MEDICAL NURSING PAD FOR PREVENTING BEDSORES

Abstract

The present invention provides a medical nursing pad for preventing bedsores. The medical nursing pad comprises a surface layer, a core body layer and a bottom layer. The core body layer has a fluff pulp and a super absorbent polymer material, and is covered by toilet paper. A dotted SAP is distributed on the core body layer. The SAP absorbs and retains an infiltrating liquid in an inversely funnelled SAP absorption region in the core body layer to minimize the reverse osmosis amount of the liquid absorbed by the medical nursing pad. Meanwhile, vapour separated from the liquid reaches the bottom layer through a longitudinal vapour channel formed by a gap among fluff pulp fibres with a certain density range in the core body layer, and is expelled from the medical nursing pad through a nanoscale breathable micro-pore on the bottom layer.

Claims

1. A medical nursing pad for preventing bedsores, comprising: a surface layer, composed of a soft hydrophilic spun-bonded nonwoven fabric; a core body layer, comprising a fluff pulp and a super absorbent polymer material, and is covered by toilet paper; and a bottom layer, adopting a micro-porous breathable composite membrane; wherein a dotted SAP (Super Absorbent Polymer) is inversely funnelled, distributed on the core body layer, and applied onto the core body layer to form a plurality of inversely funnelled absorption regions, each of groove units surrounded by multiple dotted SAPs serves as an absorption region, adjacently distributed absorption regions are connected to form an SAP-free fluff pulp fibre region functioning for diversion, and a plurality of inversely funnelled diversion regions are formed relative to the absorption regions.

2. The medical nursing pad for preventing bedsores according to claim 1, wherein the dotted SAPs surround to form a hexagonal, octagonal, circular or polygonal combination.

3. The medical nursing pad for preventing bedsores according to claim 2, wherein a dotted SAP accumulation body is distributed hexagonally, wherein each dotted SAP material is shaped like a hexagon, six accumulation bodies composed of the dotted SAP material form a small SAP combination, and six small SAP combinations form a big SAP combination.

4. The medical nursing pad for preventing bedsores according to claim 3, wherein the dotted SAP is 1 mm to 3 mm in height, and 3 mm to 10 mm in diameter.

5. The medical nursing pad for preventing bedsores according to claim 4, wherein the density of the core body layer of the medical nursing pad ranges from 0.10 g/cc to 0.4 g/cc.

6. The medical nursing pad for preventing bedsores according to claim 5, characterized in that the gram weight of the toilet paper ranges from 12 g/m.sup.2 to 28 g/m.sup.2.

7. The medical nursing pad for preventing bedsores according to claim 6, wherein the core body layer is a single-layer core body layer, or a double-layer core body layer, or a multilayer core body layer.

8. The medical nursing pad for preventing bedsores according to claim 7, wherein the fluff pulp on the upper core body layer accounts for a larger percentage than that on the lower core body layer.

9. The medical nursing pad for preventing bedsores according to claim 8, wherein the SAP on the lower core body layer accounts for a larger percentage than that on the upper core body layer.

10. The medical nursing pad for preventing bedsores according to claim 9, wherein the absorption region occupies 5% to 30% the area of the core body layer.

11. The medical nursing pad for preventing bedsores according to claim 10, wherein the diversion region occupies 30% to 95% the area of the core body layer.

12. The medical nursing pad for preventing bedsores according to claim 11, wherein the gram weight of the spun-bonded nonwoven fabric ranges from 12 g/m.sup.2 to 28 g/m.sup.2.

13. The medical nursing pad for preventing bedsores according to claim 12, wherein the gram weight of the micro-porous breathable composite membrane ranges from 20 g/m.sup.2 to 60 g/m.sup.2.

14. The medical nursing pad for preventing bedsores according to claim 13, wherein the particle size of the SAP is 80 to 140 meshes.

15. The medical nursing pad for preventing bedsores according to claim 14, wherein the pH value of the SAP is 6 to 8.

16. A method for fabricating the medical nursing pad for preventing bedsores according to claim 1, comprising a dotted SAP applying method, and the dotted SAP applying method comprises: using an SAP hopper stores SAP particles; making the SAP particles fall to the outer surface of an SAP applying roller under the action of gravity; using a conveyer belt mechanism to drive a fluff pulp fibre to move forwards; when the fluff pulp fibre is moved forwards, rotating the SAP applying roller; and making SAPs contained in dotted SAP applying roller pits that are uniformly distributed on the outer surface of the SAP applying roller fall along with the rotation of the dotted SAP applying roller, and thus a dotted SAP pile is formed on the fluff pulp fibre; wherein the SAP applying roller is a cylindrical roller made of stainless steel or alloy steel, the pits are uniformly arranged on the outer surface of the SAP applying roller, and the pits are used for storing the SAP in the SAP applying roller, and are made by laser engraving.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can realize the present invention.

[0039] FIG. 1 is a schematic diagram of a medical nursing pad according to an embodiment of the present invention.

[0040] FIG. 2 is a schematic diagram of a dotted SAP application according to an embodiment of the present invention.

[0041] FIG. 3 is a schematic diagram of pits on the outer surface of an SAP applying roller according to an embodiment of the present invention.

[0042] FIG. 4 is an enlarged schematic diagram of a pit on the outer surface of an SAP applying roller according to an embodiment of the present invention.

[0043] FIG. 5 is a schematic diagram of SAP distribution according to an embodiment of the present invention.

[0044] FIG. 6 is a schematic diagram of liquid spreading on a core body layer according to an embodiment of the present invention.

[0045] FIG. 7 is a schematic diagram of diversion of a double-layer core body layer according to an embodiment of the present invention.

[0046] FIG. 8 is a schematic diagram of diversion of a multilayer core body layer according to an embodiment of the present invention.

[0047] FIG. 9 is a structural schematic diagram of a micro-porous composite breathable membrane according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can realize the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

[0049] It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Thus, a first element could be termed a second element without departing from the teachings of the invention.

[0050] In FIG. 1, according to a schematic figure of breathability of a medical nursing pad in an embodiment of the present invention, a liquid 14 infiltrates into a core body layer 12 from a spun-bonded nonwoven fabric 11. After the liquid 14 enters into the core body layer 12, the liquid 14 can transversely spread within 360 degrees along the circumference in the core body layer 12, and that is, the core body layer 12 forms a funnelled absorption region. When the liquid 14 spreads, the liquid 14 is absorbed and retained by a dotted SAP distributed in the core body layer 12. The water vapour 15 in the core body layer 12 is expelled through a longitudinal vapour channel reserved in the design of the core body layer 12 and by the breathable function of a composite breathable membrane on a bottom layer 13, thereby ensuring that the medical nursing pad is dry, comfortable and breathable, and achieving the purpose of preventing bedsores.

[0051] The following will describe the specific embodiments of the present invention in detail.

[0052] It is known that any medical nursing pad is composed of three parts, a surface layer, a core body layer and a bottom layer. For the medical nursing pad for preventing bedsores provided by the present invention, a core body layer is disposed between its surface layer and bottom layer, and the core body layer is composed of a fluff pulp fibre and an SAP, which are mixed and covered by toilet paper. The difference between the present invention and prior art is that, a dotted inversely funnelled SAP is applied onto the fluff pulp fibre in the core body layer by an SAP applying roller. Each dotted inversely funnelled SAP unit can be considered as an absorption region. Adjacently distributed absorption regions can be connected to form an SAP-free fluff pulp fibre region. The SAP-free fluff pulp fibre region is mainly composed of the fluff pulp fibre and plays a major role in diversion, and it is called a diversion region being inversely funnelled relative to the absorption region.

[0053] The application principles of the dotted inversely funnelled SAP are illustrated as follows. See FIG. 2, the dotted SAP application is shown. An SAP hopper 21 stores SAP particles, and the SAP particles fall to the outer surface of an SAP applying roller 22 under the action of gravity. A conveyer belt mechanism 23 drives a fluff pulp fibre 24 to move forwards. When the fluff pulp fibre 24 is moved forwards, the SAP applying roller 22 is rotated. Then SAPs contained in dotted funnelled SAP applying roller pits 25 that are uniformly distributed on the outer surface of the SAP applying roller 22 fall along with the rotation of the dotted SAP applying roller 22, and a dotted funnelled SAP 26 pile is formed on the fluff pulp fibre 24.

[0054] See FIG. 3, the SAP applying roller 31 is a cylindrical roller made of stainless steel or alloy steel, and the pits 32 are uniformly arranged on the outer surface of the SAP applying roller 31. The pits 32 are used for storing an SAP in the SAP applying roller 31, and are made with high dimensional accuracy and smooth surface by laser engraving. Meanwhile, with high hardness, the stainless steel or alloy steel is suitable for use under a long-wear condition.

[0055] These pits can be better illustrated with reference in FIG. 4, which is the enlarged schematic diagram of a pit on the outer surface of an SAP applying roller, wherein a bottom surface 41 of the pit is located on the bottom of a side surface 42 of the pit, and an upper side 43 of the pit is above the side surface 42 of the pit. The pit can be of any equilateral or inequilateral shape, like hexagon, octagon or circle. It is recommended to be an equilateral hexagon as hexagon is more suitable for liquid diversion than other shapes, and a hexagonal SAP accumulation body can absorb the liquid more rapidly. The pit can be 1 mm to 3 mm in depth, and 3 mm to 10 mm in diameter. The SAP volume is determined according to the needed absorptive amount of the medical nursing pad. The present invention is not intended to be limited to a specific volume range, but only to suggest the depth and diameter range of the pit, and such pit form is intended to be protected by the present invention.

[0056] As hexagon is more suitable for liquid diversion than other shapes, the SAP accumulation body is also distributed hexagonally, as shown in FIG. 5, wherein an accumulation body made of an SAP material 51 can be distributed in a small hexagon, six accumulation bodies made of the SAP material 51 can form a small SAP combination 52, and six small combinations 52 of the SAP material can form a big SAP combination 53. The SAP distribution is reasonable, but combinations of other shapes can also be adopted. The hexagonal combination of the present invention does not imply that the present invention may not include combinations of other shapes.

[0057] The absorption region occupies 5% to 30%, preferentially 15% to 20% the area of the core body layer. On the contrary, the diversion region occupies 30% to 95%, preferentially 80% to 85% the area of the core body layer. The significance of this definition is clear. Any product serves the society more effectively only when their industrial production is realized. What is the most important is a high performance cost ratio, which shows tangible benefits to consumers and enables them to be able to afford and feel relieved to use. Therefore, the design of the medical nursing pad shall make full consideration of the affordability of consumers, and the designers must primarily consider a lower product cost under the prerequisite of ensured product functions. The use of the combination of the pits, especially the hexagonal combination of the pits, meets these requirements. The pits and their combination design are most satisfactory to product functions, and minimize the manufacturing cost of the product.

[0058] It is known that, the fluff pulp is a principal part of the core body layer of the medical nursing pad. The fluff pulp fibres composing the core body layer of the medical nursing pad are irregularly transversely arranged. When the density of the core body layer of the medical nursing pad is within a certain range, there are a plurality of gaps among the irregularly arranged fluff pulp fibres, which can provide a longitudinal channel for water and water vapour. It is understandable that when the density of the core body layer of the medical nursing pad is relatively large, and the channel among the fluff pulp fibres in the core body layer of the medical nursing pad is narrowed. On the contrary, when the density of the core body layer of the medical nursing pad is relatively small, the channel among the fluff pulp fibres in the core body layer of the medical nursing pad is widened, water and vapour can smoothly pass through the gaps of the fluff pulp fibres and reach the bottom of the core body layer of the medical nursing pad close to the micro-porous composite breathable membrane, and the vapour can be expelled through the micro-porous composite breathable membrane. As for the medical nursing pad for preventing bedsores provided by the present invention, as shown above, the density of the core body layer of the medical nursing pad is an important indicator of the present invention. When the density of the core body layer of the medical nursing pad is within a certain range, the out-of-order fluff pulp fibres can build a plurality of gaps and form a vapour channel for water vapour.

[0059] As for the medical nursing pad for preventing bedsores provided by the present invention, the density of the fluff pulp fibres in the core body layer is an important indicator of the present invention. If the density of the fluff pulp fibres in the core body layer of the medical nursing pad is small, the absorption speed and total absorptive amount of the liquid can be improved, but the spreading speed of the liquid will be reduced and the reverse osmosis amount will be increased. If the density of the fluff pulp fibres in the core body layer of the medical nursing pad is increased, the spreading of the liquid can be facilitated. The suitable density of the core body layer of the medical nursing pad of the present invention is determined to be 0.10 g/cc to 0.4 g/cc, preferentially, 0.15 g/cc to 0.25 g/cc. The medical nursing pad with such density range can ensure the building of the vapour channel in the medical nursing pad product while maintaining the capacities of liquid absorption and storage as well as rapid water retaining. Thus, it is conducive for the passing and expelling of the water vapour from the medical nursing pad to keep the medical nursing pad dry, comfortable and breathable, and the friction between the product and the skin can be reduced to make the user comfortable, thereby achieving the purpose of the present invention for preventing bedsores.

[0060] The fluff pulp fibres are wood pulp or straw pulp treated by bleaching and removing organic solvents, and so on. Alternatively, the fluff pulp fibres are paper pulp used as a water absorbing medium for the production of various sanitary products (for example, sanitary towels, baby diapers and mattresses of hospital, etc.). Compared with ordinary pulp sheets, a fluff pulp sheet has longer fibres and larger fibre strength, and is likely to be kneaded into filaments on a napping machine during the production of fluff pulp products like sanitary towels, with less dust caused during processing and fluffing. The fluff pulp products are good for water absorption and rapid for spreading, and the fluff pulp fibres have high whiteness, softness, certain elasticity and better core and pad integrity, and are compliant with specified hygienic indexes. After being bleached, the fluff pulp fibres have softness, high filling power, coarse and long fibres, low fines content, good integrity, even reticular fibres, and high adhesive force to the SAP. They have good vapour absorption time, speed and amount under proper density conditions.

[0061] With even length, good integrity and well designed density, the irregularly transversely arranged fluff pulp fibres form an efficient diversion region, and the liquid rapidly transversely spreads all around within 360 degrees in the core body layer, and is absorbed and retained by the SAP in the inversely funnelled absorption region. Thus, the medical nursing pad realizes the function of rapidly absorbing and firmly retaining water. With such design, the medical nursing pad minimizes the reverse osmosis amount after absorbing the liquid, and the liquid can transversely spread within 360 degrees along the circumference after entering into the core body layer. See FIG. 6, FIG. 6 shows the liquid spreading on a core body layer. After a water drop 63 enters into the medical nursing pad, it is diverted by the fluff pulp 61 to transversely spread within 360 degrees. The spreading liquid is absorbed and retained by the SAP 62 in the core body layer, and the vapour in the medical nursing pad longitudinally infiltrates along the medical nursing pad until it reaches the micro-porous breathable composite membrane. The vapour is then expelled from the medical nursing pad through the micro-pores on the micro-porous breathable composite membrane. During the process, an inversely funnelled absorption region is formed, which is a characteristic of the product of the present invention.

[0062] A double-layer core body layer absorbs more quickly, as described in detail below. For example, the core body layer can be a double-layer core body layer. See FIG. 7, the use of a double-layer core body layer can speed up the transverse spreading of the liquid. The double-layer core body layer can be provided with a fluff pulp and an SAP with different proportions. An upper core body layer 71 can properly increase the fluff pulp proportion to realize a major function of diverting water 73, and a lower core body layer 72 can properly increase the SAP proportion to realize a major function of absorbing and retaining water 74. Obviously, a funnelled absorption region is formed on the double-layer core body layer after the core body layer is disposed. It has the positive effects of enabling water to spread rapidly and rapidly absorbing and retaining liquid, and besides, the funnelled shape can minimize the reverse osmosis amount of the liquid, thereby achieving the purpose of keeping the medical nursing pad dry and comfortable.

[0063] It is understandable that the present invention can be a single-layer core body layer, a double-layer core body layer or even a multilayer core body layer. The larger the number of layers, the better the dryness and comfort of the product, but any of these core body layers shall fall within the protection scope of the present invention.

[0064] See FIG. 8, take a four-layer core body layer as an example, a multilayer core body layer can better speed up the transverse spreading of the liquid. The multilayer core body layer can be provided with a fluff pulp and an SAP with different proportions. A first core body layer 81 can properly increase the fluff pulp proportion to realize a major function of rapidly diverting water 88. A second core body layer 82 can properly increase the SAP proportion to realize a major function of absorbing and retaining water 85 while diverting. A third core body layer 83 can continuously increase the SAP proportion to realize a major function of substantially absorbing and retaining water 86 while slowly diverting. A fourth core body layer 84 is basically made of an SAP material, and has a major function of absorbing and retaining water 87. Obviously, a funnelled absorption region is formed on the multilayer core body layer after the core body layer is disposed. It has the positive effects of enabling water to spread rapidly and rapidly absorbing and retaining liquid, and besides, the funnelled shape can minimize the reverse osmosis amount of the liquid, thereby achieving the purpose of keeping the medical nursing pad dry and comfortable.

[0065] As a high polymer absorbent material, the SAP can absorb water that is more than ten times of its weight. As the SAP has a strong water retention capacity, it is also known as a super water absorbent or super water retention agent, a low-crosslinked or partially-crystallized macromolecular polymer with many hydrophilic groups. It is mainly used as a raw material for sanitary towels and diapers in the health field, and it is well known in the industry that the SAP has a strong water retaining capacity.

[0066] The SAP of the present invention is 80 to 140 meshes in particle size and 6 to 8 in pH value. It is because that smaller SAP particles may have a negative impact on the absorption speed and reverse osmosis, and may block the vapour channel or gap of the medical nursing pad. According to the experimental data of the industry, the water absorption and retaining capacity of the SAP is the best when its particle size is 100 to 120 meshes, and the absorption speed is the largest when the pH value is 6 to 8. Therefore, the present invention adopts the SAP with a particle size of 80 to 140 meshes to keep the vapour channel smooth in the core body layer of the medial nursing pad without being blocked by the SAP, thereby achieving the purpose of optimal water retaining.

[0067] It is well known in the industry that a medical nursing pad has a requirement for a pH value, and that is, urine and sweat from a patient can be effectively neutralized. Meanwhile, it is widely understood that an object of neutral pH value is more comfortable to human skin when it touches the human body.

[0068] The fluff pulp and the SAP in the core body layer of the present invention are covered by toilet paper. It is because the covering toilet paper can reduce the friction between the product and the skin, and facilitate the high speed industrial production of the medical nursing pad, and the toilet paper with good breathability will not impair the breathability of the medical nursing pad of the present invention. The gram weight of the toilet paper selected by the present invention ranges from 12 g/m.sup.2 to 28 g/m.sup.2, preferentially from 17 g/m.sup.2 to 21 g/m.sup.2.

[0069] The core body layer of the present invention adopts dotted embossing, which is designed to fix the core body structure, and maintain the integrity of the core body after vapour absorption. The dotted embossing may be in the form of a pattern, a text, or a combination of both, within the permitted scope of the present invention.

[0070] From the above, the present invention adopts soft fluff fibres with high filling power. The soft fluff fibres are coarse and long fibres. The SAP with a particle size of 80 to 140 meshes is added into the fluff pulp fibres with a density of 0.10 g/cc to 0.4 g/cc, thus building a vapour channel in the core body layer of the medical nursing pad. The water vapour in the medical nursing pad is expelled from the medical nursing pad through the micro-porous breathable composite membrane via the vapour channel, thereby maintaining the water retaining and breathable functions of the medical nursing pad of the present invention, and achieving the purpose of preventing bedsores.

[0071] The medical nursing pad of the present invention is composed of a surface layer, a bottom layer and a core body layer between the surface layer and the bottom layer. The absorption rate of the medical nursing pad of the present invention is not greater than 300 s, and the reverse osmosis amount is not greater than 15 g, which is necessary for the special liquid storage and absorption and rapid water retaining capacities of the medical nursing pad of the present invention.

[0072] The medical nursing pad for preventing bedsores provided by the present invention may further comprise the following contents.

[0073] In the medical nursing pad for preventing bedsores, a surface layer is composed of a soft nonwoven fabric, which has a function of enabling absorbed water to infiltrate quickly. To realize the function, the present invention adopts a hydrophilic spun-bonded nonwoven fabric, which is made by laying continuous filaments that come from extruded and stretched polymers into a web and treating the fibre web by self-bonding, heat bonding, chemical bonding or mechanical strengthening.

[0074] The hydrophilic spun-bonded nonwoven fabric is produced by adding a hydrophilic agent in the production process of the nonwoven fabric or adding it onto a fibre during fibre production. The hydrophilic agent is added as the fibre or nonwoven fabric composed of macromolecular polymers has few or non-hydrophilic groups and cannot provide necessary hydrophilic performance for nonwoven fabric application. The hydrophilic nonwoven fabric features a certain water absorption capacity, and is largely applied to medical products and sanitary care articles. The hydrophilic nonwoven fabric can rapidly transfer the liquid into the core body layer, and features small friction, high resistance to elevated temperatures, aging resistance, UV resistance, high elongation, good stability and breathability, resistance to corrosion, noise and moth, and non-toxicity. It can not only ensure the breathability of the present invention, but also be corrosion-resistant and non-toxic, thereby realizing the dry, comfortable and breathable performance of the product of the present invention, and meeting the requirements of keeping the skin clean and comfortable, etc. Besides, as the hydrophilic nonwoven fabric has the function of enabling water to rapidly infiltrate, the liquid can abruptly reach the core body layer of the medical nursing pad, thus keeping the surface of the medical nursing pad dry and comfortable. Therefore, the spun-bonded nonwoven fabric adopted by the present invention is soft, dry, comfortable and small in friction, and can greatly improve the comfort of the patient using it.

[0075] According to the operating requirements of the present invention, the gram weight of the hydrophilic spun-bonded nonwoven fabric ranges from 12 g/m.sup.2 to 28 g/m.sup.2, preferentially from 17 g/m.sup.2 to 21 g/m.sup.2. The gram weight range is selected according to the operating requirements of the medical nursing pad of the present invention. Within the gram weight range, the medical nursing pad of the present invention can keep good dry, comfortable, breathable and small friction features, thus achieving the purpose of being comfortable to the patient using it.

[0076] In a medical nursing pad for preventing bedsores provided by the present invention, a bottom layer adopts a micro-porous composite breathable membrane. The micro-porous composite breathable membrane is a new material. Due to the unique breathable performance of the micro-porous composite breathable membrane, water vapour can be rapidly expelled from the medical nursing pad to prevent the thriving of bacteria in the medical nursing pad. Therefore, it is a healthy and environment-friendly new material.

[0077] The micro-porous composite breathable membrane is also known as a “waterproof breathable micro-porous composite membrane”, having breathable and watertight features. It is composed of two materials, an upper micro-porous breathable membrane and a lower water-repellent spun-bonded nonwoven fabric, as shown in FIG. 9. A hot melt glue 92 between the micro-porous breathable membrane 91 and the water-repellent spun-bonded nonwoven fabric 93 glues the two materials to form the waterproof breathable micro-porous composite membrane.

[0078] The micro-porous composite breathable membrane is so disposed to maintain its breathable and watertight features and improve the friction of the bottom membrane as well as the tensile strength of the bottom layer of the medical nursing pad.

[0079] The upper layer of the micro-porous composite breathable membrane is the micro-porous breathable membrane. The upper layer has a lot of interconnected micro-pores. The diameter of the micro-pores is very small (about 0.01 to 10 μm), which is accessible to only water vapour molecules having a particle size of about 0.4 nm, and is too large for any liquid or water drops to pass through. In this way, the water vapour from the medical nursing pad can effectively spread outwards through the micro-pore diameter while the water drops cannot infiltrate, thus achieving the waterproof and vapour-breathable effects.

[0080] The micro-porous breathable membrane has the following principles. PE is used as a substrate, PE+CaCO3+ is used as an additive, and an inorganic filler (such as colour master batch, anti-oxygen, calcium carbonate and talcum powder) is added into the raw material. During the stretching process, the junction of the inorganic filler particles (1 to 10 μm) and the plastic film substrate under shaping is melt and extruded to form micro-pores. The micro-pores build an air channel, which realizes the breathable and watertight performance of the thin membrane.

[0081] According to the above principles, after the micro-porous composite breathable membrane is treated in that way, thousands of nanoscale breathable micro-pores are distributed on the thin membrane per square centimetre. The micro-pores have a special structure, which can not only prevent liquid leakage, but also help water vapour molecules pass quickly, thereby realizing the breathable and waterproof functions, and making the skin of a patient using the medical nursing pad dry and conformable.

[0082] The lower layer of the micro-porous composite breathable membrane is the water-repellent spun-bonded nonwoven fabric. The water-repellent principles of the water-repellent spun-bonded nonwoven fabric lie in a finishing agent with low surface tension, with which the surface tension of the nonwoven fabric is far lower than that of water. Thus, the surface of the nonwoven fabric has a water-repellent effect, and the nonwoven fabric can continuously maintain good breathability. A necessary condition for the water-repellent spun-bonded nonwoven fabric to realize its water-repellent performance is that the critical surface tension of the nonwoven fabric material is less than the surface tension of the liquid (for example, water and urine, etc.). The technological process is: preparing a finishing working liquid.fwdarw.treating the nonwoven fabric by the finishing liquid.fwdarw.drying.fwdarw.curing.fwdarw.water-repelling material. The finishing liquid may be paraffin, organic silicon or fluorine-containing resins.

[0083] Specifically, the spun-bonded nonwoven fabric adopted by the present invention has an important role of improving the friction of the micro-porous composite breathable membrane as the friction of the spun-bonded nonwoven fabric is far greater than the PE membrane and the composited micro-porous breathable membrane has much higher tensile strength than a single-layer micro-porous breathable membrane. The spun-bonded melt-blown (SMS and SMMS) water-repellent nonwoven fabric features low gram weight, high strength and extension, high breathability, and strong water repellence. The product has good evenness and high opaqueness. The spun-bonded layer is composed of continuous filaments, and has good breaking strength and elongation; the melt-blown layer is composed of continuous superfine fibres, and has a good shielding effect for water, bacteria and dust, and so on. The nonwoven fabric has very high resistance to water pressure, good breathability and good acid and alkali resistance, and can display different colours. The nonwoven fabric can be used for operating coats, surgical drapes, wound care, protective garments, caps and masks in the medical industry, and can also be used for the side leakage prevention edges of baby and adult diapers in the health field. It is also commonly known in the industry, and will not be described in detail herein.

[0084] The composited upper micro-porous breathable membrane and lower water-repellent spun-bonded nonwoven fabric of the micro-porous composite breathable membrane have already been disclosed in the industry. A more advanced technology for compositing the two materials on line has also been disclosed in the industry. For example, the technology has been described in detail in the “Composite Bottom Membrane Applying Device for Disposable Absorptive Product Nursing Pad” in a patent CN103832043A, and will not be described herein.

[0085] The disposable medical nursing pad of the present invention is produced by using the micro-porous breathable composite membrane. It has special performance, such as excellent leakage prevention performance and breathability, high tensile strength, and comfort and softness, and is free from the waxy feel of ordinary cast films.

[0086] According to the operating requirements of the present invention, the gram weight of the micro-porous breathable composite membrane on the bottom layer of the medical nursing pad ranges from 20 g/m.sup.2 to 60 g/m.sup.2, preferentially from 32 g/m.sup.2 to 48 g/m.sup.2. The gram weight range is selected according to the operating requirements of the medical nursing pad. Within the gram weight range, the micro-porous breathable composite membrane of the medical nursing pad of the present invention can realize a water vapour transmission rate (WVTR) not less than 1600 g/m.sup.2*24 h, which meets the breathability requirement of the present invention for effectively preventing bedsores.

[0087] According to the ASTM E96 standard of the American Society for Testing and Materials (ASTM), formerly the International Association for Testing Materials (IATM), the water vapour transmission rate refers to the total amount of water vapour that transmits through a sample per unit time per unit area, wherein the transmission direction is vertical to a certain surface of the sample. All the surfaces of the sample have certain temperature and humidity. A common unit is g/m.sup.2*24 h.

[0088] The medical nursing pad for effectively preventing bedsores in the present invention adopts a breathability test method, namely a water vapour inverted cup method, which is a method for testing the breathability of the medical nursing pad according to the ASTM E96 standard of the American Society for Testing and Materials, as follows.

[0089] The test principles comprise: covering a vapour-breathable cup filled with distilled water with a tested fabric, fixing and then inverting the cup, weighing the cup with a top loading balance with the accuracy of 0.001 g, and emplacing it in a position in a bleed wind tunnel; recording the ambient temperature and relative humidity before weighing the cup in an environmental chamber with temperature of 23° C., relative humidity of 50% and air speed of 2.5 m/s; recoding both the cup weight and weighing time; recording the weight at the time of 3 h, 6 h, 9 h, 13 h, 23 h, 26 h and 30 h, and calculating the water vapour transmission rate according to the formula of WVT=24*Δm/(s*t); using the mean value of the six samples as a test result, and multiplying the mean value by 24 to form a result in the unit of g/m2*24 h.

[0090] Further, there is a simple test method, using about 80° C. of hot water as a reagent and four transparent glass cups as instruments, and comprising the following steps: 1. preparing four identical transparent glass cups, and fully filling two of them with hot water; 2. respectively emplacing the two hot water glass cups beneath the medical nursing pad of the present invention and a different medical nursing pad, wherein the bottom layers of the medical nursing pads are upturned, and finally respectively covering them with the dry glass cups; 3. after letting them stand for 5 min, it can be seen that if the product is breathable, there is water vapour reaching the surface layer of the medical nursing pad and condensing into water drops on the wall of the cup, and if the product is not breathable, there are no water drops.

[0091] While the means of specific embodiments in present invention has been described by reference drawings, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims. The modifications and variations should in a range limited by the specification of the present invention.