CN113712735A - Portable wound surface management dressing - Google Patents

Abstract

The invention relates to a portable wound surface management dressing, which comprises a contact layer, a spacing fabric layer and a covering layer, wherein the spacing fabric layer is positioned on the contact layer; the contact layer is provided with a penetrating liquid seepage through hole; the space fabric layer is a space fabric grey cloth formed by blending a chemical fiber material which is not absorbable for seepage liquid and bacterial cellulose which is absorbable for seepage liquid, and the top surface and the bottom surface are formed by spinning the chemical fiber material which is not absorbable for seepage liquid and the space fabric grey cloth together; the covering layer is provided with a middle area corresponding to the spacing fabric layer and an edge area arranged around the middle area, and the edge area of the covering layer is attached to the contact layer; and negative pressure holes, the negative pressure holes penetrate through the covering layer and the spacer fabric; the wound surface dressing solves the problems that the existing wound surface management dressing has more layers, larger thickness, insufficient plasticity and limited application range, and causes poor treatment effect.

Description

Portable wound surface management dressing

Technical Field

The invention relates to the field of medical equipment, in particular to a portable wound management dressing.

Background

The negative pressure wound surface treatment method is a treatment method which effectively promotes the wound surface to heal and achieves the treatment purpose by connecting a negative pressure suction device with a special wound surface management dressing and then pasting the dressing on the wound surface to enable the wound surface to achieve a negative pressure state. The negative pressure wound therapy can effectively control wound infection and promote wound healing.

At present, two types of wound surface management dressings are mainly used for negative pressure wound surface treatment, one type is a traditional wound surface management dressing matched with a negative pressure bottle or a pot, and the other type is a novel portable wound surface management dressing which carries an absorption material and does not need to be matched with the negative pressure bottle or the pot for use. The former is a traditional negative pressure treatment system, and has the problems of large and expensive treatment device, tedious and time-consuming use and relative insanitation in treatment. The latter products are all composed of 4-6 layers of materials, wherein most products design a liquid transmission layer and a liquid absorption layer in the dressing into two parts, which respectively play different functions, thus increasing the weight of the product and increasing the burden of a patient to a certain extent, and after absorbing liquid, the absorption layer becomes thicker and heavier along with the increase of the absorption volume of the liquid, and the thickening of the dressing increases the possibility of the dressing falling off. For example, CN211300663U discloses a medical device for managing the exudation of damaged tissue, which comprises a substrate layer, a conductive layer, a liquid storage layer and an air exhaust layer, wherein the substrate layer, the conductive layer, the liquid storage layer and the air exhaust layer are connected together and have parts connected together in sequence; the liquid storage layer and the exhaust layer form a liquid storage and exhaust part, and the liquid storage and exhaust part is provided with a negative pressure hole which penetrates through the liquid storage and exhaust part; and the base layer is provided with a penetrating liquid seepage through hole. The dressing is used for negative pressure treatment, the possibility that the dressing falls off after liquid is absorbed still exists, the number of layers of the dressing is large, the thickness of the dressing is large, the conduction of negative pressure is more unfavorable for negative pressure treatment, and then the negative pressure effect of an affected part is influenced, and the treatment effect is influenced.

Disclosure of Invention

The invention aims to provide a portable wound management dressing, which solves the problems of poor treatment effect caused by more layers, larger thickness, insufficient plasticity and limited use range (such as joints, easy falling off when used at corners and small contact area between the dressing and wounds) of the conventional wound management dressing.

The specific scheme is as follows:

a portable wound management dressing comprising a contact layer, a spacer textile layer on the contact layer and a cover layer covering the spacer textile layer;

the contact layer is provided with a penetrating liquid seepage through hole;

the space fabric layer is a multifunctional layer integrating four functions of steam transmission, liquid seepage absorption, dressing structure support and liquid seepage storage, and is a space fabric grey cloth formed by blending chemical fiber materials which are not absorbable to liquid seepage and bacterial cellulose which is absorbable to liquid seepage, the space fabric grey cloth is provided with a top surface far away from a wound surface and a bottom surface close to the wound surface, and the top surface and the bottom surface are formed by spinning the chemical fiber materials which are not absorbable to liquid seepage and the space fabric grey cloth together;

the covering layer is provided with a middle area corresponding to the spacing fabric layer and an edge area arranged around the middle area, and the edge area of the covering layer is attached to the contact layer;

and negative pressure holes penetrating the cover layer and the spacer fabric.

Furthermore, the top surface and the bottom surface of the spacer fabric grey cloth are provided with meshes.

Furthermore, meshes on the top surface and the bottom surface of the grey cloth of the spacer fabric are rhombic or regular polygonal, and the area of each mesh is 4mm²-25mm²。

Furthermore, the contact layer is a colloidal silica gel layer with holes, and the holes on the silica gel layer are used as liquid seepage through holes.

Furthermore, the pore size on the silica gel layer comprises small pores with small pore diameters and large pores with large pore diameters, and the large pores and the small pores with the small pore diameters are arranged in a crossed manner.

Furthermore, the pore diameter of the small pore is 1-1.5mm, and the pore diameter of the large pore is 2-3 mm.

Furthermore, the middle area of the covering layer is provided with rhombic three-dimensional protrusions formed by triangles on two opposite sides.

Furthermore, the side length of the triangle is 3-8 mm.

Furthermore, the covering layer is composed of a polyurethane film and medical pressure-sensitive adhesive, the medical pressure-sensitive adhesive is arranged on the edge of the edge area corresponding to the polyurethane film, and the edge of the covering layer is attached to the contact layer through the medical pressure-sensitive adhesive.

Compared with the prior art, the portable wound management dressing provided by the invention has the following advantages: the spacing fabric layer in the portable wound surface management dressing provided by the invention integrates the four functions of steam transmission, seepage absorption, dressing supporting structure and seepage storage into a multifunctional layer, so that the portable wound surface management dressing has a three-layer structure, the thickness of a product is greatly reduced, the use comfort of a patient is increased, the resistance of negative pressure conduction is reduced, the negative pressure hole directly reaches the contact layer, the resistance caused by the middle layer of the dressing is avoided, a negative pressure pump can be used for a longer time under the condition of the same electric power, and simultaneously, the uniformity of negative pressure on the device is increased due to the reduction of the resistance, and the negative pressure of the same degree can be realized at each place of the wound surface to enable the wound surface to heal more quickly.

Drawings

Fig. 1 shows a schematic cross-sectional view of a portable wound management dressing.

Fig. 2 shows a schematic view of a contact layer.

Figure 3 shows a schematic cross-sectional view of a spacer fabric layer.

Figure 4 shows a schematic view of the top or bottom surface of the spacer fabric layer.

Fig. 5 shows a schematic view of the cover layer.

Fig. 6 shows a schematic view of a relief on the middle area of the cover layer.

Figure 7 shows a comparison of water vapour transmission rates for different forms of each fabric.

Figure 8 shows a graph comparing the absorbent capacity of absorbent layers of different dressings.

Figure 9 shows a comparison of the power source usage times for different dressings under the same conditions.

Fig. 10 shows a schematic diagram of an experimental device for simulating seepage absorption during the use time of a power supply.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1-5, the present embodiment provides a portable wound management dressing, which includes acontact layer 1, aspacer fabric layer 2 on thecontact layer 1, acover layer 3 covering thespacer fabric layer 2, and anegative pressure hole 4, wherein thenegative pressure hole 4 penetrates through thecover layer 3 and thespacer fabric 2.

Wherein, referring to fig. 2, the contact layer is a layer of material contacting the wound, and the contact layer is provided with a penetrating weep hole. The contact layer is preferably a silica gel layer made of medical silica gel material, the silica gel layer is a layer of porous colloidal layer, and pores on the silica gel layer are used as seepage through holes. More preferably, the pore size on the silica gel layer comprisessmall pores 12 with small pore diameter andlarge pores 11 with large pore diameter, the pore diameter of the small pores is 1-1.5mm, the pore diameter of the large pores is 2-3mm, and the large pores and the small pores with the two pore diameters are arranged in a cross way, so that the covering layer with high viscosity and the contact layer with mild viscosity form a mutual neutralization state, the requirement on no damage to skin is met, the viscosity is strong enough, and the strip-shaped adhesive tape with reinforced edges used in the traditional portable negative pressure liquid seepage management device is reduced.

Compared with the existing portable negative pressure exudate management device, the absorption layer for absorbing exudate of the existing exudate management device is arranged above the transmission layer for transmitting steam, the absorption layer for absorbing exudate cannot contact with a wound, and the wound becomes dry under the condition of rapid evaporation of exudate, which violates the moist wound healing theory. The contact layer of the embodiment contacts with the wound, but the contact layer is porous, and thespacing fabric layer 2 also has the function of absorbing seepage liquid and can partially contact with the wound, so that certain humidity of the wound is maintained, and the wound healing is promoted under certain humidity condition while negative pressure treatment is carried out.

Referring to fig. 3, thespacer textile layer 2 is a multi-functional layer integrating vapor transmission, liquid permeation absorption, dressing structure support and liquid permeation storage. Thespacing fabric layer 2 is a spacing fabric grey cloth formed by blending a chemical fiber material which is not absorbable by seepage liquid and bacterial cellulose which is absorbable by seepage liquid, the spacing fabricgrey cloth 2 is provided with atop surface 21 far away from a wound surface and abottom surface 22 close to the wound surface, thetop surface 21 and thebottom surface 22 are formed by spinning the chemical fiber material which is not absorbable by seepage liquid and the spacing fabric grey cloth together, the chemical fiber material which is not absorbable by seepage liquid is mainly responsible for supporting a spacing fabric structure, the bacterial cellulose which can absorb seepage liquid is mainly responsible for absorbing and storing seepage liquid, the chemical fiber material which is not absorbable forms a channel for supporting the spacing fabric structure and has good air permeability of the bacterial cellulose, and the two capacities jointly realize excellent steam transmission capacity of the spacing fabric.

In this embodiment, polyester fibers are spun as a raw material to form the top surface and the bottom surface, and the spacer fabric grey cloth is a spacer yarn formed by mixing the polyester fibers and bacterial cellulose. The specific operation mode is that on a double needle raschel machine, chemical fiber materials and bacterial cellulose are blended and woven together, the chemical fiber materials are woven to form the top surface and the bottom surface of a diamond mesh structure, and the chemical fiber materials and the bacterial cellulose are blended to form the spacer fabric grey cloth. Wherein the polyester fiber can be replaced by other non-absorbable chemical fiber materials. Structure of top and bottom surfaces referring to fig. 4, the fabric of the top and bottom surfaces is formed in a diamond or regular polygonal shape, so that it has excellent steam transmission capability while having good strength. The area of each mesh is controlled to be 4mm²-25mm²。

Referring to fig. 5 and 6, thecover layer 3 is composed of a polyurethane film and a medical pressure-sensitive adhesive, and has acentral region 31 corresponding to thespacer fabric layer 2 and anedge region 32 disposed around thecentral region 31, and the medical pressure-sensitive adhesive is disposed on theedge region 32 so that the edge of thecover layer 3 can be attached to thecontact layer 1. In the present embodiment, themiddle area 31 has a diamond-shaped three-dimensional protrusion 33 formed by triangles on two opposite sides, and the side length of the triangle is 3-8 mm.

The design of three-dimensional arch 33 has increased the ventilative area ofmiddle zone 31, compare traditional negative pressure infiltration liquid management device (dressing), its vapor transmission rate is bigger, this means that the moisture in the infiltration liquid can be discharged fast automatically, this is the important reason that the portable wound surface management dressing that this embodiment provided does not need the drainage jar as negative pressure wound surface treatment, and can also volatilize the unnecessary liquid of storage outside the device, the most moderate moist degree of keeping device reaches the requirement of the moist healing theory of wound, in order to promote granulation growth wound healing.

Compared with the negative pressure type portable dressing on the market at present, due to the three-dimensional convex design, the evaporative and breathable area is increased, the steam transmittance is increased, and meanwhile due to the convex design, the whole liquid seepage management device has plasticity, so that the dressing as the portable negative pressure treatment can be applied to the human body with bulges, such as joints and corners of the body; meanwhile, the adhesive property and the viscosity of the portable liquid seepage management device can be ensured, so that the application range of the portable liquid seepage management device is expanded; and because of the evaporation of moisture, the patient keeps the light-weight dressing on the patient all the time in the use process, so that the patient can use the dressing more comfortably.

The interval fabric layer collection transmission steam in the middle of the portable surface of a wound management dressing that this embodiment provided, absorb the sepage, support the dressing structure, store the sepage four in one be multi-functional layer for this portable surface of a wound management dressing only has three layer construction, makes product thickness reduce greatly, increases patient's use comfort, has reduced the resistance of negative pressure conduction simultaneously, makes the negative pressure pump can use longer time under the condition of same electric power. Simultaneously, the uniformity of the negative pressure on the device is increased due to the reduction of the resistance, and the negative pressure can be quickly healed at each position of the wound surface.

The portable wound management dressing provided by this embodiment is now compared with prior art dressings to verify its effectiveness.

Referring to fig. 7, fig. 7 is a graph showing a comparison of water vapor transmission rates for different forms of each fabric, wherein a in fig. 7 is the water vapor transmission rate of the dried pure bacterial cellulose fabric; b in FIG. 7 is the water vapor transmission rate of the pure bacterial cellulose fabric in the saturated state of the absorption liquid; FIG. 7, C, is the water vapor transmission rate of the dried spacer fabric layer of the present embodiment; FIG. 7D is the water vapor transmission rate of the spacer fabric layer of the present embodiment in a state of saturation with an absorbent liquid; in fig. 7E is the water vapor transmission rate of the dried purified fiber spacer fabric.

The water vapor transport capacity of the fabric can be evaluated by the water vapor transmission rate of the material, and figure 1 shows that the dry pure bacterial cellulose fabric has a large water vapor transmission rate, and the water vapor transmission rate is 8482 g.m^-2·24h^-1Near water vapor transmission rate of dry purified fiber spacer fabric (10200 g m)^-2·24h^-1) However, after absorbing the liquid, the water vapor permeability can be maintained at 2984g · m by virtue of the unique pore structure of the bacterial cellulose^-2·24h^-1But is greatly reduced compared with the dried pure bacterial cellulose fabric. The space fabric provided by the embodiment adopts the space fabric consisting of chemical fibers and bacterial fibers which do not absorb liquid, and the space fabric reaches 11280 g.m when being dried^-2·24h^-1The water vapor permeability of (2) and the presence of chemical fiber which does not absorb liquid, while providing a supporting force to the spacer fabric structure, the water vapor permeability can be maintained at 8600 g.m.even after the fabric absorbs liquid^-2·24h^-1At the same level as the dried pure bacterial cellulose fabric and close to the water vapor transmission rate level of the dried purified cellulose spacer fabric. The air permeability of dressing products on the market needs to be more than 3000 g.m^-2·24h^-1，Excellent transmission capability can be achieved. The water vapor transmission rate of the spacing fabric layer provided by the embodiment after absorbing seepage is far more than 3000 g.m^-2·24h^-1It is proved that the composite material still has excellent vapor transmission capacity after absorbing seepage.

In addition, the steam permeation of the pure chemical fiber spacer fabric without the absorption capacity is totally dependent on the gap of the spacer fabric, and the spacer fabric blended by the bacterial cellulose and the chemical fiber materials has certain pores and can be ventilated in a dry state due to the existence of certain pores in the materials of the bacterial cellulose; therefore, the steam transmission of the spacing fabric formed by blending the bacterial cellulose and the chemical fiber materials depends on the clearance of the spacing fabric and the pores of the bacterial cellulose, so that the steam transmission rate of the spacing fabric formed by blending the bacterial cellulose and the chemical fiber materials is slightly higher than that of the pure chemical fiber spacing fabric under the drying condition.

Referring to fig. 8, fig. 8 is a graph showing the comparison of the absorption capacity of the absorbent layers of different dressings, wherein a in fig. 8 is the spacer fabric provided in the present embodiment, B in fig. 8 is the PICO dressing absorbent layer (schlenhui 10 × 20cm portable dressing), and C in fig. 8 is the pure bacterial cellulose absorbent layer, which was tested according to the test method of YY/T-0471.13.2, and it can be seen that the absorption capacity of the spacer fabric provided in the present embodiment can be maintained at 40g/g, which is superior to that of the existing PICO dressing absorbent layer (30 g/g). Although the absorption performance of pure bacterial cellulose can reach 100g/g, the steam transmittance of the pure bacterial cellulose after absorbing seepage is greatly reduced compared with that of dry bacterial cellulose, and the requirement of the steam transmittance is difficult to meet.

Referring to fig. 9, fig. 9 is a graph showing comparison of power source usage duration of different dressings under the same conditions, wherein a in fig. 9 is a portable wound management dressing provided in the present embodiment, B in fig. 9 is a PICO dressing (schlerhui 10 × 20cm portable dressing), and C in fig. 9 is a conventional negative pressure drainage dressing (polyurethane negative pressure drainage dressing with exudate collection canister). All the negative pressure pumps matched with the three dressings use the 2-joint all-new Nanfu 5 battery to perform in-vitro simulation of seepage (the seepage is simulated by using physiological saline) absorption for continuous test (the schematic diagram of an experimental device is shown in figure 10), and the service life of the power supply of the negative pressure pump is recorded to explain the resistance condition of each dressing. The larger the resistance is, the larger the working energy consumption of the negative pressure pump is, and the shorter the working time of the power supply is, so that the dressing resistance condition is indirectly researched and compared. As can be seen from fig. 9, the power source of the portable wound management dressing provided in this embodiment is used for about 120 hours, which is slightly shorter than that of the conventional negative pressure drainage dressing, while the power source of the representative PICO dressing of the conventional portable dressing type is used for only about 72 hours, which indirectly indicates that the resistance of the portable wound management dressing provided in this embodiment after absorbing the exudate is still very small, and although the portable wound management dressing is not as good as the conventional negative pressure drainage dressing of the fluid reservoir, the portable wound management dressing can be greatly superior to the conventional negative pressure portable dressing.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A portable wound management dressing characterized by: comprises a contact layer, a spacing fabric layer positioned on the contact layer and a covering layer covering the spacing fabric layer;

the contact layer is provided with a penetrating liquid seepage through hole;

the space fabric layer is a multifunctional layer integrating four functions of steam transmission, liquid seepage absorption, dressing structure support and liquid seepage storage, and is a space fabric grey cloth formed by blending chemical fiber materials which are not absorbable to liquid seepage and bacterial cellulose which is absorbable to liquid seepage, the space fabric grey cloth is provided with a top surface far away from a wound surface and a bottom surface close to the wound surface, and the top surface and the bottom surface are formed by spinning the chemical fiber materials which are not absorbable to liquid seepage and the space fabric grey cloth together;

the covering layer is provided with a middle area corresponding to the spacing fabric layer and an edge area arranged around the middle area, and the edge area of the covering layer is attached to the contact layer;

and negative pressure holes penetrating the cover layer and the spacer fabric.

2. A portable wound management dressing according to claim 1, wherein: the top surface and the bottom surface of the spacer fabric grey cloth are both provided with meshes.

3. A portable wound management dressing according to claim 2, wherein: the meshes on the top surface and the bottom surface of the grey cloth of the spacer fabric are rhombic or regular polygonal, and the area of each mesh is 4mm²-25mm²。

4. A portable wound management dressing according to claim 1, wherein: the contact layer is a colloidal silica gel layer with holes, and the holes on the silica gel layer are used as liquid seepage through holes.

5. A portable wound management dressing according to claim 4, wherein: the pore size on the silica gel layer comprises small pores with small pore diameters and large pores with large pore diameters, and the large pores and the small pores with the small pore diameters are arranged in a crossed manner.

6. A portable wound management dressing according to claim 5, wherein: the aperture of the small hole is 1-1.5mm, and the aperture of the large hole is 2-3 mm.

7. A portable wound management dressing according to claim 1, wherein: the middle area of the covering layer is provided with a rhombic three-dimensional bulge formed by triangles on two opposite sides.

8. A portable wound management dressing according to claim 7, wherein: the side length of the triangle is 3-8 mm.

9. A portable wound management dressing according to claim 1, wherein: the covering layer is composed of a polyurethane film and medical pressure-sensitive adhesive, the medical pressure-sensitive adhesive is arranged on the edge of the edge area corresponding to the polyurethane film, and the edge of the covering layer is attached to the contact layer through the medical pressure-sensitive adhesive.

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