Bedsore prevention sheets

Abstract

To provide a bedsore prevention sheet capable of suppressing an occurrence of a hammock phenomenon and also suppressing skin inflammation caused by friction with a body.SOLUTION: A bedsore prevention sheet 1 which is used for a mattress 2 capable of dispersing body pressure, is a warp knitted fabric knitted by using warps to make stitches and stringing the stitches to each other, where an elongation rate thereof in vertical and horizontal directions measured in accordance with JIS L1096A method is 25% or more, a moisture absorption rate per unit area measured in accordance with Boken Standard BQE A 034 is 200 μg / cm2 min or less, and a moisture release rate per unit area is 200 μg / cm2 min or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a bedsore prevention sheet, and more particularly to a bedsore prevention sheet that is used with a specific mattress to prevent the formation of bedsores. [Background technology]

[0002] Preventing bedsores (bed sores) that develop in hospitalized patients who are forced to spend their time in bed has been a long-standing challenge in nursing care. The Japanese Society of Pressure Ulcers defines pressure ulcers as follows: "External forces applied to the body reduce or stop blood flow to the soft tissue between the bone and the surface of the skin. If this condition continues for a certain period of time, the tissue will suffer irreversible ischemic damage, resulting in a pressure ulcer."

[0003] As one method for preventing such bedsores, mattresses have been developed that have the ability to distribute the weight of the body when the body sinks down, thereby reducing body pressure, and these mattresses are currently available on the market.

[0004] Incidentally, mattresses are usually fitted with mattress sheets (hereinafter simply referred to as "sheets") from the standpoint of improving the feel on the skin, preventing the mattress from becoming soiled, and the like. Materials for such sheets include natural fibers such as cotton, linen, and silk, and synthetic fibers such as polyester, nylon, and acrylic. From the viewpoint of sweat absorption, however, woven fabrics made of natural fibers are mainly used.

[0005] However, normal sheets have the drawback of being poorly elastic. In particular, sheets made of woven fabrics made of natural fibers are extremely poorly elastic. For this reason, when a sheet is attached to a mattress and the body is tried to sink into it, as shown in Figure 6, the sheet 41 does not adequately follow the deformation of the mattress 42, and the body ends up in a state where it is suspended by the sheet 41 (hereinafter referred to as the "hammock phenomenon"). As a result, the contact area between the body and the mattress 42 is reduced, and the body pressure is not sufficiently distributed, and instead the body pressure may increase locally. In other words, the hammock phenomenon caused by the sheet 41 hinders the body pressure distribution effect of the mattress 42.

[0006] On the other hand, elastic sheets have been developed, although not with the aim of preventing bedsores. For example, a mattress sheet is known which has a sheet body formed from a woven fabric with poor elasticity and which has a surface portion which covers the entire upper surface of the mattress, and an elastic surface portion formed from an elastic material and sewn to the edges on both longitudinal ends of the sheet body (see, for example, Patent Documents 1 to 3). Also known is a sheet that includes a woven fabric portion that covers the upper surface of a rectangular bedding, and two stretchable portions that are made of stretchable members that cover the lower end surfaces of the bedding (see, for example, Patent Document 4). Also known is a bedding cover that encases a first bedding consisting of a mattress, futon, etc., and a second bedding for preventing bedsores that is placed on the first bedding, and is formed in a bag shape with an opening on the underside for accommodating the first and second bedding, and is provided with a pulling means for applying a pulling force to the periphery of the opening in a direction to reduce the size of the opening (see, for example, Patent Document 5). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Registered Utility Model No. 3202979 [Patent Document 2] JP 2013-52072 A [Patent Document 3] JP 2010-273828 A [Patent Document 4] Registered Utility Model No. 3226582 [Patent Document 5] Registered Utility Model No. 3079706 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0008] The sheets described in Patent Documents 1 to 5 above are elastic overall, and therefore can prevent the hammock phenomenon to some extent. However, the fabric in the areas that come into direct contact with the body has poor elasticity, and as the body sinks into the sheet, friction between the sheet and the body (clothing) can result in inflammation of the skin.

[0009] The present invention has been made in consideration of the above circumstances, and aims to provide a bedsore prevention sheet that can prevent bedsores by suppressing the occurrence of the hammock phenomenon and also suppressing inflammation of the skin caused by friction with the body. [Means for solving the problem]

[0010] The inventors conducted intensive research to solve the above-mentioned problems and discovered that the above-mentioned problems could be solved by using a warp knitted fabric as the fabric and setting its elongation, moisture absorption rate and moisture release rate within specific ranges, thereby completing the present invention.

[0011] The present invention is a bedsore prevention sheet for use in a mattress capable of dispersing body pressure, which is a warp knitted fabric made by forming stitches using warp yarns and knitting the stitches together. The stretch percentage in both the vertical and horizontal directions measured in accordance with the JIS L1096A method is 60~230% and The CPI of the warp knitted fabric is 40 to 200, the warp fineness is 11 to 220T, and the number of filaments in the warp is 200 or less; This is a bedsore prevention sheet with a moisture absorption rate per unit area of ​​200μg / cm2·min or less, and a moisture release rate per unit area of ​​200μg / cm2·min or less, measured in accordance with the VOKEN standard BQE A034.

[0012] It is preferable that the shear force of the bedsore prevention sheet of the present invention, as determined by the shear force evaluation method, is smaller than the shear force of a sheet woven with cotton yarn. Moreover, in the bedsore prevention sheet of the present invention, it is preferable that the frictional force measured by the frictional force evaluation method is smaller than the frictional force of a sheet woven with cotton yarn. Furthermore, in the bedsore prevention sheet of the present invention, it is preferable that the shear force is less than 1.5 N when measured by the shear force evaluation method, and the friction force is less than 68.2 N when measured by the friction force evaluation method.

[0013] In the bedsore prevention sheet of the present invention, the CPI of the warp knitted fabric is 65~85 The warp threads are 33~84 T, and the number of warp filaments is 12 to 48 bottles It is preferable that:

[0014] In the bedsore prevention sheet of the present invention, Tensile strength in both the vertical and horizontal directions measured according to JIS L1096A method is 200N or more It is preferable that

[0015] The bedsore prevention sheet of the present invention has a needle loop and a sinker loop. P Skin-contact surface The needle loop is disposed on the side that contacts the mattress, Sinker loop raw Knitted with yarn The needle loops are knitted with woolly yarn. It is preferable that the above-mentioned

[0016] In the bedsore prevention sheet of the present invention, the warp threads are preferably formed from a composite of polyethylene terephthalate resin and polytrimethylene terephthalate resin or polybutylene terephthalate resin.

[0017] In the bedsore prevention sheet of the present invention, The mattress has an evaluation value ratio of static pressure reduction under overload measured in accordance with JIS T9256-2 of 100% or less. It is preferable that:

[0018] It should be noted that, as long as it is in line with the object of the present invention, a configuration in which the above-mentioned items are appropriately combined can also be adopted. Effect of the Invention

[0019] The bedsore prevention sheet of the present invention employs a warp knitted fabric, which has better elasticity than conventionally used woven fabrics, and adjusts and knits the material, structure, etc. so that the elongation measured in accordance with JIS L1096A falls within the above-mentioned range, thereby making it possible to prevent the occurrence of the hammock phenomenon. In other words, when the bedsore prevention sheet is attached to a mattress and the body is allowed to sink into it, the bedsore prevention sheet can be made to follow the body as much as possible as it sinks into the mattress, and can also follow the body when the mattress is restored. Incidentally, if a circular knitted fabric or a weft knitted fabric were used for the sheets instead of a warp knitted fabric, the sheet would have a disadvantage that it would not be able to fully follow the restoration of the mattress after stretching due to its weak recovery force, and would be prone to wrinkling. Also, circular knitted fabrics or weft knitted fabrics have a disadvantage that they are prone to runs when snagged.

[0020] In addition, the bedsore prevention sheet is knitted by adjusting the material, structure, etc. so that the moisture absorption rate and moisture release rate per unit area measured in accordance with the Boken standard BQE A034 are within the above ranges, so that moisture such as sweat can be quickly absorbed and the moisture can be quickly released. As a result, inflammation of the skin due to friction with the body can be prevented. Since making the skin excessively humid is one of the factors that makes it easier to develop bedsores, the development of bedsores can be suppressed by adjusting the degree of humidification to be within a predetermined range. Therefore, a bedsore prevention sheet whose longitudinal and lateral elongation rates and moisture absorption and release rates are all within the above ranges does not impede the effect of dispersing body pressure provided by a body pressure distribution mattress, and can also suppress skin inflammation caused by friction with the body, thereby fully exerting its bedsore prevention effect.

[0021] In the bedsore prevention sheet of the present invention, the material, structure, etc. are adjusted and knitted so that the slippage force is smaller than that of cotton fabric, and this prevents the surface and inside of the skin from shifting from one another when lifting the back or moving the body, which is called "slipping." This makes it possible to more fully suppress inflammation of the skin.

[0022] In the bedsore prevention sheet of the present invention, the frictional force is adjusted and knitted so that it is smaller than that of cotton fabric, thereby reducing the friction between the bedsore prevention sheet and the body surface, and thus making it possible to more sufficiently suppress inflammation of the skin.

[0023] In the bedsore prevention sheet of the present invention, by setting the CPI of the warp knitted fabric, the warp fineness, and the number of filaments of the warp yarn within the above ranges, the above-mentioned elongation and shear force are maintained while the so-called pilling and snagging are unlikely to occur, resulting in excellent durability as a sheet.

[0024] In the bedsore prevention sheet of the present invention, the warp threads are made up of a first warp thread and a second warp thread, and by using unprocessed yarn as the first warp thread and woolly yarn as the second warp thread, the strength is improved and the feel is also excellent. At this time, by knitting so that the sinker loop side is the surface that comes into contact with the skin and the sinker loop serves as the first warp thread, the fabric will have a better feel against the skin.

[0025] In the bedsore prevention sheet of the present invention, a warp thread formed by combining polyethylene terephthalate resin with polytrimethylene terephthalate resin or polybutylene terephthalate resin is used, which not only provides sufficient elasticity and strength, but also provides excellent dimensional stability after washing.

[0026] In the bedsore prevention sheet of the present invention, recycled yarn is used as the yarn, thereby making it possible to sustainably reduce the environmental load. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view showing a bedsore prevention sheet according to this embodiment and a body pressure dispersion mattress to which the sheet is attached. [Diagram 2] FIG. 2(a) is a diagram showing the front side of the bedsore prevention sheet according to this embodiment, and (b) is an enlarged view of (a). [Diagram 3] FIG. 3 is an explanatory diagram for explaining the shear force evaluation method. [Figure 4] FIG. 4 is an explanatory diagram for explaining the frictional force evaluation method. [Diagram 5] 5(a) to (c) are diagrams showing the structure for producing the sample of this example. [Figure 6] FIG. 6 is an explanatory diagram for explaining the hammock phenomenon. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the illustrated ratios.

[0029] The bedsore prevention sheet according to the present invention is used by being laid on a mattress capable of dispersing body pressure (hereinafter referred to as a "body pressure dispersing mattress"). Specifically, the body pressure dispersion mattress preferably used here is one in which the evaluation value ratio of static body pressure reduction under overload, measured in accordance with JIS T9256-2, is 100% or less.

[0030] The size of the body pressure dispersion mattress may be any size, such as single size, semi-double size, double size, etc. The body pressure dispersion mattress may be for a bed, an electric bed (nursing bed), or a futon. The adjustable range (gatch up) of the back and legs of these beds is preferably 0 to 75 degrees for the back and 0 to 45 degrees for the knees. Examples of the inner material of the body pressure dispersion mattress include cotton, urethane foam, beads, sponge, three-dimensional net structures using resin, springs, palm fiber, air, water, etc. These may be used alone or in combination. Of these, it is preferable that the inner material of the body pressure dispersion mattress is at least one selected from the group consisting of cotton, urethane foam, beads, and three-dimensional net structures using resin. In this case, the inner material may be processed by making cuts or providing a concave-convex pattern. The body pressure dispersion mattress may have a multi-layer structure in order to improve the body pressure dispersion performance and bed conformability.

[0031] FIG. 1 is a perspective view showing a bedsore prevention sheet according to this embodiment and a body pressure dispersion mattress to which the sheet is attached. As shown in Fig. 1, the bedsore prevention sheet 1 according to this embodiment is a so-called flat sheet, and is intended to be laid on the upper surface of a body pressure-relieving mattress 2. In other words, the bedsore prevention sheet 1 is placed between the body and the body pressure-relieving mattress. The size of the bedsore prevention sheet 1 is not particularly limited, but it is preferable that the sheet is a size that can sufficiently cover the body pressure dispersion mattress. The bedsore prevention sheet 1 may be provided with attachment devices (not shown) such as rubber, hook-and-loop fasteners, buttons, etc., in appropriate positions for attaching the sheet to the body pressure dispersion mattress 2.

[0032] The bedsore prevention sheet 1 employs a warp knit fabric in which stitches are made using warp yarns and the stitches are knitted together in a continuous manner. Therefore, the bedsore prevention sheet 1 has superior elasticity compared to woven fabrics. On the other hand, compared to circular knitted fabrics or weft knitted fabrics, they are less stretchable but have better recovery after stretching. In addition, even if a snag occurs, runs are less likely to occur. For these reasons, the pressure ulcer prevention sheet 1, which is a warp knitted fabric, can conform adequately to the body pressure dispersion mattress, and may be able to suppress the hammock phenomenon.

[0033] The CPI of the warp knitted fabric of the bedsore prevention sheet 1 is preferably 20 to 200, more preferably 40 to 100, and even more preferably 60 to 85. Here, CPI is the number of courses per inch. If the CPI is less than 20 threads, the gaps will be larger when stretched compared to when the CPI is within the above range, which may result in sweat and other liquids passing through the bedsore prevention sheet 1 and penetrating into the pressure-relieving mattress.If the CPI is more than 200 threads, the resistance to stretching will be greater compared to when the CPI is within the above range, which may result in the sheet not conforming adequately to the pressure-relieving mattress.

[0034] The bedsore prevention sheet 1 preferably has a warp fineness of 11 to 220 T, more preferably 22 to 167 T, and even more preferably 33 to 56 T. The unit T is synonymous with decitex (dtex). If the warp fineness is less than 11T, fatigue failure may occur when stretched repeatedly, and pilling and snagging may be more likely to occur, compared to when the fineness is within the above range. If the warp fineness exceeds 220T, the weight will be greater than when the fineness is within the above range, and there is a disadvantage that handleability will be poor.

[0035] The bedsore prevention sheet 1 preferably has 200 or less warp filaments, more preferably 6 to 200 filaments, even more preferably 6 to 144 filaments, and even more preferably 12 to 48 filaments. If the number of warp filaments exceeds 200, the texture becomes too soft and pilling is more likely to occur, compared with a case where the number of filaments is within the above range. Furthermore, if the number of warp filaments is less than 12, the texture will be stiff and may feel unpleasant to the touch.

[0036] In the bedsore prevention sheet 1, by adjusting the CPI, fineness, and filament count as described above to all be within the above ranges, it is possible for the sheet to fully function as a highly durable sheet even though it is a warp knitted fabric. In particular, in the bedsore prevention sheet 1, when the CPI of the warp knitted fabric is 60-85, it is preferable that the fineness is 33-84T and the number of filaments is 12-48.

[0037] The bedsore prevention sheet 1 according to this embodiment is knitted using two reeds. Therefore, the bedsore prevention sheet 1 can be knitted using different types of warp threads for each reed. By knitting using different types of warp threads, the bedsore prevention sheet 1 has characteristics based on each warp thread. Specifically, in the bedsore prevention sheet 1, unprocessed yarn is used as the first warp yarn, and woolly yarn is used as the second warp yarn. Each of these is then placed on a separate reed and warp knitted.

[0038] Here, the unprocessed yarn in the first warp yarn refers to a yarn produced by bundling filaments without any special processing. On the other hand, the woolly yarn in the second warp refers to a yarn produced by bundling filaments and false twisting them with a false twisting machine or the like. In this way, in the bedsore prevention sheet 1, unprocessed yarn is used as the first warp thread and woolly yarn is used as the second warp thread, so that it has an excellent balance of elasticity and texture.

[0039] FIG. 2(a) is a diagram showing the front side of the bedsore prevention sheet according to this embodiment, and (b) is an enlarged view of (a). As shown in (a) and (b) of Fig. 2, the bedsore prevention sheet 1 has sinker loops 1a knitted using one reed and needle loops 1b knitted using the other reed. In Fig. 2 (a) and (b), for the sake of convenience, the sinker loops 1a are shown in color and the needle loops 1b are shown in white. The bedsore prevention sheet 1 is arranged so that the sinker loop 1a on the front side is the surface that comes into contact with the skin, and the needle loop 1b on the back side is the surface that comes into contact with the body pressure dispersion mattress.

[0040] The bedsore prevention sheet 1 is knitted so that the sinker loops 1a serve as first warp threads, and the needle loops 1b serve as second warp threads. That is, in the bedsore prevention sheet 1, the sinker loop 1a on the surface that comes into contact with the skin is made of the first warp yarn, which is an unprocessed yarn, thereby providing an excellent feel against the skin. Furthermore, when the body sinks into the bedsore prevention sheet 1, the sheet becomes V-shaped when viewed from the side. Therefore, by making the needle loops 1b on the side that comes into contact with the pressure-relieving mattress, which requires greater elasticity, the second warp thread is wooly yarn, the elasticity of the bedsore prevention sheet 1 is ensured and it also has excellent conformability to the pressure-relieving mattress.

[0041] In the bedsore prevention sheet 1, the material of the warp threads (first warp threads and second warp threads) is not particularly limited, but it is preferable to use those formed from synthetic resins such as polyacrylic resin, nylon resin, polyester resin, polyurethane resin, etc. Among these, from the viewpoint of washing fastness, it is preferable that the material is formed from polyester resin, and from the viewpoints of elasticity, strength and washing fastness, it is more preferable that the material is formed by combining polyethylene terephthalate resin (PET) with polytrimethylene terephthalate resin (PTT) or polybutylene terephthalate resin (PBT). In addition, it is preferable that the warp yarn is a recycled yarn, which can reduce the environmental load in a sustainable manner.

[0042] The pressure ulcer prevention sheet 1 has an elongation percentage in both the vertical and horizontal directions, measured in accordance with JIS L1096A, of 25% or more, preferably 25 to 230%, more preferably 25 to 160%, and even more preferably 60 to 140%. The vertical and horizontal elongation percentages may be the same or different. If the stretch rate is less than 25%, the hammock phenomenon may occur. If the stretch rate exceeds 230%, it may not be able to fully follow the recovery of the mattress. Also, if the stretch rate exceeds 160%, it has the disadvantage of being prone to shrinkage when washed. Moreover, it is preferable that the stretch rate in the horizontal direction is greater than that in the vertical direction. Generally, movements during sleep (turning over, etc.) are made in the horizontal direction, so by making the stretch rate in the horizontal direction greater than that in the vertical direction, the vertical and horizontal stretch rates can be balanced within a range of stretch rates in which the hammock phenomenon is unlikely to occur.

[0043] Here, the "shear force evaluation method" will be described. FIG. 3 is an explanatory diagram for explaining the shear force evaluation method. In this specification, the so-called "slip" means that, for example, as shown in FIG. 3, when lifting the back, the weight of the subject 11 (64 kg) is applied downward, whereas when the upper body is raised, an upward force is applied by the sheet or the like, resulting in the application of alternating slip forces between the surface of the skin and inside the skin. In the "shear force evaluation method," a multi-axis force sensor (not shown) is attached to the shoulder blades of the back of subject 11, who is then laid supine on sheet 12 to be evaluated. Subject 11 is then raised using electric bed 13 from a supine position (θ=0 degrees) to a position of θ=75 degrees at a constant speed over a period of approximately 23 seconds. The change in pressure value output by the multi-axis force sensor becomes the value of the "shear force." That is, the slippage force of the sheet 12 to be evaluated is measured by the slippage force evaluation method.

[0044] As the multi-axis force sensor, for example, a three-axis type Shock Chip T40 (manufactured by Touchence Inc.) can be used. In addition, the electric bed 13 may be any commercially available one that has a back-raising function, and may or may not have a knee-raising function, height adjustment function, etc. For example, the electric bed 13 may be Metis (registered trademark) (manufactured by Paramount Bed Co., Ltd.). As the mattress of the electric bed 13, the above-mentioned body pressure dispersion mattress is used. The amount of change in pressure value is the difference between the maximum and minimum pressure values ​​that are output.

[0045] The bedsore prevention sheet 1 is knitted by adjusting the material, structure, etc. so that its slippage force is smaller than that of a sheet woven with cotton yarn. This makes it possible to sufficiently suppress inflammation of the skin. Furthermore, if the slippage force of a sheet woven from cotton yarn is taken as 1, the slippage force of the bedsore prevention sheet 1 is preferably 0.8 or less, more preferably 0.55 or less, in relative ratio. More specifically, the shear force of the bedsore prevention sheet 1 is preferably less than 1.5 N, more preferably 1.2 N or less, and even more preferably 0.825 N or less.

[0046] By setting the shear force of the bedsore prevention sheet 1 within the above range, the effect of dispersing body pressure by the body pressure dispersion mattress is not hindered, and the bedsore prevention effect can be fully exerted. At the same time, inflammation of the skin caused by friction with the body can also be suppressed.

[0047] The bedsore prevention sheet 1 preferably has a tensile strength in both the vertical and horizontal directions, measured in accordance with JIS L1096A, of 200 N or more, and more preferably 200 to 600 N. The tensile strength in the vertical direction and the tensile strength in the horizontal direction may be the same value or different values. If the tensile strength is less than 200 N, there is a risk of breakage due to expansion and contraction fatigue, etc., compared to when the tensile strength is within the above range.

[0048] Here, the "friction force evaluation method" (static friction) will be described. FIG. 4 is an explanatory diagram for explaining the frictional force evaluation method. The "friction force" in this specification is different from the shear force described above, and is a superficial force that does not take into account the inside of the skin. However, in order to be closer to reality, a subject wearing clothes is assumed, and the force generated by friction between the subject and the sheet is defined as the "friction force." Here, in the "friction force evaluation method", as shown in FIG. 4, a pressure plate 14 weighing 1.65 kg, at least the underside of which is covered with a fabric (assuming clothing) woven with cotton yarn, is placed on the mattress 2 on which the sheet 12 to be evaluated is laid, and a weight 15 of 10 kg is further placed on the pressure plate 14. After that, the pressure plate 14 is pulled horizontally from the sunk position, and the friction force value of the sheet 12 to be evaluated is measured by a force gauge (push-pull gauge) 16.

[0049] As the mattress 2, the above-mentioned body pressure dispersion mattress is used. A commercially available force gauge may be appropriately used as the force gauge 16. For example, RZ-50 (manufactured by Aikoh Engineering Co., Ltd.) may be used as the force gauge.

[0050] The bedsore prevention sheet 1 is knitted by adjusting the material, structure, etc. so that its frictional force is smaller than that of a sheet woven with cotton yarn. This allows the slipperiness of the bedsore prevention sheet 1 to be appropriate when the subject wearing the sheet lies on the bed. In other words, the slipperiness can be adjusted by changing the frictional force. As a result, it becomes possible to more sufficiently suppress inflammation of the skin. Furthermore, assuming that the frictional force of a sheet woven from cotton yarn is 1, the frictional force of the bedsore prevention sheet 1 is preferably 0.9 or less, and more preferably 0.6 to 0.9, in relative ratio. More specifically, the frictional force of the bedsore prevention sheet 1 is preferably less than 68.2N, more preferably 61.38N or less, and even more preferably 40.92 to 61.38N.

[0051] The moisture absorption of the bedsore prevention sheet 1 at 25°C and 80% RH measured in accordance with the Boken standard BQE A034 is 20μg / cm 2 More preferably, it is equal to or greater than this. Moisture absorption is 20μg / cm 2 If the moisture absorption amount is less than this range, the sweat absorbency may be insufficient compared to when the moisture absorption amount is within the above range. In addition, according to the VOKEN standard BQE A034, a sample piece (10 cm x 10 cm) is first conditioned in an initial box (25°C, 40% RH), then moved to a moisture absorption box (25°C, 80% RH) to measure the properties related to moisture absorption, and after equilibrium is reached, it is moved back to the initial box to measure the properties related to moisture release.

[0052] The bedsore prevention sheet 1 has a moisture absorption rate of 200μg / cm per unit area after 1 minute, measured according to the Boken standard BQE A034. 2 min or less, 1 to 200μg / cm 2 min, and 1 to 30 μg / cm 2 min, and more preferably 10 to 30 μg / cm 2 It is even more preferable that the ratio is .times.min. Moisture absorption rate is 1μg / cm 2 If the moisture absorption rate is less than 200 μg / cm 2 , the sweat absorption properties may be insufficient compared to when the moisture absorption rate is within the above range. 2 If the moisture absorption rate exceeds 100 μm, the sheets tend to become sticky, as compared with the case where the moisture absorption rate is within the above range.

[0053] Similarly, the bedsore prevention sheet 1 has a moisture release rate of 200μg / cm per unit area after 1 minute, measured according to the Boken standard BQE A034. 2 min or less, 1 to 200μg / cm 2 min, and 1 to 30 μg / cm2 min, and more preferably 10 to 30 μg / cm 2 It is even more preferable that the ratio is .times.min. Moisture release rate is 1μg / cm 2 If the moisture release rate is less than 200 μg / cm 3 , the sheet tends to become sticky, which is a disadvantage compared to when the moisture release rate is within the above range. 2 If the moisture release rate exceeds 100 sq. min, there is a disadvantage that the space between the sheet and the comforter becomes more likely to become stuffy due to moisture release, compared to when the moisture release rate is within the above range.

[0054] In the bedsore prevention sheet 1, by setting at least the longitudinal and lateral elongation rates and moisture absorption and release rates described above within the above ranges, the effect of dispersing body pressure provided by the body pressure distribution mattress is not hindered and inflammation of the skin due to friction with the body can be suppressed, making it possible to fully exert the bedsore prevention effect. Furthermore, in the bedsore prevention sheet 1, by setting the moisture absorption amount, moisture absorption rate, and moisture release rate as described above all within the above ranges, the sheet has excellent sweat absorption properties and a pleasant feel against the skin, making the bedsore prevention sheet 1 even more comfortable.

[0055] The bedsore prevention sheet 1 may be treated with a shape-memory, waterproof, anti-mite, antibacterial, deodorizing, wrinkle-resistant, flame-retardant, water-repellent, stain-resistant, anti-viral, or other finishes.

[0056] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments.

[0057] The bedsore prevention sheet 1 according to this embodiment is a flat sheet, but is not limited to this and may be, for example, a fitted sheet.

[0058] The bedsore prevention sheet 1 according to this embodiment is used for a body pressure dispersion mattress, but if the body pressure dispersion effect is not expected, it can also be used for a mattress that does not have the body pressure dispersion effect.

[0059] The bedsore prevention sheet 1 according to this embodiment is knitted using two reeds, but the number of reeds is not particularly limited. For example, it may be knitted using multiple reeds and multiple types of warp yarns. Further, the warp threads of the bedsore prevention sheet 1 are made up of the first warp threads which are unprocessed threads and the second warp threads which are woolly threads, but the type and number of the warp threads are not limited to this. For example, the first warp thread and the second warp thread may both be unprocessed yarns or both be woolly yarns. In addition, for the first warp thread and the second warp thread, a spun yarn may be used instead of the unprocessed yarn or the woolly yarn. In addition to the first warp yarn which is an untextured yarn and the second warp yarn which is a woolly yarn, other warp yarns may be included. In this case, the other warp yarns may be any of untextured yarns, woolly yarns, and spun yarns. EXAMPLES

[0060] (Examples 1 to 3) A sample sheet of warp knit fabric was produced using two reeds under the conditions shown in Table 1. Unprocessed yarn was used as the first warp thread, and woolly yarn was used as the second warp thread. The physical properties of the obtained sample sheets are shown in Tables 2 and 3. (Comparative Example) Sheets of woven fabric samples were made using 100% cotton yarn under the conditions shown in Table 1. The physical properties of the obtained sample sheets are shown in Tables 2 and 3.

[0061] (Table 1) TIFF0007637364000001.tif56166

[0062] In Table 1, "polyester" is a mixed fiber of 50% PET and 50% PTT, and "cotton" is 100% cotton. Additionally, "-" means not measured.

[0063] (Table 2) TIFF0007637364000002.tif49170

[0064] In Table 2, the elongation percentage is a value measured in accordance with the JIS L1096A method. The tensile strength is a value measured in accordance with JIS L1096A method. The moisture absorption amount was measured at 25°C and 80% RH in accordance with the VOKEN standard BQE A034. The moisture absorption rate is the moisture absorption rate per unit area after 1 minute measured in accordance with the VOKEN standard BQE A034. The moisture release rate is the moisture release rate per unit area after 1 minute measured in accordance with the VOKEN standard BQE A034. Additionally, "-" means not measured.

[0065] (Table 3) TIFF0007637364000003.tif66164

[0066] In Table 3, the measured shear force values ​​indicate the amount of change in pressure value output by the Shock Tip T40 when a 3-axis type Shock Tip T40 (manufactured by Touchence Inc.) was attached to the shoulder blades on the subject's back as shown in Figure 3, the subject was laid on his back on a sample sheet, and the subject was raised from a supine position (θ=0 degrees) to a position of θ=75 degrees using a Metis (registered trademark) (manufactured by Paramount Bed Co., Ltd.) at a constant speed over a period of approximately 23 seconds. The relative shear force value is a relative value when the measured shear force value of the sample of Comparative Example 1 is set to 1. The actual frictional force measurement was performed by placing a pressure plate 14 weighing 1.65 kg, at least the underside of which is covered with a fabric woven from cotton yarn, on a pressure-relieving mattress on which a sample sheet had been laid, as shown in FIG. 4, and then placing a weight of 10 kg on the pressure plate. The frictional force was measured using an RZ-50 (manufactured by Aikoh Engineering Co., Ltd.) when the pressure plate was pulled horizontally from its sunken position. The relative frictional force value is a relative value when the measured frictional force value of the sample of Comparative Example 1 is set to 1. Additionally, "-" means not measured.

[0067] (Evaluation) A pressure dispersion mattress was placed on the electric bed, and a sample sheet was placed on it. The subject lay on the mattress, and the back of the electric bed was raised to a position of θ = 75 degrees at a constant speed over a period of approximately 23 seconds. 1. After about 5 minutes had passed since the back was raised, the hammock phenomenon was evaluated visually for wrinkles according to the following criteria. The results are shown in Table 4. ○: The hammock phenomenon is not observed. △: Although the hummock phenomenon is slightly observed, its effect is limited. ×: The hammock phenomenon is clearly observed. 2. After about 5 minutes had passed since the subject's back was raised, the subject's posture was visually evaluated for slipperiness according to the following criteria. The results are shown in Table 4. 〇: Moderately slippery. △: It's slipping. ×: Not slipping. 3. The feel of the material was evaluated as follows. The subjects, four adult men and five adult women, were asked to wear eye masks and touch a sample sheet wrapped around a small piece of mattress, and then to rate the feel of the sheet based on the following criteria: 6 points: Very pleasant to the touch. 5 points: Feels good to the touch. 4 points: Slightly pleasant to the touch. 3 points: A little uncomfortable to the touch. 2 points: Unpleasant to the touch. 1 point: Very uncomfortable to the touch. The average scores obtained are shown in Table 4. In Table 4, "-" means that no evaluation was performed.

[0068] (Table 4) TIFF0007637364000004.tif58153

[0069] From Table 4, it was found that the samples of Examples 1 to 3 according to the present invention could reduce the hammock phenomenon and were excellent in slipperiness and touch, compared to the sample of Comparative Example 1 which is not according to the present invention. In particular, it was found that the samples of Examples 1 and 2 could reduce the hammock phenomenon and were excellent in slipperiness. Although the samples of Examples 1 and 2 were not evaluated for touch by subjects, the touch was equivalent to that of the sample of Example 3. From these findings, it was confirmed that the bedsore prevention sheet according to the present invention can prevent the occurrence of the hammock phenomenon and also reduce friction with the body. [Industrial Applicability]

[0070] The bedsore prevention sheet according to the present invention can be used as a sheet for a pressure-relieving mattress for preventing bedsores. The bedsore prevention sheet according to the present invention can prevent the occurrence of the hammock phenomenon and also prevent inflammation of the skin caused by friction with the body. [Explanation of symbols]

[0071] 1. Bedsore prevention sheets 11. Subjects 12...Sheets 13. Electric bed 14 Pressure plate 15... weight 16 Force gauge 1a···Sinker loop 1b Needle loop 2. Pressure-relieving mattress 41...Sheets 42. Mattress

Claims

1. A bedsore prevention sheet for use with a mattress capable of dispersing body pressure, A warp knitted fabric is made by making stitches using warp yarns and knitting the stitches together. The elongation in both the longitudinal and transverse directions, measured in accordance with JIS L1096A, is 60 to 230%. The CPI of the warp knitted fabric is 40 to 200, The warp yarn has a fineness of 11 to 220T; The number of filaments in the warp is 200 or less, The moisture absorption rate per unit area measured according to the VOKEN standard BQE A034 is 200 μg / cm ２ ・min or less, Moisture release rate per unit area is 200 μg / cm ２ - Bedsore prevention sheets that are less than min.

2. The slippage force measured by the slippage force evaluation method is smaller than that of a sheet woven with cotton yarn.

2. The bedsore prevention sheet according to claim 1, wherein the frictional force measured by the frictional force evaluation method is smaller than the frictional force of a sheet woven from cotton yarn.

3. The shear force according to the shear force evaluation method is less than 1.5 N, 2. The bedsore prevention sheet according to claim 1, wherein the frictional force according to a frictional force evaluation method is less than 68.2 N.

4. The CPI of the warp knitted fabric is 65 to 85, The warp yarn has a fineness of 33 to 84T; 2. The bedsore prevention sheet according to claim 1, wherein the number of filaments in the warp threads is 12 to 48.

5. A bedsore prevention sheet as described in claim 1, having a tensile strength in both the vertical and horizontal directions of 200 N or more, measured in accordance with JIS L1096A method.

6. A needle loop and a sinker loop are provided. The sinker loop is disposed on the side that contacts the skin, The needle loop is disposed on the surface side that contacts the mattress, The sinker loop is knitted with an untextured yarn, 2. The bedsore prevention sheet according to claim 1, wherein the needle loops are knitted with woolly yarn.

7. 2. The bedsore prevention sheet according to claim 1, wherein the warp threads are formed by combining a polyethylene terephthalate resin with a polytrimethylene terephthalate resin or a polybutylene terephthalate resin.

8. A bedsore prevention sheet as described in any one of claims 1 to 7, wherein the mattress has an evaluation value ratio of static body pressure reduction under overload measured in accordance with JIS T9256-2 of 100% or less.

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