CN102058932B - Negative pressure control device and control method of negative pressure treatment system - Google Patents
Negative pressure control device and control method of negative pressure treatment system Download PDFInfo
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- CN102058932B CN102058932B CN 201010597015 CN201010597015A CN102058932B CN 102058932 B CN102058932 B CN 102058932B CN 201010597015 CN201010597015 CN 201010597015 CN 201010597015 A CN201010597015 A CN 201010597015A CN 102058932 B CN102058932 B CN 102058932B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 11
- 238000002560 therapeutic procedure Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 8
- 230000000052 comparative effect Effects 0.000 claims description 7
- 230000000740 bleeding effect Effects 0.000 claims description 5
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- 230000002123 temporal effect Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 5
- 239000000284 extract Substances 0.000 abstract 1
- 208000027418 Wounds and injury Diseases 0.000 description 86
- 206010052428 Wound Diseases 0.000 description 85
- 238000009581 negative-pressure wound therapy Methods 0.000 description 10
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- 239000007943 implant Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000029663 wound healing Effects 0.000 description 3
- 230000004520 agglutination Effects 0.000 description 2
- 230000010478 bone regeneration Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 230000001133 acceleration Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a negative pressure control device of a negative pressure treatment system. The device comprises an air extraction mechanism which extracts air for a liquid collection bottle and provides negative pressure for the liquid collection bottle, an electric control valve for introducing external gas into the liquid collection bottle, a pressure monitoring module for monitoring actual negative pressure value in the liquid collection bottle, and a negative pressure control module for comparing the actual negative pressure value with a pre-determined negative pressure value and controlling the air extraction quantity of the air extraction mechanism and the air inlet quantity of the electric control valve at the same time according to the comparison result so that the actual negative pressure valve in the liquid collection bottle approaches or reaches the pre-determined negative pressure value. Through the negative pressure control device of the negative pressure treatment system disclosed by the invention, the medical care personnel can regulate the negative pressure according to the actual conditions of patients so as to realize gradual control of the negative pressure and reduce wound discomfort or pain caused by sudden change of pressure during negative pressure treatment. The invention also discloses a control method of the negative pressure treatment system.
Description
Technical field
The present invention relates to the negative pressure wound therapy device technical field, relate in particular to a kind of negative pressure control apparatus and control method of negative pressure wound treating system.
Background technology
Negative pressure wound therapy device, the U.S. is called Negative Pressure Wound Therapv Devices, and referred to as NPWT, its principle promotes the healing of wound for by the wound being applied negative pressure.According to clinical show of the U.S. over nearly 10 years, this equipment has good healing effect to the treatment of wounds of various acute and chronics.
Usually, the negative pressure wound treating system container (be liquid-collecting bottle referred to herein as this container) that comprises negative pressure wound therapy device, wound external member and be used for collecting the wound transudate.Wherein, the wound external member is used for wound closure, makes negative pressure space.Negative pressure wound therapy device is used for createing needed wound negative pressure.Referring to Fig. 1, be a kind of common negative pressure wound treating system shown in the figure.Be negative pressure wound therapy device 8 in the dotted line frame; 1 is human body wound circumference skin histology; Wound implant 2 covers the human body wound; Wound closure 3 is set above wound implant 2, wound is sealed, wound implant 2 is connected on the liquid-collecting bottle 5 by connection tube 4, thereby will be directed to from the transudate of wound in the liquid-collecting bottle 5, collect from the transudate of wound by liquid-collecting bottle 5, the other end of liquid-collecting bottle 5 is connected with the air pump 6 of adjustable air flow amount, provides negative pressure by the air pump 6 of adjustable air flow amount, provides power for wound fluid flow to liquid-collecting bottle 5; The air pump 6 of adjustable air flow amount connects a central control module 7, realizes control by the air pump 6 of 7 pairs of adjustable air flow amounts of central control module.
For the NPWT system, negative pressure working method intermittently is useful in treatment.This has benefited from intermittently negative pressure to the impact of the terminal blood flow rate of wound.According to the result of study of known various documents, when suction function during in wound, the terminal blood flow rate of wound can obviously be accelerated, and the acceleration of blood flow will bring more various wound to recover necessary nutrient substance, such as oxygen etc.It is generally not long that this blood flow adds time of fastoperation, can return to normal level after about 5 minutes, so general intermittently therapeutic modality adopts 5 minutes negative pressure, recovered to act on wound in 2 minutes, to promote the healing rate of wound.The result of clinical trial also confirms, it is effective doing like this.Existing negative pressure wound surface treatment technology often cooperates wound dressing to use together.A critical function of wound dressing is to make negative pressure space, fills wound, and on average disperses wound pressure.Negative pressure wound treating system of the prior art; very mechanization of the control of its negative pressure; referring to Fig. 2; what Fig. 2 showed is under the intermittent therapy pattern; the negative pressure control drawing of prior art; as can be seen from Figure 2; reach higher predetermined negative pressure value from normal pressure in short time at the utmost point in the liquid-collecting bottle; keep this negative pressure value after treatment a period of time; from then on higher predetermined negative pressure value becomes normal pressure within the extremely short time again, keeps normal pressure to carry out the next cycle that repeats after a period of time, in this process again; the process that negative pressure does not change gradually is in the treatment beginning; negative pressure variation during end or the intermittent therapy all is to finish in a short period of time change.According to the patient information demonstration that each clinical application of NPWT feeds back, most patient in use, can produce because of the abrupt change of air pressure pain.This is because the quick increase of wound negative pressure can cause the wound to fill dressing wound is produced extruding; And the quick release of wound negative pressure, the expansion that can cause the wound to fill dressing is expanded, and also wound is produced friction.And, as can be seen from Figure 2, existing negative pressure control, in its each cycle, predetermined negative pressure value is all the same, and the time of each cycle experience too, and in the therapeutic process of patient's wound, at the beginning, the wound condition of the injury is relatively more serious, deterioration, required negative pressure is higher, to the later stage, when wound begins to heal, do not need larger negative pressure, if and continue to provide the change of negative pressure, can the healing of wound be had side effects, affect wound healing.
Summary of the invention
The object of the present invention is to provide a kind of negative pressure control apparatus and method of negative pressure wound treating system, the negative pressure in the liquid-collecting bottle can be gradually changed, so that the variation of negative pressure is controlled, reduce because unexpected pressure change and pain that the patient is produced.
Simultaneously, purpose of the present invention also is by the control to negative pressure, produces the negative pressure treatment mode of arbitrary curve, by controlling best treatment curve, can carry out useful treatment to the patient, and the while is the discomfort of reduction of patient to a certain extent.
The negative pressure control apparatus of negative pressure wound treating system of the present invention comprises:
Extraction sector is by providing negative pressure to bleeding in the liquid-collecting bottle for liquid-collecting bottle;
Electrically-controlled valve is used for extraneous gas is imported in the liquid-collecting bottle;
Pressure monitoring module is used for the actual suction pressure value in the monitoring liquid-collecting bottle;
The negative pressure control module with actual suction pressure value and predetermined negative pressure value relatively, according to comparative result, is controlled the rate of air sucked in required of extraction sector and the air inflow of electrically-controlled valve simultaneously, actual suction pressure value in the liquid-collecting bottle is approached or reaches predetermined negative pressure value.
Preferably, described negative pressure control module comprises:
Operation processing unit compares actual suction pressure value and predetermined negative pressure value, according to comparative result, sends control instruction;
ECU is according to the rate of air sucked in required of described control instruction control extraction sector and the air inflow of electrically-controlled valve.
Preferably, the speed of the motor of described ECU by controlling described extraction sector is controlled the rate of air sucked in required of extraction sector.
Preferably, the size of the steam vent of described ECU by controlling described electrically-controlled valve is controlled air inflow.
Preferably, described ECU is controlled the voltage of described extraction sector and the voltage of electrically-controlled valve, with the rate of air sucked in required of control extraction sector, the air inflow of electrically-controlled valve.
Preferably, described ECU is controlled the electric current of described extraction sector and the electric current of electrically-controlled valve, with the rate of air sucked in required of control extraction sector, the air inflow of electrically-controlled valve.
Preferably, described operation processing unit is provided with the DA module, is used for sending voltage signal to ECU.
Preferably, described operation processing unit is provided with the PWM module, is used for sending voltage signal to ECU.
Preferably, described operation processing unit is provided with the Control of Voltage current module, is used for sending current signal to ECU.
Preferably, described predetermined negative pressure value temporal evolution.
Preferably, in time curved variation of described predetermined negative pressure value.
Preferably, the negative pressure amplitude in the described negative pressure control module control negative pressure treatment process slowly diminishes.
Preferably, under the intermittent therapy pattern, the time that described negative pressure control module is controlled each cycle experience diminishes gradually.
The negative pressure control method of negative pressure wound treating system of the present invention comprises:
1) to bleeding in the liquid-collecting bottle, for liquid-collecting bottle provides negative pressure;
2) simultaneously, extraneous gas is imported in the liquid-collecting bottle;
3) the actual suction pressure value in the monitoring liquid-collecting bottle;
4) with actual suction pressure value and predetermined negative pressure value relatively, according to comparative result, by controlling simultaneously rate of air sucked in required and air inflow, actual suction pressure value in the liquid-collecting bottle is approached or reach predetermined negative pressure value.
The negative pressure control apparatus of negative pressure wound treating system of the present invention, owing to the extraction sector that is provided for liquid-collecting bottle is bled, be used for liquid-collecting bottle is imported the electrically-controlled valve of gas, the negative pressure control module that is used for negative pressure control, the negative pressure control module by controlling simultaneously extraction sector rate of air sucked in required and the air inflow of electrically-controlled valve the negative pressure value in the liquid-collecting bottle can be changed by predetermined negative pressure value, can make like this medical personnel can regulate and control according to patient's practical situation the size of negative pressure, the ramp control of vacuum magnitude can be realized, reduce wound discomfort or pain that the patient causes because of the pressure cataclysm when negative pressure treatment.Medical personnel also can be according to patient's practical situation, controls negative pressure in the liquid-collecting bottle according to the predetermined negative pressure value change curve of prior making, can carry out useful treatment to the patient, simultaneously the discomfort of reduction of patient to a certain extent.
Description of drawings
Fig. 1 is the structural representation of existing negative pressure wound treating system;
Fig. 2 is that the negative pressure of existing negative pressure wound treating system is schemed over time;
Voltage-output schematic diagram when Fig. 3 is the PWM low duty ratio;
Voltage-output schematic diagram when Fig. 4 is the PWM high duty ratio;
Fig. 5 is the structural representation of the negative pressure control apparatus of negative pressure wound treating system of the present invention;
Fig. 6 is the user mode figure of the negative pressure control apparatus of negative pressure wound treating system of the present invention;
When Fig. 7 is the negative pressure control apparatus work of negative pressure wound treating system of the present invention, the negative pressure curve chart in the liquid-collecting bottle;
Fig. 8 is the negative pressure control flow chart of the negative pressure control apparatus of negative pressure wound treating system of the present invention;
Fig. 9 is the attainable different negative pressure curve charts of the negative pressure control apparatus of negative pressure wound treating system of the present invention.
Relevant Reference numeral is as follows among the figure:
The 1-wound, 2-wound dressing, 3-pad pasting, 4-connection tube, 5-liquid-collecting bottle, 6-air pump, 7-controller, 8-negative pressure wound therapy device, 9-electrically-controlled valve, 10-pressure monitoring module.
The specific embodiment
Below in conjunction with accompanying drawing, be elaborated by negative pressure control apparatus and the control method of specific embodiment to negative pressure wound treating system of the present invention.
The negative pressure control apparatus of the negative pressure wound treating system in the present embodiment is provided with the PWM module, recently controls the voltage of extraction sector and electrically-controlled valve by the control duty.
Referring to Fig. 3, Fig. 4, electric capacity charges when being output as high level, and high duty ratio is also inconsistent with voltage corresponding to low duty ratio, therefore can control the Voltage-output that dutycycle realizes 0～5V.
Dutycycle is the ratio of time span and the low level time span of high level.The control of dutycycle realizes by the port that the PWM module is arranged.
As shown in Figure 3, Figure 4, dutycycle is larger, and the voltage of acquisition is larger, when dutycycle is 1, namely export high level always, then Voltage-output is 5V, on the contrary, and when dutycycle is that another is extreme 0 the time, i.e. output low level always, then Voltage-output is 0V, and dutycycle is between 0～1, and Voltage-output is namely between 0～5V.
Referring to Fig. 5, the applied negative pressure wound treating system of the negative pressure control apparatus of the negative pressure wound treating system of the present embodiment comprises:
Liquid-collecting bottle 5 is used for collecting wound fluid;
Negative pressure wound therapy device 8;
The wound external member is used for filling and wound closure 1, comprises wound implant-wound dressing 2, wound closure-pad pasting 3, and wound dressing 2 is communicated with liquid-collecting bottle 5 by connection tube 4;
Referring to Fig. 6, the negative pressure control apparatus of the negative pressure wound treating system of the present embodiment comprises:
Electrically-controlled valve 9 imports extraneous gas in the liquid-collecting bottle, and to regulate the negative pressure in the liquid-collecting bottle, this electrically-controlled valve 9 is in normally open in the negative pressure treatment process;
The negative pressure control module, be arranged in the controller 7, actual suction pressure value and predetermined negative pressure value that pressure monitoring module is monitored in the liquid-collecting bottle that obtains compare, according to comparative result, rate of air sucked in required by controlling simultaneously air pump 6 and the air inflow of electrically-controlled valve, and negative pressure in the liquid-collecting bottle is approached or reach predetermined negative pressure value.
Wherein, the negative pressure control module is provided with two ports with PWM module, connects respectively air pump 6 and electrically-controlled valve 9, by the control dutycycle, control corresponding Voltage-output, and then the size of the steam vent by the control rotating speed of air pump 6 and electrically-controlled valve 9 is controlled the speed of exhaust and air inlet speed.
Wherein, air pump 6 and electrically-controlled valve 9 are that negative pressure wound treating system passes through voltage and accurately controls near realize that negative pressure changes predetermined negative pressure value key components.
The negative pressure control apparatus of the negative pressure wound treating system in the present embodiment is because control by to air pump 6 and electrically-controlled valve 9 time, and can realize that negative pressure value slowly changed by the time, can change according to the predetermined negative pressure value in the negative pressure treatment curve shown in Fig. 7; Under the intermittent therapy pattern, the negative pressure control apparatus of negative pressure wound treating system of the present invention control negative pressure changes by negative pressure curve chart shown in Figure 7, realizes the slow variation of negative pressure.When discontinuous operation, pressure in the liquid-collecting bottle need to be from normal pressure to predetermined negative pressure value, change to normal pressure from predetermined negative pressure value again, as required, need to determine the number of times of repetition, suppose that predetermined negative pressure value is-80mmhg, existing negative pressure wound treating system uses 0V, 5V directly determines the switching of air pump, electrically-controlled valve, pressure in the liquid-collecting bottle is become-80mmhg by normal pressure, then after the certain time, in the shorter time, make the pressure in the liquid-collecting bottle become normal pressure, cause pain to the patient by-80mmhg.Negative pressure wound treating system of the present invention arranges air pump 6 and electrically-controlled valve 9, utilization has the port of PWM module to any output of voltage between air pump 6 and the electrically-controlled valve 9 realizations 0～5V, regulate in the liquid-collecting bottle from normal pressure to being scheduled to negative pressure value, the slower variation from predetermined negative pressure value to normal pressure, can make user slowly adapt to the change of negative pressure, thereby make wound reduce unnecessary pain.In actual applications, medical personnel can also can set different negative pressure treatment curves according to patient's different situations, by control air pump 6 and electrically-controlled valve 9, so that the negative pressure in the different moment liquid-collecting bottles is different, make the interior negative pressure of liquid-collecting bottle according to the negative pressure curvilinear motion of setting.
Wherein, the slope that the negative pressure curve rises among Fig. 7 is relevant with the speed of exhaust of air pump 6, and the speed of exhaust is relevant with the rotating speed of the motor of air pump 6, and rotating speed is faster, arrives predetermined negative pressure value just faster.When carrying out negative pressure treatment when beginning to bleed, for lower predetermined negative pressure value, can control air pump 6 with faster speed of exhaust running, reach fast predetermined value; And for higher predetermined negative pressure value, if the speed of exhaust also very soon user will feel under the obvious sense of discomfort, particularly intermittent therapy pattern, high lower negative pressure often changes in therapeutic process, therefore, in the first half section that the negative pressure curve rises, negative pressure is lower, control air pump and bleed with very fast speed, to during the second half section, more and more near amplitude (i.e. maximum predetermined negative pressure value), the negative pressure slope of a curve of setting is tending towards 0, means that will control air pump bleeds with slower speed.
Similarly, the slope that the negative pressure curve descends is relevant with the air inlet speed of electrically-controlled valve 9, and air inlet speed is relevant with the flow passage aperture size of electrically-controlled valve, and the aperture is larger, and air inlet speed is faster, and negative pressure comparatively fast descends in the liquid-collecting bottle.The size in aperture can realize by the voltage of control electrically-controlled valve.When negative pressure is reduced to the normal pressure process from amplitude, when being in lower predetermined negative pressure value, the variation of negative pressure is very little on patient's impact, and the electrically-controlled valve aperture is turned up, and negative pressure is descended as early as possible.And when being in higher predetermined negative pressure value, if air inlet speed is excessive, the patient can feel obvious sense of discomfort, and particularly under the intermittent therapy pattern, high lower negative pressure often changes in therapeutic process.Therefore, in negative pressure decline process, when decline first half section, it is very little that open in the aperture, increases lentamente, and to the second half section, this moment, negative pressure value was relatively low, just can with the rapid air inlet in large aperture, negative pressure be reduced rapidly.Slope of a curve shows that namely on the pore size, when negative pressure began to descend, the aperture was opened very littlely, then slowly becomes large, and during to the second half section, the aperture can all be opened, and makes the air pressure in the liquid-collecting bottle get back to rapidly normal pressure.
Referring to Fig. 8, in negative pressure control, pressure monitoring module 10 is connected to the liquid-collecting bottle place, actual suction pressure value in the monitoring liquid-collecting bottle, the negative pressure control module compares the predetermined negative pressure value at this actual suction pressure value and negative pressure curve place, judges whether and need to bleed, and is specific as follows:
If in pumping process, when the actual suction pressure value that monitors is lower than the predetermined negative pressure value at negative pressure curve place, then calculate the dutycycle of the air pump PWM that need to reduce, thereby the actual suction pressure value in the liquid-collecting bottle is strengthened, approach or reach predetermined negative pressure value; If in pumping process, when the actual suction pressure value that monitors is higher than the predetermined negative pressure value at negative pressure curve place, then calculate the dutycycle of the air pump PWM that needs increase.
If not in pumping process, namely be air-suction state in the liquid-collecting bottle, when the actual suction pressure value that monitors is lower than the predetermined negative pressure value at negative pressure curve place, calculate the dutycycle of the electrically-controlled valve PWM that needs increase, otherwise calculate the dutycycle that needs to reduce electrically-controlled valve PWM.By this control procedure, so that the actual suction pressure value in the liquid-collecting bottle is according to predefined negative pressure curvilinear motion.
In the concrete therapeutic process that adopts negative pressure control apparatus of the present invention to carry out, can carry out negative pressure treatment to set different negative pressure value according to the type of patient's wound size, the wound order of severity, wound, or set different treatment patterns.For example, in the negative pressure treatment process, when adopting the intermittent therapy pattern, the patient need treat with the peak suction of 125mmhg, when high pressure batch treatment time is 5 minutes, can set the time that each cycle is experienced in negative pressure amplitude and the intermittent therapy in the negative pressure treatment process, slowly to diminish.As to set whole therapeutic process be 24 hours, according to the wound situation, can set 24 hours after negative pressure variation be 75mmhg, treatment time 5 minutes of also can before set become 3 minutes.Negative pressure and treatment time are reduced, because in the Wound healing and bone regeneration process, wound worsens at first, serious, gradually healing after wound takes a turn for the better after treatment a period of time, in agglutination, if still utilize the initial predetermined negative pressure value of Wound healing and bone regeneration and negative pressure treatment time, obviously be not too suitable, so in whole therapeutic process, to adopt different negative pressure value in the different phase for the treatment of, different treatment times is so that in agglutination, negative pressure reduces, the negative pressure treatment time shortens, promote the treatment of wound, in order to avoid because adopt larger negative pressure always, long negative pressure treatment time and side effect occurs.
Referring to Fig. 9, Fig. 9 is the adaptable different negative pressure curve charts of the negative pressure control apparatus of negative pressure wound treating system of the present invention, by the negative pressure control apparatus among the present invention, can be with the negative pressure curve linear relationship of negative pressure and time, so that negative pressure treatment process, can select different negative pressure treatment curves according to different diseases, negative pressure is pressed the negative pressure treatment curvilinear motion, reaches best therapeutic effect.
The control method of negative pressure wound treating system of the present invention comprises:
1) to bleeding in the liquid-collecting bottle, for liquid-collecting bottle provides negative pressure;
2) simultaneously, extraneous gas is imported in the liquid-collecting bottle;
3) the actual suction pressure value in the monitoring liquid-collecting bottle;
4) with actual suction pressure value and predetermined negative pressure value relatively, according to comparative result, by controlling simultaneously rate of air sucked in required and air inflow, actual suction pressure value in the liquid-collecting bottle is approached or reach predetermined negative pressure value.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the determined scope of claim.For those skilled in the art, without departing from the spirit and scope of the present invention, if can also make in improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. the negative pressure control apparatus of a negative pressure treatment system is characterized in that, comprising:
Extraction sector is by providing negative pressure to bleeding in the liquid-collecting bottle for liquid-collecting bottle;
Electrically-controlled valve is used for extraneous gas is imported in the liquid-collecting bottle;
Pressure monitoring module is used for the actual suction pressure value in the monitoring liquid-collecting bottle;
The negative pressure control module with actual suction pressure value and predetermined negative pressure value relatively, according to comparative result, is controlled the rate of air sucked in required of extraction sector and the air inflow of electrically-controlled valve simultaneously, actual suction pressure value in the liquid-collecting bottle is approached or reaches predetermined negative pressure value;
Negative pressure amplitude in the described negative pressure control module control negative pressure treatment process slowly diminishes, and is specially: along with treatment initial stage wound deterioration, serious situation finally the wound situation about taking a turn for the better that heals gradually change, the negative pressure value in the control negative pressure treatment process reduces.
2. the negative pressure control apparatus of negative pressure treatment as claimed in claim 1 system is characterized in that, described negative pressure control module comprises:
Operation processing unit compares actual suction pressure value and predetermined negative pressure value, according to comparative result, sends control instruction;
ECU is according to the rate of air sucked in required of described control instruction control extraction sector and the air inflow of electrically-controlled valve.
3. the negative pressure control apparatus of negative pressure treatment as claimed in claim 2 system is characterized in that, the speed of the motor of described ECU by controlling described extraction sector is controlled the rate of air sucked in required of extraction sector.
4. the negative pressure control apparatus of negative pressure treatment as claimed in claim 2 system is characterized in that, the size of the steam vent of described ECU by controlling described electrically-controlled valve is controlled air inflow.
5. the negative pressure control apparatus of negative pressure treatment as claimed in claim 2 system is characterized in that, described ECU is controlled the voltage of described extraction sector and the voltage of electrically-controlled valve, with the rate of air sucked in required of control extraction sector, the air inflow of electrically-controlled valve.
6. the negative pressure control apparatus of negative pressure treatment as claimed in claim 2 system is characterized in that, described ECU is controlled the electric current of described extraction sector and the electric current of electrically-controlled valve, with the rate of air sucked in required of control extraction sector, the air inflow of electrically-controlled valve.
7. the negative pressure control apparatus of negative pressure treatment as claimed in claim 5 system is characterized in that, described operation processing unit is provided with the DA module, is used for sending voltage signal to ECU.
8. the negative pressure control apparatus of negative pressure treatment as claimed in claim 5 system is characterized in that, described operation processing unit is provided with the PWM module, is used for sending voltage signal to ECU.
9. the negative pressure control apparatus of negative pressure treatment as claimed in claim 5 system is characterized in that, described operation processing unit is provided with the Control of Voltage current module, is used for sending current signal to ECU.
10. the negative pressure control apparatus of negative pressure treatment as claimed in claim 1 system is characterized in that described predetermined negative pressure value temporal evolution.
11. the negative pressure control apparatus of negative pressure treatment as claimed in claim 1 system is characterized in that the in time curved variation of described predetermined negative pressure value.
12. the negative pressure control apparatus of negative pressure treatment as claimed in claim 1 system is characterized in that, under the intermittent therapy pattern, the time of each treatment cycle experience diminishes gradually in the described negative pressure control module control intermittent therapy.
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| EP2711033A1 (en) * | 2012-09-25 | 2014-03-26 | Paul Hartmann AG | System for wound treatment |
| CN104626584B (en) * | 2015-01-26 | 2017-12-26 | 杭州先临三维科技股份有限公司 | A kind of scraper voltage-stabilizing system and its control method |
| CN104950935A (en) * | 2015-07-02 | 2015-09-30 | 徐成学 | Negative pressure drainage wound control system and pressure control method |
| EP3635733A1 (en) * | 2017-05-15 | 2020-04-15 | Smith & Nephew plc | Negative pressure wound therapy system using eulerian video magnification |
| CN110115779A (en) * | 2019-05-20 | 2019-08-13 | 刘云峰 | A kind of splanchnocoel liquid negative pressure pump means |
| CN111840676A (en) * | 2020-08-22 | 2020-10-30 | 苏州爱得科技发展股份有限公司 | A combined wound quality system of ozone and negative pressure drainage |
| CN118079120A (en) * | 2024-03-06 | 2024-05-28 | 深圳市路特佳成供应链管理有限公司 | A control method and device for a breast pump, a breast pump and a storage medium |
| CN119746179A (en) * | 2024-12-10 | 2025-04-04 | 苏州元禾医疗器械有限公司 | Accurate negative pressure regulating method and system for chronic wound surface |
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