Negative pressure drainage structure and system based on dome support

Abstract

The negative pressure drainage device and system are used for negative pressure drainage operation and comprise a structure body and through holes formed in the structure body and used for drainage, a plurality of supporting bodies are arranged on the lower surface of the structure body, and gaps between the adjacent supporting bodies form drainage channels below the structure body; the upper surface of the structure body is provided with a plurality of hemispherical semi-cavity blind holes in one-to-one correspondence with the supporting bodies, and the semi-cavity blind holes and the supporting bodies form a dome support below the structure body. According to the dome supporting structure designed by the invention, the problems of how to effectively maintain a drainage cavity and reduce indentations on a wound surface are solved, an effective conduction channel is formed on the surface of the porous foam layer through the supporting body structure at the bottom, and an upward movement space is provided for the supporting body under a negative pressure condition through the semi-cavity blind holes in the top.

Description

Technical Field

[0001] The present invention belongs to the technical field of negative pressure closed drainage, and specifically refers to a negative pressure drainage structure and system based on dome support. Background Art

[0002] Negative pressure sealing drainage technology is a complete treatment system consisting of three parallel and continuous actions: "sealing the wound" + "applying negative pressure" + "connecting the drainage". The specific process includes: Sealing the wound is accomplished by foam materials. It is the most basic and necessary medical process in clinical surgery to transform an open wound into a closed wound. At the same time, after the wound is sealed, the flat infected wound is artificially transformed into a cavity, and the cavity provides a space for the next step of negative pressure to work.

[0003] Negative pressure (Vacuum) is achieved by external drainage lines and negative pressure sources. The negative pressure at this time and place refers to the work done by the negative pressure source to compare the pressure in the cavity space on the wound with the blood pressure in the capillaries in the wound tissue. The pressure in the cavity of the wound is much smaller than the pressure in the blood vessels, so it is called negative pressure. Also, because the pressure in the capillaries is much greater than the pressure outside the capillaries, the negative pressure on the wound will directly affect the expansion and bulging of the capillary walls in the wound. The expansion and bulging of the capillary walls cause the spatial volume of the capillary cavity to increase. The increase in space and volume has two major effects: First, the increase of blood flow and blood flow velocity by more than 5-12 times brings a large number of tissue stem cells, oxygen-rich red blood cells and platelet groups (PRP) rich in repair growth factors and various amino acid components for the production of tissue proteins necessary for wound repair. 2. The continuous increase in the space and volume of the local wound will cause the network of capillaries to expand, twist, and clump toward the side walls of the blood vessels, thus forming a fresh, neat, dense, ruby-like granular granulation tissue bed.

[0004] Drainage is the process of connecting the negative pressure source and the cavity on the wound surface by a drainage pipeline. Drainage: 1. It provides a negative pressure source for the cavity on the wound surface, so that the blood pressure in the capillaries in the wound tissue is much greater than the pressure in the cavity, so the blood flow and blood flow rate in the capillaries increase by 5-12 times compared with other tissues outside the wound surface; 2. It continuously and quickly cleans the pollutants, necrotic tissue and necrotic tissue debris, pus, tissue exudate, etc. on the wound surface.

[0005] Therefore, negative pressure (Vacuum), sealing (Sealing), and drainage (Drainage) form a complementary and efficient treatment system. Negative pressure (Vacuum), sealing (Sealing), and drainage (Drainage) are VSD.

[0006] However, there are still some major defects in clinical applications, at least the following problems: (1) Hydrophilic porous foam materials tend to dry out and harden due to water loss after 2-4 days of clinical application, resulting in decreased material resilience, a significant reduction in effective drainage cavities, decreased permeability, and gradual blockage. In addition, under the action of organic colloids such as pus, tissue fluid, exudate, and blood, the pores of the foam material often become adhered, the foam elasticity decreases, the foam material covering the entire wound surface becomes dry and hard, and the drainage effect is greatly reduced; (2) The drainage device with a separator or support structure can form a diversion cavity on the surface of the porous foam material to alleviate the decrease in elasticity of the porous foam material. However, the separator or support structure will exert pressure on the surface of the porous foam material in the direction of the wound under the action of negative pressure, thereby forming an obvious indentation on the surface of the patient's wound, which is easy to affect the doctor's accurate judgment when diagnosing the condition; (3) Existing drainage devices are suitable for flat wounds. However, for wounds with cavity structures, even if they are cut to a suitable size, they cannot fit tightly onto the surface of the porous foam material and are prone to displacement and deformation. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention proposes a negative pressure drainage structure and system based on a dome support, which can reduce the indentation caused by the support body on the wound under negative pressure conditions while maintaining a good drainage effect.

[0008] To achieve the above-mentioned purpose, the present invention is a negative pressure drainage structure based on a dome support, which is used for negative pressure drainage operation and includes a structural body and a through hole arranged on the structural body for drainage. The special feature of the structure is that the surface of the structural body close to the wound surface is the lower surface, and the surface away from the wound surface is the upper surface. The lower surface of the structural body is provided with a plurality of supporting bodies, and the gaps between adjacent supporting bodies form a drainage channel under the structural body; the upper surface of the structural body is provided with a plurality of hemispherical semi-cavity blind holes corresponding to the supporting bodies one by one, and the semi-cavity blind holes and the supporting bodies form a dome support under the structural body.

[0009] Furthermore, the support body is a columnar structure.

[0010] Furthermore, the axial section of the support body is an inverted triangle or an inverted trapezoid.

[0011] Furthermore, the support body is a truncated cone structure that tapers downward.

[0012] Furthermore, the through hole and the half-cavity blind hole are arranged at intervals.

[0013] Furthermore, the semi-cavity blind hole protrudes from the lower surface of the structural body, and the bottom is located in the support body.

[0014] Furthermore, the lower surface of the support body is in an arc shape, and the curvature of the arc is consistent with the curvature of the blind hole of the semi-cavity.

[0015] Furthermore, the structural body is made of thermosetting elastomer, rubber or thermoplastic elastomer.

[0016] Furthermore, the structural body is formed by a composite molding process, an injection molding process or a compression molding process.

[0017] Furthermore, the diameter of the support body is not greater than 10 mm, the height is not greater than 6 mm, and the depth of the semi-cavity blind hole is greater than the thickness of the structural body.

[0018] Furthermore, the hardness range of the structural body is 5 to 35 degrees, and the hardness range of the support body is 5 to 40 degrees.

[0019] The present invention also proposes an inner cavity negative pressure drainage structure based on dome support, comprising a structural body and a through hole for drainage arranged on the structural body, a plurality of support bodies are evenly arranged on one side surface of the structural body, and a plurality of hemispherical semi-cavity blind holes corresponding to the support bodies are arranged on the other side surface, and the semi-cavity blind holes and the support bodies form a dome support on one side of the structural body; The dome support of the structural body is outwardly folded along the center line to form two structural bodies with the bottoms connected and the tops aligned. The half-cavity blind holes of the two structural bodies are opposite to each other. After the air in all two aligned half-cavity blind holes is squeezed out, the pressure between the two half-cavity blind holes makes the two structural bodies fit tightly.

[0020] Furthermore, the structural body is used in conjunction with a porous foam layer, and the porous foam layer is coated on the outside of the structural body and is in contact with the dome support.

[0021] Furthermore, the support body is a truncated cone structure that tapers downward.

[0022] Furthermore, the structural body is made of thermosetting elastomer, rubber or thermoplastic elastomer.

[0023] Furthermore, a drainage tube is inserted between the two folded structural bodies.

[0024] The present invention further proposes a dome-support-based negative pressure drainage system, comprising the above-mentioned dome-support-based negative pressure drainage structure and a suction cup, wherein the bottom of the suction cup is connected to the through hole, and the top is connected to the negative pressure source through a drainage tube.

[0025] Furthermore, the structural body is used in conjunction with a porous foam layer, one side of the porous foam layer is in contact with the dome support, and the other side of the porous foam layer is in contact with the wound.

[0026] Furthermore, the side of the structural body close to the wound surface is flocked on the surface of the porous foam layer after being heat-dried through a coating process.

[0027] Furthermore, the structural body and the porous foam layer are fixedly connected by suturing or gluing, and the structural body and the porous foam layer can be cut and spliced ​​as needed according to the size of the wound surface.

[0028] The negative pressure drainage structure and system based on dome support proposed by the present invention are used in conjunction with a porous foam layer in negative pressure drainage therapy. The support body arranged on the lower surface of the structure body forms a cavity between the structure body and the porous foam layer below, thereby forming an effective conduction channel on the surface of the porous foam layer; under negative pressure conditions, the semi-cavity blind hole located above the support body gives the support body space to move upward, so that the pressure transmitted to the wound by the lower surface of the support body through the porous foam layer gradually decreases, while reducing the indentation caused by the pressure on the surface of the patient's wound; after the negative pressure device stops suction, the pressure in the semi-cavity blind hole above the support body returns to one atmospheric pressure, and the air in the semi-cavity blind hole causes the support body to move downward and maintain rebound. All of these are due to the fact that the curvature of the contact surface between the dome and the endothelial cells gradually increases or decreases as the attraction force of the negative pressure source changes to a greater or lesser extent.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The dome support solves the problem of how to effectively maintain the drainage cavity and reduce the indentation on the wound surface. The support structure at the bottom forms an effective conduction channel on the surface of the porous foam layer, and the semi-cavity blind hole at the top gives the support body space to move upward under negative pressure conditions; 2. The top of the dome support is designed as a semi-cavity blind hole with a hemispherical arc groove, and the bottom of the semi-cavity blind hole is opposite to the support body; before the negative pressure drainage operation, the porous foam layer and the negative pressure drainage structure covering the wound are covered with a medical sealing film, and the air in the semi-cavity blind hole on the upper surface of the structure body is sealed in the hole by the medical sealing film. Under negative pressure conditions, an elastic cavity is formed above the support body; repeated expansion in this way forms a plane covered with countless micro balloons; 3. The support body is designed as a frustum-shaped structure that tapers downward. The gradual and gentle deformation of the curvature of the arc surface of the support body provides a space for negative pressure drainage treatment on the wound surface that can adapt to drastic changes in pressure, while also ensuring continuous and effective drainage and continuous rebound; 4. The inner cavity negative pressure drainage structure based on dome support is suitable for body cavities and can provide an elastic conduction structure for deep cavities; 5. When the drainage structure designed by the present invention is clinically applied to uneven wound surfaces and cavity gaps, under negative pressure conditions, no upper and lower layer displacement and shearing will occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of the present invention; Figure 2 This is a bottom view structural schematic diagram of Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of the top view of the structure of Embodiment 1 of the present invention; Figure 4 This is a schematic structural diagram of a dome support having a circular axial section in Embodiment 1 of the present invention; Figure 5 This is a schematic structural diagram of a dome support having a trapezoidal axial section in Example 1 of the present invention; Figure 6 This is a schematic structural diagram of a dome support having a triangular axial section in Example 1 of the present invention; Figure 7 This is a schematic structural diagram of a dome support having a truncated cone-shaped axial section in Example 1 of the present invention; Figure 8 This is a schematic diagram of the combination of the structural body and the porous foam layer in Example 1 of the present invention; Fig. 9 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Fig.10 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Fig.11 This is a schematic diagram of the structure of Embodiment 4 of the present invention; Fig.12 This is a schematic diagram of the structure of Embodiment 5 of the present invention; Fig.13 This is a schematic diagram of the structure of Embodiment 6 of the present invention; Fig.14 A schematic diagram comparing the negative pressure drainage technique implemented by the prior art device and the present invention; Fig.15 It is a schematic diagram comparing the results of negative pressure drainage performed by the prior art device and the present invention.

[0031] In the figure: structural body 1, through hole 2, drainage channel 3, support body 4, semi-cavity blind hole 5, dome support 6, suction cup 7, porous foam layer 8, drainage tube 9, sealing membrane 10. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1 like Figures 1 to 3As shown, a negative pressure drainage structure based on dome support proposed in this embodiment is used for negative pressure drainage operation, including a structural body 1 and a through hole 2 for drainage arranged on the structural body 1, a plurality of support bodies 4 are evenly arranged on the lower surface of the structural body 1, and the gaps between adjacent support bodies 4 form a drainage channel 3 below the structural body 1; a plurality of hemispherical semi-cavity blind holes 5 corresponding to the support bodies 4 are evenly arranged on the upper surface of the structural body 1, and the semi-cavity blind holes 5 and the support bodies 4 form a dome support 6 below the structural body 1.

[0034] There may be multiple through holes 2 on the structural body 1 , which are spaced apart from the half-cavity blind holes 5 .

[0035] The shape, structure and arrangement of the support body 4 can be designed in various forms and can be adaptively adjusted according to actual needs.

[0036] As an embodiment of the present invention, the support body 4 is a columnar structure, and the axial section is one or a combination of triangle, trapezoid, circle, semicircle, truncated cone, ellipse, rectangle, parallelogram. The structure of the support body 4 with a circular axial section is as follows: Figure 4 As shown, the axial section of the support body 4 is a trapezoidal structure as shown in Figure 5 As shown, the axial section is a triangular structure as shown Figure 6 As shown, the axial section is a truncated cone-shaped structure as shown in Figure 7 shown.

[0037] As an implementation mode, the support body 4 is a truncated cone-shaped structure that tapers downward, the volume of the support body 4 tapers downward from the structural body 1, and the volume of the drainage channel 3 gradually expands from top to bottom along the surface of the support body 4.

[0038] The structural body 1 and the support body 4 are made of thermosetting elastomer, rubber or thermoplastic elastomer. The structure can be formed by a complex molding process, an injection molding process or a compression molding process. The effective porosity of the structural body 1 is preferably 20%-50%; the bottom diameter of the support body 4 is not greater than 8mm, and the height is not greater than 5mm. The hardness range of the structural body 1 is: 20~35 degrees, and the hardness range of the support body 4 is: 20~40 degrees.

[0039] When using, Figure 8 As shown, the structural body 1 is placed on the porous foam layer 8, or the two are fixedly connected by suturing or gluing. The shape of the structural body 1 can be cut and spliced ​​according to the shape and size of the wound surface or wound cavity. The fixing points between the structural body 1 and the porous foam layer 8 are evenly distributed to ensure effective fixation within the cutting area when cutting and using. The bottom of the support body 4 contacts the porous foam layer 8, so that the gap between adjacent support bodies 4 forms a drainage channel 3 below the structural body 1.

[0040] The structural body 1 and the porous foam layer 8 are both flexible structures. The structural body 1 can be a sheet structure, or a roughly sheet structure, on the basis of which there are irregular bodies with deformations such as depressions, protrusions, twists, folds, etc.

[0041] Under the action of negative pressure, the drainage fluid is conducted from the porous foam layer 8 to the drainage channel 3 and drained out through the through hole 2. Since the volume of the support body 4 gradually shrinks downward from the structural body 1, under the action of negative pressure, the lower porous foam layer 8 will contact the side of the support body 4 after being squeezed and deformed. The arc-shaped side increases the contact area between the porous foam layer 8 and the support body 4, so that the pressure on the support body 4 is reduced, thereby reducing the pressure on the wound surface. The structure of the dome support 6 realizes the gradual enhancement of negative pressure therapy and the application of local negative pressure to the wound surface. It follows the trend and gradually changes the contradiction between negative pressure rebound and protection of the integrity of granulation endothelial cells into a perfect parallel and complementary one.

[0042] When the negative pressure drainage technique is implemented by the present invention, the porous foam layer 8 is first spread on the wound surface, the structural body 1 is placed above the porous foam layer 8, the support body 4 below the structural body 1 is in contact with the porous foam layer 8, and then the structural body 1 and the porous foam layer 8 below are covered with a sealing film 10 to complete the sealing of the wound surface (Sealing). The sealing film 10 seals part of the air above the structural body 1 in the semi-cavity blind hole 5; then, an external negative pressure source applies negative pressure (Vacuum) to the cavity. Under the action of negative pressure, the pressure inside the capillaries of the wound is much greater than the pressure outside the capillaries, so the negative pressure on the wound surface will directly affect the expansion and bulging of the capillary walls in the wound surface; next, the drainage tube connects the negative pressure source and the suction cup on the structural body 1, and the drainage is turned on. The porous foam layer 8 is under the negative pressure. Under the action, it is squeezed and deformed in the direction of the negative pressure source, and the pressure of the dome support 6 below the structural body 1 is transmitted to the wound surface through the deformed porous foam layer 8, and begins to cause compression on the capillary endothelial cells on the granulation tissue bed; the drainage fluid is transmitted from the porous foam layer 8 to the drainage channel 3 between the support body 4 below the structural body 1, and is drained out through the through hole 2 and the suction cup 7. As the negative pressure increases, the porous foam layer 8 continues to deform and compress, and the contact between the porous foam layer 8 and the outer surface of the support body 4 increases, and the drainage channel 3 gradually decreases. At the same time, the air in the semi-cavity blind hole 5 at the top of the dome support 6 reserves space for the support body 4 to move upward, and one buffer capsule after another is formed above the dome support 6, which is like a plane formed by countless tiny balloons. The buffer capsule greatly reduces the indentation caused by the support body 4 on the wound surface under strong negative pressure. After the drainage is completed, the pressure in the sealing membrane 10 drops, the porous foam layer 8 is no longer subjected to negative pressure and begins to rebound, and the air in the blind hole 5 of the semi-cavity above the structural body 1 gradually returns to an atmospheric pressure, giving the dome support 6 a downward restoring force. The contact area between the support body 4 and the porous foam layer 8 is reduced, so that the volume of the drainage channel 3 is gradually restored, and the support body 4 maintains the relative space between the structural body 1 and the porous foam layer 8, so that the effective drainage gap is restored.

[0043] Example 2 This embodiment proposes a negative pressure drainage system based on dome support, including the above-mentioned negative pressure drainage structure based on dome support and a suction cup 7, the bottom of the suction cup 7 is connected to the through hole 3, and the top is connected to the negative pressure source through the drainage tube. When in use, a porous foam layer 8 is placed under the structural body 1, one side of the porous foam layer 8 is in contact with the dome support 6, and the other side is in contact with the wound, and the negative pressure drainage structure based on the dome support forms an elastic conductive layer above the porous foam layer 8.

[0044] The surface of the structural body 1 close to the wound surface is connected to the porous foam layer 8, and the surface away from the wound surface is connected to one or more suction cups 7, so as to facilitate sealing with a sealing film 10. Fig. 9The sealing film 10 is provided with drainage holes, the skirt of the suction cup 7 is in contact with the sealing film 10 , and the central cavity of the suction cup 7 is opposite to the drainage holes on the sealing film 10 .

[0045] After sealing, the suction cup 7 is detachably connected to the external negative pressure device and the drainage bag. After the connection is completed, the external negative pressure device is started, and the entire system begins to perform negative pressure suction.

[0046] When the negative pressure drainage structure proposed in the present invention is combined with the negative pressure source of the supporting treatment system, a set of local ecological processes for removing harmful substances and providing repair materials is formed. With the change of the attraction force of the negative pressure source, the structural characteristics of the dome support are used to cause the curvature of the contact surface between the dome support and the endothelial cells to gradually increase or decrease in a wave-like manner. Such repeated gradual and variable treatment effects allow the local granulation growth and the removal of inflammatory factors to show a clear cycle and undulating ecological pattern.

[0047] Example 3 This embodiment proposes a negative pressure drainage system based on dome support, which is different from Embodiment 2 in that the side of the structural body 1 close to the wound surface is flocked on the surface of the porous foam layer 8 after heat drying through a coating process.

[0048] When the present invention is used for body surface wounds, since the body surface is prone to dehydration and drying, the lower surface of the structural body 1 is designed to be a PVA flocking structure or the structural body 1 is embedded with a PVA wound material, which will make the material more compatible with the wound tissue and provide an optimal moist healing environment for the healthy growth of granulation tissue endothelial cells; when used for body wound cavities, since the inner wall of the deep cavity is always moist, and the present invention is soft and easy to bend, the dome support structure avoids compressing the granulation tissue to the greatest extent, so directly using the present invention will significantly improve the wound treatment effect compared with simply using PVA materials, PU materials, gauze materials, etc.

[0049] Example 4 This embodiment proposes a negative pressure drainage system based on a dome support. The difference from Embodiment 2 is that the structural body 1 and the porous foam layer 8 are fixedly connected by suturing or gluing. The shape of the structural body 1 can be cut and spliced ​​according to the shape and size of the wound surface or wound cavity. The fixing points between the structural body 1 and the porous foam layer 8 are evenly distributed to ensure effective fixation within the cutting area when cutting and using. The dome support contacts the porous foam layer 8, so that the downwardly protruding arc surface of the lower surface of the support body 4 forms an upwardly tapering drainage channel 3 on the upper surface of the porous foam layer 8.

[0050] Example 5 The difference between this embodiment and embodiment 1 is that the semi-cavity blind hole 5 of the dome support 6 protrudes from the lower surface of the structural body 1, and the bottom is located in the support body 4. The depth of the semi-cavity blind hole 5 is greater than the thickness of the structural body 1, ensuring that the inner cavity volume of the semi-cavity blind hole 5 can meet the requirements for forming an elastic conductive layer.

[0051] like Fig.10 As shown, the lower surface of the support body 4 is in an arc shape, and the curvature of the arc is consistent with the curvature of the half-cavity blind hole 5 to enhance the elastic effect.

[0052] Example 6 like Fig.11 As shown, this embodiment proposes an inner cavity negative pressure drainage structure based on dome support, including a structural body 1 and a through hole 3 for drainage arranged on the structural body 1, a plurality of support bodies 4 are evenly arranged on one side surface of the structural body 1, and a plurality of hemispherical semi-cavity blind holes 5 corresponding to the support bodies 4 are arranged on the other side surface, and the semi-cavity blind holes 5 and the support bodies 4 form a dome support 6 on one side of the structural body 1; The dome support 6 of the structural body 1 is folded outward along the center line to form two structural bodies 1 connected at the bottom and aligned at the top. The half-cavity blind holes 5 of the two structural bodies 1 are opposite to each other. After the air in all two aligned half-cavity blind holes 5 is squeezed out, the pressure between the two half-cavity blind holes 5 makes the two structural bodies 1 fit tightly.

[0053] Example 7 The difference between this embodiment and embodiment 6 is that the semi-cavity blind hole 5 of the dome support 6 protrudes from the lower surface of the structural body 1, and the bottom is located in the support body 4. Fig.12 The depth of the half-cavity blind hole 5 is greater than the thickness of the structural body 1, ensuring that the inner volume of the half-cavity blind hole 5 can meet the requirements for forming an elastic conductive layer.

[0054] The lower surface of the support body 4 is in an arc shape, and the curvature of the arc is consistent with the curvature of the half-cavity blind hole 5 to enhance the elastic effect.

[0055] Example 8 This embodiment provides a negative pressure drainage system based on a dome support, including the inner cavity negative pressure drainage structure based on a dome support and a drainage tube 9 in Embodiment 4. The dome support 6 of the structural body 1 is folded outward along the midline to form two structural bodies 1 with the bottoms connected and the tops aligned. A drainage tube 9 is inserted between the two folded structural bodies 1. Fig.13 The drainage tube 9 passes through the sealing membrane 10 and is connected to the negative pressure source.

[0056] The steps of using the present invention to operate negative pressure drainage are as follows: 1. Perform debridement and hemostasis according to conventional methods. On the basis of thorough debridement and hemostasis, trim or splice the structure body of appropriate size according to the size, depth and clinical needs of the wound 1; 2. Fold the structural body 1 in half and insert the drainage tube 9 into the structural body 1. The side with the half-cavity blind hole 5 contacts the drainage tube 9. Then squeeze and discharge the air in the aligned half-cavity blind hole 5. The drainage tube 9 is sandwiched in the middle of the structural body 1. Align the compressed half-cavity blind hole 5 to make the structural body 1 fit tightly. The drainage tube 9 needs to be fully inserted into the structural body 1, otherwise the overall hardness is not enough to insert into the sinus tract. 3. Under clean conditions (operate according to sterile specifications), clamp the negative pressure drainage device with hemostatic forceps and insert it into the sinus tract, and make the side with dome support 6 contact the porous foam layer 8. If necessary, suture and fix it appropriately; blind hole of the semi-cavity 4. The sinus opening is covered with a medical sealing film 10 to completely seal it; 5. Connect the outlet of drainage tube 9 to the negative pressure source. According to the condition of the wound, adjust the negative pressure range to between 85mmHg and 450mmHg (16.67KPa and 60KPa). Continue to attract for 5 to 7 days before removing it.

[0057] Example 9 This embodiment proposes a negative pressure drainage system based on dome support, which is different from Embodiment 8 in that the side of the structural body 1 close to the wound surface is flocked on the surface of the porous foam layer 8 after heat drying through a coating process.

[0058] Example 10 This embodiment proposes a negative pressure drainage system based on dome support, which is different from the embodiment 8 in that the structural body 1 and the porous foam layer 8 are fixedly connected by suturing or gluing. The shape of the structural body 1 can be cut and spliced ​​according to the shape and size of the wound surface or wound cavity.

[0059] The present invention can be used for both surface wounds and internal wound cavities. When used for surface wounds, the present invention can not only make it rebound under negative pressure, but also keep it moisturized continuously. In particular, when the present invention is used in combination with hydrophilic PVA foam, it can keep the material moist for more than two weeks. When used for internal wound cavities, since the inner wall of the deep cavity is always moist, and the present invention is soft and flexible, the support structure avoids the compression of tissue to the maximum extent, so the direct use of the present invention will significantly improve the therapeutic effect of surface wounds and body cavity wounds compared with the simple use of PVA materials, PU materials, gauze materials, etc. The present invention has an excellent therapeutic effect on the combination of surface wounds and body cavity wounds with complex terrain, and is suitable for burns, explosion injuries such as abdominal penetration injuries or abdominal explosion injuries, lacerations, and limb crushing explosion injuries in the perineum, anus, axilla, and submandibular. Because the arc curvature of the support body is gradually and gently reduced, the absolute support height reaches the relative optimal value required by the wound healing physiology.

[0060] In order to demonstrate the use effect of the present invention, a negative pressure drainage device with a common support structure (specifically, a drainage structure for continuous and uniform negative pressure conduction on the entire wound surface (PCT patent application number: PCT / CN2024 / 072168)) and a negative pressure drainage device based on dome support proposed in the present invention were used to perform negative pressure drainage on the skin of the arm of a healthy person. Fig.14 As shown, the arm on the left side of the picture uses a negative pressure drainage structure with a flat top and a raised bottom, and the arm on the right side of the picture uses a negative pressure drainage structure based on dome support with a semi-cavity blind hole on the top; the negative pressure is set to 200mmHg for 3 hours, and the effect is as follows Fig.15 As shown, the negative pressure drainage structure with ordinary support on the left side of the picture leaves obvious, uneven indentations on the skin, while the negative pressure drainage structure with dome support on the right side of the picture leaves a faint red mark on the skin, and the skin surface is smooth. As can be seen from the results shown in the figure, when negative pressure drainage is performed on the skin of healthy people for a short time, the negative pressure drainage device based on dome support proposed by the present invention is significantly better than the conventional structure in terms of use effect. If it is applied to the wound surface of patients, it can relieve the pain of patients and bring good news, and enable doctors to clearly see the growth state of granulation tissue on the wound surface, helping doctors to make correct diagnosis. The negative pressure drainage device based on dome support proposed by the present invention has a multi-support design, so that it can drain smoothly and will not be blocked; when used in combination with PVA material, it provides a passage that will not dry and collapse, and has a certain moisturizing effect, so that the hydrophilic PVA material will hardly dry and harden, and the resilience and permeability are also greatly improved; it is easy to seal, easy to rinse, and easy to drain, thus significantly improving the treatment effect and efficiency.

[0061] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A dome-supported negative pressure drainage structure for negative pressure drainage operation, comprising a structural body (1) and a through hole (2) provided on the structural body (1) for drainage, characterized in that: The surface of the structural body (1) close to the wound surface is the lower surface, and the surface away from the wound surface is the upper surface. The lower surface of the structural body (1) is provided with a plurality of support bodies (4), and the gaps between adjacent support bodies (4) form a drainage channel (3) on the lower surface of the structural body (1); the upper surface of the structural body (1) is provided with a plurality of hemispherical semi-cavity blind holes (5) corresponding one-to-one to the support bodies (4), and the semi-cavity blind holes (5) and the support bodies (4) form a dome support (6) on the lower surface of the structural body (1).

2. A dome-supported negative pressure drainage structure according to claim 1, characterized in that: The support body (4) is a columnar structure.

3. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The axial section of the support body (4) is an inverted triangle or an inverted trapezoid.

4. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The support body (4) is a truncated cone-shaped structure that tapers downward.

5. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The through hole (2) and the half-cavity blind hole (5) are arranged at intervals.

6. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The semi-cavity blind hole (5) protrudes from the lower surface of the structural body (1), and the bottom is located in the support body (4).

7. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The lower surface of the support body (4) is in the shape of an arc, and the curvature of the arc is consistent with the curvature of the half-cavity blind hole (5).

8. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The structural body (1) is made of thermosetting elastomer, rubber or thermoplastic elastomer.

9. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The structural body (1) is formed by a composite molding process, an injection molding process or a compression molding process.

10. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The diameter of the support body (4) is not greater than 10 mm, and the height is not greater than 6 mm; the depth of the semi-cavity blind hole (5) is greater than the thickness of the structural body (1).

11. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The hardness range of the structural body (1) is 5 to 35 degrees, and the hardness range of the support body (4) is 5 to 40 degrees.

12. An inner cavity negative pressure drainage structure based on dome support, comprising a structural body (1) and a through hole (2) arranged on the structural body (1) for drainage, characterized in that: A plurality of support bodies (4) are evenly arranged on one side surface of the structural body (1), and a plurality of hemispherical semi-cavity blind holes (5) corresponding one to one with the support bodies (4) are arranged on the other side surface, wherein the semi-cavity blind holes (5) and the support bodies (4) form a dome support (6) on one side of the structural body (1); The dome support (6) of the structural body (1) is folded outward along the center line to form two structural bodies (1) connected at the bottom and aligned at the top. The half-cavity blind holes (5) of the two structural bodies (1) are opposite to each other. After the air in the two aligned half-cavity blind holes (5) is squeezed out, the pressure between the two half-cavity blind holes (5) makes the two structural bodies (1) fit tightly together.

13. The inner cavity negative pressure drainage structure based on dome support according to claim 12, characterized in that: The structural body (1) is used in conjunction with a porous foam layer (8); the porous foam layer (8) is coated on the outside of the structural body (1) and is in contact with the dome support (6).

14. The inner cavity negative pressure drainage structure based on dome support according to claim 12, characterized in that: The support body (4) is a truncated cone-shaped structure that tapers downward.

15. The inner cavity negative pressure drainage structure based on dome support according to claim 12, characterized in that: The structural body (1) is made of thermosetting elastomer, rubber or thermoplastic elastomer.

16. The dome-supported inner cavity negative pressure drainage system according to claim 12, characterized in that: A drainage tube (9) is inserted between the two folded structural bodies (1).

17. A negative pressure drainage system based on dome support, characterized in that: It comprises a dome-supported negative pressure drainage structure and a suction cup (7) as claimed in any one of claims 1 to 11, wherein the bottom of the suction cup (7) is connected to the through hole (2), and the top is connected to the negative pressure source via a drainage tube.

18. A dome-supported negative pressure drainage system according to claim 17, characterized in that: The structural body (1) is used in conjunction with a porous foam layer (8); one side of the porous foam layer (8) is in contact with the dome support (6), and the other side of the porous foam layer (8) is in contact with the wound.

19. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The side of the structural body (1) close to the wound surface is flocked onto the surface of the porous foam layer (8) after being heat-dried through a coating process.

20. The negative pressure drainage structure based on dome support according to claim 1, characterized in that: The structural body (1) and the porous foam layer (8) are fixedly connected by sewing or gluing.

21. A negative pressure drainage system based on dome support, characterized in that: It comprises an inner cavity negative pressure drainage structure based on dome support and a suction cup (7) as described in any one of claims 12 to 18, wherein the bottom of the suction cup (7) is connected to the through hole (2), and the top is connected to the negative pressure source through a drainage tube.

22. The dome-supported negative pressure drainage system according to claim 1, characterized in that: The side of the structural body (1) close to the wound surface is flocked onto the surface of the porous foam layer (8) after being heat-dried through a coating process.

23. The dome-supported negative pressure drainage system according to claim 1, characterized in that: The structural body (1) and the porous foam layer (8) are fixedly connected by sewing or gluing.

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