Microenvironment regulation and control type skin grafting fixing and healing promoting device

Abstract

The invention relates to the technical field of burn treatment, in particular to a microenvironment regulation type skin grafting fixing and healing promoting device which comprises a controller, an upper clamping plate and a lower clamping plate. Telescopic pieces are symmetrically arranged on the two sides of the lower clamping plate, connecting rods are hinged to the two ends of each telescopic piece, rotating shafts are fixedly connected to the ends, away from the telescopic pieces, of the connecting rods, and the rotating shafts are in rotating fit with the lower clamping plate and are coaxially and fixedly connected with threaded rods which are in threaded fit with the upper clamping plate; a sealing assembly for providing a sealing environment for a skin grafting part is arranged at the bottom of the upper clamping plate; the top of the upper clamping plate communicates with a ventilation pipe, and an opening and closing assembly used for adjusting the ventilation capacity of the ventilation pipe according to the telescopic degree of the telescopic piece is arranged in the ventilation pipe. A detection assembly used for detecting the swelling degree of the limbs is arranged on the lower clamping plate, and the controller controls the telescopic degree of the telescopic part based on the swelling degree. According to the invention, the clamping force of the skin grafting area can be automatically and dynamically adjusted.

Description

Technical Field

[0001] This invention relates to the field of burn treatment technology, specifically to a microenvironment-controlled skin graft fixation and healing promotion device. Background Technology

[0002] In burn care, skin grafting is an important means of repairing skin defects and restoring limb function and appearance.

[0003] Currently, the commonly used skin graft fixation methods in clinical practice mostly employ traditional splints, pressure bandages, or plaster casts. Among existing technologies, for example, the KV-B6013 fixation splint from Clairade can be used for fixation after orthopedic surgery for hand and wrist fractures, nerve and tendon injuries, and scar contractures. This fixation splint is also commonly used for skin graft fixation, which can fix the skin graft through mechanical pressure, reducing the possibility of skin graft detachment and postoperative infection.

[0004] However, in the actual process of using fixation splints to hold and fix limbs, they usually lack dynamic adjustment capabilities. Postoperatively, the fixation effect often fails due to changes in the degree of swelling, requiring frequent manual adjustments. This not only increases the workload of medical staff but may also cause secondary damage to the skin graft area due to improper operation. Therefore, it is necessary to propose a microenvironment-controlled skin graft fixation and healing promotion device to solve the problem that the fixation effect of existing fixation splints often fails due to changes in the degree of swelling, requiring frequent manual adjustments. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a microenvironment-controlled skin graft fixation and healing promotion device, which is used to monitor the degree of limb swelling and other conditions in real time, thereby achieving stable fixation of the skin graft area, dynamic adjustment of tightness, and promotion of skin graft healing.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a microenvironment-controlled skin graft fixation and healing promotion device, comprising a controller and an upper clamp and a lower clamp for holding the skin graft site on the limb.

[0007] The lower clamping plate is symmetrically equipped with telescopic components on both sides. Each end of the telescopic component is hinged with a connecting rod. The end of the connecting rod away from the telescopic component is fixedly connected to a rotating shaft. The rotating shaft is rotatably connected to the lower clamping plate. Each rotating shaft is coaxially fixedly connected with a threaded rod, which is threadedly connected to the upper clamping plate. The controller is used to adjust the telescopic components to extend and retract, thereby adjusting the tightness of the upper and lower clamping plates in holding the limb.

[0008] The bottom of the upper clamp is equipped with a sealing component to provide a sealed environment for the graft site; the top of the upper clamp is connected to a ventilator, and the ventilator is equipped with an opening and closing component to adjust the ventilation volume of the ventilator according to the degree of extension and retraction of the telescopic component.

[0009] The lower clamp is equipped with a detection component for detecting the degree of swelling of the limb, and the controller controls the extension and retraction of the telescopic component based on the degree of swelling.

[0010] The technical principles of the above solution are as follows: The limb is passed between the upper and lower splints, with the center of the upper splint aligned with the center of the graft site. The controller then retracts the output shaft of the telescopic component, causing the connecting rods at both ends of the telescopic component to rotate, which in turn rotates the threaded rod. This allows the upper splint, which is threaded into the rod, to move up and down, clamping the limb. Simultaneously, the sealing component conforms to the limb skin, creating a sealed space above the graft area. A ventilation tube allows air to enter this sealed space and expel gases generated during the graft healing process. During limb swelling, the pressure on the lower splint increases. The detection component monitors this pressure in real time to track the degree of swelling and sets a threshold. When the swelling exceeds the threshold, the controller extends the telescopic component, reducing the clamping force of the upper and lower splints. Simultaneously, the opening and closing component extends with the telescopic rod, increasing the opening angle and thus increasing the ventilation volume. This accelerates air circulation and renewal within the sealed space, promptly expelling excess secretions and metabolic waste gases that may be generated in the graft area due to swelling.

[0011] The above approach has the following beneficial effects: 1. This invention uses a detection component to monitor the degree of limb swelling in real time. Based on this, the controller dynamically controls the telescopic components to adjust the clamping force of the upper and lower splints, realizing the automatic adjustment of the fixation tightness. This increases the patient's comfort during the wearing process and reduces problems such as ischemia and necrosis of the skin graft area and skin graft displacement caused by untimely or improper manual adjustment in traditional fixation methods.

[0012] 2. This invention automatically controls and adjusts the tightness of the clamps and automatically adjusts the ventilation volume in real time, which can maintain a suitable oxygen concentration and cleanliness in the sealed space, avoid the impact of local environmental deterioration on skin graft healing, and provide more favorable recovery conditions for the skin graft site in a swollen state.

[0013] 3. The automated control of this invention reduces the workload of medical staff, eliminates the need for frequent manual adjustment of the fixation device, and reduces the risk of secondary damage to the skin graft area due to improper operation.

[0014] Furthermore, the sealing assembly includes an annular airbag fixedly connected to the bottom of the upper clamping plate, the annular airbag being circumferentially arranged at the edge of the bottom of the upper clamping plate.

[0015] Beneficial effects: The ring-shaped airbag is soft and elastic. When inflated, it can closely conform to the skin surface of different limb shapes, forming a sealed space with the upper splint, maintaining a reliable seal and reducing the risk of external bacterial infection in the skin graft area.

[0016] Furthermore, symmetrical drive assemblies for inflating the annular airbag are provided on both sides of the lower clamping plate; the drive assembly includes a first piston cylinder, one end of which is hinged to an adjacent connecting rod, a piston block is slidably fitted inside the first piston cylinder, a piston rod is fixedly connected to the piston block, and the end of the piston rod away from the piston block passes through the side wall of the first piston cylinder and is hinged to the adjacent connecting rod; one end of the first piston cylinder is connected to an air tube, and the end of the air tube away from the piston cylinder is connected to the annular airbag.

[0017] Beneficial effects: The drive component is linked with the connecting rod. When the telescopic component drives the connecting rod to adjust the clamping force, the first piston cylinder and the piston rod move relative to each other, automatically inflating and deflating the annular airbag, so that the airbag always stays in contact with the limb skin. No additional power source is required, which simplifies the structure of the device and ensures the dynamic stability of the sealing performance.

[0018] Furthermore, the opening and closing assembly includes a drive box fixedly connected to the side wall of the vent pipe, a second piston cylinder fixedly connected to the inner side wall of the drive box, a piston column slidably fitted to the inner side wall of the second piston cylinder, a U-shaped block fixedly connected to the end of the piston column away from the second piston cylinder, and the second piston cylinder and the first piston cylinder are connected at one end.

[0019] The inner wall of the drive box has symmetrical sliding grooves, and the U-shaped block and the sliding groove are slidably engaged; the inner wall of the vent pipe is rotatably engaged with a first rotating tube, and a first semi-circular plate is fixedly connected to the side wall of the first rotating tube; one end of the first rotating tube extends through the side wall of the vent pipe into the drive box and is fixedly connected to a first actuating rod, and the end of the first actuating rod away from the first rotating tube is hinged to the U-shaped block.

[0020] The first rotating tube is rotatably fitted with a second rotating tube. One end of the second rotating tube extends through the side wall of the vent tube into the drive box and is fixedly connected to a second actuating rod. The end of the second actuating rod away from the second rotating tube is hinged to the U-shaped block. A second semi-circular plate is fixedly connected to the side wall of the second rotating tube, and the second semi-circular plate extends through the side wall of the first rotating tube.

[0021] Beneficial effect: The U-shaped block drives the first and second actuating rods, causing the first and second semicircular plates to rotate and open synchronously, thereby achieving the function of regulating the gas flow of the vent pipe.

[0022] Furthermore, the detection component includes a pressure sensor layer fixedly connected to the top of the lower clamp, and a controller for receiving pressure signals sent by the pressure sensor layer indicating that the limb is swollen and is squeezing the pressure sensor layer, and controlling the extension and retraction of the telescopic rod based on the pressure signals.

[0023] Beneficial effects: During skin grafting surgery, the skin and subcutaneous tissue are subjected to cutting, peeling, and other traumas, which can lead to local vascular damage. After the vascular endothelial cells are damaged, their barrier function is weakened and vascular permeability increases, making it easier for components such as fluid and protein in the blood vessels to penetrate into the surrounding tissue spaces, causing tissue edema. This, in turn, leads to limb swelling and pressure on the splint's pressure sensor layer. By detecting the limb pressure on the pressure sensor layer, the clamping force can be intelligently adjusted, improving patient comfort.

[0024] Furthermore, the bottom of the upper clamp is provided with a dressing layer for fixing the skin graft.

[0025] Beneficial effects: The dressing layer is in direct contact with the skin graft, which can provide stable support and fixation for the skin graft, prevent the skin graft from shifting during limb movement or device adjustment, and at the same time provide a soft contact environment for the skin graft area, reducing friction damage.

[0026] Furthermore, the dressing layer consists of a petroleum jelly gauze layer and a sterile gauze layer.

[0027] Beneficial effects: The petroleum jelly gauze layer has a lubricating effect, which can reduce the adhesion between the dressing and the skin graft, while the sterile gauze layer can absorb the exudate in the skin graft area, keep the local area dry and clean, and reduce the risk of infection.

[0028] Furthermore, several weight-reducing holes are opened on the lower clamping plate, and the weight-reducing holes are evenly distributed. A transparent observation window is opened on the upper clamping plate.

[0029] Beneficial effects: The weight-reducing holes can significantly reduce the overall weight of the device, reduce the burden on patients when wearing it, and improve comfort; the transparent observation window allows medical staff to directly observe the healing status of the skin graft area without disassembling the device.

[0030] Furthermore, it also includes a drug delivery assembly for applying medication to the dressing layer during skin graft fixation. The drug delivery assembly includes a storage tank for storing a healing-promoting drug solution that promotes healing in the grafted area. The storage tank is fixedly connected to the top of the upper clamping plate. An air duct is connected to the top of the storage tank, and the end of the air duct away from the storage tank is connected to the end of the first piston cylinder. A delivery pipe is connected to the bottom of the storage tank, and a one-way valve is connected inside the delivery pipe. Several application holes are opened at the bottom of the upper clamping plate, and all application holes are connected to the delivery pipe.

[0031] Beneficial effects: The drug delivery component is powered by the movement of the first piston cylinder to automatically deliver the healing-promoting drug solution. It is applied evenly to the dressing layer and skin graft area through the drug application port, eliminating the need for manual application and reducing operational contamination.

[0032] Furthermore, the healing-promoting solution is composed of recombinant human epidermal growth factor active ingredients, phosphate buffer, human serum albumin, and sodium chloride.

[0033] Beneficial effects: Human epidermal growth factor can promote the proliferation and differentiation of cells in the grafted area and accelerate tissue repair; phosphate buffer maintains a stable pH environment of the drug solution and ensures the activity of growth factors; human serum albumin provides nutritional support for cells; sodium chloride regulates the osmotic pressure of the drug solution, making the drug solution more compatible with the human physiological environment, improving the efficacy of the drug, and comprehensively promoting the survival and healing of the grafted skin.

[0034] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0035] Figure 1 This is an isometric view of the microenvironment-controlled skin graft fixation and healing promotion device of the present invention.

[0036] Figure 2 This is a top sectional view of the microenvironment-controlled skin graft fixation and healing promotion device of the present invention.

[0037] Figure 3 This is a lateral sectional axonometric view of the drive box in the microenvironment-controlled skin graft fixation and healing device of the present invention.

[0038] Figure 4 This is a frontal cross-sectional view of the ventilation tube in the microenvironment-controlled skin graft fixation and healing device of the present invention.

[0039] Figure 5 This is a side cross-sectional view of the first piston cylinder in the microenvironment-controlled skin graft fixation and healing device of the present invention.

[0040] The reference numerals in the accompanying drawings of the instruction manual include: 1. Upper clamping plate; 2. Lower clamping plate; 3. Electric telescopic rod; 4. Connecting rod; 5. Threaded rod; 6. Vent pipe; 7. Annular airbag; 8. First piston cylinder; 9. Piston rod; 10. Drive box; 11. Second piston cylinder; 12. Piston column; 13. U-shaped block; 14. First rotating tube; 15. First semicircular plate; 16. First actuating rod; 17. Second rotating tube; 18. Second actuating rod; 19. Second semicircular plate; 20. Observation window; 21. Medicine storage tank. Detailed Implementation

[0041] The following detailed description illustrates the specific implementation method: Example 1

[0042] As attached Figure 1 As shown: A microenvironment-controlled skin graft fixation and healing promotion device includes a controller and an upper splint 1 and a lower splint 2 for clamping the skin graft site on the limb.

[0043] The lower clamping plate 2 is symmetrically provided with telescopic components on both sides. In this embodiment, the telescopic components are electric telescopic rods 3. Both ends of the electric telescopic rods 3 are hinged with connecting rods 4. The ends of the connecting rods 4 away from the telescopic components are integrally formed with rotating shafts, which are rotatably engaged with the lower clamping plate 2. Threaded rods 5 are integrally formed on the rotating shafts (in conjunction with...). Figure 1 As shown, the thread direction of the left threaded rod 5 is left-handed, and the thread direction of the right threaded rod 5 is right-handed. Both threaded rods 5 are threadedly engaged with the upper clamping plate 1. The controller is used to adjust the extension and retraction of the electric telescopic rod 3, thereby adjusting the tightness of the clamping of the limb by the upper clamping plate 1 and the lower clamping plate 2.

[0044] The bottom of the upper clamp 1 is provided with a sealing component for providing a sealed environment for the skin graft site; the top of the upper clamp 1 is connected to a ventilation pipe 6, and the ventilation pipe 6 is provided with an opening and closing component for adjusting the ventilation volume of the ventilation pipe 6 according to the degree of extension and retraction of the telescopic component.

[0045] The lower splint 2 is equipped with a detection component for detecting the degree of swelling of the limb, and the controller controls the degree of extension and retraction of the telescopic component based on the degree of swelling.

[0046] like Figure 1 and Figure 2 As shown, specifically, the sealing assembly includes an annular airbag 7 fixedly bonded to the bottom of the upper clamping plate 1, the annular airbag 7 being circumferentially arranged at the edge of the bottom of the upper clamping plate 1. The lower clamping plate 2 has symmetrically arranged drive assemblies on both sides for inflating the annular airbag 7.

[0047] The ring-shaped airbag 7 is soft and elastic. When inflated, it can closely conform to the skin surface of different limb shapes and form a sealed space with the upper splint 1 to maintain a reliable sealing effect and reduce the risk of external bacterial infection in the skin graft area.

[0048] like Figure 1 and Figure 5 As shown, specifically, the drive assembly includes a first piston cylinder 8, one end of which is hinged to the adjacent connecting rod 4. A piston block is slidably fitted inside the first piston cylinder 8, and a piston rod 9 is integrally formed on the piston block. The end of the piston rod 9 away from the piston block passes through the side wall of the first piston cylinder 8 and is hinged to the adjacent connecting rod 4. Figure 5 The left end of the first piston cylinder 8 is connected to an air tube, and the end of the air tube away from the first piston cylinder 8 is connected to the annular airbag 7.

[0049] Combination Figure 5As shown, when the output shaft of the electric telescopic rod 3 shortens, it drives the adjacent connecting rod 4 to close towards the middle, thereby squeezing the piston rod 9 and causing the piston block to move to the left, so that positive pressure is formed in the first piston cylinder 8. Then, through the air tube, the gas is delivered to the annular airbag 7, so as to achieve the effect of inflating the annular airbag 7. The annular airbag 7 fits against the limb skin and cooperates with the upper splint 1 to form a sealed space above the skin graft area. When the output shaft of the electric telescopic rod 3 extends, it drives the adjacent connecting rod 4 to move away from each other, causing the piston block to move to the right. At this time, the first piston cylinder 8 is under negative pressure, which draws the gas in the annular airbag 7, causing the annular airbag 7 to contract. At the same time, the upper splint 1 and the lower splint 2 reduce the pressure on the limb, thereby reducing the clamping force on the limb.

[0050] like Figure 3 and Figure 4 As shown, specifically, the opening and closing assembly includes a drive box 10 fixedly connected to the side wall of the vent pipe 6 by screws. A second piston cylinder 11 is fixedly connected to the inner wall of the drive box 10 by screws. A piston rod 12 is slidably fitted on the inner wall of the second piston cylinder 11. A U-shaped block 13 is fixedly connected to the end of the piston rod 12 away from the second piston cylinder 11 by screws. The second piston cylinder 11 and Figure 5 The right end of the first piston cylinder 8 is connected.

[0051] The inner wall of the drive box 10 has symmetrical sliding grooves, and the U-shaped block 13 is slidably engaged with the sliding grooves; the inner wall of the vent pipe 6 is rotatably engaged with a first rotating pipe 14, and a first semi-circular plate 15 is integrally formed on the side wall of the first rotating pipe 14; one end of the first rotating pipe 14 extends through the side wall of the vent pipe 6 into the drive box 10 and is integrally formed with a first actuating rod 16, and the end of the first actuating rod 16 away from the first rotating pipe 14 is hinged to the U-shaped block 13.

[0052] The first rotating tube 14 is rotatably fitted with a second rotating tube 17. One end of the second rotating tube 17 extends through the side wall of the vent tube 6 into the drive box 10 and is integrally formed with a second actuating rod 18. The end of the second actuating rod 18 away from the second rotating tube 17 is hinged to the U-shaped block 13. A second semi-circular plate 19 is integrally formed on the side wall of the second rotating tube 17 and penetrates the side wall of the first rotating tube 14.

[0053] Combination Figure 3 As shown, when the limb swells, the controller extends the output shaft of the electric telescopic rod 3. At this time, the clamping force of the upper clamp 1 and lower clamp 2 on the limb decreases. Because the skin graft site needs to expel the gas generated during the healing process and requires more airflow, the adjacent connecting rods 4 move away from each other, causing the piston rod 9 to move the piston block to the right. This increases the pressure on the right side of the first piston cylinder 8, due to the pressure increase on the second piston cylinder 11 and... Figure 5If the right end of the first piston cylinder 8 is connected, the gas inside the first piston cylinder 8 can enter the second piston cylinder 11, causing the piston rod 12 inside the second piston cylinder 11 to extend, thereby driving the U-shaped block 13 to slide upward within the drive box 10. Figure 3 As shown, when the U-shaped block 13 slides upward, it drives the second actuating rod 18, which is hinged to it, to rotate counterclockwise, and drives the second rotating tube 17 to rotate counterclockwise; the U-shaped block 13 drives the first actuating rod 16, which is hinged to it, to rotate clockwise, and drives the first rotating tube 14 to rotate clockwise, so that the first rotating tube 14 and the second rotating tube 17 rotate relative to each other.

[0054] Combination Figure 4 As shown, since a second semicircular plate 19 is fixed on the side wall of the second rotating tube 17 and the second semicircular plate 19 passes through the side wall of the first rotating tube 14, when the first rotating tube 14 and the second rotating tube 17 rotate relative to each other, the included angle between the first semicircular plate 15 and the second semicircular plate 19 decreases, thereby increasing the ventilation flow rate in the ventilation tube 6 and thus increasing the ventilation effect in the grafted area.

[0055] like Figure 1 As shown, specifically, the detection component includes a pressure sensor layer fixedly bonded to the top of the lower clamp 2, and a controller for receiving pressure signals sent by the pressure sensor layer indicating that the limb is swollen and is squeezing the pressure sensor layer, and controlling the extension and retraction of the telescopic rod based on the pressure signals.

[0056] During skin grafting surgery, the skin and subcutaneous tissue are subjected to cutting, peeling, and other traumas, which can lead to local vascular damage. After the vascular endothelial cells are damaged, their barrier function is weakened and vascular permeability increases, making it easier for components such as fluid and protein in the blood vessels to permeate into the surrounding tissue spaces, causing tissue edema. This, in turn, leads to limb swelling and pressure on the pressure sensor layer of the splint 2. By detecting the limb pressure on the pressure sensor layer, the clamping force can be intelligently adjusted, improving patient comfort.

[0057] The bottom of the upper splint 1 is provided with a dressing layer for fixing the skin graft. The dressing layer consists of a Vaseline gauze layer and a sterile gauze layer.

[0058] The lower clamping plate 2 has several weight-reducing holes, which are evenly distributed. The upper clamping plate 1 has a transparent observation window 20.

[0059] The dressing layer is in direct contact with the skin graft, providing stable support and fixation to prevent displacement during limb movement or device adjustment. It also provides a soft contact environment for the grafted area, reducing friction damage. The petroleum jelly gauze layer acts as a lubricant, reducing adhesion between the dressing and the graft. The sterile gauze layer absorbs exudate from the grafted area, keeping the area dry and clean, reducing the risk of infection. The weight-reducing holes significantly reduce the overall weight of the device, lessening the burden on the patient and improving comfort. The transparent observation window 20 allows medical staff to directly observe the healing status of the grafted area without disassembling the device.

[0060] The specific implementation process is as follows: Medical staff placed the upper splint 1 and the lower splint 2 on both sides of the limb skin graft area. At this time, the initial length of the output shaft of the electric telescopic rod 3 was 10cm, and the distance between the upper splint 1 and the lower splint 2 was about 5cm (adjusted according to the limb diameter).

[0061] The annular airbag 7 has a thickness of 0.5 cm when uninflated. The initial overlap area between the first semicircular plate 15 and the second semicircular plate 19 inside the ventilation tube 6 is 30%, and the ventilation rate is maintained at 2-3 L / h. The initial pressure value of the pressure sensor layer is 0 mmHg (when not in contact with the limb).

[0062] The initial threshold for pressure sensor layer monitoring is set to 5 mmHg, the safety threshold to 20 mmHg, the moderate swelling threshold to 40 mmHg, and the severe swelling threshold to 60 mmHg. After the controller is started, when the pressure sensor layer detects limb contact pressure for the first time and the feedback value reaches 5 mmHg, the controller triggers the electric telescopic rod 3 to shorten, and the output shaft length gradually decreases from 10 cm to 6-8 cm (adapted according to the limb diameter).

[0063] During the closing process of connecting rod 4, the piston block inside the first piston cylinder 8 moves a distance of 3cm, and 50ml of gas is injected into the annular airbag 7 through the air tube. After the annular airbag 7 is inflated, its thickness increases to 1.5cm, and the pressure against the skin reaches 10mmHg, forming a sealed space with a volume of about 100cm³.

[0064] At this time, the clamping pressure of the upper splint 1 and the lower splint 2 on the limb is stabilized at 20 mmHg through the feedback of the pressure sensor layer, ensuring that the skin graft is fixed and does not affect the basic blood circulation.

[0065] If, within 1-3 days after surgery, limb swelling causes the pressure sensor layer pressure value to rise above 40 mmHg, the controller determines it as moderate swelling and immediately controls the output shaft of the electric telescopic rod 3 to extend 2 cm (increasing the length to 9 cm).

[0066] The clamping pressure then drops to 25 mmHg, while the piston block inside the first piston cylinder 8 moves in the opposite direction by 1 cm, and the annular airbag 7 deflates by 10 ml, reducing its thickness to 1 cm. This maintains the pressure of contact with the swollen skin at 8 mmHg, preventing the annular airbag 7 from failing to seal and maintaining the stability of the microenvironment in the skin graft area.

[0067] If the pressure suddenly rises to above 60 mmHg, the output shaft of the electric telescopic rod 3 extends further to 9 cm, the clamping pressure drops to 15 mmHg, and the annular airbag 7 deflates to 30 ml with a thickness of 0.8 cm, prioritizing the protection of limb blood circulation.

[0068] When moderate swelling occurs (electric telescopic rod 3 extends 1cm), the first piston cylinder 8 delivers 10ml of gas to the second piston cylinder 11. The piston rod 12 inside the second piston cylinder 11 extends 2cm, causing the U-shaped block 13 to... Figure 3 The middle and upper parts are moved so that the overlap area of ​​the first semicircular plate 15 and the second semicircular plate 19 is reduced to 10%, and the ventilation volume of the vent pipe 6 is increased to 5L / h, which accelerates the gas exchange in the sealed space.

[0069] In cases of severe swelling, the piston column 12 extends 3 cm, and the overlap area of ​​the first semicircular plate 15 and the second semicircular plate 19 is reduced to less than 5%. The maximum ventilation rate can reach 8 L / h, which can promptly remove tissue gas seeping from the grafted area (such as CO2 concentration, which can be reduced from the initial 0.5% to less than 0.2%).

[0070] After the swelling subsides (the pressure drops below 30 mmHg), the ventilation rate gradually decreases to 3 L / h as the piston column 12 resets, maintaining the humidity in the sealed space at 40% and the temperature at 36-37℃ (a suitable microenvironment for tissue repair).

[0071] 7-10 days post-surgery, when the pressure sensor layer pressure stabilizes at 20-25 mmHg and there is no exudation in the skin graft area (confirmed by observing the permeation fluid of the dressing layer through the observation window 20), the controller controls the electric telescopic rod 3 to fully extend to the initial 10 cm, the annular airbag 7 deflates to the initial 0.5 cm thickness, and the clamping pressure drops below 5 mmHg, at which point medical staff can remove the device.

[0072] This invention uses a detection component to monitor the degree of limb swelling in real time. Based on this, the controller dynamically adjusts the clamping force of the upper splint 1 and lower splint 2 using telescopic components, achieving automated adjustment of the fixation tightness. This increases patient comfort during wear and reduces problems such as ischemia and necrosis of the graft area and skin graft displacement caused by untimely or improper manual adjustments in traditional fixation methods. By automatically controlling and adjusting the clamping tightness and automatically adjusting the ventilation volume in real time, it can maintain a suitable oxygen concentration and cleanliness in the sealed space, avoiding the impact of local environmental deterioration on skin graft healing and providing more favorable recovery conditions for the graft site in a swollen state. At the same time, the automated control of this invention reduces the workload of medical staff, eliminating the need for frequent manual adjustments of the fixation device and reducing the risk of secondary damage to the graft area due to improper operation. Example 2

[0073] As attached Figure 1 As shown, the difference from Embodiment 1 is that it also includes a drug delivery assembly for applying medication to the dressing layer during skin graft fixation. The drug delivery assembly includes a storage tank 21 for storing a healing-promoting medication solution that promotes healing in the grafted area. The storage tank 21 is fixedly connected to the top of the upper clamping plate 1 by screws. An air duct is connected to the top of the storage tank 21, and the end of the air duct away from the storage tank 21 is connected to… Figure 5 The right end of the first piston cylinder 8 is connected; the bottom of the medicine storage tank 21 is connected to a delivery pipe, and a one-way valve is connected inside the delivery pipe. Several application holes are opened at the bottom of the upper clamping plate 1, and all application holes are connected to the delivery pipe. The healing-promoting medicine solution is composed of recombinant human epidermal growth factor active ingredients, phosphate buffer, human serum albumin and sodium chloride.

[0074] The specific implementation process is as follows: Combination Figure 1 and Figure 5 As shown, when the piston rod 9 moves to the right, the pressure on the right side of the first piston cylinder 8 increases, and the liquid enters the storage tank 21 through the air guide tube. At this time, the pressure inside the storage tank 21 increases, and the healing-promoting liquid in the storage tank 21 enters the delivery tube. Since the delivery tube and the application hole are connected, the healing-promoting liquid is sprayed out from the application hole onto the dressing layer and then penetrates into the skin graft area to promote rapid healing of the skin graft.

[0075] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A microenvironment-controlled skin graft fixation and healing promotion device, comprising an upper splint (1) and a lower splint (2) for holding the skin graft site on a limb, characterized in that, It also includes the controller; The lower clamping plate (2) is symmetrically provided with telescopic components on both sides. Both ends of the telescopic components are hinged with connecting rods (4). The end of the connecting rod (4) away from the telescopic component is fixedly connected with a rotating shaft. The rotating shaft is rotatably connected to the lower clamping plate (2). The rotating shaft is coaxially fixedly connected with a threaded rod (5). The threaded rod (5) is threadedly connected to the upper clamping plate (1). The controller is used to adjust the telescopic components to extend and retract, thereby adjusting the tightness of the upper clamping plate (1) and the lower clamping plate (2) in clamping the limb. The bottom of the upper clamp (1) is provided with a sealing component for providing a sealed environment for the skin graft site; the top of the upper clamp (1) is connected to a ventilation pipe (6), and the ventilation pipe (6) is provided with an opening and closing component for adjusting the ventilation volume of the ventilation pipe (6) according to the degree of extension and retraction of the telescopic component. The lower splint (2) is equipped with a detection component for detecting the degree of swelling of the limb, and the controller controls the degree of extension and retraction of the telescopic component based on the degree of swelling.

2. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 1, characterized in that, The sealing assembly includes an annular airbag (7) fixedly connected to the bottom of the upper clamping plate (1), the annular airbag (7) being arranged circumferentially at the edge of the bottom of the upper clamping plate (1).

3. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 2, characterized in that, The lower clamping plate (2) is symmetrically provided with driving components for inflating the annular airbag (7) on both sides; The drive assembly includes a first piston cylinder (8), one end of which is hinged to a connecting rod (4) adjacent to it. A piston block is slidably fitted inside the first piston cylinder (8), and a piston rod (9) is fixedly connected to the piston block. The piston rod (9) extends through the side wall of the first piston cylinder (8) away from the piston block and is hinged to the connecting rod (4) adjacent to it. One end of the first piston cylinder (8) is connected to an air tube, and the end of the air tube away from the piston cylinder is connected to the annular air bag (7).

4. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 3, characterized in that, The opening and closing assembly includes a drive box (10) fixedly connected to the side wall of the vent pipe (6), a second piston cylinder (11) fixedly connected to the inner side wall of the drive box (10), a piston column (12) slidably fitted to the inner side wall of the second piston cylinder (11), a U-shaped block (13) fixedly connected to the end of the piston column (12) away from the second piston cylinder (11), and the second piston cylinder (11) and the first piston cylinder (8) are connected at one end; The inner wall of the drive box (10) has symmetrical grooves, and the U-shaped block (13) slides in fit with the grooves; the inner wall of the vent pipe (6) has a first rotating pipe (14) rotatably fitted, and a first semi-circular plate (15) is fixedly connected to the side wall of the first rotating pipe (14); one end of the first rotating pipe (14) extends through the side wall of the vent pipe (6) into the drive box (10) and is fixedly connected to a first actuating rod (16), and the end of the first actuating rod (16) away from the first rotating pipe (14) is hinged to the U-shaped block (13); The first rotating tube (14) is rotatably fitted with a second rotating tube (17). One end of the second rotating tube (17) extends through the side wall of the vent tube (6) into the drive box (10) and is fixedly connected to a second actuating rod (18). The end of the second actuating rod (18) away from the second rotating tube (17) is hinged to the U-shaped block (13). A second semicircular plate (19) is fixedly connected to the side wall of the second rotating tube (17). The second semicircular plate (19) extends through the side wall of the first rotating tube (14).

5. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 4, characterized in that, The detection component includes a pressure sensor layer fixedly connected to the top of the lower clamp (2). The controller is used to receive the pressure signal sent by the pressure sensor layer, which is caused by limb swelling and pressure on the pressure sensor layer, and to control the extension and retraction of the telescopic rod based on the pressure signal.

6. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 5, characterized in that, The bottom of the upper clamp (1) is provided with a dressing layer for fixing the skin graft.

7. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 6, characterized in that, The dressing layer consists of a petroleum jelly gauze layer and a sterile gauze layer.

8. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 7, characterized in that, Several weight-reducing holes are opened on the lower clamping plate (2), and the weight-reducing holes are evenly distributed. A transparent observation window (20) is opened on the upper clamping plate (1).

9. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 8, characterized in that, It also includes a drug delivery assembly for administering medication to the dressing layer during skin graft fixation. The drug delivery assembly includes a storage tank (21) for storing a healing-promoting solution that promotes healing in the grafted area. The storage tank (21) is fixedly connected to the top of the upper clamp (1). An air duct is connected to the top of the storage tank (21). One end of the air duct away from the storage tank (21) is connected to one end of the first piston cylinder (8). A delivery pipe is connected to the bottom of the storage tank (21). A one-way valve is connected inside the delivery pipe. The bottom of the upper clamp (1) has several application holes, all of which are connected to the delivery pipe.

10. The microenvironment-controlled skin graft fixation and healing promotion device according to claim 9, characterized in that, The healing solution is composed of recombinant human epidermal growth factor active ingredients, phosphate buffer, human serum albumin and sodium chloride.

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