A continuously adjustable active and passive integrated simulated lung device

Abstract

This invention discloses an integrated active and passive simulated lung device with continuously adjustable respiratory parameters, comprising: a base, two flow sensors, two flow proportional valves, two air bladders, two pressure sensors, two linear motors, two displacement sensors, and a controller. The two linear motors drive the two air bladders to produce periodic expansion and contraction movements, simulating the active and passive intake and exhaust functions of the left and right lungs in the human body. Furthermore, the respiratory rate can be adjusted by regulating the movement frequency of the linear motors. The linear motors, in conjunction with the pressure and displacement sensors, can accurately regulate the pressure within the air bladders; the flow proportional valves, in conjunction with the flow sensors, can accurately regulate the airflow into and out of the air bladders; and through the adjustment of pressure and flow, continuous adjustment of compliance and air resistance can be achieved, ultimately realizing continuous adjustment of respiratory parameters throughout the entire breathing process.

Description

Technical Field

[0001] This invention relates to the field of medical testing device technology, and more specifically to an integrated active and passive simulated lung device with continuously adjustable respiratory parameters. Background Technology

[0002] Ventilators are essential equipment for treating respiratory diseases, and their development and testing rely heavily on a key instrument—the simulated lung. Furthermore, simulated lungs are widely used in lung function testing, ventilator efficacy evaluation, and clinical medical teaching and research.

[0003] Currently, domestic and international simulated lungs employ a passive approach, meaning they can only simulate passive breathing without conscious effort. However, medical device testing requires not only evaluating the device's performance in the absence of conscious breathing but, more importantly, testing its cooperation with the body when some degree of voluntary breathing is present. Furthermore, human respiratory parameters (such as inspiratory pressure, inspiratory volume, respiratory rate, compliance, and air resistance) constantly change during inhalation and exhalation. Current passive simulated lungs only have fixed compliance and air resistance, failing to achieve continuous adjustment of respiratory parameters throughout the entire breathing process. Therefore, current passive, fixed-parameter simulated lungs cannot accurately simulate human respiratory function, negatively impacting the development, testing, efficacy evaluation, and clinical teaching of respiratory-related medical devices.

[0004] Therefore, how to provide a continuously adjustable active and passive integrated simulated lung device that can accurately simulate human respiratory function and facilitate the development, testing, effect evaluation, and clinical teaching of respiratory-related medical devices is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides an integrated active and passive simulated lung device with continuously adjustable respiratory parameters that can accurately simulate human respiratory function, facilitating the development, testing, effect evaluation, and clinical teaching of respiratory-related medical devices.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A continuously adjustable active-passive integrated simulated lung device includes:

[0008] The base has a first air inlet / outlet channel and a second air inlet / outlet channel inside. One end of the first air inlet / outlet channel is connected to a first flow sensor, and one end of the second air inlet / outlet channel is connected to a second flow sensor. Both the first flow sensor and the second flow sensor are connected to air inlet / outlet pipes.

[0009] A first flow proportional valve is disposed at the top of the base, and the valve port of the first flow proportional valve is connected to the first inlet and outlet air passage.

[0010] The second flow proportional valve is disposed at the top of the base, and the valve port of the second flow proportional valve is connected to the second inlet and outlet air passage.

[0011] A simulated left lung air sac, wherein the lower opening of the simulated left lung air sac is connected to the other end of the first air inlet / outlet channel, and a first pressure sensor is connected to the simulated left lung air sac.

[0012] A simulated right lung air sac is provided, wherein the lower opening of the simulated right lung air sac is connected to the other end of the second air inlet / outlet channel, and a second pressure sensor is connected to the simulated right lung air sac.

[0013] A first linear motor, the bottom of which is fixed to the top of the base, and a first slider on which is fixedly connected to a first bracket, the bottom end of which is fixedly connected to the top of the simulated left lung air sac;

[0014] The second linear motor has its bottom fixed to the top of the base, and a second slider on it is fixedly connected to a second bracket. The bottom end of the second bracket is fixedly connected to the top end of the simulated right lung air sac.

[0015] The first displacement sensor has its bottom end fixed to the top of the base, and its sensing rod end is fixed to the bottom end of the first bracket.

[0016] The second displacement sensor has its bottom end fixed to the top of the base, and its sensing rod end is fixed to the bottom end of the second bracket.

[0017] The controller is mounted on the base and is electrically connected to the first flow sensor, the second flow sensor, the first flow proportional valve, the second flow proportional valve, the first pressure sensor, the second pressure sensor, the first linear motor, the second linear motor, the first displacement sensor, and the second displacement sensor.

[0018] As can be seen from the above technical solution, compared with the prior art, this invention discloses a continuously adjustable active and passive integrated simulated lung device. Two linear motors drive two air bladders to produce periodic expansion and contraction movements, simulating the active and passive intake and exhaust functions of the left and right lungs in the human body. Furthermore, the respiratory rate can be adjusted by regulating the movement frequency of the linear motors. The linear motors, in conjunction with pressure and displacement sensors, can accurately regulate the pressure within the air bladders; a flow proportional valve, in conjunction with a flow sensor, can accurately regulate the airflow into and out of the air bladders. Through the adjustment of pressure and flow, compliance and air resistance can be continuously adjusted, ultimately achieving continuous adjustment of respiratory parameters throughout the entire respiratory process. Therefore, this device can accurately simulate human respiratory function, facilitating the development, testing, efficacy evaluation, and clinical teaching of respiratory-related medical devices.

[0019] Furthermore, both the simulated left lung air sac and the simulated right lung air sac are air sacs.

[0020] The beneficial effects of adopting the above technical solution are: good extensibility, which can achieve smooth expansion and contraction. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 The attached figure is a schematic diagram of the structure of an integrated active and passive simulated lung device with continuously adjustable respiratory parameters provided by the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, this embodiment of the invention discloses an integrated active and passive simulated lung device with continuously adjustable respiratory parameters, comprising:

[0025] The base 1 has a first air inlet / outlet channel and a second air inlet / outlet channel inside. One end of the first air inlet / outlet channel is connected to a first flow sensor 2, and one end of the second air inlet / outlet channel is connected to a second flow sensor 3. Both the first flow sensor 2 and the second flow sensor 3 are connected to an air inlet / outlet pipe 4, which can be connected to the tubing of an external testing breathing device.

[0026] The first flow proportional valve 5 is located at the top of the base 1, and the valve port of the first flow proportional valve 5 is connected to the first inlet and outlet air passage.

[0027] The second flow proportional valve 6 is located at the top of the base 1, and its valve port is connected to the second inlet and outlet air passage.

[0028] The simulated left lung air sac 7 has its lower sac opening connected to the other end of the first air inlet / outlet channel. The simulated left lung air sac 7 is connected to a first pressure sensor 8, which can then measure the gas pressure inside the simulated left lung air sac 7 in real time.

[0029] The simulated right lung air sac 9 has its lower sac opening connected to the other end of the second air inlet / outlet channel. The simulated right lung air sac 9 is connected to a second pressure sensor 10, which can then measure the gas pressure inside the simulated right lung air sac 9 in real time.

[0030] The first linear motor 11 is fixed at the bottom of the base 1, and the first slider 111 on it is fixedly connected to the first bracket 12. The bottom end of the first bracket 12 is fixedly connected to the top end of the simulated left lung air sac 7. Thus, the first slider 111 can drive the first bracket 12 and the simulated left lung air sac 7 to move together during the up and down movement, thereby realizing the extension and retraction of the simulated left lung air sac 7.

[0031] The second linear motor 13 is fixed at the bottom of the base 1, and the second slider 131 on it is fixedly connected to the second bracket 14. The bottom end of the second bracket 14 is fixedly connected to the top end of the simulated right lung air sac 9. Thus, the second slider 131 can drive the second bracket 14 and the simulated right lung air sac 9 to move together during the up and down movement, thereby realizing the extension and retraction of the simulated right lung air sac 9.

[0032] The first displacement sensor 15 is fixed at the bottom of the base 1 and the sensing rod end of the first displacement sensor 15 is fixed at the bottom of the first bracket 12. Thus, as the first bracket 12 moves up and down, the displacement of the simulated left lung air sac 7 can be measured.

[0033] The second displacement sensor 16 is fixed at the bottom of the base 1 and the sensing rod end of the second displacement sensor 16 is fixed at the bottom of the second bracket 14. Thus, as the second bracket 14 moves up and down, the displacement of the simulated right lung air sac 9 can be measured.

[0034] The controller 17 is mounted on the base 1 and is electrically connected to the first flow sensor 2, the second flow sensor 3, the first flow proportional valve 5, the second flow proportional valve 6, the first pressure sensor 8, the second pressure sensor 10, the first linear motor 11, the second linear motor 13, the first displacement sensor 15, and the second displacement sensor 16.

[0035] Among them, the simulated left lung air sac 7 and the simulated right lung air sac 9 are both air sacs.

[0036] The main mechanical parameters of human respiration include compliance and air resistance. Compliance is characterized by the following formula:

[0037]

[0038] C represents respiratory system compliance, measured in ml / cmH2O; V represents the volume of gas entering and leaving the body, measured in ml; and p represents intrapulmonary pressure, measured in cmH2O.

[0039] The air resistance is characterized by the following formula:

[0040]

[0041] R is the air resistance, in cmH2O / (L / s), q is the gas flow rate, in L / s, and Δp is the pressure difference between the inside and outside of the lungs, in cmH2O.

[0042] The volume V can be obtained by integrating the flow rate q, as shown in the following formula.

[0043] V=∫dq (3)

[0044] Active mode:

[0045] In active mode, the active breathing function of the human body is simulated by actively controlling the expansion and contraction of the airbags. The controller sends control commands to the first and second linear motors, which drive the first and second sliders to move up and down, respectively. The first and second sliders further drive the expansion and contraction of the first and second supports, as well as the simulated left and right lung airbags. The expansion and contraction of the airbags causes alternating positive and negative pressure changes inside them, resulting in alternating inflow and outflow of gas in the flow proportional valve, flow sensor, and inlet / outlet tubing. This interacts with the ventilator and other equipment, thereby simulating the active breathing function of the human body.

[0046] In addition, during the inlet and outlet of air, the controller can adjust the motion frequency of the linear motor according to the needs of setting the breathing parameters, thereby adjusting the breathing frequency; the controller can adjust the slider position in real time according to the measurement feedback values ​​of the pressure sensor and displacement sensor, thereby adjusting the volume of the airbag and thus adjusting the gas pressure in the airbag; the controller can adjust the opening of the flow proportional valve in real time according to the measurement feedback value of the flow sensor, thereby adjusting the gas flow rate; according to equations (1), (2), and (3), by adjusting the pressure p and the flow rate q, the adjustment of C, R, and V can be achieved.

[0047] Passive mode:

[0048] In passive mode, the ventilator and other equipment supply air to the cuff through the inlet and outlet tubes. The respiratory rate, inspiratory pressure, and inspiratory volume are all set by the ventilator, and only compliance and air resistance are adjustable. Similar to active mode, the controller adjusts the slider position in real time based on the measurement feedback values ​​of the pressure sensor and displacement sensor, thereby adjusting the gas pressure in the cuff; the controller adjusts the opening of the flow proportional valve in real time based on the measurement feedback value of the flow sensor, thereby adjusting the gas flow rate; finally, according to equations (1) and (2), the C and R are adjusted by adjusting the pressure p and the flow rate q.

[0049] Therefore, in the above embodiments, the linear motor, displacement sensor, and pressure sensor work together to accurately regulate the gas pressure inside the airbag. The flow proportional valve and flow sensor work together to accurately regulate the gas flow rate into and out of the airbag. By adjusting the pressure and flow rate, compliance and air resistance can be continuously adjusted, ultimately achieving continuous adjustability of respiratory parameters throughout the entire breathing process.

[0050] Therefore, the active and passive integrated simulated lung device proposed in this invention can realize active and passive breathing functions; it can also realize continuous adjustment of respiratory parameters and accurately simulate human respiratory function, which is beneficial for the development, testing, effect evaluation and clinical teaching of respiratory-related medical devices.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuously adjustable active-passive integrated simulated lung device, characterized in that, include: The base (1) is provided with a first air inlet / outlet channel and a second air inlet / outlet channel. One end of the first air inlet / outlet channel is connected to a first flow sensor (2), and one end of the second air inlet / outlet channel is connected to a second flow sensor (3). Both the first flow sensor (2) and the second flow sensor (3) are connected to air inlet / outlet pipes (4). The first flow proportional valve (5) is disposed at the top of the base (1), and the valve port of the first flow proportional valve (5) is connected to the first inlet and outlet air passage. The second flow proportional valve (6) is disposed at the top of the base (1), and the valve port of the second flow proportional valve (6) is connected to the second inlet and outlet air passage. A simulated left lung air sac (7) is provided, wherein the lower opening of the simulated left lung air sac (7) is connected to the other end of the first air inlet and outlet channel, and a first pressure sensor (8) is connected to the simulated left lung air sac (7). A simulated right lung air sac (9) is provided, the lower sac opening of which is connected to the other end of the second air inlet / outlet channel, and a second pressure sensor (10) is connected to the simulated right lung air sac (9). The first linear motor (11) is fixed at the bottom of the base (1) and the first slider (111) on it is fixedly connected to the first bracket (12). The bottom end of the first bracket (12) is fixedly connected to the top end of the simulated left lung air sac (7). The second linear motor (13) is fixed at the bottom of the base (1) and the second slider (131) on it is fixedly connected to the second bracket (14). The bottom end of the second bracket (14) is fixedly connected to the top end of the simulated right lung air sac (9). The first displacement sensor (15) is fixed at the bottom of the base (1) and the sensing rod end of the first displacement sensor (15) is fixed at the bottom of the first bracket (12). The second displacement sensor (16) has its bottom end fixed to the top of the base (1), and the sensing rod end of the second displacement sensor (16) is fixed to the bottom end of the second bracket (14). The controller (17) is mounted on the base (1) and is electrically connected to the first flow sensor (2), the second flow sensor (3), the first flow proportional valve (5), the second flow proportional valve (6), the first pressure sensor (8), the second pressure sensor (10), the first linear motor (11), the second linear motor (13), the first displacement sensor (15), and the second displacement sensor (16).

2. The integrated active and passive simulated lung device with continuously adjustable respiratory parameters according to claim 1, characterized in that, Both the simulated left lung air sac (7) and the simulated right lung air sac (9) are air sacs.

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