Pressure sore prevention type orthopedic lower limb lifting auxiliary device

Abstract

The invention relates to the technical field of correction instruments, in particular to a pressure sore prevention type orthopedic lower limb lifting auxiliary device which comprises a base with a slope, a first traction frame is rotationally connected to the outer wall of the slope of the base, and a second traction frame is rotationally connected to the end wall of the end, away from the base, of the first traction frame. A guide groove is formed in the outer wall of the end, close to the first traction frame, of the second traction frame. Through the arranged pressure sore prevention mechanism, after a detection value reaches a threshold value and lasts for a period of time, a pressure sensor drives a second electric push rod to stretch or contract through a controller signal, so that the second electric push rod pushes a floating frame to slide along a second traction frame, and the floating frame drives a roller airbag to move synchronously; therefore, the contact part of the roller air bag and the shank of the patient is changed, the effect of monitoring the pressed area of the lower limb of the patient in real time is achieved, active intervention is conducted by changing the pressed position, and the pressure sore prevention effect is further improved.

Description

Technical Field

[0001] This invention relates to the field of orthopedic devices, and more particularly to an orthopedic lower limb elevation assistive device for preventing pressure sores. Background Technology

[0002] Postoperative lower limb orthopedic patients often need to use orthotics to fix the lower limbs and elevate the affected limbs to promote venous return, reduce swelling and pain, and create favorable conditions for tissue repair. Due to prolonged bed rest, the lower limbs are prone to continuous pressure, leading to local blood circulation disorders and pressure sores. Once this condition occurs, it not only aggravates the patient's pain but may also cause complications such as infection and osteomyelitis, prolonging the recovery period and increasing the medical burden. Currently, existing technology generally uses orthotics with adjustable angles to change the force state of the lower limbs, thereby achieving the effect of preventing pressure sores. However, in actual use, the weight of the lower limbs is entirely supported by the orthosis, which causes the supporting part of the orthosis to exert counter-pressure on the lower limbs. Although raising the orthosis at different angles changes the magnitude of the force between the lower limbs and the contact surface, the contact position between the lower limbs and the orthosis does not change. This results in the lower limbs and the contact area with the orthosis still being under continuous pressure, affecting local blood circulation in the lower limbs and making the prevention of pressure sores insignificant. In particular, the popliteal fossa area behind the knee is a high-risk area for pressure sores because it contains a large number of blood vessels and nerves in its subcutaneous tissue. It is necessary to ensure support while avoiding areas with concentrated blood vessels. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing an anti-pressure ulcer orthopedic lower limb elevation assistive device. This invention, through its anti-pressure ulcer mechanism, ensures that when the detected value reaches a threshold and remains there for a period of time, the pressure sensor drives a second electric push rod to extend or retract via a controller signal. This causes the second electric push rod to push a floating frame to slide along a second traction frame. The floating frame then moves the roller airbag synchronously, thereby changing the contact point between the roller airbag and the patient's lower leg. This achieves real-time monitoring of the pressure-bearing area of ​​the patient's lower limb and, by actively intervening by changing the pressure position, further improves the pressure ulcer prevention effect.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a pressure-ulcer-preventing orthopedic lower limb elevation assistive device, comprising a base with a ramp, a first traction frame rotatably connected to the outer wall of the ramp of the base, a second traction frame rotatably connected to the end wall of the first traction frame away from the base, a guide groove being formed on the outer wall of the second traction frame near the first traction frame, and a pair of splints for auxiliary correction rotatably connected to the upper outer wall of the second traction frame; the base is provided with an pressure-ulcer prevention mechanism and an angle adjustment mechanism, the pressure-ulcer prevention mechanism including an airbag pressure pad fixed in the guide groove. A floating frame is slidably inserted into the outer wall of the second traction frame. A second electric push rod is installed on the outer wall of the second traction frame. The output end of the second electric push rod is fixed to the outer wall of the floating frame. A mounting frame is slidably connected inside the floating frame. A pressure sensor is fixed on the bottom inner wall of the floating frame. The sensing surface of the pressure sensor is fixed on the bottom outer wall of the mounting frame. The pressure sensor is electrically connected to the second electric push rod through a controller signal. A truss for adjusting the expansion degree of the airbag pressure pad is provided on the outer wall of the floating frame. Several roller airbags are rotatably connected to the outer wall of the mounting frame.

[0005] Preferably, the angle adjustment mechanism includes a first electric push rod rotatably connected to the outer wall of the base, the output end of the first electric push rod being rotatably connected to the bottom outer wall of the first traction frame, a gear being fixed on the outer wall of the second traction frame around the rotation center of the first traction frame, and meshing teeth that mesh with the gear being provided on the outer wall of the base.

[0006] Preferably, the outer walls of both the clamp and the first traction frame are provided with straps for fixing the lower limbs.

[0007] Preferably, a pressing block is slidably inserted into the guide groove, and an inclined block located outside the guide groove is provided on the bottom outer wall of the pressing block. The end of the truss away from the second traction frame is rotatably connected to a pulley that abuts against the inclined block.

[0008] Preferably, a spring is provided between the outer wall of the extrusion block and the inner wall of the guide groove, a stop bar is fixed on the inner wall of the opening of the guide groove, and the area of ​​the airbag pressure pad extending to the outside of the guide groove is divided in two by the stop bar.

[0009] Preferably, the outer wall of the mounting frame is provided with several pairs of fixed shafts, and an auxiliary support plate is provided between the end walls of each pair of fixed shafts.

[0010] Preferably, the two ends of the roller airbag are rotatably sleeved on the outer wall of the fixed shaft, and the roller airbag is wrapped around the outside of the auxiliary support plate.

[0011] Preferably, a limiting groove is formed on the outer wall of the second traction frame along the long side, and a slider is provided on the outer wall of the floating frame that slides into the limiting groove.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention, through the design of an anti-pressure ulcer mechanism, enables the pressure sensor to extend or retract a second electric push rod via a controller signal when the detected value reaches a threshold and remains there for a period of time. This causes the second electric push rod to push a floating frame to slide along a second traction frame, and the floating frame to move the roller airbag synchronously. This changes the contact point between the roller airbag and the patient's lower leg, achieving real-time monitoring of the pressure area on the patient's lower limbs. Furthermore, by actively intervening by changing the pressure position, the invention further improves the pressure ulcer prevention effect.

[0013] 2. This invention utilizes an airbag pressure pad. Whenever the second electric pusher moves the floating frame away from the airbag pressure pad, the floating frame causes the roller airbag to move away from the lower limb's center of gravity. The floating frame also moves the truss synchronously, causing the pulleys on the truss to contact the inclined blocks and continue pushing the inclined blocks upwards. This causes the pulleys to push the compression blocks upwards, further inflating the airbag pressure pad. This effectively distributes the patient's lower limb weight onto the airbag pressure pad and the roller airbag, helping to maintain postural stability and further preventing pressure sores. Whenever the second electric pusher moves the floating frame away from the airbag pressure pad... When the airbag slides closer to the side of the pressure pad, the floating frame moves the roller airbag closer to the center of gravity of the lower limb, and the pulley separates from the compression block again. Under the action of the spring, the compression block moves away from the airbag pressure pad, thereby reducing the support force of the airbag pressure pad on the popliteal fossa area, thus reducing the pressure on the popliteal fossa and further preventing the formation of pressure sores in the popliteal fossa. By adjusting the degree of expansion of the airbag pressure pad, the stress state of the popliteal fossa is changed, preventing the popliteal fossa from being compressed for a long time and forming pressure sores. At the same time, it also prevents the popliteal fossa from being directly suspended, which would cause the lower limb to be unstable and the knee joint to be forced into a near fully extended position.

[0014] 3. The present invention, through the angle adjustment mechanism, controls the extension of the first electric push rod when it is necessary to further elevate the patient's lower limb. This causes the first electric push rod to push the first traction frame to flip upward. The first traction frame drives the second traction frame to move synchronously. Under the meshing action of gears and meshing teeth, the second traction frame flips downward relative to the first traction frame. This causes the second traction frame to drive the lower leg held by the splint to rotate downward, thereby causing the patient's knee to flex slightly. This relieves the local pressure on the blood vessels and nerves in the popliteal fossa, while avoiding excessive traction on the muscles on the back of the lower leg, which could lead to traction on the wound. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 1 ; Figure 2 This is a three-dimensional sectional view of the overall structure proposed in this invention. Figure 1 ; Figure 3 This is a three-dimensional sectional view of the overall structure proposed in this invention. Figure 2 ; Figure 4 This is a three-dimensional schematic diagram of the overall structure proposed in this invention. Figure 2 ; Figure 5 This is a three-dimensional schematic diagram of the first traction frame proposed in this invention; Figure 6 This is a three-dimensional schematic diagram of the pressure ulcer prevention mechanism proposed in this invention; Figure 7 This is a three-dimensional cross-sectional view of the guide groove proposed in this invention; Figure 8 This is a three-dimensional schematic diagram of the floating frame proposed in this invention; Figure 9 This is a three-dimensional cross-sectional view of the roller airbag proposed in this invention.

[0016] Legend: 1. Base; 11. First electric push rod; 12. First traction frame; 13. Strap; 14. Meshing teeth; 2. Second traction frame; 21. Gear; 22. Guide groove; 221. Stop bar; 23. Airbag pressure pad; 24. Clamping plate; 25. Limiting groove; 3. Extrusion block; 31. Spring; 32. Inclined block; 4. Floating frame; 41. Second electric push rod; 42. Mounting frame; 43. Pressure sensor; 44. Auxiliary support plate; 441. Fixed shaft; 45. Roller airbag; 46. Truss; 461. Pulley; 47. Slider. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] See Figures 1 to 9 As shown, an anti-pressure ulcer orthopedic lower limb elevation assist device includes a base 1 with a ramp, a first traction frame 12 is rotatably connected to the outer wall of the ramp of the base 1, a second traction frame 2 is rotatably connected to the end wall of the first traction frame 12 away from the base 1, a guide groove 22 is provided on the outer wall of the end of the second traction frame 2 close to the first traction frame 12, and an anti-pressure ulcer mechanism and an angle adjustment mechanism are provided on the base 1. The pressure ulcer prevention mechanism includes an airbag pressure pad 23 fixed in a guide groove 22, a floating frame 4 slidably inserted into the outer wall of a second traction frame 2, a second electric push rod 41 mounted on the outer wall of the second traction frame 2, the output end of the second electric push rod 41 fixed to the outer wall of the floating frame 4, a mounting frame 42 slidably connected inside the floating frame 4, a pressure sensor 43 fixed on the bottom inner wall of the floating frame 4, the sensing surface of the pressure sensor 43 fixed on the bottom outer wall of the mounting frame 42, the pressure sensor 43 electrically connected to the second electric push rod 41 via a controller signal, a truss 46 for adjusting the expansion degree of the airbag pressure pad 23 provided on the outer wall of the floating frame 4, several roller airbags 45 rotatably connected to the outer wall of the mounting frame 42, a compression block 3 slidably inserted into the guide groove 22, and a compression block 3 with a pressure sensor 45 located on the bottom outer wall of the compression block 3. The inclined block 32 on the outside of the guide groove 22, the end of the truss 46 away from the second traction frame 2 is rotatably connected to the pulley 461 that abuts against the inclined block 32, the outer wall of the extrusion block 3 is provided with a spring 31 between the outer wall of the extrusion block 3 and the inner wall of the guide groove 22, the inner wall of the opening of the guide groove 22 is fixed with a stop bar 221, the area of ​​the airbag pressure pad 23 extending to the outside of the guide groove 22 is divided in two by the stop bar 221, the outer wall of the mounting frame 42 is provided with several pairs of fixed shafts 441, the end walls of each pair of fixed shafts 441 are provided with an auxiliary support plate 44, the two ends of the roller airbag 45 are rotatably sleeved on the outer wall of the fixed shafts 441, the roller airbag 45 is wrapped around the outside of the auxiliary support plate 44, the outer wall of the second traction frame 2 is provided with a limit groove 25 along the long side, and the outer wall of the floating frame 4 is provided with a slider 47 that slides into the limit groove 25.

[0019] It should be noted that when the patient's lower leg is fixed on the second traction frame 2, the lower leg area abuts against the roller airbag 45 on the floating frame 4. The roller airbag 45 can conform to the contour of the patient's leg through elastic deformation, increasing the contact area of ​​the lower limb and achieving the effect of dispersing pressure, thereby avoiding the formation of pressure sores. The popliteal fossa area behind the patient's knee abuts against the airbag pressure pad 23, achieving the effect of elastic support for the soft tissue in the popliteal fossa, avoiding the popliteal fossa being directly suspended, which would cause the lower limb to be unstable and the knee joint to be forced to be almost fully extended.

[0020] Pressure sensor 43 detects the pressure on the patient's lower leg. When the detected value reaches a threshold and remains there for a period of time, pressure sensor 43 drives the second electric push rod 41 to extend or retract via a controller signal. This causes the second electric push rod 41 to push the floating frame 4 to slide along the second traction frame 2. The floating frame 4 then moves the roller airbag 45 synchronously, thereby changing the contact area between the roller airbag 45 and the patient's lower leg. This avoids the continuous pressure on the lower limbs in the contact area with the device, which is not effective in preventing pressure ulcers in the prior art. At the same time, it achieves real-time monitoring of the pressure area on the patient's lower limbs and further improves the pressure ulcer prevention effect by actively intervening by changing the pressure position.

[0021] Meanwhile, during the movement of the floating frame 4, the floating frame 4 drives the roller airbag 45 to move synchronously. Since the roller airbag 45 is in close contact with the patient's lower limb, it can achieve the effect of massaging the patient's lower limb, promoting blood circulation, improving the recovery effect. Furthermore, when the friction between the roller airbag 45 and the patient's lower limb is large, the roller airbag 45 can rotate around the fixed axis 441, thereby reducing the tendency of the roller airbag 45 to pull on the patient's lower limb skin when it moves, and avoiding the lower limb wound being pulled.

[0022] Furthermore, when the truss 46 is not in contact with the inclined block 32, the spring 31 is in a naturally contracted state, and the compression block 3 is not in contact with the airbag pressure pad 23. At this time, the airbag pressure pad 23 is in a naturally expanded state and applies less pressure to the popliteal fossa area. Whenever the second electric push rod 41 pushes the floating frame 4 to slide away from the airbag pressure pad 23, the floating frame 4 drives the roller airbag 45 away from the center of gravity of the lower limb. The floating frame 4 drives the truss 46 to move synchronously, so that the pulley 461 on the truss 46 abuts against the inclined block 32. The inclined block 32 continues to move upward, causing the pulley 461 to push the compression block 3 upward. This causes the compression block 3 to further inflate the airbag pressure pad 23, thereby distributing the patient's lower limb weight onto the airbag pressure pad 23 and the roller airbag 45. This helps maintain postural stability and further prevents pressure sores. Whenever the second electric push rod 41 drives the floating frame 4 to slide closer to the airbag pressure pad 23, the floating frame 4 moves the roller airbag 45 closer to the lower limb's center of gravity, and the pulley 461 separates from the compression block 3 again. Under the action of spring 31, the compression block 3 moves away from the airbag pressure pad 23, thereby reducing the support force of the airbag pressure pad 23 on the popliteal fossa area, thus reducing the pressure on the popliteal fossa and further preventing the formation of pressure sores in the popliteal fossa. By adjusting the expansion degree of the airbag pressure pad 23, the stress state of the popliteal fossa is changed, preventing the popliteal fossa from being compressed for a long time and forming pressure sores. It also prevents the popliteal fossa from being directly suspended, which would cause the lower limb to be unstable and the knee joint to be forced into a near-fully extended position. Furthermore, the airbag pressure pad 23 is divided into two by the stop bar 221. This allows the airbag pressure pad 23 to extend towards the inner walls of both sides of the popliteal fossa after being compressed, thus enabling the airbag pressure pad 23 to support the soft tissues on both sides of the popliteal fossa, avoiding the dense area of ​​blood vessels and nerves in the center, further preventing pressure sores and improving the recovery effect. The stop bar 221 can also be set as an inverted cone shape, so that after the airbag pressure pad 23 is compressed, it can extend along the inverted circumference towards the inner walls of the popliteal fossa around the perimeter, further avoiding the central area of ​​the popliteal fossa while increasing the contact area with the popliteal fossa area, avoiding pressure concentration, thereby achieving the effect of relieving pressure.

[0023] In addition, the pressure sensor 43 collects pressure values ​​in real time based on the piezoresistive principle. By setting the sampling frequency, the movement time interval of the floating frame 4 can be controlled, such as detecting the pressure value once every half hour. As long as the detected value reaches the threshold, the second electric push rod 41 will push the floating frame 4 to change its position once. Considering that the detected values ​​of the pressure sensor 43 at different positions and the different weights of the patient's lower limbs will lead to differences, its threshold should be set below the critical pressure value that is prone to causing pressure ulcers. This ensures that the floating frame 4 can trigger the adjustment action at different positions and when detecting patients with lighter weights. The alternating action parameters of the second electric push rod 41 are set, such as the single extension or contraction stroke, alternation cycle, and action speed. The controller analyzes the data of the pressure sensor 43 through the built-in algorithm. When the detected value reaches the preset threshold and the duration reaches the set value duration, it is determined to be a high pressure risk, and the controller immediately outputs the command for the second electric push rod 41 to alternately extend or contract. The second electric push rod 41 can be an XTL100 type DC miniature push rod, which has low noise and does not affect the patient's rest, and has a built-in limit switch to prevent overtravel action.

[0024] The angle adjustment mechanism includes a first electric push rod 11 rotatably connected to the outer wall of the base 1. The output end of the first electric push rod 11 is rotatably connected to the bottom outer wall of the first traction frame 12. A gear 21 is fixed on the outer wall of the second traction frame 2 around the rotation center of the first traction frame 12. The outer wall of the base 1 is provided with meshing teeth 14 that mesh with the gear 21. A pair of splints 24 for auxiliary correction are rotatably connected to the upper outer wall of the second traction frame 2. Both the splints 24 and the outer wall of the first traction frame 12 are provided with straps 13 for fixing the lower limbs.

[0025] It should be noted that the base 1 is provided with a slope at a certain angle. In the initial state, the first electric push rod 11 is in the retracted state. At this time, the first traction frame 12 is flush with the slope of the base 1. At the same time, under the cooperation of the gear 21 and the meshing teeth 14, the second traction frame 2 is also flush with the slope of the base 1.

[0026] The patient's thigh is fixed to the first traction frame 12 by the strap 13, and the patient's lower leg is fixed to the second traction frame 2. The popliteal fossa area behind the patient's knee is in contact with the airbag pressure pad 23. The splint 24 is tightened by the strap 13 to clamp and fix the patient's lower leg. For closed fractures and joint dislocations, after manual reduction, the splint 24 can restrict the rotation of the affected limb through external pressure and support, prevent the fracture ends from shifting and the dislocation from recurring, and allow the bones and joints to heal in the correct alignment. This fixes the patient's lower limb to this device, avoiding the patient's lower limb from shifting and causing secondary injury. In addition, since the first traction frame 12 and the second traction frame 2 are flush with the slope of the base 1 in the initial state, when the patient lies flat, his lower limb is raised by the slope of the base 1 to a position higher than the patient's heart, thereby promoting blood return and facilitating postoperative recovery.

[0027] When it is necessary to further elevate the patient's lower limb, the first electric push rod 11 is extended, causing the first electric push rod 11 to push the first traction frame 12 to rotate upward. The first traction frame 12 drives the second traction frame 2 to move synchronously. Under the meshing action of the gear 21 and the meshing teeth 14, the second traction frame 2 rotates downward relative to the first traction frame 12, thereby causing the second traction frame 2 to drive the lower leg clamped by the splint 24 to rotate downward, thereby causing the patient's knee to be slightly flexed, relieving the local pressure on the blood vessels and nerves in the popliteal fossa, and at the same time avoiding excessive traction on the muscles on the back of the lower leg, which could lead to traction on the wound.

[0028] In addition, the first electric actuator 11 adopts a self-locking actuator, such as the straight electro-hydraulic actuator of the GYTZ series, which integrates a self-locking function. It is suitable for lifting or clamping mechanisms of medical equipment, ensuring that the first traction frame 12 will not fall back when the device is powered off, thus avoiding secondary injury to the patient. Furthermore, the meshing stroke of gear 21 and meshing teeth 14 can be customized according to the actual needs of the customer before leaving the factory. The meshing stroke of gear 21 and meshing teeth 14 can drive gear 21 to rotate the second traction frame 2 within a range of five to ten degrees, thereby controlling the slight flexion angle of the patient's knee to five to ten degrees. This meets the scientific setting required in postoperative care that the knee joint should be kept slightly flexed by five to ten degrees, which is conducive to improving the patient's recovery effect.

[0029] Furthermore, this device can also be used for leg-raising function training, providing rehabilitation training for patients with lower limb muscle imbalances. After the patient lies flat, the thigh is secured to the first traction frame 12 via straps 13, and the lower leg is secured to the second traction frame 2. The first electric push rod 11 extends, pushing the first traction frame 12 upwards, causing it to rotate the thigh upwards. The first traction frame 12 drives the second traction frame 2 to move synchronously. When the meshing stroke of gear 21 and meshing teeth 14 is completed, the second traction frame 2 and the lower leg, under their own weight, lift the leg. The second traction frame 2 is further rotated downward relative to the first traction frame 12 to assist the patient in completing the leg raising and knee flexion movements. During this process, the patient's leg can bend to its limit by naturally hanging down, avoiding secondary injury caused by forced knee flexion. Similarly, when the first electric push rod 11 retracts, the first traction frame 12 moves the thigh down to reset. When the gear 21 and the meshing tooth 14 re-engage, the second traction frame 2 is further rotated upward relative to the first traction frame 12, so that the second traction frame 2 drives the leg to reset and straighten. The above process is repeated to assist the patient in repeatedly performing leg raising, knee flexion and straightening movements, thereby achieving the effect of training the leg muscles.

[0030] Working principle: The patient's thigh is fixed to the first traction frame 12 by the strap 13, and the patient's lower leg is fixed to the second traction frame 2. The lower leg is in contact with the roller airbag 45 on the floating frame 4. At this time, the popliteal fossa area behind the patient's knee is in contact with the airbag pressure pad 23. The patient's lower leg is clamped by tightening the splint 24 by the strap 13, and the patient's lower limb is fixed to this device. Through the above leg fixation process, the patient's thigh, lower leg and popliteal fossa area behind the knee can be supported simultaneously, so that the weight of the leg is distributed to the three areas of the thigh, lower leg and popliteal fossa, thereby reducing the reaction pressure on the leg from the contact surface of the orthosis and avoiding the formation of pressure sores induced by local pressure. Under the action of the angle adjustment mechanism, when it is necessary to further elevate the patient's lower limb, the first electric push rod 11 is extended, so that the first electric push rod 11 pushes the first traction frame 12 to flip upward. The first traction frame 12 drives the second traction frame 2 to move synchronously. Under the meshing action of the gear 21 and the meshing tooth 14, the second traction frame 2 flips downward relative to the first traction frame 12, so that the second traction frame 2 drives the lower leg clamped by the splint 24 to rotate downward, thereby causing the patient's knee to be slightly flexed, relieving the local pressure on the blood vessels and nerves in the popliteal fossa, and at the same time avoiding the excessive traction of the muscles on the back of the lower leg, which could cause the wound to be pulled. Under the action of the pressure ulcer prevention mechanism, the pressure sensor 43 detects the pressure on the patient's lower leg. When the detected value reaches the threshold and continues for a period of time, the pressure sensor 43 drives the second electric push rod 41 to extend or retract through the controller signal. This causes the second electric push rod 41 to push the floating frame 4 to slide along the second traction frame 2. The floating frame 4 drives the roller airbag 45 to move synchronously, thereby changing the contact area between the roller airbag 45 and the patient's lower leg. This avoids the situation in the prior art where the lower limb is continuously under pressure in the contact area with the device, resulting in an insignificant pressure ulcer prevention effect. At the same time, it achieves the effect of real-time monitoring of the pressure area of ​​the patient's lower limb and further improves the pressure ulcer prevention effect by actively intervening by changing the pressure position. Furthermore, when the truss 46 is not in contact with the inclined block 32, the spring 31 is in a naturally contracted state, and the compression block 3 is not in contact with the airbag pressure pad 23. At this time, the airbag pressure pad 23 is in a naturally expanded state and applies less pressure to the popliteal fossa area. Whenever the second electric push rod 41 pushes the floating frame 4 to slide away from the airbag pressure pad 23, the floating frame 4 drives the roller airbag 45 away from the center of gravity of the lower limb. The floating frame 4 drives the truss 46 to move synchronously, so that the pulley 461 on the truss 46 abuts against the inclined block 32 and continues to push the inclined block 32 upward, so that the pulley 461 pushes the compression block 3 upward, thereby the compression block 3 compresses the airbag pressure pad 23 to expand further, thereby distributing the weight of the patient's lower limb to the airbag pressure pad 23 and the roller airbag 45, which is conducive to maintaining body position stability and further avoiding the formation of pressure sores. Whenever the second electric push rod 41 drives the floating frame 4 to slide closer to the airbag pressure pad 23, the floating frame 4 drives the roller airbag 45 closer to the center of gravity of the lower limb, and the pulley 461 separates from the compression block 3 again. Under the action of the spring 31, the compression block 3 moves away from the airbag pressure pad 23, thereby reducing the support force of the airbag pressure pad 23 on the popliteal fossa area, thereby reducing the pressure on the popliteal fossa and further preventing the formation of pressure sores in the popliteal fossa. By adjusting the degree of expansion of the airbag pressure pad 23, the stress state of the popliteal fossa is changed, preventing the popliteal fossa from being compressed for a long time and forming pressure sores. At the same time, it also prevents the popliteal fossa from being directly suspended, which would cause the lower limb to be unsupported and the knee joint to be forced into a near-fully extended position. Furthermore, the airbag pressure pad 23 is divided into two by the stop rod 221, so that the airbag pressure pad 23 is compressed and extends to the inner walls of both sides of the popliteal fossa. This allows the airbag pressure pad 23 to support the soft tissues on both sides of the popliteal fossa, avoiding the dense area of ​​blood vessels and nerves in the center, further preventing pressure sores and improving the recovery effect.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure ulcer prevention type orthopedic lower limb lifting auxiliary device, comprising a base (1) with a slope, characterized in that: a first traction frame (12) is rotatably connected to the outer wall of the slope of the base (1), the end wall of the end of the first traction frame (12) away from the base (1) is rotatably connected with a second traction frame (2), a guide groove (22) is formed in the outer wall of the end of the second traction frame (2) close to the first traction frame (12), a pair of clamps (24) for auxiliary correction is rotatably connected to the upper outer wall of the second traction frame (2), and a pressure ulcer prevention mechanism and an angle adjusting mechanism are arranged on the base (1). The pressure ulcer prevention mechanism comprises an air bag pressure pad (23) fixed in the guide groove (22), a floating frame (4) is slidably inserted into the outer wall of the second traction frame (2), a second electric push rod (41) is installed on the outer wall of the second traction frame (2), the output end of the second electric push rod (41) is fixed to the outer wall of the floating frame (4), an installation frame (42) is slidably connected in the floating frame (4), a pressure sensor (43) is fixed to the bottom inner wall of the floating frame (4), the sensing surface of the pressure sensor (43) is fixed to the bottom outer wall of the installation frame (42), the pressure sensor (43) is electrically connected with the second electric push rod (41) through a controller signal, a truss (46) for adjusting the inflation degree of the air bag pressure pad (23) is arranged on the outer wall of the floating frame (4), and a plurality of roller air bags (45) are rotatably connected to the outer wall of the installation frame (42). The angle adjusting mechanism comprises a first electric push rod (11) rotatably connected to the outer wall of the base (1), the output end of the first electric push rod (11) is rotatably connected to the bottom outer wall of the first traction frame (12), the second traction frame (2) is fixed with a gear (21) on the outer wall of the rotation center of the first traction frame (12), and the outer wall of the base (1) is provided with meshing teeth (14) meshing with the gear (21).

2. The anti-pressure-sore orthopedic lower-limb elevating auxiliary device according to claim 1, characterized in that: The outer walls of the clamps (24) and the first traction frame (12) are provided with a bandage (13) for fixing the lower limbs.

3. The anti-pressure sore type orthopedic lower limb lifting auxiliary device according to claim 1, characterized in that: An extrusion block (3) is slidably inserted into the guide groove (22), an inclined block (32) located outside the guide groove (22) is arranged on the bottom outer wall of the extrusion block (3), a pulley (461) abutting against the inclined block (32) is rotatably connected to the end of the truss (46) away from the second traction frame (2).

4. The anti-pressure-sore orthopedic lower-limb elevating auxiliary device according to claim 3, characterized in that: A spring (31) is arranged between the outer wall of the extrusion block (3) and the inner wall of the guide groove (22), a stop rod (221) is fixed to the inner wall of the opening of the guide groove (22), and the area of the air bag pressure pad (23) extending to the outside of the guide groove (22) is divided by the stop rod (221).

5. The anti-pressure sore type orthopedic lower limb lifting auxiliary device according to claim 4, characterized in that: A plurality of pairs of fixed shafts (441) are arranged on the outer wall of the installation frame (42), and an auxiliary support plate (44) is arranged between the end walls of each pair of fixed shafts (441).

6. The anti-pressure sore type orthopedic lower limb lifting auxiliary device according to claim 1, characterized in that: ​ 7. The anti-pressure sore type orthopedic lower limb lifting auxiliary device according to claim 6, characterized in that: Both ends of the drum air bag (45) are rotatably sleeved on the outer wall of the fixed shaft (441), and the drum air bag (45) is wrapped outside the auxiliary supporting plate (44).

8. The anti-pressure sore type orthopedic lower limb lifting auxiliary device according to claim 1, characterized in that: A limiting groove (25) is formed in the outer wall of the second traction frame (2) along the long edge direction, and the outer wall of the floating frame (4) is provided with a sliding block (47) slidingly inserted into the limiting groove (25).

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