Abdominal incision negative pressure drainage device

Abstract

The invention relates to a negative pressure drainage device for an abdominal incision. The negative pressure drainage device comprises a gradient flow guide core, a flexible bionic sealing film, a connector bearing part, a negative pressure connecting part and a plurality of anchoring type tension reducing assemblies. The interface bearing part comprises an inner side supporting disc, a membrane penetrating section and an outer side connecting seat, the flexible bionic sealing membrane is clamped between the inner side supporting disc and the outer side connecting seat, an annular sealing convex edge is arranged on the periphery of the membrane penetrating section, a flow guide cavity is formed in the lower side of the inner side supporting disc, and the flow guide cavity is communicated with the gradient flow guide core through a plurality of communicating holes or flow guide windows. The gradient flow guide core comprises a non-adhesion silica gel mesh layer, a PVA macromolecule acetal foam layer and a flat flow guide strip, and the PVA macromolecule acetal foam layer is in a wedge shape. And the plurality of groups of anchoring type tension reducing assemblies are arranged across the abdominal incision. The device can give consideration to sealing and covering of an incision area, negative pressure drainage and tension-reducing fixation, and is suitable for abdominal incision postoperative care.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a negative pressure drainage device for abdominal incisions. Background Technology

[0002] Abdominal surgical incisions, especially emergency surgical incisions and those in obese patients, often face challenges during postoperative healing, such as high tension, excessive exudation, thick fat layers, and poor local blood supply. Current routine treatments often involve suturing followed by gauze coverage, or using a standard negative pressure wound therapy device for surface drainage.

[0003] However, in practical applications, issues such as incision dehiscence, fat liquefaction, deep fluid accumulation, residual dead space, and local infection can still easily occur. For patients with significant abdominal skin folds, excessive sweating, or high sebum secretion, conventional sealing films are prone to problems such as unstable adhesion and air leakage failure. At the same time, traditional surface negative pressure structures usually lack the ability to actively counteract the lateral tension of the incision and are also unable to fully transmit the negative pressure effect to the deep areas of thicker fat layers.

[0004] Therefore, there is an urgent need for a negative pressure drainage device for abdominal incisions that can provide stable sealing, active tension reduction, and deep drainage, in order to improve the postoperative management of high-risk abdominal incisions and reduce the incidence of complications such as incision dehiscence, fat liquefaction, and deep infection.

[0005] A search revealed a Chinese patent document disclosing a negative pressure wound therapy device [Application No.: 202080010380.0, Publication No.: CN113365675A], which includes a dressing interface for connecting a negative pressure source to a dressing. The dressing interface may have a connecting member, which includes an opening, a first adhesive region with a first region peel strength, and a second adhesive region with a second region peel strength less than the first region peel strength. While this patent achieves the goal of creating a sealed therapeutic environment at the tissue site and implementing negative pressure therapy, it includes a tissue interface, a covering, and a mechanism to create a sealed therapeutic environment around the tissue site. However, this invention has the following features: a membrane-type interface carrier, an inner support plate located inside the flexible biomimetic sealing membrane, a flow guiding cavity set on the lower side of the inner support plate, a structure that connects to the gradient flow guiding core through multiple connecting holes or flow guiding windows, and a flat drainage strip and a wedge-shaped PVA polymer acetal foam layer that are inserted through the PVA polymer acetal foam layer and a non-adhesive silicone mesh layer. In terms of membrane bearing stability, intra-membrane negative pressure flow guiding and connection capability, and deep incision adaptation and drainage capability in the abdominal incision scenario, this invention is superior to the comparative patent. The comparative patent does not have the membrane-type clamping and sealing structure, intra-membrane flow guiding cavity connection structure, and wedge-shaped gradient flow guiding core structure corresponding to this invention. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of this invention is to provide a negative pressure drainage device for abdominal incision.

[0007] 1. A negative pressure drainage device for abdominal incision, characterized in that it comprises a gradient guide core, a flexible biomimetic sealing membrane, an interface carrier, a negative pressure connection part, and several sets of anchoring tension-reducing components; The gradient flow guide core covers the outside of the abdominal incision and is positioned across the abdominal incision; The flexible biomimetic sealing membrane covers the outside of the gradient guide core, and the edge of the flexible biomimetic sealing membrane is attached to the skin surface around the abdominal incision. The interface carrier includes an inner support plate located inside the flexible bionic sealing membrane, a membrane-penetrating section passing through the flexible bionic sealing membrane, and an outer connecting seat located outside the flexible bionic sealing membrane. The flexible bionic sealing membrane is sandwiched between the inner support plate and the outer connecting seat. The outer periphery of the membrane section is provided with an annular sealing ridge. The lower side of the inner support plate is provided with a flow guide cavity, which is connected to the upper surface of the gradient flow guide core through multiple connecting holes or flow guide windows. The negative pressure connection part is disposed on the outer connecting seat, and the negative pressure connection part is in communication with the membrane section; The several sets of anchored tension-reducing components are spaced apart along the extension direction of the abdominal incision, and each set of anchored tension-reducing components spans the abdominal incision.

[0008] Preferably, the membrane-penetrating section is a hollow tubular structure; the annular sealing ridge is continuously arranged along the circumference of the membrane-penetrating section; the annular sealing ridge is located at the part where the membrane-penetrating section passes through the flexible biomimetic sealing membrane.

[0009] The above technical solution improves the sealing stability of the membrane penetration section. The membrane penetration section employs a hollow tubular structure, forming a stable negative pressure communication channel. The annular sealing ridge is continuously arranged circumferentially along the membrane penetration section and located at the point where the membrane penetration section passes through the flexible biomimetic sealing membrane. This allows for a tighter fit between the membrane penetration section and the flexible biomimetic sealing membrane, thereby reducing the possibility of air leakage, loosening, and displacement at this location.

[0010] Specifically, the hollow tubular structure allows for a continuous passage within the membrane-penetrating section, facilitating the transmission of negative pressure from the outside to the inside. The annular sealing ridge, positioned in the critical membrane-penetrating area, creates a circumferential compression structure between the flexible biomimetic sealing membrane and the membrane-penetrating section. This structure increases the contact area and improves the fit at this location. Consequently, even when the flexible biomimetic sealing membrane is subjected to localized bending, tension, or external forces, the membrane-penetrating section maintains a good seal.

[0011] In practical applications, the combination of the hollow tubular perforated membrane section and the annular sealing ridge is more suitable for the use of abdominal incision negative pressure drainage devices. The abdominal incision area is easily affected by changes in body position, skin movement, and catheter traction during postoperative care. This structure ensures good connection stability and sealing reliability at the interface, thereby helping to maintain the continuity of the negative pressure drainage process and improving the stability of the device during clinical use.

[0012] Preferably, the plurality of connecting holes or flow guide windows are arranged circumferentially around the flow guide cavity along the inner support plate; the plurality of connecting holes or flow guide windows are opened on the lower surface of the inner support plate and communicate with the flow guide cavity.

[0013] The above technical solution can improve the uniformity of connectivity between the flow guiding area and the gradient flow guiding core. The multiple connecting holes or flow guiding windows are spaced apart circumferentially around the flow guiding cavity along the inner support disk and are located on the lower surface of the inner support disk. This allows for a multi-point connectivity structure between the flow guiding cavity and the gradient flow guiding core, thereby improving the uniformity of liquid collection and negative pressure transmission.

[0014] Specifically, with the multiple connecting holes or flow guide windows spaced circumferentially along the inner support plate, different areas above the gradient flow guide core can communicate with the flow guide cavity. This structure avoids localized suction at a single location. It also reduces the concentration of negative pressure. With the multiple connecting holes or flow guide windows located on the lower surface of the inner support plate, the liquid collected above the foam layer can enter the flow guide cavity more directly and further into the membrane penetration section, thus making the liquid flow path smoother.

[0015] In practical applications, the multiple connecting holes or drainage windows arranged around the drainage cavity are more suitable for the working requirements of abdominal incision negative pressure drainage devices. The exudate distribution in the abdominal incision area is usually relatively dispersed. This structure allows the negative pressure suction to cover a wider area, thereby helping to maintain the continuity of the drainage process and improving the overall drainage effect of the device.

[0016] Preferably, the negative pressure connection includes a connecting base and a connecting joint; the connecting base is disposed on the outer connecting seat and communicates with the membrane penetration section; the connecting joint is disposed on the connecting base.

[0017] The above technical solution can improve the connection stability between the negative pressure connection part and the interface carrier. The negative pressure connection part includes a connecting base, a connecting joint, and an external conduit. The connecting base is disposed on the outer connecting seat and communicates with the membrane penetration section. The connecting joint is disposed on the connecting base, and the external conduit is connected to the outside of the connecting joint, which can form a clearly layered external connection structure, thereby helping to improve the assembly stability of the interface.

[0018] Specifically, after the connecting base is installed on the outer connecting seat, the negative pressure connection part can first form a stable fit with the interface support, and then the connecting joint forms a connection with the external conduit. This structure allows for a relatively clear partitioned arrangement between the interface support part and the conduit connection part. This structure also allows for a stable transition between the membrane section and the external conduit through the connecting base and connecting joint, thereby helping to maintain the continuity of the negative pressure passage.

[0019] In practical applications, the mating structure of the connecting base and connector facilitates the assembly and use of the abdominal incision negative pressure drainage device. The abdominal incision site requires frequent observation and treatment during postoperative care; this structure makes the structural layers of the interface area clearer, thereby improving the ease of use of the device and enhancing the overall stability of the interface area.

[0020] Preferably, an external catheter is connected to the outside of the connector; the abdominal incision negative pressure drainage device further includes a secondary fixation patch; the secondary fixation patch is applied to the outer surface of the outer connector, the connecting base and the flexible bionic sealing membrane, and the secondary fixation patch covers the outer periphery of the external catheter near the connector.

[0021] The above technical solution can improve the fixation reliability between the external catheter and the negative pressure connection. The abdominal incision negative pressure drainage device also includes a secondary fixation patch, which is attached to the outer surface of the outer connecting seat, the connecting base, and the flexible bionic sealing membrane, and covers the outer periphery of the section of the external catheter near the connecting joint, which can further fix the interface area, thereby improving the connection stability of this part.

[0022] Specifically, after the external conduit is connected to the connector, the conduit is susceptible to pulling, bending, or displacement during use. The secondary fixing patch, covering the outer surfaces of the outer connector, connecting base, and flexible biomimetic sealing membrane, creates an integrated attachment area. Furthermore, the secondary fixing patch covers the outer periphery of the external conduit segment near the connector, providing restraint and support to the near-interface segment, thereby reducing the direct pulling effect of the conduit on the connector.

[0023] In practical applications, the combination of the external catheter and the secondary fixation patch is more suitable for the clinical use environment of abdominal incision negative pressure drainage devices. During patient turning, getting up, or moving, the catheter site is easily subjected to external forces. This structure allows the interface area to maintain a good seal and fixation, thereby facilitating continuous negative pressure drainage and improving the reliability of the device during use.

[0024] Preferably, the gradient drainage core includes a non-adhesive silicone mesh layer, a PVA polymer acetal foam layer, and a flat drainage strip; the non-adhesive silicone mesh layer is disposed on the skin-contact side; the PVA polymer acetal foam layer is disposed on the outside of the non-adhesive silicone mesh layer; the flat drainage strip passes through the PVA polymer acetal foam layer and extends from the PVA polymer acetal foam layer to the non-adhesive silicone mesh layer and passes through the non-adhesive silicone mesh layer.

[0025] The above technical solution can improve the drainage capacity of the gradient drainage core for exudate in the incision area. The gradient drainage core includes a non-adhesive silicone mesh layer, a PVA polymer acetal foam layer, and a flat drainage strip. The non-adhesive silicone mesh layer is disposed on the skin-contact side, the PVA polymer acetal foam layer is disposed outside the non-adhesive silicone mesh layer, and the flat drainage strip passes through the PVA polymer acetal foam layer, extending from the PVA polymer acetal foam layer towards and through the non-adhesive silicone mesh layer. This forms a layered drainage structure from the skin-contact side to the outside, thereby improving the overall drainage effect of the drainage core.

[0026] Specifically, when the non-adhesive silicone mesh layer is positioned on the skin-contact side, a relatively soft contact interface can be formed between the incision site and the drainage core. When the PVA polymer acetal foam layer is positioned on the outer side, a larger liquid storage and drainage space can be formed in the outer area. When the flat drainage strip passes through both the PVA polymer acetal foam layer and the non-adhesive silicone mesh layer, exudate from the deep part of the incision or a local area can be guided outward along the flat drainage strip and further distributed inside the PVA polymer acetal foam layer, thereby improving the continuity of liquid conduction.

[0027] In practical applications, the layered gradient drainage core is more suitable for the nursing requirements of abdominal incisions. The abdominal incision area often presents with both superficial and deep exudates. This structure can balance skin contact, fluid drainage, and lateral drainage distribution, thereby improving the overall drainage capacity of the abdominal incision negative pressure drainage device and enhancing its adaptability to complex incision environments.

[0028] Preferably, the cross-section of the PVA polymer acetal foam layer along the direction perpendicular to the abdominal incision is wedge-shaped; on the cross-section, the thickness of the PVA polymer acetal foam layer near the opening of the abdominal incision is greater than the thickness near the deeper part of the wound.

[0029] The above technical solution improves the fit between the PVA polymer acetal foam layer and the abdominal incision morphology. The PVA polymer acetal foam layer has a wedge-shaped cross-section perpendicular to the direction of the abdominal incision, and the thickness of the PVA polymer acetal foam layer near the incision opening is greater than the thickness near the deeper part of the wound. This allows the guide core to form a transition structure in the incision area that better conforms to the actual incision morphology, thereby improving the fit of the incision site.

[0030] Specifically, the PVA acetal foam layer, with its wedge-shaped structure, has a greater thickness near the abdominal incision opening, providing better coverage and support in that area. Conversely, the thinner thickness of the PVA acetal foam layer near the deeper wound area allows for a smoother structural transition of the drainage core into the deeper tissues. This structure reduces the abrupt transitions that conventional uniform-thickness foam blocks create in the incision area. Furthermore, this structure allows for a smoother fit between the drainage core and the surrounding tissues.

[0031] In practical applications, the wedge-shaped PVA acetal foam layer is more suitable for drainage needs of abdominal incisions. Abdominal incisions, especially deeper ones, often have irregular cross-sections with varying depths. This wedge design better adapts to the local shape of the incision, thereby reducing discomfort in the incision area and improving the stability and drainage effect of the negative pressure drainage device at the incision site.

[0032] Preferably, the abdominal incision negative pressure drainage device further includes several sets of anchoring tension-reducing components; the several sets of anchoring tension-reducing components are spaced apart on both sides of the abdominal incision along the extension direction of the abdominal incision; each set of anchoring tension-reducing components includes a first anchoring base, a second anchoring base, a first tension-reducing band, a second tension-reducing band, and a synchronous tightening locking member; the first anchoring base and the second anchoring base are respectively arranged across the abdominal incision; one end of the first tension-reducing band is connected to the first anchoring base, and the other end is connected to the synchronous tightening locking member; one end of the second tension-reducing band is connected to the second anchoring base, and the other end is connected to the synchronous tightening locking member.

[0033] The above technical solution can improve the tension-reducing stability of tissues on both sides of the abdominal incision. The abdominal incision negative pressure drainage device also includes several sets of anchored tension-reducing components, which are arranged across the abdominal incision. Each set of anchored tension-reducing components includes a first anchoring base, a second anchoring base, a first tension-reducing band, a second tension-reducing band, and a synchronous tightening locking member, which can form multiple sets of distributed tension-reducing structures on both sides of the incision, thereby helping to reduce the local tension in the incision area.

[0034] Specifically, the first and second anchoring bases are positioned across the abdominal incision, allowing the tension-reducing components to form a relatively stable fixed base on both sides of the incision. After the first and second tension-reducing bands are connected to the synchronous tightening locking components, the two sides of the incision can be tightened towards each other through the synchronous tightening locking components. With several sets of anchored tension-reducing components spaced apart along the extension direction of the abdominal incision, tension reduction can be achieved at different lengths of the abdominal incision, thereby reducing the possibility of excessive force at a single location.

[0035] In practical applications, the anchored tension-reducing component is more suitable for the nursing needs of high-tension abdominal incisions. Abdominal incisions are easily affected by coughing, turning over, and getting up and lying down during postoperative activities. This structure can create a more uniform tension-reducing effect on the tissues on both sides of the incision, thereby improving the stability of the incision area and enhancing the effectiveness of negative pressure drainage devices for abdominal incisions in high-risk incision scenarios.

[0036] Compared with the prior art, the present invention has the following advantages: 1. This invention employs a membrane-supporting structure at the interface, and sets an inner support plate, a drainage cavity, and a connecting structure inside the membrane, making the negative pressure transmission path clearer and the force relationship in the interface area more stable. Thus, after the device is attached to the abdominal incision, it can simultaneously provide connection, support, and sealing, which helps maintain the continuity of the drainage process and facilitates observation and treatment during subsequent care.

[0037] 2. The gradient flow guide core in this invention adopts a composite structure of a non-adhesive silicone mesh layer, a PVA polymer acetal foam layer, and a flat drainage strip, combined with a wedge-shaped foam layer design, enabling the flow guide core to have a better fit and transition in the incision area. This structure not only facilitates the outward conduction of exudate from the incision but also helps to reduce the abruptness of conventional uniform thickness block structures, thereby improving the adaptability of the device to abdominal incision scenarios. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the gradient flow guide core structure of the present invention; Figure 2 This is a schematic diagram of the anchored tension reduction component structure of the present invention; Figure 3 This is a schematic diagram of the membrane-penetrating segment structure of the present invention; Figure 4 This is a schematic diagram of the interface connection structure of the present invention; Figure 5 This is a schematic diagram of the negative pressure connection part of the present invention; In the diagram: 11. Non-adhesive silicone mesh layer; 12. PVA polymer acetal foam layer; 13. Flat drainage strip; 2. Flexible biomimetic sealing membrane; 31. Inner support plate; 32. Membrane penetration section; 321. Annular sealing ridge; 33. Outer connecting seat; 4. Negative pressure connection part; 41. Connecting base; 42. Connecting joint; 5. Anchored tension reduction component; 51. First anchoring base; 52. Second anchoring base; 53. First tension reduction belt; 54. Second tension reduction belt; 55. Synchronous tightening locking component. Detailed Implementation

[0039] Working principle The abdominal incision negative pressure drainage device of the present invention mainly consists of a gradient guide core, a flexible bionic sealing membrane 2, an interface carrier, a negative pressure connection part 4, and several sets of anchored tension-reducing components 5. The gradient guide core covers the outside of the abdominal incision and is positioned across the abdominal incision. The flexible bionic sealing membrane 2 covers the outside of the gradient guide core, and its edges are attached to the skin surface around the incision. In this way, a relatively closed negative pressure space is formed outside the incision area.

[0040] An interface support is mounted on the flexible bionic sealing membrane 2. The interface support includes an inner support plate 31, a membrane-penetrating section 32, and an outer connecting seat 33. The flexible bionic sealing membrane 2 is sandwiched between the inner support plate 31 and the outer connecting seat 33. The membrane-penetrating section 32 passes through the flexible bionic sealing membrane 2. An annular sealing ridge 321 is provided on the outer periphery of the membrane-penetrating section 32. This structure enables a relatively stable fit at the membrane-penetrating part. A negative pressure connection part 4 is mounted on the outer connecting seat 33 and communicates with the membrane-penetrating section 32. Thus, external negative pressure can be transmitted to the inner region of the membrane body via the negative pressure connection part 4 and the membrane-penetrating section 32.

[0041] A flow guiding cavity is provided on the lower side of the inner support plate 31. Multiple connecting holes or flow guiding windows are formed on the lower surface of the inner support plate 31. These connecting holes or flow guiding windows are spaced apart circumferentially around the flow guiding cavity along the inner support plate 31 and communicate with it. Liquid in the incision area first gathers upwards through the gradient flow guiding core, then enters the flow guiding cavity through the multiple connecting holes or flow guiding windows, subsequently enters the membrane perforation section 32, and is further discharged through the negative pressure connection part 4. In this way, the device can form a continuous drainage path from the incision area to the external conduit.

[0042] The gradient drainage core includes a non-adhesive silicone mesh layer 11, a PVA polymer acetal foam layer 12, and a flat drainage strip 13. The non-adhesive silicone mesh layer 11 is disposed on the skin-contact side. The PVA polymer acetal foam layer 12 is disposed on the outside of the non-adhesive silicone mesh layer 11. The flat drainage strip 13 passes through the PVA polymer acetal foam layer 12 and extends from the PVA polymer acetal foam layer 12 to the non-adhesive silicone mesh layer 11, passing through the non-adhesive silicone mesh layer 11. In this way, exudate from the cut area, especially the deeper parts, can first be guided out through the flat drainage strip 13, then diffuse towards the PVA polymer acetal foam layer 12, and collect in the area below the interface carrier.

[0043] The PVA acetal foam layer 12 has a wedge-shaped cross-section perpendicular to the direction of the abdominal incision. In this cross-section, the thickness of the PVA acetal foam layer 12 near the opening of the abdominal incision is greater than the thickness near the deeper part of the wound. This structure allows the gradient flow core to form a gentler thickness transition in the incision area. This makes it easier for the flow core to conform to the actual shape of the abdominal incision.

[0044] Several sets of anchored tension-reducing components 5 are spaced apart along the direction of the abdominal incision, and each set of anchored tension-reducing components 5 spans the abdominal incision. Each set of anchored tension-reducing components 5 includes a first anchoring base 51, a second anchoring base 52, a first tension-reducing band 53, a second tension-reducing band 54, and a synchronous tightening locking member 55. The first anchoring base 51 and the second anchoring base 52 are respectively attached to the skin surface on both sides of the abdominal incision. The first tension-reducing band 53 and the second tension-reducing band 54 are respectively connected to the corresponding anchoring base and the synchronous tightening locking member 55. This structure can form a cross-incision tension-reducing effect on both sides of the incision. In this way, the incision area can also obtain tension-reducing support during negative pressure drainage.

[0045] Example 1 like Figures 1-5 As shown, this embodiment provides a negative pressure drainage device for abdominal incisions. The device includes a gradient guide core, a flexible biomimetic sealing membrane 2, an interface carrier, a negative pressure connection part 4, and several sets of anchored tension-reducing components 5.

[0046] In this embodiment, the gradient drainage core covers the outside of the abdominal incision and extends across it. A flexible biomimetic sealing membrane 2 covers the outside of the gradient drainage core. The edge of the flexible biomimetic sealing membrane 2 is attached to the skin surface around the abdominal incision. In this way, the gradient drainage core can be positioned above the abdominal incision area, and the flexible biomimetic sealing membrane 2 can form a closed covering structure outside the gradient drainage core, thus providing a basis for subsequent negative pressure drainage.

[0047] In this embodiment, the interface support is disposed on the flexible bionic sealing membrane 2. The interface support includes an inner support plate 31 located inside the flexible bionic sealing membrane 2, a membrane-penetrating section 32 passing through the flexible bionic sealing membrane 2, and an outer connecting seat 33 located outside the flexible bionic sealing membrane 2. The flexible bionic sealing membrane 2 is sandwiched between the inner support plate 31 and the outer connecting seat 33. An annular sealing ridge 321 is provided on the outer periphery of the membrane-penetrating section 32. The annular sealing ridge 321 is located at the part where the membrane-penetrating section 32 passes through the flexible bionic sealing membrane 2. This structure enables a relatively stable fit between the membrane-penetrating section 32 and the flexible bionic sealing membrane 2, and provides good support and sealing performance in the interface area.

[0048] In this embodiment, the membrane-penetrating section 32 is a hollow tubular structure. This hollow tubular structure can form a negative pressure communication channel inside the interface carrier. Negative pressure can be transmitted from the outside to the inside of the flexible bionic sealing membrane 2 through this channel. The annular sealing ridge 321 is continuously arranged along the circumference of the membrane-penetrating section 32. This structure can form a circumferential pressing area between the membrane-penetrating section 32 and the flexible bionic sealing membrane 2, thereby reducing the possibility of air leakage and loosening at the membrane-penetrating part.

[0049] In this embodiment, a flow guiding cavity is provided on the lower side of the inner support disk 31. Multiple connecting holes or flow guiding windows are formed on the lower surface of the inner support disk 31. These connecting holes or flow guiding windows are spaced apart circumferentially around the flow guiding cavity and communicate with it. In this way, the liquid collected above the gradient flow guiding core can first enter the multiple connecting holes or flow guiding windows, then enter the flow guiding cavity, and subsequently enter the membrane penetration section 32. This structure enables the negative pressure to form a relatively uniform transmission path in the area below the interface carrier, and also allows the exudate to form a smoother collection path in the interface area.

[0050] In this embodiment, the negative pressure connection part 4 is disposed on the outer connecting seat 33. The negative pressure connection part 4 includes a connecting base 41, a connecting connector 42, and an external conduit. The connecting base 41 is disposed on the outer connecting seat 33 and communicates with the membrane penetration section 32. The connecting connector 42 is disposed on the connecting base 41. The external conduit is connected to the outside of the connecting connector 42. This structure enables a continuous communication relationship between the membrane penetration section 32, the connecting base 41, the connecting connector 42, and the external conduit, thereby facilitating the connection between the external negative pressure source and the main body of the device.

[0051] In this embodiment, the abdominal incision negative pressure drainage device also includes a secondary fixation patch. The secondary fixation patch is applied to the outer surface of the outer connecting seat 33, the connecting base 41, and the flexible biomimetic sealing membrane 2, and covers the outer periphery of the external catheter segment near the connecting joint 42. This structure can further fix the interface area and the catheter segment near the interface, thereby reducing the adverse effects of catheter traction on the interface site.

[0052] In this embodiment, the gradient drainage core includes a non-adhesive silicone mesh layer 11, a PVA polymer acetal foam layer 12, and a flat drainage strip 13. The non-adhesive silicone mesh layer 11 is disposed on the skin-contact side. The PVA polymer acetal foam layer 12 is disposed on the outside of the non-adhesive silicone mesh layer 11. The flat drainage strip 13 passes through the PVA polymer acetal foam layer 12 and extends from the PVA polymer acetal foam layer 12 to the non-adhesive silicone mesh layer 11, passing through the non-adhesive silicone mesh layer 11. The non-adhesive silicone mesh layer 11 can form a relatively gentle contact with the cut area. The PVA polymer acetal foam layer 12 can form an outer drainage and liquid storage area. The flat drainage strip 13 can draw liquid from deeper parts of the cut outwards and allow the liquid to further diffuse into the PVA polymer acetal foam layer 12.

[0053] In this embodiment, the PVA acetal foam layer 12 has a wedge-shaped cross-section along the direction perpendicular to the abdominal incision. On this cross-section, the thickness of the PVA acetal foam layer 12 near the abdominal incision opening is greater than the thickness near the deeper part of the wound. This structure allows the gradient flow core to form a smoother thickness transition in the abdominal incision area and makes it easier for the gradient flow core to conform to the actual shape of the abdominal incision. Thus, the gradient flow core is less likely to form an abrupt, uniform thickness buildup when covering the abdominal incision.

[0054] In this embodiment, several sets of anchored tension-reducing components 5 are spaced apart along the extension direction of the abdominal incision, and each set of anchored tension-reducing components 5 spans the abdominal incision. Each set of anchored tension-reducing components 5 includes a first anchoring base 51, a second anchoring base 52, a first tension-reducing band 53, a second tension-reducing band 54, and a synchronous tightening locking member 55. The first anchoring base 51 and the second anchoring base 52 are respectively attached to the skin surface on both sides of the abdominal incision. One end of the first tension-reducing band 53 is connected to the first anchoring base 51, and the other end is connected to the synchronous tightening locking member 55. One end of the second tension-reducing band 54 is connected to the second anchoring base 52, and the other end is connected to the synchronous tightening locking member 55. The first tension-reducing band 53 and the second tension-reducing band 54 span the abdominal incision. This structure can form a cross-incision tension-reducing effect on both sides of the abdominal incision, thereby providing relatively stable tension-reducing support for the tissues around the abdominal incision.

[0055] In this embodiment, the gradient drainage core is first placed over the outside of the abdominal incision, spanning the incision. Then, a flexible biomimetic sealing membrane 2 is placed over the gradient drainage core, with its edges affixed to the skin surface around the abdominal incision. Next, the negative pressure connection 4 is connected to an external negative pressure source. External negative pressure is transmitted through the connection joint 42, connection base 41, and membrane-penetrating section 32 to the area below the inner support plate 31. Exudate from the abdominal incision area is first drained through the flat drainage strip 13, then enters the PVA polymer acetal foam layer 12, and then enters the drainage cavity through multiple connecting holes or drainage windows on the lower surface of the inner support plate 31, subsequently draining through the membrane-penetrating section 32 and the negative pressure connection 4. Afterwards, several sets of anchored tension-reducing components 5 are used to reduce tension and fix the tissues on both sides of the abdominal incision across the incision. Thus, the device can provide tension-reducing support to the tissues around the abdominal incision during negative pressure drainage.

[0056] In this embodiment, the gradient guide core, flexible biomimetic sealing membrane 2, interface carrier, negative pressure connection part 4, and anchoring tension-reducing component 5 together constitute the overall structure of the abdominal incision negative pressure drainage device. This overall structure can simultaneously achieve coverage, drainage, interface connection, and tension reduction and fixation of the abdominal incision area, making it more suitable for postoperative care of abdominal incisions.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A negative pressure drainage device for abdominal incision, characterized in that, It includes a gradient guide core, a flexible biomimetic sealing membrane (2), an interface carrier, a negative pressure connection part (4), and several sets of anchored tension reduction components (5); The gradient flow guide core covers the outside of the abdominal incision and is positioned across the abdominal incision; The flexible bionic sealing membrane (2) covers the outside of the gradient guide core, and the edge of the flexible bionic sealing membrane (2) is attached to the skin surface around the abdominal incision. The interface carrier includes an inner support plate (31) located inside the flexible bionic sealing membrane (2), a membrane-penetrating section (32) passing through the flexible bionic sealing membrane (2), and an outer connecting seat (33) located outside the flexible bionic sealing membrane (2). The flexible bionic sealing membrane (2) is sandwiched between the inner support plate (31) and the outer connecting seat (33). The outer periphery of the membrane section (32) is provided with an annular sealing ridge (321); The lower side of the inner support plate (31) is provided with a flow guide cavity, which is connected to the upper surface of the gradient flow guide core through multiple connecting holes or flow guide windows. The negative pressure connection part (4) is disposed on the outer connecting seat (33), and the negative pressure connection part (4) is in communication with the membrane section (32); The several sets of anchoring tension-reducing components (5) are spaced apart along the direction of the abdominal incision, and each set of anchoring tension-reducing components (5) spans the abdominal incision.

2. The abdominal incision negative pressure drainage device according to claim 1, characterized in that: The membrane segment (32) is a hollow tubular structure; The annular sealing ridge (321) is continuously arranged along the circumference of the membrane section (32); The annular sealing ridge (321) is located at the part where the membrane-penetrating section (32) passes through the flexible biomimetic sealing membrane (2).

3. The abdominal incision negative pressure drainage device according to claim 1, characterized in that: The plurality of connecting holes or flow guide windows are arranged circumferentially around the flow guide cavity along the inner support disk (31). The plurality of connecting holes or flow guide windows are opened on the lower surface of the inner support plate (31) and communicate with the flow guide cavity.

4. The abdominal incision negative pressure drainage device according to claim 1, characterized in that: The negative pressure connection part (4) includes a connection base (41), a connection connector (42), and an external conduit; The connecting base (41) is disposed on the outer connecting base (33), and the connecting base (41) is in communication with the membrane section (32); The connecting joint (42) is disposed on the connecting base (41); The external conduit is connected to the outside of the connector (42).

5. The abdominal incision negative pressure drainage device according to claim 4, characterized in that: The abdominal incision negative pressure drainage device also includes a secondary fixation patch; The secondary fixing patch is applied to the outer surface of the outer connecting seat (33), the connecting base (41) and the flexible bionic sealing membrane (2), and the secondary fixing patch covers the outer periphery of the external conduit near the connecting joint (42).

6. The abdominal incision negative pressure drainage device according to claim 1, characterized in that: The gradient guide core includes a non-adhesive silicone mesh layer (11), a PVA polymer acetal foam layer (12), and a flat guide strip (13); The non-adhesive silicone mesh layer (11) is disposed on the skin-contact side; The PVA polymer acetal foam layer (12) is disposed on the outside of the non-adhesive silicone mesh layer (11); The flat drainage strip (13) passes through the PVA polymer acetal foam layer (12) and extends from the PVA polymer acetal foam layer (12) to the non-adhesive silicone mesh layer (11) and passes through the non-adhesive silicone mesh layer (11).

7. The abdominal incision negative pressure drainage device according to claim 6, characterized in that: The PVA polymer acetal foam layer (12) has a wedge-shaped cross section along the direction perpendicular to the abdominal incision. On the cross section, the thickness of the PVA polymer acetal foam layer (12) near the abdominal incision opening is greater than the thickness near the deep part of the wound.

8. The abdominal incision negative pressure drainage device according to claim 1, characterized in that: Each of the anchored tension-reducing components (5) includes a first anchoring base (51), a second anchoring base (52), a first tension-reducing belt (53), a second tension-reducing belt (54), and a synchronous tightening locking member (55); The first anchoring base (51) and the second anchoring base (52) are respectively attached to the skin surface on both sides of the abdominal incision; One end of the first tension-reducing belt (53) is connected to the first anchoring base (51), and the other end is connected to the synchronous tightening locking member (55); One end of the second tension-reducing belt (54) is connected to the second anchoring base (52), and the other end is connected to the synchronous tightening locking member (55); The first tension-reducing band (53) and the second tension-reducing band (54) are positioned across the abdominal incision.

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