Drainage structure for continuous and uniform negative pressure conduction of whole wound surface
The full-wound negative pressure conduction and drainage structure, designed with a single-layer structure and separators, solves the problems of easy water loss of porous foam materials and easy detachment of PVA materials, achieving uniform negative pressure conduction and efficient drainage on uneven wound surfaces, thus improving treatment effectiveness and efficiency.
Patent Information
- Application Number
- CN202422484815.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-12
- Filing Date
- 2024-10-14
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-10-14
AI Technical Summary
In existing VSD technology, porous foam materials are prone to water loss, drying and hardening, reducing drainage cavities and permeability. Furthermore, they are prone to causing endothelial cell damage and loosening of the drainage system on uneven wound surfaces. PVA materials are also prone to falling off, resulting in poor negative pressure drainage effects.
The single-layer structure provides continuous and uniform negative pressure conduction and drainage throughout the entire wound surface. It forms a cavity with through holes by combining a separator with a porous foam layer. The gradually expanding surface design of the separator reduces pressure and avoids multi-layer deformation and displacement. Combined with PVA material, it provides moisture retention.
It achieves uniform negative pressure conduction on uneven wound surfaces, reduces pressure on capillaries, prevents blockage, improves drainage efficiency, extends material usage time, reduces medical costs, and reduces patient suffering.
Smart Images
Figure CN223746746U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of negative pressure closed drainage, specifically points to a kind of drainage structure of full wound surface sustained even negative pressure conduction. BACKGROUND
[0002] The basic configuration of the existing VSD technology includes medical hydrophilic foam material or medical hydrophobic foam material (hereinafter referred to as porous foam material), sealing film, drainage pipeline, collection container and negative pressure source (including medical suction machine, hospital central negative pressure device or negative pressure drainage bottle, etc.). By applying continuous or intermittent negative pressure suction to the wound cavity, the exudate, necrotic tissue, toxins and pus in the wound cavity can be drained into the collection container, and then the exudate, necrotic tissue, toxins and pus can be directly discharged outside the body, avoiding the reabsorption of harmful substances by liver and kidney, reducing the number of bacteria on the wound, reducing edema, preventing the occurrence of multiple organ failure (MOF) and respiratory distress syndrome (ARDS); At the same time, negative pressure suction can increase blood flow in the wound, stimulate cell secretion of growth factors, thereby effectively promoting the growth of new blood vessels and granulation, promoting tissue repair and shortening the healing time of wound cavity. Using this technology, cross infection is effectively avoided, the workload of medical staff is reduced, the cure rate of wound cavity of patients is improved, and the mortality and disability rate of trauma is reduced.
[0003] The VSD technology currently mainly consists of "sealing wound" + "applying negative pressure" + "connecting drainage", which is a complete treatment system that achieves coordinated symbiosis. The process of coordinated symbiosis and mutual help is achieved as follows:
[0004] Sealing wound is completed by foam material, and sealing wound is the most basic and necessary medical process in clinical surgery to change open wound into closed wound. At the same time, after the wound is sealed, the planar infected wound is artificially changed into a cavity capsule, and the cavity capsule provides a working space for the next step of negative pressure.
[0005] The negative pressure (Vacuum) is achieved by connecting the drainage tube, negative pressure source; the negative pressure at this time refers to the negative pressure source work so that the pressure in the cavity space on the wound and the blood pressure in the capillary of the wound tissue compared to the relative; the pressure in the wound cavity is much smaller than the pressure in the blood vessels, so it is called negative pressure; because the pressure in the capillary is much greater than the pressure outside the capillary, the negative pressure on the wound will directly affect the expansion and protrusion of the capillary wall; and the expansion and protrusion of the capillary wall will cause the space volume of the capillary lumen to increase; the increase of space and volume has two effects: 1. The increase of blood flow and blood flow velocity by 5-12 times or more brings a large amount of tissue mother cells, red blood cells rich in oxygen and platelet groups (PRP) rich in repair growth factors and various tissue protein amino acid components necessary for wound repair; 2. The continuous increase of the space and volume of the local wound will cause the network of capillaries to expand, twist and form a group on the blood vessel wall, thus forming a fresh and neat granular granulation tissue bed like a ruby.
[0006] The connection of the drainage (Drainage) is to connect the negative pressure source and the cavity on the wound by the drainage tube; the connection of the drainage: 1. Provides a negative pressure source for the cavity on the wound, so that the blood pressure in the capillary of the wound tissue is much higher than the pressure in the cavity, so that the blood flow and blood flow velocity in the capillary are increased by 5-12 times compared with other tissues outside the wound; 2. The contaminants, necrotic tissue and necrotic tissue debris, pus, tissue exudate and other contaminants on the wound are continuously and quickly cleaned.
[0007] Therefore, negative pressure (Vacuum), sealing (Sealing) and drainage (Drainage) form a complementary and efficient treatment system, and negative pressure (Vacuum), sealing (Sealing) and drainage (Drainage) are VSD.
[0008] However, there are still some defects in the clinical application, at least the following problems exist:
[0009] (1) The porous foam material is easy to dry and harden after 2-4 days of clinical application, resulting in a decrease in material resilience, a significant reduction in effective drainage gap, a decrease in permeability, and a gradual blockage. Under the action of organic colloid such as pus, tissue fluid, exudate and blood, the foam material pores often stick together, the foam elasticity decreases, and the foam material actually cannot rebound on the whole wound surface;
[0010] (2) When a double-layer drainage device is applied to an uneven wound surface, under negative pressure and in a bent state, the curvature of the upper and lower layers is different, which will generate shear force on the endothelial cells on the uneven wound surface, thereby damaging and puncturing the granulation tissue of the endothelial cells, causing the wound tissue bed to lose its repair vitality.
[0011] (3) The curvature of the bottom of the double-layer drainage device where it is attached to the PVA is different, which causes the PVA to fall off and the upper and lower layers to shift, making the overall negative pressure drainage system on the wound loose and even leaking and collapsing. Utility Model Content
[0012] To address the shortcomings of existing technologies, this invention proposes a drainage structure for continuous and uniform negative pressure conduction across the entire wound surface. It employs a single-layer structure, enhancing the negative pressure conduction effect and increasing wound drainage volume; significantly reducing the resistance to negative pressure conduction; and greatly and uniformly distributing the negative pressure effect across the entire wound surface. Meanwhile, the hydrophilic PVA material provides continuous wound moisturizing within its flexible, expandable space. The simple, single-layer support and drainage structure also avoids the deformation and displacement associated with other multi-layer designs.
[0013] To achieve the above objectives, this utility model designs a structure for continuous and uniform negative pressure conduction and drainage across the entire wound surface, which is used in conjunction with a porous foam layer for negative pressure drainage operations. Its special feature is that it includes a structural body; a separator is provided on the side of the structural body opposite to the porous foam layer, the separator forming a cavity between the structural body and the porous foam layer; a through hole is provided at the position of the structural body opposite to the cavity, the through hole connecting the upper space and the lower space of the structural body.
[0014] Furthermore, one end of the separator is fixed to the structural body, and the other end is the top. The volume of the separator gradually decreases from the fixed end to the top, thus forming a gradually expanding surface along the surface of the separator from the fixed end to the top. Under negative pressure, the expanding surface gradually increases the contact area between the porous foam layer and the separator, thereby gradually reducing the pressure on the separator. Consequently, the pressure exerted by the separator on the wound surface gradually and uniformly decreases, reducing the pressure on the granulation tissue surface to the lowest physiological level.
[0015] Furthermore, the fixed end is circular or a regular polygon, and the top end is a vertex or end face. The circular or regular polygonal fixed end is connected to the bottom surface of the structural body, and the top end is connected to the porous foam layer.
[0016] Further, the ratio of the distance d2 between adjacent partitions on the structure body to the width d1 of the bottom surface of the partition is 0.2-3. If the distance between adjacent partitions is too large, the partition cannot generate a rebounding force, and the porous foam layer and the structure body can be adhered due to residual gelatinous substances in the drainage liquid, and thus cannot be separated. If the distance is too small, various colloidal drainage substances can easily accumulate, and the drainage material cannot be discharged to the wound surface in time.
[0017] Further, the partition is a rotary body, and the generatrix of the rotary body is a straight generatrix or a curved generatrix. The distribution of the rotary body in this way makes the outer surface of the partition smooth and the force uniform.
[0018] Further, the axial section of the partition is one of a triangle, a trapezoid, a circle, a semicircle, an ellipse, a rectangle, a parallelogram, or a combination of two.
[0019] Further, the partition is a columnar structure, and a plurality of flange structures extend outward in the axial direction.
[0020] Further, the front end of the flange structure is an arc surface or a conical surface.
[0021] Further, the outer surface of the partition is provided with uniformly or non-uniformly distributed protrusions for better combination with PVA raw materials in the flocking process.
[0022] Further, the surface of the structure body close to the wound surface is connected to the porous foam layer, and the surface of the structure body away from the wound surface is connected to one or more suction cups.
[0023] Further, the porous foam layer is made of one or more of polyvinyl alcohol resin PVA, modified polyvinyl alcohol resin PVA, polyurethane elastomer PU, or modified polyurethane elastomer PU.
[0024] Further, the surface of the structure body away from the wound surface is provided with a sealing film, the sealing film is provided with a drainage hole, the skirt of the suction cup is attached to the semi-permeable membrane, and the central cavity of the suction cup is opposite to the drainage hole.
[0025] Further, the surface of the structure body away from the wound surface is a rough plane for damping the sealing film to prevent displacement.
[0026] Further, the structure body and the porous foam layer are fixedly connected by sewing or gluing, and the structure body and the porous foam layer can be cut and spliced according to the size of the wound surface.
[0027] Further, the fixing points between the structure body and the porous foam layer are uniformly distributed to ensure effective fixation in the cutting area when cutting.
[0028] Further, the structure body is flocked on the surface of the porous foam layer after being heated by a coating process.
[0029] Further, the partition bodies are evenly arranged on the surface of the structure body close to the wound surface.
[0030] Further, the bottom surface of the partition body is not greater than 10 mm in diameter and not greater than 6 mm in height.
[0031] Further, the porosity of the structure body is 15% to 70%.
[0032] Further, the structure body and the partition body are made of a thermosetting elastomer, rubber or thermoplastic elastomer material.
[0033] Further, the structure body is formed by a complex molding process, an injection molding process or a molding process.
[0034] Further, the hardness of the structure body ranges from 5 to 35 degrees, and the hardness of the partition body ranges from 5 to 40 degrees. The hardness of the partition body can be slightly greater than that of the structure body, so as to give the structure body appropriate resilience.
[0035] The structure for continuously and uniformly conducting and draining negative pressure on the whole wound surface is used in combination with the porous foam layer in negative pressure drainage treatment. The partition body arranged on the lower surface of the structure body forms a cavity between the structure body and the porous foam layer below, so that an effective conducting channel is formed on the surface of the porous foam layer, and the pressure between the porous foam layer and the wound surface is reduced, and the compression on the capillary endothelial cells on the granulation tissue bed is greatly reduced. After the drainage is completed, the partition body helps the structure body to rebound upward, so that the volume of the cavity is gradually restored, and the relative stable space of the structure body and the porous foam layer is maintained, and the effective drainage gap is restored.
[0036] Compared with the prior art, the utility model has the following beneficial technical effects:
[0037] 1. The design of the partition body does not cause the pillar body to be tilted, skewed and dislocated during negative pressure suction, and meets the use requirements in specific forms such as twisting, steps, spirals and even reverse folding on any wound surface topography.
[0038] 2. In actual use, the interval change between the maximum value and the minimum value of the negative pressure required for clinical wound treatment is relatively large, the gradual and mild deformation of the arc surface curvature of the partition body provides a space that can adapt to the dramatic change of pressure for the wound negative pressure drainage treatment, and the space can also ensure continuous and effective drainage and continuous rebound.
[0039] 3. The spacing of the partition body is designed within a reasonable range, preventing the spacing from being too large to cause the porous foam layer and the structure body to be adhered by the gel-like substance and unable to be separated, and the spacing from being too small to easily cause the accumulation of various gel-like drainage substances, so that the drainage cannot be discharged to the wound surface in time;
[0040] 4. In the negative pressure drainage operation, the pressure on the wound surface is continuously increased, and when the partition body contacts the wound surface, the contact area is gradually increased as the pressure continuously increases, so that the pressure on the wound surface is obviously reduced relative to the straight column support, and the possibility of blood flow blockage in the wound tissue and pressure necrosis of the tissue cells is greatly reduced;
[0041] 5. The drainage structure designed in the utility model is applied to uneven wound surfaces and cavity gaps in clinical applications, and under the condition of negative pressure, upper and lower layer displacement and shearing are not generated;
[0042] 6. When used in combination with the PVA porous foam material, a path without hardening and collapse is provided, and there is a certain moisturizing effect, thereby solving the problems of gradual hardening of the PVA porous foam material due to water loss, gradual decrease of the foam material resilience and permeability, and gradual blockage of the drainage channel;
[0043] 7. The number of replacement of the wound cavity material in clinical applications is reduced, the possibility of air pollution of the wound surface is reduced, the time of continuous use of the negative pressure drainage material in the wound cavity is prolonged, the workload of medical staff is reduced, the pain of the patient during drug replacement is reduced, the medical cost is greatly reduced, and the diagnosis and treatment efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS
[0044] Figure 1 It is a front view structural schematic diagram of the embodiment 1 of the utility model;
[0045] Figure 2 It is a bottom view structural schematic diagram of the embodiment 1 of the utility model;
[0046] Figure 3 It is a top view structural schematic diagram of the embodiment 1 of the utility model;
[0047] Figure 4 It is a front view structural schematic diagram of a single partition body with a trapezoidal axial section in the embodiment 2 of the utility model;
[0048] Figure 5 It is a three-dimensional structural schematic diagram of a single partition body with a triangular axial section in the embodiment 2 of the utility model;
[0049] Figure 6 It is a front view structural schematic diagram of a single partition body with a circular truncated cone axial section in the embodiment 2 of the utility model;
[0050] Figure 7 It is the three-dimensional structure schematic view of the single partition body with the axial section of the circular truncated cone shape in the embodiment 2 of the utility model.
[0051] Figure 8 It is the front view structure schematic view of the single partition body with the axial section of the ellipse shape in the embodiment 2 of the utility model.
[0052] Figure 9 It is the three-dimensional structure schematic view of the single partition body with the axial section of the ellipse shape in the embodiment 2 of the utility model.
[0053] Figure 10 It is the front view structure schematic view of the single partition body with the outer flange structure in the embodiment 3 of the utility model.
[0054] Figure 11 It is the three-dimensional structure schematic view of the single partition body with the outer flange structure in the embodiment 3 of the utility model.
[0055] Figure 12 It is the front view structure schematic view of the drainage structure of the utility model for continuously and uniformly conducting negative pressure on the whole wound surface in the embodiment 4.
[0056] Figure 13 It is the front view structure schematic view of the drainage structure of the utility model for continuously and uniformly conducting negative pressure on the whole wound surface in the embodiment 5.
[0057] Figure 14 It is the front view structure schematic view of the drainage structure of the utility model for continuously and uniformly conducting negative pressure on the whole wound surface in the embodiment 6.
[0058] Figure 15 It is the three-dimensional structure schematic view of the drainage structure of the utility model for continuously and uniformly conducting negative pressure on the whole wound surface in the embodiment 6.
[0059] Figure 16 It is the front view structure schematic view of the drainage structure of the utility model for continuously and uniformly conducting negative pressure on the whole wound surface in the embodiment 7.
[0060] In the drawing: structure body 1, porous foam layer 2, partition body 3, fixed end 3-1, top end 3-2, cavity 4, through hole 5, sealing film 6, suction disc 7, drainage hole 8. DETAILED DESCRIPTION
[0061] The utility model will be further described in detail in combination with the drawings and specific embodiments.
[0062] Embodiment 1
[0063] As Figures 1-3As shown, the drainage structure for continuously conducting uniform negative pressure on a whole wound surface provided in the embodiment comprises a structure body 1, the lower surface of the structure body 1 is provided with uniformly distributed partition bodies 3, the partition bodies 3 form cavities 4 between the structure body 1 and the porous foam layer 2 below; the structure body 1 is provided with through holes 5 at the positions opposite to the cavities 4, the through holes 5 make the upper space and the lower space of the structure body 1 communicate.
[0064] The structure body 1 and the porous foam layer 2 are both flexible structures. The structure body 1 can be a sheet layer structure, or a substantially sheet layer structure, and the structure body 1 has irregular bodies such as recesses, protrusions, twists and folds on the basis of the sheet layer structure.
[0065] When the negative pressure drainage is performed by using the utility model, first, the medical sealing film is sealed to complete the sealing of the wound surface (Sealing), and the planar infected wound surface is artificially changed into a cavity capsule. The cavity capsule provides a space for the negative pressure to work. Then, the external negative pressure device gives the cavity capsule negative pressure (Vacuum). Under the strong negative pressure in the cavity capsule, the pressure in the capillary blood vessels is actually much greater than the pressure outside the capillary blood vessels, and thus the negative pressure on the wound surface will directly affect the expansion and protrusion of the capillary blood vessel wall. Under the negative pressure, the structure body 1 is extruded and deformed towards the negative pressure source, the lower porous foam layer 2 applies upward extrusion force to the partition body 3, the pressure of the porous foam layer 2 and the contact surface is reduced, the compression of the capillary endothelial cells on the granulation tissue bed is greatly reduced, and the partition body 3 is simultaneously stressed from the bottom surface and the side surface to prevent the partition body 3 from being twisted and deformed. Next, the drainage pipe is connected to the negative pressure source and the cavity capsule on the wound surface to connect the drainage (Drainage). The drainage liquid is conducted from the porous foam layer 2 to the cavity 4 and drained out through the through hole 5. As the negative pressure increases, the volume of the cavity 4 is continuously compressed, the contact area of the porous foam layer 2 and the partition body 3 gradually increases, the pressure on the partition body 3 is reduced, and thus the compression force on the wound is reduced. After the drainage is completed, the pressure in the cavity capsule of the wound surface decreases, the porous foam layer 2 is no longer subjected to the negative pressure, starts to rebound, gradually moves away from the lower surface of the partition body 3, and thus the volume of the cavity 4 is gradually restored, the partition body 3 maintains the relative space between the structure body 1 and the porous foam layer 2, and thus the effective drainage gap is restored.
[0066] Embodiment 2
[0067] The shape, structure and arrangement mode of the partition body 3 have various design forms, and can be adaptively adjusted according to actual requirements.
[0068] As an embodiment of the utility model, the partition body 3 is a revolution body, and the generatrix of the revolution body is a straight generatrix. The axial section of the partition body 3 is one of a triangle, a trapezoid, a circle, a semicircle, a circular truncated cone, an ellipse, a rectangle and a parallelogram, or a combination of two. The structure of the axial section of the partition body 3 being a trapezoid is as shown inFigure 4 As shown in the figure, the axial section is triangular structure such as Figure 5 As shown in the figure, the axial section is circular truncated cone structure such as Figure 6 、 7 As shown in the figure, the axial section is elliptical structure such as Figure 8 、 9 As shown in the figure.
[0069] One end of the partition body 3 is a fixed end 3-1 fixed at the bottom of the structure body 1, and the other end is a top end 3-2; the volume of the partition body 3 is tapered from the fixed end 3-1 to the top end 3-2, so that the cavity 4 is formed from the fixed end 3-1 to the top end 3-2 along the surface of the partition body 3.
[0070] The structure body 1 and the partition body 3 are made of thermosetting elastomer, rubber or thermoplastic elastomer material. The structure can be formed by a complex mold process, injection molding process or molding process. The effective porosity of the structure body 1 is preferably 15% to 70%; the bottom surface diameter of the partition body 3 is not greater than 10mm, and the height is not greater than 6mm. The hardness range of the structure body 1 is 5 to 35 degrees, and the hardness range of the partition body 3 is 5 to 40 degrees.
[0071] In use, the structure body 1 is placed on the porous foam layer 2, or the two are fixedly connected by sewing or gluing. The structure body 1 is a sheet structure, which can be cut and spliced according to the shape and size of the wound or wound cavity. The fixing points between the structure body 1 and the porous foam layer 2 are uniformly distributed to ensure effective fixation in the cutting area when cutting. The top end 3-2 of the partition body 3 contacts the porous foam layer 2, so that the downward convex arc surface of the lower surface of the partition body 3 forms an upward tapered cavity 4 on the upper surface of the porous foam layer 2.
[0072] Under the action of negative pressure, the drainage liquid is conducted from the porous foam layer 2 to the cavity 4 and drained out through the through hole 5. Due to the area of the top end 3-2 of the partition body 3 being smaller than the bottom surface area of the fixed end 3-1, under the action of high negative pressure, the lower porous foam layer 2 will contact the side surface of the partition body 3 after being extruded and deformed. The circular arc side surface increases the contact area between the porous foam layer 2 and the partition body 3, so that the pressure received by the partition body 3 is reduced, thereby reducing the pressure on the wound surface.
[0073] Example 3
[0074] The difference between this embodiment and example 1 is that the partition body 3 is a columnar structure of a rotary body, and the generatrix of the rotary body is a curved generatrix. As shown in the figure, the partition body 3 extends outward along the axial direction to form a plurality of flange structures. Figure 10 、 11 The front end of the flange structure is an arc surface or a conical surface.
[0075] When the partition body 3 in the embodiment is used, the flange structure increases the outer surface area of the partition body 3, and in the negative pressure drainage operation, the pressure intensity on the partition body 3 is further reduced due to the larger outer surface area, so that the compression force of the drainage structure on the wound surface is small, and the pain of the patient is reduced.
[0076] Further, the partition body 3 with the flange structure in the tooth-shaped arrangement preferably maintains the cavity 4 between the structural body 1 and the porous foam layer 2, so that the structural body 1 and the porous foam layer 2 rebound immediately after the negative pressure drainage is completed, and the partition body 3 of the elastic material can provide a higher elastic coefficient, continuously provide rebound force like a spring structure during rebounding, and maintain the effect of negative pressure conduction.
[0077] Embodiment 4
[0078] The difference between the embodiment and the embodiment 1 is that, as shown in the figure, the ratio of the interval d2 between the adjacent partition bodies 3 on the structural body 1 to the bottom width d1 of the partition body 3 is 0.2-3. Figure 12
[0079] In the embodiment, 30 samples with the ratio d2 / d1 being large, d2 / d1=0.2-3 and the ratio d2 / d1 being small are selected for performance testing, and the negative pressure is 85 mmHg, and the suction is continuously performed for 7 days without flushing, and the test results are shown in Table 1:
[0080] Table 1 Comparison of experimental effects of d2 / d1 ratio changes
[0081]
[0082]
[0083] The experimental results prove that when the ratio d2 / d1 is large, the cavity 4 formed by the gradually expanding surface of the adjacent partition bodies 3 is too large, and in the case of increased negative pressure, the cavity 4 supported by the partition body 3 between the porous foam layer 2 and the structural body 1 gradually disappears, the porous foam layer 2 and the structural body 1 are directly in contact, and the compression force of the negative pressure on the wound is not reduced by the partition body 3; after the drainage is completed, due to the lack of rebound force generated by the partition body 3, the porous foam layer 2 and the structural body 1 may be unable to separate due to adhesion caused by the residual gelatinous material in the drainage liquid, causing the volume of the cavity 4 to decrease, so that the structural body 1 becomes dry and hard from the upper surface, gradually causing large-area dryness and hardening and overall blockage.
[0084] When the ratio d2 / d1 is in the reasonable range of 0.2-3, the structural body 1 can still maintain wetness and softness for 3-5 days of continuous suction, the drainage efficiency is not hindered, there is no blockage phenomenon, and the drainage effect is good.
[0085] When the ratio of d2 / d1 is small, the cavity 4 formed by the diverging surface of the adjacent partition body 3 is small, which easily causes the accumulation of the drainage liquid and the blockage of the through hole 5.
[0086] Example 5
[0087] The difference between this embodiment and Example 1 is that the upper surface of the structural body 1 is a rough plane, as shown in Figure 13 .
[0088] The upper surface of the structural body 1 is sealed by the sealing film 6, and the structural body 1 with a rough surface forms damping with the sealing film 6, preventing the displacement of the structural body 1 relative to the sealing film 6, thereby avoiding the risk of loosening and falling off.
[0089] Example 6
[0090] In this embodiment, the surface of the structural body 1 close to the wound side is connected with the porous foam layer 2, and the surface away from the wound side is connected with one or more suction cups 7, which is convenient for sealing with the medical sealing film 6, as shown in Figure 14 . The sealing film 6 is provided with a drainage hole 8, the skirt of the suction cup 7 is attached to the semi-permeable membrane, and the middle cavity of the suction cup 7 is opposite to the position of the drainage hole 8, as shown in Figure 15 .
[0091] After sealing, the structure can be detachably connected with an external negative pressure device and a drainage bag through the suction cup 7, and after connection, the external negative pressure device is started, and the whole system starts negative pressure suction.
[0092] Example 7
[0093] As shown in Figure 16 , another preferred structure is proposed in this embodiment, which is different from Example 1 in that the outer surface of the partition body 3 is provided with protrusions in dense and regular or irregular distribution, and the front part of the protrusion can be designed as a spike or a cone, or a chamfered protrusion.
[0094] When the PVA is planted on the lower surface of the structural body 1 by the coating process through heat baking, the gas mixed in the foam material stock solution expands in volume during the heating process, forming bubbles that evaporate and rise. The small bubbles in the uppermost layer gradually break, and the small bubbles with broken openings are filled in the gaps of the protrusions on the outer surface of the partition body 3. The small bubbles are solidified on the surface of the protrusions and firmly bonded to the outer surface of the partition body 3.
[0095] The above-mentioned seven structures of the utility model, when negative pressure suction is carried out, under the action of negative pressure, the structure body will form a conduction cavity around the partition body, when being used in clinic, in the near heart tissue such as abdomen, back and blood supply rich face, the negative pressure size of 120mmHg is given, the partition body 3 is stable and firm and will not fall down, so that stable multiple conduction cavities are formed, for the distal end of the limbs with poor blood supply, when the suction negative pressure is as high as 400mmHg, the above-mentioned conduction cavity is still stable and firm, when the lower small hole is blocked by blood clots or pus gelatinous substances, the multiple conduction cavities can still continuously conduct negative pressure and suck away the blood clots or pus gelatinous substances, so as to solve the blocking problem.
[0096] The utility model greatly reduces the pressure area of granulation on the wound, and is superior to PVA material, PU material and gauze, and the reason is that: 1, the partition body structure forms LCP (limited contact plane), and forms a bridge-shaped connection network on the wound and granulation tissue bed, which provides sufficient space for granulation growth;2, the LCP formed by the partition body structure of the utility model is much less than PVA material, PU material and gauze, so the pressure of the wound material on the granulation is more effectively reduced;3, the pressure intensity of the LCP unit area of the partition body structure of the utility model is much lower than that of the LCP of PVA material, PU material and gauze.
[0097] The utility model can be used for body surface wound and internal wound cavity, when being used for body surface wound, the lower surface of the utility model is designed as PVA flocked structure or the utility model is embedded with PVA wound material, which makes the material and wound tissue more affinity, and provides the best moist healing environment for the healthy growth of endothelial cells in granulation tissue;When being used for internal wound cavity, the inner wall of deep cavity is always wet, and the utility model is soft and easy to bend, so the partition body structure avoids pressing granulation tissue as much as possible, so compared with simply using PVA material, PU material and gauze material, the utility model directly used can significantly improve the wound treatment effect.
[0098] The utility model has excellent treatment effect on the body surface wound with complex terrain, and is suitable for perineum, anus, axillary part, submandibular burn, explosion injury, laceration and explosion injury of limbs, because the gradually gentle reduction of the arc curvature of the partition body makes the absolute support height reach the relatively optimal value required by wound healing physiology. The number, height and curvature of the partition body determine the number and size of the conduction cavity, and further determine the anti-blocking effect;In order to ensure the stability of the partition body, the bottom diameter of the partition body is set to be not more than 10mm, the height is set to be not more than 6mm, and the hardness is set to be 5-40 degrees.
[0099] The drainage structure with full-surface continuous and uniform negative pressure conduction provided by the utility model has the advantages that the drainage is smooth and will not be blocked due to the design of multiple holes and multiple supports; when used in combination with PVA material, the drainage structure provides a passage without hardening and collapse, has certain moisturizing effect, makes the PVA material almost not dry and hard, and greatly improves the resilience and permeability; the drainage structure is easy to seal, easy to flush and easy to drain, and therefore the treatment effect and efficiency are remarkably improved.
[0100] The specific embodiments of the utility model are described in detail above, but they are only as examples, and the utility model is not limited to the specific embodiments described above. Any equivalent modification and substitution to the utility model by those skilled in the art is also within the scope of the utility model. Therefore, equivalent transformation and modification made without departing from the spirit and scope of the utility model should be covered in the scope of the utility model.
Claims
1. A drainage structure for full-surface, continuous, uniform negative pressure transmission, for use in conjunction with a porous foam layer (2) in a negative pressure drainage operation, characterized in that: The application relates to a porous foam layer structure, which comprises a structural body (1); the structural body (1) is provided with a partition body (3) on one side of the porous foam layer (2), the partition body (3) forms a cavity (4) between the structural body (1) and the porous foam layer (2), the structural body (1) is provided with a through hole (5) on the side opposite to the cavity (4), the through hole (5) communicates the upper space and the lower space of the structural body (1); the ratio of the interval d2 between the adjacent partition bodies (3) on the surface of the structural body (1) and the width d1 of the bottom surface of the partition body (3) is 0.2-3.
2. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, characterized in that: One end of the partition body (3) is a fixed end (3-1) fixed on the structural body (1), and the other end is a top end (3-2); the volume of the partition body (3) is gradually reduced from the fixed end (3-1) to the top end (3-2), so that the cavity (4) forms a gradually expanding surface from the fixed end (3-1) to the top end (3-2) along the surface of the partition body (3).
3. The wound surface full and uniform negative pressure conducting drainage structure according to claim 2, characterized in that: The fixed end (3-1) is circular or polygonal, and the top end (3-2) is a vertex or an end surface.
4. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, characterized in that: The partition body (3) is a rotary body, and the generatrix of the rotary body is a straight generatrix or a curved generatrix.
5. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The axial section of the partition body (3) is one of a triangle, a trapezoid, a circle, a semicircle, an ellipse, a rectangle and a parallelogram, or a combination of two.
6. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The partition body (3) is a columnar structure, and a plurality of flange structures extend outward in the axial direction.
7. The wound drainage structure of claim 6, wherein: The front end of the flange structure is an arc surface or a conical surface.
8. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The outer surface of the partition body (3) is provided with uniform or non-uniform distribution of protrusions.
9. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The surface of the structural body (1) close to the wound surface is connected with the porous foam layer (2), and the surface away from the wound surface is communicated with one or more suction cups (7).
10. The full surface sustained uniform negative pressure conducting drainage structure according to claim 9, characterized in that: The surface of the structural body (1) away from the wound surface is provided with a sealing film (6), the sealing film (6) is provided with a drainage hole (8), the skirt edge of the suction cup (7) is attached to the semi-permeable membrane, and the middle cavity of the suction cup (7) is opposite to the position of the drainage hole (8).
11. The total surface area sustained uniform negative pressure conducting drainage structure according to claim 10, wherein: The surface of the structural body (1) away from the wound surface is a rough plane.
12. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The structural body (1) and the porous foam layer (2) are fixedly connected through sewing or gluing.
13. The total surface area sustained uniform negative pressure conducting drainage structure according to claim 12, wherein: The fixing points between the structural body (1) and the porous foam layer (2) are uniformly distributed.
14. The full surface sustained uniform negative pressure conducting drainage structure according to claim 1, wherein: The structural body (1) is flocked on the surface of the porous foam layer (2) after being heated and dried through a coating process.
15. The uniform negative pressure sustained full-surface conductive drainage structure according to any one of claims 1-14, characterized in that: The partition body (3) is a plurality of partition bodies, which are uniformly arranged on the surface of the structural body (1) close to the wound surface.
16. The uniform negative pressure sustained full surface conductive drainage structure according to any one of claims 1-14, wherein: The bottom surface diameter of the partition body (3) is not greater than 10 mm, and the height is not greater than 6 mm.
17. The uniform negative pressure sustained full surface conductive drainage structure according to any one of claims 1-14, wherein: The porosity of the structural body (1) is 15%-70%.
18. The uniform sustained negative pressure full surface conductive drainage structure according to any one of claims 1-14, wherein: The structural body (1) and the partition body (3) are made of a thermosetting elastomer, rubber or thermoplastic elastomer material.
19. The uniform sustained negative pressure full surface conductive drainage structure according to any one of claims 1-14, wherein: The structural body (1) is formed through a complex molding process, an injection molding process or a molding process.
20. The uniform sustained negative pressure full surface conductive drainage structure according to any one of claims 1-14, wherein: The hardness range of the structural body (1) is 5-35 degrees, and the hardness range of the partition body (3) is 5-40 degrees.