Medical polyurethane dressing and wound surface negative pressure drainage dressing assembly

Abstract

The utility model discloses a medical polyurethane dressing and a wound surface negative pressure drainage dressing assembly. The medical polyurethane dressing is provided with a plurality of strip-shaped dressing base bodies or a single strip-shaped dressing base body which is made of medical polyurethane foaming materials, and an integral plane structure which is easy to tear is formed through intermittent connecting bridges or spiral gaps. The integrality of the dressing is guaranteed, manual tearing according to needs can be achieved without tools, medical staff can directly tear the dressing according to the shape of a wound surface to obtain the dressing with the matched size, and chipping pollution and infection risks caused by traditional cutting operation are avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a medical polyurethane dressing and a wound negative pressure drainage dressing assembly. Background Technology

[0002] Vacuum-assisted closure (VAC) is a novel wound treatment technique that combines negative pressure drainage with occlusive dressings. The principle is as follows: a porous medical foam dressing is used to cover or fill the wound, with a semi-permeable membrane forming a sealed space. A controlled negative pressure source is connected via a drainage tube to form a closed drainage system. This technique promotes granulation tissue growth through physical stimulation and biomechanical effects. Clinical studies have shown significant efficacy for acute and chronic full-thickness wounds, deep sinus tracts, and refractory wounds unresponsive to traditional surgical treatments. It is superior to traditional dressing changes in terms of healing speed, cost-effectiveness, and ease of medical and nursing procedures.

[0003] The existing VAC system mainly consists of three core components: (1) a porous foam dressing as a drainage medium; (2) a semi-permeable membrane to maintain the closed environment of the wound; and (3) an intelligent control device that provides a negative pressure source. Among them, the physical properties of the foam dressing directly affect the drainage effect. Currently, two types of materials are mainly used in clinical practice: polyvinyl alcohol sponge and medical polyurethane sponge. In comparison, medical polyurethane sponge has become the mainstream choice in the market because of its three-dimensional interpenetrating network structure with better porosity and liquid permeability.

[0004] The current manufacturing process of medical polyurethane drainage sponges typically uses polyester / polyether polyol and toluene diisocyanate as the base material, supplemented with foaming agents, catalysts and other additives, and then chemically foamed and molded before sterilization to produce standard-sized products. However, the following technical bottlenecks have been exposed in clinical applications: (1) Existing products are all of fixed size and specifications, and medical staff need to cut and adapt them according to the wound morphology during the operation. This process not only increases the operation time, but also makes it easier to cause nosocomial infection due to contact contamination; (2) Material debris generated from secondary cutting and processing may remain inside the wound cavity and form a foreign body reaction. These problems restrict the clinical promotion and application safety of VAC technology. Utility Model Content

[0005] In order to overcome the above-mentioned defects of existing polyurethane drainage sponges, this utility model provides a medical polyurethane dressing and a wound negative pressure drainage dressing assembly.

[0006] The technical solution adopted by this utility model is as follows: a medical polyurethane dressing, having multiple or single strip-shaped dressing substrates made of medical polyurethane foam material, arranged in a preset spatial arrangement to form an easily tearable integral planar structure.

[0007] Preferably, the dressing substrate consists of multiple independent strips that are bonded together and connected to each other by intermittently arranged connecting bridges to form an integral planar structure.

[0008] Preferably, the independent strip includes a central strip and several closed annular strips, and the several annular strips are nested on the outer periphery of the central strip in an increasing order of size from the inside to the outside on the plane; the connecting bridge is uniformly arranged circumferentially between adjacent central strips and annular strips, and between two adjacent annular strips.

[0009] Preferably, the shape of the annular strip is one of ellipse, circle or polygon.

[0010] Preferably, the length and width dimensions of the connecting bridge are 1mm to 3mm.

[0011] Preferably, the dressing substrate is a single continuous strip, which is formed into an integral planar structure by two-dimensional spiral winding.

[0012] Preferably, the porosity of the dressing matrix is ​​90% to 95%, the average pore size is 500 μm to 800 μm, and the pore connectivity is ≥85%.

[0013] The second technical solution adopted by this utility model is as follows: a wound negative pressure drainage dressing assembly, comprising: the aforementioned medical polyurethane dressing; a breathable sealing layer covering the upper surface of the medical polyurethane dressing, with the edges extending outward to form a sealing area; a negative pressure suction cup having a disc body and a negative pressure connecting pipe, the disc body being fixed on the breathable sealing layer and in contact with the medical polyurethane dressing, and the negative pressure connecting pipe being connected to a negative pressure source.

[0014] Preferably, the breathable sealing layer is composed of a multi-layer composite film, consisting of a contact layer, a functional layer, and a substrate layer from the inside out.

[0015] Preferably, the negative pressure pipe has a vent and is equipped with a removable plug.

[0016] This utility model has the following beneficial effects:

[0017] 1. Tearability and shape adaptability: The strip-shaped dressing substrate forms an easily tearable integral planar structure through intermittent connecting bridges or spiral gaps, which not only ensures the integrity of the dressing, but also enables manual tearing as needed without tools. Medical staff can directly tear off the appropriate size according to the shape of the wound, avoiding the risk of debris contamination and infection caused by traditional cutting operations.

[0018] 2. High efficiency in drainage and tissue compatibility: The dressing matrix has an open porosity of up to 90% to 95%, an average pore size of 500 μm to 800 μm, and a pore connectivity rate of ≥85%, forming a three-dimensional interpenetrating network channel that can quickly absorb exudate and evenly distribute negative pressure, avoiding damage to granulation tissue caused by local pressure concentration.

[0019] 3. Enhanced antibacterial and airtight properties: The breathable sealing layer is composed of multiple composite membranes, which not only achieves breathability and impermeability, but also inhibits bacteria, and has better mechanical strength and dimensional stability, adapting to the deformation of dynamic parts such as joints;

[0020] 4. Improved ease of operation: The negative pressure suction cup integrates a vent and a removable plug, which can quickly release pressure to remove the dressing assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first embodiment of the present invention.

[0022] Figure 2 This is an enlarged schematic diagram of point A in the first embodiment of this utility model.

[0023] Figure 3 This is a schematic diagram of the second embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the third embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the negative pressure suction cup in the third embodiment of this utility model.

[0026] Figure 6 This is a schematic diagram of the negative pressure suction cup in the third embodiment of this utility model (with the vent open).

[0027] Medical polyurethane dressing 1, with independent strip 101, central strip 101a, annular strip 101b, connecting bridge 102, and continuous strip 103;

[0028] Breathable sealing layer 2;

[0029] Negative pressure suction cup 3, disc body 301, negative pressure connecting pipe 302, venting port 303, detachable plug 304. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0031] In Example 1, as Figure 1 , Figure 2As shown, a medical polyurethane dressing has multiple strip-shaped dressing substrates made of medical polyurethane foam material, arranged in a preset spatial pattern to form an easily tearable integral planar structure. Specifically: the dressing substrate consists of multiple independent strips 101, including a central strip 101a and several closed annular strips 101b. The several annular strips 101b are nested around the outer periphery of the central strip 101a in an increasing order of size from the inside out on the plane. The annular strips 101b are elliptical, but can also be circular or polygonal depending on the requirements. Connecting bridges 102 are evenly arranged circumferentially between adjacent central strips 101a and annular strips 101b, and between two adjacent annular strips 101b. This structure, through intermittently arranged connecting bridges 102, connects multiple independent strips 101 into a single, easily tearable planar structure. This ensures the integrity of the dressing while enabling manual, on-demand tearing without tools. Medical staff can directly tear off the appropriate size according to the shape of the wound, avoiding the risk of debris contamination and infection caused by traditional cutting operations.

[0032] In Example 1, as Figure 1 , Figure 2 As shown, the length and width dimensions of the connecting bridge 102 are 1mm to 3mm. This structure is actually cut from a single piece of medical polyurethane foam material. Therefore, the length dimension of the connecting bridge 102 ensures the integrity of the dressing while facilitating production and processing. The width dimension of the connecting bridge 102 ensures a precise fracture path and a clean fracture surface, and also prevents the foam structure from collapsing.

[0033] In Example 1, the dressing matrix has a porosity of 90%–95%, an average pore size of 500 μm–800 μm, and a pore connectivity of ≥85%. This dressing matrix forms a three-dimensional interpenetrating network of channels, which can quickly absorb exudate and evenly distribute negative pressure, avoiding damage to granulation tissue caused by localized pressure concentration. Generally, dressings with larger pore sizes are more suitable for deep wounds or wounds with large cavities, to better fill and maintain the structure, while dressings with smaller pore sizes are more suitable for superficial wounds or wounds requiring precise pressure control. Therefore, this example adjusts the average pore size to a suitable range of 500 μm–800 μm, expanding the dressing's applicable scenarios. A pore size of 500 μm–800 μm also allows the dressing to maintain a certain degree of structural stability, preventing excessive collapse and deformation under negative pressure. In addition, a larger porosity can significantly increase fluid throughput, while sufficient pore connectivity ensures uniform conduction of negative pressure and reduces pressure attenuation.

[0034] In Example 2, as Figure 3As shown, another form of medical polyurethane dressing has a strip-shaped dressing substrate made of medical polyurethane foam material. The dressing substrate is a single continuous strip 103, which is formed into an integral planar structure by two-dimensional spiral winding. This structure only requires a single continuous strip 103 to form an integral planar structure, and the structure is more stable compared to Embodiment 1. However, when medical staff tear off the appropriate size, they need to cut the continuous strip 103 instead of the connecting bridge 102, so the operation is slightly more troublesome, and the risk of debris contamination and infection is also slightly higher.

[0035] In Example 3, as Figures 4-6 The image shows a wound negative pressure drainage dressing assembly, comprising: a medical polyurethane dressing 1 as described in Example 1; a breathable sealing layer 2 covering the upper surface of the medical polyurethane dressing 1, with its edges extending outward to form a sealing area; and a negative pressure suction cup 3, having a disc body 301 and a negative pressure connecting pipe 302. The disc body 301 is fixed to the breathable sealing layer 2 and adheres to the medical polyurethane dressing 1, while the negative pressure connecting pipe 302 is connected to a negative pressure source. The negative pressure source connected to the negative pressure connecting pipe 302 can be a negative pressure therapy device disclosed in patent document CN217938783U. After the medical polyurethane dressing 1 is torn or cut to the appropriate size, it forms a complete dressing assembly with the breathable sealing layer 2 and the negative pressure suction cup 3. In conjunction with the negative pressure therapy device, it achieves closed negative pressure drainage treatment of the wound.

[0036] In Example 3, the breathable sealing layer 2 is composed of a multi-layer composite membrane, consisting of a contact layer, a functional layer, and a substrate layer from the inside out. The breathable sealing layer 2 can be a polyurethane / polyacrylic acid / polyester (PU / PAA / PET) composite membrane, wherein: the polyurethane layer serves as the contact layer, possessing excellent biocompatibility and suitable for adhering to wound surfaces; the polyacrylic acid layer serves as the functional layer, possessing hydrophilicity and ion exchange capacity, and can combine with antibacterial agents or other functional agents to provide sustained antibacterial or other effects; the polyester layer serves as the substrate layer, potentially providing better mechanical strength and dimensional stability. Alternatively, the breathable sealing layer 2 can be a multi-layer co-extruded membrane formed by a polyurethane porous membrane / nano silver coating / silicone elastomer layer, wherein: the polyurethane porous membrane serves as the contact layer, achieving excellent breathability and impermeability; the nano silver coating serves as the functional layer, inhibiting bacterial proliferation through the release of nano silver ions; and the silicone layer serves as the substrate layer, providing a soft and conforming sealing interface, adapting to the deformation of dynamic areas such as joints.

[0037] In Example 3, as Figures 4-6 As shown, the negative pressure pipe 302 has a vent 303 and is equipped with a removable plug 304. Figure 4 , Figure 5 In the middle, the plug 304 blocks the vent 303, which is in a negative pressure drainage state; Figure 6 In the middle, the plug 304 is pulled out, the vent 303 is opened, the vacuum environment between the medical polyurethane dressing 1 and the breathable sealing layer 2 is destroyed, and the pressure is quickly released to facilitate the disassembly of the dressing assembly.

[0038] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A medical polyurethane dressing, characterized in that, It has a multi- or single strip dressing substrate made of medical polyurethane foam material, arranged in a preset spatial arrangement to form an easily tearable integral planar structure.

2. The medical polyurethane dressing according to claim 1, characterized in that, The dressing substrate consists of multiple independent strips (101), which are connected to each other through intermittently arranged connecting bridges (102) to form an integral planar structure.

3. The medical polyurethane dressing according to claim 2, characterized in that, The independent strip (101) includes a central strip (101a) and several closed annular strips (101b). The several annular strips (101b) are nested on the outer periphery of the central strip (101a) in an increasing order of size from the inside to the outside on the plane. The connecting bridge (102) is uniformly arranged circumferentially between adjacent central strips (101a) and annular strips (101b) and between two adjacent annular strips (101b).

4. The medical polyurethane dressing according to claim 3, characterized in that, The annular strip (101b) is elliptical, circular, or polygonal in shape.

5. The medical polyurethane dressing according to claim 2, characterized in that, The length and width of the connecting bridge (102) are 1mm to 3mm.

6. The medical polyurethane dressing according to claim 1, characterized in that, The dressing substrate is a single continuous strip (103) that is formed into an integral planar structure by two-dimensional spiral winding.

7. The medical polyurethane dressing according to claim 1, characterized in that, The porosity of the dressing matrix is ​​90% to 95%, the average pore size is 500 μm to 800 μm, and the pore connectivity is ≥85%.

8. A wound negative pressure drainage dressing assembly, characterized in that, include: The medical polyurethane dressing (1) according to any one of claims 1 to 7; A breathable sealing layer (2) covers the upper surface of the medical polyurethane dressing (1), with its edges extending outward to form a sealing area; The negative pressure suction cup (3) has a plate body (301) and a negative pressure connector (302). The plate body (301) is fixed on the breathable sealing layer (2) and is attached to the medical polyurethane dressing (1). The negative pressure connector (302) is connected to the negative pressure source.

9. The wound negative pressure drainage dressing assembly according to claim 8, characterized in that, The breathable sealing layer (2) is composed of multiple composite films, which are, from the inside out, a contact layer, a functional layer and a substrate layer.

10. The wound negative pressure drainage dressing assembly according to claim 8, characterized in that, The negative pressure pipe (302) is provided with a vent (303) and a removable plug (304).

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