JPH11318A - Blood pressure gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep air capacity in an ischemic bag at using time almost constant, and improve measuring accuracy by providing an expansion restricting means which can expand a winding remaining part of a cuff remaining without being wound round a measuring object region by air and restricts its expansion to a fixed quantity. SOLUTION: A cuff housing part 6a constitutes an expansion restricting means 6 which can expand a winding remaining part 4b of a cuff 4 and restricts its expansion to a fixed quantity. The cuff housing part 6a is formed in a box shape having an inside plate 14 formed in a curved shape according to an outer peripheral shape of a measuring object region 1 and an outside plate 15 formed in a curved shape at the same bending rate as it, and a cavity 6b capable of housing the winding remaining part 4b of the cuff 4 so as to be freely taken in and out, is formed inside of it. The cavity 6b has a uniform thickness (d) over the total length, and is set so that an expansion quantity of a part 4a wound round the measuring object region 1 of the cuff 4 and an expansion quantity of the winding remaining part 4b become almost the same value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sphygmomanometer for measuring blood pressure by compressing a site to be measured.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
The blood pressure is measured by wrapping the cuff 4 around a measurement site (for example, a human arm), supplying air to a blood-bag (not shown) provided in the cuff 4 to inflate the blood bag, and pressing the measurement site. Like that. At this time, the unwound portion 4b remaining without being wound around the measured portion of the cuff 4 is wound around the inversion ring 40, and the unwound portion 4b is fixed to another portion of the cuff 4 by the fastener 60 provided on the surface of the cuff 4. , And only the portion 4a wound around the measured portion of the cuff 4 is inflated.

[0003]

However, in the conventional structure in which the unwound portion 4b of the cuff 4 is wound around the reversing ring 40, the cuff 4 is unwound when the cuff 4 is inflated to compress the portion to be measured. Air does not enter the portion 4b. That is, the supply of air is shut off at the reversing ring 40, and the unwound portion 4b does not expand. Therefore, when the circumferential length of the measured portion changes, the unwound portion 4
The length of b also changes, and the volume of air contained in the blood cuff 4 of the cuff 4 at the time of compression changes accordingly. Such a change in the air volume greatly affects the exhaust characteristics of the cuff 4 during use, which affects the determination accuracy in blood pressure determination and lowers the measurement accuracy.

[0004] The present invention has been made in view of the above-mentioned conventional example, and it is possible to maintain a substantially constant air volume in a blood bag during use without being affected by the circumferential length of a portion to be measured. It is an object of the present invention to provide a sphygmomanometer capable of improving measurement accuracy, and to provide a sphygmomanometer capable of improving cuff storage and compactness when the cuff is not used. It is another object of the present invention to provide a sphygmomanometer capable of easily adjusting the length of a cuff.

[0005]

According to the present invention, a cuff 4 is wound and inflated with air in accordance with the circumferential length of a portion 1 to be measured to compress the portion 1 to be measured. In the sphygmomanometer that measures blood pressure by performing the operation, the cuff 4 has an unrolled portion 4b that is not wound around the measurement site 1 and is provided with an expansion restricting means 6 that can be expanded with air and restricts the expansion to a fixed amount. With this configuration, air can be sent into the unwound portion 4b of the cuff 4 and the expansion of the unwound portion 4b is limited to a certain amount by the expansion limiting means 6. So cuff 4
The expansion amount becomes substantially equal over the entire length of the. Therefore, even when the length of the measurement site 1 in the circumferential direction changes and the length of the unrolled portion 4b changes, the volume of air contained in the blood bag of the cuff 4 at the time of compression is kept substantially constant. , Since the air volume hardly changes, the cuff
Without affecting the exhaust characteristics.

The expansion restricting means 6 is preferably formed in a box shape in which the unwound portion 4b of the cuff 4 can be freely taken in and out, and in this case, the unwound portion 4b of the cuff 4 is housed in the box shape. Thus, the air volume in the blood bag during use can be kept substantially constant without being affected by the circumferential length of the portion 1 to be measured. In order to further improve the measurement accuracy, it is preferable that the thickness d of the cavity 6b in the box is substantially constant over its entire length.
However, it is preferable that the expansion amount of the portion 4a wound around the measurement site 1 of the cuff 4 and the expansion amount of the unwound portion 4b are set to be substantially the same value.

Preferably, the inflation limiting means 6 is provided with a length adjusting mechanism 7 for adjusting the length of the cuff 4 in accordance with the circumferential length of the portion 1 to be measured. The portion 1 can be easily pressed, and the length of the cuff 4 can be adjusted when the cuff 4 is not used, so that the entire blood pressure monitor 2 can be reduced in size. It is preferable that the inflation limiting means 6 can be fixed to the cuff 4 or the sphygmomanometer main body 3. In this case, the inflation limiting means 6 is fixed to the cuff 4 at the time of measurement, and the inflation limiting means 6 is attached to the sphygmomanometer main body 3 after use. By fixing the cuff, the cuff storage section 6a does not become an obstacle during measurement or after use, and the storage performance can be improved.

It is preferable that the expansion restricting means 6 is formed in a curved shape in conformity with the outer peripheral shape of the part to be measured 1. In this case, the expansion restricting means 6 can easily conform to the outer peripheral shape of the part to be measured 1 and expand. Space saving of the limiting means 6 can be achieved. The curved portions are the curvatures Ra and Rb.
It is preferable that the sphygmomanometer 2 is constituted by a plurality of arc surfaces 50 and 51 different from each other. In this case, the expansion restricting means 6 is made compact, and the whole blood pressure monitor 2 including the expansion restricting means 6 can be reduced in size.

It is preferable that the expansion restricting means 6 also serves as a storage case when the cuff 4 is contracted and stored in a small loop shape. In this case, the number of parts can be reduced and the storage performance can be improved. And the cuff 4 can be sufficiently protected. It is preferable that the length adjusting mechanism 7 be provided with a lock mechanism 8 for locking the cuff 4 at the adjusted length. In this case, once the length of the cuff 4 is adjusted,
This state can be easily maintained, and the need for readjustment at the next measurement can be eliminated.

It is preferable to configure the expansion restricting means 6 by reducing the elasticity of the jacket 5 in the unwound portion 4b of the cuff 4 compared to the elasticity of the jacket 5 in other portions of the cuff 4. In this case, the structure of the expansion restricting means 6 can be simplified. It is preferable to form the expansion restricting means 6 by sticking the low elastic material 30 to the jacket 5 of the unrolled portion 4b of the cuff 4; in this case, the structure of the expansion restricting means 6 is further simplified. Can be.

The expansion restricting means 6 preferably comprises a case 9 for covering the cuff 4 with the unrolled portion 4b of the cuff 4 and suppressing the expansion of the cuff 4; The expansion of the remaining portion 4b can be suppressed by the case 9, and the expansion can be limited to a certain amount. Therefore, the inside of the blood-bag is not affected by the circumferential length of the portion 1 to be measured. Can be kept substantially constant.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. As shown in FIG. 1, the cuff 4 of the sphygmomanometer 2 includes a jacket 5 made of cloth or the like, and a blood bag (not shown) stored in the jacket 5. Blood cuff, cuff 4
Has a length substantially equal to the entire length of the blood pressure monitor main body 3 during measurement.
Consisting of a bag body having a nozzle for sucking and discharging air supplied from the air, and a nozzle for a pressure sensor for detecting the pressure in the blood blocking bag. It acts to block arteries. Outer body 5
Is formed by sewing or welding the outer cloth 5a and the outer cloth 5b.
It acts to protect and contain

[0013] In the approximately one-third of the length of the cuff 4,
A clip plate 10 is provided. The inner surface of the clip plate 10 is slightly curved so as to follow the outer peripheral shape of the portion 1 to be measured. A hook 11 for connecting the cuff 4 and the sphygmomanometer main body 3 is provided on an outer surface of the clip plate 10, and the cuff 4 is attached to the sphygmomanometer main body 3 via the clip plate 10. One end of the cuff 4 is fixed to the sphygmomanometer main body 3 via a cuff storage section 6 a and a folding plate 12 described later. The other end of the cuff 4 is arranged along the inside of the folding plate 12. The folding plate 12 is composed of arc-shaped plates 12a and 12b and a flexible plate 12c, and the two arc-shaped plates 12a are connected via a rotating shaft 70 so as to be freely foldable by 180 °, and one of the circles 12a. The tip of the arc-shaped plate 12a is rotatably connected to the end of the cuff storage portion 6a via the rotation shaft 72, and the tip of the other arc-shaped plate 12a rotates to one end of the flexible plate 12c via the rotation shaft 71. They are freely connected. The other end 12 c ₁ of the flexible plate 12 c is screwed to the sphygmomanometer main body 3. Reference numeral 12d in the figure denotes a hook for detachably connecting the two arc plates 12a and 12b.

On the other hand, as shown in FIG. 2, the cuff storage portion 6a constitutes an expansion restricting means 6 for expanding the unwound portion 4b of the cuff 4 and restricting the expansion to a fixed amount. The cuff storage portion 6a is formed in a box shape including an inner plate 14 formed in a curved shape in accordance with the outer peripheral shape of the measured portion 1 and an outer plate 15 formed in the same bending ratio as the inner plate 14. A cavity 6b is formed in the inside of the cuff 4 so that the unwound portion 4b of the cuff 4 can be freely taken in and out. An opening 6c is provided at one end of the cavity 6b so that the cuff 4 can be freely taken in and out, and the tip of the cuff 4 is prevented from coming off. The cavity 6b has a uniform thickness d over the entire length, and the thickness d is such that the expansion amount of the portion 4a wound around the measured portion 1 of the cuff 4 and the expansion amount of the unwound portion 4b are substantially the same. It is set to be. The width of the cuff storage section 6a (the dimension in the direction perpendicular to the paper surface of FIG. 1) is determined in consideration of the case where the cuff 4 is contracted and stored in a small loop shape (FIG. 1). (The dimension in the direction perpendicular to the plane of the drawing) is preferably equal to or less than the above.

Here, as shown in FIG. 4, the cuff storage portion 6a has a curvature N in a range N of about 1/2 in the length direction within a range M of the measured portion 1 with which the cuff storage portion 6a contacts. It is desirable to set it equal to the average curvature Ra. FIG. 5 (a)
Occupies about half of the length of the cuff storage section 6a in the cuff storage section 6a.
a shows a case where the arcuate surface 50 having the same curvature Ra as the average curvature Ra of the measured portion 1 to be contacted with, and the other half formed by the arcuate surface 51 having the curvature Rb larger than the curvature Ra. FIG. 5B shows a case where the entire length of the cuff storage portion 6a is formed by an arc surface 50 having the same curvature Ra as the average curvature of the measured portion 1 in contact with the cuff storage portion 6a. In FIG. 5A, it is desirable that the boundary between the arc surfaces 50 and 51 having different curvatures Ra and Rb be continuous so that a slide button 18 described later can be smoothly moved. In addition, on the arc surface 51 having the curvature Rb larger than the average curvature of the measured portion 1, the slide width of the slide button 18 constituting the length adjustment mechanism 7 can be sufficiently ensured, and FIG. It is desirable that the curvature is set so as to satisfy the condition that the entire width h ₁ (<h ₂ ) of the sphygmomanometer 2 including the cuff storage portion 6a can be reduced as much as possible when the cuff 4 is stored. Of course, cuff storage 6a
Is not limited to the embodiment shown in FIGS.

As shown in FIG. 3, the cuff storage portion 6a also serves as a storage case when storing the cuff 4.
In other words, a hook 17 is provided which can be hooked from one end of the outer plate 15 of the cuff housing 6a to a shaft 16 provided at a side end of the sphygmomanometer main body 3. The cuff 4 can be compactly stored between the sphygmomanometer main body 3 and the cuff storage section 6a by being hooked on the section 16.

Further, in the cuff storage section 6a, a length adjusting mechanism 7 for adjusting the length of the cuff 4 in accordance with the circumferential length of the part 1 to be measured, and the cuff 4 by the length adjusting mechanism 7 A lock mechanism 8 that locks with the adjusted length is provided. In the present embodiment, the length adjustment mechanism 7 includes a slide button 18 housed in the cavity 6b between the inner plate 14 and the outer plate 15.

As shown in FIG. 6, the front end 19 of the cuff 4 is attached to the slide button 18, and the slide button 18 slides along a long hole for the slide button 18 formed along the length direction of the outer plate 15. The slide unit 20 includes a free slide unit 20 and a lock unit 21 rotatably fitted to and held by the slide unit 20. At one end of the lock portion 21, the inner plate 1
A lock piece 22 that can be locked is provided in any of a plurality of lock holes 23 formed at intervals in the length direction of the lock 4, and a pressing operation section 21 a is provided at the other end of the lock section 21. I have. The lock portion 21 is normally given a rotational force in the direction of arrow A in FIG. 6A by a holding piece 24 provided on the slide portion 20, whereby the lock piece 2 is rotated.
Reference numeral 2 is fitted in one of the lock holes 23 to restrict the slide of the slide portion 20. In addition, the lock unit 21
By pressing the pressing operation portion 21a of the
6B, the lock piece 22 comes off the lock hole 23 by rotating in the arrow direction B of FIG. 6B, whereby the cuff 4 is slidable.

Next, the operation will be described. First, by opening the folding plate 12 as shown in FIG. 1, the loop of the cuff 4 is maximized, and for example, it becomes easy to pass a human arm through the cuff 4. Thereafter, when the folding plate 12 is folded, the loop of the cuff 4 becomes slightly smaller. At this stage, the measurement site 1 is not yet pressed by the cuff 4. afterwards,
The slide button 18 is slid in a direction to tighten one end of the cuff 4. That is, when the pressing operation portion 21a is pressed, the lock piece 22 is disengaged from the lock hole 23 and the slide button 18 becomes slidable, and one end of the cuff 4 is drawn into the cuff storage portion 6a to cover the loop of the cuff 4. The size can be reduced to the extent that the measurement site 1 is pressed (the state of FIG. 2). Thereafter, when the pressing of the pressing operation portion 21a is released, the lock piece 22 is engaged with one of the lock holes 23 by the holding piece 24, and the slide button 18 is locked at that position.

With the cuff 4 pressed against the outer peripheral surface of the measurement site 1 as described above, air is supplied from the sphygmomanometer main body 3 to the blood cuff 4 in the cuff 4 to inflate the blood cuff 4 so that the measurement site 1 is inflated. By compressing, the artery is blocked and the blood pressure can be measured. At this time, the unwound portion 4b remaining without being wound around the measured portion 1 of the cuff 4 is replaced with the cavity 6b in the cuff storage portion 6a.
When the air is sent into the blood bag, the air is supplied not only to the part 4a wound around the site 1 to be measured but also to the unwound part 4b so that the unwound part 4b is supplied.
Can expand, and the expansion of the unwound portion 4b is limited to a certain amount by the thickness d of the cavity 6b. In other words, instead of folding the unwound portion of the cuff in a state in which it cannot be expanded by the reversing ring as in the prior art, in the present invention, the unwound portion 4b can expand by the thickness d of the cavity 6b of the cuff storage portion 6a and the cavity 6b Is limited by the thickness d or more, so that the inflation amount of the blood bag is substantially equal over the entire length of the cuff 4. Therefore, even if the length of the measurement site 1 in the circumferential direction changes and the length of the unrolled portion 4b changes, the air volume contained in the blood cuff 4 of the cuff 4 hardly changes at the time of measurement. This has no effect on the evacuation characteristics of the cuff 4 during use, and as a result, it is possible to improve the measurement accuracy by keeping the air volume in the blood bag substantially constant during use.

After measuring the blood pressure, the slide button 1
As shown in FIG. 3, the cuff 4 is folded into a small loop, and the hook 17 provided at one end of the cuff housing 6a is hooked on the shaft 17 of the sphygmomanometer main body 3 as shown in FIG.
Can be stored compactly, and the cuff storage section 6a can also serve as a storage case, so that a dedicated storage case is not required, and the number of parts can be reduced and cost can be reduced. In addition, the cuff storage section 6a is fixed to the cuff 4 at the time of measurement, while the cuff storage section 6a is fixed to the sphygmomanometer main body 3 when storing the cuff 4, so that the cuff storage section 6a does not interfere with measurement or after use. Usability is further improved, and the cuff 4 can be sufficiently protected.

In this embodiment, the expansion restricting means 6 is
The unwound portion 4b of the cuff 4 is formed in a box shape that can be stored in an expanded state, and the thickness d of the cavity 6b is made substantially constant over its entire length. By setting the amount of expansion of the wound portion 4a and the amount of expansion of the unwound portion 4b to be substantially the same, the air volume entering the blood bag is hardly changed, and the measurement accuracy is further improved. be able to.

Further, by providing the slide button 18 for adjusting the length of the cuff 4 in accordance with the circumferential length of the portion 1 to be measured, the length of the cuff 4 can be adjusted when the cuff 4 is not used. As a result, since the lock mechanism 8 is provided on the length adjustment mechanism 7, once the length of the cuff 4 is adjusted, the state can be easily maintained, and the next time. There is no need to readjust when measuring.
Further, by locking the cuff 4, a direction in which the length of the cuff 4 wrapped around the measurement site 1 becomes longer when air flows into the blood bag during measurement (a direction away from the measurement site 1). However, the cuff 4 is locked as described above, so that the winding length of the cuff 4 hardly changes. That is, as the winding length of the cuff 4 increases, the amount of air to be introduced into the cuff 4 needs to be increased accordingly. However, the need for the lock mechanism 8 is eliminated, and useless air expansion can be prevented.

Further, since the cuff storing portion 6a is formed in a curved shape in accordance with the outer peripheral shape of the measured portion 1, the cuff storing portion 6a has a shape along the outer circumference of the measured portion 1 at the time of measurement. 6a can be saved in space. In addition, if the cuff storage section 6a is constituted by an arc surface 50 having the same curvature Ra as the average curvature Ra of the measured portion 1, and an arc surface 51 having a curvature Rb larger than the curvature Ra, an arc having a large curvature Rb is obtained. The width h _{2 of the} entire sphygmomanometer 2 including the cuff storage portion 6a when the cuff 4 is stored while the slide width of the slide button 18 is sufficiently secured by the surface 51 (see FIG. 5).
H ₁₎ a by reducing an advantage that it can reduce the size of (b).

FIG. 7A shows another embodiment.
In this embodiment, in place of the cuff storage portion 6a, the elasticity of the jacket 5 in the unwound portion 4b of the cuff 4 is made smaller than the elasticity of the jacket 5 in other portions of the cuff 4. Things. For example, the portion wound around the measured portion 1 of the jacket 5 is formed of a stretchable fabric, and the unwound portion 4b of the jacket 5 is formed of a non-stretchable fabric. Even without providing the cuff storage portion 6a as in the embodiment, similarly to the embodiment of FIG. 1, the unwound portion 4b remaining without being wound around the measured portion 1 of the cuff 4 can be inflated with air, and the inflation is reduced. It can be limited to a certain amount, the air volume in the cuff 4 at the time of use can be kept substantially constant without being affected by the circumferential length of the measured portion 1, and the measurement accuracy can be improved. The effect of being able to obtain is obtained. In FIG. 7A, the cuff 4 can be fastened with a fastener such as a fastener, so that the folding plate 12 of the embodiment of FIG. 1 can be omitted, and the structure can be further simplified. it can.

As shown in FIG. 7 (a), instead of lowering the elasticity of the jacket 5 as shown in FIG. 7 (a), the cuff 4 has a lower unwound portion 4b. Elastic material 30
May be stuck. By attaching the low elastic material 30 having lower elasticity than the outer cover 5 to the surface of the unwound portion 4b of the outer cover 5, the measured portion of the cuff 4 can be measured similarly to FIG. The effect that the unwound part 4b remaining without being wound around 1 can be expanded with air and the expansion can be limited to a certain amount is obtained.

Further, instead of sticking the low elastic material 30 on the surface of the unwound portion 4b of the jacket 5 as shown in FIG. 7 (b), as shown in FIG. 4b
A case 9 for suppressing the inflation of the cuff 4 may be placed on the outer casing 5 of the above. Other configurations are the same as those in the embodiment of FIG. This case 9 is formed in the shape of a flat box having one open side, and its thickness d is such that the expansion amount of the portion 4a wound around the measured portion 1 of the cuff 4 and the expansion amount of the unwound portion 4b are substantially the same. It is set to be. Therefore, the expansion of the unwound portion 4b of the cuff 4 can be suppressed by the case 9, and the expansion can be limited to a certain amount.
The air volume in the blood bag during use can be kept substantially constant without being affected by the circumferential length of the measurement site 1;
The effect that the measurement accuracy can be improved is obtained, and the effect that the structure of the cuff 4 can be simplified by using the case 9 that is a separate component from the cuff 4 is also obtained.

[0028]

As described above, according to the first aspect of the present invention, the cuff is wound and inflated with air in accordance with the circumferential length of the measured portion to compress the measured portion. Therefore, the blood pressure monitor for measuring blood pressure is provided with inflation limiting means for allowing the unwound portion of the cuff remaining unwound to the measurement site to be inflatable with air and for limiting the inflation to a fixed amount. The air can be fed into the unwound portion of the cuff, and the expansion of the unwound portion is limited to a certain amount by the expansion limiting means, so that the inflation amount becomes substantially equal over the entire length of the cuff. Therefore, even if the length of the measured portion in the circumferential direction changes and the length of the unrolled portion changes,
The air volume contained in the blood cuff of the cuff at the time of compression will be kept substantially constant, and the air volume will hardly change.Therefore, there will be no effect on the exhaust characteristics of the cuff during use. The air volume in the blood bag during use can be kept substantially constant without being affected by the circumferential length, and the measurement accuracy can be improved.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the expansion limiting means is formed in a box shape in which the unwound portion of the cuff can be freely retracted and stored. By storing the unwound part in a box, the air volume in the blood bag during use can be kept substantially constant without being affected by the circumferential length of the part to be measured. Can be improved.

According to the third aspect of the present invention, in addition to the effect of the second aspect, the thickness of the cavity in the box is made substantially constant over its entire length, so that the volume of air entering the blood bag is not changed. , Measurement accuracy is improved. According to the fourth aspect of the present invention, in addition to the effect of the second or third aspect, the thickness of the cavity in the box shape is increased by the amount of expansion of the portion wound around the measured portion of the cuff and the unrolled portion. Since the inflation amount is set to be substantially the same value, the volume of air entering the blood bag is not further changed, and the measurement accuracy can be further improved.

According to a fifth aspect of the present invention, in addition to the effect of the first or second aspect, the length of the cuff is adjusted by the expansion limiting means in accordance with the circumferential length of the portion to be measured. Since the length adjusting mechanism is provided, the cuff can be easily pressed against the measurement site, and when the cuff is not used, the length of the cuff can be adjusted to reduce the size of the blood pressure monitor as a whole.

According to the sixth aspect of the present invention, in addition to the effects of the first and second aspects, the expansion limiting means can be fixed to the cuff or the main body of the sphygmomanometer. By fixing and fixing the expansion limiting means to the main body of the sphygmomanometer after use, the cuff storage portion does not become an obstacle during measurement or after use, and the storage property can be improved. According to the seventh aspect of the present invention, in addition to the effect of the first or second aspect, the expansion limiting means is formed in a curved shape in accordance with the outer peripheral shape of the measured part. Can be easily conformed to the outer peripheral shape, and the space for the expansion restricting means can be saved.

According to the eighth aspect of the present invention, in addition to the effect of the seventh aspect, since the curved portion is constituted by a plurality of arc surfaces having different curvatures, the expansion limiting means can be made compact. Thus, the entire blood pressure monitor including the expansion restricting means can be reduced in size. The invention according to claim 9 is
In addition to the effects of claim 1 or claim 2, the expansion restricting means also serves as a storage case when the cuff is contracted and stored, so that the number of parts can be reduced and the storage performance can be improved. Yes, and the cuff will be well protected.

According to a tenth aspect of the present invention, in addition to the effect of the fifth aspect, the length adjusting mechanism is provided with a lock mechanism for locking the cuff at the adjusted length. Once adjusted, the state can be easily maintained, eliminating the need to readjust for the next measurement. In addition, when air flows into the blood bag during measurement, air force acts on the cuff in a direction in which the wrap length around the measurement site becomes longer (in a direction away from the measurement site). By locking the cuff as described above, the winding length of the cuff hardly changes. That is, as the wrapping length of the blood bag increases, it is necessary to increase the amount of air to be put into the cuff. However, the need for the lock mechanism is eliminated, and unnecessary air expansion can be prevented.

According to the eleventh aspect of the present invention, in addition to the effect of the first aspect, the elasticity of the jacket at the unwound portion of the cuff is reduced as compared with the elasticity of the jacket at the other portion of the cuff. Since the expansion restricting means is configured as described above, the structure of the expansion restricting means can be simplified. According to the twelfth aspect of the present invention, in addition to the effect of the eleventh aspect, the low-stretch material is attached to the outer cover of the cuff unrolled portion to constitute the expansion limiting means. The structure can be further simplified.

According to a thirteenth aspect of the present invention, in addition to the effect of the first aspect, the expansion restricting means is provided in a case for covering the cuff remaining portion of the cuff to prevent expansion of the cuff. Therefore, the expansion of the unrolled portion of the cuff can be suppressed by the case, and the expansion can be limited to a certain amount, and therefore, when the cuff is used without being affected by the circumferential length of the portion to be measured. The air volume in the blood bag can be kept substantially constant, and the measurement accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram at the time of measurement of the above.

FIG. 3 is an explanatory view when the above is stored.

FIG. 4 is an explanatory diagram of a curved shape of the cuff storage unit according to the first embodiment.

FIG. 5A is an explanatory diagram in a case where the cuff storage portion is formed by an arc surface having a different curvature, and FIG. 5B is an explanatory diagram in a case where the cuff storage portion is formed by an arc surface having a uniform curvature.

FIGS. 6A and 6B are cross-sectional views illustrating an operation state of a slide button.

FIG. 7A is an explanatory diagram of another embodiment, and FIG. 7B is an explanatory diagram of still another embodiment.

FIG. 8A is an explanatory view of still another embodiment, and FIG. 8B is a perspective view of a case.

FIGS. 9A and 9B are explanatory diagrams of a conventional blood pressure monitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measurement part 2 Sphygmomanometer 3 Sphygmomanometer main body 4 Cuff 4a The part wound around the measurement part 4b Unwound part 5 Outer body 6 Expansion restriction means 6b Cavity 7 Length adjustment mechanism 8 Lock mechanism 9 Case 30 Low elasticity Material 50,51 Arc surface d Cavity thickness

Claims (13)

[Claims] 1. A sphygmomanometer that measures a blood pressure by wrapping a cuff according to the circumferential length of a measured portion and inflating with air to compress the measured portion without being wound around the measured portion. A sphygmomanometer characterized in that it comprises an inflation limiting means for allowing the remaining cuff unrolled portion to be inflatable with air and for limiting the inflation to a certain amount. 2. The sphygmomanometer according to claim 1, wherein the inflation restricting means is formed in a box shape in which an unwound portion of the cuff can be freely taken in and out. 3. A sphygmomanometer according to claim 2, wherein the thickness of the cavity in the box is substantially constant over its entire length. 4. The thickness of the cavity in the box is set so that the expansion amount of the portion wound around the measured portion of the cuff and the expansion amount of the unwound portion are substantially the same. The blood pressure monitor according to claim 2 or 3, wherein 5. The expansion restricting means according to claim 1, further comprising a length adjusting mechanism for adjusting the length of the cuff according to the circumferential length of the portion to be measured. Sphygmomanometer. 6. The sphygmomanometer according to claim 1, wherein the expansion restricting means can be fixed to the cuff or the sphygmomanometer main body. 7. The sphygmomanometer according to claim 1, wherein the expansion restricting means is formed in a curved shape so as to conform to the outer peripheral shape of the part to be measured. 8. The sphygmomanometer according to claim 7, wherein the curved portion is formed by a plurality of arc surfaces having different curvatures. 9. The sphygmomanometer according to claim 1, wherein the expansion restricting means also functions as a storage case when the cuff is contracted and stored. 10. The sphygmomanometer according to claim 5, wherein a lock mechanism that locks the cuff with the adjusted length is provided in the length adjustment mechanism. 11. The expansion restricting means according to claim 1, wherein the expansion and contraction of the jacket at the remaining portion of the cuff is made smaller than the expansion and contraction of the jacket at the other portion of the cuff.
Sphygmomanometer as described. 12. The sphygmomanometer according to claim 11, wherein a low-stretch material is adhered to the outer cover of the cuff unrolled portion to constitute the expansion restricting means. 13. The sphygmomanometer according to claim 1, wherein the inflation restricting means comprises a case for covering the cuff unrolled portion on the outer cover to suppress the inflation of the cuff.