Portable multi-layer negative pressure wound dressing

Abstract

The application provides a portable multilayer negative pressure drainage dressing, and relates to the field of medical devices.The portable multilayer negative pressure drainage dressing comprises, from bottom to top, a wound contact layer, a dressing core and a sealing film in sequence; the wound contact layer is a hydrogel structure; the dressing core is connected to a first surface of the wound contact layer; the sealing film is arranged on the first surface of the wound contact layer and forms a containing cavity with the wound contact layer; and the dressing core is arranged in the containing cavity.The portable multilayer negative pressure drainage dressing provided by the application solves the technical problems of high cost, low liquid absorption volume and poor sealing effect of the negative pressure closed drainage device in the prior art.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more specifically, to a portable multilayer negative pressure drainage dressing. Background Technology

[0002] Negative pressure wound therapy (NPWT), as an innovative surgical drainage method, greatly optimizes wound drainage through a continuous and controllable negative pressure environment. It effectively prevents fluid accumulation, promotes the efficient removal of necrotic tissue and exudate, thereby accelerating the closure of infected cavities and the overall wound healing process. However, existing NPWT products have the following problems: 1. High material costs and frequent maintenance: Existing products generally use soft silicone materials for the wound contact layer. Because this type of material lacks efficient liquid absorption, it is easily saturated quickly when dealing with wounds with moderate exudation, forcing dressing changes to be increased to 1-2 times per day. This not only directly increases treatment costs but also adds to the burden of patient care.

[0003] 2. Insufficient exudate handling capacity leading to system failure: Existing dressings rely on the passive storage of fluid in the fiber core layer, which has weak lateral diffusion capacity and is prone to localized fluid accumulation. Especially when dealing with highly viscous exudate, the fiber pore blockage rate is as high as 60% or more, significantly reducing the effective absorbent volume. This structural defect forces the clinical need for external drainage cups, deviating from the original "portable" design intention.

[0004] 3. Multi-layered stacking structure leads to seal failure: Due to the rigid thickness of the core layer, when the sealing film directly covers the stepped fracture surface, it is prone to edge lifting in stress concentration areas. Clinical data shows that existing dressings have an air leakage rate of up to 28% in active areas, forcing reliance on auxiliary sealing tape for remedial purposes, which in turn exacerbates the risk of skin maceration. Utility Model Content

[0005] The purpose of this application is to provide a portable multi-layer negative pressure drainage dressing to alleviate the technical problems of high cost, low absorbent volume and poor sealing effect of existing negative pressure closed drainage devices.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: The portable multi-layer negative pressure drainage dressing provided by this utility model includes, from bottom to top, a wound contact layer, a dressing core, and a sealing film; The wound contact layer has a hydrocolloid structure; The dressing core is connected to the first surface of the wound contact layer; The sealing film is applied to the first surface of the wound contact layer and forms a receiving cavity with the wound contact layer; wherein the dressing core is placed inside the receiving cavity.

[0007] Furthermore, the wound contact layer has multiple spaced-apart drainage holes that extend along the thickness of the wound contact layer and connect to the receiving cavity.

[0008] Furthermore, the sealing membrane is provided with a mounting hole communicating with the receiving cavity, the mounting hole being used to communicate with a negative pressure source.

[0009] Furthermore, the sealing film includes a body and a lip, the body being recessed relative to the lip to form an inner cavity, and the lip being disposed circumferentially along the edge of the body; The lip is connected to the wound contact layer.

[0010] Furthermore, the wound contact layer is ultrasonically welded to the lip.

[0011] Furthermore, the main body includes a top cover and a support portion connected to the circumferential edge of the top cover and extending generally along the thickness direction, the support portion being connected to the lip. The mounting hole is located on the top cover.

[0012] Furthermore, the angle between the support portion and the first surface is set to 50°-90°.

[0013] Furthermore, the top cover portion forms a gap band with a preset width between the first projection area on the first surface and the second projection area on the first surface of the core.

[0014] Furthermore, the depth of the receiving cavity is H, where 2cm ≥ H ≥ 0.5cm.

[0015] Furthermore, the wound contact layer is made of sodium hydroxymethyl cellulose hydrocolloid.

[0016] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows: The portable multi-layer negative pressure drainage dressing provided by this utility model comprises, from bottom to top, a wound contact layer, a dressing core, and a sealing film; the wound contact layer has a hydrocolloid structure; the dressing core is connected to the first surface of the wound contact layer; the sealing film covers the first surface of the wound contact layer and forms a receiving cavity with the wound contact layer; wherein, the dressing core is placed inside the receiving cavity. In this portable multi-layer negative pressure drainage dressing, the sealing film is integrated with the wound contact layer, which serves to contain the dressing core; the wound contact layer has a hydrocolloid structure, which reduces material costs and extends the service life.

[0017] Addressing the issues of high cost and low absorbent capacity in existing negative pressure wound therapy (NPWT) products, this portable multi-layer NPWT dressing features a hydrocolloid structure in the wound contact layer, reducing material costs by 65% ​​compared to existing technologies. The hydrocolloid absorbent rate (greater than 80g / g) significantly extends the usage period, allowing for over 72 hours of use, thus reducing overall treatment costs by 50%. This portable multi-layer NPWT dressing utilizes a sealing membrane and wound contact layer to house the dressing core. This integrated design allows it to fulfill the functions of multiple components required in traditional negative pressure wound therapy, such as sponges, medical films, and suction cup drainage tubes. Furthermore, it eliminates the need for a traditional reservoir for wounds with low to medium osmotic pressure.

[0018] To address the issue of poor sealing performance in existing negative pressure wound therapy products, this portable multi-layer negative pressure wound therapy dressing utilizes a sealing membrane connected to the wound contact layer, forming a cavity between them for filling the dressing core, thus eliminating interlayer discontinuities. The dressing core is embedded and filled into the cavity, forming a smooth contact surface. The connection between the sealing membrane and the wound contact layer reduces air leakage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A cross-sectional view of the portable multilayer negative pressure drainage dressing provided in the embodiments of this application; Figure 2 An exploded view of the portable multilayer negative pressure drainage dressing provided in the embodiments of this application; Figure 3 A cross-sectional view of the sealing membrane in the portable multilayer negative pressure drainage dressing provided in the embodiments of this application.

[0021] icon: 100 - Sealing membrane; 110 - Mounting hole; 120 - Main body; 121 - Top cover; 122 - Support; 130 - Lip; 200-core coating; 300 - Wound contact layer; 310 - Exudate pore; 400 - Reception cavity. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] See Figure 1 and Figure 2 The portable multi-layer negative pressure drainage dressing provided in this embodiment of the utility model includes, from bottom to top, a wound contact layer 300, a dressing core 200, and a sealing film 100; the wound contact layer 300 has a hydrocolloid structure; the dressing core 200 is connected to the first surface of the wound contact layer 300; the sealing film 100 covers the first surface of the wound contact layer 300 and forms a receiving cavity 400 with the wound contact layer 300; wherein, the dressing core 200 is placed in the receiving cavity 400.

[0026] In this portable multi-layer negative pressure drainage dressing, the sealing membrane 100 is integrated with the wound contact layer 300, which contains the dressing core 200. The wound contact layer 300 has a hydrocolloid structure, which reduces material costs and extends the service life.

[0027] Addressing the issues of high cost and low absorbent capacity in existing negative pressure wound therapy (NPWT) products, this portable multi-layer NPWT dressing utilizes a hydrocolloid-based wound contact layer 300, reducing material costs by 65% ​​compared to existing technologies. The hydrocolloid's absorbent rate (greater than 80g / g) significantly extends the usage period, allowing for over 72 hours of use, thus reducing overall treatment costs by 50%. This portable multi-layer NPWT dressing incorporates a sealing membrane 100 and a wound contact layer 300 to house the dressing core 200. This integrated design allows for the functionality of multiple components required for traditional negative pressure wound therapy, such as sponges, medical films, and suction cup drainage tubes.

[0028] To address the issue of poor sealing performance in existing negative pressure wound therapy products, this portable multi-layer negative pressure wound therapy dressing utilizes an open structure in the sealing membrane 100 to connect the sealing membrane 100 with the wound contact layer 300, forming a cavity 400 for filling the dressing core 200, thus eliminating interlayer discontinuities. The dressing core 200 is embedded and filled into the cavity 400, forming a smooth contact surface. The connection between the sealing membrane 100 and the wound contact layer 300 reduces air leakage.

[0029] In this embodiment, the wound contact layer 300, the dressing core 200, and the sealing film 100 are all rectangular, and the wound contact layer 300 can be trimmed according to the size of the patient's wound during use. Of course, the wound contact layer 300, the dressing core 200, and the sealing film 100 can all be circular; or, the wound contact layer 300 can be circular, and the dressing core 200 and the sealing film 100 can be square; or, the wound contact layer 300 can be square, and the dressing core 200 and the sealing film 100 can be circular, etc. The above shapes are within the protection scope of this utility model embodiment as long as the sealing film 100 covers the wound contact layer 300.

[0030] The structure and shape of the sealing membrane 100 are described in detail below: In this embodiment, the sealing membrane 100 is provided with an installation hole 110 communicating with the receiving cavity 400. The installation hole 110 is used to communicate with a negative pressure source. The installation hole 110 of the sealing membrane 100 is used to communicate with the negative pressure source, which creates a continuously controllable negative pressure environment within the receiving cavity 400, optimizing wound drainage and effectively preventing fluid accumulation. This portable multi-layer negative pressure drainage dressing, designed for wounds with low to medium exudate, eliminates the traditional reservoir and, when used with a miniature negative pressure source, significantly reduces the product size and improves portability. The miniature negative pressure source is smaller than the traditional reservoir. The portable multi-layer negative pressure drainage dressing, when used with the miniature negative pressure source, is smaller than existing reservoirs, further enhancing portability.

[0031] In this embodiment, the projected area of ​​the sealing membrane 100 on the horizontal plane is S1, and the projected area of ​​the wound contact layer 300 on the horizontal plane is S2, where S2 > S1. Furthermore, the dimensions of the wound contact layer 300 in each direction on the horizontal plane are larger than the corresponding dimensions of the sealing membrane 100 in the horizontal direction; that is, the sealing membrane 100 covers a portion of the surface of the wound contact layer 300. This arrangement ensures that the wound contact layer 300 completely seals the opening of the sealing membrane 100, preventing air leakage and ensuring sufficient contact area between the wound contact layer 300 and the patient. This enhances the stability of the portable multi-layer negative pressure drainage dressing between the patient and the dressing, preventing problems such as easy detachment during use.

[0032] Furthermore, the wound contact layer 300 is welded to the sealing membrane 100; more specifically, the wound contact layer and the sealing membrane are ultrasonically welded, with a weld interface shear strength ≥0.5 N / mm². 2 This improves the connection strength between the two, ensures the sealing of the cavity 400, and further reduces the leakage rate. During welding, an ultrasonic welding machine is used to weld the wound contact layer 300 to the sealing membrane 100. The core principle of ultrasonic welding is to use the frictional heat generated by high-frequency vibration to locally melt or plastically deform the material, ultimately achieving a solid-state connection. The specific process can be divided into the following steps: Clamping and pressurization: After stacking the sealing membrane 100 and the wound contact layer 300 to be welded in the mold, a certain clamping pressure is applied by the welding head and the base to ensure that the sealing membrane 100 and the wound contact layer 300 are in close contact. High-frequency vibration transmission: The ultrasonic generator converts the mains power, usually 50 / 60Hz, into a high-frequency electrical signal, generally 15kHz~70kHz. The transducer converts the electrical signal into high-frequency mechanical vibration, and then the vibration amplitude is amplified by the amplitude transformer before being transmitted to the welding head. Frictional Heat Generation and Joining: The welding head vibrates at a high frequency, typically with an amplitude of 10~100μm, transmitting heat to the contact surface between the sealing membrane 100 and the wound contact layer 300. The rough peaks between the contact surfaces generate heat due to intense friction and plastic deformation, causing the local temperature to rise to the material's softening point. Simultaneously, under clamping pressure, the material diffuses and fuses, forming a strong joint upon cooling. Vibration Cessation and Pressure Holding: After vibration stops, the pressure is maintained for a period of time to ensure stable cooling and shaping of the joint.

[0033] Furthermore, the sealing membrane 100 includes a body 120 and a lip 130. The body 120 is recessed relative to the lip 130 to form an inner cavity, and the lip 130 is circumferentially disposed along the edge of the body 120. The lip 130 is connected to the wound contact layer 300. The lip 130 provides a contact area between the sealing membrane 100 and the wound contact layer 300, enhancing the connection strength between the two and improving the sealing performance. More specifically, the lip 130 is ultrasonically welded to the wound contact layer 300.

[0034] Further, see Figure 3The main body 120 includes a top cover 121 and a support portion 122 connected to the circumferential edge of the top cover 121 and extending generally along the thickness direction. The support portion 122 is connected to the lip 130. A mounting hole 110 is provided in the top cover 121. The support portion 122 extends obliquely, and the angle between the support portion 122 and the first surface is set to 50°-90°. In use, a negative pressure source communicates with the receiving cavity 400 through the mounting hole 110 to generate negative pressure. The internal cavity is subjected to pressure changes, causing the support portion 122 to deform. Then, the top cover 121 covers the core 200.

[0035] Furthermore, the top cover 121 forms a gap band with a preset width and arranged circumferentially along the edge of the second projection between the first projection area of ​​the first surface and the second projection area of ​​the core 200 on the first surface.

[0036] Furthermore, the sealing membrane 100 is convexly shaped using vacuum forming or hot pressing to form a cavity, with the cavity portion constituting the main body 120. The vacuum forming depth of the sealing membrane 100 is adapted to the cavity, eliminating interlayer discontinuities. Due to the hydrocolloid ion cross-linking mechanism, a gel barrier is formed after liquid absorption, preventing backflow of seepage. Welding of the sealing membrane 100 reduces step discontinuities, resulting in a lower leakage rate in clinical testing.

[0037] Furthermore, the depth of the receiving cavity is H, where 2cm ≥ H ≥ 0.5cm. For example, a depth H of 0.5cm is suitable for superficial wounds. A depth H of 2cm is suitable for hypertonic wounds. It is worth noting that when the depth H is set to 2cm, the material of the dressing 200 is a composite material of PU foam and CMC.

[0038] The structure and shape of the core 200 are described in detail below: In this embodiment, the core 200 is configured as a porous structure, for example, it can be made of PU or PVA foam material.

[0039] The structure and shape of the wound contact layer 300 are described in detail below: In this embodiment, the wound contact layer 300 has a plurality of spaced-apart drainage holes 310 inside, which extend along the thickness direction of the wound contact layer 300 and communicate with the receiving cavity 400. Preferably, the area of ​​the wound contact layer 300 corresponding to the dressing core 200 has a plurality of drainage holes 310, which penetrate the wound contact layer 300 along the thickness direction; the plurality of drainage holes 310 are spaced apart and communicate with the receiving cavity 400. More specifically, the drainage holes 310 are circular or square. The wound contact layer 300 is perforated to form a plurality of drainage holes 310, so that the wound contact layer 300 has the function of conforming to the wound and absorbing drainage.

[0040] Furthermore, the wound contact layer 300 is made of sodium carboxymethyl cellulose hydrocolloid; the wound contact layer 300 uses medical-grade sodium carboxymethyl cellulose (CMC) hydrocolloid instead of the soft polysiloxane contact layer, reducing material costs by 65%. The ion-crosslinking liquid absorption mechanism of medical-grade sodium carboxymethyl cellulose (CMC) hydrocolloid (liquid absorption rate >80g / g) significantly extends the service life to more than 72 hours, reducing the overall treatment cost by 50%.

[0041] Furthermore, the surface of the wound contact layer 300 away from the sealing film 100 is adhesive and is bonded with a release film.

[0042] The following details the usage steps and effects of this portable multi-layer negative pressure drainage dressing: Usage steps: Select the appropriate dressing or cut the wound contact layer 300 according to the shape and size of the wound; peel off the release film on the wound contact layer 300, and then cover the wound with the dressing, which needs to cover the healthy skin around the wound; connect the dressing's installation hole 110 to the negative pressure source through the drainage tube, set the required negative pressure value in the negative pressure source, start the negative pressure source to generate negative pressure, at which point the sealing film 100 collapses and adheres tightly to the dressing core 200.

[0043] Effects: The dressing drains exudate from the wound through negative pressure, reducing the chance of infection; at the same time, negative pressure can promote blood circulation and accelerate wound healing.

[0044] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A portable multi-layer negative pressure drainage dressing, characterized in that, From bottom to top, it includes: wound contact layer, dressing core, and sealing film; The wound contact layer has a hydrocolloid structure; The dressing core is connected to the first surface of the wound contact layer; The sealing film is applied to the first surface of the wound contact layer and forms a receiving cavity with the wound contact layer; wherein the dressing core is placed inside the receiving cavity.

2. The portable multi-layer negative pressure drainage dressing according to claim 1, characterized in that, The wound contact layer has a plurality of spaced-apart drainage holes that extend along the thickness of the wound contact layer and connect to the receiving cavity.

3. The portable multi-layer negative pressure drainage dressing according to claim 1, characterized in that, The sealing membrane is provided with an installation hole that communicates with the receiving cavity, and the installation hole is used to communicate with a negative pressure source.

4. The portable multi-layer negative pressure drainage dressing according to claim 3, characterized in that, The sealing film includes a body and a lip, the body being recessed relative to the lip to form an inner cavity, and the lip being disposed circumferentially along the edge of the body; The lip is connected to the wound contact layer.

5. The portable multi-layer negative pressure drainage dressing according to claim 4, characterized in that, The wound contact layer is ultrasonically welded to the lip.

6. The portable multi-layer negative pressure drainage dressing according to claim 4, characterized in that, The main body includes a top cover and a support portion connected to the circumferential edge of the top cover and extending generally along the thickness direction, the support portion being connected to the lip. The mounting hole is located on the top cover.

7. The portable multi-layer negative pressure drainage dressing according to claim 6, characterized in that, The angle between the support and the first surface is set to 50°-90°.

8. The portable multi-layer negative pressure drainage dressing according to claim 6 or 7, characterized in that, The top cover portion forms a gap band with a preset width between the first projection area on the first surface and the second projection area on the first surface of the core.

9. The portable multi-layer negative pressure drainage dressing according to claim 1, characterized in that, The depth of the receiving cavity is H, where 2cm ≥ H ≥ 0.5cm.

10. The portable multi-layer negative pressure drainage dressing according to claim 1, characterized in that, The wound contact layer is made of sodium hydroxymethyl cellulose hydrocolloid.

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