TW201628583A - A carrier structure for dynamically adjusting pressure distribution - Google Patents

Abstract

The invention is provided a carrier structure for dynamically adjusting pressure distribution, which comprises a plurality of sensing units and gasbags, an air-pressure unit and a control circuit. The sensing units set in the carrier sense the pressure made by a body at one of a plurality of pressed points upon the carrier to generate a plurality of sensing signals. The gasbags set in the carrier are arranged correspond to the sensing units and adjusted for changing the pressure supported by the one pressed point. The air-pressure unit adjusts the air pressure of the gasbags for changing the pressure supported by the one pressed point in response to a control signal. The control circuit coupled to the sensing units and the air-pressure unit signals the control signal to the air-pressure unit in response to the sensing signal. Thereby, the invention is provided to prevent the body with the pressure ulcer.

Description

Dynamically adjusting the carrier structure of the pressure distribution 【0001】

The present invention relates to a carrier structure, and more particularly to a carrier structure that dynamically adjusts the pressure distribution.

【0002】

Press, pressure sore is commonly known as acne, pressure sore is because the skin is under pressure (or oppression), friction caused by skin damage and even deep into the subcutaneous tissue, muscles and bones is called pressure sores. Therefore, pressure sores often occur in patients with long-term physical activity (including those with spinal cord injury), prolonged bed rest, unconsciousness, or physical weakness. The above-mentioned patients often have pressure sores in the parts where the bones protrude. For example, the patient's heel, the vertebral bone, the elbow, the scapula and the posterior cerebral palsy are the parts that are prone to pressure sores, while the patient is resting on the seat cushion. The tail vertebrae, the bones, the back of the knees, and the soles of the feet are the sites where pressure ulcers are likely to occur. Therefore, in order to avoid pressure ulcers in patients, patients should be turned over at the appropriate time according to the skin condition of the case. At least every 2 hours, change the posture once and pay attention to the posture of various postures. However, caregivers often take care of multiple patients, so patients can not get immediate and comprehensive care, and there are doubts about pressure ulcers. Therefore, nursing staff urgently need smart and automated mattresses or cushions to overcome the doubts about pressure ulcers.

[0003]

Furthermore, in the rehabilitation science, the measurement of pressure and shear force is an extremely important physiological signal, because the doctor can diagnose the gait dysfunction or neuromuscular system disease by analyzing the state of the human body under pressure or shear. Related diseases, such as hemiplegia, foot hallux valgus and diabetes. However, the total force of the contact and promotion phases of gait is divided into pressure and shear force, and the pressure and shear force measurement have clinical significance in medicine. For example, scholars have found that patients with valgus valgus and diabetic patients are walking. The shear stress on the inside of the sole is significantly larger than that in normal people. Furthermore, if a large shear force occurs in a diabetic patient, it is easy to cause a foot bruise, and the diabetic patient often ignores the wound due to the sensory neurogenic lesion, and the abnormal blood vessel tends to make the wound difficult to heal. Thus, the diabetic patient is very It is easy to cause ulceration of the foot. If the wound is severe, the patient must amputate. Therefore, measuring the pressure and shear state is especially important for rehabilitation assessment and patients with special diseases.

[0004]

In recent years, some scholars have discovered this problem and developed a device for measuring physiological signals, but usually have some problems. For example, a device developed by a scholar can only measure a single point of power and is cumbersome, or the device size is developed. Large can not be placed in items with small space such as insole. In view of the above problems, the present application applies a micro-electromechanical system technology to design a device suitable for measuring the pressure and shear state of the human body, and the device can be placed in a small space such as a foot pad, or can be set In the large-sized mats such as cushions and mattresses, the human body is subjected to pressure and shearing force to prevent the body from producing pressure sores.

[0005]

The main object of the present invention is to provide a carrier structure for dynamically adjusting a pressure distribution for sensing the pressure or shear force of a human body at at least one stress point of the carrier, and adjusting the pressure of the human body at the force point of the carrier or Shear force to avoid pressure sores.

[0006]

In order to achieve the above-mentioned purpose and effect, the present invention discloses a carrier structure for dynamically adjusting a pressure distribution, which comprises a plurality of sensing units, a plurality of air cells, a pneumatic driving portion and a control circuit. The sensing units are disposed in the carrier, and the sensing units are arranged in an array, and are configured to sense a pressure or a shear force of a human body at at least one force point of the carrier to generate a plurality of signal signals; The airbags are arranged in an array, and the airbags are used to adjust the pressure of the human body at the point of stress of the carrier; the air pressure driving part connects the airbags, and adjusts according to a control signal. The air pressure of the airbag is used to adjust the pressure of the force point; and the control circuit is coupled to the sensing unit and the air pressure driving unit, and generates a control signal according to the measurement signals, and transmits the control signal to the air pressure driving unit. Thus, the present invention changes the pressure of the human body at the point of stress of the carrier to prevent the body from producing pressure sores.

10‧‧‧mat
12‧‧‧ head
14‧‧‧ Back
16‧‧‧ waist
18‧‧‧ calf
19‧‧‧Heel heel
21‧‧‧Sensor unit
210‧‧‧Convex layer
212‧‧‧Floating electrode layer
2120‧‧‧Floating electrode
213‧‧‧Floating coil layer
2130‧‧‧Floating coil
214‧‧‧ dielectric layer
215‧‧ ‧ division
216‧‧‧Fixed electrode layer
2160‧‧‧Fixed electrode
217‧‧‧Fixed coil layer
2170‧‧‧ fixed coil
23‧‧‧Airbag
25‧‧‧Pneumatic Drive Department
27‧‧‧Control circuit
270‧‧‧ arithmetic unit
271‧‧‧ comparator
272‧‧‧Time counting unit
273‧‧‧ comparator
275‧‧‧ comparator
277‧‧‧ comparator
29‧‧‧Storage unit
A‧‧‧Floating electrode
B‧‧‧Floating electrode
C‧‧‧Fixed electrode
D‧‧‧Fixed electrode
C _AP ‧‧‧Capacitance
V _AIR ‧‧‧ pneumatic drive signal
V _C ‧‧‧ control signal
V _CMP1 ‧‧‧ comparison signal
V _CMP2 ‧‧‧ comparison signal
V _IN ‧‧‧External control signal
V _M ‧‧‧Measurement signal
V _P ‧‧‧pressure signal
V _PT ‧‧‧Pressure time signal
V _S ‧‧‧ shear signal
V _ST ‧‧‧ shear force signal
V _TH-P ‧‧‧pressure threshold signal
V _TH-PT ‧‧‧pressure threshold time signal
V _TH-S ‧‧‧Shear threshold signal
V _TH-ST ‧‧‧Shear threshold signal
ZZ'‧‧‧ hatching

【0007】

First: a schematic diagram of an embodiment of an array of sensing units and airbags;
Second figure: a block diagram of an embodiment of a carrier structure for dynamically adjusting the pressure distribution;
Third: it is a perspective view of one embodiment of the sensing unit;
Figure 4A is a structural diagram of an embodiment of a sensing unit;
Figure 4B is a structural diagram of another embodiment of the sensing unit;
Figure 5A is a cross-sectional view of ZZ' of an embodiment of the sensing unit;
Figure 5B: it is a ZZ' sectional view of one embodiment of the sensing unit sensing pressure;
Figure 5C is a cross-sectional view of ZZ' of an embodiment of sensing unit sensing shear force;
Figure 6 is a block diagram of an embodiment of a control circuit;
Figure 7: is a schematic view of one embodiment of the pressure of the human body lying on each force point of the carrier;
Figure 8 is a schematic diagram of an embodiment in which the control circuit does not adjust the pressure of the human body at the force point of the carrier; and the ninth diagram: it is one of the pressures at which the control circuit has adjusted the force point of the human body at the carrier A schematic of an embodiment.

[0008]

In order to provide a better understanding and understanding of the features and the efficacies of the present invention, the preferred embodiment and the detailed description are as follows:

【0009】

Referring to the first and second figures, the first diagram is a schematic diagram of an embodiment of an array of sensing units and airbags, and the second diagram is a block diagram of one embodiment of a carrier structure for dynamically adjusting the pressure distribution. As shown in the figure, the present invention discloses a carrier structure for dynamically adjusting a pressure distribution. The carrier of the embodiment of the present invention may be a mat 10 including a plurality of sensing units 21, a plurality of air cells 23, a pneumatic driving unit 25, and a control. Circuit 27. The sensing units 21 are disposed in the mat 10, and the sensing units 21 are arranged in an array, and are configured to sense a plurality of coil current changes and sense a pressure or shear of a human body at at least one force point of the mat 10. The plurality of test signals V _M are generated by force, and the airbags 23 are disposed in the mat 10 and arranged in an array on the sensing units 21 for adjusting the force points of the human body on the mat 10 . The pressure driving unit 25 is connected to the airbags 23, and adjusts the air pressure of the airbags 23 according to a control signal V _C to adjust the pressure of the force receiving point; and the control circuit 27 is coupled to the sensing units 21 And the air pressure driving unit 25 generates the control signal V _C according to the measurement signals V _M and transmits the control signal V _C to the air pressure driving unit 25. Thus, the present invention changes the pressure of the human body at the point of force of the mat 10 to prevent the body from producing pressure sores.

[0010]

Referring to the second figure, the carrier structure of the dynamic pressure distribution of the present invention further comprises a storage unit 29 for storing a pressure threshold signal V _TH-P , a shear threshold signal V _TH-S , a pressure threshold time Signal V _TH-PT and a shear threshold signal V _TH-ST . In this manner, the control circuit 27 is coupled to the sensing unit 21, the air pressure driving unit 25 and the storage unit 29, according to the measurement signal V _M , the pressure threshold signal V _TH-P , the shear threshold signal V _TH-S , The pressure threshold time signal V _TH-PT and the shear threshold signal V _TH-ST generate different control signals V _C to the air pressure driving unit 25 , and the air pressure driving unit 25 generates different air pressure driving according to different control signals V _{C .} The signal V _{AIR is applied} to the airbags 23 to adjust the air pressure of the airbags 23 to cause the human body to change the pressure at the point of force of the mat 10 to avoid pressure ulcers in the human body. Further, the air pressure driving unit 25 and the storage unit 29 of the present invention are provided in the mat 10 like the control circuit 27. In addition, the storage unit 29 can be disposed in the control circuit 27 in addition to the control circuit 27 to record the pressure threshold signal V _TH-P , the shear threshold signal V _TH-S , the pressure threshold time signal V _TH-PT and the shear force. Threshold signal V _TH-ST .

[0011]

Please refer to the third figure and the fourth A figure. The third figure is a perspective view of one embodiment of the sensing unit and the fourth A figure is a structural diagram of an embodiment of the sensing unit. As shown, the sensing unit 21 of the present invention includes a convex layer 210, a floating electrode layer 212, a dielectric layer 214, and a fixed electrode layer 216. The convex layer 210 is used to contact the human body at the force receiving point of the mat 10; the floating electrode layer 212 includes a plurality of floating electrodes 2120 arranged in an array and disposed on one side of the convex layer 210; the dielectric layer 214 is disposed on one side of the floating electrode layer 212; and the fixed electrode layer 216 includes a plurality of fixed electrodes 2160, the fixed electrode 2160 is opposite to the floating electrode 2120, and the fixed electrode layer 216 is disposed on one side of the dielectric layer 214; The sensing unit 21 generates the amount of current change according to the distance between the floating electrode 2120 and the fixed electrodes 2160 to generate the measurement signals V _M .

[0012]

Furthermore, the sensing unit 21 of the present invention is a capacitive sensing unit, wherein the floating electrode 2120 is a capacitor corresponding to the fixed electrode 2160, so the distance between the floating electrode 2120 and the fixed electrode 2160 causes a current variation. And determine a capacitance value CAP. In other words, the measurement signal V _M generated by the sensing unit 21 represents the capacitance value CAP between the floating electrode 2120 and the fixed electrode 2160. Therefore, the present invention can sense the pressure of the human body at the point of stress of the mat 10 by the capacitance value CAP between the floating electrode 2120 and the fixed electrode 2160 to avoid pressure ulcers generated by the human body.

[0013]

Referring to FIG. 4A, the convex layer 210 of the present invention is used to effectively concentrate the force on the sensing unit 21, and the material of the convex layer 210 is polydimethylsiloxane (PDMS). The floating electrode layer 212 and the fixed electrode layer 216 are made of polyimide (PI) and copper foil. The functions of the two layers are to form a capacitor, that is, the sensing unit 21 of the present invention is a capacitive sensing unit. . Furthermore, the floating electrode layer 212 and the fixed electrode layer 216 made of polyimide and copper foil of the present invention have the advantages of high resilience, difficulty in cracking, and easy fabrication to increase yield. In addition, the polyimide and the copper foil are used as the material of the flexible circuit board, that is, the floating electrode layer 212 and the fixed electrode layer 216 are flexible circuit boards, so the control circuit 24 and the sensing unit 21 of the present invention can be integrated into the same flexible circuit. The plate reduces the cost of the carrier structure that dynamically adjusts the pressure distribution.

[0014]

In the above, the material of the dielectric layer 214 is like a material of the convex layer 210, which is polydimethyl methoxy oxide. Thus, the dielectric between the floating electrode layer 212 and the fixed electrode layer 216 is polydimethyl methoxy oxane. The dielectric layer 214 of the elastomeric material can be inherently resilient. Moreover, the dielectric constant of the polydimethyl siloxane dielectric layer 214 is 2.7 times that of air, so for the structure of the capacitor, the dielectric layer 214 made of polydimethyl siloxane is compared to the air. The dielectric layer has the advantage of a large initial capacitance value. In addition, the capacitor made of the polydimethyl siloxane oxide layer 214 has a simple structure and is easy to fabricate, and the present invention can adjust the convex layer 212 and the dielectric layer. The mixing ratio of the polydimethyloxane of 214 changes the measurement sensitivity and the loading amount of the sensing units 21. Therefore, the capacitive sensing unit of the present invention has the advantages of recovery, simple structure, easy fabrication, large initial capacitance value and cost compared to the conventional capacitive sensing unit.

[0015]

Please refer to FIG. 5A, which is a cross-sectional view of ZZ' of one embodiment of the sensing unit. As shown, the floating electrode layer 212 of the sensing unit 21 of the present invention includes two floating electrodes 2120 and the fixed electrode layer 216 includes two fixed electrodes 2160. The floating electrode A and the fixed electrode C form a capacitor, and the floating electrode B and the fixed electrode D form a capacitor. However, the present invention does not limit the number of the floating electrode 2120 and the fixed electrode 2160, and the number depends on the designer's needs, such as The fourth figure of the invention includes four floating electrodes 2120 and four fixed electrodes 2160, that is, four sets of capacitors. Please refer to FIG. 5B, which is a ZZ' cross-sectional view of one embodiment of the sensing unit sensing pressure. As shown, a top-down pressure is applied to the convex layer 210 of the sensing unit 21. This pressure may also be referred to as a positive force. Thus, the convex layer 210 is subjected to pressure to approach the fixed electrode layer 216. . In other words, the distance between the floating electrode layer 212 and the fixed electrode layer 216 is reduced by the action of the pressure, so the capacitance value CAP between the floating electrode A and the fixed electrode C and the capacitance value CAP between the floating electrode B and the fixed electrode D At the same time, the amount of current change is generated, and the capacitance value CAP between the floating electrode A and the fixed electrode C after the pressure action is completed is equivalent to the capacitance value CAP between the floating electrode B and the fixed electrode D.

[0016]

Continuation of the above, the same as the capacitance value of the pressure after the completion of the CAP, so that the floating electrode and the fixed electrode C A generated by measuring the amount of signal V _M equal to the detection signals of the floating electrode and the fixed electrode D B V _M generated. Therefore, the control circuit 27 of the present invention controls the air pressure driving portion 25 by the same measurement signal V _M to prevent the human body from being subjected to the same pressure for a long time in the mat 10 and suffering from the same pressure for a long time to generate pressure sores. In addition, the embodiment of the present invention describes the technical content of the present invention in an ideal state in which the capacitors are not different in the manufacturing process. However, if the capacitor is processed in a practical manner, the initial capacitance value CAP of the capacitor is different. In this way, the same pressure acts on different capacitors to generate different measurement signals V _M , and the designer should be able to design the control circuit 27 of the present invention to prevent the human body from generating pressure ulcers according to different measurement signals V _M , so the present invention It will not be detailed here.

[0017]

Please refer to the fifth C diagram, which is a ZZ' sectional view of one embodiment of the sensing unit sensing shear force. As shown, a left-to-right shear force is applied to the convex layer 210 of the sensing unit 21. This shear force can also be referred to as a normal force. Thus, the convex layer 210 is nearly fixed by the shear force. The electrode layer 216, in other words, the distance between the floating electrode layer 212 and the fixed electrode layer 216 is reduced by the action of the shear force. However, in comparison with the fifth B diagram and the fifth C diagram, the shearing action direction is different from the pressure acting direction, so when the shearing force acts on the convex circular layer 210, the convex circular layer 210 is made of the edge of the sensing unit 21 as a fulcrum. The shear force is converted into a torsional force acting on the dielectric layer 214 to form a force similar to that of the cantilever beam, thereby causing a difference in the amount of deformation on both sides, that is, the amount of current change on both sides is different.

[0018]

Thus, the amount of deformation of the sensing unit 21 of the fifth C diagram is different from the amount of deformation of the sensing unit 21 of the fifth panel B. In other words, the floating electrode A of the fifth C diagram is slightly closer to the fixed electrode C, and the floating electrode B is substantially close to the fixed electrode D. Therefore, the capacitance value CAP between the floating electrode A and the fixed electrode C is less than the floating electrode B and fixed. The amount of capacitance CAP change between the electrodes D. Therefore, after the shearing force is completed, the capacitance value CAP between the floating electrode A and the fixed electrode C is smaller than the capacitance value CAP between the floating electrode B and the fixed electrode D, and thus, the measurement signals generated by the floating electrode A and the fixed electrode C are generated. V _{M is} different from the measurement signal V _M generated by the floating electrode B and the fixed electrode D. Therefore, the control circuit 27 of the present invention controls the air pressure driving portion 25 according to different measurement signals V _M to prevent the human body from generating pressure sores or skin damage due to shearing action. In addition, the sensing unit 21 of the present invention can sense external forces acting on different directions of the convex layer 210, so the present invention does not limit the pressure that the sensing unit 21 can only sense as a positive force and the shear that is a normal force. force.

[0019]

In addition, please refer to FIG. 4B, which is a structural diagram of another embodiment of the sensing unit. As shown, the sensing unit 21 of the present invention may be in another form, such as an electromagnetic compression shear sensing unit. The difference between the electromagnetic pressing force sensing unit and the capacitive sensing unit is that the floating electrode layer 212 is changed to the floating coil layer 213, the dielectric layer 214 is changed to the inter-layer 215, and the fixed electrode layer 216 is changed to the fixed coil layer 217. . The floating coil layer 213 and the fixed coil layer 217 are used to provide the micro coils 2130 and 2170. Therefore, the floating coil layer 212 and the fixed coil layer 216 are respectively embedded in the four micro floating coils 2130 and the fixed coil 2170 instead of the floating electrode 2120 and the fixed electrode. 2160. After inputting the current to the floating coil layer 213, an electromagnetic field is generated, and the fixed coil layer 217 is coupled through the electromagnetic field. The fixed coil layer 217 generates a corresponding coil current, and the change of the coil current can sense the pressure and the shear force. The inter-layer 215 and the dielectric layer 214 are also used to make the sensing unit 21 resilient.

[0020]

Furthermore, the electromagnetic pressing force sensing unit senses that when the pressure acts on the convex layer 210, the inter-layer 215 is compressed to reduce the distance between the floating coil layer 213 and the fixed coil layer 217, and the fixed coil The coil current generated by the coupling of the four micro-coils 2170 of the layer 217 is increased. When the coil currents of the four micro-coils in the sensing unit 21 are the same, the external force can be judged to be a pressure. When the shear force acts on the convex layer 210, a force similar to that of the cantilever beam is formed (as shown in FIG. 5C), which causes the deformation amount on both sides of the sensing unit 21 to be different, thereby causing the fixed coil layer 217 to be The coil current generated by the coupling is different, and at this time, it can be judged as a shear force. The material of the convex layer 210 and the inter-layer 215 in the electromagnetic pressure-shearing sensing unit may be the same as the material of the convex layer 210 and the dielectric layer 214 in the capacitive sensing unit, and the same is not repeated here. Description.

[0021]

Please refer to the sixth diagram, which is a block diagram of one embodiment of a control circuit. As shown, the control circuit 27 of the present invention includes an arithmetic unit 270, a plurality of comparators 271, 273, 275, 277, and a timing counter unit 272. The operation unit 270 of the control circuit 27 is coupled to the sensing units 21 to receive the measurement signals V _M and calculate the measurement signals V _M to generate a pressure signal V _P or a shear signal V _S . The comparator 271 is coupled to the computing unit 270 and the storage unit 29 for receiving the pressure signal V _P and the pressure threshold signal V _TH-P and comparing whether the pressure signal V _P is greater than the pressure threshold signal V _TH-P to generate a comparison signal V _CMP1 . The comparator 273 is coupled to the arithmetic unit 270 and the storage unit 29 to receive the shear signal V _S and the shear threshold signal V _TH-S , and compare whether the shear signal V _S is greater than the shear threshold signal V _TH-S to generate a comparison. Signal V _CMP2 . The timer counting unit 272 is coupled to the comparator 271 and the comparator 273 to receive the comparison signal V _CMP1 or the comparison signal V _CMP2 . When the operation unit 270 generates the pressure signal V _P , the timing counting unit 272 counts the time for continuously generating the comparison signal V _CMP1 . A pressure time signal V _{PT is} generated. When the operation unit 270 generates the shear signal V _S , the timing counting unit 272 continuously counts the number of times the comparison signal V _CMP2 is generated to generate a shear frequency signal V _ST .

[0022]

In response to the above, the comparator 275 is coupled to the timer counting unit 272 and the storage unit 29 to receive the pressure time signal V _PT and the pressure threshold time signal V _TH-PT , and compare whether the pressure time signal V _PT is greater than the pressure threshold time signal V _{TH- The PT} generates a control signal V _C . The comparator 277 is coupled to the timing counting unit 272 and the storage unit 29 to receive the shear force signal V _ST and the shear threshold signal V _TH-ST , and compare whether the shear force signal V _ST is greater than the shear threshold signal V _{TH . -ST} generates a control signal V _C . When the timing counter unit 272 generates the pressure time signal V _PT , the control signal V _C is output from the comparator 275 to the air pressure driving unit 25, and when the timing counting unit 272 generates the shear force signal V _ST , the control signal V _{C is} controlled by the comparator 277. It is output to the air pressure driving portion 25 to avoid pressure ulcers or skin damage. In addition, the present invention does not limit the pressure of the human body to the pressure point of the mat 10 to be sensed by the control circuit 27, and the control circuit 27 can design a control terminal to receive an external control signal. V _IN , and the medical staff directly adjusts the cushion 10 suitable for the patient, so that the patient does not have to wait for a while before lying comfortably on the mat 10.

[0023]

In addition, when the sensing unit 21 is an electromagnetic pressure-shearing force sensing unit, it can also be controlled by the above-mentioned control circuit 27, and the coil current generated by the electromagnetic pressure-shear force sensing unit is the above-mentioned measuring signal V. _M , the rest of the operation is as above, and will not be repeated.

[0024]

Please refer to the seventh figure, which is a schematic diagram of one embodiment of the pressure of the human body lying on each force point of the carrier. As shown in the figure, the seventh figure shows the pressure state of each force point when the patient lies on the mat 10, and the pressure on the back 14 and the hip 16 of the patient is the greatest. Hereinafter, how to adjust the pressure of the force point of the back 14 and the buttocks 16 of the patient will be explained.

[0025]

Referring to the seventh figure and referring to the eighth figure, the eighth figure is a schematic diagram of an embodiment in which the control circuit does not adjust the pressure of the human body at the stress point of the carrier. As shown, the patient lies on the mat 10 and the head 12, the back 14, the hips 16, the lower leg 18 and the rear heel 19 are respectively located at different points of force in the mat 10, and further, the head 12, the back 14, the buttocks 16. The lower leg 18 and the rear heel 19 are subjected to different pressures, respectively, while the pressure points of the back 14 and the buttocks 16 are subjected to the greatest pressure. Therefore, the pressure on the patient's back 14 and hips 16 must be adjusted to avoid pressure sores on the patient's back 14 and hips 16.

[0026]

Referring to the second to seventh figures, the plurality of convex layers 210 of the sensing unit 21 in the carrier structure for dynamically adjusting the pressure distribution contact the stress points of the back 14 and the buttocks 16 of the patient and withstand the pressure of the back 14 and the buttocks 16, Thus, the distance between the floating electrode A and the fixed electrode C and the distance between the floating electrode B and the fixed electrode D are shortened, and the amount of current change is generated and the capacitance value CAP becomes large, so the control circuit 27 receives the same amount. Test signal V _M . Furthermore, the arithmetic unit 270 of the control circuit 27 calculates the measurement signal V _M and generates a pressure signal V _P to the comparator 271. The comparator 271 compares the pressure signal V _P and the pressure threshold signal V _TH-P . If the pressure signal V _{P is} greater than the pressure threshold signal V _TH-P , the high level comparison signal V _CMP1 is output, and vice versa, the low level comparison signal is output. V _CMP1 . In addition, when the pressure signal V _{P is} greater than the comparison signal V _CMP1 of the high threshold of the voltage threshold signal V _TH-P comparator 271 or the low level comparison signal V _CMP1 can be determined by the designer, the present invention does not limit the comparison. The way the device is designed.

[0027]

In response to the above, the timer counting unit 272 starts counting the time of continuously generating the high level comparison signal V _CMP1 to generate the pressure time signal V _PT . Thus, the comparator 275 compares the pressure time signal V _PT and the pressure threshold time signal V _{TH-PT .} If the pressure time signal V _{PT is} greater than the pressure threshold time signal V _TH-PT , the comparator 275 outputs the high level control signal V _C , and vice versa, outputs the low level control signal V _C . Therefore, the control circuit 27 outputs the high-level control signal V _C to the air pressure driving unit 25, and the air pressure driving unit 25 generates a corresponding air pressure driving signal V _AIR to the air bags 23 according to the high-level control signal V _C to adjust The back 14 of the patient and the buttocks 16 are located at the air pressure of the airbag 23 at the point of force, so that the pressure applied to the force points of the original back 14 and the buttocks 16 is reduced and the pressure applied to the other points of force is increased, but other forces are applied. The pressure increase of the point does not exceed the limit that the human body can withstand. Thus, the carrier structure that dynamically adjusts the pressure distribution can prevent pressure ulcers on the back 14 and the buttocks 16 of the patient. Please refer to the ninth figure, which is a schematic diagram of an embodiment in which the control circuit has adjusted the pressure of the human body at the stress point of the carrier. As shown, the present invention has adjusted the patient's back 14 and hip 16 to be placed on the cushion 10. The pressure of the force point adjusts the pressure of the force points of the original back 14 and the buttocks 16 to be more evenly distributed on the force points such as the head 12, the back 14 and the buttocks 16.

[0028]

Similarly, when the patient's back 14 and hip 16 are in the epidermal recovery period, and the patient has several turning movements during sleep, the sensing unit 21 senses different measurement signals V _M , and the operation unit 270 of the control circuit 27 operates. The measurement signal V _M outputs a shear signal VS to the comparator 273, and the comparator 273 compares the shear signal V _S and the shear threshold signal V _TH-S , if the shear signal V _{S is} greater than the shear threshold signal V _{TH The -S} comparator 273 outputs the high-level comparison signal V _CMP2 to the timing counting unit 272. The timing counting unit 272 counts the number of times the high-level comparison signal V _{CMP2 is} generated and outputs the shear force signal V _ST to the comparator 277 for comparison. The device 277 compares the shear force signal V _ST and the shear threshold signal V _TH-ST , and if the shear frequency signal V _{ST is} greater than the shear threshold signal V _TH-ST comparator 277 outputs the high level control signal V _C to The air pressure driving unit 25 generates a corresponding air pressure driving signal V _AIR to the air bags 23 according to the high level control signal V _C . Thus, the carrier structure of the dynamic pressure distribution adjustment adjusts the air pressure of the air bags 23 . Prevent the patient's back 14 Buttocks 16 produces pressure sores or skin damage.

[0029]

Based on the above, when the array sensing unit 21 in the carrier measures the pressure or shear distribution of the human body, the control circuit 27 records the pressure and the shear force of each measuring point, for example, the back 14 and the hip 16 At the point of stress, if the pressure or shear force is greater than a specific clinical recommendation (pressure threshold signal V _TH-P or shear threshold signal V _TH-S ), control circuit 27 calculates the duration or occurrence of the measurement point. The number of times, if the duration or the number of occurrences is greater than a certain clinically recommended amount (pressure threshold time signal V _TH-PT or shear threshold number signal V _TH-ST ), the control circuit 27 activates the air pressure driving unit 25 to change the carrier. The air pressure of each airbag 23 is such that it changes the external force distribution of the human body to prevent the body from producing acne.

[0030]

Further, the present invention assumes irreversible tissue changes in the tissue of the human body at an external force exceeding 70 mmHg for more than two hours, which is also the most important factor causing pressure sores. Therefore, the carrier structure of the dynamic pressure distribution of the present invention is designed according to the pressure threshold signal V _TH-P (70 mmHg), the pressure threshold time signal V _TH-PT (two hours) and the shear threshold signal V _TH-ST . To avoid pressure ulcers or epidermal damage in the human body. However, the restrictions required for different patients or different diseases are not necessarily the same. Therefore, the designer can modify the pressure threshold signal V _TH-P , the pressure threshold time signal V _TH-PT and the shear threshold according to the structure of the present invention. The frequency signal V _{TH-ST is} used to prevent the production of pressure sores for different patients.

[0031]

In addition, when the sensing unit 21 is an electromagnetic pressure-shearing force sensing unit, it can also be controlled by the control mode of the above-mentioned control circuit 27, and will not be repeated here.

[0032]

In summary, the present invention discloses a carrier structure for dynamically adjusting a pressure distribution, which includes a plurality of sensing units, a plurality of air cells, a pneumatic driving portion, and a control circuit. The sensing units are disposed in the carrier, and the sensing units are arranged in an array, and are configured to sense a pressure or a shear force of a human body at at least one force point of the carrier to generate a plurality of signal signals; The airbags are arranged in an array, and the airbags are used to adjust the pressure of the human body at the point of stress of the carrier; the air pressure driving part connects the airbags, and adjusts according to a control signal. The air pressure of the airbag is used to adjust the pressure of the force point; and the control circuit is coupled to the sensing unit and the air pressure driving unit, and generates a control signal according to the measurement signals, and transmits the control signal to the air pressure driving unit. Thus, the present invention changes the pressure of the human body at the point of stress of the carrier to prevent the body from producing pressure sores or damage to the epidermis.

[0033]

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the variations, modifications, and modifications of the shapes, structures, features, and spirits described in the claims of the present invention. All should be included in the scope of the patent application of the present invention.

[0034]

The invention is a novelty, progressive and available for industrial use, and should meet the requirements of the patent application stipulated in the Patent Law of China, and the invention patent application is filed according to law, and the prayer bureau will grant the patent as soon as possible. prayer.

10‧‧‧mat

21‧‧‧Sensor unit

23‧‧‧Airbag

25‧‧‧Pneumatic Drive Department

27‧‧‧Control circuit

29‧‧‧Storage unit

V _AIR ‧‧‧ pneumatic drive signal

V _C ‧‧‧ control signal

V _IN ‧‧‧External control signal

V _M ‧‧‧Measurement signal

V _TH-P ‧‧‧pressure threshold signal

V _TH-PT ‧‧‧pressure threshold time signal

V _TH-S ‧‧‧Shear threshold signal

V _TH-ST ‧‧‧Shear threshold signal

Claims (9)

[Item 1] A carrier structure for dynamically adjusting a pressure distribution, comprising:
The plurality of sensing units are disposed in the carrier, and the sensing units are arranged in an array, and are configured to sense a plurality of coil current changes and sense a pressure or shear force of the human body at at least one force point of the carrier, To generate a complex number of test signals;
a plurality of airbags disposed in the carrier and arranged in an array with the sensing units, wherein the airbags are used to adjust the pressure of the human body at the point of stress of the carrier;
a pneumatic driving unit, the airbags are connected, and the air pressures of the airbags are adjusted according to a control signal to adjust the pressure of the force receiving point; and a control circuit is coupled to the sensing units and the air pressure driving part, And generating the control signal according to the measurement signals, and transmitting the control signal to the air pressure driving unit. [Item 2] The carrier structure for dynamically adjusting the pressure distribution according to claim 1, wherein the sensing units respectively comprise:
a convex circular layer for contacting the human body at the point of stress of the carrier;
a floating coil layer comprising a plurality of floating coils arranged in an array and disposed on one side of the convex layer;
An inter-layer layer disposed on one side of the floating coil layer; and a fixed coil layer including a plurality of fixed coils corresponding to the floating coils, the fixed coil layer being disposed on one side of the inter-layer layer;
The sensing unit generates the measurement signals according to the distance between the floating coils and the fixed coils to generate the measurement signals. [Item 3] The carrier structure of the dynamic pressure distribution according to claim 2, wherein the material of the convex layer and the inter-layer is polydimethyl siloxane, the convex layer and the inter-layer layer adjust polydimethylene Based on the mixing ratio of the oxane, the measurement sensitivity and the load amount of the sensing units are changed. [Item 4] The carrier structure of the dynamic pressure distribution according to claim 2, wherein the floating coil layer and the fixed coil layer are flexible circuit boards. [Item 5] The carrier structure for dynamically adjusting the pressure distribution as described in claim 1 of the patent application further includes:
A storage unit stores a pressure threshold signal, a shear threshold signal, a pressure threshold time signal and a shear threshold signal. [Item 6] The carrier structure for dynamically adjusting the pressure distribution according to claim 5, wherein the control circuit calculates the pressure signal to generate a pressure signal, and compares the pressure signal with the pressure threshold signal to prevent the human body from being generated by pressure. Pressure sores. [Item 7] The carrier structure of the dynamic pressure distribution according to claim 6, wherein when the pressure signal is greater than the pressure threshold signal, the control circuit counts the pressure signal that is greater than the pressure time signal of the pressure threshold signal, and compares The pressure time signal and the pressure threshold time signal, when the pressure time signal is greater than the pressure threshold time signal, generate the control signal to the air pressure portion to adjust the pressure of the force point. [Item 8] The carrier structure for dynamically adjusting the pressure distribution according to claim 5, wherein the control circuit calculates the shear signal by calculating the shear signal, and compares the shear signal with the shear threshold signal to avoid the human body. Pressure ulcers or epidermal damage due to shear forces. [Item 9] The carrier structure for dynamically adjusting the pressure distribution according to claim 8 , wherein when the shearing signal is greater than the shear threshold signal, the control circuit counts the number of shears of the shearing signal greater than the shearing threshold signal The signal is compared with the shear force signal and the shear threshold signal. When the shear frequency signal is greater than the shear threshold signal, the control signal is generated to the air pressure portion to adjust the pressure of the force point.