Airbag wheelchair
By installing an airbag system on a wheelchair, periodically alternate filling and deflation are solved, and the bedsore problem caused by local continuous pressure in patients with wheelchair for a long time is achieved, and the effect of reducing the risk of bedsores and improving skin blood circulation is achieved.
Patent Information
- Application Number
- CN202421092904.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-05-17
AI Technical Summary
Patients who have been in wheelchairs for a long time are prone to bedsores because local persistent pressure causes blood supply to be blocked, affecting the health of the skin and tissues.
An airbag wheelchair is designed, using multiple strip airbags, air pumps, battery packs and valve control circuits, and the MOS tubes and solenoid valves are controlled through a timer, and the airbags in odd and even positions are periodically replaced and alternately charged and deflated to avoid Local long-term pressure.
It effectively reduces the risk of bedsores in wheelchair patients, and supports and ventilation through alternate filling and deflation, improving skin blood circulation and ventilation effects.
Smart Images
Figure CN222510489U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electrical technology, and more specifically to an airbag wheelchair. Background Art
[0002] This section is intended to provide a background or context to the embodiments of the present application as recited in the claims. The description herein is not admitted to be prior art as disclosed by inclusion in this section.
[0003] Bedsores, also known as pressure sores or pressure ulcers, are a common and serious complication in patients who are bedridden for a long time. Bedsores are mainly caused by damage to the skin and underlying tissues due to continuous pressure, and usually appear on bony protrusions of the body, such as the buttocks, heels, shoulder blades, pelvis, and elbows, because there is less soft tissue between the skin and bones in these areas, making them more susceptible to compression.
[0004] Sustained local pressure is a major reason why patients who sit in a wheelchair for a long time are prone to bedsores. When the skin and the soft tissues underneath are under pressure in the same position for a long time, the blood supply to the area is blocked. Normally, blood is responsible for transporting oxygen and essential nutrients to various parts of the body, while helping to remove metabolic waste. However, when the pressure is too great or lasts too long, blood vessels are compressed, resulting in reduced blood flow, which affects the health of the skin and the tissues underneath.
[0005] Sustained localized pressure will first cause a change in the color of the skin in the affected area, which may appear red or pale, indicating that blood circulation in the area has been affected. If the pressure persists, these areas of skin may further develop into painful sores, known as bedsores. Bedsores may only appear as lesions on the surface of the skin in the initial stage, but if not treated properly, they may deepen and spread to deeper tissue layers, even affecting muscles and bones.
[0006] In addition, the skin's oxygen and nutrient supply at the pressure point is insufficient, which reduces the skin's ability to maintain structure and function, and its ability to resist infection is also weakened, thereby increasing the risk of infection. Therefore, continuous local pressure not only causes tissue necrosis, but may also aggravate the condition due to secondary infection.
[0007] In order to prevent and alleviate bedsores caused by local continuous pressure, wheelchair users need to change their sitting positions frequently. However, patients who sit in wheelchairs for a long time (such as paralyzed patients) often have no ability to change their sitting positions, so a wheelchair that can automatically avoid local continuous pressure is needed. Summary of the invention
[0008] The purpose of the present application is to provide an airbag wheelchair, which reduces the risk of bedridden patients developing bedsores.
[0009] The present application discloses an airbag wheelchair, comprising a wheelchair, a plurality of strip-shaped airbags, an air pump, a battery pack and a valve control circuit, wherein the valve control circuit comprises a plurality of MOS tubes, a timer, a NOT gate and a plurality of solenoid valves;
[0010] The plurality of strip-shaped airbags are arranged in parallel and transversely on the side of the backrest and the seat cushion of the wheelchair that contacts the body, wherein the strip-shaped airbags at odd-numbered positions are connected to the first connecting channel at one side, one end of the first connecting channel is connected to the first solenoid valve, and the other end passes through the second solenoid valve to communicate with the air outlet of the air pump; the strip-shaped airbags at even-numbered positions are connected to the second connecting channel at the other side, one end of the second connecting channel is connected to the third solenoid valve, and the other end passes through the fourth solenoid valve to communicate with the air outlet of the air pump;
[0011] The timer outputs a periodic square wave; the output end of the timer is respectively connected to the gate of the first MOS tube, and is connected to the gate of the second MOS tube through a NOT gate; the source electrodes of the two MOS tubes are connected to the positive electrode of the battery pack; the battery pack is connected in parallel with the air pump; the drain electrode of the first MOS tube is respectively connected to the first power supply end of the first solenoid valve and the fourth solenoid valve, the drain electrode of the second MOS tube is respectively connected to the first power supply end of the second solenoid valve and the third solenoid valve, and the second power supply end of the multiple solenoid valves is connected to the negative electrode of the battery pack. In a preferred example, when the timer outputs a high level, the first MOS tube is turned on, the first solenoid valve and the fourth solenoid valve are turned on, the NOT gate converts the output of the timer to a low level, the second MOS tube is turned off, the second solenoid valve and the third solenoid valve are closed, the air pump inflates the strip airbags at the even-numbered positions, and the strip airbags at the odd-numbered positions are deflated through the first solenoid valve; the strip airbags at the even-numbered positions play a supporting role after being filled with air, and the strip airbags at the odd-numbered positions collapse after being deflated to form a ventilation channel;
[0012] When the timer outputs a low level, the first MOS tube is turned off, the first solenoid valve and the fourth solenoid valve are closed, the NOT gate converts the output of the timer into a high level, the second MOS tube is turned on, the second solenoid valve and the third solenoid valve are opened, the air pump inflates the strip airbags at the odd-numbered positions, and the strip airbags at the even-numbered positions are deflated through the third solenoid valve; the strip airbags at the odd-numbered positions play a supporting role after being filled with air, and the strip airbags at the even-numbered positions collapse after being deflated to form a ventilation channel.
[0013] In a preferred embodiment, when the air pump reaches a preset pressure value, the air pressure remains stable.
[0014] In a preferred example, the two MOS tubes (501.1, 501.2) are power MOS tubes.
[0015] In a preferred example, the timer (502) is a 555 timer.
[0016] In a preferred example, in each cycle output by the timer (502), the duration of the high level and the duration of the low level are equal, and the total duration of each cycle ranges from 5 to 15 minutes.
[0017] In a preferred example, the multiple solenoid valves (504.1, 504.2, 504.3, 504.4) are normally closed solenoid valves, which are in a closed state when not powered on and in an open state when powered on.
[0018] In a preferred embodiment, the position where the airbag contacts the body is made of a material with good air permeability and excellent moisture absorption and perspiration discharge performance.
[0019] In a preferred example, a battery switch (402) is further included, wherein the battery switch (402) is connected between the battery pack (401) and the input end of the timer (502), the input end of the air pump (3), the source of the first MOS transistor (501.1), and the source of the second MOS transistor (501.2), and controls the battery pack (401) to supply power to the air pump (3) and the valve control circuit (5).
[0020] Compared with the prior art, the main differences and effects of the embodiments of the present application are:
[0021] The present application can periodically alternately inflate and deflate the strip airbags at odd-numbered positions and the strip airbags at even-numbered positions, thereby preventing a certain part from being in a state of pressure for a long time, thereby effectively reducing the risk of wheelchair patients developing bedsores.
[0022] Furthermore, some of the airbags are always inflated to provide continuous support and good comfort, while the other part of the airbags are emptied to form a ventilation channel, so that the skin above the emptied airbags is in contact with the air, and the ventilation effect is good.
[0023] It should be understood that within the scope of this application, the above-mentioned technical features of this application and the technical features specifically described below (such as embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0025] Figure 1 It is a schematic diagram of an airbag wheelchair according to one embodiment of the present application.
[0026] Figure 2 It is a schematic diagram of the circuit structure in one embodiment of the present application.
[0027] Figure 3 It is a schematic diagram of the structural relationship between the airbag and the valve in one embodiment of the present application.
[0028] Figure 4 It is a schematic diagram of a periodic square wave signal output by a timer according to the present application.
[0029] In the accompanying drawings, the symbols are as follows:
[0030] 1- Wheelchair;
[0031] 201- Strip-shaped water bladders at odd positions;
[0032] 202-strip water bladders at even-numbered positions;
[0033] 3-Air pump;
[0034] 401-battery pack;
[0035] 402-battery switch;
[0036] 5-valve control circuit;
[0037] 501.1- first MOS tube;
[0038] 501.2- second MOS tube;
[0039] 502-Timer;
[0040] 503-NOT gate;
[0041] 504.1-First solenoid valve;
[0042] 504.2-Second solenoid valve;
[0043] 504.3-Third solenoid valve;
[0044] 504.4-Fourth solenoid valve. DETAILED DESCRIPTION
[0045] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.
[0046] In order to make the objectives, technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.
[0047] In one embodiment of the present application, an airbag wheelchair is disclosed in the present application. Figure 1 As shown, the wheelchair comprises a wheelchair 1, a plurality of strip-shaped airbags 201, 202, an air pump 3, a battery pack 401 and a valve control circuit 5; wherein, as Figure 2 As shown, the valve control circuit 5 includes a plurality of MOS tubes 501.1, 501.2, a timer 502, a NOT gate 503 and a plurality of solenoid valves 504.1, 504.2, 504_3, 504.4. Figure 1 It is just a schematic diagram. In order to more prominently show the positions of the strip airbags 201, 202, the proportions of the wheels of the wheelchair 1 are appropriately adjusted, especially the size of the rear wheel is smaller than the actual size.
[0048] like Figure 3 As shown, a plurality of strip-shaped airbags 201 and 202 are arranged in parallel and transversely on the side of the backrest and the seat cushion of the wheelchair 1 that contacts the body, wherein the strip-shaped airbags 201 at odd positions are connected to the first connection channel 203.1 at one side, one end of the first connection channel 203.1 is connected to the first electromagnetic valve 504.1, and the other end passes through the second electromagnetic valve 504.2 to communicate with the air outlet of the air pump 3; the strip-shaped airbags 202 at even positions are connected to the second connection channel 203.2 at the other side, one end of the second connection channel 203.2 is connected to the third electromagnetic valve 504_3, and the other end passes through the fourth electromagnetic valve 504.4 to communicate with the air outlet of the air pump 3. In the drawings of the present application, 201 refers to all the strip-shaped airbags at odd positions, and 202 refers to all the strip-shaped airbags at even positions. In the drawings, not every strip-shaped airbag may be marked with 201 or 202.
[0049] like Figure 4 As shown, timer 502 outputs a periodic square wave; combined Figure 2 , the output end of the timer 502 is respectively connected to the gate of the first MOS tube 501.1, and is connected to the gate of the second MOS tube 501.2 through the NOT gate 503; the source electrodes of the two MOS tubes 501.1 and 501.2 are connected to the positive electrode of the battery pack 401; the battery pack 401 is connected in parallel with the air pump 3; the drain electrode of the first MOS tube 501.1 is respectively connected to the first power supply ends of the first solenoid valve 504.1 and the fourth solenoid valve 504.4, the drain electrode of the second MOS tube 501.2 is respectively connected to the first power supply ends of the second solenoid valve 504.2 and the third solenoid valve 504.3, and the second power supply ends of the multiple solenoid valves 504.1, 504.2, 504.3, and 504.4 are connected to the negative electrode of the battery pack 401.
[0050] Optionally, in one embodiment, in combination Figure 2 and Figure 3 When the timer 502 outputs a high level, the first MOS tube 501.1 is turned on, the first solenoid valve 504.1 and the fourth solenoid valve 504.4 are turned on, the NOT gate 503 converts the output of the timer 502 into a low level, the second MOS tube 501.2 is turned off, the second solenoid valve 504.2 and the third solenoid valve 504_3 are closed, the air pump 3 inflates the strip airbags 202 at the even-numbered positions, and the strip airbags 201 at the odd-numbered positions are deflated through the first solenoid valve 504.1; the strip airbags 202 at the even-numbered positions play a supporting role after being filled with air, and the strip airbags 201 at the odd-numbered positions collapse after being deflated to form a ventilation channel.
[0051] When the timer 502 outputs a low level, the first MOS tube 501.1 is turned off, the first solenoid valve 504.1 and the fourth solenoid valve 504.4 are closed, the NOT gate 503 converts the output of the timer 502 into a high level, the second MOS tube 501.2 is turned on, the second solenoid valve 504.2 and the third solenoid valve 504.3 are opened, the air pump 3 inflates the strip airbags 201 at the odd-numbered positions, and the strip airbags 202 at the even-numbered positions are deflated through the third solenoid valve 504.3; the strip airbags 201 at the odd-numbered positions play a supporting role after being filled with air, and the strip airbags 202 at the even-numbered positions collapse after being deflated to form a ventilation channel.
[0052] Optionally, in one embodiment, the working process of the present application is:
[0053] In the first cycle, the timer 502 outputs a high level, the first solenoid valve 504.1 and the fourth solenoid valve 504.4 are opened, the second solenoid valve 504.2 and the third solenoid valve 504.3 are closed, the strip airbags 202 at the even-numbered positions are inflated, and the strip airbags 201 at the odd-numbered positions are deflated.
[0054] In the second cycle, the timer 502 outputs a low level, the first solenoid valve 504.1 and the fourth solenoid valve 504.4 are closed, the second solenoid valve 504.2 and the third solenoid valve 504.3 are opened, the strip airbags 202 at the odd-numbered positions are inflated, and the strip airbags 201 at the even-numbered positions are deflated.
[0055] High level and low level are terms in the field of electronic circuits, referring to relatively high and low levels. Optionally, in one embodiment, the high level may be the level of the positive electrode of the battery pack, and the low level may be the level of the negative electrode of the battery pack.
[0056] Table 1 Timer voltage and solenoid valve opening and closing
[0057] Timer voltage First solenoid valve Second solenoid valve The third solenoid valve Fourth solenoid valve Low level × √ √ × High level √ × × √
[0058] In this way, the strip airbags 201 at odd-numbered positions and the strip airbags 202 at even-numbered positions are alternately inflated and deflated, thereby alternately providing support force for the patient.
[0059] Optionally, in one embodiment, when the air pump 3 reaches a preset pressure value, the air pressure remains stable, so that the strip-shaped airbags 201 and 202 that play a supporting role in the current cycle maintain a static state for a period of time.
[0060] Optionally, in one embodiment, the two MOS transistors 501.1 and 501.2 are power MOS transistors.
[0061] Optionally, in one embodiment, the timer 502 adopts a 555 timer.
[0062] Optionally, in one embodiment, in each cycle output by the timer 502, the duration of the high level and the duration of the low level are equal, and the total duration of each cycle ranges from 5 to 15 minutes.
[0063] Optionally, in one embodiment, the plurality of solenoid valves 504.1, 504.2, 504.3, and 504.4 are normally closed solenoid valves, which are in a closed state when not powered on and in an open state when powered on.
[0064] Optionally, in one embodiment, the position where the airbag contacts the body is made of a material with good breathability and excellent moisture absorption and perspiration management properties.
[0065] Optionally, in one embodiment, a battery switch 402 is further included, and the battery switch 402 is connected between the battery pack 401 and the input end of the timer 502, the input end of the air pump 3, the source of the first MOS transistor 501.1, and the source of the second MOS transistor 501.2, and controls the battery pack 401 to supply power to the air pump 3 and the valve control circuit 5. The battery switch 402 can control the power supply of the entire charging and discharging system, and can turn off the power supply to save electricity when charging and discharging is not needed.
[0066] Optionally, in one embodiment, the battery pack 401 may be a rechargeable battery, such as a lithium-ion rechargeable battery, a sodium-ion rechargeable battery, or a lead-acid battery.
[0067] It should be noted that in the claims and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0068] All documents mentioned in this application are cited as references in this application, just as each document is cited as reference individually. In addition, it should be understood that after reading the above teaching content of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope defined by the claims attached to this application.
Claims
1. An airbag wheelchair, characterized in that: The invention comprises a wheelchair (1), a plurality of strip-shaped airbags (201, 202), an air pump (3), a battery pack (401) and a valve control circuit (5), wherein the valve control circuit (5) comprises a plurality of MOS tubes (501.1, 501.2), a timer (502), a NOT gate (503) and a plurality of solenoid valves (504.1, 504.2, 504.3, 504.4); The plurality of strip-shaped airbags (201, 202) are arranged in parallel and transversely on the side of the backrest and seat cushion of the wheelchair (1) that contacts the body, wherein the strip-shaped airbags (201) at odd-numbered positions are connected to the first connecting channel (203.1) at one side, one end of the first connecting channel (203.1) is connected to the first solenoid valve (504.1), and the other end passes through the second solenoid valve (504.2) to communicate with the air outlet of the air pump (3); the strip-shaped airbags (202) at even-numbered positions are connected to the second connecting channel (203.2) at the other side, one end of the second connecting channel (203.2) is connected to the third solenoid valve (504.3), and the other end passes through the fourth solenoid valve (504.4) to communicate with the air outlet of the air pump (3); The timer (502) outputs a periodic square wave; the output end of the timer (502) is respectively connected to the gate of the first MOS tube (501.1), and is connected to the gate of the second MOS tube (501.2) through a NOT gate (503); the source electrodes of the two MOS tubes (501.1, 501.2) are connected to the positive electrode of the battery pack (401); the battery pack (401) is connected in parallel with the air pump (3); the drain electrode of the first MOS tube (501.1) is respectively connected to the first power supply ends of the first solenoid valve (504.1) and the fourth solenoid valve (504.4), the drain electrode of the second MOS tube (501.2) is respectively connected to the first power supply ends of the second solenoid valve (504.2) and the third solenoid valve (504.3), and the second power supply ends of the multiple solenoid valves (504.1, 504.2, 504.3, 504.4) are connected to the negative electrode of the battery pack (401).
2. The airbag wheelchair according to claim 1, characterized in that: The two MOS tubes (501.1, 501.2) are power MOS tubes.
3. The airbag wheelchair according to claim 1, characterized in that: The timer (502) adopts a 555 timer.
4. The airbag wheelchair according to claim 1, characterized in that: In each cycle output by the timer (502), the duration of the high level and the low level are equal, and the total duration of each cycle ranges from 5 to 15 minutes.
5. The airbag wheelchair according to claim 1, characterized in that: The multiple solenoid valves (504.1, 504.2, 504.3, 504.4) are normally closed solenoid valves, which are in a closed state when not powered on and in an open state when powered on.
6. The airbag wheelchair according to any one of claims 1 to 5, characterized in that: The position where the airbag contacts the body is made of a material with breathable, moisture absorbing and perspiration wicking properties.
7. The airbag wheelchair according to any one of claims 1 to 5, characterized in that: It also comprises a battery switch (402), the battery switch (402) being connected between the battery pack (401) and the input end of the timer (502), the input end of the air pump (3), the source of the first MOS transistor (501.1), and the source of the second MOS transistor (501.2), and controlling the battery pack (401) to supply power to the air pump (3) and the valve control circuit (5).