A pneumatic cardiopulmonary resuscitation pressing device

Abstract

The present invention discloses a pneumatic cardiopulmonary resuscitation pressing device, which comprises a cylinder and a buffer chamber, and the buffer chamber is arranged close to the cylinder; a piston is arranged in the cylinder, the ejecting end of the piston is connected with a pressing head, the air inlet of the cylinder is connected with the air supply port of a control valve, and the air inlet of the control valve is connected with an air source through an air inlet pipe; a bronchus is arranged at one end of the air inlet pipe close to the control valve, and the bronchus conducts the air inlet pipe and the buffer chamber. The pneumatic cardiopulmonary resuscitation pressing device of the present invention not only solves the technical problem of insufficient inflation in the cylinder caused by tracheal air resistance or flow limitation that has long troubled pneumatic pressors, but also improves the clinical application environment of pneumatic pressors, so that the clinical effect of the pressor can be guaranteed under different air sources.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a pneumatic cardiopulmonary resuscitation pressing device. Background Art

[0002] Cardiopulmonary resuscitation pressing devices are one of the most commonly used and important devices in medical first aid. Currently, the pressing devices are basically pneumatic-based. The clinical effects of pneumatic presses are generally recognized, and they are the first choice for in-hospital first aid.

[0003] Currently, there is a common problem with current pneumatic presses that has never been effectively solved. That is, due to the air resistance in the trachea connecting the cylinder and the air source, or due to the flow rate limitation of the air source, the movement of the piston in the cylinder becomes slower, and even the specified pressing depth cannot be achieved at the specified pressing frequency, thus seriously affecting the clinical first aid effect. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the existing pneumatic cardiopulmonary resuscitation pressing device, and further provide a pneumatic cardiopulmonary resuscitation pressing device that can eliminate the influence of tracheal air resistance or air source flow rate limitation on the pressing depth of the piston.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A pneumatic cardiopulmonary resuscitation pressing device includes a cylinder and a buffer chamber, the buffer chamber is disposed close to the cylinder; a piston is disposed in the cylinder, the ejecting end of the piston is connected to a pressing head, the air inlet of the cylinder is connected to the air supply port of a control valve, the air inlet of the control valve is connected to an air source through an air inlet pipe, and the control valve is adapted to guide the gas in the air source into the cylinder to drive the piston to eject downward, or to discharge the gas in the cylinder outward so that the piston rebounds and resets; a bronchus is disposed at one end of the air inlet pipe close to the control valve, and the bronchus conducts the air inlet pipe and the buffer chamber.

[0007] Preferably, the buffer chamber is disposed attached to the outer wall of the cylinder, and the bronchus is connected to the buffer chamber at a position close to the air inlet of the control valve.

[0008] Preferably, the volume of the buffer chamber is greater than or equal to 3 times the volume of the cylinder.

[0009] Preferably, a cylinder body is sleeved outside the cylinder, the cylinder body is coaxially disposed with the cylinder, both ends of the cylinder body are closed, and the space between the inner side of the cylinder body and the outer side of the cylinder forms the buffer chamber.

[0010] Preferably, both ends of the buffer chamber are flush with both ends of the cylinder.

[0011] Preferably, a valve plate is provided at the upper end surfaces of the buffer chamber and the cylinder, and the control valve is installed on the valve plate.

[0012] Preferably, the control valve is a pneumatic control valve or an electric control valve.

[0013] Preferably, the control valve is controlled by a controller to perform opening and closing actions.

[0014] Advantages of the present invention:

[0015] The pneumatic cardiopulmonary resuscitation pressing device of the present invention not only solves the technical problem of insufficient inflation in the cylinder caused by tracheal air resistance or flow limitation that has long troubled pneumatic presses, but also improves the clinical application environment of pneumatic presses, ensuring the clinical effect of the press under different gas sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below with reference to the drawings, wherein:

[0017] Figure 1 is a vertical half-sectional structural schematic diagram of the cylinder of the pneumatic cardiopulmonary resuscitation pressing device of the present invention;

[0018] Figure 2 is a horizontal projection structural schematic diagram of the cylinder and the buffer chamber of the pneumatic cardiopulmonary resuscitation pressing device of the present invention.

[0019] The reference numerals in the drawings are represented as:

[0020] 1 - cylinder; 2 - buffer chamber; 3 - piston; 4 - pressing head; 5 - control valve; 51 - air supply port; 52 - intake port; 53 - exhaust port; 6 - intake pipe; 7 - gas source; 8 - bronchus; 9 - cylinder body; 10 - controller; 11 - valve plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] See Figure 1-2, a pneumatic cardiopulmonary resuscitation pressing device, which comprises a cylinder 1 and a buffer chamber 2, and the buffer chamber 2 is arranged close to the cylinder 1; a piston 3 is arranged in the cylinder 1, and the ejecting end of the piston 3 is connected with a pressing head 4, and the pressing head 4 moves up and down with the piston to perform cardiopulmonary resuscitation pressing actions. The air inlet of the cylinder 1 is connected to the air supply port 51 of a control valve 5 through a pipeline, the air inlet 52 of the control valve 5 is connected to an air source 7 through an air inlet pipe 6, and the control valve 5 is controlled by a controller 10 to perform opening and closing actions; the control valve 5 is adapted to divert the gas in the air source 7 into the cylinder 1 to drive the piston 3 to eject downward, or the control valve 5 is adapted to discharge the gas in the cylinder 1 outward through an exhaust port 53 to enable the piston 3 to rebound and reset; a bronchus 8 is arranged at one end of the air inlet pipe 6 close to the control valve 5, and the bronchus 8 conducts the air inlet pipe and the buffer chamber 2. The pneumatic cardiopulmonary resuscitation pressing device of the present invention is provided with a buffer chamber 2 at a position close to the cylinder, and the buffer chamber 2 is communicated with the air inlet pipe 6 through the bronchus 8. The air source 7 first injects isobaric gas into the buffer chamber 2, so that the buffer chamber can assist the air source to quickly supplement a sufficient amount of gas into the cylinder at the moment when the piston performs the downward pressing action, overcoming the drawback that the air pressure of the gas injected into the cylinder cannot reach the requirement due to the air resistance of the air supply pipe or the air source flow limitation, ensuring the quick downward pressing action of the piston, and meeting the requirements of the predetermined pressing frequency and pressing depth. The specific air supply method is as follows: in the normal state, the air source supplies air to the air inlet 52 of the control valve through the air inlet pipe 6 and supplies air to the buffer chamber 2 through the bronchus 8 at the same time; when the air inlet 52 and the air supply port 51 of the control valve are conducted, the gas of the air source and the buffer chamber simultaneously enter the cylinder through the air supply port 51 of the control valve to drive the piston to move downward to perform the pressing action; when the piston presses in place and starts to rebound, the control valve conducts the air supply port 51 and the exhaust port 52, and blocks the air path between the air inlet 52 and the air supply port 51 to restore the normal air supply. At this time, the gas in the cylinder is discharged to the atmosphere through the air supply port 51 and the exhaust port 53, and the piston moves upward under the action of the chest cavity rebound to restore. In this way, the cardiopulmonary resuscitation pressing action is completed reciprocally.

[0022] The pneumatic cardiopulmonary resuscitation pressing device switches the opening and closing state of the control valve at a certain frequency, so that the cylinder alternately inflates and deflates. During the inflation process, it is required that the piston overcome the resistance of the chest cavity and move quickly. To achieve good clinical results, it is required that the piston move 50 mm in about 120 ms. In an ideal state, if the air source flow rate is large enough and the air pipe air resistance is small enough, then the air pressure of the gas supplied from the air source into the cylinder is constant, and the piston can act according to the theoretical pressing frequency and pressing depth. However, since the air source of the pneumatic cardiopulmonary resuscitation pressing device in actual use is generally a gas storage tank of a certain volume, the air pressure in the gas storage tank will decrease as the air source is consumed, and then it will gradually affect the gas supply to the cylinder. Experiments show that for a traditional pneumatic cardiopulmonary resuscitation pressing device, when the air source flow rate is 168 liters per minute and the air source pressure P1 = 0.33 MPa, due to the existence of flow limitations or air pipe air resistance, the air pressure P2 at the cylinder inflation port will drop to 0.2 MPa or below, which makes the pressure generated by the cylinder piston become smaller and unable to reach the required pressing frequency and depth. However, since the large-flow constant-pressure gas supply time required during the cardiopulmonary resuscitation pressing process is very short (only required when the cylinder presses down), one pressing cycle is about 600 ms, and the inflation process is only about 120 ms, so the average flow rate does not need to be very large. The present invention provides a buffer chamber as close as possible to the cylinder, so that when the air source pressure drops to the point where it cannot inject gas into the cylinder in sufficient quantity, gas can be directly supplemented into the cylinder from the relatively close buffer chamber, and the flow rate of the air source (including the air pipe) only needs to meet the average flow rate. At this time, the air resistance effect of the intake pipe and the flow-limiting effect of various valves (such as pressure reducing valves, pressure stabilizing valves, flow limiting valves, etc.) on the intake pipe path are eliminated.

[0023] In this embodiment, a cylinder body 9 is sleeved outside the cylinder 1. The cylinder body 9 is coaxially arranged with the cylinder 1. Both ends of the cylinder body 9 are closed. The space between the inner side of the cylinder body 9 and the outer side of the cylinder 1 forms the buffer chamber 2, and the buffer chamber 2 is basically in the structure of an annular chamber.

[0024] In order to ensure that the buffer chamber can achieve an ideal effect of assisting air intake, the volume of the buffer chamber 2 is greater than or equal to 3 times the volume of the cylinder 1. According to a rough estimate, when the volume of the buffer chamber is 5 times the volume of the cylinder, when the air source pressure P1 = 0.33 MPa and the flow rate is 60 liters per minute, then the air pressure P2 at the intake port of the cylinder during inflation is basically 0.3 MPa, and the pressure drop is small, only about 10%. Therefore, it can meet the inflation requirements of the cylinder. As for the requirement that the buffer chamber be as close as possible to the cylinder, it is to minimize the air path air resistance as much as possible, and the gas in the buffer chamber depends on the structure of the specific device and does not necessarily require to be too large, otherwise the entire device will be extremely heavy.

[0025] In this embodiment, both ends of the buffer chamber 2 are flush with both ends of the cylinder 1. This setting makes the cylinder and the buffer chamber an integral structure, facilitating the movement of the piston.

[0026] To facilitate the reduction of pipeline settings, a valve plate 11 can be provided at the upper end surfaces of the buffer chamber 2 and the cylinder 1. The control valve 5 is installed on the valve plate, and corresponding pipelines or air inlets and outlets are engraved on the valve plate to facilitate the control valve to control the air intake channel or exhaust channel of the gas.

[0027] In this embodiment, the control valve 5 is a pneumatic control valve or an electric control valve, as long as it can meet the requirements of alternate inflation and exhaust of the cylinder, and the specific form is not limited.

[0028] The present invention not only solves the technical problem of insufficient inflation in the cylinder caused by air pipe resistance or flow limitation that has long troubled the pneumatic press, but also improves the clinical application environment of the pneumatic press, ensuring the clinical effect of the press under different gas sources. Since the press is a device for rescuing critically ill patients, the guarantee of its clinical effect cannot be measured by material benefits.

[0029] The shape of the buffer chamber provided in the above embodiment and its composition with the cylinder are only preferred solutions. Those skilled in the art should understand that under the guidance of the spirit and principle of the present invention, it is not limited to the above form. Other shapes of buffer chambers can also be used and can be separated from the cylinder. The above specific embodiments are only a detailed explanation of the technical solution of the present invention. Any improvement and substitution based on the above principle and spirit on the basis of the present invention should be within the protection scope of the present invention.

Claims

1. A pneumatic cardiopulmonary resuscitation pressing device, characterized in that: It includes a cylinder and a buffer chamber, and the buffer chamber is arranged close to the cylinder; a piston is arranged in the cylinder, a pressing head is connected to the ejecting end of the piston, the air inlet of the cylinder is connected to the air supply port of a control valve, the air inlet of the control valve is connected to a gas source through an air inlet pipe, and the control valve is adapted to divert the gas in the gas source into the cylinder to drive the piston to eject downward, or discharge the gas in the cylinder outward to make the piston rebound and reset; a branch pipe is arranged at one end of the air inlet pipe close to the control valve, the branch pipe is connected to the buffer chamber at a position close to the air inlet of the control valve, and conducts the air inlet pipe and the buffer chamber; a cylinder body is sleeved outside the cylinder, the cylinder body is coaxially arranged with the cylinder and both ends are closed, the space between the inner side of the cylinder body and the outer side of the cylinder forms the buffer chamber, and both ends of the buffer chamber are flush with both ends of the cylinder; the volume of the buffer chamber is greater than or equal to 3 times the volume of the cylinder; the control valve is a pneumatic control valve or an electric control valve.

2. The pneumatic cardiopulmonary resuscitation pressing device according to claim 1, characterized in that: A valve plate is arranged at the upper end surfaces of the buffer chamber and the cylinder, and the control valve is installed on the valve plate.

3. The pneumatic cardiopulmonary resuscitation pressing device according to claim 1 or 2, characterized in that: The control valve is controlled by a controller to perform opening and closing actions.

Images