JP2004223103A - Tourniquet for measuring blood pressure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the hose of a tourniquet for measuring blood pressure suitably suppressed from the occurrence of noise caused by the friction of the tourniquet with a mat coming into contact with the tourniquet even during handling or operation similar to that of a conventional hose. <P>SOLUTION: A slide sheet 66, which is obtained by superposing a pair of sheet members 66a and 66b one upon another in a mutually slidable manner, is provided to a part, where the load of a part 58 of a living body is applied, of the peripheral surface of the tourinquet 10 mounted on a part 58 of the living body in such a posture that the sliding direction of the sheet members becomes the width direction of the tourniquet 10. Accordingly, even if the relative movement between the tourniquet 10 and the mat 64 coming into contact with the turniquet 10 is caused during the oppression to the part 58 of the living body due to the tourniquet 10, the pair of the sheet members 66a and 66b superposed on upon another in order to constitute the slide sheet 66 mutually slide smoothly and the occurrence of noise caused by the relative movement between the tourniquet 10 and the mat 64 is suppressed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a compression band for measuring blood pressure, which is wound in a cylindrical shape to compress a part of a living body when measuring blood pressure.
[0002]
[Prior art]
2. Description of the Related Art A pressure cuff for blood pressure measurement is known which includes an inflatable inflation bag and is wound around a part of a living body, for example, an upper arm, an ankle, or the like in a cylindrical shape to compress a part of the living body when measuring blood pressure. ing. Such a compression band is constituted by accommodating an inflatable bag connected to a hose in a band-like base made of, for example, a two-folded nylon resin cloth, or a two-folded vinyl resin sheet. A hermetic inflatable bag is integrally provided on a part of the inside of a belt-shaped base member by high frequency welding. For example, a compression band for blood pressure measurement disclosed in Patent Document 1 is such. The inflation bag of the compression band for blood pressure measurement is inflated by, for example, being wound around the upper arm of a living body and then inflated by supplying a pressurized gas through a hose connected thereto, or before the inflation. The blood pressure is determined based on a change in the magnitude of the pulse wave signal generated in synchronization with the heartbeat in the process of gradually changing the pressure.
[0003]
[Patent Document 1] JP-A-61-130205 [Patent Document 2] JP-A-62-170002 [Patent Document 3] JP-A-63-056004
[Problems to be solved by the invention]
By the way, when the compression band is wrapped around the patient's upper arm or ankle during blood pressure measurement, for example, when the patient is in a sleeping posture, a part of the compression band is placed on a bed mat. , And a state in which a part of the load of the patient around which the compression band is wound is supported. However, in such a state, slippage occurs between the compression band and the mat of the bed in contact with the compression band due to the patient's own movement, the movement of the compression band relative to the patient accompanying the increase of the compression pressure, and the slippage. Accordingly, there is a problem that the noise generated by the noise mixes into the pulse wave signal for blood pressure measurement, and the blood pressure measurement becomes abnormal or the blood pressure measurement accuracy is impaired.
[0005]
On the other hand, as shown in Patent Document 1, it is possible to use a pair of pillows for lifting a part of the living body on both sides of the compression band so as to float the compression band wound around a part of the living body. Although it has been proposed, preparing and using or storing such a pillow with a compression band is not only complicated, but also has a problem that it is easily lost.
[0006]
The present invention has been made in view of the above circumstances, and the purpose thereof is that noise generated by rubbing between the compression band and a mat or the like in contact therewith can be handled and operated in the same manner as before. An object of the present invention is to provide a compression band hose for blood pressure measurement that is suitably suppressed.
[0007]
[Means for Solving the Problems]
The gist of the present invention for achieving the above object is to have an inflatable inflatable bag, and to measure a blood pressure wound around a part of a living body to compress a part of the living body at the time of measuring blood pressure. A compression band, wherein a pair of sheet members are slidably overlapped with each other, and a sliding sheet is formed in such a manner that the sliding direction is the width direction of the compression band, and a part of the living body in the outer peripheral surface. In the portion where the load is applied.
[0008]
【The invention's effect】
According to this configuration, a sliding sheet in which a pair of sheet members are slidably overlapped with each other on a portion of the outer peripheral surface of the compression band where a load is applied to a part of the living body is moved in the sliding direction. Is provided in a posture in the width direction of the compression band, so that even when relative movement occurs between the compression band and a mat or the like in contact with the compression band during compression by the compression band, the compression band and the mat are in contact with the compression band. A pair of sheet members overlapped to form a sliding sheet interposed between the mat and the mat that slides smoothly with each other to suppress noise generation. In addition, the problem that not only the occurrence of the noise is suppressed but also the blood pressure measurement becomes abnormal or the blood pressure measurement accuracy is impaired due to the generation of the noise can be suitably solved.
[0009]
Other aspects of the invention
Here, preferably, the pair of sheet members overlapped to form the sliding sheet are formed of an endless annular sheet member. According to this configuration, since the pair of sheet members stacked to form the sliding sheet is formed of an endless annular sheet member, mutual sliding of the pair of sheet members is further smoothed.
[0010]
Preferably, the pair of sheet members forming the sliding sheet are formed of any one of a polypropylene resin, a polyethylene resin, and a silicone resin. With this configuration, since the sheet member is made of a material having a relatively low mutual friction coefficient, at the time of relative movement between the compression band and the mat or the like that comes into contact with the compression band, generation of noise is suitably suppressed. You.
[0011]
Preferably, the sliding sheet is mounted on the outer peripheral surface of the compression band via a mounting device having a mounting surface smaller than the dimension in the sliding direction. In this way, the sliding range of the sliding sheet can be reliably and sufficiently obtained.
[0012]
Preferably, the mounting device is configured by a planar fastener including a pair of detachable sheet-like fastener members. With this configuration, the sliding sheet is detachably provided on the outer peripheral surface of the compression band, so that the sliding sheet can be easily replaced.
[0013]
Preferably, the sliding sheet has a lubricant interposed between a pair of sheet members stacked to constitute the sliding sheet to reduce a mutual friction coefficient. With this configuration, the sliding between the sheet members constituting the sliding sheet is further facilitated, and the generation of noise is suitably suppressed. The lubricant may be, for example, a fluid such as silicone oil, glycerin, fats and oils, and high-viscosity polysaccharides; a powder such as talc; or a fluid such as silicon oil, glycerin, fats and oils, and high-viscosity polysaccharides; And a lubricating sheet impregnated with a lubricant such as a powder.
[0014]
Also, preferably, the sliding sheet is configured such that sheet members are closed to each other at an end in a direction perpendicular to the sliding direction. In this case, even if a lubricant for reducing the mutual friction coefficient is interposed between the pair of sheet members constituting the sliding sheet, the leakage of the lubricant is suitably prevented.
[0015]
Preferably, the sliding sheet is mounted on an outer peripheral surface of the compression band via a mounting device having a mounting surface smaller than a dimension orthogonal to the sliding direction. With this configuration, the restriction on mutual sliding between the pair of sheet members constituting the sliding sheet is eased, and the sliding is further facilitated.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0017]
FIG. 1 shows a configuration of a blood pressure measurement device 12 including a compression band 10 according to one embodiment of the present invention. In the figure, a pressure sensor 16 and an exhaust control valve 18 are connected to an inflation bag 14 of the compression band 10, and an air pump 22 is connected via a switching valve 20. The pressure sensor 16 detects the pressure in the inflatable bladder 14 and outputs a pressure signal SP representing the pressure. The exhaust control valve 18 functions as compression pressure control means, and controls the flow cross-sectional area to slowly or rapidly exhaust the air in the expansion bag 14. The switching valve 20 is an electromagnetic switching valve that is switched between a compression-side position and a suction-side position in order to function as a bag-part contracting unit. In the compression-side position, the inflation bag 14 of the compression band 10 is And the suction port of the air pump 22 is communicated with the atmosphere. At the suction side position, the expansion bag 14 of the compression band 10 is communicated with the suction port of the air pump 22 and the discharge port of the air pump 22 is connected to the atmosphere. To communicate with
[0018]
The low-pass filter 24 discriminates and outputs the cuff pressure signal SK indicating the compression pressure of the compression band 10 from the pressure signal SP output from the pressure sensor 16, and supplies the cuff pressure signal SK to the CPU 30 via the A / D converter 26. The band-pass filter 28 discriminates and outputs a pulse wave signal SM, which is a pressure vibration generated in synchronization with the heartbeat, from the pressure signal SP output from the pressure sensor 16, and outputs the signal through the A / D converter 26. To the CPU 30.
[0019]
The CPU 30, together with the ROM 32, the RAM 34, the interface 36, and the like, constitutes a microcomputer, that is, an arithmetic control circuit 37 functioning as blood pressure value determining means. The CPU 30 utilizes a storage function of the RAM 34 and stores programs stored in the ROM 32 in advance. , The blood pressure is determined according to an oscillometric algorithm, the display 38 displays the blood pressure value, and controls the exhaust control valve 18, the switching valve 20, and the air pump 22. The start signal MS from the start push button switch 40, the stop signal MT from the stop push button switch 42, and the start signal CS from the start signal generator 44 are supplied to the CPU 30. The activation signal generator 44 is selectively activated by a manual / auto switch 46. The activation signal generator 44 includes, for example, a well-known flip-flop circuit, and is configured to repeatedly generate the activation signal CS according to a preset period of several minutes to several tens of minutes by a setting device (not shown). It is configured.
[0020]
When the activation signal CS is supplied, the CPU 30 rapidly raises the compression pressure of the compression band 10 to a pressure increase target value set in advance higher than the systolic blood pressure value, and then obtains a pulse obtained in a process of gradually lowering the pressure. A blood pressure value is determined by an oscillometric method based on a change in wave amplitude. Further, when supplying the pressurized gas to the compression band 10 at the start of the blood pressure measurement, the CPU 30 determines that the pressure increase speed detected as the pressure of the compression band 10 is larger than a predetermined error determination value, If the speed is higher than the pressure increasing speed, it is determined that the pressure is abnormal and the blood pressure measurement is stopped.
[0021]
FIG. 2 is a diagram showing an outer peripheral surface in a state where the compression band 10 is developed on a plane, FIG. 3 is a diagram showing an inner peripheral surface in a state where the compression band 10 is developed on a plane, and FIG. 4 is a side view of the compression band 10. . As shown in FIGS. 2 to 4, the compression band 10 of the present embodiment has a flexible band shape such as a woven fabric woven from synthetic fibers, a synthetic resin sheet such as a soft vinyl chloride sheet or a nylon sheet. The inner peripheral side sheet member 52 of the same shape is joined to the outer peripheral side sheet member 50 at the outer peripheral edge thereof by a technique such as sewing, mounting agent, or high-frequency welding to form a longitudinal and bag-like shape. I have. The outer peripheral side sheet member 50 and the inner peripheral side sheet member 52 constitute a bag-shaped band-shaped base material.
[0022]
Inside one end of the compression band 10 in the longitudinal direction, there is provided a rectangular inflatable bladder 14 having a length approximately half of that of the compression band 10. In addition, the end portion 10a of the outer peripheral surface of the compression band 10 on the side of the inflatable bag 14 and the end portion 10b of the inner peripheral surface of the compression band 10 on the opposite side to the inflatable bag 14 have a large number of planted on the surface. A pair of fasteners constituting a surface fastener of a type detachably mounted by engaging a plurality of hook-shaped protrusions made of synthetic resin elastically deformable and implanted on the surface so as to engage with the loop-shaped fiber. Members 54 and 56 are respectively fixed. Since the pair of fastener members 54 and 56 are detachably attached to each other, the part of the living body 58 such as the upper arm or the ankle expands outside the portion 10a of the compression band 10 on the side of the expansion bag 14. The compression band 10 is wound in a cylindrical shape so that the portion 10b opposite to the bag 14 is overlapped.
[0023]
The inflatable bag 14 is airtightly formed of a relatively soft flexible or elastic member such as a vinyl chloride sheet or a natural or synthetic rubber sheet, and pressurized gas from the pump 22 is supplied to the inflatable bag 14. A flexible hose 60 to be supplied is connected to the widthwise side edge of the inflatable bladder 14. The hose 60 is an elastic tube made of an elastic material such as natural rubber or synthetic rubber, and a material having a relatively low rubber hardness is selected in consideration of contact with the skin of a living body. The hose 60 is connected to the blood pressure measurement device 12 via a connector 62. A tubular nipple integrally projecting from the connector 62 is fitted into one end of the hose 60 on the side opposite to the inflatable bag 14 by press-fitting, so that the hose 60 and the connector 62 are airtight. Interconnected.
[0024]
The outer peripheral surface of the compression band 10, particularly the outer peripheral surface of the compression band 10, is supported by a bed mat 64 shown in FIG. A sliding sheet 66 basically having a double structure is detachably attached to a portion to which is added via a mounting device 68. That is, in the present embodiment, the sliding sheet 66 is detachably attached to the outer peripheral surface of the compression band 10, in other words, to the portion 10 b of the outer peripheral side sheet member 50 opposite to the inflatable bag through the mounting device 68. ing.
[0025]
FIG. 5 is a diagram illustrating a structure for mounting the sliding sheet 66 on the compression band 10, and FIG. 6 is a perspective view illustrating the configuration of the sliding sheet 66. As shown in detail in FIGS. 5 and 6, the sliding sheet 66 is made of a material having a low coefficient of friction such as, for example, polypropylene resin, polyethylene resin, or silicone resin, or a pair of sheets that have been subjected to surface treatment such as moderate unevenness. The members 66a and 66b are formed by overlapping each other, and the sheet members 66a and 66b are a part of the endless annular sheet member on the compression band 10 side and the non-compression band 10 side. The sheet members 66a and 66b are mutually slid in the circumferential direction K of the endless annular sheet member, that is, in the direction K orthogonal to the opening direction A, in a state of being overlapped with each other. The sliding sheet 66 is detachably provided on the outer peripheral surface of the compression band 10 via a mounting device 68 in a posture in which the sliding direction K is the width direction of the compression band 10.
[0026]
The mounting device 68 is formed of, for example, a hook-and-loop fastener including a pair of fastener members 68a and 68b that are removably mounted to each other. The outer peripheral surface is fixed to the center in the width direction by sewing, welding, bonding, or the like. The mounting device 68 compresses the sheet members 66a and 66b so that the central portion of the sliding sheet 66 is detachably attached to the outer peripheral surface of the compression band 10 with a mounting surface smaller than the dimension of the sliding sheet 66 in the sliding direction K. The width dimension of the band 10 is set smaller than the dimension of the sliding sheet 66 in the sliding direction K. The value (= W ₁ −W ₂ ) obtained by subtracting the width direction dimension W ₂ of the compression band 10 of the sheet members 66 a and 66 b from the dimension W _{1 in} the sliding direction K of the sliding sheet 66 is the maximum sliding stroke of the sliding sheet 66. Have been.
[0027]
According to the compression band 10 configured as described above, as shown in FIG. 7, the portion of the outer peripheral surface of the compression band 10 attached to the part of the living body 58 to which the load of the part 58 of the living body is applied is applied. Since the sliding sheet 66, in which the pair of sheet members 66a and 66b are slidably overlapped with each other, is provided in a posture in which the sliding direction is the width direction of the compression band 10, the living body by the compression band 10 Even when relative movement occurs between the compression band 10 and the mat 64 or the like in contact with the compression band 10 during the compression of the part 58, the compression band 10 contacts the compression band 10 as shown by a solid line to a broken line in FIG. A pair of sheet members 66a and 66b overlapped to form a sliding sheet 66 interposed between the mat 64 and the mat 64 slides smoothly with each other, so that the compression band 10 and the mat 64 and the like can slide together. The generation of noise due to the relative movement of the cuff is suppressed, so even when handling and operating the cuff as usual, the generation of the noise is not only suppressed, but also the blood pressure measurement is abnormal due to the generation of the noise. Or the blood pressure measurement accuracy is impaired.
[0028]
Further, according to the present embodiment, the pair of sheet members 66a and 66b overlapped to form the sliding sheet 66 are constituted by endless annular sheet members, so that the pair of sheet members 66a and 66b 66b is made of a separate member, and the mutual sliding is smoother than that in which the ends are fixed to each other.
[0029]
Further, according to the present embodiment, the pair of sheet members 66a and 66b constituting the sliding sheet 66 have a relatively low mutual friction coefficient, such as any one of polypropylene resin, polyethylene resin, and silicone resin. Since it is made of a material, generation of noise is preferably suppressed during relative movement between the compression band 10 and the mat 64 or the like that comes into contact with the compression band 10.
[0030]
Further, according to this embodiment, the sliding sheet 66, through the mounting device 68 than the dimension W ₁ of the sliding direction K with a mounting surface of the small dimensions W _2, which is mounted on the outer peripheral surface of the cuff 10 Therefore, the sliding range of the sliding sheet 66 can be reliably and sufficiently obtained. Minus the width dimension _{W 2} of the sliding direction K cuff 10 from the dimension _{W 1} of the sheet members 66a and 66b of the sliding seat 66 ₍₌ W 1 -W ₂₎ is the maximum sliding stroke of the sliding sheet 66 It has been.
[0031]
Further, according to the present embodiment, since the mounting device 68 is constituted by a planar fastener comprising a pair of detachable sheet-like fastener members 68a and 68b, the sliding sheet 66 is provided on the outer peripheral surface of the compression band 10. Since it is provided detachably with respect to, replacement is easily performed.
[0032]
Next, another embodiment of the present invention will be described. In the following description, portions common to the above-described embodiment will be denoted by the same reference numerals and description thereof will be omitted.
[0033]
FIG. 9 is a sectional view illustrating a configuration example of a sliding sheet 66 according to another embodiment of the present invention, and FIG. 10 is a perspective view illustrating a configuration of the sliding sheet 66 with a part thereof cut away. 9 and 10, the sliding sheet 66 of this embodiment is made of a material having a low coefficient of friction such as, for example, polypropylene resin, polyethylene resin, or silicone resin, or a surface treatment such as moderate unevenness, as in the above-described embodiment. And a pair of sheet members 66a and 66b on which the compression band 10 and the non-compression band 10 of the endless annular sheet member are partly overlapped. is there. The sheet members 66a and 66b are mutually slid in the circumferential direction K of the endless annular sheet member, that is, in the direction K orthogonal to the opening direction A, in a state of being overlapped with each other. Both ends of the sliding sheet 66, which open in the direction A perpendicular to the sliding direction K, are closed in a liquid-tight or air-tight manner by welding, bonding, or the like, so that the sheet member 66a and the sheet member 66b, for example, fluids such as silicone oil, glycerin, oils and fats, and high-viscosity polysaccharides; powders such as talc; and fluids such as silicon oil, glycerin, oils and fats, and high-viscosity polysaccharides; A lubricating sheet 70 impregnated with a lubricant such as a powder is interposed.
[0034]
Mounting device 68 for detachably fixing the sliding sheet 66 to the outer peripheral surface of the cuff 10 is provided with a small dimension W ₄ than the dimension W ₃ in a direction A perpendicular to the sliding direction of the sliding sheet 66 Thus, the sliding sheet 66 can be easily slid in the sliding direction K even though both ends of the sliding sheet 66 that open in the direction A perpendicular to the sliding direction K are closed.
[0035]
According to the sliding sheet 66 of this embodiment, the following effects can be obtained in addition to the same effects as those of the above-described embodiment. That is, according to the sliding sheet 66 of the present embodiment, the lubricating sheet 70 impregnated with the lubricant for reducing the mutual friction coefficient is interposed between the pair of sheet members 66a and 66b constituting the sliding sheet 66. As a result, the sliding function of the sliding sheet 66 is further enhanced, and the generation of noise is suitably suppressed.
[0036]
Further, the sliding sheet 66 of the present embodiment has the sheet members 66a and 66b closed at both ends in the direction K orthogonal to the sliding direction A, so that the sheet member 66a and 66b Leakage of the lubricant interposed in the fin is suitably prevented.
[0037]
Further, the sliding sheet 66 of this embodiment, through the mounting device 68 having a small mounting surface than the dimension W ₃ in a direction A perpendicular to the sliding direction K, since it is mounted on the outer peripheral surface of the cuff 10, Restriction on mutual sliding between the pair of sheet members 66a and 66b due to the closing of the opening of the sliding sheet 66 is eased, and the sliding is further facilitated.
[0038]
As mentioned above, although one Example of this invention was described based on drawing, this invention is applied also to another aspect.
[0039]
For example, the compression band 10 of the above-described embodiment is attached not only to the ankle, but also to a part 58 of the living body in other parts such as the upper arm, and between the member supporting the load of the part 58 of the living body. With the sliding sheet 66 interposed therebetween, an effect of suppressing noise generation can be obtained.
[0040]
Further, in the above-described embodiment, the sliding sheet 66 is detachably attached to the outer peripheral surface of the compression band 10 via the attaching device 68, but may be non-detachably fixed.
[0041]
In the above-described embodiments of FIGS. 9 and 10, the lubricating sheet 70 impregnated with the lubricant is interposed between the pair of sheet members 66a and 66b constituting the sliding sheet 66. Fluids such as silicone oil, glycerin, oils and fats, and high-viscosity polysaccharides, and lubricants such as powders such as talc and graphite may be directly interposed.
[0042]
In addition, the compression band 10 of the above-described embodiment has a longitudinal shape that extends linearly. However, since the compression band 10 is attached to an upper arm, a thigh, an ankle, or the like, if necessary, the longitudinal shape is curved as a whole. It does not matter even if it is said.
[0043]
Although not enumerated one by one, the present invention can be variously modified without departing from the gist thereof.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a blood pressure measurement device to which a compression band according to an embodiment of the present invention is connected.
FIG. 2 is a diagram showing an outer peripheral surface in a state where the compression band of FIG. 1 is developed in a plane.
FIG. 3 is a diagram showing an inner peripheral surface in a state where the compression band of FIG. 1 is developed in a plane.
FIG. 4 is a side view showing a side surface of the compression band of FIG. 1;
5 is a view for explaining a mounting structure of a sliding sheet mounted on the outer peripheral surface of the compression band of FIG. 1, and is a sectional view taken along line VV of FIGS. 1 and 4. FIG.
FIG. 6 is a perspective view illustrating a configuration of a sliding sheet mounted on the outer peripheral surface of the compression band of FIG.
FIG. 7 is a diagram illustrating a use state of the compression band of FIG. 1;
FIG. 8 is a view for explaining a sliding operation of a sliding sheet provided on the compression band of FIG. 1;
FIG. 9 is a cross-sectional view illustrating a configuration of a sliding sheet according to another embodiment of the present invention.
FIG. 10 is a perspective view illustrating the configuration of the sliding sheet according to the embodiment of FIG.
[Explanation of symbols]
10: compression band 14: inflatable bag 66: sliding sheet 66a, 66b: sheet member 68: mounting device (plane fastener)
68a, 68b: fastener member 70: lubricating sheet

Claims (8)

It has an inflatable inflation bag, a pressure band for blood pressure measurement wound around a part of the living body to compress a part of the living body at the time of blood pressure measurement,
A sliding sheet, in which a pair of sheet members are slidably overlapped with each other, in a position where the sliding direction is the width direction of the compression band, and a portion of the outer peripheral surface to which a load of a part of the living body is applied. A cuff for measuring blood pressure, characterized in that the cuff is provided for: The compression band for blood pressure measurement according to claim 1, wherein the pair of sheet members stacked to form the sliding sheet are formed of an endless annular sheet member. The compression band for blood pressure measurement according to claim 1 or 2, wherein the pair of sheet members constituting the sliding sheet are made of any one of polypropylene resin, polyethylene resin, and silicone resin. The compression band for blood pressure measurement according to any one of claims 1 to 3, wherein the sliding sheet is mounted on an outer peripheral surface of the compression band via a mounting device having a mounting surface smaller than a dimension in the sliding direction. . 5. The compression band for blood pressure measurement according to claim 4, wherein the mounting device is configured by a planar fastener comprising a pair of detachable sheet-shaped fastener members. The sliding sheet according to any one of claims 1 to 5, wherein the sliding sheet has a lubricant interposed between a pair of sheet members stacked to constitute the sliding sheet to reduce a mutual friction coefficient. Compression band for blood pressure measurement. The compression band for blood pressure measurement according to any one of claims 1 to 6, wherein the sliding sheet has a sheet member closed at an end in a direction orthogonal to the sliding direction. The compression band for blood pressure measurement according to claim 7, wherein the sliding sheet is mounted on an outer peripheral surface of the compression band via a mounting device having a mounting surface smaller than a dimension orthogonal to a sliding direction of the sliding sheet. .

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