CN111249541A - Negative pressure wound therapeutic apparatus - Google Patents
Negative pressure wound therapeutic apparatus Download PDFInfo
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- CN111249541A CN111249541A CN201911363970.7A CN201911363970A CN111249541A CN 111249541 A CN111249541 A CN 111249541A CN 201911363970 A CN201911363970 A CN 201911363970A CN 111249541 A CN111249541 A CN 111249541A
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- operational amplifier
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- pressure
- inverting input
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- 230000001225 therapeutic effect Effects 0.000 title claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 34
- 206010052428 Wound Diseases 0.000 claims description 23
- 208000027418 Wounds and injury Diseases 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 6
- 238000009530 blood pressure measurement Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 238000009581 negative-pressure wound therapy Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000002560 therapeutic procedure Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003102 growth factor Substances 0.000 description 1
- 239000003978 infusion fluid Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/71—Suction drainage systems
- A61M1/74—Suction control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3344—Measuring or controlling pressure at the body treatment site
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- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- External Artificial Organs (AREA)
Abstract
The invention discloses a negative pressure wound therapeutic apparatus, which comprises a drainage device, a pressure detection device and a controller, wherein the pressure detection device comprises a pressure sensor for detecting the drainage pressure of the drainage device, and detection signals of the pressure sensor are sequentially sent into an amplifying and filtering circuit and an adjusting and stabilizing circuit for processing, so that power frequency interference and detection noise influence are eliminated, and the stability and the precision of detection of the drainage pressure are effectively improved; and then the processed detection signals are converted into digital quantity and sent into a controller for comparison, and when the detection signal value exceeds a preset safety range value of the system, the controller outputs a control signal for adjusting the working state of the drainage device.
Description
Technical Field
The invention relates to the technical field of wound treatment devices, in particular to a negative pressure wound treatment instrument.
Background
A wound negative pressure therapy apparatus is an apparatus for treating a wound by means of negative pressure and fluid irrigation. Compared to conventional negative pressure therapy, drip therapy has the significant advantage of being able to use drip fluid for irrigation without changing bandages and without interrupting the negative pressure therapy for a long time. The infusate can, where appropriate, remain in the wound for a certain period of time and can be sucked away by means of the underpressure.
In the instillation treatment of wounds, a negative pressure bandage needs to be bound to the wound area and can be in fluid communication with a negative pressure source and an infusion fluid source. In the negative pressure instillation, when the dose of the instillation solution is insufficient, the amount of the effective ingredient such as an antibiotic or a growth factor contained in the instillation solution into the wound is insufficient. The delivery of large doses of instillation can result in overpressure inside the wound bandage, resulting in excessive stretching or expansion of the bandage, which can interfere with the fit of the bandage at the wound site. Therefore, the pressure sensing device is required to be arranged to monitor the drainage pressure of the drainage device in real time, but the detection of the pressure sensor can be interfered by a power frequency signal generated when the current wound negative pressure therapeutic apparatus works, noise interference is easily generated in the signal amplification and transmission process, the detection precision of the drainage pressure is influenced, and the negative pressure instillation control is unstable.
The present invention provides a new solution to this problem.
Disclosure of Invention
In view of the above situation, the present invention is directed to a negative pressure wound therapy apparatus.
The technical scheme for solving the problem is as follows: the utility model provides a wound negative pressure therapeutic instrument, includes drainage device, pressure measurement device and controller, pressure measurement device is including being used for detecting drainage device drainage pressure's pressure sensor, pressure sensor's detected signal sends into in amplifying and filtering circuit and the regulation stabilizing circuit in proper order and handles, then sends into after changing into the digital quantity with the detected signal dress after handling in the controller carries out the comparison, when the detected signal value surpassed the system and predetermine the safety range value, controller output control signal is used for adjusting drainage device's operating condition.
Further, the amplifying and filtering circuit comprises an operational amplifier AR1, an inverting input terminal of the operational amplifier AR1 is connected to one ends of a resistor R2 and a capacitor C4 through a resistor R3, and is connected to one ends of a resistor R4 and a capacitor C2 through a capacitor C3, the other ends of the resistor R2 and the capacitor C2 are grounded through a capacitor C1, and are connected to an output terminal of the pressure sensor through a resistor R1, the other end of the capacitor C4 is grounded, a non-inverting input terminal of the operational amplifier AR1 is connected to one ends of the resistors R5 and R6, the other ends of the resistor R4 and the resistor R5 are connected to an output terminal of the operational amplifier AR1, and the other end of the resistor R6 is.
Furthermore, the output end of the operational amplifier AR1 is further connected to one end of a capacitor C5 and one end of an inductor L1, the other end of the inductor L1 is connected to one end of a capacitor C6, and the other ends of the capacitors C5 and C6 are grounded.
Further, the regulation stabilizing circuit comprises operational amplifiers AR2 and AR3, a non-inverting input terminal of the operational amplifier AR2 is connected to the other end of the inductor L1 through a resistor R7, an output terminal of the operational amplifier AR2 is connected to a non-inverting input terminal of the operational amplifier AR3, an inverting input terminal of the operational amplifier AR3 is connected to one ends of the resistors R8 and R9, the other end of the resistor R8 is grounded, an output terminal of the operational amplifier AR3 is connected to the other end of the resistor R9 and is connected to an inverting input terminal of the operational amplifier AR2 through resistors R10 and R11 in sequence, and an inverting input terminal of the operational amplifier AR2 is also grounded through a resistor R12.
Further, the output end of the operational amplifier AR2 is connected to one end of the capacitor C7 and the non-inverting input end of the operational amplifier AR4 through the resistor R13, the other end of the capacitor C7 is grounded, the inverting input end and the output end of the operational amplifier AR4 are connected to the input end of the a/D converter, and the output end of the a/D converter is connected to the input end of the controller.
Further, the drainage device comprises a first pump body for sucking liquid in the wound area and a second pump body for delivering the drip liquid.
Through the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the pressure sensor is adopted to detect the drainage pressure in real time during instillation treatment, the amplifying filter circuit and the regulating stabilizing circuit are designed to process a pressure detection signal, and the influence of power frequency interference and detection noise is eliminated, so that the stability and the precision of detection of the drainage pressure are effectively improved, the control of negative pressure drainage is accurate, and the treatment effect is obviously improved;
2. the operational amplifier AR3 is adopted to carry out feedback output on an output signal of the operational amplifier AR2, and after resistance voltage division, compensation voltage is input to the inverting input end of the operational amplifier AR2, so that offset voltage of the non-inverting input end of the operational amplifier AR2 is offset, temperature drift is effectively inhibited, and accuracy of detection signal output is guaranteed;
3. the operational amplifier AR4 utilizes the voltage follower principle to carry out isolated output on the detection signal, thereby enabling the A/D conversion of the detection signal to form electrical isolation and ensuring the stability of the signal conversion process.
Drawings
Fig. 1 is a schematic diagram of an amplification filter circuit of the present invention.
Fig. 2 is a schematic diagram of the regulation stabilization circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a wound negative pressure therapeutic instrument, including drainage device, pressure measurement and controller, pressure measurement includes pressure sensor P1 that is used for detecting drainage device drainage pressure, pressure sensor P1's detected signal sends into in amplifying and filtering circuit and the regulation stabilizing circuit in proper order and handles, then send into the controller after changing into the digital quantity with the detected signal after handling and compare, when the detected signal value surpassed system and predetermine the safety range value, controller output control signal is used for adjusting drainage device's operating condition.
In order to prevent the power frequency signal generated when the negative pressure therapeutic apparatus for wounds works from interfering the pressure sensor, firstly, the detection signal of the pressure sensor P1 is sent to the amplifying and filtering circuit for processing. As shown in fig. 1, the amplifying and filtering circuit includes an operational amplifier AR1, an inverting input terminal of the operational amplifier AR1 is connected to one ends of a resistor R2 and a capacitor C4 through a resistor R3, and is connected to one ends of a resistor R4 and a capacitor C2 through a capacitor C3, the other ends of the resistor R2 and the capacitor C2 are grounded through a capacitor C1, and are connected to an output terminal of a pressure sensor P1 through a resistor R1, the other end of the capacitor C4 is grounded, a non-inverting input terminal of the operational amplifier AR1 is connected to one ends of the resistors R5 and R6, the other ends of the resistor R4 and the resistor R5 are connected to an output terminal of the operational amplifier AR1, and the other end of.
After being subjected to RC filtering, a detection signal of the pressure sensor P1 is sent into a double-T-shaped trap circuit formed by a resistor R3-R4 and a capacitor C2-C4, so that a trap formed by the pressure sensor P1 and an operational amplifier AR1 filters the detection signal of the pressure sensor P1, power frequency interference is effectively eliminated, and the detection accuracy of the pressure sensor P1 is improved.
The output end of the operational amplifier AR1 is also connected to one end of the capacitor C5 and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C6, and the other ends of the capacitors C5 and C6 are grounded. The high-frequency interference caused by external clutter can be effectively eliminated by utilizing the pi-type filtering principle, and the system noise is reduced.
The detection signal processed by the amplifying and filtering circuit has unstable factors, so that the adjusting and stabilizing circuit is designed to adjust the detection signal. As shown in fig. 2, the regulation and stabilization circuit includes operational amplifiers AR2 and AR3, a non-inverting input terminal of the operational amplifier AR2 is connected to the other end of the inductor L1 through a resistor R7, an output terminal of the operational amplifier AR2 is connected to a non-inverting input terminal of the operational amplifier AR3, an inverting input terminal of the operational amplifier AR3 is connected to one ends of resistors R8 and R9, the other end of the resistor R8 is grounded, an output terminal of the operational amplifier AR3 is connected to the other end of the resistor R9 and is connected to an inverting input terminal of the operational amplifier AR2 through resistors R10 and R11 in sequence, and an inverting input terminal of the operational amplifier AR2 is also grounded through a resistor.
Because the operational amplifier offset voltage exists in the detection signal input into the operational amplifier AR2, in order to prevent the detection signal offset, the operational amplifier AR3 is adopted to perform feedback output on the output signal of the operational amplifier AR2, and after resistance voltage division, the compensation voltage is input into the inverting input end of the operational amplifier AR2, so that the offset voltage of the non-inverting input end of the operational amplifier AR2 is offset, the temperature drift is effectively inhibited, and the accuracy of the detection signal output is ensured.
The output end of the operational amplifier AR2 is connected to one end of the capacitor C7 and the non-inverting input end of the operational amplifier AR4 through the resistor R13, the other end of the capacitor C7 is grounded, the inverting input end and the output end of the operational amplifier AR4 are connected to the input end of the a/D converter, and the output end of the a/D converter is connected to the input end of the controller. The output signal of the operational amplifier AR2 is sent into the operational amplifier AR4 after RC filtering, and the operational amplifier AR4 outputs the detection signal in an isolated manner by using the voltage follower principle, so that the A/D conversion of the detection signal forms electrical isolation, and the stability of the signal conversion process is ensured.
When the pressure measuring device is used specifically, the pressure sensor P1 is communicated with the negative pressure bandage through the piezometric tube, so that the negative pressure of the wound area is monitored. The drainage device comprises a first pump body for sucking liquid in a wound area and a second pump body for conveying the drip liquid. When the detection signal value exceeds an upper negative pressure threshold value of a preset safety range of the system, the controller cuts off a power supply of the first pump body, and reduces the negative pressure value; and when the pressure is lower than the lower negative pressure threshold value of the preset safety range of the system, the controller cuts off the power supply of the second pump body and interrupts the delivery of the drip liquid.
In conclusion, the invention adopts the pressure sensor to detect the drainage pressure in real time during the instillation treatment, and designs the amplifying filter circuit and the regulating stabilizing circuit to process the pressure detection signal, thereby eliminating the power frequency interference and the detection noise influence, effectively improving the stability and the precision of the detection of the drainage pressure, ensuring the accurate control of the negative pressure drainage and obviously improving the treatment effect.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (6)
1. The utility model provides a wound negative pressure therapeutic instrument, includes drainage device, pressure measurement and controller, its characterized in that: the pressure detection device comprises a pressure sensor for detecting the drainage pressure of the drainage device, detection signals of the pressure sensor are sequentially sent into the amplification filter circuit and the regulation stabilizing circuit for processing, then the processed detection signals are sent into the controller after being converted into digital quantity for comparison, and when the detection signal value exceeds a system preset safety range value, the controller outputs control signals for regulating the working state of the drainage device.
2. The negative pressure wound therapy apparatus of claim 1, wherein: the amplifying and filtering circuit comprises an operational amplifier AR1, wherein the inverting input end of the operational amplifier AR1 is connected with one ends of a resistor R2 and a capacitor C4 through a resistor R3 and is connected with one ends of a resistor R4 and a capacitor C2 through a capacitor C3, the other ends of the resistor R2 and a capacitor C2 are grounded through a capacitor C1 and are connected with the output end of the pressure sensor through a resistor R1, the other end of the capacitor C4 is grounded, the non-inverting input end of the operational amplifier AR1 is connected with one ends of resistors R5 and R6, the other ends of the resistor R4 and the resistor R5 are connected with the output end of the operational amplifier AR1, and the other end of the resistor R6 is.
3. The negative wound pressure treatment apparatus of claim 2, wherein: the output end of the operational amplifier AR1 is further connected to one end of a capacitor C5 and one end of an inductor L1, the other end of the inductor L1 is connected to one end of a capacitor C6, and the other ends of the capacitors C5 and C6 are grounded.
4. The negative wound pressure treatment apparatus of claim 3, wherein: the adjusting and stabilizing circuit comprises operational amplifiers AR2 and AR3, the non-inverting input end of an operational amplifier AR2 is connected with the other end of the inductor L1 through a resistor R7, the output end of the operational amplifier AR2 is connected with the non-inverting input end of an operational amplifier AR3, the inverting input end of the operational amplifier AR3 is connected with one ends of resistors R8 and R9, the other end of a resistor R8 is grounded, the output end of the operational amplifier AR3 is connected with the other end of a resistor R9 and is connected with the inverting input end of the operational amplifier AR2 through resistors R10 and R11 in sequence, and the inverting input end of the operational amplifier AR2 is also grounded through a resistor R12.
5. The negative wound pressure treatment apparatus of claim 4, wherein: the output end of the operational amplifier AR2 is connected to one end of a capacitor C7 and the non-inverting input end of the operational amplifier AR4 through a resistor R13, the other end of the capacitor C7 is grounded, the inverting input end and the output end of the operational amplifier AR4 are connected to the input end of the a/D converter, and the output end of the a/D converter is connected to the input end of the controller.
6. The negative pressure wound therapy apparatus of claim 1, wherein: the drainage device comprises a first pump body for sucking liquid in a wound area and a second pump body for conveying dropping liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363970.7A CN111249541A (en) | 2019-12-26 | 2019-12-26 | Negative pressure wound therapeutic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363970.7A CN111249541A (en) | 2019-12-26 | 2019-12-26 | Negative pressure wound therapeutic apparatus |
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| CN111249541A true CN111249541A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911363970.7A Pending CN111249541A (en) | 2019-12-26 | 2019-12-26 | Negative pressure wound therapeutic apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123517A (en) * | 2022-01-24 | 2022-03-01 | 国网山东省电力公司新泰市供电公司 | Power distribution automation and distribution network automation comprehensive control system and method |
| CN114848929A (en) * | 2022-04-25 | 2022-08-05 | 广州华一生物科技有限公司 | Novel negative pressure wound therapeutic instrument |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379925A (en) * | 2011-04-20 | 2013-10-30 | 凯希特许有限公司 | System for purging negative pressure wound therapy system |
| CN104039286A (en) * | 2012-02-11 | 2014-09-10 | 保罗·哈特曼股份公司 | Wound Therapy Device |
| US20150005699A1 (en) * | 2012-03-23 | 2015-01-01 | Nxstage Medical, Inc. | Peritoneal dialysis systems, devices, and methods |
| CN208212015U (en) * | 2017-06-21 | 2018-12-11 | 青岛锐海柏信息技术有限公司 | A kind of heart rate monitoring unit based on dual mode transducer |
-
2019
- 2019-12-26 CN CN201911363970.7A patent/CN111249541A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379925A (en) * | 2011-04-20 | 2013-10-30 | 凯希特许有限公司 | System for purging negative pressure wound therapy system |
| CN104039286A (en) * | 2012-02-11 | 2014-09-10 | 保罗·哈特曼股份公司 | Wound Therapy Device |
| US20150005699A1 (en) * | 2012-03-23 | 2015-01-01 | Nxstage Medical, Inc. | Peritoneal dialysis systems, devices, and methods |
| CN208212015U (en) * | 2017-06-21 | 2018-12-11 | 青岛锐海柏信息技术有限公司 | A kind of heart rate monitoring unit based on dual mode transducer |
Non-Patent Citations (1)
| Title |
|---|
| 魏铭炎: "机电产品环境技术综述", vol. 1, 机械工业出版社, pages: 81 - 84 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123517A (en) * | 2022-01-24 | 2022-03-01 | 国网山东省电力公司新泰市供电公司 | Power distribution automation and distribution network automation comprehensive control system and method |
| CN114848929A (en) * | 2022-04-25 | 2022-08-05 | 广州华一生物科技有限公司 | Novel negative pressure wound therapeutic instrument |
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