KR100631106B1 - Foam dressings with bonded net films - Google Patents

Abstract

The present invention relates to a fillable foam dressing material for use in fine wounds, and more particularly to a dressing material that improves the physical properties of the hydrophilic foam due to swelling after absorbing the exudates. The present invention provides a filling-type foam dressing material in which the net-type film 20 is bonded to the surface of the hydrophilic foam 10 so as to have enhanced physical properties. The Net shape includes a shape consisting of a straight line, a curve, a circle, an ellipse, a polygon, or a combination thereof. Net-type film 20 has various shapes and thicknesses according to the characteristics of the hydrophilic foam 10, and a net-shaped joint portion in which exudates are absorbed through the non-bonded portion 22 and connected continuously ( 25) compensates for the problem that the hydrophilic foam 10 is torn or broken by reinforcing the physical properties of the hydrophilic foam 10 due to swelling when the dressing material is replaced.

Filling, Hydrophilic Foam, Dressing Materials, Net Film, Polyurethane

Description

Foam dressing with net patterned film attached equivalent}             

1 is a perspective view of a foam dressing material according to the present invention, showing a double-sided bonded foam dressing material.

2 is a cross-sectional view of FIG. 1.

Figure 3 is a cross-sectional view of the foam dressing material according to the present invention, showing a one-sided bonded foam dressing material.

Figure 4 is a plan view of the foam dressing material according to the present invention, showing a state in which the film is bonded to have a non-bonded portion of a circular shape.

Figure 5 is a plan view of the foam dressing material according to the present invention, showing a state in which the film is bonded in a straight form.

Figure 6 is a plan view of the foam dressing material according to the present invention, showing a state in which the film is bonded in a continuous curve form.

<Description of Symbols for Main Parts of Drawings>

10 hydrophilic foam 20 film

22: non-bonded portion of the film 25: bonded portion of the film

t: thickness of film

The present invention relates to a filling-type foam dressing material mainly used for fine wounds, and more particularly, by bonding a net-type film to a hydrophilic foam to improve physical properties of the hydrophilic foam due to swelling after absorbing exudates. A fill foam dressing material.

Skin is an organ that performs important functions such as body protection, temperature control, bacterial infection prevention, perception, and secretion. When the skin is lost due to various wounds, wounds, burns, bedsores, etc. Torture, and even extensive damage, even life threatening. In order to expedite the healing of wounds and to minimize secondary side effects, it is necessary to use wound dressings.

In particular, in wounds with a large amount of effusion, such as fine wounds such as cavities, pockets, bedsores, etc., a dressing material capable of free deformation according to the shape of the wound and having excellent effluent absorption ability is required. Here, the excellent effluent absorption ability means that the effluent absorption rate is fast and the effluent absorption is high.

In general, dressing materials mainly used for fine wounds include gauze dressing materials and hydrophilic polyurethane foam dressing materials. However, the gauze dressing material has a high absorption rate of wound secretion, but it has low absorption and delays the treatment by keeping the wound dry, and the dressing material adheres to the wound surface, making it difficult to exchange and accompanying damage and pain of new tissue. Etc. In addition, in the early stages of healing, a large amount of exudate is generated, and the low absorbency gauze dressing material has to be replaced several times a day. In addition, the conventional filled hydrophilic polyurethane foam dressing material has an excellent absorbency and has the advantage of maintaining proper wet state and non-adhesive property of the wound surface, but the mechanical properties of the polyurethane foam dressing material after absorbing exudates are poor in changing the dressing material. If this is done, it may be torn or broken, so it is not easy to replace it, and a piece of torn or broken dressing material may remain filled in the wound.

U. S. Patent No. 4,664, 662 shows spherical hydrophilic foam dressings prepared by stacking several pieces of foam into a mesh of pocket form. However, since it has a predetermined size of spherical or cylindrical shape, it is inconvenient to apply to wounds having various shapes and sizes, and also has limitations in use due to the disadvantage that the user cannot divide or cut it into an appropriate size and shape. have.

Summarizing the problems of the conventional filling dressing material, it is inconvenient to remove and replace due to deterioration of mechanical properties due to the exudation absorption, and the shape and size of the standard. It has a difficult problem.

The present invention is invented to solve the conventional problems as described above, by bonding a net-type film to the surface of the hydrophilic foam to compensate for the mechanical property degradation of the hydrophilic foam due to swelling after absorption of exudates It is an object of the present invention to provide an efficient filling foam dressing material that can be applied to various wounds by cutting and splitting.

In order to achieve the above object, the present invention provides a filling foam dressing material in which a net film is bonded to one or both surfaces of a hydrophilic foam.

Specifically, the filling foam dressing material according to the present invention has a structure in which the film is bonded to the surface of the hydrophilic foam and the film is not bonded together, cutting and splitting are possible, and the size and shape can be controlled. free. The bonded film portion has a net shape continuously connected to isolate the non-bonded portion.

Therefore, in the foam dressing material according to the present invention, the exudates are absorbed into the hydrophilic foam through the non-bonded portion of the film, and at the same time, the film-bonded portion of the net form continuously connected to the physical properties of the hydrophilic foam due to the swelling after the absorption of the exudates. Reinforced degradation compensates for the tearing or breaking of the hydrophilic foam during dressing material change. And cutting and splitting are available so it can be applied freely according to the size and shape of the wound.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail. The accompanying drawings show an exemplary form of the present invention, which is provided only to help understanding of the present invention.

Referring to FIG. 1, the filling foam dressing material of the present invention is composed of a hydrophilic foam 10 and a net film 20 bonded to the surface of the hydrophilic foam 10. Specifically, the foam dressing material according to the present invention has a structure in which a net film 20 having a non-bonded portion 22 and a bonded portion 25 is bonded to the surface of the hydrophilic foam 10.

1 is an exemplary perspective view of a foam dressing material according to the present invention, in which the net-like film 20 is bonded to both sides of the hydrophilic foam 10, and FIG. 2 is a cross-sectional view of FIG. 1. 3 is a cross-sectional view illustrating the net-like film 20 bonded to one surface of the hydrophilic foam 10.

In the present invention, the net-like film 20 has a portion (bonded portion) capable of supporting the hydrophilic foam 10 while having a space (non-bonded portion) in which exudates can be absorbed into the hydrophilic foam 10. It is possible if it is bonded with. Specifically, the net-like film 20 has a network structure as a shape of a continuous straight line, curve, circle, oval, polygon, or a combination thereof. That is, the junction portion 25 has a net shape in which straight lines, curves, etc. are continuously connected to isolate the non-junction portion 22, and correspondingly, the non-junction portion 22 is a circle, an ellipse, or a polygon. It may have various shapes such as.

4, 5 and 6 is a plan view of the foam dressing material according to the present invention, illustrating various shapes of the net-like film 20. 4 illustrates a state in which the non-bonded portion 22 of the net-like film 20 is bonded to have a circular shape, and FIG. 5 corresponds to the bonded portion 25 of the net-like film 20 in a straight line. One non-joined portion 22 illustrates a rectangular shape. 6 illustrates a state in which the bonded portion 25 of the net-like film 20 is curved to correspond to the non-bonded portion 22 corresponding to various polygonal shapes. The net-like film 20 may be bonded to the surface of the hydrophilic foam 10 while having various shapes in addition to the shapes illustrated in the drawings.

In addition, the bonding area of the net film 20 is preferably in the range of 10 to 90% of the area of the hydrophilic foam (10). Specifically, it is preferable that the area of the bonded portion 25 occupies 10 to 90% of the total area (the area of the bonded portion 25 + the area of the non-bonded portion 22) of the net-like film 20. At this time, if the area of the bonding portion 25 exceeds 90%, it is difficult to absorb sufficient exudate, and if less than 10%, it is difficult to reinforce the physical properties of the hydrophilic foam 10 during swelling. The thickness t of the net-like film 20 is variously set according to the purpose and use of the foam dressing material and the characteristics and thickness of the hydrophilic foam 10.

The hydrophilic foam 10 is a hydrophilic sponge structure that absorbs and retains an exudate. The hydrophilic foam 10 may be freely deformed and elastic, and may be cut and divided. Here, the cutting and dividing means that the cutting device can be freely divided by the hand as well as the cutting device, and can be applied in various sizes and shapes regardless of the size and shape of the wound.

The hydrophilic foam 10 is composed of synthetic polymers such as polyurethane, polyethylene, silicone resin, natural and synthetic rubber, polyglycolic acid, polylactic acid or copolymers thereof, polyvinyl alcohol, polyvinylpyrrolidone, collagen, gelatin, and the like. And natural polymers such as Karayacomb, guar gum, hyaluronic acid, sodium alginate, chitin, chitosan, fibrin cellulose, or synthetic polymers derived from these may be used alone or in combination. Preferably, it is a hydrophilic polyurethane foam manufactured using polyurethane as a main material, which has excellent mechanical properties and can have high water absorption and high moisture permeability. More preferably, the polyurethane foam includes a large number of open cells having a diameter of 50 to 400 μm and pores having a diameter of 10 to 80 μm, and has a high absorption rate of 500 to 2,000 wt%, 35 ° C., and 90%. It has a high moisture permeability of 2,000 ~ 5,000g / ㎡ / 24hrs under the relative humidity of.

Polyurethane foam which can be preferably applied as the hydrophilic foam 10 in the present invention is to prepare a polyurethane prepolymer using an isocyanate compound and a polyol having two or more hydroxyl groups, the prepolymer foaming agent and crosslinking agent, and a surfactant, It is prepared by mixing and stirring an additive including a moisturizer, a pigment, and the like into a predetermined mold, or by cutting a polyurethane foam prepared using a large mold to an appropriate size and thickness.

The net film 20 does not interfere with the free deformation and splitability of the hydrophilic foam 10, and may be manufactured from various synthetic polymers and natural polymers.

Specifically, the net film 20 is a synthetic polymer, natural and synthetic rubber selected from polyvinyl chloride, polyethylene, polypropylene, polyvinyl alcohol, polyvinylpyrrolidone, polyester, polyurethane, etc. And films prepared using a single or mixed natural polymer selected from silicone, cellulose and the like. Preferably, it is preferable to use a polyurethane film having excellent mechanical properties such as tensile strength and stretching force.

Meanwhile, the method of bonding the film 20 to the surface of the hydrophilic foam 10 is not particularly limited, but the method of directly coating and drying the film 20 solution on the hydrophilic foam 10 and the film on the release paper ( 20) After coating and drying the manufacturing solution, it can be used a method of thermocompression transfer bonding on the hydrophilic foam (10).

The method of directly coating the film production solution on the hydrophilic foam 10 is a method of directly coating a low viscosity film-forming resin solution (eg, a polyurethane resin solution) dissolved in a solvent using a screen printing machine directly on the hydrophilic foam 10. After the hot air drying in the oven to volatilize the solvent to form a film can be made of a foam dressing material bonded to the various film (Net) type film 20 as shown in the accompanying drawings.

In addition, the thermocompression transfer bonding method using a film prepared by coating a release paper may be usefully used in the following two methods.

First, a low-viscosity resin solution (for example, a polyurethane resin solution) dissolved in a solvent is coated on various types of nets on a release paper using a screen printing machine or a film coater, followed by volatilization of the solvent by hot air drying in an oven. The film 20 is manufactured. Then, the release paper having the film 20 attached thereto is laminated on the hydrophilic foam 10, and then a constant temperature and pressure are applied using a hot press or the like for a predetermined time. It is possible to obtain a foam dressing material in which a film 25 in the form of a net is bonded onto the hydrophilic foam 10 while being transferred toward the surface of the hydrophilic foam 10.

Secondly, the film 20 is mechanically punched to produce various net-shaped films 20 by mechanical punching, and then hot presses are used as in the first method. It is a method of transferring the film 20 in the form of a net (Net) to the surface of the hydrophilic foam (10).

In the foam dressing material of the present invention as described above, the film non-bonded portion 22 provides a passage through which the exudates can be absorbed into the hydrophilic foam 10, and the joining portion 25 having a net shape in succession is a hydrophilic foam. Support the surface of (10) to reinforce the mechanical properties. That is, the hydrophilic foam 10 is degraded due to the swelling (Swelling) phenomenon due to the absorption of exudates, the bonding portion 25 is to strengthen the physical properties that the hydrophilic foam 10 is torn or broken when the dressing material exchange Complement. In addition, the foam dressing material according to the present invention can be cut and divided so that it can be freely cut to fit various wounds.

Hereinafter, specific test synthesis examples, examples and comparative examples according to the present invention will be described. However, these are provided only to explain the present invention in detail, and the technical scope of the present invention is not limited thereto.

Synthesis Example

242.8 g of toluene diisocyanate was added to a 3 liter round bottom flask equipped with a stirrer, and the temperature was raised to 60 ° C., followed by three hydroxyl groups, an ethylene oxide / propylene oxide random copolymer, and an ethylene oxide content of 75%. Korea Polyol Co., Ltd.) was added in small amounts of 1257.5g to react for 7 hours until the theoretical NCO% was reached to prepare a polyurethane prepolymer having isocyanate end groups. At this time, a sample was taken in the middle of the reaction to measure NCO%. NCO% was determined by titrimetry using n-butylamine standard solution.

EXAMPLE

51.4 wt% of the polyurethane prepolymer prepared in the above synthesis example, 26.7 wt% of distilled water as a blowing agent, 6.4 wt% of guar gum as a moisturizer, 14.1 wt% of glycerin as a crosslinking agent, 1.4 wt% of L-64 (Germany, BASF) as a surfactant. After stirring for 5 seconds at 4,000rpm was added to the injection molded foam of a predetermined shape to prepare a block foam (Block Foam). The block foam was sliced to prepare a hydrophilic polyurethane foam having a thickness of 2 mm.

In addition, a polyurethane elastomer was added to a mixed solvent of dimethylformamide (DMF) and methyl ethyl ketone (MEK) (DMF: MEK = 3: 7) to prepare a net-like film, and the mixture was heated and stirred at 60 ° C. to obtain a polyurethane solution. .

Next, the polyurethane solution was coated in a net form on a release paper using a screen printing machine (Dansan Tech Co., Ltd., product name DS-68M) and dried in an oven at 100 ° C. for 3 minutes. And it was laminated on both sides of the hydrophilic polyurethane foam and then using a thermocompression transfer method to complete the foam dressing material in which the net-like film is bonded to both sides. Specifically, by applying a 1.5kg / ㎠ pressure at 120 ℃ for 5 seconds with a hot press (Net) film of the non-bonded portion circular structure as shown in Figure 1 bonded to both sides of the polyurethane foam The double-sided bonding type dressing material was completed. At this time, a number of foam dressing materials were made, varying the thickness (t) and the bonding area of the polyurethane film. In Table 1, the thickness (t) of the polyurethane film is 20 μm, and the bonding area is 10% (Example 1), 30% (Example 2), 50% (Example 3), 70 of the total area. The thickness t of the foam dressing material of% (Example 4), 90% (Example 5), and the polyurethane film was 30 µm, the bonding area was 10% (Example 6), and the thickness of the polyurethane film was ( A foam dressing material having a t) of 40 µm and a bonding area of 10% (Example 7) was shown.

Tensile strength and elongation before and after swelling were measured for the hydrophilic polyurethane foam dressing material according to Examples 1 to 7 above, and the results are shown in the following [Table 1]. And the measuring method such as thickness and physical properties used in the present embodiment is as follows.

① Thickness measurement

The thickness of the hydrophilic polyurethane foam and the thickness t of the polyurethane film were measured using a dial micrometer.

② Bonded Polyurethane Film Area Ratio

Polyurethane film bonding area ratio was measured by using an image analyzer (Inwoo Hi-Tech Co., Ltd., product name RZR 2051) to measure the area of the bonded polyurethane film and the area ratio of the bonded polyurethane film to the total polyurethane foam area (% ) Was calculated.

③ Absorption test [absorbency (%) and retention (%)]

First, the absorbency was taken as the size of 3cm x 3cm dressing material with a net polyurethane film attached to both sides of the hydrophilic polyurethane foam to measure the initial weight (A) and impregnated in 25 ℃ distilled water for 24 hours After taking out, wipe off the moisture on the surface with a dust-free tissue and then measured the weight (B), using the following equation.

           Absorbance (%) = (B-A) / A × 100

 In addition, the retention degree was measured by placing the weight of 6kg weight on the sample (3cm ㅧ 3cm) finished 20 seconds after the absorbance measurement as described above to measure the weight of the sample (C), using the following equation.

           Retention (%) = (C-A) / A × 100

 ④ Mechanical Properties (tensile strength, elongation)

A tensile tester (Universial Test Machine, USA, Instron) was measured according to JIS-K-6401. After swelling, the test was performed by swelling the specimen in 37 ° C distilled water for 24 hours. Measured.

Comparative Example 1

In the above example, the polyurethane film was not bonded to the hydrophilic polyurethane foam. Physical properties were measured in the same manner as in Example, and the results are shown in the following [Table 1].

<Property evaluation results of hydrophilic polyurethane foam dressing material> division Polyurethane Foam Thickness (mm) Thickness of the attached polyurethane film (mm) Attachment area ratio of polyurethane film (%) Absorption test Tensile Strength (gf / mm2) Elongation (%) Absorbance (%) Retention degree (%) Swelling After swelling Swelling After swelling Example 1 2 20 10 990 450 9.10 1.42 202 140 Example 2 2 20 30 950 435 16.2 3.48 230 144 Example 3 2 20 50 910 440 19.58 5.94 242 164 Example 4 2 20 70 885 420 24.39 9.12 307 192 Example 5 2 20 90 850 425 31.24 12.34 411 241 Example 6 2 30 50 875 440 21.92 6.98 294 198 Example 7 2 40 50 850 435 32.03 13.24 443 263 Comparative Example 1 2 - 0 1,000 400 8.42 1.34 189 132

As can be seen from the above [Table 1], when the thickness (t) of the bonded polyurethane film is the same, it can be seen that the higher the polyurethane film bonding area, the tensile strength and the elongation rate gradually improve. In addition, absorbance (%) gradually decreases slightly, and retention (%) does not show a big difference. And looking at Example 3, Example 6, Example 7, it can be seen that when the area of the bonded polyurethane film is the same, when the thickness of the bonding film is increased, the tensile strength and the elongation increase as in the case where the bonding area is high. Therefore, it can be seen that physical properties can be adjusted by varying the bonding area and thickness (t) of the polyurethane film according to the properties, size, and use of the polyurethane foam. In addition, Examples 1 to 7 according to the present invention can be seen that the tensile strength and elongation rate is significantly superior to Comparative Example 1 without a significant decrease in absorbance.

As described above, the present invention enables absorption of the exudates into the non-bonded portion 22 by bonding the net-like film 20 to the surface of the hydrophilic foam 10, and the continuous bonded portion 25 is swelled ( By reinforcing the mechanical properties of the sharply falling hydrophilic foam 10 after the swelling) has the effect of complementing the tearing or breaking of the foam 10 when the dressing material is replaced.

In addition, it is possible to use cutting and splitting to an appropriate size to provide an improved form of dressing material that can be variously cut and used according to the size and shape of the wound is excellent in physical properties and free filling than conventional products.

Claims (5)

Filling foam dressing material, The structure is made by bonding the net-like film 20 of the network structure to one or both surfaces of the hydrophilic foam 10, The hydrophilic foam 10 is produced by slicing the surface of the obtained foam after the injection of the natural polymer or synthetic polymer into the mold to obtain a foam, an open cell (diameter) of 50 ~ 400㎛ diameter and diameter 10 Filled foam dressing material, characterized in that the sponge structure containing a pore (~ 80㎛). The method of claim 1, The net-type film 20 of the network structure is a synthetic polymer selected from polyvinyl chloride, polyethylene, polypropylene, polyvinyl alcohol, polyvinylpyrrolidone, polyester, polyurethane, natural and synthetic rubber, silicone, Filled foam dressing material, characterized in that the film produced by using a single or mixed natural polymer selected from cellulose. The method of claim 1, Filled foam dressing material, characterized in that the shape of the net-like film (Net) film 20 is a continuous straight line, curve, circle, oval, polygon or a combination thereof. The method of claim 1, Filled foam dressing material, characterized in that the hydrophilic foam (10) is a hydrophilic polyurethane foam. The method according to any one of claims 1 to 4, Filled foam dressing material, characterized in that the bonding area of the net (Net) film 20 of the network structure is 10 to 90% of the area of the hydrophilic foam (10).

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