CN102580212B - Adjustable flow restrictor applied to independent lung ventilation - Google Patents
Adjustable flow restrictor applied to independent lung ventilation Download PDFInfo
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- CN102580212B CN102580212B CN201210070683.9A CN201210070683A CN102580212B CN 102580212 B CN102580212 B CN 102580212B CN 201210070683 A CN201210070683 A CN 201210070683A CN 102580212 B CN102580212 B CN 102580212B
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- adjustable
- fore shell
- distance
- diaphragm
- back cover
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Abstract
The invention discloses an adjustable flow restrictor applied to independent lung ventilation, which comprises a front shell, a distance-adjustable rear shell and a control diaphragm, wherein an airflow inlet communicated with a breathing machine is arranged on the front shell, and an airflow outlet communicated with an air tube is arranged on the distance-adjustable rear shell; the center of the control diaphragm is provided with a round hole, and the control diaphragm is arranged at the rear end in the front shell; and the distance-adjustable rear shell is arranged at the rear end of the front shell and can horizontally move forwards and backwards along the front shell, so that the distance between the distance-adjustable rear shell and the control diaphragm can be adjusted. The adjustable flow restrictor is simple and is easily operated, the implementation cost is low, only one breathing machine is used for synchronous-ventilation of bilateral lungs, the inspiration flow of either lung can be independently adjusted, and the expiration of a patient is not influenced. The adjustable flow restrictor can obviously reduce the difference of the inspiration flow between different-compliance bilateral lungs and meanwhile effectively reduces airway opening pressure and intrapulmonary pressure of the flow restriction side.
Description
Technical field
The present invention relates to mechanical ventilation technology field, more particularly, it relates to a kind of by controllability unipolarity restriction throughput, does not affect the resistance of Returning flow, adjustable type current limiter that can each side pulmonary aspiration flow of independent regulation.
Background technology
The pathological characteristic of one-sided property lung disease (unilateral lung disease, ULD) is that only a side lung exists pathological changes or becomes master with a side pneumonopathy.Conventional ventilation method applies with identical pressure two lungs, its flow distribution depends on the compliance of bilateral and the combined influence of airway resistance, likely can not reach enough gas exchanges, even can make gas exchange be worse off, and the relatively normal side lung of damage.Dividing side pulmonary ventilation (differential lung ventilation, DLV) is a kind of technology that each side lung is carried out independent ventilation or optionally a side lung ventilated.Conventionally for the patient of or asymmetry lung disease one-sided through radiodiagnosis alleged occurrence, possessing one of following condition is feasible DLV: 1. suck high concentration oxygen and apply PEEP and can not improve hypoxemia; 2. PEEP causes oxygenate to be worse off or shunts and increase the weight of; 3. strong side Hyperinflation and/or the Ipsilateral pulmonary collapse; 4. PEEP causes circulatory condition obviously to worsen; 5. there is side refractory pneumothorax or a bronchopleural fistula.Also have author to recommend, for PAO2/FiO2 lower than 150 ULD patient, feasible DLV.
Common DLV technology has following several at present: 1. continuous positive airway pressure (CPAP) method: insert Dual-channel tracheal cannula (DLT), retain autonomous respiration, bilateral pulmonary is applied respectively to the CPAP of varying level.But this method need to have enough autonomous respirations, for critical patient, because need application tranquilizer and muscle relaxant are beneficial to intubate and management, make its application limited.2. part flow arrangement method: implement and divide side pulmonary ventilation and a point side PEEP with a respirator and a part flow arrangement.The shortcoming of this kind point side pulmonary ventilation scheme is: because loop forms complexity, therefore easily leak gas and come off, and being difficult to monitoring ventilation mechanics; Resistance current-limiting apparatus in loop can form the resistance to exhaling, and may cause PEEP to increase, and makes strong side Hyperinflation, build-up of pressure damage.3. two respirators synchronously divide side venting method: with two respirators, bilateral pulmonary is implemented to synchronous point side and ventilate.This kind of method need make two respirators synchronous with the timing circuit of customization, only has at present the respirator of part costliness to have this function, thereby is difficult to popularize.4. two asynchronous point of side venting methods of respirator: with two respirators, bilateral pulmonary is implemented to asynchronous point of side and ventilate.But asynchronous due to bilateral ventilation, affects ventilatory effect; Also may be because pendular movement of mediastinum impact circulation limits its application.5. additive method: for example, conventional ventilation is combined one-sided high frequency ventilation method.This method is inserted Ipsilateral bronchus by a conduit by standard endotracheal tube, in carrying out conventional ventilation support, Ipsilateral lung is applied to high frequency jet ventilation (high-frequency jet ventilation, HFJV).This kind of method also needs to apply two respirators, and HFJV is difficult to the parameter of the ventilations such as regulating and controlling ventilating amount, and having relatively high expectations to ventilation management.
Visible, existing DLV technology remains the defect that is difficult to overcome many, causes this kind of ventilating technology limited in clinical practice, therefore develops a kind of new DLV solution and supports significant for the ventilation of ULD.
Consult Fig. 1 and Fig. 2, Starling in 1912 etc. have implemented classical starling resistor and have tested to study flow restriction phenomenon
[47].One section has elastic pipe ends and is connected between two sections of hard pipelines, is sealed in a chamber room pressure p
e(seeing Fig. 1) and upstream pressure (p
u) be communicated with.By additional Pressure Drop p
u-p
ddrive the fluid that flow is Q to pass through this equipment, the Reynolds number (Reynold number) of fluid is 10
2-10
4.Provide additional upstream and downstream resistance at hard pipe section with valve, (be respectively p with the pressure of controlling the pipeline upstream and downstream that can subside
1and p
2).(p when without any flow
u=p
d), p
eincrease the compression stress that can produce tube wall, make its cross section become ellipse (being connected in the two ends shape invariance of hard pipeline) from circle.Tubingcompliance after distortion increases, therefore p
eslight change can cause the very big variation of the long-pending α of pipeline section.Further compression causes relative tube wall to be affixed, and when initial, is a bit affixed, and is then wire along pipe longitudinal axis and is affixed (seeing Fig. 2).Once tube wall is affixed, tubingcompliance reduces, and produces and hinders the long-pending resistance reducing of pipeline section.If there is fluid to be driven through starling resistor (p
u> p
d, see Fig. 1), work as p
ewhile increasing, the downstream of the pipeline that can subside (intrinsic pressure minimum herein) is first shunk (seeing Fig. 2).Afterwards, if increase the Pressure Drop p along pipeline
1-p
2, upstream transmural pressure p
1-p
econstant, can cause " flow restriction ", the maximum of flow Q is limited; If increase flow Q, p
2-p
econstant, cause " Pressure Drop is limited ", i.e. p
1-p
2maximum limited.But, in prior art, there is not yet the dependency structure of above-mentioned principle.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of simple, implementation cost cheap, only with a respirator, bilateral pulmonary synchronized ventilation, can each side lung of independent regulation inspiratory flow and do not affect the adjustable type current limiter in point side pulmonary ventilation that is applied to of patient's expiration, this adjustable type current limiter can reduce the difference of inspiratory flow between the bilateral pulmonary of different compliances significantly, effectively reduces the air flue opening of current limliting side simultaneously and presses and intrapulmonic pressure.
Technical scheme of the present invention is achieved in that
A kind of adjustable type current limiter being applied in point side pulmonary ventilation, it comprises the back cover of fore shell, adjustable distance and controls diaphragm, on described fore shell, be provided with the air flow inlet for being communicated with respirator, and, on the back cover of described adjustable distance, be provided with the air stream outlet being communicated with trachea, and, be provided with circular hole at the center of described control diaphragm; Described control diaphragm is arranged on the rear end in fore shell, and the back cover of described adjustable distance is contained in fore shell rear end and can makes along described fore shell to forward and backward horizontal anomalous movement the back cover of this adjustable distance and control the distance scalable between diaphragm; In the time that the air flow inlet of air-flow on fore shell enters and pass through to control big hole on diaphragm and small sircle hole, control diaphragm and subside to the back cover direction of adjustable distance.
In described fore shell, be provided with double flute, described control diaphragm is the chimeric rear end that is arranged on described fore shell.
The back cover of described adjustable distance is to adopt the mode being threaded to be arranged on described fore shell rear end.
The back cover of described fore shell, adjustable distance is to be all made up of stainless steel material.
Described circular hole comprises big hole and small sircle hole.
Described control diaphragm is that silica gel material is made, and its thickness is 0.1mm-0.4mm.
The thickness of described control diaphragm is 0.3mm.
The present invention is owing to having adopted said structure, therefore it has following beneficial effect:
(1) current limiter of the present invention utilizes " flow restriction " characteristic of starling resistor, make the flow of supplying gas of respirator be maintained at a certain fixing horizontal within the scope of certain driving pressure, back cover by changing adjustable distance and the distance of control between diaphragm are to provide different flow restriction scopes simultaneously, meet actual current limliting needs, realize the resistance that does not affect Returning flow so that different flow restriction scopes to be provided.
(2) ventilating return between current limiter of the present invention and respirator is simple, thereby dependable performance, potential failure rate is low, and cost that can be cheap is realized the inspiratory flow restriction to a side lung, partly realizes the object of DLV.
(3) only can realize bilateral pulmonary synchronized ventilation with a respirator by current limiter of the present invention, and flow that can each side lung of independent regulation and tidal volume accordingly.
Reading by reference to the accompanying drawings after the detailed description of embodiments of the present invention, it is clearer that the features and advantages of the invention will become.
Brief description of the drawings
Fig. 1 is the principle schematic of existing flow restriction;
Fig. 2 is about transmural pressure p-p in the flow restriction principle shown in Fig. 1
eschematic diagram with the relation of sectional area α;
Fig. 3 is the structure chart of embodiments of the present invention;
Fig. 4 is that the present invention installs and uses the schematic diagram under state.
Wherein:
The back cover 2 of respirator 100, current limiter 200, flow head 300, test lung 400, fore shell 1, air flow inlet 11, adjustable distance, air stream outlet 21, control diaphragm 3, big hole 32, small sircle hole 31.
Detailed description of the invention
With an embodiment, the present invention is further detailed explanation below, but should illustrate, protection scope of the present invention is not limited only to this.
As shown in Figure 3 to Figure 4, a kind of adjustable type current limiter being applied in point side pulmonary ventilation, this current limiter 200 comprises the back cover 2 of fore shell 1, adjustable distance and controls diaphragm 3, on described fore shell 1, be provided with the air flow inlet 11 for being communicated with respirator 100, and, the air stream outlet 21 being communicated with trachea on the back cover 2 of described adjustable distance, be provided with, and, center at described control diaphragm 3 is provided with circular hole, and wherein, circular hole comprises big hole 32 and small sircle hole 31; Described control diaphragm 3 is arranged on the rear end in fore shell 1, the back cover 2 of described adjustable distance is contained in fore shell 1 rear end and can makes along described fore shell 1 to forward and backward horizontal anomalous movement the back cover 2 of this adjustable distance and control the distance scalable between diaphragm 3, in the time that the air flow inlet 11 of air-flow on fore shell 1 enters and pass through to control big hole 32 on diaphragm 3 and small sircle hole 31, control diaphragm 3 and subside to back cover 2 directions of adjustable distance.Wherein, can in described fore shell 1, be provided with double flute, described control diaphragm 3 is chimeric rear ends that are arranged on described fore shell 1, and the back cover 2 of adjustable distance can adopt the mode being threaded to be arranged on described fore shell 1 rear end.The back cover 2 of described fore shell 1, adjustable distance is to be all made up of stainless steel material; Control diaphragm 3 and make for silica gel material, its thickness is 0.1mm-0.4mm, if the thickness of controlling diaphragm 3 is 0.3mm.
Basic functional principle of the present invention is: in the time that the air flow inlet 11 of air-flow on fore shell 1 enters and pass through to control big hole 32 on diaphragm 3 and small sircle hole 31, controlling diaphragm 3 subsides to back cover 2 directions of adjustable distance, now, control the Distance Shortened between diaphragm 3 and back cover 2 inwalls of adjustable distance.According to starling resistor principle, when this subsides while acquiring a certain degree, the distance of controlling between diaphragm 3 and the back cover 2 of adjustable distance is maintained at certain level, therefore the flow at air stream outlet 21 places on the back cover 2 of adjustable distance is also restricted to certain level thereupon, no longer increasing and increase with aspirated pressure.
In the present invention, the back cover 2 of adjustable distance can regulate it and control the distance between diaphragm 3 by rotation mode; Control big hole 32 and the small sircle hole 31 air feed streams at diaphragm 3 centers and pass through, and prevent from controlling diaphragm 3 and paste completely with the back cover 2 of adjustable distance; Air flow inlet air feed stream on fore shell 1 passes through; Air stream outlet air feed stream on the back cover 2 of adjustable distance passes through.
Although described by reference to the accompanying drawings embodiments of the present invention; but those skilled in the art can make various distortion or amendment within the scope of the appended claims; as long as be no more than the described protection domain of claim of the present invention, all should be within protection scope of the present invention.
Claims (7)
1. the adjustable type current limiter being applied in point side pulmonary ventilation, it is characterized in that: it comprises the back cover of fore shell, adjustable distance and controls diaphragm, on described fore shell, be provided with the air flow inlet for being communicated with respirator, and, on the back cover of described adjustable distance, be provided with the air stream outlet being communicated with trachea, and, be provided with circular hole at the center of described control diaphragm; Described control diaphragm is arranged on the rear end in fore shell, and the back cover of described adjustable distance is contained in fore shell rear end and can makes along described fore shell to forward and backward horizontal anomalous movement the back cover of this adjustable distance and control the distance scalable between diaphragm; In the time that the air flow inlet of air-flow on fore shell enters and pass through to control big hole on diaphragm and small sircle hole, control diaphragm and subside to the back cover direction of adjustable distance.
2. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 1, is characterized in that: in described fore shell, be provided with double flute, described control diaphragm is the chimeric rear end that is arranged on described fore shell.
3. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 1 and 2, is characterized in that: the back cover of described adjustable distance is to adopt the mode being threaded to be arranged on described fore shell rear end.
4. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 3, is characterized in that: the back cover of described fore shell, adjustable distance is to be all made up of stainless steel material.
5. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 3, is characterized in that: described circular hole comprises big hole and small sircle hole.
6. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 3, is characterized in that: described control diaphragm is that silica gel material is made, and its thickness is 0.1mm-0.4mm.
7. a kind of adjustable type current limiter being applied in point side pulmonary ventilation according to claim 5, is characterized in that: the thickness of described control diaphragm is 0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210070683.9A CN102580212B (en) | 2012-03-16 | 2012-03-16 | Adjustable flow restrictor applied to independent lung ventilation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210070683.9A CN102580212B (en) | 2012-03-16 | 2012-03-16 | Adjustable flow restrictor applied to independent lung ventilation |
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| Publication Number | Publication Date |
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| CN102580212A CN102580212A (en) | 2012-07-18 |
| CN102580212B true CN102580212B (en) | 2014-09-03 |
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| CN201210070683.9A Expired - Fee Related CN102580212B (en) | 2012-03-16 | 2012-03-16 | Adjustable flow restrictor applied to independent lung ventilation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022204798A1 (en) * | 2021-03-29 | 2022-10-06 | Cae Healthcare Canada Inc. | Airway resistance device |
| WO2023173225A1 (en) * | 2022-03-18 | 2023-09-21 | Academie Saint-Bernard Inc. | Remote first aid training and manikin designs |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109107007A (en) * | 2018-07-10 | 2019-01-01 | 上海敏恒企业咨询有限公司 | A kind of intelligence APRVplus breathing machine ventilation system and application method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6105582A (en) * | 1998-07-28 | 2000-08-22 | Pranevicius; Osvaldas | Cerebral blood outflow maintenance during intracranial hypertension |
| CN102029090A (en) * | 2009-09-28 | 2011-04-27 | 博锐特股份有限公司 | Flow regulating device for water purifier |
| CN202459698U (en) * | 2012-03-16 | 2012-10-03 | 广州医学院第一附属医院 | Adjustable current limiter applied to independent lung ventilation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8025053B1 (en) * | 2003-06-26 | 2011-09-27 | Mine Safety Appliances Company | Pressure regulator assembly |
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2012
- 2012-03-16 CN CN201210070683.9A patent/CN102580212B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6105582A (en) * | 1998-07-28 | 2000-08-22 | Pranevicius; Osvaldas | Cerebral blood outflow maintenance during intracranial hypertension |
| CN102029090A (en) * | 2009-09-28 | 2011-04-27 | 博锐特股份有限公司 | Flow regulating device for water purifier |
| CN202459698U (en) * | 2012-03-16 | 2012-10-03 | 广州医学院第一附属医院 | Adjustable current limiter applied to independent lung ventilation |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022204798A1 (en) * | 2021-03-29 | 2022-10-06 | Cae Healthcare Canada Inc. | Airway resistance device |
| US11842654B2 (en) | 2021-03-29 | 2023-12-12 | Cae Healthcare Canada Inc. | Airway resistance device |
| WO2023173225A1 (en) * | 2022-03-18 | 2023-09-21 | Academie Saint-Bernard Inc. | Remote first aid training and manikin designs |
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| Publication number | Publication date |
|---|---|
| CN102580212A (en) | 2012-07-18 |
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Granted publication date: 20140903 Termination date: 20170316 |