TWI805014B - System for detecting pressure under mattress - Google Patents

Abstract

A system for detecting pressure under mattress is disclosed. The system includes a first weight detection pad, a signal processing circuit and a second weight detection pad. The first weight detection pad includes a first flexible protective pad body, a first weight detection set, a second weight detection set, a third weight detection set, and a fourth weight detection set. The second weight detection pad includes a second flexible protective pad body, a fifth weight detection set, and a sixth weight detection set. With the design of the above technical components, the system can be placed below the mattress to observe the position of the care recipients and obtain their physiological information, but does not cause uncomfortable conditions. In addition, the installation and calibration of the technical components of the system are very convenient, which solves the existing problems of related technologies.

Description

Mattress Under Pressure Detection System

The present invention relates to a pressure detection system, especially a pressure detection system under a mattress, which can sense the posture of a user on the mattress and collect relevant physiological information.

With declining birth rates and rising average ages, the populations of most developed countries today are inevitably aging. Coupled with fierce social competition, people cannot have leisure time to take care of the elderly and disabled relatives as in the past. These people need long-term care social welfare to support them. When dealing with care recipients who need to stay in bed for a long time or are elderly and infirm, it is best to monitor their every move effectively to avoid accidents, such as sudden death due to sleep apnea, or not paying attention when getting out of bed And fell.

In order to achieve the above objectives, many technologies for bed monitoring have emerged as the times require. For example, the invention patent No. I733508 of the Republic of China discloses a stand-up care detection system, which includes: an optical fiber sensing pad, which is suitable for the person being cared to lie on; The pressure is an optical signal; the photoelectric conversion module, coupled with the optical fiber sensing module, converts the optical signal into a measurement signal, and then sends it to the signal processing module; the signal processing module analyzes the measurement signal and according to the measurement signal Wave pattern features can be used to judge turning events, back slapping events, or lying states. The patented optical fiber sensing pad needs to be directly placed between the care receiver and the mattress, which makes the care receiver feel bad when lying down. On the other hand, optical fibers are prone to breakage due to stress, leading to equipment failure. In addition, the patent can also track some physiological information of the care recipient, such as breathing status.

Another known technology related to the above-mentioned purpose is disclosed in the new patent No. M521236 of the Republic of China, a digital weight-reduction type bed-leaving and position alarm system equipment, which includes digital weighing elements of the electronic load cell, and weighs the main body Increase and decrease the weight component to display the alarm signal to achieve the function of detecting the bed leaving and position signal alarm. It includes the electronic load cell and the main body fixing plate, which are fixed on the bottom support of the bed board, so that it has the function of loading and setting the weight. Through the electronic The digital weight loss signal of the load generates an alarm signal output for leaving the bed and position, which is directly transmitted to the programmable controller, and then the signal is transferred from the programmable controller to the data unit controller for reception, and then transmitted to the central system controller via WiFi to receive and connect to the monitor. At the same time, it will be forwarded to the set mobile phone alarm display of the medical staff, so that the medical staff can receive the alarm signal no matter where they are in any work area, and display the instant message of the alarm that the care receiver who knows the set care area leaves the bed and is in position. Effectively reduce the risk rate of the care receiver's voluntary bed-leaving action, and protect the safety of the care receiver's voluntary bed and position. However, the electronic load cell and the main body fixing plate of this technology must be installed at the bottom of the bed, which is very inconvenient for calibration. In addition, because the monitoring object is the change of the center of gravity of the upper and lower body of the human body, many posture changes of the human body, such as changing from lying on the left to lying on the right, may not be obvious and will be ignored by the system.

Based on the above analysis, the existing technologies for detecting the position of the care recipient on the bed either cause discomfort to the care recipient or have various inconveniences in use. Therefore, it is necessary to develop a novel pressure detection system to solve the above problems.

This paragraph extracts and compiles certain features of the present invention. Other features will be disclosed in subsequent paragraphs. It is intended to cover various modifications and similar arrangements within the spirit and scope of the appended claims.

In order to solve the above problems, the present invention discloses a mattress pressure detection system, including: a first weight detection pad, installed under the mattress, corresponding to the position between the back and the buttocks when the human body is in a lying position, including Including: a first flexible protective pad body; a first weight detection combination, fixed inside the first flexible protective pad body, detects the weight exerted by the mattress on the left side of the human body's back, and detects the weight through the continuous output of electrical signals The weight value; a second weight detection combination, fixed inside the first flexible protective pad body, detects the weight exerted by the central part of the back of the human body through the mattress, and continuously outputs the detected weight value with electrical signals; The third weight detection combination, fixed inside the first flexible protective pad, detects the weight exerted by the right back of the human body through the mattress, and continuously outputs the detected weight value with electrical signals; and a fourth weight detection A combination, fixed inside the first flexible protective pad body, detects the weight exerted by the human buttocks through the mattress, and continuously outputs the detected weight value with electrical signals; and a signal processing circuit, and the first weight detection circuit The combination, the second weight detection combination, the third weight detection combination and the fourth weight detection combination are electrically connected to convert the received electrical signals into corresponding weight values, and the position of the weight value source Judging the posture of the human body, and separating the time points of heartbeat and respiration with stable periodic changes caused by heartbeat or respiration from these electrical signals.

The pressure detection system under the mattress may further include a second weight detection pad, installed under the mattress, corresponding to the position between the thigh and the calf when the human body is in a lying position, including: a second flexible protective pad; A fifth weight detection combination, fixed inside the second flexible protective pad and electrically connected to the signal processing circuit, detects the weight exerted by the human thigh through the mattress, and continuously outputs the detected weight value with electrical signals ; and a sixth weight detection combination, fixed inside the second flexible protective pad and electrically connected to the signal processing circuit, detecting the weight exerted by the human calf through the mattress, and continuously outputting the detected weight with electrical signals weight value. The signal processing circuit further judges the posture of the human body according to the change of the weight value from the fifth weight detection combination and the sixth weight detection combination.

The first weight detection combination, the second weight detection combination and the third weight detection combination may further include: two load gauges, each load gauge is deformed by force in a first main detection direction, And through the deformation to cause the corresponding resistance change; an electronic detection meter, through the change of the current between the two load gauges to obtain the resistance change, and reverse the corresponding deformation and force of each load gauge according to the aforementioned resistance change, And the sum of the force of the two load gauges is output as a weight value and an electrical signal; the second first pressure plate has a corresponding The same symmetrical shape, the symmetrical shape has a first axis of symmetry, the two load gauges are installed between the two first pressure bearing plates, and are located at corresponding positions on both sides of the first axis of symmetry, between the two first pressure bearing plates The force can be transmitted to at least one of the two load gauges; and the two first tension rivets are respectively movably fixed on the same side of the two first pressure bearing plates on the first axis of symmetry, so that the two first bearing plates The deformation of the pressure plate on one side is limited to the allowable range of the corresponding first tension rivet. The first main detection direction is parallel to the first axis of symmetry.

The fourth weight detection combination, the fifth weight detection combination and the sixth weight detection combination may further include: two load gauges, each load gauge is deformed by force in a second main detection direction, And through the deformation to cause the corresponding resistance change; an electronic detection meter, through the change of the current between the two load gauges to obtain the resistance change, and reverse the corresponding deformation and force of each load gauge according to the aforementioned resistance change, And the sum of the force of the two load gauges is output as a weight value with an electrical signal; the two second pressure bearing plates have the same symmetrical shape, and the symmetrical shape has a second axis of symmetry, and one of the two load gauges is installed on the second Between the second pressure bearing plates, located on the second axis of symmetry, the force of the two first pressure bearing plates can be transmitted to one of the two load gauges; the two third pressure bearing plates have the same symmetrical shape, and the two third pressure bearing plates have the same symmetrical shape. The symmetrical shape has a third axis of symmetry, and the other of the two load gauges is installed between the two third pressure bearing plates on the third axis of symmetry, and the force of the two third pressure bearing plates can be transmitted to the two load gauges The other; two second tension rivets are respectively movably fixed on the same side of the two second pressure bearing plates on the second axis of symmetry, so that the deformation of the two second pressure bearing plates on one side is limited to the corresponding within the allowable range of the second tension-limiting rivet; and two third tension-limiting rivets, respectively movably fixed on the same side of the two third pressure-bearing plates on the third axis of symmetry, so that the two third pressure-bearing plates are in a The deformation of the side is limited to the allowable range of the corresponding third tension rivet. The load gauge installed between the two second pressure bearing plates, its second main detection direction is parallel to the second axis of symmetry; the load gauge installed between the two third pressure bearing plates, its second main detection direction Parallel to the third axis of symmetry; the two second pressure bearing plates and the two third pressure bearing plates are installed on both sides of the first flexible protective pad or the second flexible protective pad respectively.

Preferably, the first flexible protective pad body and the second flexible protective pad body are made of thermoplastic polyurethane (Thermoplastic Polyurethane, TPU) or polyvinyl chloride (Polyvinyl Chloride, PVC).

Preferably, the pressure bearing plates are made of polyethylene terephthalate (PET) or polypropylene (PP).

Preferably, the length of the shorter sides of the pressure bearing plates is not less than 10 cm.

Preferably, between the pressure bearing plates, a plurality of sponge blocks are further bonded at the corners.

According to the present invention, if the weight value detected by the first weight detection combination is more than 20% greater than the weight value detected by the third weight detection combination, the human body is in the left sleeping position; if the third weight detection combination If the weight value detected by the detection combination is greater than the weight value detected by the first weight detection combination by more than 20%, the human body is in the right sleeping position; if the first weight detection combination, the second weight detection combination If the sum of the weight values detected by the third weight detection combination continues to decrease and the weight value detected by the fourth weight detection combination continues to increase, the human body is in an upward sleeping position; if the first weight detection combination, the sum of the weight values detected by the second weight detection combination and the third weight detection combination decreases close to zero and the weight detected by the fourth weight detection combination increases to a peak value, then the human body is in sitting posture.

According to the present invention, if the sum of the weight values detected by the first weight detection combination, the second weight detection combination and the third weight detection combination decreases close to zero, the fourth weight detection combination detects If the detected weight increases to a peak value and then falls back, and the weight values detected by the fifth weight detection combination and the sixth weight detection combination are close to zero, the human body is in the state of getting out of bed.

With the design of the above technical components, the system can be placed under the mattress to observe the position of the care recipient and obtain their physiological information without causing discomfort. In addition, the installation and correction of the technical components of the system are very convenient, which solves the existing problems of the related technology.

1: Mattress

2: Human body

3: bed

10: The first weight detection pad

11: The first flexible protective pad

111: Mounting ring

112: opening

12: The first weight detection combination

121: load gauge

122: Electronic Detector

123: The first bearing plate

124: The first tension rivet

125: sponge block

13: The second weight detection combination

14: The third weight detection combination

15: The fourth weight detection combination

151: The first load gauge group

1511: load gauge

1512: The second pressure plate

1513: Second tension rivet

152: Second load gauge group

1522: The third pressure plate

1523: The third tension rivet

153: Electronic Detector

154: sponge block

20: Signal processing circuit

30:Second weight detection pad

31: The second flexible protective pad body

311: Mounting ring

312: opening

32: Fifth weight detection combination

33: The sixth weight detection combination

D1: allowable range

D2: Permissible range

O: open

FIG. 1 is a component diagram of a mattress down pressure detection system according to an embodiment of the present invention.

FIG. 2 shows the state of the mattress pressure detection system being laid under a mattress.

Fig. 3 is a top view of a first weight detection combination.

FIG. 4 is a cross-sectional view of the first weight detection assembly along a first axis of symmetry.

Figure 5 is a top view of two load gauge groups.

Fig. 6 is a cross-sectional view of a first load cell group along a second axis of symmetry.

FIG. 7 shows the time points of heartbeat and respiration with stable periodic changes caused by heartbeat or respiration separated from the weight value detected by the first weight detection combination.

Fig. 8 shows the relative position between the human body on the mattress and the pressure detection system under the mattress when it is in the left sleeping position.

Figure 9 shows the relative positions of the human body on the mattress in the supine sleeping position and the third flexible protective pad under the mattress, the fourth weight detection combination, the fifth weight detection combination and the sixth weight detection combination .

Fig. 10 shows the relative positions of the human body on the mattress and the third flexible protective pad, the fourth weight detection combination, the fifth weight detection combination and the sixth weight detection combination under the mattress when the human body is in a sitting position.

The present invention will be described more specifically by referring to the following embodiments.

Please refer to FIG. 1 , which is a component diagram of a mattress down pressure detection system (hereinafter referred to as the system) according to an embodiment of the present invention. The system includes a first weight detection pad 10 , a signal processing circuit 20 and a second weight detection pad 30 . The technical architecture and interaction patterns of the aforementioned components, as well as the operation mode of the system, will be described in detail below.

Please also refer to FIG. 2 , which shows how the system is laid under a mattress 1 . The first weight detection pad 10 is installed under the mattress 1 and corresponds to the position between the back and the buttocks when the human body 2 is in a lying position. In Fig. 2, because the system cannot be viewed directly from above under the mattress 1, it is shown with a dotted line. The first weight detection pad 10 includes: a first flexible protective pad body 11, a first weight detection combination 12, a second weight detection combination 13, a third weight detection combination 14 and a fourth weight Detection combination 15. The first flexible protective pad body 11 is the outermost element of the first weight detection pad 10, which can protect the first weight detection combination 12, the second weight detection combination 13, the third weight detection combination 14 and the first weight detection combination therein. Four weight detection combination15. According to the present invention, the first flexible protective pad The body 11 is made of polyvinyl chloride (Polyvinyl Chloride, PVC). In practice, thermoplastic polyurethane (TPU) can also be used. The upper and lower pieces of TPU are formed after cutting and hot pressing. They have a certain degree of flexibility, can be bent, and can also be waterproof. Because the first flexible protective pad body 11 has flexibility, when the first flexible protective pad body 11 is bent, the first weight detection combination 12, the second weight detection combination 13, the third weight detection combination 14 and the fourth weight detection combination The distance between the weight detection assemblies 15 can be adjusted, so the first weight detection pad 10 can be applied to human bodies 2 with different upper body lengths. In addition, the edge portion of the first flexible protective pad body 11 can have a plurality of mounting rings 111, which can be connected with the fixing elements of the bed (not shown), so as to fix the relative position of the first flexible protective pad body 11 and the bed. Misalignment occurs due to the movement of the user. A plurality of openings 112 can also be set inside the first flexible protective pad body 11, so that the first flexible protective pad body 11 can cut off many unnecessary TPU parts, so that these weight detection combinations can be more closely bonded to the two sides. between the rest of the slice TPU.

The first weight detection assembly 12 is fixed inside the first flexible protective pad body 11, and is used to detect the weight exerted by the mattress 1 on the left side of the back of the human body 2, and continuously output the detected weight value with electrical signals. Similarly, the second weight detection assembly 13 is also fixed inside the first flexible protective pad body 11 to detect the weight exerted by the central part of the back of the human body 2 through the mattress 1, and continuously output the detected weight value with electrical signals The third weight detection combination 14 is also fixed inside the first flexible protective pad body 11, and is used to detect the weight applied by the right side of the back of the human body 2 through the mattress 1, and continuously output the detected weight value with electrical signals. Since each weight detection combination can detect part of the weight of the human body 2 above the mattress 1 , it will also detect part of the weight of the mattress 1 . Therefore, in operation, the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 can be reset to zero before use, so as to remove the weight of the mattress 1, so that the readings can directly reflect the human body 2 corresponds to the weight exerted partially through the mattress 1. The zeroing operations of the fourth weight detection combination 15 , the fifth weight detection combination 32 and the sixth weight detection combination 33 which will be introduced later are also the same.

The first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 have the same structure, and the first weight detection combination 12 is used as an example to illustrate, please refer to Fig. 3 and Fig. 4, Fig. 3 for the first weight The top view of the detection combination 12, Fig. 4 is a sectional view of the first weight detection combination 12 along a first symmetry axis (the top is the situation that the first weight detection combination 12 is not stressed, and the bottom is the first weight detection Combination 12 is in the state of eccentric force), the first axis of symmetry is the dotted line in Fig. 3 . The first weight detection assembly 12 includes two load gauges 121 , an electronic detection gauge 122 , two first pressure bearing plates 123 , two first tension-limiting rivets 124 and four sponge blocks 125 . Each load gauge 121 includes a resistive strain gauge (not shown), which is deformed by force in a first main detection direction, and causes a corresponding resistance change through the deformation. That is to say, if an external force causes deformation on the load gauge 121, the deformation is more sensitive in the first main detection direction, and the closer the deformation direction is perpendicular to the first main detection direction, the less sensitive it is instead of the load gauge 121 reading. less than any value. Electronic detector 122 is a special circuit, which can apply voltage to two load gauges 121, and obtain its resistance change through the change of current between the two load gauges 121, so that each load gauge can be deduced according to the aforementioned resistance change 121’s corresponding deformation and force, and the sum of the force of the two load gauges 121 is output as a weight value to the signal processing circuit 20 as an electrical signal. The two first pressure bearing plates 123 have the same symmetrical shape, and the symmetrical The shape has the aforementioned first axis of symmetry. In this embodiment, the symmetrical shape is a rectangle with four corners leading sides. The two load gauges 121 are installed between the two first pressure bearing plates 123 at corresponding positions on both sides of the first axis of symmetry. When the two first pressure bearing plates 123 are deformed by force, the force of the two first pressure bearing plates 123 can be transmitted to at least one of the two load gauges 121 . That is to say, the total amount of forces acting on the two first pressure bearing plates 123 can be accurately detected through summation. The two first tension-limiting rivets 124 are respectively movably fixed on the same side (left side or right side) of the two first pressure bearing plates 123 on the first axis of symmetry, so that the two first pressure bearing plates 123 on one side The deformation is only limited within the allowable range D1 of the corresponding first tension rivet 124 . Please see Figure 4. When the first weight detection assembly 12 is under the condition of eccentric force, that is, the resultant force point is not on the load cell 121 , the first pressure bearing plate 123 will be deformed. In order to avoid excessive deformation of the first pressure bearing plate 123 and contact with the non-load gauge 121, such as another first pressure bearing plate 123, which will cause distortion of the readings of the load gauge 121, so the first tension rivet 124 is designed. .

Creep or stress fatigue will occur to the first pressure bearing plate 123 after a long time of use, resulting in its deformation. Therefore, the four sponge blocks 125 bonded at the corners between the first pressure bearing plates 123 can support the first pressure bearing plate 123 with a slight force, reducing the extent of this situation.

The fourth weight detection unit 15 is fixed inside the first flexible protective pad body 11 and is used to detect the weight exerted by the buttocks of the human body 2 through the mattress 1, and continuously output the detected weight value with electrical signals. The structure of the fourth weight detection combination 15 is slightly different from the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14, but it is the same as the fifth weight detection combination mentioned later 32 is the same as the sixth weight detection combination 33. Please refer to FIG. 5 and FIG. 6, FIG. 5 is a top view of the first load gauge set and the second load gauge set, and FIG. 6 is a cross-sectional view of the first load gauge set along a second axis of symmetry (dashed line at the top of FIG. 5). Taking the fourth weight detection combination 15 as an example, it includes a first load gauge set 151 , a second load gauge set 152 and an electronic detection gauge 153 . More subdivided, the fourth weight detection combination 15 includes 2 load gauges 1511, 2 second pressure bearing plates 1512, 2 third pressure bearing plates 1522, 2 second tension rivets 1513, 2 Three tension-limiting rivets 1523 and 8 sponge blocks 154. The following are explained separately.

The first load gauge set 151 includes one of the two load gauges 1511 , two second pressure bearing plates 1512 , two second tension rivets 1513 and four sponge blocks 154 . Similar to the load gauge 121, the two load gauges 1511 also respectively include a resistive strain gauge (not shown), each of which is deformed by force in a second main detection direction, and causes a corresponding strain gauge through deformation. Resistance changes, the aforementioned second main detection direction is parallel to a second symmetry axis (shown by a dotted line) of the second pressure receiving plate 1512 . The two second pressure bearing plates 1512 have the same symmetrical shape, which is a square in this embodiment, with rounded corners. The symmetrical shape has the aforementioned second axis of symmetry, and one of the two load gauges 1511 is installed between two second pressure bearing plates 1512 and is located on the second axis of symmetry. Therefore, the stress of the two first pressure bearing plates 1512 can be transmitted to the installed load gauge 1511 . The two second tension-limiting rivets 1513 are respectively movably fixed on the same side of the two second pressure-bearing plates 1512 on the second axis of symmetry, so that the deformation of the two second pressure-bearing plates 1512 on one side is limited to the corresponding within the allowable range of the second tension rivet 1513. As shown in Figure 6, when the first load gauge group 151 is in the state of eccentric force, that is, the resultant point of force is not at the load On the meter 1511, the second pressure bearing plate 1512 will be deformed. Similarly, the second tension rivet 1513 is designed to prevent the second pressure bearing plate 1512 from contacting the non-load gauge 1511 due to excessive deformation and distorting the reading of the load gauge 1511 . The function of the sponge block 154 is the same as that of the sponge block 125, which is bonded to the corners of each pressure bearing plate, and will not be repeated.

The second load gauge group 152 includes another one of the two load gauges 1511, two third pressure bearing plates 1522, two third tension rivets 1523 and four sponge blocks 154. The two third pressure bearing plates 1522 have The same symmetrical shape, which is a square in this embodiment, with rounded corners, is the same as the shape of the second pressure receiving plate 1512 . The symmetrical shape has a third axis of symmetry (shown in dashed lines). The other of the two load gauges 1511 is installed between the two third pressure bearing plates 1522 and is located on the third axis of symmetry. Therefore, the force of the two third pressure bearing plates 1522 can be transmitted to the load gauge 1511 therebetween. The two third tension-limiting rivets 1523 are respectively movably fixed on the same side of the two third pressure-bearing plates 1522 on the third axis of symmetry, so that the deformation of the two third pressure-bearing plates 1522 on one side is limited to the corresponding Within the allowable range of the third tension rivets. The side sectional view of the second load gauge set 152 is the same as that of the first load gauge set 151 , refer to FIG. 6 .

The electronic detector 153 obtains its resistance change through the change of current between the aforementioned two load gauges 1511, and inversely deduces the corresponding deformation and force of each load gauge 1511 according to the aforementioned resistance change, and compares the two load gauges 1511 The total force is output as a weight value with an electrical signal. Since the first load gauge set 151 is not connected to the second load gauge set 152 , the fourth weight detection combination 15 can measure weight in a larger range. Therefore, the electronic detection gauge 153 may not be installed in the first load gauge set 151 or the second load gauge set 152 , but in any suitable installation position in the first weight detection pad 10 .

It should be noted that, in the fourth weight detection combination 15 , the second main detection direction of the load gauge 1511 installed between the two second pressure bearing plates 1512 is parallel to the second axis of symmetry. The second main detection direction of the load gauge 1511 installed between the two third pressure bearing plates 1522 is parallel to the third axis of symmetry. As far as the installation position is concerned, the two second pressure bearing plates 1512 (the first load gauge group 151) and the two third pressure bearing plates 1522 (the second load gauge group 152) are respectively installed on the sides of the first flexible protective pad body 11. sides.

The signal processing circuit 20, and the fifth weight of the first weight detection combination 12, the second weight detection combination 13, the third weight detection combination 14, the fourth weight detection combination 15, and the second weight detection pad 30 The detection unit 32 is electrically connected to the sixth weight detection unit 33, converts the electrical signal received from the aforementioned components into a corresponding weight value, judges the posture of the human body by the position of the source of the weight value, and separates it from these electrical signals The time point of heartbeat and respiration with stable periodic changes due to heartbeat or respiration. The signal processing circuit 20 itself can be an independent component, which is protected by a special casing and independent from the first weight detection pad 10 and the second weight detection pad 30 . The signal processing circuit 20 can also be installed in the first weight detection pad 10 as shown in FIG. The opening O of the first weight detection pad 10 and the second weight detection pad 30 is electrically connected to the fifth weight detection combination 32 and the sixth weight detection combination 33 ).

The details about judging the posture of the human body will be explained after the structure of the second weight detecting pad 30 is introduced. Regarding the judgment of heartbeat and breathing time points, please refer to FIG. 7 , which shows that the weight value detected by the first weight detection combination 12 separates the heartbeat and breathing time with stable periodic changes due to heartbeat or breathing. point. According to the present invention, the determination of the heartbeat and breathing time points can be performed without limiting the weight value detected by the first weight detection combination 12, and can also use the second weight detection combination 13 or the third weight detection combination 14 The detected weight value is due to the fact that when the human body 2 is breathing or heartbeat, the relaxation of the muscles will redistribute the weight exerted on the mattress 1 by the back, thereby indirectly causing the first weight detection combination 12 and the second weight detection The weight values detected by the combination 13 and the third weight detection combination 14 are fine-tuned. It can be seen from the curve in the lower half of Figure 7 that the detected weight value changes greatly due to breathing, and the peaks and troughs can be clearly seen. The position before and after the peak and the trough will be the time point of exhalation or inhalation, which can be defined as the time point of exhalation or inhalation relative to the place where the peak occurs. The micro-vibration of the curve in a very short time is caused by the heartbeat. By separating it from the graph, the synchronous electrocardiogram signal in the upper half of Fig. 7 can be obtained.

The second weight detection pad 30 is the same as the first weight detection pad 10, and is installed under the mattress 1 during use, but the positions are different. The position of the second weight detection pad 30 corresponds to the position between the thigh and the calf when the human body 2 is in a lying position. place. The second weight detection pad 30 includes a second flexible protective pad body 31 , the aforementioned fifth weight detection assembly 32 and sixth weight detection assembly 33 . These technical elements will be described in detail below.

The second flexible protective pad body 31 is the outermost element of the second weight detection pad 30 and can protect the fifth weight detection assembly 32 and the sixth weight detection assembly 33 therein. According to the present invention, the material of the first flexible protective pad body 11 is TPU, and the upper and lower pieces of TPU are formed after cutting and hot pressing. They have a certain degree of flexibility, can be bent, and can also be waterproof. Due to the flexibility of the second flexible protective pad body 31 , when the second flexible protective pad body 31 is bent, it can be adapted to human bodies 2 with different upper body lengths. Similarly, the edge portion of the second flexible protective pad body 31 can have a plurality of mounting rings 311, which can be connected with the fixing elements of the bed (not shown) to fix the relative position of the second flexible protective pad body 31 and the bed. Misalignment occurs due to user movement. Similarly, a plurality of openings 312 can also be opened inside the second flexible protective pad body 31 .

The fifth weight detection unit 32 is fixed inside the second flexible protective pad body 31 and is electrically connected to the signal processing circuit 20 to detect the weight exerted by the thighs of the human body 2 through the mattress 1, and continuously output the detected weight with electrical signals The value is given to the signal processing circuit 20. The sixth weight detection unit 33 is fixed inside the second flexible protective pad body 31 and is electrically connected to the signal processing circuit 20 to detect the weight exerted by the lower legs of the human body 2 through the mattress 1, and continuously output the detected weight with electrical signals The value is given to the signal processing circuit 20. The structure of the fifth weight detection combination 32 and the sixth weight detection combination 33 is the same as that of the fourth weight detection combination 15, and also has two load gauge groups and connected electronic detection gauges, which will not be repeated here. It should be emphasized that the fifth weight detection combination 32 is not connected to the load gauge group in the sixth weight detection combination 33 , so the two can measure weight in a larger range. In addition, as far as the installation position is concerned, the two load gauge groups are also installed on both sides of the second flexible protective pad body 31 .

According to the present invention, the first pressure receiving plate 123 , the second pressure receiving plate 1512 and the third pressure receiving plate 1522 are made of polyethylene terephthalate (PET) or polypropylene (PP). The length of the shorter side of the above-mentioned pressure bearing plate is preferably not less than 10 cm, so as to prevent most of the weight of the mattress 1 from falling on the bed board and cannot be detected by each weight detection combination, which reduces the accuracy of the system.

The details of judging the posture of the human body will be described in conjunction with the relevant diagrams. Please refer to FIG. 8 , which shows the relative position between the human body 2 on the mattress 1 and the system when it is in the left sleeping position. Because the system's first weight detection combination 12, second weight detection combination 13, third weight detection combination 14, fourth weight detection combination 15, fifth weight detection combination 32 and sixth weight detection combination 33 is installed under the mattress 1 and cannot be seen directly, so it is represented by a dotted line. According to the present invention, at this time, the weight value detected by the first weight detection unit 12 is greater than the weight value detected by the third weight detection unit 14 by more than 20%. Since the center of gravity of the upper body of the human body 2 has shifted, but the buttocks have not changed significantly, it can be confirmed that the human body 2 is indeed in the left sleeping position. Similarly, if the weight value detected by the third weight detection combination 14 is greater than the weight value detected by the first weight detection combination 12 by more than 20%, the human body is in the right sleeping position.

Please see Fig. 9, which shows the third flexible protective pad body 14, the fourth weight detection combination 15, and the fifth weight detection combination 32 under the mattress 1 when the human body 2 on the mattress 1 is in the supine sleeping position. The relative position with the sixth weight detection combination 33. The shape of the bed 3 placed on the mattress 1 can be adjusted, so that the human body 2 can switch between the lying position and the sleeping position on the back (the back tilt is between 0° and 90°, and the thigh and calf are moderately bent). If the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 (the first two and the third weight detection combination 14 are side by side and blocked, can not be drawn) the detected weight If the sum of the values continues to decrease, and the weight value detected by the fourth weight detection combination 15 continues to increase, the human body is in the upward sleeping position. At this time, the back of the human body 2 is still attached to the mattress 1, and a part of the positive weight is transmitted through the mattress 1 to the first weight detection unit 12, the second weight detection unit 13 and the third weight detection unit 14. . However, if the sum of the weight values detected by the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 decreases close to zero, and the fourth weight detection combination 15 detects When the weight increases to a peak value, the human body is in a sitting position. At this time, the back of the human body 2 leaves the mattress 1, and the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 cannot detect the weight, and the weight of the upper body of the human body 2 is almost all through the mattress. 1 is passed on the 4th weight detection combination 15. This is the cause of the aforementioned peak. At this time, the human body 2 is in a sitting position on the mattress 1 Figure 10 shows the relative positions between the third flexible protective pad body 14, the fourth weight detection combination 15, the fifth weight detection combination 32 and the sixth weight detection combination 33 under the mattress 1.

When considering the weight values detected by the fifth weight detection combination 32 and the sixth weight detection combination 33 , the system can also predict whether the human body 2 will leave the bed 3 . If the sum of the weight values detected by the first weight detection combination 12, the second weight detection combination 13 and the third weight detection combination 14 decreases close to zero, the weight detected by the fourth weight detection combination 15 increases After reaching a peak value and falling back, and the weight values detected by the fifth weight detection combination 32 and the sixth weight detection combination 33 are close to zero, the human body is in the state of getting out of bed. At this time, the signal processing circuit 20 can also issue a bed-leaving warning, so that the caregiver can pay attention to the cared person who wants to leave the bed, so as to avoid the danger of falling.

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The scope of protection of the present invention should be defined by the scope of the appended patent application.

10: The first weight detection pad

11: The first flexible protective pad

111: Mounting ring

112: opening

12: The first weight detection combination

13: The second weight detection combination

14: The third weight detection combination

15: The fourth weight detection combination

151: The first load gauge group

152: Second load gauge group

153: Electronic Detector

20: Signal processing circuit

30:Second weight detection pad

31: The second flexible protective pad body

311: Mounting ring

312: opening

32: Fifth weight detection combination

33: The sixth weight detection combination

O: open

Claims (9)

A mattress pressure detection system, comprising: a first weight detection pad, installed under the mattress, corresponding to the position between the back and the buttocks when the human body is in a lying position, including: a first flexible protective pad; a first A weight detection combination, fixed inside the first flexible protective pad, detects the weight exerted by the mattress on the left side of the human back, and continuously outputs the detected weight value with electrical signals; a third weight detection combination, It is fixed inside the first flexible protective pad body, detects the weight exerted by the right side of the back of the human body through the mattress, and continuously outputs the detected weight value with electrical signals; and a fourth weight detection combination, fixed on the first Inside the flexible protective pad body, detect the weight exerted by the human buttocks through the mattress, and continuously output the detected weight value with electrical signals; and a signal processing circuit, combined with the first weight detection, the third weight detection The detection combination and the fourth weight detection combination are electrically connected, the received electrical signals are converted into corresponding weight values, the body posture is judged by the position of the weight value source, and the heartbeat is separated from the electrical signals. Or the heartbeat and breathing time points with stable periodic changes generated by breathing, wherein the first weight detection pad further includes a second weight detection combination, which is fixed inside the first flexible protective pad body and detects the center of the back of the human body part of the weight exerted by the mattress, and continuously output the detected weight value with electrical signals, and the signal processing circuit is further electrically connected with the second weight detection combination; the first weight detection combination, the second weight detection The detection combination and the third weight detection combination further include: two load gauges, each of which is deformed by force in a first main detection direction, and causes a corresponding resistance change through deformation; An electronic detector, through the change of the current between the two load gauges, obtains its resistance change, deduces the corresponding deformation and force of each load gauge according to the above resistance change, and sums the force of the two load gauges The weight value is output as an electrical signal; the two first pressure bearing plates have the same symmetrical shape, and the symmetrical shape has a first axis of symmetry, and the two load gauges are installed between the two first pressure bearing plates, located on the first symmetrical At the corresponding positions on both sides of the shaft, the force of the two first pressure bearing plates can be transmitted to at least one of the two load gauges; and the two first tension rivets are respectively movably fixed on the first symmetrical axis The same side of the two first pressure bearing plates, so that the deformation of the two first pressure bearing plates on one side is limited to the allowable range of the corresponding first tension rivet, wherein the first main detection direction is parallel to the first tension rivet. an axis of symmetry. The pressure detection system under the mattress as described in claim 1 further includes a second weight detection pad installed under the mattress corresponding to the position between the thigh and the calf when the human body is in a lying position, including: a second flexible Protective pad body; a fifth weight detection combination, fixed inside the second flexible protective pad body and electrically connected to the signal processing circuit, detects the weight exerted by human thighs through the mattress, and continuously outputs detection signals and a sixth weight detection combination, which is fixed inside the second flexible protective pad and electrically connected to the signal processing circuit, detects the weight exerted by the human calf through the mattress, and continuously outputs the electric signal The detected weight value, wherein the signal processing circuit further judges the posture of the human body according to the change of the weight value from the fifth weight detection combination and the sixth weight detection combination. The mattress down pressure detection system as described in claim 2, wherein the fourth weight detection combination, the fifth weight detection combination and the sixth weight detection combination further include: two load gauges, each load The meter is subjected to force in a second main detection direction to generate deformation, and the corresponding resistance change is caused by deformation; an electronic detection meter obtains its resistance change through the change of current between the two load gauges, according to the aforementioned The resistance change deduces the corresponding deformation and force of each load gauge, and the sum of the force of the two load gauges is output as a weight value as an electrical signal; the second pressure bearing plate has the same symmetrical shape, and the symmetrical shape There is a second axis of symmetry, one of the two load gauges is installed between the two second pressure bearing plates, located on the second axis of symmetry, the force of the two first pressure bearing plates can be transmitted to one of the two load gauges; The two third pressure bearing plates have the same symmetrical shape, and the symmetrical shape has a third axis of symmetry. The other of the two load gauges is installed between the two third pressure bearing plates and is located on the third axis of symmetry. The force of the third pressure bearing plate can be transmitted to the other of the two load gauges; the two second tension rivets are respectively movably fixed on the same side of the two second pressure bearing plates on the second axis of symmetry, so that the The deformation of the second pressure-bearing plate on one side is limited to the allowable range of the corresponding second tension-limiting rivet; and two third tension-limiting rivets are respectively movably fixed on the third axis of symmetry. The second third pressure-bearing The same side of the plate, so that the deformation of the two third pressure bearing plates on one side is limited to the allowable range of the corresponding third tension rivet, wherein, the load gauge installed between the two second pressure bearing plates, its first The two main detection directions are parallel to the second axis of symmetry; the load gauge installed between the two third bearing plates has its second main detection direction parallel to the third symmetry axis. shaft; the two second pressure bearing plates and the two third pressure bearing plates are installed on both sides of the first flexible protective pad or the second flexible protective pad respectively. The mattress pressure detection system according to claim 2, wherein the material of the first flexible protective pad body and the second flexible protective pad body is thermoplastic polyurethane (Thermoplastic Polyurethane, TPU) or polyvinyl chloride (Polyvinyl Chloride, PVC). The mattress pressure detection system as described in claim 1 or claim 3, wherein the material of these pressure bearing plates is polyethylene terephthalate (polyethylene terephthalate, PET) or polypropylene (polypropylene, PP) . The mattress down pressure detection system according to claim 1 or claim 3, wherein the length of the shorter sides of the pressure bearing plates is not less than 10 cm. The mattress pressure detection system as described in claim 1 or claim 3, wherein between the pressure bearing plates, a plurality of sponge blocks are further bonded at the corners. The mattress down pressure detection system according to claim 1, wherein if the weight value detected by the first weight detection combination is greater than 20% of the weight value detected by the third weight detection combination, then The human body is in the sleeping position on the left side; if the weight value detected by the third weight detection combination is greater than 20% of the weight value detected by the first weight detection combination, the human body is in the right sleeping position; If the sum of the weight values detected by the weight detection combination, the second weight detection combination and the third weight detection combination continues to decrease and the weight value detected by the fourth weight detection combination continues to increase, the human body is in sleeping position on the back; if the sum of the weight values detected by the first weight detection combination, the second weight detection combination and the third weight detection combination decreases close to zero and the fourth weight detection combination detects When the measured weight increases to a peak value, the human body is in a sitting position. The mattress down pressure detection system according to claim 2, wherein if the sum of the weight values detected by the first weight detection combination, the second weight detection combination and the third weight detection combination decreases by close to When zero, the weight detected by the fourth weight detection combination increases to a peak and then falls back, and the weight values detected by the fifth weight detection combination and the sixth weight detection combination are close to zero, then the human body out of bed.

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