Air circuit system of cardiopulmonary resuscitation equipment

Abstract

The present invention is an air circuit system of a cardiopulmonary resuscitation device with a simple air circuit and low control difficulty. The pressing unit comprises an outer sleeve whose core is located in a vertical direction and a piston arranged in the inner cavity of the outer sleeve. The piston divides the inner cavity of the outer sleeve into an upper chamber and a lower chamber which are sealed with each other. The lower chamber is communicated with a bag belt arranged inside a chest belt, and the upper chamber is communicated with a gas chamber of a breathing unit. The gas in the gas chamber enters the upper chamber and drives the piston to move downward to drive a pressing head to press the patient's chest. At the same time, the gas in the lower chamber enters the bag belt to wrap the patient's chest. When the gas in the upper chamber returns to the gas chamber, the piston moves upward, the bag belt shrinks, and the chest belt and the pressing head release the patient's chest at the same time. The air circuits of the pressing unit and the breathing unit are integrated into one. The gas in the gas chamber of the breathing unit is used as gas for ventilating the patient on the one hand, and as a power source for driving the pressing unit on the other hand. Therefore, only one set of power units needs to be set, simplifying the air circuit setting.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an air circuit system of a cardiopulmonary resuscitation device. Background Art

[0002] Cardiopulmonary resuscitation can save patients with cardiac arrest. According to the 2015 AHA Cardiopulmonary Resuscitation Guidelines, the guidelines recommend that you perform cardiopulmonary resuscitation (chest compressions and artificial respiration) as soon as possible, and obtain a nearby AED (automatic external defibrillator) to minimize interruptions in compressions; once the AED is obtained, perform an electrocardiogram and defibrillation on the patient as soon as possible. Once cardiac arrest occurs, if it is not promptly rescued and resuscitated, it will cause irreversible damage to the patient's brain and other important organs and tissues of the people in distress after 4 to 6 minutes. Therefore, cardiopulmonary resuscitation after cardiac arrest must be performed immediately on the scene to win the most precious time for further rescue and even saving the lives of the patients with cardiac arrest.

[0003] At present, there are corresponding emergency equipment for sudden cardiac arrest on the market, but most of them work independently, such as cardiopulmonary resuscitation machines, AED defibrillators, ventilators, monitors, etc. When used together, it is difficult for the devices to work together, and the operation of the equipment is still too cumbersome. The quality of cardiopulmonary resuscitation is not high, and the success rate of treatment is almost the same as that of manual compression. Therefore, the industry is exploring integrated products that can integrate compression, ventilation, defibrillation, and monitoring functions. In this type of integrated product, the compression action of cardiopulmonary resuscitation requires a set of power mechanisms to drive it, and the breathing assistance of the ventilator also requires a set of power to drive it. How to optimize the gas path, reduce the size of the integrated product, and reduce the difficulty of control and operation under the premise of integration is a major problem in the industry. Summary of the invention

[0004] The object of the present invention is to provide an air circuit system for cardiopulmonary resuscitation equipment with a simple air circuit and low control difficulty.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an air circuit system of a cardiopulmonary resuscitation device, a back plate and a chest strap are arranged at the bottom of the frame, a pressing unit and a breathing unit are arranged at the top of the frame, the pressing unit includes an outer sleeve whose core is located in the vertical direction and a piston arranged in the inner cavity of the outer sleeve, the piston divides the inner cavity of the outer sleeve into an upper chamber and a lower chamber that are sealed to each other, the lower chamber is communicated with a bag strap arranged inside the chest strap, the upper chamber is communicated with the gas chamber of the breathing unit, the lower end of the piston is connected to the pressing head through a pressure rod, the gas in the gas chamber enters the upper chamber and drives the piston to move downward to drive the pressing head to press the patient's chest, while the gas in the lower chamber enters the bag strap to wrap the patient's chest; when the gas in the upper chamber returns to the gas chamber, the piston moves upward, the gas in the bag strap returns to the lower chamber, and the chest strap and the pressing head release the patient's chest at the same time.

[0006] A through hole is provided at the bottom of the outer sleeve for the pressure rod to pass through, and the through hole is sealed with the outer wall of the pressure rod. A return spring is provided on the outer periphery of the pressure rod located in the lower chamber. The upper end of the return spring abuts against the end face of the piston, and the lower end abuts against the bottom of the outer sleeve. The return spring provides elastic force to drive the piston to move upward, and a buffer pad is also provided at the bottom of the outer sleeve.

[0007] The breathing unit includes a mixed gas chamber storing an air-oxygen mixed gas, the mixed gas chamber is connected to the upper chamber and the mask at the same time, a two-way pumping element is arranged between the mixed gas chamber and the upper chamber, an inhalation valve is arranged on the air supply pipe between the mixed gas chamber and the mask, the inhalation valve is a one-way valve, the conduction direction of the one-way valve is from the mixed gas chamber to the mask, and the air-oxygen mixed gas in the mixed gas chamber is controlled to be on and off with the mask. The breathing unit also includes a gas compensation mechanism, the gas compensation mechanism includes a compensation pipe, the two ends of the compensation pipe are respectively connected to the air supply pipes on both sides of the inhalation valve, and a micro-hole mechanism is arranged on the compensation pipe, and the micro-hole mechanism allows trace gas to flow continuously from the mixed gas chamber to the downstream air supply pipe.

[0008] The breathing unit includes an air-oxygen mixer that stores air. The upper chamber is connected to the air chamber of the air-oxygen mixer. A part of the air in the air chamber enters the upper chamber as a driving force, and the other part enters the mixing chamber of the air-oxygen mixer. An inhalation valve is provided on the air supply pipe between the mixing chamber and the mask. The inhalation valve is a one-way valve. The conduction direction of the one-way valve is from the mixing chamber to the mask, and controls the connection and disconnection of the air-oxygen mixed gas in the mixing chamber and the mask. The breathing unit also includes a gas compensation mechanism, which includes a compensation pipe. The two ends of the compensation pipe are respectively connected to the air supply pipes on both sides of the inhalation valve. The compensation pipe is provided with a micro-hole mechanism. The micro-hole mechanism allows trace gas to flow continuously from the mixing chamber to the downstream air supply pipe.

[0009] The micro-flow mechanism continuously supplies trace amounts of gas to the downstream air supply tube throughout the entire cardiopulmonary resuscitation phase.

[0010] An exhaust pipe is connected to the air supply pipe near the mask, and an exhaust valve is provided on the exhaust pipe. When breathing, the mixed gas flowing in from the compensation tube and the exhaled gas discharged from the mask are discharged to the external environment through the exhaust pipe.

[0011] The chest strap comprises a strap, a bag strap is arranged inside the strap, and a plurality of defibrillation electrodes and ECG electrodes are arranged on the inner surface of the strap. When the gas in the lower chamber enters the bag strap and wraps the patient's chest, the bag strap presses the defibrillation electrodes and ECG electrodes tightly against the patient's skin.

[0012] The upper plate surface of the back plate is in a groove shape adapted to the human body. The control unit is arranged on the back plate. The control unit includes a PCB board, an operation panel, and a display.

[0013] The frame includes a base plate, a column, and a top frame. Universal wheels are provided at the corners of the base plate, and a cross slide rail is provided on the top frame. The driving unit drives the pressing unit and the breathing unit to move on the cross slide rail to just above the chest belt. The column is a multi-section telescopic rod structure, and a slide rail is also provided on the top section of the rod. The length direction of the slide rail is in the vertical direction.

[0014] The above scheme has at least the following beneficial effects:

[0015] 1. The compression, ventilation, defibrillation and monitoring functions are integrated into an integrated structure, and the different functions work together, which greatly improves the efficiency of the equipment and the convenience of operation.

[0016] 2. The air circuits of the pressing unit and the breathing unit are integrated into one. The gas in the gas cavity of the breathing unit is used as a raw material for ventilating the patient on the one hand, and as a power source for driving the pressing unit on the other hand. Therefore, only one power unit is needed to simplify the air circuit setting and reduce the control difficulty.

[0017] 3. A compensating gas circuit is set up in the breathing system to compensate for gas leakage in the entire system, maintain the stability of air pressure, and ensure the effectiveness of assisted breathing.

[0018] 4. The micro-pore mechanism in the compensation gas path has a continuous trace amount of gas flowing downstream, so it can provide a constant PEEP (positive end-expiratory pressure), simulating the normal glottis closure state at the end of expiration to maintain functional residual capacity and prevent alveolar collapse.

[0019] 5. Combining forward and backward compression with circular contraction, the compression unit inflates the cuff while compressing the patient's chest. The cuff tightly wraps the patient's chest, thereby providing higher intrathoracic pressure changes, greater blood flow and a higher rate of spontaneous circulation recovery.

[0020] 6. The inflation and deflation of the bag belt does not require the setting of an additional inflation and deflation mechanism and control unit. It is linked and synchronized with the action of the pressing head, reducing the complexity of the control system.

[0021] 7. The control unit can adjust the position of the pressing head in real time according to the real-time position signal sent by the position sensor, thereby ensuring that the pressing head is always located directly above the positioning block, always ensuring the correct pressing position, and thus ensuring the effect of cardiopulmonary resuscitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the gas circuit system of the cardiopulmonary resuscitation equipment during the non-compression period;

[0023] Figure 2 It is a schematic diagram of the overall structure of the gas circuit system of the cardiopulmonary resuscitation equipment during the compression period;

[0024] Figure 3 is a schematic diagram of the air circuit system in Example 1 during the pressing period;

[0025] Figure 4 is a schematic diagram of the gas circuit system in Example 1 during the inhalation period;

[0026] Figure 5 Schematic diagram of the airway system in Example 1 during the breathing period;

[0027] Figure 6 is a schematic diagram of the air circuit system in Example 2 during the pressing period;

[0028] Figure 7 is a schematic diagram of the gas circuit system in Example 2 during the inhalation period;

[0029] Figure 8 This is a schematic diagram of the airway system in Example 2 during the breathing period. DETAILED DESCRIPTION

[0030] Combine the following Figure 1-Figure 8 The present invention is described in further detail.

[0031] like Figure 1 , Figure 2As shown, an air circuit system of a cardiopulmonary resuscitation device, a back plate 20 and a chest strap 30 are arranged at the bottom of a frame 10, a pressing unit 40 and a breathing unit 50 are arranged at the top of the frame 10, the pressing unit 40 includes an outer sleeve 41 whose core is located in the vertical direction and a piston 42 arranged in the inner cavity of the outer sleeve 41, the piston 42 divides the inner cavity of the outer sleeve 41 into an upper chamber A and a lower chamber B that are sealed from each other, the lower chamber B is communicated with the bag belt 31 arranged inside the chest strap 30, and the upper chamber A is connected to the gas chamber of the breathing unit 50, and the lower end of the piston 42 is connected to the pressing head 44 through the pressure rod 43. The gas in the gas chamber enters the upper chamber A and drives the piston 42 to move downward to drive the pressing head 44 to press the patient's chest. At the same time, the gas in the lower chamber B enters the bag belt 31 to wrap the patient's chest; when the gas in the upper chamber A returns to the gas chamber, the piston 42 moves upward, and the gas in the bag belt 31 returns to the lower chamber B, and the chest belt 30 and the pressing head 44 release the patient's chest at the same time.

[0032] In the above scheme, the gas in the gas cavity of the breathing unit 50 is used as a raw material for ventilating the patient on the one hand, and as a power source for driving the pressing unit 40 on the other hand. Therefore, only one set of power units is required to simplify the gas circuit setting.

[0033] The lower chamber B of the outer sleeve 41 is originally filled with gas. When the gas in the gas chamber enters the upper chamber A and drives the piston 42 to move downward, the pressing head 44 presses the chest to perform cardiopulmonary resuscitation. At the same time, the volume of the lower chamber B decreases, and the gas in the lower chamber B enters the bag belt 31 to inflate the bag belt 31, and the chest belt 30 tightens and compresses the chest. Figure 1 When the upper chamber A returns to the gas chamber, the piston 42 moves upward, and the pressing head 44 leaves the patient's chest. At this time, the volume of the lower chamber B increases to generate negative pressure, and the gas in the bag belt 31 returns to the lower chamber B. The bag belt 31 deflates and shrinks, releasing the restraint on the patient's chest. Figure 2 That is to say, the expansion action of the bag belt 31 is synchronized with the pressing action of the pressing head 44. When the pressing head 44 drops to the lowest point, the wrapping force of the bag belt 31 is also the largest, so it can increase the intrathoracic pressure difference of the patient and enhance the effect of cardiopulmonary resuscitation. Moreover, the inflation and deflation of the bag belt 31 does not require the setting of an additional inflation and deflation mechanism and control unit. It is linked and synchronized with the action of the pressing head 44, reducing the complexity of the control system.

[0034] The upper chamber A and the lower chamber B are sealed with each other. When the lower chamber B is filled with gas, the amount of gas is determined, and the corresponding relationship between the downward distance of the piston 42 and the pressure of the bag belt 31 on the patient's chest when the bag belt 31 is filled with gas is determined, thereby ensuring the effect of cardiopulmonary resuscitation.

[0035] Specifically, the bottom of the outer sleeve 41 is provided with a through hole for the pressure rod 43 to pass through, and the through hole and the outer wall of the pressure rod 43 are sealed to prevent gas leakage and affect the effect of cardiopulmonary resuscitation. The outer periphery of the pressure rod 43 located in the lower chamber B is sleeved with a return spring 45, the upper end of the return spring 45 is against the end face of the piston 42, and the lower end is against the bottom of the outer sleeve 41. The return spring 45 provides elastic force to drive the piston 42 to move upward. When the gas in the upper chamber A is discharged, the elastic force of the return spring 45 ensures that the piston 42 can be quickly reset, thereby improving the effectiveness of cardiopulmonary resuscitation. The bottom of the outer sleeve 41 is also provided with a buffer pad, which can reduce the impact noise between the pressing head 44 and the bottom of the outer sleeve 41 when the pressing head 44 is reset, and also protect the structures of both from damage. Example 1

[0036] See also Figure 3-Figure 5 As shown, the breathing unit 50 includes a mixed gas chamber 51 storing air-oxygen mixed gas, the mixed gas chamber 51 is connected to the upper chamber A and the mask 53 at the same time, a two-way pumping element is arranged between the mixed gas chamber 51 and the upper chamber A, and an inhalation valve 54 is arranged on the air supply pipe 52 between the mixed gas chamber 51 and the mask 53. The inhalation valve 54 is a one-way valve, and the conduction direction of the one-way valve is from the mixed gas chamber 51 to the mask 53, and controls the connection and disconnection of the air-oxygen mixed gas in the mixed gas chamber 51 and the mask 53. In this embodiment, it is not necessary to set up an air compressor and an air-oxygen mixer, but directly use the mixed gas chamber 51 that has stored the mixed gas after the air and oxygen are mixed. Here, the mixed gas chamber 51 can be a container similar to a gas storage tank. The mixed gas can be directly used as the patient's breathing gas, and can also be used as the driving gas for driving the pressing unit 40. In order to improve the utilization efficiency of the mixed gas, the mixed gas chamber 51 and the pressing unit 40 realize the recycling of gas through a two-way pump unit. Here, in order to ensure the stability of the gas pressure in the mixed gas chamber 51, it may be necessary to regularly replenish the mixed gas chamber 51. However, the control of the gas circuit by the entire device is relatively simple, and the same mixed gas chamber 51 can be used in conjunction with different cardiopulmonary resuscitation devices. Example 2

[0037] See also Figure 6-Figure 8 As shown, the breathing unit 50 includes an air-oxygen mixer 56, the upper chamber A is connected to the air cavity 561 of the air-oxygen mixer 56, a part of the air in the air cavity 561 enters the upper chamber A as a driving force, and the other part enters the mixing cavity 562 of the air-oxygen mixer 56. In this embodiment, the power used to drive the pressing unit 40 is air. In order to save an air compressor, the upper chamber A is connected to the air cavity 561 of the air-oxygen mixer 56, thereby realizing the dual role of the air cavity 561. When it is necessary to supply air to the patient, air is supplied to the oxygen cavity of the air-oxygen mixer 56.

[0038] In both Example 1 and Example 2, the pressing unit 40 is driven by pneumatic means. Compared with the electric driving means, the pneumatic means does not require complicated electrical components and control systems, and can be integrated with the air circuit of the breathing unit 50, thereby reducing costs.

[0039] In the entire breathing unit 50, there are many components, and various valve components, trachea, masks and tube connectors will inevitably have a small amount of gas leakage, resulting in insufficient or unstable end-expiratory positive pressure. Therefore, the breathing unit 50 also includes a gas compensation mechanism, which includes a compensation tube 55. The two ends of the compensation tube 55 are respectively connected to the air supply tube 52 on both sides of the inhalation valve 54. The compensation tube 55 is provided with a micro-hole mechanism 551. The micro-hole mechanism 551 allows a trace amount of gas to flow continuously from the mixed gas chamber 51 / mixing chamber 562 to the downstream air supply pipe 52. In the inhalation stage, the inhalation valve 54 is opened and the exhalation valve is closed. A large part of the mixed gas from the mixed gas chamber 51 / mixing chamber 562 flows through the inhalation valve 54 to the downstream air supply pipe 52, and a small part of the mixed gas flows through the micro-holes of the compensation tube 55 to the downstream air supply pipe 52. These two mixed gases are mixed in the air supply pipe 52 and enter the mask together for the patient to inhale, so as to maintain the stability of ventilation pressure and tidal volume. During the exhalation stage, the inhalation valve 54 is closed and the exhalation valve is opened. The mixed gas cannot flow through the inhalation valve 54 to the downstream air supply pipe 52, but a small part of the mixed gas still passes through the micro-holes of the compensation tube 55 and flows downstream. This part of the gas enters and is discharged into the external environment together with the exhaled air flow flowing out of the patient.

[0040] It should be noted that the setting of the micro-pore mechanism 551 has another function. Normal people also maintain a certain positive pressure at the end of exhalation due to the closure of the glottis, which is called physiological PEEP (positive end-expiratory pressure), generally between 1-3 cm of water column, mainly to maintain functional residual capacity and prevent alveolar collapse. The micro-pore mechanism 551 has a continuous trace gas flowing downstream, so it can provide a constant PEEP (positive end-expiratory pressure). Therefore, the micro-pore mechanism 551 continuously flows to the downstream air supply pipe 52 to provide a trace amount of gas during the entire cardiopulmonary resuscitation stage. The entire cardiopulmonary resuscitation stage here includes both the compression stage and the ventilation stage, so that the physiological PEEP (positive end-expiratory pressure) can be guaranteed.

[0041] Furthermore, an exhaust pipe 57 is connected to the air supply pipe 52 near the mask 53, and an exhaust valve 571 is provided on the exhaust pipe 57. During exhalation, the mixed gas flowing in from the compensation pipe 55 and the exhaled gas discharged from the mask 53 are discharged to the external environment through the exhaust pipe 57, and the exhaust valve 571 is closed during the inhalation stage.

[0042] During the cardiopulmonary resuscitation stage, compressions and ventilations are usually performed alternately at different time periods. Generally speaking, the ratio of compressions to ventilations is usually 30:2, that is, 30 compressions followed by 2 ventilations.

[0043] Figure 3 This is a schematic diagram of the gas circuit system in Example 1 during the pressing period. Gas circulation is achieved between the mixed gas chamber 51 and the upper chamber A through a two-way pump mechanism. At this time, a small amount of mixed gas will still pass through the micro-pore mechanism 551 to maintain physiological PEEP.

[0044] Figure 4 This is a schematic diagram of the air circuit system in Example 1 during the inhalation period. At this time, the inhalation valve 54 is opened, and a large part of the mixed gas in the mixed gas chamber 51 flows to the downstream air supply pipe 52 through the inhalation valve 54. In addition, a small part of the mixed gas flows to the downstream air supply pipe 52 through the micro-flow holes of the compensation pipe 55. These two mixed gases are mixed in the air supply pipe 52 and then enter the mask together for the patient to inhale, so as to maintain the stability of the ventilation pressure and tidal volume.

[0045] Figure 5 This is a schematic diagram of the air circuit system in Example 1 during the breathing period. At this time, the inhalation valve 54 is closed and the exhalation valve is opened. The mixed gas cannot flow through the inhalation valve 54 to the downstream air supply pipe 52, but a small part of the mixed gas still passes through the micro-pore mechanism 551 of the compensation tube 55 and flows downstream. This part of the gas enters and is discharged into the external environment together with the exhaled air flow flowing out of the patient.

[0046] Figure 6 This is a schematic diagram of the air circuit system in Example 2 during the pressing period. At this time, oxygen and air are supplied to the air-oxygen mixer 56 at a certain ratio. An air compressor is used to supply air to the air cavity 561 of the air-oxygen mixer 56. Most of the air directly enters the upper chamber A to drive the piston 42 to move downward. Only a small amount of air enters the mixing chamber 562 through the proportional valve. At this time, a small amount of mixed gas will still pass through the micro-pore mechanism 551 to maintain physiological PEEP.

[0047] Figure 7 This is a schematic diagram of the air circuit system in Example 2 during the inhalation period. The passage between the air cavity 561 and the upper chamber A is disconnected, and oxygen and air are supplied to the air-oxygen mixer 56 in a certain proportion. A mixed gas is formed in the mixing cavity 562. The inhalation valve 54 is opened, and a large part of the mixed gas in the mixing cavity 562 flows through the inhalation valve 54 to the downstream air supply pipe 52. In addition, a small part of the mixed gas flows through the micro-flow holes of the compensation tube 55 to the downstream air supply pipe 52. The two mixed gases are mixed in the air supply pipe 52 and then enter the mask together for the patient to inhale, so as to maintain the stability of the ventilation pressure and tidal volume.

[0048] Figure 8 This is a schematic diagram of the air circuit system in Example 2 during the breathing period. At this time, the inhalation valve 54 is closed and the exhalation valve is opened. The mixed gas cannot flow through the inhalation valve 54 to the downstream air supply pipe 52, but a small part of the mixed gas still passes through the micro-flow holes of the compensation tube 55 and flows downstream. This part of the gas enters and is discharged into the external environment together with the exhaled air flow flowing out of the patient.

[0049] Furthermore, the chest strap 30 includes a strap 32, a bag strap 31 is arranged inside the strap 32, and a plurality of defibrillation electrodes 60 and ECG electrodes 70 are arranged on the inner surface of the strap 32. When the gas in the lower chamber B enters the bag strap 31 and wraps the patient's chest, the bag strap 31 presses the defibrillation electrodes 60 and ECG electrodes 70 tightly against the patient's skin. The bag strap 31 is arranged inside the chest strap 30, and the front and rear pressing and circumferential contraction are combined together, that is, the pressing unit 40 inflates the bag strap 31 while pressing the patient's chest, and the bag strap 31 tightly wraps the patient's chest, thereby providing a higher intrathoracic pressure change, a larger blood flow and a higher spontaneous circulation recovery rate. At the same time, the structure of the bag strap 31 inside the chest strap 30 also has a significant beneficial effect, that is, after adjusting the tightness of the chest strap 30, during the entire process of subsequent cardiopulmonary resuscitation, it is not necessary to adjust the tightness of the chest strap again, but the chest is tightened and compressed and the pressure is released by inflating and deflating the bag strap 31. While the pressing unit 40 is pressing the chest, the bag belt 31 is inflated, and the chest is tightened and compressed synchronously with the pressing of the pressing unit 40; when the pressing operation is removed, the bag belt 31 is deflated, and the chest is no longer subject to any restraint, which increases the change in intrathoracic pressure and improves the effect of cardiopulmonary resuscitation.

[0050] In the prior art, due to technical limitations, the defibrillation operation and the pressing operation are not synchronized. This is because when manual pressing is adopted, in order to prevent the operator from electric shock, the defibrillation operation can only be performed during the non-pressing period. However, studies have shown that in the stage of pressing the chest and exhaling, the chest impedance is low, and the effect of applying defibrillation shock at this time is the best and the success rate is the highest. Therefore, another key point of the present invention is to set the defibrillation electrode 60 and the ECG electrode 70 on the inner surface of the chest strap 30. When pressing the chest, the chest strap 30 tightly wraps the chest, and the defibrillation electrode 60 fits tightly with the skin without relative sliding. The defibrillation electrode 60 applies the defibrillation operation to improve the success rate of defibrillation. In addition, the ECG electrode monitors the patient's electrocardiogram signal in real time, and the breathing unit 50 ventilates the patient at an appropriate time.

[0051] The present invention integrates the functions of compression, ventilation, defibrillation and monitoring into an integrated structure, and the different functions work together, which greatly improves the efficiency of the equipment and the convenience of operation.

[0052] The upper surface of the back panel 20 is in a groove shape that adapts to the human body. The groove includes an area that matches the back of the human body, an area that supports the head and back at an appropriate angle, and an area that supports the neck. The control unit 80 is arranged on the back panel 20 for easy operation and observation. The control unit 80 includes a PCB board, an operation panel, and a display.

[0053] Furthermore, the frame 10 includes a base plate 11, a column 12, and a top frame 13. Universal wheels 14 are provided at the corners of the base plate 11, and a cross slide rail is provided on the top frame 13. The driving unit drives the pressing unit 40 and the breathing unit 50 to move on the cross slide rail to just above the chest belt 30. The column 12 is a multi-section telescopic rod structure, and a slide rail is also provided on the top section of the rod, and the length direction of the slide rail is in the vertical direction. The cross slide rail is composed of two sets of mutually perpendicular slide rails, which can realize precise positioning and movement in a two-dimensional plane. Therefore, with the assistance of the position sensor, the pressing unit 40 can be accurately moved in the horizontal plane to just above the correct pressing position; the column 12 is a multi-section telescopic rod structure, which can be used in various scenarios such as ambulances, on the ground and by the bed; a vertical slide rail is arranged on the top section of the column 12, and the top frame 13 can move up and down along the slide rail to adjust the distance between the pressing unit 40 and the bottom plate 11; a universal wheel 14 is also provided at the foot position of the bottom plate 11 to facilitate the movement of the entire device.

[0054] When performing cardiopulmonary resuscitation for patients of different body types, the pressing depth is not the same, and the pressing depth is one of the key factors to ensure the effectiveness of cardiopulmonary resuscitation. For the pressing depth, generally speaking, it is 5-6cm for adults, 2-5cm for children, 2-4cm for infants, and more than 5cm for the elderly. It can be seen that when performing cardiopulmonary resuscitation for patients of different types and body types, the pressing depth needs to be determined according to the specific conditions of the patients. In the present invention, in addition to considering the length of the chest strap 30 and the position of the defibrillation electrode 60, it is also necessary to consider the problem of the inflation amount of the bag belt 31. If more gas needs to be filled into the bag belt 31, it means that the displacement of the piston 42 is larger. Under the same pressing depth, the initial distance between the pressing unit 40 and the patient's chest should be set larger, that is, the height of the top frame 13 needs to be adjusted upward; if less gas needs to be filled into the bag belt 31, it means that the displacement of the piston 42 is smaller. Under the same pressing depth, the initial distance between the pressing unit 40 and the patient's chest should be set smaller, that is, the height of the top frame 13 needs to be adjusted downward. Therefore, it is necessary to reasonably control multiple factors to ensure the effectiveness of cardiopulmonary resuscitation.

[0055] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the schemes or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A gas circuit system for a cardiopulmonary resuscitation device, characterized in that: A back plate (20) and a chest strap (30) are arranged at the bottom of the frame (10), and a pressing unit (40) and a breathing unit (50) are arranged at the top of the frame (10). The pressing unit (40) comprises an outer sleeve (41) whose core is located in a vertical direction and a piston (42) arranged in the inner cavity of the outer sleeve (41). The piston (42) divides the inner cavity of the outer sleeve (41) into an upper chamber (A) and a lower chamber (B) which are sealed from each other. The lower chamber (B) is communicated with the bag belt (31) arranged inside the chest strap (30), and the upper chamber (A) is connected to the breathing unit (50). The gas chambers of the element (50) are in communication, and the lower end of the piston (42) is connected to the pressing head (44) via a pressing rod (43). The gas in the gas chamber enters the upper chamber (A) and drives the piston (42) to move downward, driving the pressing head (44) to press the patient's chest. At the same time, the gas in the lower chamber (B) enters the bag belt (31) to wrap around the patient's chest. When the gas in the upper chamber (A) returns to the gas chamber, the piston (42) moves upward, and the gas in the bag belt (31) returns to the lower chamber (B). The chest belt (30) and the pressing head (44) release the patient's chest at the same time. A through hole is provided at the bottom of the outer sleeve (41) for the pressure rod (43) to pass through, and the through hole is sealed with the outer wall of the pressure rod (43). A return spring (45) is sleeved on the outer periphery of the pressure rod (43) in the lower chamber (B). The upper end of the return spring (45) abuts against the end surface of the piston (42), and the lower end abuts against the bottom of the outer sleeve (41). The return spring (45) provides elastic force to drive the piston (42) to move upward. A buffer pad is also provided at the bottom of the outer sleeve (41); The breathing unit (50) comprises a mixed gas chamber (51) storing an air-oxygen mixed gas, the mixed gas chamber (51) being connected to both the upper chamber (A) and the mask (53), a two-way pumping element being provided between the mixed gas chamber (51) and the upper chamber (A), an inhalation valve (54) being provided on the air supply pipe (52) between the mixed gas chamber (51) and the mask (53), the inhalation valve (54) being a one-way valve, the conduction direction of the one-way valve being from the mixed gas chamber (51) to the mask (53), and controlling the on-off of the air-oxygen mixed gas in the mixed gas chamber (51) and the mask (53); The breathing unit (50) further comprises a gas compensation mechanism, the gas compensation mechanism comprising a compensation tube (55), the two ends of the compensation tube (55) being respectively connected to the gas supply tubes (52) on both sides of the inhalation valve (54), and a micro-hole mechanism (551) being provided on the compensation tube (55), the micro-hole mechanism (551) allowing a trace amount of gas to flow continuously from the mixed gas chamber (51) to the downstream gas supply tube (52).

2. A gas circuit system for a cardiopulmonary resuscitation device, characterized in that: A back plate (20) and a chest strap (30) are arranged at the bottom of the frame (10), and a pressing unit (40) and a breathing unit (50) are arranged at the top of the frame (10). The pressing unit (40) comprises an outer sleeve (41) whose core is located in a vertical direction and a piston (42) arranged in the inner cavity of the outer sleeve (41). The piston (42) divides the inner cavity of the outer sleeve (41) into an upper chamber (A) and a lower chamber (B) which are sealed from each other. The lower chamber (B) is communicated with the bag belt (31) arranged inside the chest strap (30), and the upper chamber (A) is connected to the breathing unit (50). The gas chambers of the element (50) are in communication, and the lower end of the piston (42) is connected to the pressing head (44) via a pressing rod (43). The gas in the gas chamber enters the upper chamber (A) and drives the piston (42) to move downward, driving the pressing head (44) to press the patient's chest. At the same time, the gas in the lower chamber (B) enters the bag belt (31) to wrap around the patient's chest. When the gas in the upper chamber (A) returns to the gas chamber, the piston (42) moves upward, and the gas in the bag belt (31) returns to the lower chamber (B). The chest belt (30) and the pressing head (44) release the patient's chest at the same time. A through hole is provided at the bottom of the outer sleeve (41) for the pressure rod (43) to pass through, and the through hole is sealed with the outer wall of the pressure rod (43). A return spring (45) is sleeved on the outer periphery of the pressure rod (43) in the lower chamber (B). The upper end of the return spring (45) abuts against the end surface of the piston (42), and the lower end abuts against the bottom of the outer sleeve (41). The return spring (45) provides elastic force to drive the piston (42) to move upward. A buffer pad is also provided at the bottom of the outer sleeve (41); The breathing unit (50) comprises an air-oxygen mixer (56) for storing air. The upper chamber (A) is in communication with an air chamber (561) of the air-oxygen mixer (56). A portion of the air in the air chamber (561) enters the upper chamber (A) as a driving force, and another portion enters a mixing chamber (562) of the air-oxygen mixer (56). An air intake valve (54) is provided on the air supply pipe (52) between the mixing chamber (562) and the mask (53). The air intake valve (54) is a one-way valve. The one-way valve is turned on in a direction from the mixing chamber (562) to the mask (53), so as to control the connection and disconnection between the air-oxygen mixed gas in the mixing chamber (562) and the mask (53). The breathing unit (50) further comprises a gas compensation mechanism, the gas compensation mechanism comprising a compensation tube (55), the two ends of the compensation tube (55) being respectively connected to the gas supply tube (52) on both sides of the inhalation valve (54), and a micro-flow hole mechanism (551) being provided on the compensation tube (55), the micro-flow hole mechanism (551) allowing a trace amount of gas to flow continuously from the mixing chamber (562) to the downstream gas supply tube (52).

3. The gas circuit system of the cardiopulmonary resuscitation device according to claim 1 or 2, characterized in that: The micro-flow hole mechanism (551) continuously flows to the downstream gas supply pipe (52) to provide a trace amount of gas during both the pressing period and the ventilation period.

4. The gas circuit system of the cardiopulmonary resuscitation device according to claim 1 or 2, characterized in that: An exhaust pipe (57) is connected to the air supply pipe (52) adjacent to the mask (53), and an exhaust valve (571) is provided on the exhaust pipe (57). During breathing, the mixed gas flowing in from the compensation pipe (55) and the exhaled gas discharged from the mask (53) are discharged from the exhaust pipe (57) to the external environment.

5. The gas circuit system of the cardiopulmonary resuscitation device according to claim 1 or 2, characterized in that: The chest strap (30) comprises a strap (32), a bag strap (31) is arranged inside the strap (32), and a plurality of defibrillation electrodes (60) and ECG electrodes (70) are arranged on the inner surface of the strap (32); when the gas in the lower chamber (B) enters the bag strap (31) and wraps around the patient's chest, the bag strap (31) presses the defibrillation electrodes (60) and the ECG electrodes (70) tightly against the patient's skin.

6. The gas circuit system of the cardiopulmonary resuscitation device according to claim 1 or 2, characterized in that: The upper surface of the back panel (20) is in a groove shape adapted to the human body. The control unit (80) is arranged on the back panel (20). The control unit (80) comprises a PCB board, an operation panel, and a display.

7. The gas circuit system of the cardiopulmonary resuscitation device according to claim 1 or 2, characterized in that: The frame (10) comprises a bottom plate (11), a column (12), and a top frame (13); a universal wheel (14) is arranged at a corner of the bottom plate (11); a cross slide rail is arranged on the top frame (13); a driving unit drives the pressing unit (40) and the breathing unit (50) to move on the cross slide rail to the top of the chest belt (30); the column (12) is a multi-section telescopic rod structure; a slide rail is also arranged on the top section of the rod; and the length direction of the slide rail is in the vertical direction.

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