Back type rollover air cushion capable of preventing pressure injury

Abstract

The back type rollover air cushion comprises an inflatable square cushion body capable of being carried on the back of the body, the middle of an inner cavity of the cushion body is divided into a front rollover cavity and a rear rollover cavity through a partition cushion so that the front side and the rear side can be inflated alternately, and the rollover cavities are connected with an inflation mechanism. The side turning cavity extends downwards to form side turning parts which are arranged left and right and provided with triangular sections, and blowing holes capable of blowing air to the back are evenly formed in the upper end of the side turning cavity. The blowing holes can blow air to the back of the patient to guarantee breathability. The protection mechanisms for preventing excessive rollover are arranged at the front end and the rear end of the pad body, the protection mechanisms can prevent the pad body from completely rollover due to an overlarge rollover angle, the safety of a patient is guaranteed, the fixing mechanisms for fixing the four limbs are further arranged at the four corners of the upper end of the pad body, the fixing mechanisms fix the four limbs, and the patient is prevented from slipping off from the pad body.

Description

Technical Field

[0001] The invention relates to the field of rollover air cushions, in particular to a back-type pressure-injury-preventing rollover air cushion. Background Art

[0002] Pressure injury is a local injury to the skin and / or subcutaneous tissue, formerly known as pressure sores or bedsores, which is the result of pressure or pressure combined with shear force. Pressure injury or infection is prone to occur in disabled people who are bedridden or in wheelchairs for a long time, the elderly and critically ill patients. Once the injury or infection is formed, it can increase the patient's pain, reduce their quality of life, and increase their medical expenses. In mild cases, the wound will take weeks or even months to heal; in severe cases, it may cause sepsis, leading to amputation or death. In addition, the above patients have low immunity, limited lung function, weakened cough reflex, and respiratory secretions accumulate in the small and medium trachea, bacteria breed, and easily induce aspiration pneumonia, prolong hospitalization time, and increase the risk of death. In response to the above situation, the hospital currently lays air cushions, and there are multiple inflatable ridges on the surface of the air cushion. The adjacent ridges can be inflated intermittently. On the one hand, after inflation, the ridges on the upper side of the air cushion can lift the patient, thereby creating a gap between the air cushion body and the air cushion body for easy ventilation. On the other hand, intermittent inflation can continuously redistribute the compressed parts of the body. The above two methods can effectively avoid pressure injuries.

[0003] The current inflatable mattresses have the following disadvantages: first, they are relatively large, with a size close to that of a mattress, making them inconvenient to lay and having poor portability; second, the inflatable mattress does not have a turning-over function and requires an additional turning-over pad, and requires nursing staff to operate it alone, increasing the workload of nursing staff. For example, the announcement number CN115137586A states, "The present invention discloses a prone ventilation and pressure sore prevention air cushion, comprising a head pad, a main air cushion and an automatic program-controlled device arranged on the outside of the main air cushion, the head pad comprising a bottom pad and side pads, a fixing belt being provided at the bottom end of the bottom pad, grooves being provided on both sides of the bottom pad, and two side pads being respectively placed in the grooves; the main air cushion comprises a plurality of strip air bags and two air guide tubes, the strip air bags being connected to the two air guide tubes in an orderly spaced relationship, a tracheostomy groove being provided on the top of the main air cushion for placing the breathing tube of a tracheostomy patient, and the main air cushion also comprises a The invention includes a middle groove for placing the male patient's genitals and urinary catheter; the head pad and the main air cushion in the invention are convenient for placing the tracheal tube; the automatic program-controlled air cushion is provided to realize a wave-shaped massage on the patient's body parts, promote blood circulation, prevent muscle atrophy and pressure sores, and is easy to operate and saves manpower. This type of air cushion can be inflated to prevent pressure sores, but cannot turn over. For example, a mattress and a hospital bed with announcement number CN112022539A cannot turn over; therefore, how to effectively prevent pressure injuries, facilitate turning over, be portable, and be convenient for patients to use are problems that technicians in this field urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a back-type anti-pressure injury rollover air cushion to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a back-type anti-pressure injury rollover air cushion, comprising an inflatable square cushion body that can be carried on the back, the middle of the inner cavity of the cushion body is divided into two front and rear rollover chambers by a spacer so that the front and rear sides are alternately inflated, and the rollover chamber is connected to an inflation mechanism, the rollover chamber extends downward to form a rollover portion with a triangular cross section arranged on the left and right, and the upper end of the rollover chamber is evenly provided with blowing holes that can blow air to the back. The blowing holes can blow air to the patient's back to ensure air permeability.

[0006] The front and rear ends of the cushion body are provided with protective mechanisms to prevent excessive rollover. The protective mechanisms can prevent the cushion body from completely rolling over due to excessive rollover angles, thereby ensuring the safety of the patient. Fixing mechanisms for fixing the limbs are also provided at the four corners of the upper end of the cushion body. The fixing mechanisms fix the limbs to prevent the patient from slipping off the cushion body.

[0007] Preferably, the inflation mechanism includes a branch pipe connected to the left end of the rollover chamber and a solenoid valve arranged on the branch pipe, the ends of the two branch pipes are connected through a main pipe, and the end of the main pipe is connected to an air pump with a built-in battery, and the two solenoid valves are electrically connected to a controller to achieve alternating operation. The controller controls the two solenoid valves to open alternately, and this time can be set, which is a prior art, and the air pump is also a prior art and can be adjusted in size.

[0008] Preferably, the cushion body is convexly formed with a plurality of parallel strip-shaped first protrusions. The first protrusions can lift the patient's skin, and the gaps between the first protrusions are convenient for air circulation to prevent the heat on the patient's back from being unable to dissipate in time, thereby ensuring air permeability and keeping the back skin dry.

[0009] Preferably, the protective mechanism includes four drawstrings symmetrically connected to the front and rear ends of the cushion body, and the drawstrings can be tied to the bed guardrails. The drawstrings can prevent the patient from excessively rolling over and play a protective role. It should be noted that the drawstrings are initially in a loose state because the cushion body needs space to roll over.

[0010] Preferably, the fixing mechanism comprises four sets of fixing belts for fixing the four limbs respectively, and each set of fixing belts is provided with two opposite fixing belts, and the ends of the two fixing belts are connected by Velcro, so as to facilitate opening and fixing, and also facilitate adjusting the tightness.

[0011] Preferably, the fixing belt is in the shape of an airbag with an inner cavity connected to the pad body. In this way, the fixing belt is also tough and will not hurt the limbs. The fixing belt for fixing the legs can be longer and the angle can be adjusted as needed to fix it at the thigh root.

[0012] Preferably, the inner protrusion of the fixing belt forms a plurality of strip-shaped second protrusions, so as to provide a gap between the fixing belt and the patient's skin for ventilation. Of course, the blowing hole can extend to the inner side of the fixing belt.

[0013] Preferably, it also includes a safety valve mechanism connected to the right end of the cushion body to deflate when the cushion body stands up with the patient. The safety valve mechanism is mainly used to prevent the air pump from being accidentally opened to inflate when the patient is helped to sit up, to ensure safety, and also to prevent the patient from wearing the cushion directly when sitting in a wheelchair to go out for ventilation, avoiding taking it off and back, which is more convenient. At this time, it is necessary to prevent it from being accidentally opened.

[0014] Preferably, the safety valve mechanism includes a soft exhaust pipe connected to the right end of the cushion body, and the end of the exhaust pipe is connected to a piston cylinder with an opening at the right end through two symmetrical branch pipes. The reason for the symmetry is mainly to facilitate the verticality of the piston cylinder when the cushion body is vertical. The piston cylinder is provided with an exhaust hole corresponding to the branch pipe, and the exhaust hole is close to the left end of the piston cylinder so that the right end can face downward when vertical. Of course, there is still a distance from the leftmost end to facilitate the installation of the elastic return component. A piston block capable of blocking the exhaust hole is installed in the piston cylinder, and a vent hole running through the left and right is provided in the middle of the piston block. The left end of the piston block is connected to the left end of the inner cavity of the piston cylinder by a rubber strip, which is the elastic return component and can also be a spring. When the patient sits or stands up, the vent hole is opened by the downward movement of the piston block to release air and ensure safety. At the same time, it has a second function. It is softer to carry, equivalent to a backrest. At the same time, you can turn on the air pump to blow air through the blowing holes. Because of the air release of the air holes, the thickness of the side-flipping part is very low and it will not flip over. It can dissipate heat from the back in summer, killing two birds with one stone.

[0015] Preferably, the left end of the piston cylinder is threadedly connected to a knob, and the left end of the rubber strip is mounted on the right end of the knob. Here, the piston cylinder is cylindrical, and when the knob is rotated, the rubber strip can rotate due to excessive torsion.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Compared with the traditional turning air cushion, the cushion body here is slightly larger than the patient's back, which can be carried on the back and is more convenient to carry. The fixing belt fixes the patient's limbs, and the air pump inflates the side turning chamber on the side where the solenoid valve is opened. One side of the cushion body is inflated, and at the same time, the first bulge lifts the patient to facilitate air intake on the back. At the same time, the blowing hole can blow air to ensure the air permeability of the back and avoid pressure injuries. The side turning part is inflated to turn the cushion body sideways, which is convenient for the patient to expectorate. The pull belt avoids complete side turning and maintains a certain side turning angle. Here, expectoration can be discharged with the help of an expectorant, or an expectoration mechanism can be set on the cushion body. When the other solenoid valve is opened, the corresponding side is inflated, and the solenoid valve on the closed side is closed, and air is released through the blowing hole at the same time, and it slowly concave;

[0018] 2. Each set of fixing belts is equipped with two, which are easy to open and fixed by Velcro. The fixing belts are airbag-shaped and connected to the inner cavity of the pad body, which is softer and avoids pressure injuries to the limbs.

[0019] 3. A second protrusion is also provided on the inner side of the fixing belt to ensure air permeability;

[0020] 4. The setting of the piston cylinder can prevent the cushion from being inflated when the patient stands up, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the prior art;

[0022] Figure 2 The front view of the first embodiment of the present invention

[0023] Figure 3 is a top view of a first embodiment of the present invention;

[0024] Figure 4 is a first isometric view of a first embodiment of the present invention;

[0025] Figure 5 is a second isometric view of the first embodiment of the present invention;

[0026] Figure 6 It is a front view of a second embodiment of the present invention;

[0027] Figure 7 It is a structural schematic diagram of a piston cylinder according to a second embodiment of the present invention;

[0028] Figure 8 It is an isometric view of the second embodiment of the present invention.

[0029] Figure 2 —8: 1. cushion body; 11. flip-over part; 12. blowing hole; 13. branch pipe; 14. solenoid valve; 15. air pump; 16. first protrusion; 2. drawstring; 3. fixing belt; 31. Velcro; 32. second protrusion; 4. exhaust pipe; 41. branch pipe; 42. piston cylinder; 43. piston block; 44. air vent; 45. rubber strip; 46. knob. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figures 2 to 5 The present invention provides a technical solution for a back-type anti-pressure injury rollover air cushion: a back-type anti-pressure injury rollover air cushion, comprising an inflatable square cushion body 1 that can be carried on the back, the middle of the inner cavity of the cushion body 1 is divided into two front and rear rollover chambers by a partition so that the front and rear sides can be alternately inflated, and the rollover chamber is connected to an inflation mechanism, the inflation mechanism includes a branch pipe 13 connected to the left end of the rollover chamber and an electromagnetic valve 14 arranged on the branch pipe 13, the ends of the two branch pipes 13 are connected by a main pipe, and the end of the main pipe is connected to an air pump 15 with a built-in battery. The built-in battery can be charged and can also be used without a power source, which is more convenient. The two electromagnetic valves 14 are electrically connected to a controller to achieve alternating operation. The controller controls the two electromagnetic valves 14 to open alternately, and this time can be set, which is a prior art, and the air pump 15 is also a prior art and can be adjusted in size. The rollover cavity extends downward to form a rollover portion 11 with a triangular cross-section arranged on the left and right. After the rollover portion 11 is inflated, the rollover cavity on the side can be lifted up to form an inclined shape to achieve rollover. The specific inclination angle is determined according to the inclination of the relative end faces of the two rollover portions 11, because the relative end faces will be against the bed after one side is inflated, which determines the rollover angle. Blowing holes 12 that can blow air to the back are evenly opened at the upper end of the rollover cavity. The blowing holes 12 can blow air to the patient's back to ensure air permeability. The cushion body 1 is convex to form a plurality of parallel strip-shaped first protrusions 16. The first protrusions 16 can lift the patient's skin, and the gaps between the first protrusions 16 are convenient for air circulation to prevent the heat from the patient's back from being unable to dissipate in time, thereby ensuring air permeability and keeping the back skin dry.

[0033] The front and rear ends of the cushion body 1 are provided with a protective mechanism to prevent excessive rollover. The protective mechanism can prevent the cushion body 1 from completely rolling over due to excessive rollover angles, thereby ensuring the safety of the patient. The protective mechanism includes four drawstrings 2 symmetrically connected to the front and rear ends of the cushion body 1, and the drawstrings 2 can be tied to the guardrails of the hospital bed. The drawstrings 2 can prevent the patient from excessive rollover and play a protective role. It should be noted that the drawstrings 2 are initially in a loose state because the cushion body 1 needs room for movement in order to roll over. In addition, the four corners at the upper end of the cushion body 1 are also provided with fixing mechanisms for fixing the limbs. The fixing mechanisms fix the limbs to prevent the patient from slipping off the cushion body 1.

[0034] The fixing mechanism includes four groups of fixing belts 3 for fixing the limbs respectively, and each group of fixing belts 3 is provided with two opposite ones, and the ends of the two fixing belts 3 are connected by Velcro 31. It is convenient to open and fix, and it is also convenient to adjust the tightness. The fixing belt 3 is in the shape of an airbag whose inner cavity is connected to the pad body 1. In this way, the fixing belt 3 also has toughness and will not strangle the limbs. The fixing belt 3 for fixing the legs here can be longer, and the angle can also be adjusted as needed and fixed at the thigh root position. The inner side of the fixing belt 3 is raised to form a plurality of strip-shaped second protrusions 32, so that there is a gap between the fixing belt 3 and the patient's skin, which is convenient for ventilation. Of course, the blowing hole 12 can extend to the inner side of the fixing belt 3.

[0035] Example 2

[0036] See also Figures 6 to 8 The present invention provides a technical solution for a back-type anti-pressure injury rollover air cushion: a back-type anti-pressure injury rollover air cushion, comprising an inflatable square cushion body 1 that can be carried on the back, the middle of the inner cavity of the cushion body 1 is divided into two front and rear rollover chambers by a partition so that the front and rear sides can be alternately inflated, and the rollover chamber is connected to an inflation mechanism, the inflation mechanism includes a branch pipe 13 connected to the left end of the rollover chamber and an electromagnetic valve 14 arranged on the branch pipe 13, the ends of the two branch pipes 13 are connected by a main pipe, and the end of the main pipe is connected to an air pump 15 with a built-in battery. The built-in battery can be charged and can also be used without a power source, which is more convenient. The two electromagnetic valves 14 are electrically connected to a controller to achieve alternating operation. The controller controls the two electromagnetic valves 14 to open alternately, and this time can be set, which is a prior art, and the air pump 15 is also a prior art and can be adjusted in size. The rollover cavity extends downward to form a rollover portion 11 with a triangular cross-section arranged on the left and right. After the rollover portion 11 is inflated, the rollover cavity on the side can be lifted up to form an inclined shape to achieve rollover. The specific inclination angle is determined according to the inclination of the relative end faces of the two rollover portions 11, because the relative end faces will be against the bed after one side is inflated, which determines the rollover angle. Blowing holes 12 that can blow air to the back are evenly opened at the upper end of the rollover cavity. The blowing holes 12 can blow air to the patient's back to ensure air permeability. The cushion body 1 is convex to form a plurality of parallel strip-shaped first protrusions 16. The first protrusions 16 can lift the patient's skin, and the gaps between the first protrusions 16 are convenient for air circulation to prevent the heat from the patient's back from being unable to dissipate in time, thereby ensuring air permeability and keeping the back skin dry.

[0037] The front and rear ends of the cushion body 1 are provided with a protective mechanism to prevent excessive rollover. The protective mechanism can prevent the cushion body 1 from completely rolling over due to excessive rollover angles, thereby ensuring the safety of the patient. The protective mechanism includes four drawstrings 2 symmetrically connected to the front and rear ends of the cushion body 1, and the drawstrings 2 can be tied to the guardrails of the hospital bed. The drawstrings 2 can prevent the patient from excessive rollover and play a protective role. It should be noted that the drawstrings 2 are initially in a loose state because the cushion body 1 needs room for movement in order to roll over. In addition, the four corners at the upper end of the cushion body 1 are also provided with fixing mechanisms for fixing the limbs. The fixing mechanisms fix the limbs to prevent the patient from slipping off the cushion body 1.

[0038] The fixing mechanism includes four groups of fixing belts 3 for fixing the limbs respectively, and each group of fixing belts 3 is provided with two opposite ones, and the ends of the two fixing belts 3 are connected by Velcro 31. It is convenient to open and fix, and it is also convenient to adjust the tightness. The fixing belt 3 is in the shape of an airbag whose inner cavity is connected to the pad body 1. In this way, the fixing belt 3 also has toughness and will not strangle the limbs. The fixing belt 3 for fixing the legs here can be longer, and the angle can also be adjusted as needed and fixed at the thigh root position. The inner side of the fixing belt 3 is raised to form a plurality of strip-shaped second protrusions 32, so that there is a gap between the fixing belt 3 and the patient's skin, which is convenient for ventilation. Of course, the blowing hole 12 can extend to the inner side of the fixing belt 3.

[0039] It also includes a safety valve mechanism connected to the right end of the cushion body 1 to deflate the cushion body 1 as the patient stands up. The safety valve mechanism is mainly used to prevent the air pump 15 from being accidentally opened to inflate when the patient is helped to sit up, to ensure safety. In addition, when the patient goes out in a wheelchair for ventilation, the cushion body 1 can be worn directly to avoid taking it off and back, which is more convenient. At this time, it is necessary to avoid being accidentally opened. If the patient does not pay attention to getting up in advance, or the air pump 15 is opened when standing, the safety valve mechanism will open to release pressure, which is safer. The safety valve mechanism includes a soft exhaust pipe 4 connected to the right end of the cushion body 1, and the end of the exhaust pipe 4 is connected to a piston cylinder 42 with an opening at the right end through two symmetrical branch pipes 41. The reason for the symmetry is that when the cushion body 1 is vertical, the piston cylinder 42 can be vertical. The soft exhaust pipe 4 is convenient for the piston cylinder 42 to be placed on one side, and it can also be in a vertical state when the patient stands up. An exhaust hole corresponding to the branch pipe 41 is opened on the piston cylinder 42, and the exhaust hole is close to the left end of the piston cylinder 42 so that the right end can face downward when vertical. Of course, there is still a distance from the leftmost end to facilitate the installation of the elastic return component. A piston block 43 capable of blocking the exhaust hole is installed in the piston cylinder 42, and a ventilation hole 44 running through the left and right is opened in the middle of the piston block 43. The left end of the piston block 43 is connected to the left end of the inner cavity of the piston cylinder 42 by a rubber strip 45. The rubber strip 45 is the elastic return component, which can also be a spring. The left end of the piston cylinder 42 is threadedly connected with a knob 46, and the left end of the rubber strip 45 is installed on the right end of the knob 46. Here, the piston cylinder 42 is cylindrical. When the knob 46 rotates, the rubber strip 45 can rotate due to excessive torsion.

[0040] When the patient stands up, the cushion body 1 turns 180° clockwise, the piston cylinder 42 and the exhaust pipe 4 are lifted up, the piston cylinder 42 is in a vertical state, the rubber strip 45 is stretched under the action of gravity, and the piston block 43 slides over the exhaust hole, so that the gas in the cushion body 1 enters the piston cylinder 42 and is discharged through the air vent 44, achieving pressure relief, which is safer. When the patient lies down, the piston cylinder 42 is laid flat, and under the action of the rubber strip 45, the piston block 43 returns to its original position, blocks the exhaust hole, and closes it, so as to facilitate normal turning over. Here, when the piston block 43 falls to the inner end of the piston cylinder 42, it also blocks the exhaust hole.

[0041] When the patient sits or stands up, the piston block 43 moves downward, the vent hole 44 is opened, and air is released to ensure safety. At the same time, there is a second function, which is that the back is softer, equivalent to a backrest. At the same time, the air pump 15 can be turned on to blow air through the blowing hole 12. Because the air is released from the vent hole 44, the thickness of the side-turning part 11 is very low and it will not turn over, so that the back can be cooled in summer, killing two birds with one stone.

[0042] It should be noted that a vibration mechanism can also be provided on the cushion body 1 to pat the patient's back and facilitate the patient to expectorate, such as a vibrator, or some expectorants used on the market. When installed, they need to be inserted into the cushion body 1 to avoid hurting the patient. In addition, a safety valve can be connected to the rollover cavity to ensure that the pressure is not too high. When the other solenoid valve 14 is opened, air is inflated on the corresponding side, and the solenoid valve 14 on the closed side is closed, and air is released through the blowing hole 12 at the same time, and it slowly becomes concave.

[0043] Working principle: Compared with the traditional turning air cushion, the size of the cushion body 1 here is slightly larger than the patient's back, which can be carried on the back and is more convenient to carry. The fixing belt 3 fixes the patient's limbs, and the air pump 15 inflates the side rollover cavity on the side where the electromagnetic valve 14 is opened. The cushion body 1 is inflated, and at the same time, the first protrusion 16 holds up the patient to facilitate air intake on the back. At the same time, the blowing hole 12 can blow air to ensure the air permeability of the back and avoid pressure injuries. The rollover part 11 is inflated to roll the cushion body 1 sideways, which is convenient for the patient to expectorate. The pull belt 2 avoids complete rollover and maintains a certain rollover angle. Here, expectoration can be discharged with the help of an expectorant, or an expectoration mechanism can be set on the cushion body 1. Two fixing belts 3 are set in each group, which are easy to open and fixed by Velcro 31. At the same time, the fixing belt 3 is in the shape of an air bag, connected to the inner cavity of the cushion body 1, and is softer to avoid pressure injuries on the limbs. The inner side of the fixing belt 3 is also provided with a second protrusion 32 to ensure air permeability.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A back-type anti-pressure injury rollover air cushion, comprising an inflatable square cushion body (1) that can be carried on the back, wherein the middle of the inner cavity of the cushion body (1) is divided into two front and rear rollover cavities by a spacer so that the front and rear sides are alternately inflated, and the rollover cavity is connected to an inflation mechanism, characterized in that: The rollover cavity extends downward to form rollover parts (11) with triangular cross sections arranged on the left and right, and blowing holes (12) capable of blowing air to the back are evenly opened at the upper end of the rollover cavity; The front and rear ends of the cushion body (1) are provided with protective mechanisms for preventing excessive rollover, and the four corners of the upper end of the cushion body (1) are also provided with fixing mechanisms for fixing the limbs.

2. The back-type anti-pressure injury rollover air cushion according to claim 1, characterized in that: The inflation mechanism comprises a branch pipe (13) connected to the left end of the rollover chamber and a solenoid valve (14) arranged on the branch pipe (13); the ends of the two branch pipes (13) are connected through a main pipe, and the end of the main pipe is connected to an air pump (15) with a built-in battery; the two solenoid valves (14) are electrically connected to a controller to achieve alternating operation.

3. The back-type anti-pressure injury rollover air cushion according to claim 2, characterized in that: The pad body (1) is convexly formed into a plurality of parallel strip-shaped first protrusions (16).

4. The back-type anti-pressure injury rollover air cushion according to claim 3, characterized in that: The protective mechanism comprises four drawstrings (2) symmetrically connected to the front and rear ends of the cushion body (1), and the drawstrings (2) can be tied to the guardrails of the hospital bed.

5. The back-type pressure injury-preventing rollover air cushion according to claim 4, characterized in that: The fixing mechanism comprises four groups of fixing belts (3) for fixing the four limbs respectively, and each group of fixing belts (3) is provided with two opposite ones, and the ends of the two fixing belts (3) are connected by Velcro (31).

6. The back-type anti-pressure injury rollover air cushion according to claim 5, characterized in that: The fixing belt (3) is in the shape of an airbag whose inner cavity is connected to the cushion body (1).

7. The back-type pressure injury-preventing rollover air cushion according to claim 6, characterized in that: The inner side of the fixing belt (3) is raised to form a plurality of strip-shaped second protrusions (32).

8. The back-type anti-pressure injury rollover air cushion according to claim 1, characterized in that: It also comprises a safety valve mechanism connected to the right end of the cushion body (1) and which is deflated when the cushion body (1) is erected as the patient stands up.

9. The back-type anti-pressure injury rollover air cushion according to claim 8, characterized in that: The safety valve mechanism comprises a soft exhaust pipe (4) connected to the right end of the cushion body (1), and the end of the exhaust pipe (4) is connected to a piston cylinder (42) with an opening at the right end through two symmetrical branch pipes (41), and the piston cylinder (42) is provided with an exhaust hole corresponding to the branch pipe (41), and the exhaust hole is close to the left end of the piston cylinder (42) so that the right end can face downward when the piston cylinder (42) is vertically erected, and a piston block (43) capable of blocking the exhaust hole is installed in the piston cylinder (42), and a ventilation hole (44) penetrating left and right is provided in the middle of the piston block (43), and the left end of the piston block (43) is connected to the left end of the inner cavity of the piston cylinder (42) through a rubber strip (45).

10. The back-type anti-pressure injury rollover air cushion according to claim 9, characterized in that: The left end of the piston cylinder (42) is threadedly connected with a knob (46), and the left end of the rubber strip (45) is installed on the right end of the knob (46).

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