JP6067974B2 - Secondary dressing with wound dressing - Google Patents

Description

  The present invention relates to a wound covering material used for covering and treating a wound.

Japanese Patent Application Laid-Open No. 2011-115611 (Patent Document 1) discloses a wound covering material for absorbing and retaining exudate. This wound part covering material has hydrophobicity, the air permeability of JISL1096 is 20 to 2000 cm ³ / cm ² · s, and the water repellency of JISL1092 is 3 points or more, so that the function of initial water pressure resistance is achieved. And includes a first layer including a porous sheet facing the wound surface and a second layer that functions to absorb exudate that has exuded from the wound site and permeated through the first layer. .

  In order to treat a wound part effectively using a wound part covering material, first, the exudate from the wound part was appropriately held in the wound part covering material, and thereby covered with the wound part covering material. There is a need to keep the wound area properly moist. Moreover, it is necessary to avoid that the wound part is unnecessarily pressed by the exudate being appropriately discharged from the wound part. Furthermore, it is required that the wound part covering material adheres to the wound part or is rubbed against the wound part so that the wound part covering material itself does not cause deterioration of the wound.

  In particular, when the wound part covering material and the wound part move relatively so that the wound part covering material slides so as to rub the wound part, there is a possibility that the sliding action may adversely affect the wound. Therefore, it is important to avoid the sliding motion.

  On the other hand, in order to avoid the sliding movement of the wound part covering material with respect to the wound part, when configured so that the wound part covering material does not closely adhere to the wound part, problems caused by the sliding action can be alleviated, The wound dressing material needs to cover the wound portion and provide a predetermined wet state. However, it is difficult to produce such a wet state, and thus there is a problem in terms of wound treatment effect.

JP 2011-115611 A

  In view of the above, an object of the present invention is to provide a wound covering technique that contributes to improving the covering effect of a wound.

The above problems are solved by the invention described in the claims. Hereinafter, the present invention will be described based on embodiments for carrying out the present invention. According to the present invention, a secondary dressing material is provided that includes a wound covering material having a liquid-permeable first layer and a liquid-absorbing second layer superimposed on the first layer.

  “Liquid permeability” in the first layer includes both an aspect in which the first layer permeates all of the liquid (typically exudate from the wound portion) and an aspect in which it partially permeates. “Liquid absorbency” in the second layer refers to a state in which the second layer absorbs and holds the liquid (typically exudate from the wound), and absorbs and holds all of the liquid. Embodiments include both embodiments and partially absorbing and retaining embodiments.

  The “wound” in the present invention includes various cases such as burns, pressure sores, contusions, abrasions, or ulcers. The first layer and the second layer include both a mode in which they are directly stacked and a mode in which they are stacked in a state in which an intervening layer is provided between them. In the case of providing an intervening layer, the intervening layer is constituted by a liquid-absorbing layer, so that the second layer and the liquid-absorbing / holding can cooperate with each other. Or it is good also as an aspect which accept | permits that the liquid which permeate | transmitted the 1st layer is sent to a 2nd layer by comprising the said intervening layer by a liquid-permeable layer. Moreover, both the aspect which comprises an intervening layer by a single layer, and the aspect comprised by multiple layers are included.

The first layer of the wound covering material is constituted by a porous sheet in which a plurality of holes are formed.
And the porous sheet which comprises a 1st layer has the wound part coating | coated surface which coat | covers a wound part, and the 2nd layer opposing surface which faces the said 2nd layer in the opposite side to the said wound part coating | coated surface. The plurality of holes need only be formed in the first layer so as to correspond to at least the wound portion covering region, but may be formed over the entire surface of the first layer.

On the other hand, the second layer of the wound covering material is formed on the first layer facing surface facing the first layer and on the side opposite to the first layer facing surface, and the wound covering material is connected to the wound portion. And a secondary dressing material facing surface capable of abutting against the secondary dressing material received between them. Diapers are used as the secondary dressing material.

  In the present invention, each of the plurality of holes in the porous sheet is configured to have a first opening formed in the wound covering surface and a second opening formed in the second layer facing surface. . In other words, for each of the plurality of holes, the opening facing the wound covering surface corresponds to the first opening, and the opening facing the second layer facing surface corresponds to the second opening. And the opening ratio of the 1st opening part which occupies for a wound part covering surface is set larger than the opening ratio of the 2nd opening part which occupies for the 2nd layer opposing surface. The opening ratio in each surface is defined by the area ratio of the opening to the entire surface. That is, the opening ratio of the first opening is larger than the opening ratio of the second opening. The ratio of the total area of the first opening of each hole to the area (effective area) of the wound covering surface is the second layer. It means that it is set to be larger than the ratio of the total area of the second openings of each hole to the area (effective area) of the facing surface.

  By comprising in this way, about the liquid (typically exudate) from a wound part, while making it easy to take in a wound part covering material through a 1st opening part, the liquid once taken in absorbs or hold | maintains this. It is possible to prevent leakage from the second layer through the second opening facing the second layer and the first layer to the outside, in particular, the wound portion as much as possible. Thereby, the appropriate wet state in the wound part covered can be maintained. Moreover, in this invention, the ratio which a wound part coating surface directly contacts a wound part can be made relatively small by setting the opening ratio by the 1st opening part in a wound part coating surface relatively large. As a result, the wound covering surface sticks to and adheres to the wound part, effectively suppressing the situation of worsening the symptoms of the wound part, and dealing with a wide range of symptoms from mild to severe It becomes possible.

  In this invention, the opening ratio of the 1st opening part which occupies for the wound part covering surface is set to about 75 to 95 percent, preferably about 80 to 95 percent. By setting the opening ratio of the first opening relatively large, the absorbability of exudate on the wound portion covering surface of the first layer is improved, the air permeability is improved, and the wound portion covering surface is a patient wound. The area in contact with the part can be reduced as much as possible, and both wettability of the wound part and reduction of the contact area with the wound part can be satisfied at the same time.

  In this invention, the static friction coefficient with respect to the secondary dressing material of a secondary dressing material opposing surface is set smaller than the static friction coefficient with respect to the wound part of a wound part coating surface.

By comprising in this way, even if it is a case where a wound part covering material receives the force which rubs against a wound part by input of external force, etc., the secondary dressing material opposing surface and secondary where a coefficient of static friction was set small A relative movement operation will occur between the dressing material and, on the contrary, unnecessary fluctuations in the contact state between the wound covering material and the wound portion can be avoided. For this reason, the wound part covering material can be prevented from sliding and rubbing against the wound part, which contributes to effective protection of the wound part. That is, when an external force is applied to the wound part covering material, the relative movement occurs between the second layer and the secondary dressing material while maintaining the contact state between the first layer and the wound part. A secondary dressing characterized in that is constructed. In addition, the present invention maintains the wound covering state by causing a relative movement between the wound covering material and the secondary dressing material when an external force is applied to the wound covering material, and thus the wound portion. It is particularly suitable for use as a pressure ulcer sheet because it relates to a technique for suppressing adverse effects on the wound due to rubbing of the covering material.

  Moreover, as 1 aspect of this invention, while the 1st layer in the said wound dressing is interposed between a 2nd layer and a wound part, while avoiding that a 2nd layer hits the said wound part directly, a wound When an external force is applied to the part covering material, it is configured such that relative movement occurs between the second layer and the secondary dressing material while maintaining the contact state between the first layer and the wound part. Is preferred. Thereby, the sliding operation between the wound part covering surface and the wound part is suppressed, and even when an external force is applied to the wound part covering material, it is possible to suppress the wound part from being adversely affected by rubbing. .

  In one embodiment of the present invention, the first layer and the second layer are preferably joined to each other by welding or an adhesive. For the welding, the first layer and the second layer are formed by hot-melt fibers or partially mixed with hot-melt fibers, and the hot-melt fibers are heat-welded to form the first layer and the second layer. An embodiment in which the layers are welded is preferred.

  Moreover, as 1 aspect of this invention, the 1st opening part which has a predetermined | prescribed opening ratio with respect to a wound part covering surface can maintain the liquid absorption amount of the exudate from the wound part in a 2nd layer at a predetermined amount. preferable. On the other hand, it is preferable that the second opening portion having a predetermined opening ratio with respect to the second layer facing surface maintains a predetermined amount of leakage of exudate held in the second layer to the wound portion side. By configuring in this way, it becomes possible to rationally control the total amount of exudate in the wound covered with the wound covering material, and it is possible to optimize and maintain the wet state of the wound become.

  As one aspect of the present invention, each of the plurality of holes is preferably formed such that the effective cross-sectional area decreases sequentially from the first opening toward the second opening. Thereby, the liquid absorption promotion from a wound part and suppression of the liquid leakage from a 2nd layer are implement | achieved rationally.

  In particular, each of the plurality of holes is preferably formed in a substantially conical shape having the first opening and the second opening as the bottom surface and the top surface, respectively.

  “Forming in a conical shape” means that each of a plurality of holes forms an inverted cone shape (conical shape) when the wound covering material is observed from the side surface. Promotion of liquid absorption and suppression of liquid leakage from the second layer can be realized more reliably.

  As one aspect of the present invention, the first layer has a ratio of leaking to the wound covering surface side, assuming that the exudate absorbed by the second layer is, for example, a case where beef is used in the wound part. It is preferable to set it to be within 5 percent. Thereby, it can suppress that a wound part wets excessively.

  In one embodiment of the present invention, 5 milliliters of a 0.9 percent sodium chloride solution is supplied to the second layer through the wound covering surface of the first layer and a load of 5 grams per square centimeter is applied to the wound covering surface. The amount of leakage when acting for a minute is preferably suppressed within a range of approximately 0 to 0.1 grams. Thereby, it can suppress that a wound part wets excessively.

  Moreover, as one aspect of the present invention, it is preferable that the opening ratio of the second opening occupying the second layer facing surface is set to approximately 3 to 50 percent. By setting the opening ratio of the second opening relatively small, the liquid absorbed and retained in the second layer is effectively prevented from leaking back to the wound through the second opening of the first layer. Is done.

  In particular, the opening ratio of the second opening occupying the second layer facing surface is preferably set to approximately 3 to 20 percent. This makes it possible to ultimately reduce the amount of leakage of the liquid absorbed and held in the second layer to the wound part.

  Moreover, as one aspect of the present invention, the apparent thickness of the first layer is set to about 0.1 to 1.2 millimeters from the viewpoints of healing performance, wet state maintenance, and liquid returnability. More preferably, it is more preferably set to about 0.3 to 1.2 millimeters.

  As one aspect of the present invention, the ventilation resistance value from the wound layer covering surface of the first layer to the side surface opposite to the first layer in the second layer is set to be 0.1 Ks · s / m or less. It is preferable. By keeping the ventilation resistance value relatively low, it is possible to effectively prevent the wounded part from becoming too steamy and adversely affecting healing.

  ADVANTAGE OF THE INVENTION According to this invention, the wound part coating technique which contributes to improving the effectiveness of the covering of a wound part was provided.

It is a typical perspective view which shows the outline | summary of the wound part coating sheet 101 which concerns on Example 1 of this invention. 3 is a schematic cross-sectional view showing a detailed configuration of a wound part covering sheet 101 according to Example 1. FIG. 3 is a schematic cross-sectional view showing a detailed configuration of a wound part covering sheet 101 according to Example 1. FIG. It is typical sectional drawing which shows one embodiment of the performance evaluation of the wound part coating sheet 101 which concerns on Example 1. FIG. It is typical sectional drawing which shows one embodiment of the performance evaluation of the wound part coating sheet 101 which concerns on Example 1. FIG. It is a figure which shows the performance evaluation result of the wound part coating sheet 101 which concerns on Example 1. FIG. It is a figure which shows the performance evaluation result of the wound part coating sheet 101 which concerns on Example 1. FIG. It is a figure which shows the performance evaluation result of the wound part coating sheet 101 which concerns on Example 1. FIG. It is a figure which shows the performance evaluation result of the wound part coating sheet 101 which concerns on Example 1. FIG. It is a figure which shows the performance evaluation result of the wound part coating sheet 101 which concerns on Example 1. FIG.

Example 1
Hereinafter, the best mode for carrying out the present invention will be described in more detail with reference to various examples. The structure of the wound part coating sheet 101 which concerns on Example 1 of this invention is typically shown by FIGS. 1-3. The wound portion covering sheet 101 is formed integrally with a first layer 110 formed in a sheet shape and a second layer 120 similarly formed in a sheet shape by spray hot-melt surface bonding to each other. . Both may be joined by heat welding. The said wound part coating | coated sheet | seat 101 is one implementation structural example corresponding to the "wound part coating | covering material" in this invention. Further, the first layer 110 and the second layer 120 are one implementation configuration example corresponding to the “first layer” and the “second layer” in the present invention.

(First layer)
The first layer 110 is a liquid-permeable porous sheet 110a that is in contact with the wound part 2 or the skin surface 1 shown in FIG. In other words, it has a predetermined air permeability and water repellency, and is suitably constituted by, for example, a perforet film. This liquid-permeable porous sheet 110a is one embodiment configuration example corresponding to the “porous sheet” in the present invention. As the material for forming the first layer, in addition to the film, for example, a nonwoven fabric made of a thermoplastic polymer can be used.

  The first layer 110 is attached to the skin surface 1 so as to face the wound portion 2 shown in FIG. 3 and the wound portion covering surface 111 for covering the wound portion 2 and the second layer 120 facing the second layer 120. A two-layer facing surface 112 is provided. The wound portion covering surface 111 and the second layer facing surface 112 are one implementation configuration example corresponding to the “wound portion covering surface” and the “second layer facing surface” of the present invention, respectively. In addition, the porous sheet 110a forming the first layer 110 has a plurality of holes 113 penetrating between the wound portion covering surface 111 and the second layer facing surface 112. This hole 113 is one implementation configuration example corresponding to the “hole” of the present invention.

  Each of the plurality of holes 113 has a first opening 114 that opens to the wound covering surface 111 and a second opening 115 that opens to the second layer facing surface 112. The 1st opening part 114 and the 2nd opening part 115 are one implementation structural example corresponding to the "1st opening part" and the "2nd opening part" of this invention, respectively.

  The ratio of the total area of the first openings 114 formed in large numbers on the wound covering surface 111 to the total area of the wound covering surface 111, that is, the opening ratio of the first opening 114, is the second layer facing surface 112. It is set so that the total area of the second openings 115 formed in large numbers on the upper surface is larger than the ratio of the total area of the second layer facing surface 112, that is, the opening ratio of the second openings 115. The specific values of the opening ratios of both will be described in detail in the following performance evaluation items.

(Second layer)
The second layer 120 shown in FIGS. 1 to 3 is preferably composed of a liquid-absorbing air-laid nonwoven fabric or an air-through nonwoven fabric. The 2nd layer 120 has the 1st layer opposing surface 121 which goes to the 1st layer 110, and the secondary dressing opposing surface 122 which goes to the diaper 130 shown in FIG. The second layer 120, the first layer facing surface 121, and the secondary dressing material facing surface 122 are each one of the “second layer”, “first layer facing surface”, and “secondary dressing material facing surface” in the present invention. It is an implementation structural example.

(Join the first layer and the second layer)
In Example 1, thermal welding by heat sealing is used for joining the first layer and the second layer. In addition to this, adhesion using a hot melt adhesive or the like, polymerization by embossing, etc. Is possible.

(Diapers)
As shown in FIG. 3, the wound portion covering sheet 101 according to the first embodiment is applied to the wound portion 2 on the skin surface 1 of the patient after being placed on the diaper 130. With respect to the material and basic configuration of the diaper 130, those equivalent to the conventional products can be suitably used. A wound part covering sheet placement surface 131 is formed on the diaper 130, and the wound part covering sheet 101 is placed on and integrated with the wound part covering sheet placement surface 131 (FIG. 3). For convenience of explanation, the two are shown apart from each other). The diaper 130 and the wound part covering sheet placement surface 131 are one implementation configuration example corresponding to the “secondary dressing material” and the “wound part covering material placement surface” in the present invention, respectively.

  Moreover, in the present Example 1, it is set as the structure by which the static friction coefficient with respect to the wound part of the wound part coating surface 111 is reduced by setting the opening ratio of the 1st opening part 114 in the wound part coating surface 111 large. Furthermore, the static friction coefficient with respect to the diaper 130 of the secondary dressing material facing surface 122 is set to be a relatively smaller value than the static friction coefficient with respect to the wound portion of the wound covering surface 111.

  The wound part covering sheet 101 according to the first embodiment is configured as described above. In particular, in the wound part covering sheet 101, the opening ratio of the first opening 114 occupying the total area of the wound part covering surface 111 is greater than the opening ratio of the second opening 115 occupying the total area of the second layer facing surface 112. Is also set larger. Thereby, the liquid (typically exudate) from the wound part 2 is easily taken into the wound part covering sheet 101 through the first opening 114, and the liquid once taken in absorbs or holds the liquid. It is possible to suppress leakage back to the wound part 2 side through the second opening 115 and the first opening 114 from the two layers 120. Thereby, the appropriate wet state in the wound part 2 covered with the wound part covering sheet 101 can be maintained. Moreover, the ratio in which the wound part covering surface 111 directly contacts the wound part 2 can be relatively reduced by setting the opening ratio of the first opening 114 in the wound covering surface 111 to be relatively large. Therefore, the situation where the wound part covering surface 111 sticks to and adheres to the wound part 2 and worsens the symptoms of the wound part 2 can be effectively suppressed.

  Further, even when an external force is applied to the wound portion covering sheet 101, due to the fact that the absolute value of the static friction coefficient of the wound portion covering surface 111 is reduced, the friction due to the friction of the wound portion covering surface 111 against the wound portion. In addition to reducing the adverse effects, the static friction coefficient on the secondary dressing material facing surface 122 side is set to be relatively smaller than the static friction coefficient on the wound covering surface 111 side, and therefore, to the wound portion on the wound covering surface 111 The secondary dressing material facing surface 122 having a relatively small static friction coefficient slides and slides with respect to the diaper 130 while maintaining the fixed / covered state of the wound, and the wound portion covering surface 111 rubs the wound portion. An adverse effect on a medical condition can be suppressed.

  The performance evaluation regarding the wound part covering sheet 101 described above was performed. Specifically, for various samples, (A) confirmation evaluation of the healing state, (B) confirmation evaluation of the wet state in the wound part, (C) confirmation evaluation of liquid return to the wound part, and (D) ventilation It is a confirmation evaluation of sex.

(Performance evaluation 1)
First, performance evaluation 1 will be described. As a sample, perforet film is used for the first layer, the basis weight is 24 g / m ² (gram / square meter), and the thickness is 0.3 mm (millimeter). A wound part covering sheet 101 having a thickness of 30 g / m ² and a thickness of 0.7 mm is prepared, and in the first layer 110, the opening ratio of the second opening 115 occupying the second layer facing surface 112 is fixed to 15%. In each of the samples 1 to 6 of the wound covering sheet 101, the opening ratio of the first opening 114 occupying the wound covering surface 111 is set to 39%, 47%, 58%, 80%, 90% and 95%. Prepared.

  Among the above performance evaluation items, (A) For confirmation evaluation of the healing state, each sample of the wound portion covering sheet 101 according to Example 1 is affixed to a patient having a wound on the sacrum, respectively, The wound healing state with the diaper worn is evaluated by a treatment specialist who mainly focuses on visual observation. When the wound healing effect was obtained as a result, the evaluation was “◯”, and when the wound healing effect was remarkably obtained, the evaluation was “◎”.

  Moreover, (B) About the confirmation evaluation of the wet state in a wound part, the apparatus which measures a moisture content using a bioelectric current impedance method (BIA method) (in this evaluation, the oral cavity which concerns on Life (life company) manufacture sale) (Moisture meter Mocus). Specifically, in a constant temperature and humidity condition maintained at a temperature of 20 ° C. and a humidity of 60%, the initial moisture content is measured using beef that looks like a pressure ulcer. By measuring, the change with time of the wet state was confirmed, and thereby the wet state was confirmed and evaluated.

Moreover, (C) About confirmation evaluation of the liquid return property to a wound part, as shown in FIG. 4, 5 milliliters of 0.9% sodium chloride solution is dripped at the wound part coating sheet 101. As shown in FIG. And as shown in FIG. 5, the filter paper F is installed on the wound part coating surface 111 of the 1st layer 110 of the said covering sheet 101, and the load W of 5 g / cm < ² > (5 gram / square centimeter) from the said filter paper F is shown. Is allowed to act on the covering sheet 101 for 3 minutes. Then, by measuring the return amount (gram) of the liquid absorbed by the filter paper F, it was evaluated how much liquid amount was returned from the wound part covering sheet 101 to the wound part side.

For (D) air permeability confirmation evaluation, the intake air and the exhaust air are circulated for 3 seconds at an air flow rate of 4 cc / cm ² · sec (4 cubic centimeters / square centimeter · second) with respect to the wound covering sheet. The ventilation resistance value (kPa · s / m) (kilopascal · second / meter) at that time was measured. For the measurement, an air permeability tester (KESF-8 manufactured by KATO TECK CO. LTD) was used.

FIG. 6 shows the performance evaluation 1, that is, the evaluation result when the aperture ratio of the first opening 114 is changed. For each sample 1-6 with different opening ratios of the first opening 114, as the above performance evaluation, (A) confirmation evaluation of the healing state, (B) confirmation evaluation of the wet state in the wound part, (C) to the wound part Each result of confirmation evaluation of liquid return property and (D) confirmation evaluation of air permeability is shown.
In view of the above confirmation evaluation items, the opening ratio of the first opening 114 in the wound portion covering surface 111 is preferably set to approximately 50 to 95%, and more preferably approximately 75 to 95%. It was recognized that a particularly excellent effect was obtained when the ratio was preferably set to approximately 80 to 95 percent.

(Performance evaluation 2)
Next, performance evaluation 2 will be described. As a sample, a wound covering sheet having a basic configuration equivalent to the performance evaluation is prepared, and in the first layer 110, the opening ratio of the first opening 114 occupying the wound covering surface 111 is fixed to 80%. Each sample 1 to 5 of the wound covering sheet 101 in which the opening ratio of the second opening 115 occupying the second layer facing surface 112 is set to 3%, 5%, 15%, 50%, and 60% is prepared. For each sample, as in the performance evaluation 1, (A) confirmation evaluation of the healing state, (B) confirmation evaluation of the wet state in the wound part, (C) confirmation evaluation of liquid return to the wound part, and (D) The air permeability was confirmed and evaluated. The result is shown in FIG.

  In view of each confirmation evaluation item shown in FIG. 7, the opening ratio of the second opening 115 to the second layer facing surface 112 is preferably set to approximately 3 to 20%, preferably approximately 3 to 50%. In addition, when it was further set to about 3 to 15%, it was recognized that an excellent effect was obtained particularly from the viewpoint of the liquid return inhibiting ability.

(Performance evaluation 3)
Next, performance evaluation 3 will be described. As a sample, in the wound covering sheet 101 equivalent to the performance evaluations 1 and 2 described above, the perforation film is used for the first layer, the basis weight is 24 g / m ² (gram / square meter), and the opening ratio of the first opening is 80%, the opening ratio of the second opening is fixed to 15%, and the second layer is fixed to 30 g / m ² and the thickness is 0.7 mm with an air-through nonwoven fabric, and the thickness of the first layer 110 is further fixed. Samples 1 to 5 set to 0.07 mm (millimeters), 0.1 mm, 0.3 mm, 0.8 mm, and 1.2 mm are prepared. Similarly, (A) confirmation evaluation of healing state, (B) confirmation evaluation of wet state in wound part, (C) confirmation evaluation of liquid return to wound part, and (D) confirmation of breathability. Evaluation was performed. The result is shown in FIG.

  In view of each confirmation evaluation item shown in FIG. 8, the thickness of the first layer 110 is preferably set to about 0.1 to 1.2 mm, and further set to about 0.3 to 1.2. In particular, it was confirmed that excellent effects were obtained from the viewpoints of healing performance, wet state maintenance, and liquid return.

(Performance evaluation 4)
Next, performance evaluation 4 will be described. As a sample, in the wound covering sheet 101 equivalent to the performance evaluations 1, 2, and 3 above, using beef that looks like a pressure ulcer, a perforation film is used for the first layer and the basis weight is 24 g / m ² (gram / Square meter), the opening ratio of the first opening is fixed to 80%, the opening ratio of the second opening is fixed to 15%, and the thickness is fixed to 0.3 mm (millimeter). 30 g / m ^2, and the final absorption amount of the liquid is different from 3.0 g (grams), 1.8 g, and 0 g. For each sample, (A) confirmation evaluation of healing state, (B) wet state in wound part Confirmation evaluation, (C) confirmation evaluation of liquid return property to the wound part, and (D) confirmation evaluation of air permeability. The result is shown in FIG.

  In view of each confirmation evaluation item shown in FIG. 9, it is recognized that the liquid absorption performance of the wound covering sheet 101 according to the present embodiment having the above specifications is preferably set to about 1.8 g (grams).

(Performance evaluation 5)
Next, performance evaluation 5 will be described. Sample 1 of wound covering sheet 101 (80% opening ratio of first opening 114 (Opn1), 15% opening ratio of second opening (Opn2)) having the same configuration as performance evaluation 4 is prepared as a sample. Further, as comparative examples, the first and second opening ratios are both 47.1 percent in Comparative Example 1 (Compare 1) and 57.5 percent in both Comparative Examples 2 (Compare 2). 39.4 percent of Comparative Example 3 (Compare 3), both using 0.5 percent of Comparative Example 4 (Compare 4), the static friction coefficient of the wound covering surface 111 of the first layer 110 with respect to the wound portion, and the second layer The static friction coefficient (refer also to FIG. 3) with respect to the diaper 130 of the secondary dressing material facing surface 122 according to 120 is measured. And value. In measuring the coefficient of static friction, artificial leather is used as a wound part, and a spunbond (20 g / m ² basis weight) is used on the surface side of the diaper 130, that is, the side on which the wound part covering sheet 101 abuts. Each of the diaper 130 in a dry state (Dry) and a wet state (Wet) was measured. For the measurement, a portable tribometer muse manufactured by SHINTO Scientific Co. Ltd. was used. The result is shown in FIG.

  In FIG. 10, reference numeral I is a coefficient of static friction in the dry state of the wound covering surface 111 with respect to the wound part, reference numeral II is a coefficient of static friction in the wet state of the wound covering surface 111 with respect to the wound part, and reference numeral III is the secondary dressing The coefficient of static friction in the dry state of the material facing surface 122 with respect to the diaper 130, and the symbol IV indicate the coefficient of static friction in the wet state of the facing surface 122 with respect to the diaper 130, respectively.

  As shown in FIG. 10, the sample 1 in which the opening ratio of the first opening 114 occupying the wound covering surface 111 is set to a relatively large value of 80% is in a dry state and wet compared to the other comparative examples. In any of the states, the static friction coefficient of the wound covering surface 111 with respect to the wound portion is reduced, and the static friction coefficient of the secondary dressing material facing surface 122 with respect to the diaper 130 shows a relatively small value. Therefore, even when an external force is applied to the wound portion covering sheet 101, friction of the wound portion covering surface 111 against the wound portion is caused by the fact that the absolute value of the static friction coefficient of the wound portion covering surface 111 is reduced. The wound portion of the wound covering surface 111 is reduced because the static friction coefficient on the secondary dressing material facing surface 122 side is set to be relatively smaller than the static friction coefficient on the wound covering surface 111 side. The secondary dressing material facing surface 122 having a relatively small static friction coefficient slides and slides with respect to the diaper 130 while maintaining the fixed / covered state on the wound portion, and the wound portion covering surface 111 rubs the wound portion. Adversely affecting the medical condition.

Based on the characteristics of the present invention described above, the following aspects are constructed.
(Aspect 1)
A wound covering material having a liquid-permeable first layer and a liquid-absorbing second layer superimposed on the first layer,
The first layer is composed of a porous sheet in which a plurality of holes are formed,
The porous sheet has a wound portion covering surface that covers the wound portion, and a second layer facing surface that faces the second layer on the opposite side of the wound portion covering surface,
The second layer is formed on the first layer facing surface facing the first layer and on the opposite side of the first layer facing surface, and receives the wound covering material between the wound portion and the secondary layer. A secondary dressing material facing surface capable of contacting the dressing material;
The wound dressing material, wherein a static friction coefficient of the second dressing material facing surface with respect to the secondary dressing material is set to be smaller than a static friction coefficient with respect to the wound portion of the wound dressing surface.

(Aspect 2)
Each of the plurality of holes in the porous sheet has a first opening formed in the wound covering surface and a second opening formed in the second layer facing surface,
The wound covering material, wherein an opening ratio of the first opening occupying the wound covering surface is set larger than an opening ratio of the second opening occupying the second layer facing surface.

(Aspect 3)
3. The wound part covering material according to aspect 1 or 2, wherein the first layer is interposed between the second layer and the wound part to prevent the second layer from directly contacting the wound part. In addition, when an external force is applied to the wound covering material, relative movement occurs between the second layer and the secondary dressing material while maintaining the contact state between the first layer and the wound portion. It is comprised so that the wound part coating | covering material characterized by the above-mentioned.

(Aspect 4)
The wound dressing material according to any one of aspects 1 to 3,
The first opening having a predetermined opening ratio with respect to the wound covering surface maintains a predetermined amount of exudate from the wound in the second layer, and the second layer facing surface The second opening portion having a predetermined opening ratio maintains a predetermined amount of the exudate held in the second layer to the wound portion side, and the exudate from the first opening portion. The wound covering material is characterized in that the liquid absorption amount is set so as to exceed the leakage amount of exudate from the second opening.

(Aspect 5)
The wound dressing material according to any one of aspects 1 to 4,
Each of the plurality of holes is formed so that the effective step area decreases sequentially from the first opening toward the second opening.

(Aspect 6)
The wound dressing material according to any one of aspects 1 to 5,
Each of the plurality of holes is formed in a substantially conical shape having the first opening and the second opening as a bottom surface and a top surface, respectively.

(Aspect 7)
The wound dressing material according to any one of aspects 1 to 6,
The wound covering material according to claim 1, wherein the first layer is set so that the exudate absorbed by the second layer leaks to the wound covering surface side within approximately 5%.

(Aspect 8)
The wound dressing material according to aspect 7,
When 5 ml of 0.9% sodium chloride solution is supplied to the second layer through the wound covering surface of the first layer, and a load of 5 grams per square centimeter is applied to the wound covering surface for 3 minutes. A wound covering material characterized in that a leakage amount is suppressed within a range of about 0 to 0.1 g.

(Aspect 9)
The wound dressing material according to any one of aspects 1 to 8,
The wound covering material, wherein an opening ratio of the first opening occupying the wound covering surface is set to approximately 50 to 90%.

(Aspect 10)
The wound dressing material according to any one of aspects 1 to 8,
The wound covering material, wherein an opening ratio of the first opening occupying the wound covering surface is set to approximately 75 to 95 percent.

(Aspect 11)
The wound dressing material according to any one of aspects 1 to 10,
The wound covering material, wherein an opening ratio of the second opening occupying the second layer facing surface is set to approximately 3 to 50%.

(Aspect 12)
The wound dressing material according to any one of aspects 1 to 10,
The wound covering material, wherein an opening ratio of the second opening occupying the second layer facing surface is set to approximately 3 to 20%.

(Aspect 13)
The wound dressing material according to any one of aspects 1 to 12,
An apparent thickness of the first layer is set to about 0.1 to 1.2 mm.

(Aspect 14)
The wound dressing material according to any one of aspects 1 to 13,
The airflow resistance value from the wound part covering surface of the first layer to the side surface opposite to the first layer in the second layer is set to be 0.1 Ks · s / m or less. Wound covering material.

(Aspect 15)
The wound dressing material according to any one of aspects 1 to 14,
The wound dressing material, wherein the secondary dressing material is a diaper.

DESCRIPTION OF SYMBOLS 1 ... Skin surface 2 ... Wound part 101 ... Wound part coating sheet (wound part coating | covering material)
110 ... first layer 110a ... porous sheet
111 ... Wound covering surface 112 ... Second layer facing surface 113 ... Hole 114 ... First opening 115 ... Second opening 120 ... Second layer 121 ... First layer facing surface 122 ... Secondary dressing material facing surface 130 ... Diapers (secondary dressing material)
131 ... Wound covering material placement surface

Claims (2)

A secondary dressing comprising a wound dressing,
The wound covering material has a liquid-permeable first layer and a liquid-absorbing second layer superimposed on the first layer ,
The first layer is composed of a porous sheet in which a plurality of holes are formed,
The porous sheet has a wound portion covering surface that covers the wound portion, and a second layer facing surface that faces the second layer on the opposite side of the wound portion covering surface,
The second layer is formed on the first layer facing surface facing the first layer and on the opposite side of the first layer facing surface, and receives the wound portion covering material between the wound portion and the second layer. A secondary dressing material facing surface capable of contacting the next dressing material,
Each of the plurality of holes in the porous sheet has a first opening formed in the wound covering surface and a second opening formed in the second layer facing surface,
The opening ratio of the first opening occupying the wound covering surface is set larger than the opening ratio of the second opening occupying the second layer facing surface,
The secondary dressing material is a diaper ,
An opening ratio of the first opening occupying the wound part covering surface is set to 75 to 95%, and a static friction coefficient of the secondary dressing material facing surface with respect to the secondary dressing material is set to a wound part of the wound part covering surface. A secondary dressing material characterized in that it is set to be smaller than the static friction coefficient with respect to . The secondary dressing material according to claim 1,
When the first layer is interposed between the second layer and the wound part to avoid the second layer directly contacting the wound part, and when an external force acts on the wound covering material, while maintaining the contact between the first layer and the wound, secondary dressing which is characterized by being configured such that the relative movement is created between the second layer and the secondary dressing .

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