JPS63279845A - Bedsore preventing apparatus - Google Patents

Abstract

PURPOSE:To freely select the change of the wt. point of a receiving plate and to markedly enhance bedsore preventing effect, by providing a bidirectional shape memory metal allowing the leg of a movable body to reciprocally move in a guide cylinder. CONSTITUTION:A helical spring like bidirectional shape memory metal 9 is received in each guide cylinder 7 and the upper end thereof is engaged with the recessed part 6 of the leg 4 of a movable body 1 and the lower end thereof is fixed to the bottom of the guide cylinder 7. The movable body 1 is allowed to rise and fall by regulating the magnitude and current supply/stop timing of the current supplied to the memory metal 9 and the amplitude, wavelength, speed and the steepness degree of wave form of the approximate transversal wave drawn by the receiving plate of the movable body 1 are freely changed and the wt. point state of the receiving plate 2 is changed in the same way. By this change, the bedsore of the person, who lies down on the mat or sleeping mat 22 laid on the upper surface of the receiving plate 2 having a mushroom- shaped cross-section, is effectively prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention mainly relates to a bed sore prevention device for bedridden elderly people.

[Conventional technology]

The main cause of bedsores is that the same part of the body is under pressure from one's own body weight for a long time, leading to insufficient blood circulation in the area and the skin in that area becoming tight. There are many things. Therefore, in order to prevent bedsores in bedridden elderly people, etc., it is necessary to keep the skin properly dry and to occasionally change the body position by turning the person over in bed.

Normally, the above-mentioned tasks are carried out manually by nurses, but recently a bedsore prevention device using an air mattress has been devised. As shown in Figure 1O and Figure 11, the mat, which is a bag divided into several parts, alternately expands and contracts with air, changing the place where the weight is applied, and the air between each air mat. It blows air out of a nozzle to dry the skin appropriately.

[Problem that the invention seeks to solve]

There are devices that use air mattresses, such as those mentioned above, to save nurses' time and effort, but they only change the parts of the body that bear the weight (hereinafter referred to as emphasis) alternately over time. Of course, it is true that it is more effective to alternately change the weight than to support the weight at the same point, but the most desirable thing is to support each wave crest or point of a transverse wave with an appropriate wavelength and amplitude that occurs and advances continuously. This is optimal if the state is such that it corresponds to one after another. It is also necessary to be able to dry the skin appropriately. In addition, the air mat method requires an air pump, a solenoid valve, an air nozzle, an air pressure adjustment mechanism, etc. Since it uses air, the device must be airtight, requiring maintenance and being quite expensive.

In response to the above, the emphasis is shifted like the crest of a pseudo transverse wave,
Even if air is used, there is no need for special airtightness, and the aim is to easily control the wave crest propagation speed, amplitude (IJ (width of vertical displacement), wavelength (distance between points), etc.

[Means to solve the problem]

If the bed floor is partially moved up and down, or approximately like a transverse wave, the crests, or apexes, of each wave can be considered to be opposite to the point across the mat. The state in which the apex moves while partially vertically displacing is considered to be a transverse wave.To adjust the amplitude, wavelength, speed, etc. of the current, it is much easier to use a memory metal that generates heat and deforms through electric current than to use air. It is clear that

For this reason, memory metal is used in the present invention, whose basic operation is to partially raise and lower the bed floor.

This will be explained below.

An appropriate number of movable bodies are arranged in a portion corresponding to the bed floor. The movable body is composed of a receiving plate and a reinforcing arm leg, and the leg portion is supported by a memory metal attached in a hollow cylindrical guide tube having a bottom. By passing an electric current through the memory metal to raise its temperature and deform it, the movable legs are pushed up. The current is turned off and the memory metal is cooled with air, allowing it to return to its original shape. That is, the movable body is supported by the guide tube and the memory metal therein, and is also caused to move up and down. The vertical movement of each of the arranged movable bodies is made to approximate the progress of the crest of a transverse wave.

By doing so, each emphasis can be shifted as well.

A device is installed to control the current to the memory metal in order to make the movable body move as described above. The length of the receiving plate of the movable body is slightly shorter than the width of the bellow to which it is attached, and is perpendicular to the longitudinal direction of the stanchion.

The gaps between the receiving plates of the arranged movable bodies may be any gap that allows the movable bodies to move downward.

The receiving plate of the movable body has a flat upper surface and a cross section similar to that of a ``mushroom'', and is made of a somewhat hard material such as rubber.

There is a ventilation hole that penetrates from the legs to the receiving plate, and a separate fan sucks out (or blows) the air inside the guide cylinder, that is, it blows air through this ventilation hole.

Most of the memory metals are made of high electrical resistance, so they generate heat and deform just by passing an electric current through them. . Since the deformation time in this device is extremely slow, it can be used even at low voltages, and the set temperature can be set from room temperature to around 30"C. Also, the memory metal can be coated with a heat-resistant and electrically insulating material. If the movable body legs and guide tube are both made of an electrically insulating material or coated with the same, there will be no danger to humans.

[Effect]

The motion state of the receiving plate on the first surface of each Of moving body is the 61st m.
It is shown in FIG. Figure 6 shows when the memory metal is not deformed at all. FIG. 7 shows the important points P at this time, showing the points at which the positions of each receiving plate form one approximate transverse wave.

shall be. Figure 8 shows the displacement of each receiving plate after the passage of time, from town to P2. P, '→ indicates a transition to Fuku. The maximum vertical displacement amount of the receiving plate at this time is the distance between the α2 points, the transition speed of the 9 points is V, and the direction of the arrow is the transition direction. Figure 9 shows that by controlling the current to the memory metal, α
→ α′, entry → λ′, ■ → v′.

2 also shows the case where the direction of emphasis is changed.

〔Example〕

Specific examples of the present invention will be described with reference to the attached drawings.

FIG. 1 is a sectional view showing the entirety of the present invention, and shows a case where the movable body 1 is not displaced. That is, at this point, the upper surface of the receiving plate 2 and the upper surface of the bed floor 20 are substantially on the same plane. It is also an example diagram in which a helical spring-like memory metal 9 is used.

The movable body l is a receiving plate 2. It is composed of a reinforcing plate 31 and legs 4, which form a - body.

Figure 2 shows an example in which three memory metals 9 are used for one movable body, but there is no particular limit to the number of memory metals 9 used, as long as they can generate the force that lifts the emphasis by the required displacement amount. It is something. Also, l] of the receiving plate 2 is the number of movable bodies used for one bed.

This will be determined by the selection of priorities.

The movable body 1 has a receiving plate 2. Reinforcement plate 39 Ventilation hole 5 passing through leg 4
is open. This ventilation hole is a 7° guide pipe.
A fan (not shown) is passed through the mat 22 to help dry the mat by sucking (or blowing) air from the bottom surface of the mat 22, and if the mat is breathable, it will dry the skin of the person sleeping on it. It is also useful for drying.

The receiving plate 2 is made of a somewhat hard material such as rubber, that is, a material with appropriate elasticity and flexibility, and its cross section has a flat upper surface and a shape somewhat resembling the cross section of a ``mushroom'', as shown in Figure 3. . Both ends are thinner than the center.

When a force F is applied to the top surface, it bends as shown by the dotted line.

There is a reinforcing plate 3 in the center of the receiving plate, and a cylindrical leg 4 is attached to it. FIG. 2 is an example diagram in which one movable body has three legs.

The lower side of the leg 4 has a recessed part 6 into which the upper end of the memory metal 9 fits. In order to allow the legs 4 to smoothly move back and forth up and down in the guide tube 7 as the memory metal deforms, the contact surfaces between the two are made smooth. Movable legs 4.
Both the guide tube 7 and the guide tube 7 are made of an electrical insulator or have their surfaces coated with the same material. Further, a ventilation hole 8 is provided at the bottom of the guide tube 7 to connect a ventilation pipe 11 connected to a separately installed fan (not shown).

The helical spring-like memory metal 9 is housed in the guide tube 7, and its upper end is fitted into the recess 6 of the movable leg 4, and its lower end is fixed to the bottom of the guide tube 7.

It is also coated with a heat-resistant and electrically insulating material.

A power supply line 10 for energizing the memory metal 9 is connected to a separate control device (not shown). In principle, power is supplied to the memory metal attached to one movable body simultaneously and in series from the same power source.

When the memory metal 9 is energized and the temperature rises above A, it expands.

A material that shrinks back to its original state when the temperature drops is used, and the force of this stretching is used to push the movable body l upward. Then, by adjusting the magnitude of the current flowing through the memory metal of each movable base 9 and the timing of energization and stop, the receiving plate 2
The amplitude of the approximate transverse wave.

Wavelength, speed, waveform steepness, etc. can be changed freely.

This means that the state of the important point (P 4 p, ~P2) also changes in the same way.

In principle, air is sucked (or blown) into the guide tube 9 at all times when the movable body is in operation.

〔effect〕

By utilizing the deformation of the memory metal, it is safe for humans, and the emphasis can be freely selected, so the effect of preventing bedsores can be significantly enhanced, and the suction (or blowing) of air can dry the pine 1. Since it can be left in the same condition, it can be expected to have the effect of directly and indirectly preventing local overhumidification of the skin.

[Brief explanation of drawings]

Fig. fBf is a cross-sectional view of the present invention. Fig. 2 is a plan view in the direction of arrows x and -y in Fig. 1. Fig. 3 is a side view of the movable body. Fig. 4 is a plan view in the direction of arrows X2-Y2 in Fig. 3. Figure 5 is a sectional view of the guide cylinder. Figures 6 to 9 are illustrations of the operation of the movable body. Figures 10 and 11 are illustrations of the operation of the air mat. 3... Reinforcing plate of the receiving plate 4... Legs of the receiving plate 5... Ventilation holes penetrating the receiving plate and reinforcing legs 6... Four parts of the legs 7... Support guide tube 8. ... Guide tube bottom surface 8 Ventilation hole 9 ... Spiral spring-like memory metal 10 ... Power supply line to the memory metal 11 ... Ventilation vibe 20 ... Bed floor 21 ... Support member 22 ...・Mat or mattress pad P1~P2"-"Key point P1~ji...Key point P7~Key...Key point■...Wave traveling speed Arrow indicates direction α-・Maximum vertical displacement of the receiving plate B1~B-Air mat

Claims (1)

[Claims] 1. There is a movable body whose length is slightly shorter than the width of the bed, a suitable number of which are arranged perpendicularly to the longitudinal direction of the bed, and which can move up and down. The movable body has a receiving plate at the top, a reinforcing plate below it, and two to three legs for one movable body, and these are integrally constructed. The receiving plate is made of a material with appropriate elasticity and flexibility, has a flat top surface, and has a cross section similar to that of a mushroom. A mat or mattress is placed on the top surface of this receiving plate. Ventilation holes are provided through the receiving plate, reinforcing plate, and legs of the movable body. The legs of the movable body are inserted into a hollow cylinder with a bottom (hereinafter referred to as the guide tube), and a two-way shape memory metal (hereinafter referred to as memory metal) is attached between the bottom of the guide tube and the legs. This deformation of the memory metal allows the movable legs to reciprocate within the guide tube. A bedsore prevention device characterized by having a structure in which a movable body is supported by the guide tube and the memory metal. 2. There is also a ventilation hole at the bottom of the guide tube, which is connected to a separate fan. Further, the current flowing through each memory metal is controlled by a separate control device. That is, the memory metal is provided with a function that allows adjustment of the timing at which current is applied and stopped, and the strength of the current. A bedsore prevention device according to claim 1, which is characterized by being equipped with such a device.