A ventilated pressure ulcer prevention mattress

Abstract

This utility model discloses a ventilated pressure ulcer prevention mattress, comprising, from top to bottom, a fabric layer, a pressure-resistant sponge layer, a jet layer, an air cushion layer, and an anti-slip layer, and an air pump connected to the jet layer and the air cushion layer respectively; the thickness of the pressure-resistant sponge layer is ≥12cm, and the pressure-resistant sponge layer includes a first, second, and third sub-sponge layers from top to bottom, with the density of each sub-sponge layer increasing progressively; the air cushion layer includes multiple spaced airbag strips, each airbag strip being interconnected through latex tubes and individually removable and replaceable; an inflation pipeline is provided between the air cushion layer and the air pump, and a three-way valve is connected in series on the inflation pipeline; the air inlet end of the jet layer is connected to an independent jet pipeline, and the jet pipeline is connected to one of the interfaces of the three-way valve. By switching the conduction path of the three-way valve, the air pump can switch between supplying air to the jet layer and supplying air to the air cushion layer. This ventilated pressure ulcer prevention mattress can effectively prevent and alleviate pressure ulcers.

Description

Technical Field

[0001] This utility model relates to a ventilated pressure ulcer prevention mattress, belonging to the field of medical devices. Background Technology

[0002] Currently, there are many products on the market for pressure ulcer prevention, and their design focuses on reducing vertical pressure or shortening the local pressure time (typical technology such as wave massage). However, none of them fundamentally achieve effective prevention or relief of pressure ulcers. From the perspective of the principle of pressure ulcer prevention, the key lies in reducing the pressure on local tissues. The optimal way to reduce pressure is to increase the contact area between the human body and the supporting surface. By expanding the contact area, the locally concentrated pressure can be dispersed to a larger area, avoiding ischemia and necrosis of local tissues due to continuous high pressure.

[0003] Existing pressure ulcer prevention products have significant technical flaws: On the one hand, most products attempt to distribute pressure by optimizing the softness of cushions or mattresses, but they overlook the fundamental purpose of softening the material: to increase the contact area. Such products can only achieve a slight increase in localized contact area. For example, thin, small-sized cushions, even with adequate softness, cannot achieve effective pressure relief due to their limited overall support range. Similarly, inflatable mattresses or water mattresses, when fully inflated, have weak deformation capabilities and cannot conform to the curves of the human body to expand the contact area, resulting in actual pressure relief far below expectations. Some pressure ulcer patients have reported that using such products not only failed to alleviate their symptoms but also, due to over-reliance on the product's effectiveness, led them to relax proactive preventative measures such as changing positions, ultimately worsening their pressure ulcers.

[0004] On the other hand, products like the undulating circular massage pressure-relieving air cushion rely on the technical logic of reducing pressure by shortening the pressure time (e.g., a dual-chamber air cushion uses two sets of airbags to alternately inflate and deflate, changing the pressure points on the body to reduce the duration of localized pressure). However, this design has a significant flaw: while shortening the localized pressure time, the reduced contact area due to the localized contraction of the support surface actually increases the localized pressure. Taking a dual-chamber air cushion as an example, during the alternating inflation and deflation process, the pressure area in a single instance is only the support surface of one airbag, and the contact area is significantly smaller than the overall support surface, thus increasing the localized pressure. This principle is similar to "puncturing a balloon with a needle"; even if the number of punctures is reduced, a single puncture (i.e., a single instance of high pressure) is sufficient to cause tissue damage. Therefore, such products cannot achieve true pressure ulcer prevention.

[0005] Currently, the only product that can effectively prevent pressure sores by increasing the contact area and reducing local pressure is a sand suspension bed. It maximizes the contact area and evenly distributes pressure by adapting the flowability of sand particles to the curves of the human body. However, this device has problems such as high cost, large size and complicated operation. It is only suitable for professional medical scenarios and cannot meet the needs of pressure sore prevention in home environments, which limits its application scope. Summary of the Invention

[0006] To address the problems existing in the prior art, this utility model provides a ventilated pressure ulcer prevention mattress.

[0007] To achieve the above objectives, this utility model employs a ventilated anti-pressure sore mattress, comprising a fabric layer, an anti-pressure sponge layer, an air-jet layer, an air cushion layer, and an anti-slip layer stacked sequentially from top to bottom, as well as an air pump connected to the air-jet layer and the air cushion layer respectively.

[0008] The thickness of the pressure-resistant sponge layer is ≥12cm, and the pressure-resistant sponge layer includes a first sub-sponge layer, a second sub-sponge layer, and a third sub-sponge layer from top to bottom, with the density of each sub-sponge layer increasing from top to bottom; the air cushion layer includes multiple spaced airbag strips, each airbag strip being interconnected through latex tubing and capable of being individually disassembled and replaced; an inflation pipeline is provided between the air cushion layer and the air pump, and a three-way valve is connected in series on the inflation pipeline; the air inlet end of the jet layer is connected to an independent jet pipeline, and the jet pipeline is connected to one of the interfaces of the three-way valve; by switching the conduction path of the three-way valve, the jet mode of the air pump supplying air to the jet layer and the inflation mode of supplying air to the air cushion layer can be switched.

[0009] As an improvement, the fabric layer has a double-layer structure, with an inner layer of elastic fabric and an outer layer of milk silk fabric.

[0010] As an improvement, the first sub-sponge layer, the second sub-sponge layer, and the third sub-sponge layer are all made of polyether-type polyurethane foam.

[0011] As an improvement, the density of the first sub-sponge layer is 28-32 kg / m³. 3 The density of the second sub-sponge layer is 38-42 kg / m³. 3 The density of the third sub-sponge layer is 48-52 kg / m³. 3 The density of each sub-sponge layer increases in an arithmetic progression.

[0012] As an improvement, a heater is also included, which is connected in series in the inflation line between the air pump and the three-way valve to heat the airflow output by the air pump, thereby realizing the mattress drying function.

[0013] As an improvement, a one-way valve is also included, which is connected in series in the inflation line between the three-way valve and the air cushion layer to prevent gas backflow within the air cushion layer.

[0014] As an improvement, the jet layer is composed of multiple independent airbags spliced ​​together. Each airbag has several air holes on its upper surface, with the openings of the air holes facing the pressure-resistant sponge layer, which is used to deliver airflow to the pressure-resistant sponge layer and the fabric layer to achieve air drying or drying of the mattress.

[0015] As an improvement, the anti-slip layer is made of PVC material, and its surface is integrally molded with a micro-slip structure and a mesh structure.

[0016] As an improvement, the airbag strip is made of PVC material with a wall thickness of 0.3-0.5mm; the cross-section of the airbag strip is rectangular, with a major axis length of 10-14cm and a minor axis length of 5-7cm.

[0017] As an improvement, the three-way valve is a manually controlled three-way valve;

[0018] Alternatively, the three-way valve is an electromagnetically controlled three-way valve, which is electrically connected to the control unit of the air pump. The control unit controls the electromagnetically controlled three-way valve to switch the conduction path, thereby switching between the jet mode and the inflation mode.

[0019] Compared with existing technologies, the ventilated anti-pressure sore mattress of this invention has the following beneficial effects:

[0020] (1) Compared with existing “thin cushions” and “low-deformation air mattresses”, this utility model uses a pressure-resistant sponge layer with a thickness of ≥12cm. The sufficient thickness can fully wrap the human body, greatly increase the contact area between the skin and the mattress, and avoid local tissue necrosis due to high pressure and ischemia.

[0021] (2) The density of the three sub-sponge layers increases from top to bottom. The density gradient design simulates the density stratification of seawater, which not only ensures the softness and fit of the first sub-sponge layer to adapt to the curve of the human body to further expand the contact area, but also provides stable support through the high-density sponge characteristics of the second and third sub-sponge layers, avoiding local pressure concentration due to excessive deformation, and finally achieving uniform pressure distribution, fundamentally reducing the risk of pressure sores.

[0022] (3) The airbag strips are spaced apart and connected by latex tubes. The airbag strips serve as the mattress crossbeams, ensuring uniform overall support through the latex tube connection and preventing the failure of the entire air cushion layer due to the rupture of a single airbag. Compared with existing integrated air cushions, the entire air cushion layer does not need to be replaced after a single airbag strip is damaged, reducing maintenance costs and ensuring continuous and stable support for the mattress, thus avoiding a sudden increase in local pressure due to support failure.

[0023] (4) The design of the jet layer, air pump and three-way valve is adopted. The three-way valve is used to switch to the jet mode. The air pump supplies air to the jet layer. The airflow can directly reach the anti-pressure sponge layer and fabric layer, quickly dry the damp areas of the mattress (such as sweat and excrement residue), keep the skin dry and avoid damage to the skin barrier due to moisture. The jet and inflation modes do not interfere with each other, which can ensure the continuous and stable support of the air cushion layer and open the ventilation as needed, solving the defect of existing products that cannot take into account both support and ventilation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a partial cross-sectional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the gas-filled heating structure of this utility model;

[0027] In the diagram: 1. Fabric layer, 2. Pressure-resistant sponge layer, 21. First sub-sponge layer, 22. Second sub-sponge layer, 23. Third sub-sponge layer, 3. Air jet layer, 31. Air hole, 4. Air cushion layer, 41. Airbag strip, 5. Anti-slip layer, 6. Air pump, 7. Heater, 8. Three-way valve, 9. One-way valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this application will be described in detail below through specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figure 1 , Figure 2As shown, a ventilated pressure-relief mattress includes, from top to bottom, a fabric layer 1, a pressure-relief sponge layer 2, an air-jet layer 3, an air cushion layer 4, and an anti-slip layer 5. Each layer is designed to ensure a stable fit and prevent relative displacement. For example, the fabric layer 1 (inner elastic fabric) elastically adheres to the pressure-relief sponge layer 2, with edges sewn together to form a sleeve-like wrap, ensuring it adapts to the sponge's deformation without detaching. The air-jet layer 3 has silicone positioning protrusions on its upper surface, which are embedded in the grooves on the lower surface of the pressure-relief sponge layer 2, achieving precise positioning through surface adhesion and preventing misalignment and damage. The air-jet layer 3 and the air cushion layer 4 are aligned and secured around their perimeter with Velcro, connected in the middle by an elastic fiber band, allowing the air cushion layer to inflate and deform while limiting lateral sliding. The anti-slip layer 5 has silicone anti-slip dots on its upper surface, which adheres to the lower surface of the air cushion layer 4, with partial adhesive bonding at the edges (avoiding the airbag strips), preventing the mattress from slipping as a whole and not affecting airbag replacement.

[0031] It also includes an air pump 6 that is connected to the jet layer 3 and the air cushion layer 4 respectively. The air pump 6 provides airflow to the jet layer 3 and the air cushion layer 4 respectively through the air passage to support the operation of the jet mode and the inflation mode.

[0032] The anti-pressure sponge layer 2 has a thickness of ≥12cm. This thickness design allows for complete wrapping of the human body, significantly increasing the contact area between the skin and the mattress, and preventing local tissue necrosis due to high pressure and ischemia. Furthermore, the anti-pressure sponge layer 2 includes a first sub-sponge layer 21, a second sub-sponge layer 22, and a third sub-sponge layer 23 from top to bottom. The density of each sub-sponge layer increases from top to bottom. This density gradient design, with the support of the lower high-density sponge, prevents pressure concentration caused by excessive deformation of the upper sponge. Combined with sufficient thickness, this improves the anti-pressure sore effect from the root.

[0033] The air cushion layer 4 includes multiple horizontally spaced airbag strips 41, which can serve as mattress crossbeams to provide a stable support base for the mattress. Each airbag strip 41 is interconnected through a latex tube. The connection end between the latex tube and the airbag strip 41 adopts a quick-release interface (such as a snap-on or threaded tightening type). The inner wall of the interface is equipped with a sealing rubber ring to ensure no air leakage. This ensures that the overall support force of the air cushion layer is uniform and allows the airbag strips 41 to be disassembled and replaced individually. Compared with an integral air cushion, this can significantly reduce maintenance costs and prevent the failure of the entire air cushion layer due to the damage of a single airbag strip, ensuring continuous and stable support and preventing sudden increases in local pressure caused by support interruption.

[0034] An inflation line is provided between the air cushion layer 4 and the air pump 6. A three-way valve 8 is connected in series on the inflation line. The air inlet of the jet layer 3 is connected to an independent jet line, which is connected to one of the interfaces of the three-way valve 8. By switching the conduction path of the three-way valve 8, the jet mode (supplying air from the air pump 6 to the jet layer 3) and the inflation mode (supplying air from the air cushion layer 4) can be switched. In this dual-mode independent switching function, the jet mode can deliver airflow to the pressure-relieving sponge layer 2 and the fabric layer 1 through the jet layer 3, quickly drying damp areas (such as sweat and excrement residue) and solving the problem of pressure sores caused by local dampness; the inflation mode can maintain the support strength of the air cushion layer 4, balancing the pressure relief effect and the comfort of use.

[0035] As an improved embodiment, the fabric layer 1 adopts a double-layer design, which fits well with the anti-pressure sponge layer 2 and matches the skin protection needs of bedridden patients; the inner layer of the fabric layer 1 is an elastic fabric (such as a spandex-cotton blended elastic fabric (15%-20% spandex and 80%-85% cotton)), whose elastic properties can closely fit the surface of the anti-pressure sponge layer 2, and can adapt synchronously with the slight deformation of the sponge during use, avoiding local separation between layers; the outer layer is a milk silk fabric (conventionally, milk protein is mixed with a softener to make a milk slurry, which is then spun into milk protein fibers through wet spinning and scientific treatment, and then woven into fabric), which has multiple advantages: firstly, Firstly, its softness and skin-friendliness are equal to or better than cashmere, and it is rich in amino acids, making it highly compatible with the skin. This reduces discomfort caused by prolonged contact between the skin and the fabric for those who are bedridden, essentially providing a protective layer for the skin and nourishing sensitive or fragile skin. Secondly, it has excellent breathability and moisture-wicking properties, quickly dispersing sweat from the skin surface. Combined with the ventilation function of the air-jet layer 3, it further reduces the risk of pressure sores caused by localized dampness. Thirdly, its abrasion resistance, pilling resistance, and strength are all superior to cashmere, enabling it to withstand frictional wear during long-term use and extending the lifespan of the fabric layer 1. At the same time, its warmth is close to that of cashmere, ensuring comfort in different seasons and comprehensively meeting the skin protection and user experience needs of bedridden individuals.

[0036] As an improved embodiment, such as Figure 1As shown, the first sub-sponge layer 21, the second sub-sponge layer 22, and the third sub-sponge layer 23 all use polyether-type polyurethane foam (commonly known as memory foam) with slow rebound mechanical properties. This material is the core material for preventing pressure sores and has multiple characteristics that adapt to the overall mattress design: In terms of mechanical properties, this foam can absorb impact and release low rebound force. It can quickly adapt to the shape of the human body's pressure surface through stress relaxation to achieve a uniform surface pressure distribution, reduce the pressure at the highest local point to the lowest level, and avoid microcirculation compression. It has stable chemical properties, is non-allergenic and non-volatile irritating substances when in contact with the human body, and has flame retardant effects. At the same time, it has a permeable cell structure, which can ensure breathability and moisture absorption without additional drilling. It can form a breathable channel with the ventilation function of the air jet layer 3, and also take into account the comfort of use in winter and summer. It also has antibacterial, anti-mite, and anti-corrosion properties, which can reduce the frequency of cleaning during long-term use and meet the needs of bedridden people.

[0037] Among them, the three sub-sponge layers together constitute the pressure-resistant sponge layer 2 with a thickness of ≥12cm, and the density increases in an arithmetic progression: for example, the density of the first sub-sponge layer 21 is 28-32kg / m³. 3 The density of the second sub-sponge layer 22 is 38-42 kg / m³. 3 The density of the third sub-sponge layer 23 is 48-52 kg / m³. 3 The first sub-sponge layer 21 is highly soft, allowing it to conform to the curves of the human body, increasing the skin contact area, providing comprehensive coverage, and reducing localized pressure concentration. The second and third sub-sponge layers offer strong support, preventing support failure caused by excessive deformation of the upper sponge. They also adapt to the structure of the anti-pressure sponge layer 2 and the air-cushioning layer 3, which are positioned and bonded through convex points and grooves, providing a basic rigidity for a stable connection between layers and preventing positioning deviation due to excessively soft sponge. The overall density gradient of the anti-pressure sponge layer 2 simulates the increasing density of seawater from shallow to deep, ensuring both softness and comfort for the human body and maintaining the overall shape of the anti-pressure sponge layer 2 through the support of the lower layer. This reduces friction and shear force between the human body and the sponge, while working in conjunction with the support and cushioning of the air cushion layer 4 to form a dual anti-pressure ulcer system that combines sponge coverage to disperse pressure with air cushion support. Practical experience has proven that this system can effectively prevent and alleviate pressure ulcers caused by prolonged bed rest.

[0038] As an improved embodiment, such as Figure 1 As shown, it also includes a heater 7, which is connected in series in the inflation line between the air pump 6 and the three-way valve 8. The heater 7 controls the heating of the airflow output by the air pump 6 and, in conjunction with the air path switching, realizes the mattress drying function. In addition, it also includes a one-way valve 9, which is connected in series in the inflation line between the three-way valve 8 and the air cushion layer 4. The one-way valve 9 only allows airflow to flow unidirectionally from the three-way valve 8 to the air cushion layer 4, which has significant structural stability and pressure ulcer prevention effect.

[0039] As an improved embodiment, such as Figure 2 As shown, the air jet layer 3 is composed of multiple independent airbags spliced ​​together. The number of airbags can be flexibly adjusted according to the size of the mattress (e.g., a 1.8m×2.0m mattress usually has 6-8 independent airbags spliced ​​together, and the size of a single airbag is about 0.3m×1.8m). Several air holes 31 are evenly opened on the upper surface of each independent airbag (a single airbag usually has 12-16 air holes, the diameter of the air holes is about 2-3mm, and the spacing is about 5-8cm). The opening direction of all air holes 31 is perpendicular to the pressure-resistant sponge layer 2. Relying on the design of independent airbags and directional air holes, the air jet layer 3 can continuously deliver airflow to the pressure-resistant sponge layer 2 and the fabric layer 1 through the airflow provided by the air pump 6, so as to achieve room temperature air drying or hot air drying with the heater 7 as needed.

[0040] As an improved embodiment, the anti-slip layer 5 is made of PVC material, which has the characteristics of wear resistance, aging resistance, and waterproof and moisture-proof properties. The surface of the anti-slip layer 5 is integrally formed with a micro-slip structure and a mesh structure. The micro-slip structure on the lower surface of the anti-slip layer 5 is composed of short fiber pile, which is bonded to the PVC substrate through an integral molding process, eliminating the risk of detachment. On the basis of the micro-slip surface, the lower surface of the anti-slip layer 5 also has an additional integrally formed cross mesh pattern, forming a double anti-slip structure with the micro-slip surface. The two work together to achieve the anti-slip function, while the upper surface (the surface in contact with the air cushion layer 4) remains flat and smooth to fit the air cushion layer.

[0041] As an improved embodiment, the airbag strip 41 is made of PVC material with a wall thickness of 0.3-0.5mm to ensure support strength and durability. The cross-section of the airbag strip 41 is rectangular with a major axis length of 10-14cm and a minor axis length of 5-7cm, which improves the support area and pressure distribution effect. The major axis of the rectangular cross-section is consistent with the width of the mattress, and a single airbag strip can cover a wider lateral area. With the spacing of multiple airbag strips in the air cushion layer 4, a continuous lateral support band can be formed, which evenly distributes the weight of the bedridden person to multiple airbag strips and avoids local pressure concentration.

[0042] As an improved embodiment, the three-way valve 8 is a manually controlled three-way valve with an external rotary control switch, which can be operated without additional power supply, and is intuitive and highly reliable.

[0043] Alternatively, the three-way valve 8 may be an electromagnetically controlled three-way valve. The electromagnetically controlled three-way valve adopts an engineering plastic valve body and an electromagnetic coil structure. Its electromagnetic coil is electrically connected to the control unit (such as a control panel or remote control) of the air pump 6. It can automatically switch the conduction path through the electrical signal sent by the control unit (supporting one-button switching and timed switching functions) to achieve automated control and improve ease of use. The mode can be switched remotely or at a time through the control unit.

[0044] Instructions for using this ventilated pressure ulcer prevention mattress:

[0045] Lay the mattress flat on the bed frame, ensuring the anti-slip layer 5 (PVC micro-fleece side down) is tightly fitted to the bed frame to prevent shifting. Connect the main inflation line of the air pump 6 to the three-way valve 8, then connect the inflation line of the three-way valve 8 to the air cushion layer 4 (connected in series with the one-way valve 9), and to the air jet layer 3, ensuring the connections are secure (quick-release connections should be snapped on or threaded tight; check that the sealing rings are undamaged). Turn on the air pump and briefly start it, observing whether the air cushion layer 4 expands evenly (no local collapse of the airbag strip 41) and whether airflow is discharged from the air holes 31 of the air jet layer 3. Simultaneously check that there are no leaks in any of the lines.

[0046] (I) Inflation Mode: Ensuring Stable Support

[0047] Mode activation: If it is a manual three-way valve, rotate the knob to the inflation mark, and the airflow output by the air pump 6 will enter the air cushion layer 4 through the three-way valve 8 and the one-way valve 9; if it is an electromagnetic three-way valve, press the "Inflation Mode" button through the air pump control unit (or remote control) to automatically switch the air path.

[0048] Pressure adjustment: Observe the expansion state of the air cushion layer 4. When the air bag strip 41 supports the mattress (the anti-pressure sponge layer 2 does not collapse obviously), the pressure can be finely adjusted through the pressure adjustment button of the air pump 6 to ensure that the bedridden person's body does not sink obviously and that the touch is comfortable.

[0049] Pressure maintenance: One-way valve 9 automatically blocks the backflow of gas in the air cushion layer 4. Even if the air pump is paused or the mode is switched, the pressure of the air cushion layer remains stable and there is no need for continuous gas replenishment.

[0050] (ii) Air jet mode: moisture-proof air drying / tumble drying

[0051] Mode switching: When ventilation or drying is required, manually rotate the three-way valve to the jet indicator, or press the jet mode button through the control unit of the electromagnetic three-way valve to switch the airflow to the jet layer 3, which then penetrates the anti-pressure sponge layer 2 through the directional air holes 31 and reaches the fabric layer 1.

[0052] Temperature adjustment: If drying is required (such as after cleaning excrement), turn on heater 7 and adjust it through the low temperature (such as 35℃, for daily dehumidification) or high temperature (such as 40℃, for deep drying) setting to avoid burning the skin due to excessive temperature; when only daily ventilation is needed, turn off the heater and use normal temperature airflow.

[0053] When a bedridden person turns over, there is no need to turn off the mattress function. The elastic support of the air cushion layer 4 and the wrapping of the anti-pressure foam layer 2 can adapt to the body's movement and avoid uneven pressure on the mattress. If the same position is maintained for a long time, it is recommended to manually assist turning over every 4 hours, and use the mattress function to further reduce the risk of pressure sores.

[0054] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this utility model and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

Claims

1. A ventilated pressure ulcer prevention mattress, characterized in that, It includes a fabric layer (1), a pressure-resistant sponge layer (2), a jet layer (3), an air cushion layer (4) and an anti-slip layer (5) stacked from top to bottom, and an air pump (6) connected to the jet layer (3) and the air cushion layer (4) respectively; The thickness of the anti-pressure sponge layer (2) is ≥12cm, and the anti-pressure sponge layer (2) includes a first sub-sponge layer (21), a second sub-sponge layer (22) and a third sub-sponge layer (23) from top to bottom. The density of each sub-sponge layer increases from top to bottom. The air cushion layer (4) includes multiple spaced airbag strips (41). Each airbag strip (41) is connected to each other through a latex tube and can be disassembled and replaced individually. An inflation pipeline is provided between the air cushion layer (4) and the air pump (6). A three-way valve (8) is connected in series on the inflation pipeline. An independent air jet pipeline is connected to the air inlet end of the jet layer (3). The jet pipeline is connected to one of the interfaces of the three-way valve (8). By switching the conduction path of the three-way valve (8), the jet mode of the air pump (6) supplying air to the jet layer (3) and the inflation mode of supplying air to the air cushion layer (4) can be switched.

2. The ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The fabric layer (1) has a double-layer structure, with the inner layer being elastic fabric and the outer layer being milk silk fabric.

3. The ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The first sub-sponge layer (21), the second sub-sponge layer (22) and the third sub-sponge layer (23) are all made of polyether-type polyurethane foam.

4. A ventilated pressure ulcer prevention mattress according to claim 1 or 3, characterized in that, The density of the first sub-sponge layer (21) is 28-32 kg / m³. 3 The density of the second sub-sponge layer (22) is 38-42 kg / m³. 3 The density of the third sub-sponge layer (23) is 48-52 kg / m³. 3 The density of each sub-sponge layer increases in an arithmetic progression.

5. A ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, It also includes a heater (7), which is connected in series in the air supply line between the air pump (6) and the three-way valve (8) to heat the airflow output by the air pump (6) and realize the mattress drying function.

6. A ventilated pressure ulcer prevention mattress according to claim 5, characterized in that, It also includes a one-way valve (9), which is connected in series in the inflation line between the three-way valve (8) and the air cushion layer (4) to prevent gas backflow in the air cushion layer (4).

7. A ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The air jet layer (3) is composed of multiple independent airbags spliced ​​together. Each airbag has several air holes (31) on its upper surface. The opening direction of the air holes (31) is towards the pressure-resistant sponge layer (2) and is used to deliver airflow to the pressure-resistant sponge layer (2) and the fabric layer (1) to achieve air drying or drying of the mattress.

8. A ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The anti-slip layer (5) is made of PVC material, and its surface is integrally formed with a micro-slip structure and a mesh structure.

9. A ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The airbag strip (41) is made of PVC material with a wall thickness of 0.3-0.5mm; the cross-section of the airbag strip (41) is rectangular with a major axis length of 10-14cm and a minor axis length of 5-7cm.

10. A ventilated pressure ulcer prevention mattress according to claim 1, characterized in that, The three-way valve (8) is a manually controlled three-way valve; Alternatively, the three-way valve (8) is an electromagnetically controlled three-way valve, which is electrically connected to the control unit of the air pump (6). The control unit controls the electromagnetically controlled three-way valve to switch the conduction path, thereby realizing the switching between the jet mode and the inflation mode.

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