Anti-bedsore wheelchair

Abstract

The invention discloses an anti-bedsore wheelchair which comprises a wheelchair frame seat, a hip cushion, a leg cushion, a pressure dispersion mechanism, a chain wheel transmission assembly and a backrest. Chair wheels are arranged on the two sides of the wheelchair frame seat; the hip seat cushion, the leg seat cushion and the pressure dispersion mechanism are all mounted on the wheelchair frame seat, the leg seat cushion and the pressure dispersion mechanism are arranged at intervals, and the hip seat cushion, the leg seat cushion and the pressure dispersion mechanism are matched to support a disabled person sitting on the wheelchair; the pressure dispersion mechanism is connected with the chair wheels through a chain wheel transmission assembly; and the backrest is arranged on the wheelchair frame seat. According to the wheelchair, when a person having difficulty in moving sits on the wheelchair, the leg cushion and the pressure dispersion mechanism make contact with the legs of the person having difficulty in moving, the hip cushion makes contact with the hip of the person having difficulty in moving, the legs of the person having difficulty in moving are massaged through the pressure dispersion mechanism, and bedsores (stress point changes) on the legs can be avoided. The pressure dispersion mechanism is powered by the rotating chair wheels, and extra motors and power sources do not need to be arranged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheelchairs, in particular to a pressure sore prevention wheelchair. BACKGROUND

[0002] At present, the disabled, the elderly who rely on wheelchairs for a long time, due to long-term contact with the wheelchair, muscle and skin will gradually appear pathological changes, and are prone to bedsores, which brings great pain and mental burden to patients, the disabled and the elderly, and when the bedsores are serious, it will directly threaten the life of the patient, thus causing inconvenience. The existing wheelchair mainly includes the following types: 1. Wheelchair with massage function: The seat cushion of this wheelchair is usually made of soft and elastic material, and the comfort is improved by inflation. Although it meets the requirement of comfortable sitting, the patient sits on the wheelchair for a long time, and the protruding parts such as hips, sacrum and tail are easily caused by poor blood flow due to long-term compression, which causes bedsores.

[0003] 2. Multi-functional wheelchair for the elderly: The design focus of this wheelchair is adjustability and multi-functionality, including adjustable side handles, leg placement supports, soft seat cushions, etc. These designs aim to improve the comfort and applicability of the wheelchair, but do not have specific functions to prevent bedsores.

[0004] 3. Elderly auxiliary wheelchair with upper limb protection function: The design focus of this wheelchair is upper limb protection and convenience, including a protection assembly for fixing the upper limbs and an arm fixing assembly. Although this design helps to protect the upper limbs of the elderly, it does not directly solve the problem of bedsores. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a pressure sore prevention wheelchair which can be improved from different dimensions to avoid bedsores in people who sit on the wheelchair frequently.

[0006] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows: A pressure sore prevention wheelchair, comprising a wheelchair frame seat, a hip seat cushion, a leg seat cushion, a pressure dispersion mechanism, a chain wheel transmission assembly, and a backrest. Wherein, the wheelchair frame seat is provided with chair wheels on both sides; The hip seat cushion, the leg seat cushion and the pressure dispersion mechanism are all installed on the wheelchair frame seat, and the leg seat cushion and the pressure dispersion mechanism are arranged in a spaced manner. The hip seat cushion, the leg seat cushion and the pressure dispersion mechanism cooperate to support the person who is inconvenient to move and sits on the wheelchair; The pressure dispersion mechanism is connected with the chair wheels through the chain wheel transmission assembly; The backrest is installed on the wheelchair frame seat.

[0007] In the technical scheme, when the person with difficulty in movement sits on the wheelchair, the leg cushion and the pressure dispersion mechanism are in contact with the legs of the person with difficulty in movement, and the hip cushion is in contact with the hips of the person with difficulty in movement, the legs of the person with difficulty in movement are massaged by the pressure dispersion mechanism, and the pressure points of the legs can be changed to avoid bedsores. In addition, the pressure dispersion mechanism is powered by the chair wheels during rotation, and does not need to be equipped with an additional motor and power supply.

[0008] Further, the pressure dispersion mechanism comprises a massage stick and a bearing seat. The leg cushions are provided with mounting grooves between the leg cushions and between the leg cushions and the hip cushion. The massage stick is mounted in the corresponding mounting groove through the bearing seat, and the circumferential surface of the massage stick is provided with a plurality of rows of convex part arrays uniformly distributed and extending along the length direction of the massage stick. The adjacent convex part arrays are arranged in a staggered manner.

[0009] In the technical scheme, the legs are massaged by the convex part arrays arranged in a staggered manner by rotating the massage stick, so that the pressure points of the legs can be changed to avoid bedsores.

[0010] Further, the sprocket transmission assembly comprises a first gear, a second gear, a third gear, a fourth gear, a swing member, a support seat, a rotating shaft, a rotating member, and a first chain. The support seat is fixed to the side surface of the wheelchair frame. The first gear is mounted at both ends of the massage stick. The rotating shaft is rotatably connected to the support seat. The second gear and the rotating member are both sleeved on the rotating shaft, and the rotating member is provided with an auxiliary swing groove. The swing member comprises a connecting column and a swing body. The connecting column is connected to the side surface of the wheelchair frame. The middle part of the swing body is rotatably connected to the connecting column, and both ends are respectively provided with a sector gear engaged with the first gear and an insertion part inserted into the auxiliary swing groove. The third gear is connected to the chair wheel and rotates synchronously with the chair wheel. The fourth gear is rotatably mounted on the wheelchair frame, engaged with the third gear, and connected to the second gear through the first chain.

[0011] In this technical solution, the rotation of the chair wheels (when the anti-bedsore wheelchair is in a walking state) drives the third gear to rotate, which in turn drives the fourth gear to rotate. The fourth gear then drives the second gear to rotate via the first chain. Next, the second gear drives the rotating component to rotate via the rotating shaft. The swinging body uses its connection point with the connecting column as the rotation point. With the cooperation of the auxiliary swinging groove (which causes rotation) and its insertion part of the rotating component, it swings, thereby driving the first gear to rotate back and forth via its sector gear. Finally, the first gear drives the massage stick to rotate.

[0012] Furthermore, the sprocket drive assembly also includes a speed sensor, a controller, and a motor; The motor is mounted on the side of the wheelchair frame and connected to the rotating shaft, which drives the rotating shaft to rotate. The speed sensor is mounted on the axle of the chair wheel; The controller is mounted on the bottom of the wheelchair frame and is electrically connected to the speed sensor and the motor.

[0013] In this technical solution, when the speed sensor detects that the anti-bedsore wheelchair is stationary, the controller controls the motor to work. The motor drives the rotating shaft and rotating parts to rotate. The swinging body takes the connection point with the connecting column as the rotation point. With the cooperation of the auxiliary swinging groove (which rotates) and the plug-in part of the rotating part, it swings, thereby driving the first gear to rotate back and forth through its sector gear. Finally, the massage stick rotates through the first gear.

[0014] In this technical solution, the pressure-dispersing mechanism can be powered while conserving energy as much as possible, regardless of whether the anti-bedsore wheelchair is stationary or moving.

[0015] Furthermore, a fifth gear is provided on the inner side of the chair wheel; The wheelchair frame is equipped with armrests on both sides, and the armrests have ventilation holes; A fan is installed inside the ventilation hole; The fan is connected to the fifth gear via a second chain.

[0016] In this technical solution, the rotating chair wheels can also drive the fan to rotate, thereby promoting air circulation above the buttocks cushion without the need for an additional motor, reducing the chance of bedsore infection.

[0017] Furthermore, the leg cushion is an airbag cushion, and an air inlet pump and an air outlet pump are provided on both sides of the airbag cushion. Both the air inlet pump and the air outlet pump are electrically connected to the controller.

[0018] In this technical solution, compared to a hard seat cushion, using an air-cushioned seat cushion can prevent excessive local pressure when the legs are pressed on the seat cushion, thus reducing the chance of bedsore infection on the legs.

[0019] Furthermore, the upper corners of the leg cushion are all rounded.

[0020] In this technical solution, rounded corners, compared to right angles, can improve the comfort of people with mobility impairments sitting on the airbag seat. In addition, they can make it easier for the pressure distribution mechanism to come into contact with the legs, thus improving the massage effect.

[0021] Furthermore, the bottom of the buttock cushion is provided with a force adjustment mechanism; The force adjustment mechanism includes a support frame, a guide member, a tension spring, a first return spring, a support rod, and a slider. The support frame is mounted on the wheelchair frame seat; The bottom side of the buttock cushion is rotatably connected to the support frame; One end of the guide is connected to the support frame, and the other end is connected to the wheelchair frame. Both the tension spring and the slider are sleeved on the guide member, with one end of the tension spring connected to the support frame and the other end connected to the slider. The support rod is L-shaped, with one end rotatably connected to the bottom of the buttock cushion and the other end connected to a slider. The first reset spring is sleeved on the end where the support rod connects to the slider.

[0022] In this technical solution, when a person with limited mobility sits on the buttock cushion (with their buttocks in close contact with the cushion), the cushion maintains a horizontal position under the force of the buttocks. The slider slides to the end of the guide away from the support frame, pulling the tension spring to its maximum length. If the person with limited mobility sits for an extended period, they can slightly sit up by holding onto the armrests on both sides. At this time, the buttock cushion, having lost the force of the buttocks, will rotate under the action of the tension spring and the first return spring, ensuring that a small portion of the cushion remains in contact with the buttocks. This provides some support for the person with limited mobility when they slightly sit up, while also facilitating air circulation on the upper surface of the cushion.

[0023] Furthermore, the upper surface of the buttock cushion is wavy, which can prevent excessive local pressure when the buttocks are pressed on the buttock cushion, reducing the chance of bedsore infection.

[0024] Furthermore, it also includes an angle adjustment mechanism for adjusting the backrest angle; The angle adjustment mechanism includes a sleeve, a locking block, an auxiliary spring, an adjustment handle, a connecting piece, and a second reset spring; The wheelchair frame is provided with auxiliary protrusions and grooves on the structure between the wheels, and the sleeve and the second return spring are both sleeved on the structure between the wheels. One end of the second return spring is connected to one end of the sleeve, and the other end of the second return spring is connected to the auxiliary protrusion; The inner side of the sleeve is provided with a circumferentially evenly distributed locating groove whose width is adapted to the thickness of the locating block. The auxiliary spring is installed in the groove; The locking block is placed in a space consisting of a groove and different locking slots, and is connected between the auxiliary spring and the adjusting handle; One end of the connector is connected to the sleeve, and the other end is connected to the backrest.

[0025] In this technical solution, the angle of the backrest is adjusted by an angle adjustment mechanism, thereby adjusting the posture of the person with limited mobility when leaning against the backrest, and finally achieving the purpose of adjusting the pressure point to avoid bedsores on the legs and buttocks.

[0026] The principle behind the angle adjustment mechanism for adjusting the backrest tilt angle is as follows: By adjusting the handle, the locking block is moved into the groove. After the locking block disengages from the locking slot, the angle of the sleeve is manually rotated to adjust the backrest angle. After adjustment, the adjusting handle is no longer pushed, and the locking block, under the action of the auxiliary spring, moves out of the groove and inserts into the aligned locking slot, thus fixing the position of the backrest after angle adjustment. During the adjustment process, the second return spring is used to prevent the sleeve from rotating too much.

[0027] Compared with existing technologies, the principles and advantages of this technical solution are as follows: When a person with limited mobility is seated in a wheelchair, the leg cushion and pressure-distributing mechanism contact the person's legs, while the hip cushion contacts the person's buttocks. The pressure-distributing mechanism massages the person's legs, preventing bedsores (due to the constantly changing pressure points). Furthermore, the pressure-distributing mechanism is powered by the rotating wheels, eliminating the need for an additional motor and power supply.

[0028] When the speed sensor detects that the anti-bedsore wheelchair is stationary, the controller activates the motor. The motor drives the rotating shaft and rotating components to rotate. The swinging body, with its connection point with the connecting column as the rotation point, swings in conjunction with the auxiliary swing groove (which rotates) and its insertion part. This, in turn, drives the first gear to rotate back and forth via its sector gear, which in turn drives the massage roller to rotate. In this technical solution, regardless of whether the anti-bedsore wheelchair is stationary or moving, power can be provided to the pressure distribution mechanism while minimizing energy consumption.

[0029] The rotating chair wheels drive the fan, which promotes airflow over the buttocks without the need for an additional motor, reducing the chance of bedsore infection.

[0030] When a person with mobility impairment sits on the buttocks cushion (with their buttocks in close contact with the cushion), the cushion maintains a horizontal position under the force of the buttocks. The slider slides to the end of the guide away from the support frame, extending the tension spring to its maximum length. If the person with mobility impairment has been sitting for a long time, they can hold onto the armrests on both sides and slightly sit up. At this time, the buttocks cushion, having lost the force of the buttocks, will rotate under the action of the tension spring and the first return spring, ensuring that a small portion of the cushion remains in contact with the buttocks. This provides some support for the person with mobility impairment to sit up slightly while also facilitating air circulation on the upper surface of the cushion.

[0031] The angle adjustment mechanism allows for adjustment of the backrest's tilt angle, thereby adjusting the posture of people with mobility impairments when leaning against the backrest, ultimately adjusting the pressure point and preventing bedsores on the legs and buttocks. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those who are not skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is one of the structural schematic diagrams of an anti-bedsore wheelchair according to an embodiment of the present invention; Figure 2 This is a second schematic diagram of the structure of an anti-bedsore wheelchair according to an embodiment of the present invention; Figure 3 This is one of the structural schematic diagrams of an anti-bedsore wheelchair according to an embodiment of the present invention, omitting the armrest and wheel on one side (bearing seat omitted). Figure 4 This is a second schematic diagram of the structure of an anti-bedsore wheelchair according to an embodiment of the present invention, omitting the armrest and wheel on one side (the bearing seat and the first chain are omitted). Figure 5 for Figure 3 Enlarged view of a portion at point A (bearing housing omitted); Figure 6 for Figure 2 A magnified view of a section at point B in the middle; Figure 7 for Figure 6 The structural diagram after the positioning block is omitted; Figure 8 for Figure 4 A magnified view of a section at point C.

[0034] Figure label: 1-Wheelchair frame; 2-Seat cushion; 3-Leg cushion; 4-Backrest; 5-Wheel wheel; 6-Massage stick; 7-Array of protrusions; 8-First gear; 9-Second gear; 10-Third gear; 11-Fourth gear; 12-Swinging component; 13-Support base; 14-Rotating shaft; 15-Rotating component; 16-First chain; 17-Motor; 18-Fifth gear; 19-Armrest; 20-Fan; 21-Second chain; 22-Support frame; 23-Guide component; 24-Tension spring; 25-First return spring; 26-Support rod; 27-Slider; 28-Sleeve; 29-Locking block; 30-Auxiliary spring; 31-Adjusting handle; 32-Connector; 33-Second return spring; 34-Auxiliary protrusion; 35-Groove; 36-Locking slot. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments: like Figures 1 to 8 As shown, the anti-bedsore wheelchair described in this embodiment includes a wheelchair frame 1, a buttock cushion 2, a leg cushion 3, a pressure dispersion mechanism, a sprocket drive assembly, and a backrest 4.

[0036] The wheelchair frame 1 has wheels 5 on both sides; the hip cushion 2, leg cushion 3, and pressure distribution mechanism are all installed on the wheelchair frame 1, and the leg cushion 3 and pressure distribution mechanism are spaced apart. The hip cushion 2, leg cushion 3, and pressure distribution mechanism work together to support the person with mobility impairment sitting in the wheelchair; the pressure distribution mechanism is connected to the wheels 5 through a sprocket drive assembly; and the backrest 4 is installed on the wheelchair frame 1.

[0037] Specifically, in this embodiment, the pressure dispersion mechanism includes a massage stick 6 and a bearing seat; mounting grooves are provided between the leg cushions 3 and between the leg cushions 3 and the buttock cushion 2; the massage stick 6 is installed in the corresponding mounting groove through the bearing seat, and the circumferential surface of the massage stick 6 is provided with multiple rows of evenly distributed protrusions 7 extending along the length direction of the massage stick 6; adjacent protrusion arrays 7 are staggered.

[0038] Specifically, in this embodiment, the sprocket drive assembly includes a first gear 8, a second gear 9, a third gear 10, a fourth gear 11, a swing member 12, a support base 13, a rotating shaft 14, a rotating member 15, and a first chain 16. The support base 13 is fixed to the side of the wheelchair frame 1. The first gear 8 is installed at both ends of the massage stick 6. The rotating shaft 14 is rotatably connected to the support base 13. The second gear 9 and the rotating member 15 are both sleeved on the rotating shaft 14, and the rotating member 15 is provided with an auxiliary swing groove. The swing member 12 includes a connecting column and a swing body. The connecting column is connected to the side of the wheelchair frame 1. The middle part of the swing body is rotatably connected to the connecting column, and both ends are respectively provided with a sector gear that meshes with the first gear 8 and a plug-in part that inserts into the auxiliary swing groove. The third gear 10 is connected to the chair wheel 5 and rotates synchronously with the chair wheel 5. The fourth gear 11 is rotatably installed on the wheelchair frame 1, meshes with the third gear 10, and is connected to the second gear 9 through the first chain 16.

[0039] Specifically, in this embodiment, the sprocket drive assembly also includes a speed sensor, a controller, and a motor 17; The motor 17 is mounted on the side of the wheelchair frame 1 and connected to the rotating shaft 14, driving the rotating shaft 14 to rotate; the speed sensor is mounted on the rotating shaft of the wheelchair wheel 5; the controller is mounted on the bottom of the wheelchair frame 1 and is electrically connected to the speed sensor and the motor 17.

[0040] Specifically, in this embodiment, the inner side of the wheelchair 5 is provided with a fifth gear 18; the two sides of the wheelchair frame 1 are provided with armrests 19, and the armrests 19 have ventilation holes; a fan 20 is provided in the ventilation holes; the fan 20 is connected to the fifth gear 18 through a second chain 21.

[0041] Specifically, in this embodiment, the leg cushion 3 is an airbag cushion. The airbag cushion has an inlet pump and an outlet pump on both sides, both of which are electrically connected to a controller. The controller controls the inlet pump to inflate the airbag cushion; the controller also controls the outlet pump to adjust the amount of air in the airbag cushion according to the weight of the user. The upper corners of the leg cushion 3 are rounded.

[0042] Specifically, in this embodiment, the upper surface of the buttock cushion 2 is wavy, and the bottom of the buttock cushion 2 is provided with a force adjustment mechanism; wherein, the force adjustment mechanism includes a support frame 22, a guide member 23, a tension spring 24, a first return spring 25, a support rod 26, and a slider 27; the support frame 22 is mounted on the wheelchair frame 1; one side of the bottom of the buttock cushion 2 is rotatably connected to the support frame 22; one end of the guide member 23 is connected to the support frame 22, and the other end is connected to the wheelchair frame 1; the tension spring 24 and the slider 27 are both sleeved on the guide member 23, and one end of the tension spring 24 is connected to the support frame 22, and the other end is connected to the slider 27; the support rod 26 is L-shaped, one end of which is rotatably connected to the bottom of the buttock cushion 2, and the other end is connected to the slider 27; the first return spring 25 is sleeved on the end of the support rod 26 connected to the slider 27.

[0043] Specifically, in this embodiment, an angle adjustment mechanism for adjusting the angle of the backrest 4 is also included. The angle adjustment mechanism includes a sleeve 28, a locking block 29, an auxiliary spring 30, an adjustment handle 31, a connector 32, and a second return spring 33. The structure of the wheelchair frame 1 located between the wheels 5 is provided with an auxiliary protrusion 34 and a groove 35. The sleeve 28 and the second return spring 33 are both sleeved on the structure of the wheelchair frame 1 located between the wheels 5. One end of the second return spring 33 is connected to one end of the sleeve 28, and the other end of the second return spring 33 is connected to the auxiliary protrusion 34. The inner side of the sleeve 28 is provided with locking grooves 36 that are evenly distributed in a circle and whose width matches the thickness of the locking block 29. The auxiliary spring 30 is installed in the groove 35. The locking block 29 is placed in the space formed by the groove 35 and the different locking grooves 36, and is connected between the auxiliary spring 30 and the adjustment handle 31. One end of the connector 32 is connected to the sleeve 28, and the other end is connected to the backrest 4.

[0044] The working principle of this embodiment is as follows: When a person with limited mobility is seated in a wheelchair, the leg cushion 3 and pressure distribution mechanism contact the person's legs, and the hip cushion 2 contacts the person's hips. The pressure distribution mechanism massages the person's legs, preventing bedsores (due to the constantly changing pressure points). In addition, the pressure distribution mechanism is powered by the rotating wheelchair wheels 5, eliminating the need for an additional motor and power supply.

[0045] The massage principle of the pressure dispersion mechanism is as follows: by rotating the massage stick 6, the legs are massaged by the staggered array of protrusions 7, which makes the pressure points on the legs constantly change, thereby avoiding bedsores.

[0046] The principle by which the rotating wheel 5 provides power to the pressure dispersion mechanism is as follows: the rotation of the wheel 5 (when the anti-bedsore wheelchair is in the walking state) drives the third gear 10 to rotate, the third gear 10 then drives the fourth gear 11 to rotate, and the fourth gear 11 then drives the second gear 9 to rotate through the first chain 16. Next, the second gear 9 drives the rotating component 15 to rotate through the rotating shaft 14. The swinging body uses its connection point with the connecting column as the rotation point. With the cooperation of the auxiliary swinging groove (which causes rotation) and its insertion part of the rotating component 15, it swings, thereby driving the first gear 8 to rotate back and forth through its sector gear. Finally, the massage stick 6 is driven to rotate through the first gear 8.

[0047] When the speed sensor detects that the anti-bedsore wheelchair is stationary, the controller controls the motor 17 to work. The motor 17 drives the rotating shaft 14 and the rotating component 15 to rotate. The swing body takes the connection point with the connecting column as the rotation point. With the cooperation of the auxiliary swing groove (which rotates) and the plug part of the rotating component 15, it swings, thereby driving the first gear 8 to rotate back and forth through its sector gear. Finally, the massage stick 6 is driven to rotate through the first gear 8.

[0048] In this embodiment, the pressure-dispersing mechanism can be powered whether the anti-bedsore wheelchair is stationary or moving, while saving energy as much as possible.

[0049] Similarly, with the cooperation of the fifth gear 18 and the second chain 21, the rotating chair wheel 5 can drive the fan 20 to rotate, thereby promoting air circulation above the buttock cushion 2 without the need for an additional motor 17, and reducing the chance of bedsore infection.

[0050] Compared to a hard seat cushion, the air-cushioned seat cushion used in this embodiment can prevent excessive local pressure when the legs are pressed on the seat cushion, which can reduce the chance of bedsore infection on the legs.

[0051] Compared to right angles, the upper corners of the leg seat 3 are all rounded, which can improve the comfort of people with mobility impairments sitting on the airbag seat. In addition, it can make the pressure distribution mechanism more likely to come into contact with the legs, thus improving the massage effect.

[0052] When a person with limited mobility sits on the buttock cushion 2 (with their buttocks in close contact with the cushion 2), the cushion 2 maintains a horizontal position under the force of the buttocks. The slider 27 slides to the end of the guide 23 away from the support frame 22, pulling the tension spring 24 to its maximum length. If the person with limited mobility sits for a long time, they can hold onto the armrests 19 on both sides and sit up slightly. At this time, the buttock cushion 2 loses the force of the buttocks and will rotate under the action of the tension spring 24 and the first return spring 25, so that a small part of the cushion 2 still contacts the buttocks. This provides some support for the person with limited mobility to sit up slightly while facilitating air circulation on the upper surface of the cushion 2.

[0053] Finally, this embodiment adjusts the tilt angle of the backrest 4 through the angle adjustment mechanism, thereby adjusting the posture of the person with mobility impairment when leaning against the backrest 4, and finally achieving the purpose of adjusting the pressure point to avoid bedsores on the legs and buttocks.

[0054] The principle behind the angle adjustment mechanism for adjusting the tilt angle of the backrest is as follows: By adjusting the handle 31, the locking block 29 is pushed into the groove 35. After the locking block 29 disengages from the locking slot 36, the angle of the sleeve 28 is manually rotated to adjust the angle of the backrest 4. After adjustment, the adjusting handle 31 stops pushing the locking block 29. Under the action of the auxiliary spring 30, the locking block 29 moves out of the groove 35 and inserts into the aligned locking slot 36, thereby fixing the position of the backrest 4 after angle adjustment. During the adjustment process, the second return spring 33 is used to prevent the sleeve 28 from rotating too much.

[0055] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, any changes made in accordance with the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A wheelchair designed to prevent bedsores, characterized in that, Includes wheelchair frame, hip cushion, leg cushion, pressure distribution mechanism, sprocket drive assembly, and backrest; The wheelchair frame is equipped with wheels on both sides; The hip cushion, leg cushion, and pressure distribution mechanism are all installed on the wheelchair frame, and the leg cushion and pressure distribution mechanism are arranged at intervals. The hip cushion, leg cushion, and pressure distribution mechanism work together to support the person with limited mobility who is sitting in the wheelchair. The pressure dispersion mechanism is connected to the chair wheel via a sprocket drive assembly; The backrest is mounted on the wheelchair frame.

2. The anti-bedsore wheelchair according to claim 1, characterized in that, The pressure dispersion mechanism includes a massage roller and a bearing seat; Mounting grooves are provided between the leg cushions and between the leg cushion and the buttock cushion; The massage stick is installed in the corresponding mounting slot through a bearing seat, and the circumferential surface of the massage stick is provided with multiple rows of evenly distributed protrusions extending along the length of the massage stick. The adjacent arrays of protrusions are staggered.

3. The anti-bedsore wheelchair according to claim 2, characterized in that, The sprocket drive assembly includes a first gear, a second gear, a third gear, a fourth gear, a swing element, a support base, a rotating shaft, a rotating element, and a first chain; The support base is fixed to the side of the wheelchair frame; The first gear is installed at both ends of the massage stick; The rotating shaft is rotatably connected to the support base; The second gear and the rotating component are both sleeved on the rotating shaft, and the rotating component is provided with an auxiliary swing groove; The swing component includes a connecting column and a swing body; The connecting column is connected to the side of the wheelchair frame; The middle part of the swing body is rotatably connected to the connecting column, and both ends are respectively provided with a sector gear that meshes with the first gear and a plug-in part that is inserted into the auxiliary swing groove; The third gear is connected to the chair wheel and rotates synchronously with the chair wheel; The fourth gear is rotatably mounted on the wheelchair frame, meshes with the third gear, and is connected to the second gear via the first chain.

4. The anti-bedsore wheelchair according to claim 3, characterized in that, The sprocket drive assembly also includes a speed sensor, a controller, and a motor; The motor is mounted on the side of the wheelchair frame and connected to the rotating shaft, which drives the rotating shaft to rotate. The speed sensor is mounted on the axle of the chair wheel; The controller is mounted on the bottom of the wheelchair frame and is electrically connected to the speed sensor and the motor.

5. The anti-bedsore wheelchair according to claim 3, characterized in that, The inner side of the chair wheel is provided with a fifth gear; The wheelchair frame is equipped with armrests on both sides, and the armrests have ventilation holes; A fan is installed inside the ventilation hole; The fan is connected to the fifth gear via a second chain.

6. The anti-bedsore wheelchair according to claim 4, characterized in that, The leg seat is an airbag seat, and an air inlet pump and an air outlet pump are provided on both sides of the airbag seat. Both the air inlet pump and the air outlet pump are electrically connected to the controller.

7. The anti-bedsore wheelchair according to claim 6, characterized in that, The upper corners of the leg cushions are all rounded.

8. The anti-bedsore wheelchair according to claim 5, characterized in that, The bottom of the buttock cushion is equipped with a force adjustment mechanism; The force adjustment mechanism includes a support frame, a guide member, a tension spring, a first return spring, a support rod, and a slider. The support frame is mounted on the wheelchair frame seat; The bottom side of the buttock cushion is rotatably connected to the support frame; One end of the guide is connected to the support frame, and the other end is connected to the wheelchair frame. Both the tension spring and the slider are sleeved on the guide member, with one end of the tension spring connected to the support frame and the other end connected to the slider. The support rod is L-shaped, with one end rotatably connected to the bottom of the buttock cushion and the other end connected to a slider. The first reset spring is sleeved on the end where the support rod connects to the slider.

9. A pressure-resistant wheelchair according to claim 8, characterized in that, The upper surface of the buttock cushion is wavy.

10. A pressure-resistant wheelchair according to claim 1, characterized in that, It also includes an angle adjustment mechanism for adjusting the backrest angle; The angle adjustment mechanism includes a sleeve, a locking block, an auxiliary spring, an adjustment handle, a connecting piece, and a second reset spring; The wheelchair frame is provided with auxiliary protrusions and grooves on the structure between the wheels, and the sleeve and the second return spring are both sleeved on the structure between the wheels. One end of the second return spring is connected to one end of the sleeve, and the other end of the second return spring is connected to the auxiliary protrusion; The inner side of the sleeve is provided with a circumferentially evenly distributed locating groove whose width is adapted to the thickness of the locating block. The auxiliary spring is installed in the groove; The locking block is placed in a space consisting of a groove and different locking slots, and is connected between the auxiliary spring and the adjusting handle; One end of the connector is connected to the sleeve, and the other end is connected to the backrest.

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