CN102580212A - Adjustable flow restrictor applied to independent lung ventilation - Google Patents
Adjustable flow restrictor applied to independent lung ventilation Download PDFInfo
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- CN102580212A CN102580212A CN2012100706839A CN201210070683A CN102580212A CN 102580212 A CN102580212 A CN 102580212A CN 2012100706839 A CN2012100706839 A CN 2012100706839A CN 201210070683 A CN201210070683 A CN 201210070683A CN 102580212 A CN102580212 A CN 102580212A
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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 the mechanical ventilation technical field, more particularly, it relates to a kind of through controllability unipolarity restriction throughput, does not influence the resistance of Returning flow, but the adjustable type current limiter of each side pulmonary aspiration flow of independent regulation.
Background technology
(unilateral lung disease, pathological characteristic ULD) are that only there is pathological changes in a side lung or becomes the master with a side pneumonopathy to one-sided property lung disease.The 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; Might can not reach enough gas exchanges, even gas exchange is worse off, and the normal relatively side lung of damage.(differential lung ventilation DLV) is a kind of technology that each side lung is carried out independent ventilation or optionally a side lung ventilated to divide the side pulmonary ventilation.Usually for the patient of or asymmetry lung disease one-sided through the radiodiagnosis alleged occurrence, possessing one of following condition is feasible DLV: 1. suck high concentration oxygen and Using P EEP can not improve hypoxemia; 2. PEEP causes oxygenate to be worse off or shunts and increase the weight of; 3. the strong side lung excessive expansion and/or the Ipsilateral pulmonary collapse; 4. PEEP causes circulatory condition obviously to worsen; 5. there are intractable pneumothorax of a side or bronchopleural fistula.Also there is the author to recommend, is lower than 150 ULD patient, feasible DLV for PAO2/FiO2.
At present common DLV technology has following several kinds: 1. continuous positive airway pressure (CPAP) method: insert two-chamber tracheal intubation (DLT), keep autonomous respiration, the bilateral lung is applied the CPAP of varying level respectively.But this method needs enough autonomous respirations, for critical patient, uses tranquilizer and muscle relaxant is beneficial to intubate and management because of need, makes its limited use.2. part flow arrangement method: implement with a respirator and a part flow arrangement and to divide the side pulmonary ventilation and to divide side PEEP.The shortcoming of this kind branch side pulmonary ventilation scheme is: because that the loop constitutes is complicated, therefore leaks gas easily and come off, and be difficult to monitoring ventilation mechanics; Resistance current-limiting apparatus in the loop can form the resistance of exhaling, and possibly cause PEEP to increase, and makes strong side lung excessive expansion, the build-up of pressure damage.3. two respirators divide the side venting method synchronously: with two respirators the bilateral lung is implemented branch side ventilation synchronously.This kind method needs to make two respirators synchronous with the timing circuit of customization, has only the expensive respirator of part to have this function at present, thereby is difficult to popularize.4. two asynchronous minute side venting methods of respirator: the bilateral lung is implemented side ventilation in asynchronous minute with two respirators.But, influence ventilatory effect because the bilateral ventilation is asynchronous; Also maybe be because pendular movement of mediastinum influence circulation limits its application.5. additive method: for example, conventional ventilation is united one-sided high frequency ventilation method.This method is inserted the Ipsilateral bronchus with a conduit through the standard endotracheal tube, carrying out when conventional ventilation supports, to the Ipsilateral lung apply high frequency jet ventilation (high-frequency jet ventilation, HFJV).This kind method also need be used two respirators, and HFJV is difficult to the parameter of ventilation such as regulating and controlling ventilating amount, and having relatively high expectations to the ventilation management.
It is thus clear that existing DLV technology remains the defective that is difficult to overcome many, cause this kind ventilating technology limited in clinical practice, therefore develop a kind of new DLV solution and support significant for the ventilation of ULD.
Consult Fig. 1 and Fig. 2, Starling in 1912 etc. have implemented classical starling resistor experiment with research flow restriction phenomenon
[47]One section rubber-like pipe ends is connected between two sections hard pipelines, is sealed in the chamber room pressure p
e(see figure 1) and upstream pressure (p
u) be communicated with.P falls in the pressure through adding
u-p
dThe driving flow is that the fluid of Q passes through this equipment, and fluidic Reynolds number (Reynold number) is 10
2-10
4With valve additional upstream and downstream resistance is provided at the hard pipe section, (is respectively p with the pressure of controlling the pipeline upstream and downstream that to subside
1And p
2).(p when no any flow
u=p
d), p
eIncrease the compression stress that can produce, make its cross section become ellipse (being connected in the two ends shape invariance of hard pipeline) from circle to tube wall.Tubingcompliance after the distortion increases, so p
eSlight change can cause the very big variation of the long-pending α of pipeline section.Further compression causes relative tube wall to paste mutually, a bit pastes mutually when initial, is wire along pipe longitudinal axis then and pastes (see figure 2) mutually.In case tube wall pastes mutually, then tubingcompliance reduces, and produces to hinder the long-pending resistance that reduces of pipeline section., if there is fluid to be driven through starling resistor (p
u＞p
d, see Fig. 1), then work as p
eWhen increasing, the downstream of the pipeline that can subside (intrinsic pressure here minimum) is at first shunk (see figure 2).Afterwards, if increase along the pressure of pipeline p falls
1-p
2, upper reaches transmural pressure p
1-p
eConstant, can cause " flow restriction ", promptly the maximum of flow Q is limited; If increase flow Q, p
2-p
eConstant, then cause " pressure falls limited ", i.e. p
1-p
2Maximum limited.Yet, do not see the dependency structure of above-mentioned principle in the prior art as yet.
Summary of the invention
But the technical problem that the present invention will solve provide a kind of simple, implementation cost cheap, only with the inspiratory flow of a respirator, each side lung of bilateral lung synchronized ventilation independent regulation and do not influence the adjustable type current limiter in the pulmonary ventilation of branch side that is applied to of patient's expiration; This adjustable type current limiter can reduce the difference of inspiratory flow between the bilateral lung 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 that is applied in the pulmonary ventilation of branch side; It comprises the back cover and the control diaphragm of fore shell, adjustable distance; On said fore shell, be provided with and be used for the air flow inlet that is communicated with respirator, and, the air stream outlet that is communicated with trachea on the back cover of said adjustable distance, be provided with; And, be provided with circular hole at the diaphragm-operated center of said control; Said control diaphragm is arranged on the rear end in the fore shell, the back cover that the back cover of said adjustable distance is contained in the fore shell rear end and can makes this adjustable distance to forward and backward horizontal anomalous movement along said fore shell with control between the diaphragm apart from scalable.
In said fore shell, be provided with double flute, said control diaphragm is the chimeric rear end that is arranged on said fore shell.
The back cover of said adjustable distance is to adopt the mode that is threaded to be installed in said fore shell rear end.
The back cover of said fore shell, adjustable distance all is to be processed by stainless steel material.
Said circular hole comprises big hole and small sircle hole.
Said control diaphragm is that silica gel material is processed, and its thickness is 0.1mm-0.4mm.
The diaphragm-operated thickness of said control is 0.3mm.
The present invention is owing to having adopted said structure, so 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 in certain driving pressure scope, be maintained at a certain fixing horizontal; Simultaneously the back cover through changing adjustable distance with control distance between the diaphragm so that different flow restriction scopes to be provided; Satisfy actual current limliting needs, the resistance of realizing not influencing Returning flow is to provide different flow restriction scopes.
(2) ventilating return between current limiter of the present invention and the respirator is simple, thereby dependable performance, and potential fault rate is low, can less cost realize the inspiratory flow restriction to a side lung, partly realizes the purpose of DLV.
(3) only can realize bilateral lung synchronized ventilation by current limiter of the present invention with a respirator, but and the flow of each side lung of independent regulation and corresponding tidal volume.
After the detailed description that combines advantages embodiment of the present invention, it is clearer that characteristics of the present invention and advantage will become.
Description of 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 Figure 1
eSketch map with the relation of sectional area α;
Fig. 3 is the structure chart of embodiment of the present invention;
Fig. 4 installs and uses the sketch map under the state for the present invention.
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.
The specific embodiment
With an embodiment the present invention is done further detailed explanation below, but should explain that protection scope of the present invention is not limited only to this.
To shown in Figure 4, a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side, this current limiter 200 comprise the back cover 2 and the control diaphragm 3 of fore shell 1, adjustable distance like Fig. 3; On said fore shell 1, be provided with and be used for the air flow inlet 11 that is communicated with respirator 100, and, the air stream outlet 21 that is communicated with trachea on the back cover 2 of said adjustable distance, be provided with; And; Center at said control diaphragm 3 is provided with circular hole, and wherein, circular hole comprises big hole 32 and small sircle hole 31; Said control diaphragm 3 is arranged on the rear end in the fore shell 1; The back cover 2 that the back cover 2 of said adjustable distance is contained in fore shell 1 rear end and can makes this adjustable distance to forward and backward horizontal anomalous movement along said fore shell 1 with control between the diaphragm 3 apart from scalable; Wherein, can in said fore shell 1, be provided with double flute, said control diaphragm 3 is chimeric rear ends that are arranged on said fore shell 1; And the back cover 2 of adjustable distance can adopt the mode that is threaded to be installed in said fore shell 1 rear end.The back cover 2 of said fore shell 1, adjustable distance all is to be processed by stainless steel material; Control diaphragm 3 is processed for silica gel material, and its thickness is 0.1mm-0.4mm, is 0.3mm like the thickness of controlling diaphragm 3.
Basic functional principle of the present invention is: when the air flow inlet 11 of air-flow on fore shell 1 gets into and through the big hole 32 on the control diaphragm 3 during with small sircle hole 31; Control diaphragm 3 subsides to back cover 2 directions of adjustable distance; At this moment, the reduced distances between back cover 2 inwalls of control diaphragm 3 and adjustable distance.According to starling resistor principle; When this subsides when acquiring a certain degree; Distance between the back cover 2 of control diaphragm 3 and adjustable distance promptly is maintained at certain level; Therefore the flow at air stream outlet 21 places on the back cover 2 of adjustable distance also is 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 be regulated it and control the distance between the diaphragm 3 by rotation mode; The big hole 32 at control diaphragm 3 centers passes through with small sircle hole 31 air feed stream, and prevents to control diaphragm 3 and paste fully with the back cover 2 of adjustable distance; Air flow inlet air feed stream on the fore shell 1 passes through; Air stream outlet air feed stream on the back cover 2 of adjustable distance passes through.
Though described embodiment of the present invention in conjunction with accompanying drawing; But those skilled in the art can make various distortion or modification 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. adjustable type current limiter that is applied in the pulmonary ventilation of branch side; It is characterized in that: it comprises the back cover and the control diaphragm of fore shell, adjustable distance; On said fore shell, be provided with and be used for the air flow inlet that is communicated with respirator, and, the air stream outlet that is communicated with trachea on the back cover of said adjustable distance, be provided with; And, be provided with circular hole at the diaphragm-operated center of said control; Said control diaphragm is arranged on the rear end in the fore shell, the back cover that the back cover of said adjustable distance is contained in the fore shell rear end and can makes this adjustable distance to forward and backward horizontal anomalous movement along said fore shell with control between the diaphragm apart from scalable.
2. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 1 is characterized in that: in said fore shell, be provided with double flute, said control diaphragm is the chimeric rear end that is arranged on said fore shell.
3. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 1 and 2 is characterized in that: the back cover of said adjustable distance is to adopt the mode that is threaded to be installed in said fore shell rear end.
4. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 3, it is characterized in that: the back cover of said fore shell, adjustable distance all is to be processed by stainless steel material.
5. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 3, it is characterized in that: said circular hole comprises big hole and small sircle hole.
6. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 3 is characterized in that: said control diaphragm is that silica gel material is processed, and its thickness is 0.1mm-0.4mm.
7. a kind of adjustable type current limiter that is applied in the pulmonary ventilation of branch side according to claim 5, it is characterized in that: the diaphragm-operated thickness of said control 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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| CN102580212A true CN102580212A (en) | 2012-07-18 |
| CN102580212B 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 (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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3178336C (en) * | 2021-03-29 | 2023-07-25 | Cae Healthcare Canada Inc. | Airway resistance device |
| CA3152663A1 (en) * | 2022-03-18 | 2023-09-18 | Academie Saint-Bernard Inc. | Remote first aid training and manikin designs |
Citations (4)
| 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 |
| WO2005000409A1 (en) * | 2003-06-26 | 2005-01-06 | Mine Safety Appliances Company | Pressure regulator assembly |
| 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 |
-
2012
- 2012-03-16 CN CN201210070683.9A patent/CN102580212B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| WO2005000409A1 (en) * | 2003-06-26 | 2005-01-06 | Mine Safety Appliances Company | Pressure regulator assembly |
| 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 (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 |
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| CN102580212B (en) | 2014-09-03 |
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