Pressure ulcer prevention device

Abstract

The application discloses a pressure sore prevention device and relates to the technical field of medical devices.The pressure sore prevention device comprises a frame body, a flow guide assembly and an adjusting assembly.A first seat cushion and a second seat cushion are arranged on the frame body, the first seat cushion is used for supporting the buttocks of a patient, and the second seat cushion is used for supporting the thighs of the patient.The flow guide assembly comprises a compression air bag and a supporting air bag, and the compression air bag is connected to the corresponding supporting air bag through a transmission hose.The adjusting assembly comprises a transmission shaft arranged on the frame body and a fixing frame, a rotating shaft is rotatably arranged on the fixing frame, the transmission shaft is in transmission connection with the rotating shaft, a first eccentric wheel and a second eccentric wheel with opposite eccentric directions are arranged on the rotating shaft, the outer circumferential side surface of the first eccentric wheel abuts against the first seat cushion, and the outer circumferential side surface of the second eccentric wheel abuts against the second seat cushion.The pressure sore prevention device solves the technical problem that the existing pressure sore prevention device is unstable in use, affects the use comfort, has certain safety hazards and is difficult to balance the pressure sore prevention effect and use safety.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a pressure ulcer prevention device. Background Technology

[0002] For patients who use wheelchairs for extended periods, flexible structures are commonly used to optimize the seating of electric wheelchairs. These flexible structures can effectively cushion local pressure, evenly distribute the force on the body, and conform to the physiological contours of the perineum, reducing hard compression, lowering the pressure on the perineal area, preventing pressure sores, and providing a safe and comfortable mobility guarantee for patients who rely on electric wheelchairs for a long time.

[0003] However, existing pressure ulcer prevention devices still have the following technical drawbacks: Pressure ulcer prevention cushions use flexible, inflatable cushion structures such as airbags. The air inside the cushion is easily affected by the patient's weight distribution and subtle body movements, causing continuous airflow and resulting in deformation, wobbling, and slippage of the cushion. Uneven deformation and undulation of the cushion surface lead to instability in the patient's sitting posture, affecting not only comfort but also posing certain safety hazards. Furthermore, height adjustment is not possible, making it difficult to balance pressure ulcer prevention effectiveness with safety. Therefore, this paper proposes a pressure ulcer prevention device to address these problems. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-pressure ulcer device that solves the technical problem that existing anti-pressure ulcer devices cause patients to have unstable sitting postures, which not only affects the comfort of use but also poses certain safety hazards. Furthermore, it is difficult to balance the anti-pressure ulcer effect with the safety of use.

[0005] To achieve the above objectives, the present invention provides an anti-pressure ulcer device, comprising: a frame, a flow guiding component, and an adjustment component; The frame is provided with a first seat cushion and a second seat cushion. The first seat cushion is used to support the patient's buttocks, and the second seat cushion is used to support the patient's thighs. The airflow guiding component includes: compression airbags respectively disposed under the first seat cushion and the second seat cushion, and support airbags respectively disposed on the first seat cushion and the second seat cushion, wherein the compression airbags are connected to the corresponding support airbags through transmission hoses; The adjustment assembly includes: a drive shaft and a fixed frame mounted on the frame. A rotating shaft is rotatably mounted on the fixed frame. The drive shaft is drively connected to the rotating shaft. A first eccentric wheel and a second eccentric wheel with opposite eccentric directions are mounted on the rotating shaft. The outer peripheral side of the first eccentric wheel abuts against the first seat cushion, and the outer peripheral side of the second eccentric wheel abuts against the second seat cushion. The drive shaft can be driven to rotate to drive the rotating shaft to rotate, causing the first eccentric wheel and the second eccentric wheel to rotate, so as to alternately drive the first seat cushion and the second seat cushion to move up and down.

[0006] Preferably, the adjustment assembly further includes: a transmission rod disposed on the frame and a curved bracket disposed on the transmission shaft, a push plate sleeved on the transmission rod, the transmission rod being driven to rotate to drive the push plate to swing the curved bracket by a first preset angle, thereby causing the curved bracket to drive the transmission shaft to rotate by a second preset angle.

[0007] Preferably, a limiting rod is provided between the two fixed frames, a rotating disk is provided at the end of the curved bracket, the rotating disk is sleeved and connected to the transmission shaft, a notch is provided on the outer circumferential side of the rotating disk, an annular guide rod is provided at the notch position, one end of the annular guide rod is slidably connected to the rotating disk, and the other end abuts against the limiting rod, and a first elastic element is provided on the outer circumferential side of the annular guide rod, one end of the first elastic element abuts against the side of the limiting rod, and the other end abuts against the side of the notch.

[0008] Preferably, the frame is provided with a driving device, the output end of the driving device is connected to the rollers on the frame and the transmission rod, the transmission rod is provided with a first one-way transmission module, the first rotating part of the first one-way transmission module is fixedly connected to the transmission rod, and the push plate is integrally formed on the second rotating part of the first one-way transmission module.

[0009] Preferably, one end of the fixing frame is provided with an assembly frame, and a second one-way transmission module is provided on the assembly frame. The third rotating part of the second one-way transmission module is fixedly connected to the transmission shaft, and the fourth rotating part of the second one-way transmission module is fixedly connected to the worm. The transmission shaft is provided with a worm thread, and the end of the rotating shaft is provided with a turbine that is compatible with the worm thread.

[0010] Preferably, at least two parallel fixed frames are provided on the frame, and each fixed frame is provided with a rotating shaft. At least two first eccentric wheels are provided at intervals in the first section of the rotating shaft, and at least two second eccentric wheels are provided at intervals in the second section of the rotating shaft.

[0011] Preferably, a linkage component is also provided, the linkage component including: a first connecting plate, a second connecting plate, a third connecting plate and a rotating shaft disposed on the frame, the first connecting plate, the second connecting plate and the third connecting plate being respectively located below the first cushion and the second cushion, and a first positioning frame being disposed on one side of the first connecting plate, a second positioning frame being disposed on one side of the second connecting plate and a third positioning frame being disposed on one side of the third connecting plate, the lower ends of the first positioning frame, the second positioning frame and the third positioning frame being rotatably connected to the rotating shaft, and a first gear, a second gear and a third gear being sleeved on the rotating shaft; The upper end of the first positioning frame is rotatably provided with a first swing rod, the first end of the first swing rod is rotatably and slidably connected to the side of the first seat cushion, and the second end of the first swing rod is provided with a fourth gear that is adapted to the first gear. The upper end of the second positioning frame is rotatably provided with a second swing rod. The first end of the second swing rod is rotatably and slidably connected to the side of the first cushion. The second end of the second swing rod is rotatably and slidably connected to the side of the second cushion. The middle part of the second swing rod is provided with a fifth gear that is adapted to the second gear. The upper end of the third positioning frame is rotatably provided with a third swing rod. The first end of the third swing rod is rotatably and slidably connected to the side of the second seat cushion. The second end of the first swing rod is provided with a sixth gear that is adapted to the third gear.

[0012] Preferably, a fixing frame is installed between the first connecting plate and the second connecting plate, and between the second connecting plate and the third connecting plate. The compression airbag is located inside the fixing frame. A positioning plate is provided above the compression airbag. The first seat cushion and the second seat cushion are correspondingly arranged on the top surface of the positioning plate.

[0013] Preferably, a serrated guide rod is installed on the frame, and the outer peripheral sides of both ends of the serrated guide rod are provided with first positioning teeth. A guard plate is slidably provided at both ends of the serrated guide rod, and a sliding hook is installed at the bottom of the guard plate. A cavity is provided inside the sliding hook, and a slider is slidably provided inside the cavity. A through groove communicating with the cavity is provided on the side of the sliding hook, and one side of the slider extends out of the through groove. The bottom surface of the slider is connected to the bottom surface of the cavity through a second elastic element. A serrated rod is installed on the top surface of the slider, and a second positioning tooth that matches the first positioning teeth is provided on the top surface of the serrated rod.

[0014] Preferably, a limiting guide rod is installed on the frame, a baffle is installed on the top of the limiting guide rod, and limiting slide plates are provided on the side of the first seat cushion and the side of the second seat cushion. A through guide hole is provided on the surface of the limiting slide plate, and the limiting guide rod is slidably connected to the guide hole.

[0015] Compared to the aforementioned background technology, the pressure ulcer prevention device provided by the present invention has the following beneficial effects: By controlling the drive shaft to drive the rotating shaft to rotate, the first eccentric wheel and the second eccentric wheel rotate, so as to alternately drive the first cushion and the second cushion to move up and down. When the first eccentric wheel drives the first cushion to descend to the lowest point and the second eccentric wheel drives the second cushion to rise to the highest point, the compression airbag located below the first cushion is compressed, causing the support airbag located above the first cushion to inflate, so as to flexibly support the patient's thigh. The support airbag located above the second cushion is compressed by the thigh, and the gas inside it is transferred to the compression airbag located below the second cushion to stabilize and support the patient's thigh. Conversely, when the first eccentric wheel drives the first cushion to rise to the highest point and the second eccentric wheel drives the second cushion to descend to the lowest point, the compression airbag located below the second cushion is compressed, causing the support airbag located above the second cushion to inflate, so as to flexibly support the patient's thigh. The support airbag located above the first cushion is compressed by the buttocks, and the gas inside it is transferred to the compression airbag located below the first cushion to stabilize and support the patient's buttocks. In other words, at least one of the first or second cushions is in a firm support state, solving the problem of air inside the cushion constantly flowing due to the patient's weight distribution and slight body movements, which can cause the cushion to deform, wobble, and slide. This prevents the patient's thighs or buttocks from swaying side to side or sliding forward and backward due to the soft deformation of the entire cushion, enhancing the patient's sitting stability and improving comfort. For patients with weak lower limbs or poor balance, it can effectively prevent accidental tipping or falls, improving safety. Moreover, at least one of the first or second cushions is in a flexible support state, which can reduce hard pressure on the patient's perineum, reduce the pressure on the perineal area, and prevent pressure sores, thus balancing pressure sore prevention and safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a perspective structural diagram of the pressure ulcer prevention device provided in an embodiment of the present invention; Figure 2 A three-dimensional structural diagram of the pressure ulcer prevention device provided in an embodiment of the present invention, after concealing one of the support airbags; Figure 3 This is a three-dimensional structural diagram of the anti-pressure sore device provided in an embodiment of the present invention after the frame is concealed. Figure 4 This is a three-dimensional structural diagram of the adjustment component provided in an embodiment of the present invention; Figure 5 A perspective view of the adjustment component provided in an embodiment of the present invention from another angle; Figure 6 This is a three-dimensional structural diagram of the linkage component provided in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the protective plate provided in an embodiment of the present invention; Figure 8 for Figure 3 Enlarged view of point A in the middle; Figure 9 for Figure 3 Enlarged view of point B in the middle; Figure 10 for Figure 4 Enlarged view of point C in the middle; Figure 11 for Figure 4 Enlarged view of point D in the middle; Figure 12 for Figure 7 Enlarged diagram of point E in the middle.

[0018] Specifically, 100-Frame; 101-First seat cushion; 102-Second seat cushion; 103-Drive device; 104-Roller; 105-First one-way transmission module; 1051-First rotating part; 1052-Second rotating part; 10521-Push plate; 106-Arc groove; 107-Fixing frame; 108-Positioning plate; 1081-Extrusion block; 109-Serrated guide rod; 1091-First positioning tooth; 110-Guard plate; 111-Sliding hook; 1111-Cavity; 11 12-Through groove; 112-Slider; 113-Second elastic element; 114-Serrated rod; 1141-Second positioning tooth; 115-Limiting guide rod; 116-Baffle; 117-Limiting slide plate; 1171-Guide hole; 200-Flow guiding assembly; 201-Compression airbag; 202-Supporting airbag; 203-Transmission hose; 300-Adjusting assembly; 301-Drive shaft; 302-Fixing frame; 3021-Assembly frame; 303-Limiting rod; 304-Rotating shaft; 3041-Turbine 305-First eccentric wheel; 306-Second eccentric wheel; 307-Transmission rod; 308-Rotating disk; 3081-Notch; 3082-Annular sliding groove; 309-Second unidirectional transmission module; 3091-Third rotating part; 3092-Fourth rotating part; 3010-Worm gear; 3011-Curved bracket; 3012-Annular guide rod; 3013-First elastic element; 400-Linkage assembly; 401-First connecting plate; 402-Second connecting plate; 403-Third connecting plate ; 404-First positioning frame; 405-Second positioning frame; 406-Third positioning frame; 407-Rotating shaft; 408-First gear; 409-Second gear; 4010-Third gear; 4011-First swing rod; 4012-Second swing rod; 4013-Third swing rod; 4014-Fourth gear; 4015-Fifth gear; 4016-Sixth gear; 4017-First sliding sleeve; 4018-Second sliding sleeve; 4019-Third sliding sleeve; 4020-Fourth sliding sleeve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 and Figure 2As shown, to achieve the above objectives, the present invention provides an anti-pressure ulcer device, comprising: a frame 100 and a flow guiding component 200 and an adjustment component 300 disposed on the frame 100. The frame 100 is specifically exemplified by an electric wheelchair. The frame 100 is provided with a first cushion 101 and a second cushion 102. Specifically, one first cushion 101 and two second cushions 102 are provided. The first cushion 101 is located at the top of the frame 100 to support the patient's buttocks, and the two second cushions 102 are located at the top of the frame 100 to support the patient's two thighs respectively. The first cushion 101 and the two second cushions 102 cooperate to form a support structure adapted to the human sitting posture, ensuring comprehensive support for the key parts of the patient's lower body. Optionally, an arc-shaped groove 106 is provided on the side of the first cushion 101 near the second cushion 102 and at the corner of the second cushion 102 near the first cushion 101. The three arc-shaped grooves 106 are combined to form a complete hole, which facilitates ventilation of the patient's perineum.

[0022] like Figure 2 and Figure 8 As shown, the airflow guiding assembly 200 includes compression airbags 201 respectively disposed below the first seat cushion 101 and the second seat cushion 102, and support airbags 202 respectively disposed on the first seat cushion 101 and the second seat cushion 102. The support airbags 202 are preferably attached to the top surface of the first seat cushion 101 and the second seat cushion 102 respectively by Velcro. Each compression airbag 201 is sealed and connected to the corresponding support airbag 202 through a transmission hose 203 to ensure that the gas can be stably transmitted between the compression airbag 201 and the support airbag 202, providing a basis for the subsequent switching between flexible support and firm support. The adjustment assembly 300 includes a drive shaft 301 and a fixed frame 302 mounted on the frame 100. A rotating shaft 304 is rotatably mounted on the fixed frame 302. Optionally, the fixed frame 302 is rotatably connected to the rotating shaft 304 via a bearing. The drive shaft 301 is drively connected to the rotating shaft 304. A first eccentric wheel 305 and a second eccentric wheel 306 with opposite eccentric directions are mounted on the rotating shaft 304. The outer peripheral side of the first eccentric wheel 305 is in close contact with the bottom of the first cushion 101. The outer peripheral side of the second eccentric wheel 306 is respectively in contact with the bottom of the two corresponding second cushions 102, ensuring that the first eccentric wheel 305 and the second eccentric wheel 306 can accurately drive the corresponding first cushion 101 and second cushion 102 to rise and fall when they rotate.

[0023] In use, the drive shaft 301 is controlled to rotate to drive the rotating shaft 304 to rotate synchronously. Since the first eccentric wheel 305 and the second eccentric wheel 306 have opposite eccentric directions, the first eccentric wheel 305 and the second eccentric wheel 306 will alternately drive the first seat cushion 101 and the second seat cushion 102 to move up and down when rotating synchronously. When the first eccentric wheel 305 rotates to its lowest point and the second eccentric wheel 306 rotates to its highest point, the first seat cushion 101 is driven to descend, and the compression airbag 201 below it is compressed. The internal gas is transmitted through the transmission hose 203 to the support airbag 202 on the first seat cushion 101, causing the support airbag 202 above the first seat cushion 101 to inflate and flexibly support the patient's thigh. At the same time, the second seat cushion 102 is driven to rise, and the patient's thigh compresses the support airbag 202 on the second seat cushion 102, transmitting the gas in the support airbag 202 in the opposite direction to the compression airbag 201 below the second seat cushion 102, so that the compression airbag 201 is inflated, achieving firm support for the patient's thigh. When the first eccentric wheel 305 rotates to its highest point and the second eccentric wheel 306 rotates to its lowest point, the second cushion 102 descends, compressing the compression airbag 201 beneath it. Gas is then transferred to the support airbag 202 on the second cushion 102, providing flexible support for the patient's thighs. Simultaneously, the first cushion 101 rises, and the patient's buttocks compress the support airbag 202 on the first cushion 101. Gas is then transferred in the opposite direction to the compression airbag 201 beneath the first cushion 101, providing firm support for the patient's buttocks. Since one of the first cushion 101 and the second cushion 102 is always in a firm support state, this solves the problem of existing inflatable pressure ulcer prevention cushions where the internal gas is easily affected by the patient's weight distribution and slight body movements, leading to overall cushion deformation, wobbling, and sliding. This prevents the patient's thighs or buttocks from swaying left and right or sliding forward and backward due to overall cushion soft deformation, enhancing the stability of the patient's sitting posture and improving the comfort of long-term sitting. For long-term wheelchair users with weak lower limbs and poor balance, it can prevent them from accidentally tipping over or falling due to unbalanced sitting posture, greatly improving their safety.

[0024] It should be noted that one of the first cushion 101 and the second cushion 102 is always in a flexible support state. The flexible support airbag 202 can closely fit the physiological contour of the patient's buttocks, thighs and perineum, reduce the hard pressure on the patient's perineum, effectively reduce the pressure on the perineal area, avoid poor local blood circulation, and prevent the formation of pressure sores, thus taking into account both the pressure sore prevention effect and the safety of use.

[0025] like Figure 2 , Figure 4 and Figure 5As shown, in some embodiments of the present invention, the adjusting assembly 300 further includes a transmission rod 307 disposed on the frame 100 and a curved bracket 3011 disposed on the transmission shaft 301. Optionally, the curved bracket 3011 adopts an integrally formed structure. The outer peripheral side of the transmission rod 307 is tightly fitted with a push plate 10521. Optionally, the push plate 10521 and the transmission rod 307 are fixed by a key connection or interference fit, so that the push plate 10521 can rotate synchronously with the transmission rod 307. The transmission rod 307 is parallel to the transmission shaft 301. The other end of the curved bracket 3011 extends to the side of the push plate 10521 to form a mutually movable mating relationship, ensuring that the lower end of the curved bracket 3011 can be moved when the push plate 10521 rotates. When the drive transmission rod 307 is rotated, the push plate 10521, which is fixedly connected to the transmission rod 307, will rotate synchronously with the transmission rod 307. When the push plate 10521 rotates one revolution, it will cause the curved bracket 3011 to swing around the axis of the transmission shaft 301 by a first preset angle. The swing of the curved bracket 3011 will drive the transmission shaft 301 to rotate synchronously by a second preset angle. Then, through the transmission cooperation between the transmission shaft 301 and the rotating shaft 304, the rotating shaft 304 and the first eccentric wheel 305 and the second eccentric wheel 306 will be driven to rotate, so as to realize the alternating lifting and lowering of the first seat cushion 101 and the second seat cushion 102.

[0026] like Figure 4 and Figure 10As shown, in some embodiments of the present invention, a limiting rod 303 is provided between the two fixed brackets 302. The limiting rod 303 is made of high-strength rigid material and is horizontal and parallel to the transmission shaft 301. A rotating disk 308 is provided at the upper end of the curved bracket 3011. The rotating disk 308 is integrally formed with the end of the curved bracket 3011. The rotating disk 308 has a disc-shaped structure and a mounting hole in its center that matches the outer diameter of the transmission shaft 301, so that the rotating disk 308 is sleeved and connected to the transmission shaft 301. Specifically, the rotating disk 308 and the transmission shaft 301 are connected by a key connection, so that the rotating disk 308, the curved bracket 3011 and the transmission shaft 301 rotate synchronously without relative slippage. In addition, a notch 3081 is provided on the outer circumferential side of the rotating disk 308. The notch 3081 is fan-shaped, and an annular guide rod 3012 is provided at the position of the notch 3081. The lower end of the annular guide rod 3012 is slidably connected to the rotating disk 308. Specifically, an annular sliding groove 3082 is provided on one side of the notch 3081. The lower end of the annular guide rod 3012 is slidably connected to the annular sliding groove 3082. The annular guide rod 3012 and the annular sliding groove 3082 are embedded and slide. The upper end of the annular guide rod 3012 abuts against the limiting rod 303. Through the sliding cooperation between the annular guide rod 3012 and the annular sliding groove 3082, it is ensured that the movement trajectory of the annular guide rod 3012 does not deviate, thereby limiting and correcting the movement trajectory of the curved bracket 3011, and ensuring that the lower end of the curved bracket 3011 is stably cooperated with the push plate 10521.

[0027] In some embodiments, a first elastic element 3013 is provided on the circumferential outer side of the annular guide rod 3012. The first elastic element 3013 is preferably a cylindrical helical spring, sleeved on the circumferential outer side of the annular guide rod 3012. One end of the first elastic element 3013 abuts against the side of the limiting rod 303, and the other end abuts against the side of the notch 3081. In the initial state, the first elastic element 3013 is in a slightly compressed state, which can provide a continuous elastic preload to ensure that the other side of the notch 3081 can abut against the side of the limiting rod 303 facing away from the upper end of the annular guide rod 3012. When the push plate 10521 actuates the curved bracket 3011 to swing forward, the curved bracket 3011 drives the transmission shaft 301 to rotate synchronously in the forward direction. The rotating disk 308, which is fixed to the transmission shaft 301, also rotates synchronously in the forward direction. During the rotation of the rotating disk 308, the lower end of the annular guide rod 3012 slides into the annular sliding groove 3082. At this time, the notch 3081 will exert a squeezing effect on the first elastic element 3013, causing the first elastic element 3013 to be further compressed and store elastic potential energy. When the push plate 10521 leaves the lower end of the curved bracket 3011 and the driving force disappears, the first elastic element 3013 releases the stored elastic potential energy and pushes the rotating disk 308, the transmission shaft 301, and the curved bracket 3011 to rotate in the opposite direction until they return to the initial position, completing a single drive of the transmission shaft 301. The first elastic element 3013 enables the rotary disk 308 and the curved support 3011 to automatically reset without manual operation, thus automating the operation of the lifting adjustment component 300.

[0028] In some embodiments of the present invention, a drive device 103 is provided on the frame 100. Optionally, the drive device 103 is a stepper motor. The dual output ends of the drive device 103 are respectively connected to the roller 104 and the transmission rod 307 on the frame 100. The dual output ends of the drive device 103 are connected by a coupling, so that the drive device 103 can drive the roller 104 to rotate, thereby driving the entire electric wheelchair frame 100 to move and realize the mobility function. Moreover, the power is integrated with the adjustment component 300, so there is no need to add an independent power source for the pressure ulcer prevention device. When the wheelchair moves, it can synchronously drive the transmission rod 307 to rotate, providing stable power for the operation of the adjustment component 300.

[0029] To achieve unidirectional transmission between the transmission rod 307 and the push plate 10521, a first unidirectional transmission module 105 is provided on the transmission rod 307. The first rotating part 1051 of the first unidirectional transmission module 105 is fixedly connected to the transmission rod 307. The first rotating part 1051 and the transmission rod 307 rotate synchronously without relative displacement. The push plate 10521 is integrally formed on the second rotating part 1052 of the first unidirectional transmission module 105. Specifically, the push plate 10521 extends along the radial direction of the second rotating part 1052. The second rotating part 1052 and the push plate 10521 rotate synchronously without relative displacement. Preferably, the first rotating part 1051 and the second rotating part 1052 are engaged by a pawl and a ratchet to achieve unidirectional transmission. When the transmission rod 307 drives the first rotating part 1051 to rotate in the forward direction, the pawl and the ratchet engage, thereby driving the second rotating part 1052 and the push plate 10521 to rotate synchronously. When the transmission rod 307 rotates in the reverse direction, the pawl and the ratchet disengage, and the second rotating part 1052 and the push plate 10521 remain stationary, avoiding damage to the adjustment component 300 caused by reverse transmission and improving the reliability and safety of the overall anti-pressure sore device. It should be noted that the first unidirectional transmission module 105 is a relatively mature technology in the prior art, similar to the roller-type unidirectional clutch on a bicycle, and will not be described in detail here.

[0030] like Figure 5 and Figure 11As shown, in some embodiments of the present invention, one end of the fixing frame 302 is provided with an assembly frame 3021, and a second one-way transmission module 309 is provided on the assembly frame 3021. Optionally, the assembly frame 3021 adopts a rigid frame structure, with reserved installation space inside to accommodate the second one-way transmission module 309, so as to fix the second one-way transmission module 309 and related transmission components, and at the same time provide a stable assembly reference for the worm gear 3010. The third rotating part 3091 of the second one-way transmission module 309 is fixedly connected to the transmission shaft 301, and the fourth rotating part 3092 of the second one-way transmission module 309 is fixedly connected to the worm gear 3010. The transmission shaft 301 is provided with a worm gear 3010 thread, and the end of the rotating shaft 304 is provided with a turbine 3041. The turbine 3041 is fixed to the end of the rotating shaft 304 by a key connection. The pitch and tooth profile of the worm gear 3010 thread are adapted to the turbine 3041. Similarly, the third rotating part 3091 of the second one-way transmission module 309 is fixedly connected to the transmission shaft 301. The third rotating part 3091 and the transmission shaft 301 rotate synchronously without relative displacement. The fourth rotating part 3092 of the second one-way transmission module 309 is fixedly connected to the worm gear 3010. The fourth rotating part 3092 and the worm gear 3010 rotate synchronously without relative displacement. Preferably, the third rotating part 3091 and the fourth rotating part 3092 are also connected by a pawl and a ratchet to achieve one-way transmission. When the transmission shaft 301 drives the third rotating part 3091 to rotate in the forward direction, the pawl and the ratchet engage, thereby driving the fourth rotating part 3092 and the worm gear 3010 to rotate synchronously, so that the turbine 3041 drives the rotating shaft 304 to rotate. When the drive shaft 301 rotates in the reverse direction, the pawl and ratchet disengage, and the fourth rotating part 3092 and the worm gear 3010 remain stationary, preventing damage to the adjusting component 300 caused by reverse transmission and improving the reliability and safety of the overall anti-pressure sore device. It should be noted that the second one-way transmission module 309 is a relatively mature technology, similar to the roller-type one-way clutch on a bicycle, and will not be described in detail here. When the drive device 103 drives the transmission rod 307 to rotate, the push plate 10521, the curved bracket 3011 and the transmission shaft 301 rotate forward through the first one-way transmission module 105. The transmission shaft 301 drives the third rotating part 3091 of the second one-way transmission module 309 to rotate forward synchronously. The engagement of the pawl and the ratchet drives the fourth rotating part 3092 and the worm 3010 to rotate. The rotating worm 3010 transmits the rotational power of the transmission shaft 301 to the rotating shaft 304, causing the rotating shaft 304 to rotate smoothly. This drives the first eccentric wheel 305 and the second eccentric wheel 306 on the rotating shaft 304 to rotate, realizing the alternating lifting and lowering of the first seat cushion 101 and the second seat cushion 102, and completing the switching between flexible support and solid support.It should be noted that after the push plate 10521 leaves the lower end of the curved bracket 3011, the driving force disappears, the first elastic element 3013 releases the stored elastic potential energy, and pushes the rotating disk 308, the transmission shaft 301 and the curved bracket 3011 to rotate in the opposite direction. At this time, since the pawl and the ratchet disengage, the fourth rotating part 3092 and the worm 3010 remain stationary and will not drive the worm 3010 to rotate in the opposite direction.

[0031] In some embodiments of the present invention, at least two parallel fixing frames 302 are provided on the frame 100. The fixing frames 302 adopt a high-strength rigid structure, are horizontally fixed on the frame 100 and maintain a consistent spacing, so as to provide a stable and reliable support foundation for the rotating shaft 304. Preferably, the frame 100 is provided with four parallel fixed frames 302, and each fixed frame 302 is provided with a rotating shaft 304. The rotating shaft 304 is rotatably connected to the fixed frame 302 through bearings, which can rotate smoothly without radial wobble, ensuring the stability of the transmission process. Each rotating shaft 304 is divided into a first section and a second section. The first section of the rotating shaft 304 is provided with at least two first eccentric wheels 305 at intervals. Specifically, the first section of the rotating shaft 304 is provided with four first eccentric wheels 305 at intervals. The first eccentric wheels 305 are fixed to the rotating shaft 304 by key connection or interference fit. The second section of the rotating shaft 304 is provided with at least two second eccentric wheels 306 at intervals. Specifically, the second section of the rotating shaft 304 is provided with four second eccentric wheels 306 at intervals. The second eccentric wheels 306 are fixed to the rotating shaft 304 by key connection or interference fit. Four first eccentric wheels 305 and four second eccentric wheels 306 rotate synchronously with the rotating shaft 304 while maintaining their positions. They are used to uniformly drive the first seat cushion 101 and the second seat cushion 102 to perform lifting and lowering movements. The spaced arrangement of multiple sets of eccentric wheels ensures that the first seat cushion 101 and the second seat cushion 102 are subjected to more even force during lifting and lowering, avoiding excessive local force that could cause cushion deformation or movement jamming. Furthermore, the stable support of the rotating shaft 304 by the four parallel fixing frames 302, combined with the segmented arrangement of the rotating shaft 304, ensures that the first seat cushion 101 and the second seat cushion 102 are subjected to balanced force during alternating lifting and lowering, effectively preventing tilting or uneven force on the first seat cushion 101 and the second seat cushion 102, and optimizing the comfort of the patient when switching between the support states of the buttocks and thighs.

[0032] like Figure 3 , Figure 6 and Figure 9As shown, in some embodiments of the present invention, a linkage component 400 is also provided. The linkage component 400 includes: a first connecting plate 401, a second connecting plate 402, a third connecting plate 403 and a rotating shaft 407 disposed on the frame 100. The first connecting plate 401, the second connecting plate 402 and the third connecting plate 403 are respectively arranged below the first seat cushion 101 and the second seat cushion 102. A first positioning frame 404 is provided on one side of the first connecting plate 401, a second positioning frame 405 is provided on one side of the second connecting plate 402 and a third positioning frame 406 is provided on one side of the third connecting plate 403. The lower ends of the first positioning frame 404, the second positioning frame 405 and the third positioning frame 406 are rotatably connected to the rotating shaft 407 to provide reliable rotational support and installation reference for the rotating shaft 407. A first gear 408, a second gear 409 and a third gear 4010 are sequentially sleeved on the rotating shaft 407 along the axial direction.A first swing rod 4011 is rotatably mounted on the upper end of the first positioning frame 404. The first end of the first swing rod 4011 is rotatably and slidably connected to the side of the first seat cushion 101. Optionally, a first sliding sleeve 4017 is rotatably mounted on the side of the first seat cushion 101 facing the first swing rod 4011. The first sliding sleeve 4017 is sleeved on the first end of the first swing rod 4011 and slidably connected to the first swing rod 4011. The first swing rod 4011 can adaptively swing and slide with the rise and fall of the first seat cushion 101. A fourth gear 4014 is provided at both ends to mesh with the first gear 408; a second swing rod 4012 is rotatably provided at the upper end of the second positioning frame 405, and the first end of the second swing rod 4012 is rotatably and slidably connected to the side of the first cushion 101. Optionally, a second sliding sleeve 4018 is rotatably provided on the side of the first cushion 101 facing the second swing rod 4012, and the second sliding sleeve 4018 is sleeved on the first end of the second swing rod 4012 and slidably connected to the second swing rod 4012. The second swing rod 4012 can move with the first cushion 101. The second swing rod 4012 rotates and slides to adapt to the lifting and lowering of the second swing rod 4012. Optionally, a third sliding sleeve 4019 is rotatably provided on the side of the second seat 102 facing the second swing rod 4012. The third sliding sleeve 4019 is sleeved on the second end of the second swing rod 4012 and slidably connected to it. A fifth gear 4015, meshing with the second gear 409, is provided in the middle of the second swing rod 4012. A third swing rod 4013 is rotatably provided at the upper end of the third positioning frame 406. The first end of the third swing rod 4013 is rotatably and slidably connected to the side of the second cushion 102. Optionally, a fourth sliding sleeve 4020 is rotatably provided on the side of the second cushion 102 facing the third swing rod 4013. The fourth sliding sleeve 4020 is sleeved on the first end of the third swing rod 4013 and slidably connected to the third swing rod 4013. The third swing rod 4013 can swing and slide adaptively with the rise and fall of the second cushion 102. The second end of the third swing rod 4013 is provided with a sixth gear 4016 that meshes with the third gear 4010.

[0033] In practical application, when the first eccentric wheel 305 drives the first seat cushion 101 to rise and the second eccentric wheel 306 drives the second seat cushion 102 to fall, the first end of the first swing rod 4011 swings upward with the first seat cushion 101 by a preset angle, the first gear 408 drives the fourth gear 4014 to rotate forward by a preset angle, one end of the second swing rod 4012 swings upward with the first seat cushion 101 by a preset angle, and the other end swings downward with the second seat cushion 102 by a preset angle, the second gear 409 drives the fifth gear 4015 to rotate forward by a preset angle, the first end of the third swing rod 4013 swings downward with the second seat cushion 102 by a preset angle, and the third gear 4010 drives the sixth gear 4016 to rotate in the opposite direction by a preset angle. Furthermore, the first seat cushion 101 and the second seat cushion 102 are stably raised and lowered alternately under the drive of the first eccentric wheel 305 and the second eccentric wheel 306, which effectively avoids the problem of unilateral tilting or left and right deviation of the first seat cushion 101 and the second seat cushion 102 during the raising and lowering process, and improves the smoothness of the raising and lowering of the first seat cushion 101 and the second seat cushion 102 as well as the stability of the patient's sitting posture.

[0034] In some embodiments of the present invention, a fixing frame 107 is installed between the first connecting plate 401 and the second connecting plate 402, and between the second connecting plate 402 and the third connecting plate 403. The fixing frame 107 has an opening at the upper end, providing a stable and regular installation space. The compression airbag 201 is disposed inside the fixing frame 107. The fixing frame 107 limits and constrains the compression airbag 201, causing the compression airbag 201 to expand and contract in the vertical direction. This provides precise limiting and effective protection for the compression airbag 201, improving its service life and operational stability. Meanwhile, a positioning plate 108 is provided above the compression airbag 201. The top surface of the positioning plate 108 is correspondingly provided with the first seat cushion 101 and the second seat cushion 102. The positioning plate 108 is kept horizontally arranged. The bottom surface of the positioning plate 108 abuts against the upper surface of the compression airbag 201, and the top surface of the positioning plate 108 is fixedly attached to the corresponding first seat cushion 101 and second seat cushion 102 respectively. The positioning plate 108 provides a flat support surface for the first seat cushion 101 and the second seat cushion 102, so that the expansion and contraction movement of the compression airbag 201 is smoothly transmitted to the corresponding first seat cushion 101 and second seat cushion 102 above. This ensures that the first seat cushion 101 and the second seat cushion 102 are subjected to balanced force during lifting and compression, and there will be no local collapse or shaking. This further avoids the problem of unstable sitting posture caused by deformation or sliding of the first seat cushion 101 and the second seat cushion 102, and improves the safety of the patient when sitting. Optionally, a compression block 1081 is installed at the bottom of the positioning plate 108. The compression block 1081 is set at the top of the compression airbag 201. The compression block 1081 is designed according to the shape and size of the fixing frame 107 to improve the compression effect of the positioning plate 108 on the compression airbag 201.

[0035] like Figure 1 , Figure 7 and Figure 12 As shown, in some embodiments of the present invention, a serrated guide rod 109 is installed on the frame 100. The serrated guide rod 109 is made of rigid material. The outer peripheral surfaces of both ends of the serrated guide rod 109 are integrally machined with uniformly distributed first positioning teeth 1091. Protective plates 110 are slidably disposed on both ends of the serrated guide rod 109 to protect the patient's buttocks and thighs. The through holes at the bottom of the protective plate 110 are slidably fitted onto both ends of the serrated guide rod 109. In addition, the bottom of the protective plate 110... A sliding hook 111 is installed, and a cavity 1111 is provided inside the sliding hook 111. The cavity 1111 is connected to a through hole, and a slider 112 is slidably installed inside the cavity 1111. The inner wall of the cavity 1111 is smoothly polished to ensure that the slider 112 can slide smoothly without jamming. At the same time, a through groove 1112 is provided on the side of the sliding hook 111 to connect to the cavity 1111. One side of the slider 112 extends out of the through groove 1112, which is convenient for medical staff or patients to manually adjust the slider 112. In addition, the bottom surface of the slider 112 is connected to the bottom surface of the cavity 1111 through the second elastic element 113. The second elastic element 113 is preferably a compression spring. A serrated rod 114 is installed on the top surface of the slider 112. The top surface of the serrated rod 114 is provided with a second positioning tooth 1141 that matches the tooth shape and spacing of the first positioning tooth 1091. The second positioning tooth 1141 meshes with the first positioning tooth 1091 to achieve the positioning and fixation of the guard plate 110 on the serrated guide rod 109. The protective plate 110 can slide freely along the axial direction of the serrated guide rod 109 to adjust its position and adapt to the protection needs of patients of different body types. When the protective plate 110 is adjusted to the appropriate position, the slider 112, under the upward preload of the second elastic element 113, drives the serrated rod 114 to rise, so that the second positioning tooth 1141 on the serrated rod 114 engages with the first positioning tooth 1091 on the serrated guide rod 109, firmly locking the protective plate 110 in the current position and preventing it from self-locking. The guard plate 110 can be slid in place. When the position of the guard plate 110 needs to be adjusted, the slider 112 is manually pushed down to extend one side of the through slot 1112. The slider 112 compresses the second elastic element 113 and drives the serrated rod 114 down, causing the second positioning tooth 1141 to disengage from the first positioning tooth 1091. At this time, the guard plate 110 can be pushed to slide along the serrated guide rod 109 to the target position. After releasing the slider 112, the second elastic element 113 resets and drives the serrated rod 114 up, achieving engagement and locking again. Through the engagement of the serrated guide rod 109 and the serrated rod 114, the position of the guard plate 110 can be flexibly adjusted according to the patient's body shape and sitting posture, adapting to the usage needs of different patients. At the same time, it is firmly locked, preventing the guard plate 110 from sliding on its own when the wheelchair moves or the patient's body moves slightly, ensuring stable protective effect. Moreover, the unlocking and adjustment of the guard plate 110 can be completed by simply moving the slider 112, without complicated operation, making it suitable for patients with limited mobility and caregivers, effectively reducing the threshold for use.

[0036] In some embodiments of the present invention, a limiting guide rod 115 is installed on the frame 100. The limiting guide rod 115 is vertically arranged, and its bottom is firmly connected to the frame 100. A limiting slide plate 117 is provided on the side of the first cushion 101 and the side of the second cushion 102. A through guide hole 1171 is provided on the surface of the limiting slide plate 117. The limiting guide rod 115 is slidably connected to the guide hole 1171. Through the sliding cooperation between the limiting guide rod 115 and the guide hole 1171, the limiting slide plate 117 slides stably up and down along the limiting guide rod 115, providing precise vertical guidance for the lifting and lowering movement of the first cushion 101 and the second cushion 102. This improves the movement stability and posture consistency of the first cushion 101 and the second cushion 102 during the alternating lifting and lowering process, ensuring that the first cushion 101 and the second cushion 102 can make smooth lifting and lowering movements in the vertical direction. In addition, a baffle 116 is installed on the top of the limiting guide rod 115 to limit the extreme position of the upward sliding of the limiting slide plate 117, so as to prevent the first seat 101 and the second seat 102 from exceeding the travel during the lifting and lowering process and disengaging from the limiting guide rod 115.

[0037] The working principle of this invention is as follows: The output end of the control drive device 103 drives the rollers 104 on the frame 100 to rotate, thereby moving the entire electric wheelchair and realizing the mobility function. At the same time, it drives the transmission rod 307 to rotate synchronously. The transmission rod 307 drives the first rotating part 1051 of the first one-way transmission module 105 to rotate in the forward direction. Through the engagement of the pawl and ratchet, it drives the second rotating part 1052 and the push plate 10521 to rotate in the forward direction. The push plate 10521 actuates the curved bracket 3011 to swing, thereby driving the transmission shaft 301 to rotate in the forward direction. When the transmission shaft 301 rotates in the forward direction, it synchronously drives the third rotating part 3091 of the second one-way transmission module 309 to rotate in the forward direction. Through one-way engagement, it drives the fourth rotating part 3092 and the worm gear 3010 to rotate in the forward direction. The worm gear 3010, through engagement with the turbine 3041, drives the rotating shaft 304 to rotate in the forward direction. The first eccentric wheel 30 on the rotating shaft 304 has an eccentric direction opposite to that of the first eccentric wheel 30. 5. The second eccentric wheel 306 rotates synchronously, alternately driving the first seat cushion 101 and the second seat cushion 102 to move up and down. When the first seat cushion 101 descends and the second seat cushion 102 rises, the compression airbag 201 on one side of the fixed frame 107 below the first seat cushion 101 is compressed. The gas inside the compression airbag 201 is transmitted through the transmission hose 203 to the support airbag 202 on the first seat cushion 101, causing it to inflate and providing flexible support for the patient's buttocks. At the same time, the support airbag 202 on the second seat cushion 102 is compressed by the patient's thigh, and the gas inside the support airbag 202 is transmitted in the opposite direction to the compression airbag 201 below it, providing firm support for the thigh. When the first seat cushion 101 rises and the second seat cushion 102 descends, the gas transmission process is reversed, realizing the switching between firm support for the buttocks and flexible support for the thigh, always ensuring that at least one seat cushion is in a firm support state and the other is in a flexible support state.

[0038] In summary, by ensuring that at least one of the first cushion 101 or the second cushion 102 is in a firm support state, the patient's thighs or buttocks will not sway side to side or slide forward or backward due to the overall soft deformation of the cushion, thus enhancing the patient's sitting stability and improving comfort. For patients with weak lower limbs or poor balance, it can effectively prevent accidental tipping or falls, improving safety. Moreover, by ensuring that at least one of the first cushion 101 or the second cushion 102 is in a flexible support state, it can reduce hard pressure on the patient's perineum, reduce the pressure on the perineal area, prevent pressure sores, and balance pressure sore prevention with safety.

[0039] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0040] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A pressure ulcer prevention device, characterized in that, include: Frame (100), flow guiding assembly (200) and adjustment assembly (300); The frame (100) is provided with a first cushion (101) and a second cushion (102), the first cushion (101) is used to support the patient's buttocks, and the second cushion (102) is used to support the patient's thighs; The flow guiding component (200) includes: a compression airbag (201) respectively disposed under the first seat cushion (101) and the second seat cushion (102), and a support airbag (202) respectively disposed on the first seat cushion (101) and the second seat cushion (102), wherein the compression airbag (201) is connected to the corresponding support airbag (202) through a transmission hose (203); The adjustment assembly (300) includes a drive shaft (301) and a fixed frame (302) mounted on the frame (100). A rotating shaft (304) is rotatably mounted on the fixed frame (302). The drive shaft (301) is connected to the rotating shaft (304). A first eccentric wheel (305) and a second eccentric wheel (306) with opposite eccentric directions are mounted on the rotating shaft (304). The outer peripheral side of the first eccentric wheel (305) abuts against the first cushion (101), and the outer peripheral side of the second eccentric wheel (306) abuts against the second cushion (102). The drive shaft (301) can be driven to rotate to drive the rotating shaft (304) to rotate, so that the first eccentric wheel (305) and the second eccentric wheel (306) rotate to alternately drive the first cushion (101) and the second cushion (102) to move up and down.

2. The pressure ulcer prevention device according to claim 1, characterized in that, The adjustment assembly (300) further includes: a transmission rod (307) disposed on the frame (100) and a curved bracket (3011) disposed on the transmission shaft (301). A push plate (10521) is sleeved on the transmission rod (307). The transmission rod (307) can be driven to rotate to drive the push plate (10521) to move the curved bracket (3011) to swing by a first preset angle, thereby causing the curved bracket (3011) to drive the transmission shaft (301) to rotate by a second preset angle.

3. The pressure ulcer prevention device according to claim 2, characterized in that, A limiting rod (303) is provided between the two fixed frames (302). A rotating disk (308) is provided at the end of the curved bracket (3011). The rotating disk (308) is sleeved and connected to the transmission shaft (301). A notch (3081) is provided on the outer circumferential side of the rotating disk (308). An annular guide rod (3012) is provided at the position of the notch (3081). One end of the annular guide rod (3012) is slidably connected to the rotating disk (308), and the other end abuts against the limiting rod (303). A first elastic element (3013) is provided on the outer circumferential side of the annular guide rod (3012). One end of the first elastic element (3013) abuts against the side of the limiting rod (303), and the other end abuts against the side of the notch (3081).

4. The pressure ulcer prevention device according to claim 2, characterized in that, The frame (100) is provided with a drive device (103). The output end of the drive device (103) is connected to the roller (104) on the frame (100) and the transmission rod (307). The transmission rod (307) is provided with a first one-way transmission module (105). The first rotating part (1051) of the first one-way transmission module (105) is fixedly connected to the transmission rod (307). The push plate (10521) is integrally formed on the second rotating part (1052) of the first one-way transmission module (105).

5. The pressure ulcer prevention device according to claim 1, characterized in that, One end of the fixed frame (302) is provided with an assembly frame (3021), and a second one-way transmission module (309) is provided on the assembly frame (3021). The third rotating part (3091) of the second one-way transmission module (309) is fixedly connected to the transmission shaft (301), and the fourth rotating part (3092) of the second one-way transmission module (309) is fixedly connected to the worm (3010). The transmission shaft (301) is provided with a worm (3010) thread, and the end of the rotating shaft (304) is provided with a turbine (3041) that is adapted to the worm (3010) thread.

6. The pressure ulcer prevention device according to claim 1, characterized in that, At least two parallel fixed frames (302) are provided on the frame (100), and a rotating shaft (304) is provided on each fixed frame (302). At least two first eccentric wheels (305) are provided at intervals in the first section of the rotating shaft (304), and at least two second eccentric wheels (306) are provided at intervals in the second section of the rotating shaft (304).

7. The pressure ulcer prevention device according to any one of claims 1-6, characterized in that, A linkage component (400) is also provided, which includes: a first connecting plate (401), a second connecting plate (402), a third connecting plate (403), and a rotating shaft (407) disposed on the frame (100). The first connecting plate (401), the second connecting plate (402), and the third connecting plate (403) are respectively located below the first cushion (101) and the second cushion (102). A first positioning frame (404) is provided on one side of the first connecting plate (401), a second positioning frame (405) is provided on one side of the second connecting plate (402), and a third positioning frame (406) is provided on one side of the third connecting plate (403). The lower ends of the first positioning frame (404), the second positioning frame (405), and the third positioning frame (406) are rotatably connected to the rotating shaft (407). A first gear (408), a second gear (409), and a third gear (4010) are sleeved on the rotating shaft (407). The upper end of the first positioning frame (404) is rotatably provided with a first swing rod (4011). The first end of the first swing rod (4011) is rotatably and slidably connected to the side of the first cushion (101). The second end of the first swing rod (4011) is provided with a fourth gear (4014) that is adapted to the first gear (408). The upper end of the second positioning frame (405) is rotatably provided with a second swing rod (4012). The first end of the second swing rod (4012) is rotatably and slidably connected to the side of the first cushion (101). The second end of the second swing rod (4012) is rotatably and slidably connected to the side of the second cushion (102). The middle part of the second swing rod (4012) is provided with a fifth gear (4015) that is adapted to the second gear (409). The upper end of the third positioning frame (406) is rotatably provided with a third swing rod (4013). The first end of the third swing rod (4013) is rotatably and slidably connected to the side of the second cushion (102). The second end of the first swing rod (4011) is provided with a sixth gear (4016) that is adapted to the third gear (4010).

8. The pressure ulcer prevention device according to claim 7, characterized in that, A fixing frame (107) is installed between the first connecting plate (401) and the second connecting plate (402), and between the second connecting plate (402) and the third connecting plate (403). The compression airbag (201) is located inside the fixing frame (107). A positioning plate (108) is provided above the compression airbag (201). The top surface of the positioning plate (108) is correspondingly provided with the first seat cushion (101) and the second seat cushion (102).

9. The pressure ulcer prevention device according to any one of claims 1-6, characterized in that, A serrated guide rod (109) is installed on the frame (100). The outer peripheral sides of both ends of the serrated guide rod (109) are provided with first positioning teeth (1091). A guard plate (110) is slidably arranged on both ends of the serrated guide rod (109). A sliding hook (111) is installed at the bottom of the guard plate (110). A cavity (1111) is provided inside the sliding hook (111). A slider (112) is slidably arranged inside the cavity (1111). 11) has a through groove (1112) on its side that connects to the cavity (1111). One side of the slider (112) extends out of the through groove (1112). The bottom surface of the slider (112) is connected to the bottom surface of the cavity (1111) through a second elastic element (113). A serrated rod (114) is installed on the top surface of the slider (112). The top surface of the serrated rod (114) is provided with a second positioning tooth (1141) that is adapted to the first positioning tooth (1091).

10. The pressure ulcer prevention device according to any one of claims 1-6, characterized in that, A limiting guide rod (115) is installed on the frame (100). A baffle (116) is installed on the top of the limiting guide rod (115). A limiting slide plate (117) is provided on the side of the first cushion (101) and the side of the second cushion (102). A through guide hole (1171) is provided on the surface of the limiting slide plate (117). The limiting guide rod (115) is slidably connected to the guide hole (1171).

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