CN217567046U - Breath simulation lung calibration device - Google Patents
Breath simulation lung calibration device Download PDFInfo
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- CN217567046U CN217567046U CN202220674345.5U CN202220674345U CN217567046U CN 217567046 U CN217567046 U CN 217567046U CN 202220674345 U CN202220674345 U CN 202220674345U CN 217567046 U CN217567046 U CN 217567046U
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Abstract
The utility model discloses a breathe simulation lung calibrating device relates to medical instrument technical field, including display screen, control system, servo motor actuating system, the piston device of deciding the volume that connects gradually. The fixed-volume piston device comprises a piston rod, a piston cavity, a simulation lung and a pipeline for connecting the piston cavity and the simulation lung, wherein the piston rod, the piston cavity, the simulation lung and the pipeline are sequentially connected, and the breathing gas control valve and the high-precision pressure sensor are installed on the pipeline. The motor driving system comprises a motor and a grating ruler. An active piston is adopted as a core, a position accurate driving technology of a servo motor and a grating ruler is utilized to output fixed-volume gas, a high-precision pressure sensor is combined to collect a pressure change curve of an air passage in real time when a human body breathing process is simulated, and a calibration result of the compliance of a simulated lung and the resistance of the air passage is accurately obtained.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to breathe simulation lung calibrating device.
Background
The calibration process related to human body breathing parameters in the field of medical measurement is very many, and particularly, on a breathing auxiliary device 'medical respirator' used for rescuing patients incapable of breathing autonomously, more respiratory physiological parameters are measured, and the device for simulating lung compliance and airway resistance in normal physiological or pathological state by breathing plays an important role in the work of clinical application, scientific research and development, quality control and the like of the respirator. At present, the respiratory parameters are generally calibrated by combining an airflow analyzer with a simulated lung in China, the research on a simulated lung calibration device is relatively less, and the problem that the compliance of two important simulation indexes of the simulated lung and the measurement performance of airway resistance reach the standard exists, so that the defect phenomenon of a calibration method exists.
Lung compliance is the change in lung volume caused by a change in unit pressure, and represents the effect of changes in thoracic pressure on lung volume, which reflects the degree of difficulty in changing the lung under external force. The lung has high compliance, which means that the lung has strong deformability, i.e. causes large deformation under the action of small external force. For luminal organs, high compliance means high expandability, and a small transmural pressure can cause a large change in luminal volume. Reduced lung compliance is seen in restrictive lung disease, alveolar filling disease, acute respiratory distress syndrome, and the like.
The most important factors clinically affecting airway resistance of respiratory tract mainly include air flow in the circulating airway, size of airway lumen, contraction and relaxation strength of respiratory muscle and the like. The resistance in the airway is mainly the resistance force generated by the airway when the gas is in the respiratory movement process, and under the normal condition, the airway resistance is-3 cmH2O/L/S. In pathological conditions, airway resistance is increased, such as chronic obstructive emphysema, chronic bronchitis, acute bronchitis, bronchial asthma, bronchopulmonary carcinoma, diffuse interstitial pulmonary fibrosis, pneumoconiosis, silicosis, and pneumothorax due to various traumas.
For the above reasons, in order to guarantee clinical application, scientific research and development and quality control of the ventilator, the simulated lung is needed to simulate physiological states of normal lung and pathological states, and the core points of the simulation are lung compliance and airway resistance, so it is very necessary to perform calibration of lung compliance and airway resistance.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a breathe simulation lung calibrating device provides the gaseous and synchronous test air flue resistance of deciding the volume, has solved the compliance and the air flue resistance problem of tracing to the source of simulation lung.
The utility model adopts the following technical proposal: the utility model provides a breathe simulation lung calibrating device, includes servo motor actuating system, decide volume piston device, breathe gas accuse valve, high accuracy pressure sensor, display screen and control system, connects gradually display screen, control system, servo motor actuating system, decide volume piston device, be equipped with on the volume piston device and breathe gas accuse valve and high accuracy pressure sensor. The control system controls the servo motor driving system to push the fixed volume piston device to operate, the breathing air control valve can control the entering or discharging of air in the fixed volume piston device, the high-precision pressure sensor is used for testing the pressure increment in the fixed volume piston device, and obtained data are displayed on the display screen.
Preferably, the fixed-volume piston device comprises a piston rod, a piston cavity, a simulated lung and a pipeline for connecting the piston cavity and the simulated lung, wherein the piston rod, the piston cavity, the simulated lung and the pipeline are sequentially connected, and the breathing pneumatic control valve and the high-precision pressure sensor are arranged on the pipeline. The piston rod can reciprocate in the piston cavity, so that the gas enters the simulated lung through the pipeline.
Preferably, the motor driving system comprises a motor and a grating ruler. The servo motor driving system pushes the piston rod to realize fixed-volume gas output through the precise positioning action of the grating ruler, and the advancing distance precision of the piston rod can reach micron-level by utilizing the grating ruler to measure the accuracy.
Preferably, the simulated lung is provided with a pressurizing plate, so that no gas space exists in the initial state of the simulated lung, and the influence of the initial gas in the simulated lung on the calibration result before the gas is injected into the piston rod is eliminated.
Preferably, the pipeline is a hard pipeline and is directly inserted into the simulated lung, the length of the pipeline is reduced as much as possible, and the influence of initial gas in the pipeline on a calibration result before the gas is injected into the piston rod is reduced.
The beneficial effects of the utility model are that: an active piston is adopted as a core, fixed-volume gas is output by utilizing the position accurate driving technology of a servo motor and a grating ruler, and a pressure change curve of an air passage is acquired in real time when a human body breathing process is simulated by combining a high-precision pressure sensor, so that a calibration result of the compliance of a simulated lung and the resistance of the air passage is accurately obtained.
Drawings
To illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention, and are not intended to limit the present invention.
FIG. 1 is a block diagram of the system of the present invention;
fig. 2 is a pressure curve outputted by the present invention.
In the figure:
1-display screen, 2-control system, 3-motor, 4-grating ruler, 5-piston rod, 6-piston cavity, 7-simulated lung, 8-breathing air control valve, 9-high precision pressure sensor.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention will be combined below to clearly and completely describe the technical solution of the embodiments of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1, a respiratory simulation lung calibration device comprises a servo motor driving system, a volume-fixed piston device, a respiratory pneumatic control valve 8, a high-precision pressure sensor 9, a display screen 1 and a control system 2, which are sequentially connected with the display screen 1, the control system 2, the servo motor driving system and the volume-fixed piston device. The volume-fixed piston device comprises a piston rod 5, a piston cavity 6, a simulation lung 7 and a pipeline for connecting the piston cavity 6 and the simulation lung 7, wherein the piston rod, the piston cavity 6 and the simulation lung 7 are sequentially connected, and a breathing air control valve 8 and a high-precision pressure sensor 9 are installed on the pipeline. The piston rod 5 is reciprocable in the piston chamber 6 to allow gas to pass through the conduit into the simulated lung 7. The motor driving system comprises a motor 3 and a grating ruler 4. The high-precision pressure sensor 9 is used for testing the pressure increment in the device and displaying the obtained data on a display screen.
The core of the whole system is a volume-fixed piston device, the motor 3 drives the piston rod 5 to realize volume-fixed gas output through the accurate positioning effect of the grating ruler 4, the gas enters a cavity of a calibrated simulation lung 7 after being output from the piston cavity 6, the volume-fixed piston cavity is designed with a flow generating device, and the cumulative volume of the injected gas in unit time is as follows:
in the formula: v is the accumulated volume; r is the radius of the piston cavity; h is the distance the piston rod is advanced.
Because the volume can produce corresponding pressure after being compressed in simulation lung 7, high accuracy pressure sensor 9 gathers the pressure change condition in real time, and the formula that can solve lung compliance is:
where Δ p represents the amount of change in lung pressure and Δ V represents the amount of change in simulated intra-pulmonary gas.
The compliance of the simulated lung 7 depends on two key parameters, pressure increase and volume increase, so accurate measurement of pressure and volume increase is required to improve the reliability of the measurement of the compliance of the simulated lung 7. The pressure increase can be accurately measured by the high-precision pressure sensor 9 on the pipe, but the gas volume needs to be considered a lot because the gas volume in the volumetric piston device cannot inject all the gas into the simulated lung 7 due to the existence of the connecting pipe, and therefore the related residual gas quantity needs to be calculated.
The volume of the piston cavity 6 is V 0 The pipeline is fixedly provided with quantitative gas V 1 Simulating the initial gas V stored in the lung 7 2 V in the piston cavity 6 by the action of the piston rod 5 0 All the gas is pushed away from the piston part, then V 0 Will be present in the duct and simulated lung 7, the simulated lung volume increase being V 3 . The gas molecular state equation can be known from the Kerbelon equation as follows:
pV＝nRT
from this equation, the number of molecules should be kept equal before and after the piston rod 5 is moved, and there is the following formula:
n 0 +n 1 +n 2 ＝n′ 1 +n′ 2 +n 3
in the formula: n is 0 For initial setting of piston chamber V 0 The number of gas molecules in the gas; n is 1 In an initial state 1 The number of gas molecules in the gas; n is 2 Simulating the initial volume V of the lung for the initial state 2 The number of gas molecules in the gas; n' 1 Pipeline cavity V for piston rod after gas injection 1 The number of gas molecules in the gas; n' 2 To move alivePipeline cavity V after gas is injected by plug rod 2 Number of gas molecules in.
The gas pressure balance before the piston rod 5 is pushed is p 0 The equilibrium gas pressure after bolus injection is p 1 In a short time, the temperature fluctuation of the gas is neglected and kept balanced, and the gas pressure and the temperature are brought into formula 1:
in the formula: Δ V X To simulate lung gas gain.
After finishing, the following can be obtained:
further, in the present invention,
p is to be 1 -p 0 Is expressed as Δ p X The arrangement is as follows:
lung compliance:
further finishing to obtain:
according to the derivation, the measurement of lung compliance is influenced by parameters such as system initial pressure, injected gas balance pressure, preset gas injection volume of the piston cavity 6, pipeline volume and simulated lung 7 initial volume.
The simulated lung 7 is provided with a pressurizing plate, so that no gas space exists in the initial state of the simulated lung 7, and the initial volume V in the simulated lung 7 is eliminated 2 Influence on the calibration results.
The method of joining sealed pipes with hoses commonly used in engineering applications can affect V 1 To reduce V 1 The influence factors brought by the pipeline are that the pipeline adopts a hard pipeline and is directly inserted into the simulated lung 7, the length of the pipeline is reduced as much as possible, and the V is reduced 1 The value of (b) improves the certainty of the measurement result.
The calibration device outputs a pressure curve resembling the breathing condition of a human body, the graph being shown in fig. 2.
After gas with a certain speed is output from the cylinder, peak pressure PIP exists in the simulated lung, and platform pressure Pplate exists after gas delivery is stopped, and the airway resistance can be calculated through the following formula:
R＝(PIP-Pplat)/Vflow
where Vflow represents the output gas velocity.
The speed of the gas output by the calibrating device can be calibrated by controlling the advancing speed of the stepping motor by an embedded system, and the accuracy of the speed is set by the set volume V 0 And the time t for the motor 3 to inject the gas is determined, and the following can be known:
the airway resistance calculation method can be further elaborated by the volume definition of the piston cavity 6,
in the formula: PIP and Ppal are measured by pipeline pressure sensor, radius is measured by micrometer, and advance distance d h The accuracy of measurement by using a grating ruler can reach micron level.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical essence of the present invention will still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The utility model provides a breathe simulation lung calibrating device, its characterized in that includes servo motor actuating system, decides volume piston device, breathes gas accuse valve (8), high accuracy pressure sensor (9), display screen (1) and control system (2), connects gradually display screen (1), control system (2), servo motor actuating system, decide volume piston device, it is equipped with breathing gas accuse valve (8) and high accuracy pressure sensor (9) on the piston device to decide.
2. A breath simulated lung calibration device according to claim 1, wherein the volumetric piston device comprises a piston rod (5), a piston cavity (6), a simulated lung (7) and a pipeline for connecting the piston cavity (6) and the simulated lung (7) which are connected in sequence, and the breath pneumatic control valve (8) and the high-precision pressure sensor (9) are mounted on the pipeline.
3. A respiratory simulated lung calibration device according to claim 1 wherein said servo motor drive system comprises a motor (3) and a grating scale (4).
4. A breathing simulated lung calibration device as claimed in claim 1 wherein said simulated lung (7) is provided with a compression plate.
5. A breathing simulated lung calibration device according to claim 2 wherein said tube is a rigid tube and is inserted straight into the simulated lung (7).
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| CN202220674345.5U CN217567046U (en) | 2022-03-25 | 2022-03-25 | Breath simulation lung calibration device |
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| CN202220674345.5U CN217567046U (en) | 2022-03-25 | 2022-03-25 | Breath simulation lung calibration device |
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| CN217567046U true CN217567046U (en) | 2022-10-14 |
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Address after: No. 102, 1st Floor, Building 8, No. 38, Jinke South Road, Jinniu Hi tech Industrial Park, Chengdu, Sichuan 610,036 Patentee after: Sichuan Zhongce Instrument Technology Co.,Ltd. Address before: 610000 No. 102, floor 1, building 8, No. 38, Jinke South Road, Jinniu high tech Industrial Park, Chengdu, Sichuan Patentee before: Sichuan ruijingte Technology Co.,Ltd. |