CN114831824A

CN114831824A - Negative pressure air cushion for preventing pressure sores

Info

Publication number: CN114831824A
Application number: CN202210614311.1A
Authority: CN
Inventors: 陈香萍; 陈丽; 郭倩倩; 肖艳萍; 仇秀敏; 劳月文; 张奕
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-08-02
Anticipated expiration: 2042-05-31
Also published as: CN114831824B

Abstract

The invention discloses a negative pressure air cushion for preventing pressure sores, and relates to the technical field of negative pressure air cushions; the inflatable air bag comprises a plurality of air bag bodies, one end of each air bag body is provided with an air nozzle, the air bag bodies are detachably connected with a fixing assembly, any one air bag body is sleeved in an elastic belt, so that the air bag body is convenient to fixedly install, and the plurality of air bag bodies are smoothly installed and are convenient for a patient to use; the two ends of the central plate are rotatably hinged with the two middle side plates, and the two ends of the side plates are rotatably hinged with the two angle plates, so that when the turning plates can smoothly rotate along the fixed plate, and the rotating directions of the two turning plates along the fixed plate are opposite, the moving directions of the upper body and the legs of a patient are opposite; the third motor drives the third worm wheel to rotate through the third worm, so that the third rotating shaft drives the T-shaped plate to rotate, the side plate and the angle plate rotate upwards along the central plate through the T-shaped plate, and then the patient can be assisted to change from lying to lying on one side.

Description

Negative pressure air cushion for preventing pressure sores

Technical Field

The invention relates to the technical field of negative pressure air cushions, in particular to a negative pressure air cushion for preventing pressure sores.

Background

Pressure sores are also called bedsores and pressure ulcers, because partial skin of a body is pressed for a long time, blood circulation is influenced, skin and subcutaneous tissues are lack of nutrition, damage, ulcer and even necrosis occur, the pressure sores are better at pressed bone protruding parts such as sacrococcygeal bones, ankles, heels, buttocks and the like, the positions of patients are continuously moved by families of the patients through the existing preventive measures, the lying postures of the patients are changed, the patients are psychologically born with burden, the existing negative pressure air cushions are single air cushions, the lying postures of the patients can be changed by matching of the families, the use is inconvenient, and the inventor provides the negative pressure air cushion for preventing the pressure sores for solving the problems.

Disclosure of Invention

The problem that the existing negative pressure air cushions are single air cushions, the lying posture of a patient can be changed by matching family members, and the use is inconvenient is solved; the invention aims to provide a negative pressure air cushion for preventing pressure sores.

In order to solve the technical problems, the invention adopts the following technical scheme: the negative pressure air cushion for preventing pressure sores comprises a plurality of air cushion air bags, wherein one end of each air cushion air bag is provided with an air faucet, the air cushion air bags are detachably connected with a fixing assembly, a middle plate assembly is arranged at the bottom end of the fixing assembly and comprises a central plate, a middle side plate, a side plate and an angle plate, a bottom plate assembly is arranged at the bottom end of the middle plate assembly and comprises a fixing plate and a turning plate, a first adjusting device, a limiting device and a power-assisted turnover device are arranged in the bottom plate assembly, the first adjusting device is in transmission connection with the turning plate, the power-assisted turnover device is in transmission connection with the side plate, the air cushion air bags are flatly installed through the fixing assembly, when the negative pressure air cushion is used, the bottom plate assembly can realize the rotation adjustment of the fixing plate and the turning plate through the first adjusting device, and the power-assisted turnover device enables the middle plate assembly to turn over a patient, the patient can change from lying on his side to lying on his side.

Preferably, the air cushion air bag is cylindrical, the surface material of the air cushion air bag is medical thickened environment-friendly PVC fabric, and the surface material of the air cushion air bag is medical thickened environment-friendly PVC fabric to reduce damage and friction to the skin of a patient; the air faucet comprises a connecting pipe, the connecting pipe is fixedly sleeved with the air cushion air bags, one end of the connecting pipe is fixedly provided with a conical head, a one-way valve is arranged in the conical head, one end of the conical head is sleeved with a ball nozzle, and any one of the air cushion air bags is provided with one air faucet, so that the negative pressure value of any one of the air cushion air bags can be set, and the plurality of air cushion air bags which are laid flatly are compounded and adapt to human mechanics; the fixing assembly comprises breathable cloth, the breathable cloth is arranged on the upper surface of the central plate, a plurality of elastic belts are fixedly connected to the upper surface of the breathable cloth and are U-shaped and arranged in two rows, the elastic belts are sleeved with the air cushion air bags, and any one air cushion air bag is sleeved in the elastic belts so as to be convenient to install and fix.

Preferably, the middle plate assembly is rectangular, two ends of the central plate are rotatably hinged with the two middle side plates, two sides of the central plate are rotatably hinged with the two side plates, two ends of any one of the side plates are rotatably hinged with the two corner plates, two ends of the central plate are rotatably hinged with the two middle side plates, and two ends of the side plates are rotatably hinged with the two corner plates, so that the turning plate can smoothly rotate along the fixed plate; the utility model discloses a bed plate assembly, including bed plate, fixed plate, bed plate, baffle, fixed plate, bed plate subassembly is the rectangle form, the both ends of fixed plate are rotated with two and are articulated, the cross spout has all been seted up to the both sides department of fixed plate, sliding connection stop device in the cross spout, set up two first mounting grooves and a second mounting groove in the fixed plate, install first adjusting device and helping hand turnover device in the first mounting groove, turn over the fixed surface and be equipped with the backplate on board both sides, turn over the board and rotate along the fixed plate, and two rotation opposite directions that turn over the board, make patient's upper part of the body and shank motion opposite direction, fixed plate fixed mounting to make first adjusting device and helping hand turnover device can stable work.

Preferably, the limiting device comprises a second motor, the second motor is fixedly installed in a second installation groove, a second worm is fixedly installed at the output end of the second motor, the second worm is connected with a second worm wheel in a meshed manner, lead screws are fixedly installed on the surfaces of the two sides of the second worm wheel, the thread directions of the two lead screws are opposite, the lead screws are rotatably connected with the fixing plate, one end of each lead screw is in threaded connection with a U-shaped seat, the U-shaped seats are slidably arranged in the cross sliding grooves, limiting strips are fixedly connected to the upper ends of the U-shaped seats, the inner side surfaces of the limiting strips are attached to the outer side surfaces of the side plates, when a patient needs to lie down, in order to stably place the middle plate assembly on the upper surface of the bottom plate assembly, the second motor drives the second worm to rotate, the second worm wheel drives the two lead screws with opposite thread directions to rotate, and then the two limiting strips reversely slide and extrude the side plates, thereby spacing the curb plate, when needs adjust the patient and lie the appearance, with two spacing reverse slip and break away from the curb plate.

Preferably, the first adjusting device comprises a first motor, the first motor is fixedly installed in the first installation groove, a driving bevel gear is fixedly arranged at the output end of the first motor, the driving bevel gear is connected with two driven bevel gears in a meshing manner, the driven bevel gears are respectively connected with a first worm in a transmission manner, the first worm is connected with a first worm wheel in a meshing manner, the first worm wheel is connected with the turning plate in a transmission manner, the first motor enables the two driven bevel gears to rotate through the driving bevel gear, and enables the turning plate corresponding to the first worm wheel to rotate through the first worm; a first rotating shaft is fixedly connected in the driven conical gear, the outer surface of the first rotating shaft is rotatably connected with two supporting blocks, the two supporting blocks are fixedly connected with the side surfaces of the side plates and the angle plates, a second rotating shaft is fixedly arranged in the first worm wheel and is rotatably connected with the fixing plate, the second rotating shaft is in transmission connection with the turning plate, the driven conical gear can drive the first worm to rotate through the first rotating shaft, and then the second rotating shaft drives the turning plate to rotate through the first worm wheel; the assisting turnover device comprises a third motor, the third motor is fixedly installed in a first installation groove, a third worm is fixedly arranged at the output end of the third motor, a third worm wheel is connected to the third worm in a meshed mode, a third rotating shaft is fixedly arranged in the third worm wheel, the two ends of the third rotating shaft are rotatably connected with the inner wall of the first installation groove, first gears are fixedly arranged at the two ends of the third rotating shaft, a T-shaped plate is fixedly arranged at the surface of each first gear, the upper surface of each T-shaped plate is attached to the bottom surface of a side plate, and the third motor rotates through the third worm to drive the third worm to rotate the T-shaped plate, so that the side plates and the corner plates rotate upwards along the central plate through the T-shaped plate, and then a patient can be assisted to change from lying to lying in a side lying posture.

Compared with the prior art, the invention has the beneficial effects that:

1. any one air cushion air bag is sleeved in the elastic belt, so that the air cushion air bag is convenient to fixedly install, and the plurality of air cushion air bags are smoothly installed and are convenient for a patient to use;

2. the two ends of the central plate are rotatably hinged with the two middle side plates, and the two ends of the side plates are rotatably hinged with the two angle plates, so that when the turning plates can smoothly rotate along the fixed plate, and the rotating directions of the two turning plates along the fixed plate are opposite, the moving directions of the upper body and the legs of a patient are opposite;

3. the third motor drives the third worm wheel to rotate through the third worm, so that the third rotating shaft drives the T-shaped plate to rotate, the side plate and the angle plate rotate upwards along the central plate through the T-shaped plate, and then the patient can be assisted to change from lying to lying on one side.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the entire structure of the present invention.

FIG. 2 is a schematic view of the air faucet of the present invention.

FIG. 3 is a schematic view of a structural fixing assembly of the present invention.

FIG. 4 is a schematic view of a laminate assembly in the construction of the present invention.

FIG. 5 is a schematic view of the interior of a structural floor assembly according to the present invention.

FIG. 6 is a schematic view of a structural floor assembly of the present invention.

Fig. 7 is a schematic diagram of a first adjusting device, a limiting device and a power-assisted turning-over device of the structure of the invention.

FIG. 8 is an enlarged view of the point A in FIG. 7.

In the figure: 1. an air cushion air bag; 2. a fixing assembly; 21. ventilating cloth; 22. an elastic band; 3. a mid-deck assembly; 31. a center plate; 32. a middle sideboard; 33. a side plate; 34. a gusset; 4. a bottom deck assembly; 41. a fixing plate; 411. a first mounting groove; 412. a second mounting groove; 413. a cross-shaped chute; 42. turning over a plate; 421. a guard plate; 5. a first adjusting device; 51. a first motor; 52. a driving bevel gear; 53. a driven bevel gear; 54. a first rotating shaft; 55. a support block; 56. a first worm; 57. a first worm gear; 58. a second rotating shaft; 6. a limiting device; 61. a second motor; 62. a second worm; 63. a second worm gear; 64. a screw rod; 65. a U-shaped seat; 66. a limiting strip; 7. an air tap; 71. a connecting pipe; 72. a conical head; 73. a one-way valve; 74. a ball nozzle; 8. a power-assisted turning-over device; 81. a third motor; 82. a third worm; 83. a third worm gear; 84. a third rotating shaft; 85. a first gear; 86. t-shaped plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: as shown in fig. 1-8, the invention provides a negative pressure air cushion for preventing pressure sores, which comprises air cushion air bags 1, wherein a plurality of air cushion air bags 1 are arranged, air nozzles 7 are arranged at one ends of the air cushion air bags 1, the air cushion air bags 1 are detachably connected with a fixing component 2, a middle layer plate component 3 is arranged at the bottom end of the fixing component 2, the middle layer plate component 3 comprises a central plate 31, a middle side plate 32, a side plate 33 and an angle plate 34, a bottom plate component 4 is arranged at the bottom end of the middle layer plate component 3, the bottom plate component 4 comprises a fixing plate 41 and a turning plate 42, a first adjusting device 5, a limiting device 6 and a turning power assisting device 8 are arranged in the bottom plate component 4, the first adjusting device 5 is in transmission connection with the turning plate 42, and the power assisting turning device 8 is in transmission connection with the side plate 33.

Through adopting above-mentioned technical scheme, a plurality of air cushion gasbag 1 is through the installation that fixed subassembly 2 is leveled, during the use, and bottom plate subassembly 4 can realize the rotation regulation of fixed plate 41 and turnover panel 42 through first adjusting device 5, and power-assisted turnover device 8 makes middle lamella subassembly 3 can overturn the patient, makes the patient can become the side by lying down.

The air cushion air bag 1 is cylindrical, and the surface material of the air cushion air bag 1 is medical thickened environment-friendly PVC fabric.

Through adopting above-mentioned technical scheme, the surface material of air cushion gasbag 1 reduces damage and the friction to patient's skin for medical thickening environmental protection PVC surface fabric.

The air tap 7 comprises a connecting pipe 71, the connecting pipe 71 is fixedly sleeved with the air cushion airbag 1, one end of the connecting pipe 71 is fixedly provided with a conical head 72, a one-way valve 73 is arranged in the conical head 72, and one end of the conical head 72 is sleeved with a ball nozzle 74.

By adopting the technical scheme, any one air cushion air bag 1 is provided with the air tap 7, so that the negative pressure value of any one air cushion air bag 1 can be set, and a plurality of air cushion air bags 1 which are laid flatly are compounded and adapt to human mechanics.

The fixing assembly 2 comprises a breathable cloth 21, the breathable cloth 21 is arranged on the upper surface of the central plate 31, a plurality of elastic belts 22 are fixedly connected to the upper surface of the breathable cloth 21, the elastic belts 22 are U-shaped, the elastic belts 22 are arranged in two rows, and the air cushion airbag 1 is sleeved in the elastic belts 22.

By adopting the technical scheme, any one air cushion air bag 1 is sleeved in the elastic belt 22, so that the air cushion air bag 1 is convenient to mount and fix.

The middle plate component 3 is rectangular, two ends of the central plate 31 are hinged with two middle side plates 32, two sides of the central plate 31 are hinged with two side plates 33, and two ends of any one side plate 33 are hinged with two corner plates 34.

By adopting the above technical scheme, two ends of the central plate 31 are rotatably hinged with the two middle side plates 32, and two ends of the side plates 33 are rotatably hinged with the two angle plates 34, so that the turning plate 42 can smoothly rotate along the fixed plate 41.

Bottom plate subassembly 4 is the rectangle form, and the both ends of fixed plate 41 are turned over board 42 rotation and are articulated with two, and cross spout 413 has all been seted up to the both sides department of fixed plate 41, and sliding connection stop device 6 in the cross spout 413 has seted up two first mounting grooves 411 and a second mounting groove 412 in the fixed plate 41, installs first adjusting device 5 and helping hand turnover device 8 in the first mounting groove 411, turns over board 42 both sides fixed surface and is equipped with backplate 421.

By adopting the technical scheme, the turning plates 42 rotate along the fixing plate 41, the rotating directions of the two turning plates 42 are opposite, so that the moving directions of the upper body and the legs of a patient are opposite, and the fixing plate 41 is fixedly installed, so that the first adjusting device 5 and the power-assisted turnover device 8 can stably work.

Stop device 6 is including second motor 61, second motor 61 fixed mounting is in second mounting groove 412, the fixed second worm 62 that is equipped with of output of second motor 61, the meshing of second worm 62 is connected with second worm wheel 63, the both sides surface of second worm wheel 63 all fixes and is equipped with lead screw 64, the screw thread opposite direction of two lead screws 64, lead screw 64 all rotates with fixed plate 41 to be connected, and the one end threaded connection of lead screw 64 has U-shaped seat 65, U-shaped seat 65 slides and locates in cross spout 413, the upper end fixedly connected with spacing strip 66 of U-shaped seat 65, the outside surface of curb plate 33 is connected in the laminating of the inboard surface of spacing strip 66.

Through adopting above-mentioned technical scheme, when the patient need lie flat, in order to make middle lamella subassembly 3 stably place in 4 upper surfaces of bottom lamella subassembly, accessible second motor 61 transmission second worm 62 rotates to lead screw 64 through two opposite screw thread directions of second worm wheel 63 transmission rotates, makes two spacing strips 66 reverse slip and extrude curb plate 33 then, thereby spacing to curb plate 33, when needs adjust the patient and lie the appearance, with two spacing strips 66 reverse slip and break away from curb plate 33.

The first adjusting device 5 comprises a first motor 51, the first motor 51 is fixedly installed in a first installation groove 411, a driving bevel gear 52 is fixedly arranged at the output end of the first motor 51, the driving bevel gear 52 is connected with two driven bevel gears 53 in an engaged manner, the driven bevel gears 53 are respectively connected with a first worm 56 in a transmission manner, the first worm 56 is connected with a first worm wheel 57 in an engaged manner, and the first worm wheel 57 is connected with the turning plate 42 in a transmission manner.

By adopting the above technical solution, the first motor 51 rotates the two driven bevel gears 53 through the driving bevel gear 52, and drives the first worm gear 57 to rotate the corresponding flap 42 through the first worm 56.

The driven bevel gear 53 is fixedly connected with a first rotating shaft 54, the outer surface of the first rotating shaft 54 is rotatably connected with two supporting blocks 55, the two supporting blocks 55 are fixedly connected with the side surfaces of the side plates 33 and the angle plates 34, a second rotating shaft 58 is fixedly arranged in the first worm gear 57, the second rotating shaft 58 is rotatably connected with the fixed plate 41, and the second rotating shaft 58 is in transmission connection with the turning plate 42.

By adopting the technical scheme, the driven bevel gear 53 can drive the first worm 56 to rotate through the first rotating shaft 54, and then drive the turning plate 42 to rotate through the second rotating shaft 58 through the first worm gear 57.

The assisting turning-over device 8 comprises a third motor 81, the third motor 81 is fixedly installed in a first installation groove 411, a third worm 82 is fixedly arranged at the output end of the third motor 81, the third worm 82 is connected with a third worm wheel 83 in a meshed mode, a third rotating shaft 84 is fixedly arranged in the third worm wheel 83, two ends of the third rotating shaft 84 are rotatably connected with the inner wall of the first installation groove 411, first gears 85 are fixedly arranged at two ends of the third rotating shaft 84, a T-shaped plate 86 is fixedly arranged on the surface of each first gear 85, and the upper surfaces of the T-shaped plates 86 are attached to the bottom surfaces of the side plates 33.

By adopting the above technical solution, the third motor 81 drives the third worm wheel 83 to rotate through the third worm 82, so that the third rotating shaft 84 drives the T-shaped plate 86 to rotate, and the side plate 33 and the angle plate 34 rotate upwards along the central plate 31 through the T-shaped plate 86, thereby assisting the patient to change from lying to lying on his side.

The working principle is as follows: when a patient needs to lie down, in order to make the middle plate component 3 stably placed on the upper surface of the bottom plate component 4, the second motor 61 can drive the second worm 62 to rotate, and the second worm wheel 63 can drive the two screw rods 64 with opposite thread directions to rotate, so that the two limit strips 66 reversely slide and extrude the side plate 33, thereby limiting the side plate 33, when the lying posture of the patient needs to be adjusted, the two limit strips 66 are reversely slid and separated from the side plates 33, then the first motor 51 makes the two driven bevel gears 53 rotate through the driving bevel gear 52, and makes the first worm gear 57 drive the corresponding turning plate 42 to rotate through the first worm 56, because the fixing plate 41 is fixedly installed, the two ends of the central plate 31 are rotatably hinged with the two middle side plates 32, and the two ends of the side plates 33 are rotatably hinged with the two angle plates 34, so that when the turning plate 42 can smoothly rotate along the fixing plate 41, and the rotating directions of the two turning plates 42 are opposite, the moving directions of the upper body and the legs of the patient are opposite, in addition, the third motor 81 drives the third worm gear 83 to rotate through the third worm 82, so that the third rotating shaft 84 drives the T-shaped plate 86 to rotate, so that the side plates 33 and the angle plates 34 rotate upwards along the central plate 31 through the T-shaped plate 86, and then the change of the patient from lying to lying posture to lying on the side can be assisted.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The negative pressure air cushion of sore is pressed in prevention, including air cushion gasbag (1), its characterized in that: the number of the air cushion air bags (1) is multiple, one end of each air cushion air bag (1) is provided with an air tap (7), the air cushion air bag (1) is detachably connected with a fixed component (2), the bottom end of the fixed component (2) is provided with a middle plate component (3), the middle plate component (3) comprises a central plate (31), a middle side plate (32), a side plate (33) and an angle plate (34), the bottom end of the middle layer plate component (3) is provided with a bottom plate component (4), the bottom plate component (4) comprises a fixed plate (41) and a turning plate (42), a first adjusting device (5), a limiting device (6) and a power-assisted turnover device (8) are arranged in the bottom plate component (4), the first adjusting device (5) is in transmission connection with the turning plate (42), and the power-assisted turnover device (8) is in transmission connection with the side plate (33).

2. The negative pressure air cushion for preventing pressure sores as defined in claim 1, wherein the air cushion air bag (1) is cylindrical, and the surface of the air cushion air bag (1) is made of medical thickened environment-friendly PVC fabric.

3. The negative pressure air cushion for preventing pressure sores as claimed in claim 1, wherein the air tap (7) comprises a connecting pipe (71), the connecting pipe (71) is fixedly sleeved with the air cushion airbag (1), a cone head (72) is fixedly arranged at one end of the connecting pipe (71), a one-way valve (73) is arranged in the cone head (72), and a ball nozzle (74) is sleeved in one end of the cone head (72).

4. The negative pressure air cushion for preventing pressure sores as defined in claim 1, wherein the fixing assembly (2) includes a breathable fabric (21), the breathable fabric (21) is disposed on the upper surface of the central plate (31), a plurality of elastic bands (22) are fixedly connected to the upper surface of the breathable fabric (21), the elastic bands (22) are U-shaped, the plurality of elastic bands (22) are disposed in two rows, and the air cushion airbag (1) is sleeved in the elastic bands (22).

5. The negative pressure air cushion for preventing pressure sores as defined in claim 1, wherein the middle plate member (3) has a rectangular shape, both ends of the central plate (31) are pivotally connected to two middle side plates (32), both sides of the central plate (31) are pivotally connected to two side plates (33), and both ends of any one of the side plates (33) are pivotally connected to two corner plates (34).

6. The negative pressure air cushion for preventing pressure sores as claimed in claim 1, wherein the bottom plate assembly (4) is rectangular, two ends of the fixing plate (41) are rotatably hinged to the two turning plates (42), cross sliding grooves (413) are formed in two sides of the fixing plate (41), a limiting device (6) is slidably connected in the cross sliding grooves (413), two first mounting grooves (411) and one second mounting groove (412) are formed in the fixing plate (41), a first adjusting device (5) and a turning device (8) are mounted in the first mounting grooves (411), and the upper surfaces of two sides of the turning plates (42) are fixedly provided with the protecting plates (421).

7. The negative pressure air cushion for preventing pressure sores as defined in claim 6, wherein the limiting means (6) includes a second motor (61), the second motor (61) is fixedly arranged in the second mounting groove (412), the output end of the second motor (61) is fixedly provided with a second worm (62), the second worm (62) is connected with a second worm wheel (63) in a meshing manner, screw rods (64) are fixedly arranged on the surfaces of the two sides of the second worm wheel (63), the thread directions of the two screw rods (64) are opposite, the screw rods (64) are rotatably connected with the fixing plate (41), and one end of the screw rod (64) is connected with a U-shaped seat (65) in a threaded manner, the U-shaped seat (65) is arranged in the cross sliding groove (413) in a sliding manner, the upper end fixedly connected with spacing strip (66) of U-shaped seat (65), the outside surface of curb plate (33) is connected in the laminating of spacing strip (66) inboard surface.

8. The negative pressure air cushion for preventing pressure sores as claimed in claim 6, wherein the first adjusting device (5) comprises a first motor (51), the first motor (51) is fixedly installed in a first installation groove (411), a driving bevel gear (52) is fixedly arranged at an output end of the first motor (51), two driven bevel gears (53) are connected to the driving bevel gear (52) in a meshed manner, the driven bevel gears (53) are respectively connected with a first worm (56) in a transmission manner, a first worm wheel (57) is connected to the first worm (56) in a meshed manner, and the first worm wheel (57) is connected with the turnover plate (42) in a transmission manner.

9. The negative pressure air cushion for preventing pressure sores as claimed in claim 8, wherein a first rotating shaft (54) is fixedly connected inside the driven bevel gear (53), two supporting blocks (55) are rotatably connected to the outer surface of the first rotating shaft (54), the two supporting blocks (55) are fixedly connected to the side surfaces of the side plates (33) and the angle plates (34), a second rotating shaft (58) is fixedly arranged inside the first worm gear (57), the second rotating shaft (58) is rotatably connected to the fixing plate (41), and the second rotating shaft (58) is in transmission connection with the turning plate (42).

10. The negative pressure air cushion for preventing pressure sores as defined in claim 6, wherein the power-assisted turnover device (8) comprises a third motor (81), the third motor (81) is fixedly installed in the first installation groove (411), a third worm (82) is fixedly arranged at an output end of the third motor (81), the third worm (82) is connected with a third worm wheel (83) in a meshed manner, a third rotating shaft (84) is fixedly arranged in the third worm wheel (83), two ends of the third rotating shaft (84) are rotatably connected with an inner wall of the first installation groove (411), two ends of the third rotating shaft (84) are fixedly provided with a first gear (85), a T-shaped plate (86) is fixedly arranged on the surface of the first gear (85), and the upper surface of the T-shaped plate (86) is attached to the bottom surface of the side plate (33).