Surgical sheet

Abstract

The present invention aims to provide a surgical sheet comprising a laminate in which a fiber layer and a cover material are laminated and integrated, thereby preventing a decrease in liquid absorption performance. [Solution] In the surgical sheet according to the present invention, the constituent fibers of the fiber layer are interwoven into the cover material, resulting in a laminated and integrated structure between the fiber layer and the cover material. Therefore, the surgical sheet is less prone to problems such as the cover material moving when it comes into contact with surgical instruments or the human body. Furthermore, in the surgical sheet of the present invention, the fiber layer and the cover material can be laminated and integrated without interlayer adhesion. As a result, the absorption of liquids that have passed through the permeable cover material into the fiber layer is not inhibited, and the surgical sheet can be made in which a decrease in liquid absorption performance is prevented.

Description

[Technical Field]

[0001] The present invention relates to a surgical sheet. More specifically, it relates to a surgical sheet that can be suitably used as a covering for the human body (patient) during surgery, as well as as a cover or underlay for the operating table on which the patient lies, and as a covering or underlay for medical equipment to prevent contamination of medical equipment during surgery. [Background technology]

[0002] Traditionally, during surgery, in order to reduce the risk of infection or contamination of the surgeon or other personnel by the patient's blood or bodily fluids, and to prevent the patient's blood, bodily fluids, and other liquids used in the surgery (hereinafter sometimes abbreviated as "liquids") from dripping onto the patient or the floor, it has been common practice to cover the patient with a surgical sheet that can absorb liquids during surgery.

[0003] As an example of such a surgical sheet, Japanese Patent Publication No. 2024-744 (Patent Document 1) discloses a surgical sheet in which a cover material is laminated on a fiber layer. The lamination configuration of the fiber layer and the cover material is as follows: • Just superimposed forms, - Interlayer bonding achieved by binder, hot melt web, or fiber bonding, or by subjecting to bonding treatments such as heat sealing or ultrasonic welding. This has been disclosed. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2024-744 [Overview of the project] [Problems that the invention aims to solve]

[0005] In the surgical sheet disclosed in Patent Document 1, the fiber layer is protected by a cover material, which prevents damage to the fiber layer responsible for absorbing liquids when it comes into contact with surgical instruments or the human body. However, the surgical sheet disclosed in Patent Document 1 had the following problems.

[0006] Firstly, in the case of surgical sheets where the fiber layer and cover material are simply overlapped, the cover material could move when surgical instruments or the human body came into contact with the surgical sheet. As a result, the smooth progress of the surgery was hindered by the surgical sheet.

[0007] Furthermore, in the case of a surgical sheet having a structure in which the fiber layer and the cover material are interlayer-bonded, a binder or fused-to-the-cover material and / or components of the fiber layer are formed between the fiber layer and the cover material. These binders and components present between the cover material and the fiber layer have the problem of inhibiting the absorption of liquid that has passed through the cover material into the fiber layer. As a result, the liquid absorption performance of the surgical sheet was reduced.

[0008] The present invention aims to provide a surgical sheet comprising a laminate in which a fiber layer and a cover material are laminated and integrated, thereby preventing a decrease in liquid absorption performance. [Means for solving the problem]

[0009] The present invention is, "(Claim 1) A surgical sheet comprising a laminate in which a fiber layer and a permeable cover material are laminated and integrated, The constituent fibers of the fiber layer penetrate into the cover material, thereby laminating and integrating the cover material and the fiber layer. Surgical sheet. (Claim 2) The constituent fibers of the fiber layer are present on the main surface of the cover material side of the laminate, The surgical sheet according to claim 1. (Claim 3) Both ends of the constituent fibers present on the main surface penetrate into the fiber layer and / or the cover material. The surgical sheet according to claim 2. (Claim 4) The cover material has a color. The fiber layer has at least a biaxial fiber orientation in a direction parallel to the main surface of the fiber layer, or has no specific fiber orientation in a direction parallel to the main surface of the fiber layer. The surgical sheet according to claim 1. (Claim 5) A film layer is provided on the fiber layer side in the laminate. The surgical sheet according to any one of claims 1 to 4. That is.

Advantages of the Invention

[0010] In the surgical sheet according to the present invention, the constituent fibers of the fiber layer penetrate into the cover material, so that the fiber layer and the cover material are integrally laminated. Therefore, when a surgical instrument or a human body comes into contact, it is a surgical sheet in which the problem of the cover material moving hardly occurs. And in the surgical sheet of the present invention, the fiber layer and the cover material can be in a state of being integrally laminated without being adhesively bonded between layers. Therefore, it can be a surgical sheet in which the liquid passing through the cover material having liquid permeability is not inhibited from being absorbed by the fiber layer, and the decrease in the liquid absorption performance is prevented.

[0011] Also, in another surgical sheet according to the present invention, until the constituent fibers of the fiber layer exist on the main surface on the cover material side in the laminate, the constituent fibers of the fiber layer deeply penetrate into the cover material. By having such a configuration, the fiber layer and the cover material are more firmly integrally laminated, and it is a surgical sheet in which the problem of the cover material moving hardly occurs when a surgical instrument or a human body comes into contact.

[0012] Furthermore, the liquid adhering to the main surface of the cover material travels along the constituent fibers of the fiber layer present on the main surface, and is easily and efficiently guided from the main surface of the cover material to the fiber layer. As a result, it is a surgical sheet that is further rich in liquid absorption performance.

[0013] Furthermore, in yet another surgical sheet according to the present invention, both ends of the constituent fibers of the fiber layer present on the main surface are embedded in the fiber layer and / or the cover material. In other words, there are fewer ends of the constituent fibers of the fiber layer present on the main surface of the cover material. This configuration prevents the main surface from becoming fuzzy, making it a surgical sheet that is less likely to have problems such as fuzzy fibers getting tangled in the cords of surgical instruments used during surgery, thereby hindering the smooth progress of the surgery.

[0014] Furthermore, liquid adhering to the main surface of the cover material is more easily guided from the main surface to the fiber layer by the constituent fibers of the fiber layer present on that main surface. As a result, it is a surgical sheet with even greater liquid absorption performance.

[0015] In surgical sheets comprising a laminate in which a colored cover material is laminated on a fiber layer, the color of the cover material appears uniform and even if the fiber layer has at least two directional fiber orientations in a direction parallel to its main surface, or if the fiber layer does not have a specific fiber orientation in a direction parallel to its main surface. Although the reason for this effect has not been fully clarified, it is thought that when the fiber layer beneath the cover material has the aforementioned fiber orientations (not just one type of fiber orientation), light passing through the fiber layer from the fiber layer side toward the cover material side, and light passing through the cover material and reflected within the fiber layer, can pass through the cover material in a dispersed state in various directions. On the other hand, if the fiber layer has only one fiber orientation, light passing through the fiber layer from the fiber layer side toward the cover material side, and light passing through the cover material and reflected within the fiber layer, will pass through the cover material in a biased state in a specific direction, resulting in unevenness in the color of the cover material.

[0016] Furthermore, the surgical sheet according to the present invention may have a film layer on the fiber layer side of the laminate. Therefore, the presence of the film layer prevents the liquid absorbed and retained by the fiber layer from leaking out to the film layer side of the surgical sheet. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic cross-sectional view showing the cross-section of a surgical sheet according to the present invention when it is cut in the thickness direction perpendicular to its main surface. The figure shows an embodiment that includes a film layer.

[0018] [Figure 2] This is a schematic cross-sectional view showing a cross-section of another surgical sheet according to the present invention, when it is cut in the thickness direction perpendicular to its main surface. The figure shows an embodiment that includes a film layer.

[0019] [Figure 3] This is a schematic cross-sectional view showing a cross-section of yet another surgical sheet according to the present invention, when it is cut in the thickness direction perpendicular to its main surface. Note that the figure shows an embodiment that includes a film layer. [Modes for carrying out the invention]

[0020] In the present invention, various configurations can be appropriately selected, such as the following configuration. Unless otherwise specified, the various measurements described in the present invention are performed under normal pressure and a temperature of 25°C. Unless otherwise specified, the various measurement results described in the present invention are obtained by measurement to a value one decimal place smaller than the desired value, and the desired value is calculated by rounding this value. For example, if the desired value is to be expressed to the first decimal place, the value is obtained to the second decimal place by measurement, and the obtained second decimal place value is rounded to the first decimal place, and this value is used as the desired value. In addition, the upper and lower limits exemplified in the present invention can be combined arbitrarily.

[0021] First, each embodiment of the surgical sheet according to the present invention will be explained using schematic cross-sectional views in Figures 1 to 3, which show the cross-section when the sheet is cut in the thickness direction perpendicular to its main surface. Figures 1 to 3 illustrate a surgical sheet equipped with a film layer. Also, in Figures 2 to 3, the reference numerals assigned in Figure 1 have been omitted.

[0022] The surgical sheet (100) according to the present invention comprises a laminate (10) in which a fiber layer (1) and a cover material (2) are laminated and integrated. The constituent fibers of the fiber layer (1) penetrate into the cover material (2), thereby laminating and integrating the cover material (2) and the fiber layer (1). In Figure 1, the constituent fibers of the fiber layer (1) that penetrate into the cover material (2) are indicated by the reference numeral 3. Furthermore, the surgical sheet (100) is shown in an embodiment in which a film layer (20) is provided on the fiber layer (1) side (downward side on the paper) of the laminate (10).

[0023] Another surgical sheet (200) according to the present invention has constituent fibers (3) of the fiber layer (1) embedded in the cover material (2), and these constituent fibers (3) are present on the main surface (4) on the cover material (2) side (upward side on the paper) of the laminate (10). In Figure 2, the portion of the constituent fibers (3) of the fiber layer (1) embedded in the cover material (2) that is present on the main surface (4) is denoted by the symbol 3'. Furthermore, the surgical sheet (200) is shown in an embodiment in which a film layer (20) is provided on the fiber layer (1) side (downward side on the paper) of the laminate (10).

[0024] In yet another surgical sheet (300) according to the present invention, the constituent fibers (3) of the fiber layer (1) are embedded in the cover material (2), and both ends of the constituent fibers (3) of the fiber layer (1) present on the main surface (4) are embedded in the fiber layer (1) and / or the cover material (2). In Figure 3, among the constituent fibers (3) of the fiber layer (1) present on the main surface (4), the constituent fibers (3) whose ends are embedded in the fiber layer (1) and / or the cover material (2) are indicated by the reference numeral 3''. Furthermore, in the surgical sheet (300), an embodiment is shown in which a film layer (20) is provided on the fiber layer (1) side (downward side on the paper) of the laminate (10).

[0025] The fibrous layer of the surgical sheet according to the present invention primarily serves to absorb liquids such as human blood, bodily fluids, and medical solutions used in surgery.

[0026] The fiber layer is a fiber layer derived from a fabric (such as a web, nonwoven fabric, or fiber sheet such as a woven or knitted fabric), and may be a layer of fibers in which constituent fibers derived from the web or nonwoven fabric are intertwined randomly or with a fiber orientation, or a layer of fibers in which constituent fibers derived from the woven or knitted fabric are intertwined regularly. However, it is preferable that the fiber layer be derived from a web or nonwoven fabric so that the surgical sheet is rich in voids and can absorb a large amount of liquid.

[0027] The types of fibers constituting the fiber layer can be selected as appropriate. However, in order to absorb a large amount of liquid, it is preferable that the fiber layer consists of one or more of the following constituting fibers: regenerated fibers such as rayon and cupro; semi-synthetic fibers such as acetate; synthetic fibers made of a single resin such as nylon, vinylon, vinylidene, polyvinyl chloride, polyester, acrylic, polyolefin (polypropylene, polyethylene, etc.), and polyurethane, or containing two or more of these resins; plant fibers such as cotton and linen; and animal fibers such as wool and silk. Among these, it is preferable that the fiber layer contains hydrophilic fibers with an official moisture content of 4% or more, such as rayon, cupro, acetate, nylon, vinylon, cotton, linen, wool, and silk. Hydrophilic fibers obtained by imparting hydrophilicity to non-hydrophilic fibers (e.g., polyester fibers) with an official moisture content of less than 4% can also be suitably used. For example, non-hydrophilic fibers can be made hydrophilic by sulfonation treatment, fluorine gas treatment, vinyl monomer graft polymerization treatment, discharge treatment, surfactant imparting treatment, or hydrophilic resin imparting treatment.

[0028] Although the reason is unclear, hydrophilic fibers to which two or more surfactants with different ionic properties have been applied during the surfactant application process are suitable because they readily attract various ionic components contained in bodily fluids, such as blood and other bodily fluids, thus easily retaining them. One or more surfactants selected from anionic, cationic, nonionic, and amphoteric surfactants with different ionic properties can be applied to non-hydrophilic fibers to create hydrophilic fibers.

[0029] Furthermore, among hydrophilic fibers obtained by adding a surfactant to a non-hydrophilic fiber, if the non-hydrophilic fiber is polyester fiber, it exhibits excellent heat resistance, weather resistance, and chemical resistance, making it easier to maintain quality such as liquid absorption without being affected by the usage or storage environment of the surgical sheet. In addition, polyester fiber does not easily absorb liquid into the fiber like primitive hydrophilic fibers such as rayon fiber, so wrinkles are less likely to occur even if the surgical sheet repeatedly absorbs and dries during long surgeries. As a result, it is preferable because it can maintain its shape and provides a good user experience.

[0030] Furthermore, if a fiber layer containing fibers that easily absorb water and swell is subjected to a water-jet entanglement treatment and then dried, there is a risk that the treated fibers may easily detach from the water-jet entanglement treatment. For this reason, it is preferable that the fibers constituting the fiber layer be fibers that do not easily absorb water and swell, such as polyester fibers or polypropylene fibers.

[0031] The aforementioned fiber layer may contain additives such as flame retardants, fragrances, pigments and dyes, antibacterial agents, antifungal agents, photocatalytic particles, and emulsifiers. The configuration in which the fiber layer contains additives can be adjusted as appropriate; the additives may be supported on the surface of the constituent fibers of the fiber layer by a binder or the like, or they may be kneaded into the constituent fibers of the fiber layer.

[0032] As a specific example, the constituent fibers of the fiber layer may be fibers made of resin into which pigment has been kneaded. Alternatively, the fiber layer may have color due to being dyed with a dye. In particular, it is preferable when additives are kneaded into the constituent fibers of the fiber layer, as this prevents the pigment from falling off the surgical sheet. Furthermore, the fiber layer may have color due to exhibiting structural color.

[0033] To achieve the effects described above, the percentage of the mass of hydrophilic fibers (including hydrophilic fibers obtained by imparting hydrophilicity to non-hydrophilic fibers; the same applies hereinafter) in the total mass of the constituent fibers of the fiber layer is preferably 30 mass% or more, more preferably 60 mass% or more, even more preferably 90 mass% or more, and most preferably 100 mass%.

[0034] The fineness of the constituent fibers of the fiber layer can be adjusted as appropriate. To provide a surgical sheet with a fiber layer rich in voids and capable of absorbing large amounts of liquid, the fineness is preferably 0.5 dtex or higher, and more preferably 0.8 dtex or higher. On the other hand, if the fineness is too high, it may be difficult to retain liquid, so it is preferably 12 dtex or lower, more preferably 10 dtex or lower, and more preferably 8 dtex or lower.

[0035] Furthermore, a fiber layer can be formed by laminating multiple types of webs or nonwoven fabrics. In addition, a fiber layer can be formed by blending multiple types of fibers with different finenesses, in which case a surgical sheet with a fiber layer that has excellent liquid absorption and retention properties is preferable.

[0036] The average fineness of a fiber layer formed by blending multiple types of fibers with different fineness can be appropriately adjusted to provide a surgical sheet with a fiber layer that has excellent liquid absorption and retention properties. For example, the average fineness is preferably 0.5 to 20 dtex, preferably 1.0 to 10 dtex, and preferably 1.5 to 5 dtex.

[0037] The average fineness, which is the average of the fineness of each fiber type constituting the fiber layer, can be calculated from the fineness of each fiber constituting the fiber layer and the percentage of the mass of each fiber relative to the total mass of the fibers constituting the fiber layer. Specifically, the average fineness of a fiber layer made by blending fiber A with a fineness of 1.6 dtex and fiber B with a fineness of 6.6 dtex in equal mass (50% by mass:50% by mass) can be calculated to be 4.1 dtex.

[0038] The fiber length of the constituent fibers of the fiber layer can be adjusted as appropriate. These may be short fibers cut to a specific length, or continuous fibers that are not cut to a specific length and have a continuous length, such as those produced by direct spinning. However, using short fibers for the constituent fibers of the fiber layer makes it easier for the constituent fibers of the fiber layer to penetrate the cover material. As a result, it is preferable to provide a surgical sheet in which the fiber layer and cover material are more firmly laminated and integrated. The fiber length of the constituent fibers is preferably 25 mm or longer, and more preferably 35 mm or longer. On the other hand, if the fiber length is too long, the weave may become poor and uneven liquid absorption may occur; therefore, the fiber length of the constituent fibers is preferably 110 mm or less, and more preferably 80 mm or less. Note that "fiber length" refers to the average fiber length measured by the method specified in JIS L1015 (Chemical Fiber Staple Test Method):2021, Section 8.4.1, Method B (Corrected Staple Diagram Method).

[0039] The constituent fibers of the fiber layer according to the present invention can be entangled and bonded to each other by, for example, water entanglement treatment or needle punching treatment, but they can also be bonded to each other by fusion of the constituent fibers or adhesion with a binder. Among these, when the constituent fibers are bonded to each other solely by fiber entanglement, it is preferable because it does not contain binders or fused components of the fiber layer, resulting in a fiber layer with excellent liquid absorption and retention properties and a soft texture. In particular, a fiber layer derived from nonwoven fabric that has been entangled by water entanglement treatment is hygienically superior because contaminants attached to the fibers are washed away, making it suitable as a fiber layer for a surgical sheet.

[0040] The fiber orientation of the fiber layer can be selected as appropriate. For example, it may be a fiber layer in which the fibers are oriented in one direction parallel to the main surface of the fiber layer (e.g., a fiber layer derived from a unidirectional web), a fiber layer having at least two directional fiber orientations in the direction parallel to the main surface of the fiber layer (e.g., a fiber layer derived from a crosslay web or a crisscross web), or a fiber layer that does not have a specific fiber orientation in the direction parallel to the main surface of the fiber layer (e.g., a fiber layer derived from a random web). A crosslay web is a web formed by folding unidirectional webs so that their fiber orientations do not overlap. A crisscross web is a web formed by laminating a unidirectional web and a crosslay web.

[0041] In particular, it is preferable that the fiber layer has at least two directional fiber orientations parallel to its main surface, or that the fiber layer does not have a specific fiber orientation in the direction parallel to its main surface, so that it can absorb a large amount of liquid, and so that the color of the surgical sheet, which has a laminate in which a colored cover material is laminated on the fiber layer, appears uniform and even.

[0042] The fiber orientation of the measurement target, such as the fiber layer or the fabric cover material used in the example, can be confirmed by the following method.

[0043] (Method for confirming fiber orientation) (Step 1) Prepare the object to be measured. (Step 2) A test specimen (square shape with sides of 10 mm or more) is taken from the object to be measured so that it has two sides that are parallel to the production direction (MD direction) and opposite each other, and fixed to a mounting board. At this time, it is fixed to the mounting board so that one main surface (main surface A) is exposed and can be observed. Microscope images or electron microscope images can be used for confirmation. (Step 3) From among the fibers constituting the exposed main surface A, 20 or more fibers are randomly selected that, when viewed from the main surface A side, have a length direction of the fiber that is greater than 0° and less than 90° clockwise with respect to the aforementioned MD direction. The length direction of the fiber refers to the direction of the longer side of the smallest rectangle drawn to enclose the fiber in the microscope image or electron microscope image of the fiber in question. (Step 4) The standard deviation is calculated from the angle that the longitudinal direction of the selected fibers makes with respect to the MD direction of the test specimen and its average value. If the value of the standard deviation is within 20, it is determined that the fiber layer constituting the object being measured has a fiber orientation A that has an angle greater than 0° and less than 90° clockwise with respect to the MD direction of the test specimen. (Step 5) From among the fibers constituting the exposed main surface A, 20 or more fibers are randomly selected that, when viewed from the main surface A side, have an angle greater than 0° and less than 90° counterclockwise with respect to the MD direction of the test piece. (Step 6) The standard deviation is calculated from the angle that the longitudinal direction of the selected fibers makes with respect to the MD direction of the test specimen and its average value. If the value of the standard deviation is within 20, it is determined that the fiber layer constituting the object being measured has a fiber orientation B in which the angle with respect to the MD direction of the test specimen is greater than 0° and less than 90° in a counterclockwise direction. (Step 7) Similarly, confirm whether the other main surface (main surface B) of the test specimen has fiber orientation A and / or fiber orientation B.

[0044] Based on the above measurement results, if the main surface A and / or main surface B of the measured sample piece have both fiber orientation A and fiber orientation B, then the object from which the sample was taken is determined to have at least bidirectional fiber orientation. Fiber layers having at least bidirectional fiber orientation include, for example, fiber layers composed of crosslay webs or fiber layers composed of crisscross webs.

[0045] Furthermore, even if the main surfaces A and B of the measured sample do not have at least bidirectional fiber orientation, if the constituent fibers of main surface A and / or main surface B of the measured sample are oriented unevenly, the object from which the sample was taken is determined to not have a specific fiber orientation. An example of an object that does not have a specific fiber orientation is a fiber layer composed of a random web.

[0046] Alternatively, if the main surfaces A and B of the measured sample piece have only fiber orientation A or fiber orientation B, if the main surfaces A and B of the measured sample piece have only fiber orientation parallel to the MD direction, or if the main surfaces A and B of the measured sample piece have only fiber orientation perpendicular to the MD direction, then the object from which the sample piece was taken is determined to have only unidirectional fiber orientation. An object that has only unidirectional fiber orientation is, for example, a fiber layer consisting of only one unidirectional web.

[0047] While there are no specific limitations on the basis weight or thickness of the fiber layer, excessive weight or thickness may impair drape and reduce the usability of the surgical sheet. Conversely, excessive weight or thickness may reduce liquid absorption and retention. Therefore, the basis weight should be between 15 and 200 g / m². 2 Preferably, it is 30-100 g / m 2 It is more preferable that this is the case. In the present invention, the "basis length" is the main surface, which is the widest surface, 1m 2This is the mass per unit area, obtained by the method specified in JIS L1085:1998, 6.2 "Mass per unit area". The thickness is preferably 0.1 to 3 mm, and more preferably 0.2 to 1.5 mm. "Thickness" is measured over an area of ​​5 cm² with respect to the thickness direction perpendicular to the main surface of the object being measured. 2 This refers to the arithmetic mean of the thicknesses obtained by measuring the length between the two main surfaces of the object being measured at five randomly selected locations within a loading area where a load of 0.98 N (= 100 gf) is applied. Such thickness measurements can be performed, for example, using a high-precision digital length measuring instrument (Mitutoyo Corporation, Lightmatic®).

[0048] The cover material of the surgical sheet according to the present invention primarily serves to prevent damage to the fiber layer when it comes into contact with surgical instruments or the human body. The cover material has a porous structure that allows for liquid permeability and can be made of fabric, a porous film, or a porous foam.

[0049] If the cover material is a woven fabric, the composition, properties, and manufacturing method of the constituent fibers of the cover material can be appropriately selected from among the constituent fiber compositions, properties, and manufacturing methods exemplified as applicable to the fiber layer.

[0050] The cover material described above may contain additives such as flame retardants, fragrances, pigments and dyes, antibacterial agents, antifungal agents, photocatalytic particles, and emulsifiers. The form in which the cover material contains additives can be adjusted as appropriate; the additives may be supported on the surface of the cover material by a binder or the like, or they may be kneaded into the components of the cover material.

[0051] For example, if the cover material is a fabric, its constituent fibers may be made of resin into which pigment has been kneaded. Alternatively, the cover material may have color due to being dyed with a dye. In particular, it is preferable if additives are kneaded into the constituent fibers of the cover material, as this prevents the pigment from falling off the surgical sheet. Furthermore, the cover material may have color due to exhibiting structural color.

[0052] When the cover material is a porous film or porous foam, the resin, composition, and properties of the cover material can be appropriately selected from among the resins, compositions, and properties exemplified as applicable to the fiber layer. Furthermore, the manufacturing method of the cover material can be one that is known for manufacturing porous films or porous foams.

[0053] In particular, it is preferable that the cover material be a woven fabric because the constituent fibers of the fiber layer can easily penetrate into the cover material, making it easier to laminate and integrate the fiber layer and the cover material more firmly, and also because the cover material itself can absorb a large amount of liquid. In particular, if the cover material is a woven fabric composed of continuous fibers (especially spunbond nonwoven fabric), it is preferable that the main surface of the cover material is smooth and has few fiber ends, making it less prone to fraying and resulting in a surgical sheet with excellent function in preventing damage to the fiber layer.

[0054] In particular, the cover material preferably has hydrophilic properties. As a cover material with hydrophilic properties, for example, it is preferable that the cover material is prepared using a resin into which a hydrophilizing agent has been kneaded. Specifically, it is preferable that the cover material be a fabric (especially a spunbond nonwoven fabric) prepared by spinning and collecting a resin into which a hydrophilizing agent has been kneaded.

[0055] Furthermore, if a cover material containing fibers that easily absorb water and swell is subjected to a water-jet entanglement treatment and then dried, there is a risk that the fibers will easily detach from the water-jet entangled cover material. For this reason, it is preferable that the fibers constituting the cover material are fibers that do not easily absorb water and swell, such as polyester fibers or polypropylene fibers.

[0056] While there are no specific restrictions on the weight or thickness of the cover material, excessive weight or thickness may impair drape and reduce the usability of the surgical sheet. On the other hand, excessive weight or thickness may make it difficult to adequately protect the fiber layer. Therefore, the weight should be between 10 and 200 g / m². 2 Preferably, it is 15-100 g / m 2 It is more preferable that the amount be 20-80 g / m².2 It is more preferable that it be as follows. Furthermore, the thickness is preferably 0.05 to 3 mm, and more preferably 0.15 to 1.5 mm.

[0057] In the surgical sheet of the present invention, the constituent fibers of the fiber layer are embedded in the cover material, thereby laminating the cover material and the fiber layer into a single integrated unit. Whether or not a surgical sheet has this configuration can be confirmed by the following method.

[0058] (Verification Method 1) (Step 1) Using optical microscope images or electron microscope images taken of both main surfaces or cross-sections of the surgical sheet, it is confirmed whether the surgical sheet comprises a laminate having a layer made of fibers and adjacent to a porous, permeable component. (Step 2) If the surgical sheet comprises a laminate having the configuration described in (Step 1) above, the layer composed of fibers confirmed in (Step 1) is assumed to be a fiber layer. Then, a porous, permeable component adjacent to the fiber layer confirmed in (Step 1) is assumed to be a cover material. (Step 3) Take multiple square-shaped samples, each 10 cm on a side, from the surgical sheet. In order to make it easier to identify the constituent fibers of the fibrous layer, each sample may be stained with a staining solution that can stain the constituent fibers (for example, Kayastain Q (manufactured by Nippon Kayaku Co., Ltd.)). (Step 4) Prepare optical microscope images or electron microscope images of the cross-section of the sample. Then, check whether the constituent fibers of the fiber layer are present in the cross-sectional images of the sample, moving from the fiber layer toward the main surface of the cover material in the laminate, and extending into the cover material.

[0059] If there are constituent fibers of the fiber layer that have penetrated from the fiber layer into the cover material in this manner, the surgical sheet from which the sample was taken is determined to have a laminate in which the cover material and the fiber layer are laminated together as a single unit, due to the constituent fibers of the fiber layer penetrating into the cover material.

[0060] On the other hand, if there are no constituent fibers of the fiber layer that have penetrated from the fiber layer into the cover material, the process proceeds to the following step. (Step 5) In the above-mentioned (Step 2), a new combination of fiber layer and cover material is selected, and the above-mentioned (Steps 3-4) is attempted. As a result of the verification, if, in any of the new combinations of fiber layer and cover material, there are constituent fibers of the fiber layer that penetrate from the fiber layer toward the main surface on the cover material side of the laminate, it is determined that the surgical sheet from which the sample was taken has a laminate in which the cover material and fiber layer are laminated together as one, due to the constituent fibers of the fiber layer penetrating into the cover material. On the other hand, if, in any combination of fiber layer and cover material, no constituent fibers of the fiber layer have penetrated from the fiber layer into the cover material, then it is determined that the constituent fibers of the fiber layer have not penetrated into the cover material in the surgical sheet from which the sample was taken.

[0061] A laminate in which the constituent fibers of a fiber layer are embedded in a cover material can be prepared, for example, by laminating a fabric capable of forming a fiber layer with a cover material, and then applying a fiber entanglement treatment such as water flow entanglement treatment or needle punching treatment from the fabric side. In this case, if the constituent fibers of the fiber layer are short fibers, it is preferable that the constituent fibers of the fiber layer are easily embedded in the cover material, thereby making it easier to provide a surgical sheet in which the cover material and the fiber layer are firmly laminated and integrated.

[0062] In the surgical sheet of the present invention, the constituent fibers of the fiber layer are embedded in the cover material, so that the fiber layer and the cover material are laminated and integrated. Therefore, this surgical sheet is less prone to the problem of the cover material moving when it comes into contact with surgical instruments or the human body.

[0063] Furthermore, the surgical sheet of the present invention allows for the lamination and integration of the fiber layer and the cover material without interlayer bonding between the two. Therefore, the absorption of liquids that pass through the cover material into the fiber layer is not inhibited, resulting in a surgical sheet that prevents a decrease in liquid absorption performance. In addition, because there is no binder or fused components of the cover material and / or components of the fiber layer between the fiber layer and the cover material, the texture does not become hard, and the surgical sheet exhibits the effect of easily adhering to the human body when covering it.

[0064] Furthermore, in the surgical sheet according to the present invention, it is preferable that the constituent fibers of the fiber layer penetrate deeply into the cover material until the constituent fibers of the fiber layer are present on the main surface of the cover material side of the laminate. By having a laminate in this manner, the fiber layer and the cover material are more firmly laminated and integrated, resulting in a surgical sheet that is less prone to the problem of the cover material moving when it comes into contact with surgical instruments or the human body. Moreover, liquid adhering to the main surface of the cover material is easily guided efficiently from the main surface of the cover material to the fiber layer by traveling along the constituent fibers of the fiber layer present on the main surface. As a result, the surgical sheet can be made even more liquid-absorbent.

[0065] Whether or not constituent fibers of the fiber layer are present on the main surface of the cover material in the laminate can be confirmed by the following method.

[0066] (Verification Method 2) In the optical microscope or electron microscope image of the cross-section taken using the above-mentioned (Confirmation Method 1), confirm whether the constituent fibers of the fiber layer have penetrated into the cover material and whether the constituent fibers are present on the main surface of the cover material side in the laminate.

[0067] If the confirmation reveals that the constituent fibers are present on the main surface of the cover material in the laminate, it is determined that in the surgical sheet from which the sample was taken, the constituent fibers of the fiber layer have penetrated into the cover material, and the constituent fibers are present on the main surface of the cover material in the laminate. On the other hand, if the constituent fibers are not present on the main surface, it is determined that in the surgical sheet from which the sample was taken, the constituent fibers of the fiber layer have penetrated into the cover material, and the constituent fibers are not present on the main surface of the cover material in the laminate.

[0068] Furthermore, a surgical sheet in which the constituent fibers of the fiber layer penetrate deeply enough to be present on the main surface of the cover material in the laminate can be prepared, for example, by laminating a fabric capable of forming a fiber layer with a cover material, and then performing a fiber entanglement treatment such as water flow entanglement treatment or needle punching treatment from the fabric side, for example by increasing the pressure of the water flow, increasing the depth of needle penetration, increasing the water flow density or needle density, or performing the fiber entanglement treatment multiple times.

[0069] Furthermore, in the surgical sheet according to the present invention, it is preferable that both ends of the constituent fibers of the fiber layer present on the main surface on the cover material side of the laminate are embedded in the fiber layer and / or the cover material. By having a laminate in this form, the main surface is prevented from being in a fuzzy state, and the surgical sheet is less likely to have problems such as fuzzy fibers getting tangled in the cords of surgical instruments used during surgery, which would hinder the smooth progress of the surgery.

[0070] Furthermore, liquid adhering to the main surface of the cover material is more easily guided from the main surface to the fiber layer by the constituent fibers of the fiber layer present on that main surface. As a result, the surgical sheet can have even greater liquid absorption performance.

[0071] Whether or not the ends of the constituent fibers of the fiber layer present on the main surface of the cover material in the laminate have penetrated the fiber layer and / or the cover material can be confirmed by the following method.

[0072] (Verification Method 3) Based on the results of the verification (Verification Method 2) described above, in a sample in which it was confirmed that the constituent fibers of the fiber layer have penetrated the cover material and that these constituent fibers are present on the main surface on the cover material side of the laminate, the number of constituent fibers with exposed ends is determined from 100 randomly selected constituent fibers of the fiber layer present on the main surface. Whether or not the ends of the constituent fibers of the fiber layer are exposed can be confirmed using a stereomicroscope (magnification 10 to 50 times). If the number of fibers is less than 80, it is determined that in the surgical sheet from which the sample was taken, both ends of the constituent fibers of the fiber layer present on the main surface on the cover material side of the laminate have penetrated the fiber layer and / or the cover material. On the other hand, if the number of fibers is 80 or more, it is determined that in the surgical sheet from which the sample was taken, both ends of the constituent fibers of the fiber layer present on the main surface on the cover material side of the laminate have not penetrated the fiber layer and / or the cover material.

[0073] In this case, the fewer the number of fibers, the more the ends of the constituent fibers present on the main surface are embedded in the fiber layer and / or the cover material. Therefore, it is preferable that the number of fibers be 60 or less, and more preferably 40 or less.

[0074] Furthermore, a laminate in which both ends of the constituent fibers of the fiber layer present on the main surface on the cover material side of the laminate are embedded in the fiber layer and / or the cover material can be prepared by applying a fiber entanglement treatment, such as water flow entanglement treatment or needle punching treatment, from the cover material side to a laminate in which the constituent fibers of the fiber layer are present on the main surface on the cover material side of the laminate. However, if the fiber entanglement treatment is applied to both main surfaces of the laminate simultaneously, it becomes difficult for the constituent fibers of the fiber layer to penetrate into the fiber layer and the cover material. Therefore, as described above, it is preferable to apply the water flow entanglement treatment to the main surface on the fiber layer side first, and then apply the water flow entanglement treatment to the main surface on the cover material side.

[0075] The basis weight and thickness of the laminate are not particularly limited, but if the basis weight and thickness are too large, the drapability may be impaired and the usability of the surgical sheet may be reduced. On the other hand, if the basis weight and thickness are too small, it may be difficult to maintain the rigidity required for the surgical sheet. Therefore, the basis weight is preferably 25 to 400 g / m 2 and more preferably 45 to 200 g / m 2 . Further, the thickness is preferably 0.15 to 6 mm, and more preferably 0.35 to 3 mm.

[0076] The surgical sheet may be constituted by using only the laminate in which the fiber layer and the cover material are integrally laminated according to the present invention. However, in order to provide a surgical sheet capable of preventing the liquid absorbed by the fiber layer from dripping onto the human body (patient) or the floor surface, it is preferable that the surgical sheet is provided with a film layer having no liquid permeability on the fiber layer side of the laminate.

[0077] The film layer may be a layer derived from a film, or may be a thin film-like resin-derived layer formed on the fiber layer, for example, in a state where a resin capable of forming the film layer is melted or in a solution state of the resin on the main surface of a fabric capable of constituting the fiber layer.

[0078] The material constituting this film layer is not particularly limited. For example, it can be composed of an organic polymer that can be formed into a film, such as polyolefin resins such as polypropylene and polyethylene; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polycarbonate; resins such as polyvinyl chloride, polyether ether ketone, and chlorinated polyvinyl chloride. It can also be composed of a resin containing an inorganic component, such as a silicone resin.

[0079] While there are no specific limitations on the basis weight or thickness of the film layer, excessive weight or thickness may impair drape and reduce the usability of the surgical sheet. On the other hand, if the weight or thickness is too low, liquid may easily leak into the film layer of the surgical sheet. Therefore, the basis weight should be 5-60 g / m². 2 It can be 10-40g / m 2 It can be as follows. Also, the thickness can be 0.005 to 1 mm, 0.01 to 0.5 mm, or 0.015 to 0.1 mm.

[0080] The manner in which the fiber layer and the film layer are bonded can be adjusted as appropriate. The entire main surface of the fiber layer and the entire main surface of the film layer may be bonded, or the fiber layer and the film layer may be partially bonded between their main surfaces. The bonding method can be selected as appropriate, but for example, dry lamination, extrusion lamination, hot melt lamination, wet lamination, wax lamination, or thermal lamination can be used.

[0081] Alternatively, the fabric capable of forming the fiber layer and the film capable of forming the film layer may be bonded using a binder such as hot-melt resin, or using bonding treatments such as heat sealing or ultrasonic welding. The amount of binder bonding the fiber layer and the film layer can be adjusted as appropriate, but if the amount of binder is too large, the liquid absorption and retention performance, as well as the absorbent drape, may be impaired, potentially reducing the usability of the surgical sheet. Therefore, 30 g / m² is recommended. 2 The following is preferable: 20 g / m 2 The following is preferable: 10 g / m 2 The following is preferable: 5 g / m 2 The following is preferable. Also, if the amount of binder is too small, sufficient adhesive strength cannot be obtained, so 0.1 g / m 2 The above is preferable, 0.5 g / m 2 The above is preferable, 1 g / m 2 The above is preferable.

[0082] Furthermore, in another embodiment, functional agent particles such as superabsorbent powder may be present between the nonwoven fabric layer and the film layer. The presence of these particles makes it possible to provide a surgical sheet with enhanced functionality.

[0083] Furthermore, the external shape of the surgical sheet can be adjusted as appropriate and is not particularly limited, but it may have cut-out or notched sections. In addition, these cut-out sections may be replaced with transparent film. For example, by partially constructing a transparent film in a desired area of ​​the surgical sheet, surgical instruments can be operated while viewing the transparent film area. Therefore, by covering both the patient and the surgical instruments together, surgery can be performed without contaminating the human body (patient), the floor, or the surgical instruments.

[0084] Furthermore, the shape and number of the cut-out portions can be adjusted as appropriate depending on the surgical procedure. When the surgical sheet of the present invention includes a film layer, even if cut-out portions are formed, the constituent fibers of the fiber layer are less likely to unravel from the cut-out portions, resulting in low dust generation. [Examples]

[0085] Examples of the present invention are described below, but the present invention is not limited to these examples.

[0086] (Preparation of laminated web and spunbond nonwoven fabric) Polyester staple fibers A (fineness: 1.6 dtex, fiber length: 51 mm) and polyester staple fibers B (fineness: 6.6 dtex, fiber length: 51 mm) were prepared, each containing a total of 0.3 mass% of anionic and nonionic surfactants. After blending 70% by mass of polyester staple fibers A and 30% by mass of polyester staple fibers B, the fibers are opened using a roller carding machine to create a unidirectional web (basis weight: 11g / m²) with fibers oriented in the direction of transport. 2 One sheet was formed. Furthermore, a unidirectional web formed in the same manner is fed to a cross wrapper, and the webs are stacked so as to intersect with the web transport direction to form a crosslay web (basis weight: 12g / m²). 2 Two sheets of ) were formed. Next, the unidirectional web / crosslay web / crosslay web are stacked in that order, so that the transport direction of the unidirectional web matches the direction in which the crosslay web was transported, to form a stacked web (basis weight: 35g / m²). 2 A fiber with an average fineness of 4.1 dtex was prepared. In addition, spunbond nonwoven fabric (basis weight: 15g / m²) is made of continuous fibers composed of polypropylene resin with a hydrophilic agent kneaded into it. 2 Fibers with an average diameter of 20 μm were prepared.

[0087] (Comparative Example 1) The laminated webs being transported are subjected to a water entanglement treatment by sequentially spraying a water stream at a pressure of 13 MPa onto the main surface side of the crosslay webs and the main surface side of the unidirectional webs, respectively, to create a water entangled nonwoven fabric (basis weight: 35 g / m²). 2 They manufactured a fiber with an average fineness of 4.1 dtex. On the main surface derived from the unidirectional web in the water-entangled nonwoven fabric, molten polyolefin-based hot melt resin is applied at a rate of 3 g / m². 2 The material was applied, and a spunbond nonwoven fabric was laminated on top of it. After cooling, a laminate was prepared in which the water-entangled nonwoven fabric and the spunbond nonwoven fabric were interlayer-bonded by hot-melt resin. The prepared laminate consisted of a fiber layer derived from the water-entangled nonwoven fabric and a spunbond nonwoven fabric used as a cover material. However, the constituent fibers of the water-entangled nonwoven fabric were not embedded in the spunbond nonwoven fabric. Subsequently, the laminate is cut into rectangular shapes with dimensions of 320 cm in the transport direction when subjected to water entanglement treatment, and 210 cm in the direction perpendicular to the transport direction, to form surgical sheets (basis weight: 53 g / m²). 2 A sample with a thickness of 0.5 mm was prepared.

[0088] (Example 1) A spunbond nonwoven fabric was laminated onto the main surface derived from the unidirectional web in a laminated web, and a water jet entanglement treatment was performed by ejecting a water jet at a pressure of 13 MPa from the laminated web side. In this way, a laminate in which the laminated web and the spunbond nonwoven fabric are laminated and integrated was prepared. The prepared laminate consisted of a fiber layer derived from the laminated web and a spunbond nonwoven fabric as a cover material. The constituent fibers of the laminated web became embedded in the spunbond nonwoven fabric, resulting in the spunbond nonwoven fabric and the water-entangled nonwoven fabric being laminated together as one, as shown in Figure 1. Subsequently, the laminate is cut into rectangular shapes with dimensions of 320 cm in the transport direction when subjected to water entanglement treatment, and 210 cm in the direction perpendicular to the transport direction, and used as surgical sheets (basis weight: 50 g / m²). 2 A sample with a thickness of 0.5 mm was prepared.

[0089] The surgical sheets prepared in Comparative Example 1 and Example 1 were subjected to the following (Method for Evaluating Water Absorption) to evaluate the liquid absorption performance of the surgical sheets.

[0090] (Method for evaluating water absorption) (Step 1) Prepare a sample holder that has a slope at an angle of 45° and a sample holding frame with a diameter of 150 mm in the center of the slope, as used in the (water repellency test (spray test)) described in JIS L1092:2009 "Test method for waterproofness of textile products". (Step 2) From the surgical sheet, take five square-shaped samples, each with sides of 20 cm, so that the two sides opposite to the direction in which the sample was transported during the water entanglement treatment are parallel. (Step 3) When the sample is transported during the water flow entanglement treatment, the sample is placed on the inclined surface of the sample holder and fixed with the sample holder frame so that the direction in which the sample is transported is perpendicular to the direction of gravity and the main surface derived from the spunbond nonwoven fabric is exposed. (Step 4) Drop one drop of distilled water onto the upper end of the exposed main surface of the sample from a position 12 cm above the upper end, and wait for the distilled water dropped onto the upper end to be absorbed by the sample. (Step 5) For a sample that has absorbed distilled water, measure the longest distance from the point on the main surface of the sample where the distilled water landed to the end of the portion of the main surface of the sample that was wet by the distilled water, on the side facing gravity, and define this as the water absorption distance. (Step 6) The water absorption distance is measured for each of the five samples, and the average of the water absorption distances obtained for each sample is calculated. Note that the shorter the calculated average, the better the liquid absorption performance of the surgical sheet.

[0091] The evaluation results showed that the surgical sheet prepared in Example 1 had superior liquid absorption performance compared to the surgical sheet prepared in Comparative Example 1.

[0092] (Example 2) The laminate was prepared in the same manner as in Example 1, except that the pressure of the water flow applied from the laminated web side was changed to 15 MPa. The prepared laminate consisted of a fiber layer derived from the laminated web and a spunbond nonwoven fabric as a cover material. The constituent fibers of the laminated web were interwoven into the spunbond nonwoven fabric, resulting in the spunbond nonwoven fabric and the water-entangled nonwoven fabric being laminated together as a single unit. Furthermore, as shown in Figure 2, the constituent fibers of the laminated web were present on the main surface derived from the spunbond nonwoven fabric. Subsequently, the laminate is cut into rectangular shapes with dimensions of 320 cm in the transport direction when subjected to water entanglement treatment, and 210 cm in the direction perpendicular to the transport direction, and used as surgical sheets (basis weight: 50 g / m²). 2 A sample with a thickness of 0.5 mm was prepared.

[0093] The surgical sheet prepared in Example 2 was subjected to the (Method for Evaluating Water Absorption) described above to evaluate the liquid absorption performance of the surgical sheet. As a result of the evaluation, the surgical sheet prepared in Example 2 had superior liquid absorption performance compared to the surgical sheets prepared in Comparative Example 1 and Example 1.

[0094] Furthermore, the surgical sheets prepared in Example 1 and Example 2 were subjected to the following (Method for Evaluating Resistance to Delamination) to evaluate the resistance to delamination between the cover material and the fiber layer exhibited by the surgical sheets.

[0095] (Method for evaluating the likelihood of delamination) (Step 1) Prepare two strips of adhesive tape (long side: 30 cm, short side: 5 cm). Also, take a strip of sample (long side: 10 cm, short side: 5 cm) from the surgical sheet, ensuring that the long side opposite to the direction in which the sample was transported during the water entanglement treatment is parallel to the sheet. (Step 2) Next, attach the portion of the first adhesive tape from one end to the other, up to 10 cm, onto one main surface of the sample derived from the spunbond nonwoven fabric. Similarly, attach the portion of the second adhesive tape from one end to the other, up to 10 cm, onto the other main surface of the sample derived from the water-entangled nonwoven fabric. At this time, ensure that when viewed from one main surface side of the sample, the two adhesive tapes protruding from the sample completely overlap. To prevent the portions of the adhesive tapes not attached to the sample from adhering, attach release paper to the portions of the adhesive tapes not attached to the sample. (Step 3) The left hand held the portion of the first adhesive tape that was not attached to the sample, and the right hand held the portion of the second adhesive tape that was not attached to the sample. Then, while maintaining this position, the force required to peel the spunbond nonwoven fabric from the sample was evaluated by separating the left and right hands in a left-right direction. Note that the greater the force required to peel it off, the stronger the lamination and integration of the water-entangled nonwoven fabric and the spunbond nonwoven fabric.

[0096] The evaluation results showed that the surgical sheet prepared in Example 2 had a stronger lamination and integration of the water-entangled nonwoven fabric and the spunbond nonwoven fabric compared to the surgical sheet prepared in Example 1.

[0097] (Example 3) In Example 2, a fiber entanglement treatment was performed by spraying a water stream at a pressure of 13 MPa onto the main surface side derived from the spunbond nonwoven fabric of the laminate prepared in Example 2. The laminate prepared in this manner consisted of a laminated web fiber layer and a spunbond nonwoven fabric cover material. The constituent fibers of the laminated web were interwoven into the spunbond nonwoven fabric, resulting in the spunbond nonwoven fabric and the water-entangled nonwoven fabric being laminated and integrated. Furthermore, the constituent fibers of the laminated web were present on the main surface derived from the spunbond nonwoven fabric. Of the constituent fibers of the laminated web present on the main surface derived from the spunbond nonwoven fabric, 35 out of 100 fibers had their ends exposed on the main surface derived from the spunbond nonwoven fabric. In this case, of the remaining 65 out of 100 fibers, one end was interwoven into the spunbond nonwoven fabric as shown in Figure 3, while the other end of the same fiber was present within the fiber layer derived from the laminated web. Subsequently, the laminate is cut into rectangular shapes with dimensions of 320 cm in the transport direction when subjected to water entanglement treatment, and 210 cm in the direction perpendicular to the transport direction, and used as surgical sheets (basis weight: 50 g / m²). 2 A sample with a thickness of 0.5 mm was prepared.

[0098] The surgical sheet prepared in Example 3 was subjected to the (method for evaluating water absorption) described above to evaluate the liquid absorption performance of the surgical sheet. The evaluation results showed that the surgical sheet prepared in Example 3 had superior liquid absorption performance compared to the surgical sheets prepared in Comparative Example 1 and Examples 1-2.

[0099] Furthermore, the surgical sheet prepared in Example 3 was subjected to the aforementioned (method for evaluating resistance to delamination) to evaluate the resistance to delamination between the cover material and the fiber layer exhibited by the surgical sheet. The evaluation results showed that the surgical sheet prepared in Example 3 had a stronger lamination and integration of the water-entangled nonwoven fabric and spunbond nonwoven fabric compared to the surgical sheets prepared in Examples 1 and 2.

[0100] Furthermore, the degree of fuzziness present on the main surface of the surgical sheets prepared in Examples 2 and 3 was confirmed by visual inspection and touch. Upon verification, it was found that the surgical sheet prepared in Example 3 had less fuzz on its main surface than the surgical sheet prepared in Example 2.

[0101] (Example 4) In the laminate prepared in Example 1, molten polyolefin-based hot melt resin was applied to the entire surface of the main surface derived from the water-entangled nonwoven fabric (application amount: 3 g / m²). 2 Next, a molten polyolefin-based hot melt resin was placed in between, and a polyethylene film (basis weight: 18g / m²) was placed in between. 2 A laminate with a film layer was prepared by bonding together two layers (with a thickness of 0.02 mm). Then, by allowing it to cool, a laminate with a film layer was prepared. Then, the laminate comprising the prepared film layer was cut into a rectangular shape having a length of 320 cm in the direction of transport of the water-entangled nonwoven fabric constituting the laminate, and a length of 210 cm in the direction perpendicular to the said transport direction. In this way, a rectangular laminate was created as a surgical sheet.

[0102] (Example 5) A surgical sheet was prepared in the same manner as in Example 4, except that the laminate prepared in Example 2 was used.

[0103] (Example 6) A surgical sheet was prepared in the same manner as in Example 4, except that the laminate prepared in Example 3 was used.

[0104] The surgical sheets prepared in Examples 4-6 were surgical sheets that, due to the presence of a film layer, prevented the liquid absorbed and retained by the fiber layer from leaking out to the film layer side of the surgical sheet.

[0105] (Example 7) Another spunbond nonwoven fabric (basis weight: 15g / m²) consisting of continuous fibers made of polypropylene resin mixed with blue pigment and a hydrophilic agent. 2 We prepared a sample with an average fiber diameter of 20 μm and a blue color. A laminate was prepared in which a laminated web and another spunbond nonwoven fabric were laminated together, in the same manner as in Example 3, except that a different spunbond nonwoven fabric was used instead of the first spunbond nonwoven fabric. The laminate prepared in this manner consisted of a fiber layer derived from the laminated web and another spunbond nonwoven fabric serving as a cover material. The constituent fibers of the laminated web were interwoven into the other spunbond nonwoven fabric, resulting in the lamination and integration of the other spunbond nonwoven fabric and the water-entangled nonwoven fabric. Furthermore, the constituent fibers of the laminated web were present on the main surface derived from the other spunbond nonwoven fabric. Of the constituent fibers of the laminated web present on the main surface derived from the other spunbond nonwoven fabric, 35 out of 100 fibers had their ends exposed on the main surface derived from the other spunbond nonwoven fabric. In this case, of the remaining 65 out of 100 fibers, one end was interwoven into the other spunbond nonwoven fabric as shown in Figure 3, while the other end of these fibers was present within the fiber layer derived from the laminated web. Subsequently, the laminate was cut into rectangular shapes with a length of 320 cm in the transport direction when subjected to water entanglement treatment, and a length of 210 cm in the direction perpendicular to the transport direction, to prepare surgical sheets (basis weight: 50 g / m2, thickness: 0.5 mm).

[0106] (Example 8) A surgical sheet was prepared in the same manner as in Example 4, except that the laminate prepared in Example 7 was used.

[0107] The surgical sheet prepared in Example 8 was a surgical sheet in which the presence of a film layer prevented the liquid absorbed and retained by the fiber layer from leaking out to the film layer side of the surgical sheet.

[0108] Furthermore, when the surgical sheets prepared in Examples 7 and 8 were visually inspected from the main surface side derived from another spunbond nonwoven fabric, the blue color of the surgical sheets was found to be uniform and without unevenness. [Industrial applicability]

[0109] The surgical sheet of the present invention can be suitably used as a covering for the human body (patient) during surgery, as well as as a cover or underlay for the operating table on which the patient lies, and as a covering or underlay for medical equipment to prevent contamination of medical equipment during surgery. [Explanation of Symbols]

[0110] 100... Surgical sheets 1. Fiber layer 2. Cover material 3. Constituent fibers of the fiber layer embedded in the cover material 10-Laminate 20...film layer 200... Another surgical sheet 4. Main surface on the cover material side in the laminate 3'...The portion of the constituent fibers of the fiber layer that has penetrated into the cover material that is present on the main surface. 300... yet another surgical sheet 3''...Among the constituent fibers of the fiber layer present on the main surface, the constituent fibers whose ends penetrate into the fiber layer and / or cover material.

Claims

1. A surgical sheet comprising a laminate in which a fiber layer and a permeable cover material are laminated and integrated, The constituent fibers of the fiber layer penetrate into the cover material, thereby laminating and integrating the cover material and the fiber layer. Surgical sheet.

2. The constituent fibers of the fiber layer are present on the main surface of the cover material side in the laminate. The surgical sheet according to claim 1.

3. The ends of the constituent fibers present on the main surface are embedded in the fiber layer and / or the cover material. The surgical sheet according to claim 2.

4. The aforementioned cover material has a color, The fiber layer has at least two directional fiber orientations in a direction parallel to the main surface of the fiber layer, or does not have a specific fiber orientation in a direction parallel to the main surface of the fiber layer. The surgical sheet according to claim 1.

5. The laminate includes a film layer on the fiber layer side, A surgical sheet according to any one of claims 1 to 4.

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