gap between the rubber bag 6A and the upper arm 12, so that the cuff 16 is completely tightly wrapped.

According to numerous experiments by the discoverer, it is sufficient for the width D2 of the narrow portion 20 to be about 2/3 of the width of the cloth material 7.

Therefore, as the leaf spring 18 contracts while maintaining its cylindrical shape due to the winding action of the cuff 16, the bending stress in the wide part 19 increases, and the restoring force in the narrow part 20 is prevented from decreasing, making it suitable for long-term use. I can bear it.

As described above, according to the present invention, the flat spring having a circular holding characteristic and provided to apply a restoring force to the cuff is provided with a wide part and a narrow part, thereby improving the restoring property of the cuff. It has the advantages of good adhesion, reliable cuff wrapping, and accurate blood pressure measurements.

[Brief explanation of the drawing]

Fig. 1 shows a schematic configuration diagram of the cuff that has already been proposed, A is a front view thereof, B is a Pl-P1 sectional view of A, Fig. 2 is a schematic explanatory diagram of the cuff wrapped state, and Fig. 3 is a cuff. 1 is a cross-sectional view of the wrapped state of the cuff, FIG. 4 is a schematic configuration diagram of an embodiment of the present invention, A is a front view thereof, B is a P2-P2 cross-sectional view of A, and FIG. FIG. 3 is a sectional view of the cuff shown in the figure in a wrapped state. 6: Rubber bag, 12: Upper arm, 13: Upper arm protrusion, 16: Cuff, 17: Outside cuff, 18: Leaf spring, 19: Wide part, 2
0: Narrow part.

Claims (1)

[Claims] 1 A cloth material formed into a band shape by overlapping and sewing the peripheral edges, and a flexible fluid chamber housed within the cloth material and capable of supplying and discharging fluid, and having a circumferential direction at the end of the cloth material. In a blood pressure measurement cuff that is automatically wrapped around the upper arm inserted by means of pulling the cuff, the cuff is provided along the outer peripheral surface of the flexible fluid chamber and has a length that spans almost the entire length of the cloth material; cuff return elastic, the width of which is reduced by removing a portion corresponding to the raised portion on the shoulder side of the upper arm, and the width of the portion corresponding to the portion other than the raised portion on the shoulder side is formed to be approximately equal to the width of the cloth material; A cuff mechanism for an automatic cuff wrapping device, characterized by comprising a member.