CN110893143A

CN110893143A - Pneumatic cardio-pulmonary resuscitation pressing device

Info

Publication number: CN110893143A
Application number: CN201910985903.2A
Authority: CN
Inventors: 孔伟方; 章军辉; 方志庆; 严跃明; 方志平
Original assignee: Suzhou Still Medical Technology Co Ltd
Current assignee: Suzhou Still Medical Technology Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-03-20
Also published as: WO2021073614A1

Abstract

The invention discloses a pneumatic cardio-pulmonary resuscitation pressing device which comprises an air cylinder and a buffer cavity, wherein the buffer cavity is arranged close to the air cylinder; a piston is arranged in the cylinder, the ejection end of the piston is connected with a pressing head, an air inlet of the cylinder is connected with an air supply port of a control valve, and an air inlet of the control valve is connected with an air source through an air inlet pipe; and one end of the air inlet pipe, which is close to the control valve, is provided with a bronchus which conducts the air inlet pipe with the buffer cavity. The pneumatic cardio-pulmonary resuscitation pressing device not only solves the technical problem of insufficient inflation in the air cylinder caused by air resistance of the trachea or flow limitation which troubles the pneumatic pressing device for a long time, but also improves the clinical applicable environment of the pneumatic pressing device, so that the clinical effect of the pressing device can be ensured under the condition of different air sources.

Description

Pneumatic cardio-pulmonary resuscitation pressing device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a pneumatic cardio-pulmonary resuscitation pressing device.

Background

The cardiopulmonary resuscitation compression device is one of the most important devices used in medical emergencies. The existing pressing device is mainly pneumatic, the clinical effect of the pneumatic pressing device is generally accepted, and the pressing device is the first-choice first-aid equipment for first aid in hospitals.

Present pneumatic pressing device ubiquitous a problem to do not obtain effectual solution all the time, also promptly because the trachea of connecting cylinder and air supply has the air lock, perhaps because the flow restriction of air supply, can make piston move in the cylinder and slow down, can not reach the specified depth of pressing even when the frequency of pressing of regulation, and then seriously influence clinical first aid effect.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of the existing pneumatic cardio-pulmonary resuscitation pressing device, and further provide the pneumatic cardio-pulmonary resuscitation pressing device capable of eliminating the influence of trachea air resistance or air source flow limitation on the pressing depth of the piston.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pneumatic cardio-pulmonary resuscitation pressing device comprises a cylinder and a buffer cavity, wherein the buffer cavity is arranged close to the cylinder; a piston is arranged in the cylinder, the ejection end of the piston is connected with a pressing head, an air inlet of the cylinder is connected with an air supply port of a control valve, the air inlet of the control valve is connected with an air source through an air inlet pipe, and the control valve is suitable for guiding air in the air source into the cylinder to drive the piston to eject downwards or discharging the air in the cylinder outwards so as to facilitate rebound resetting of the piston; and one end of the air inlet pipe, which is close to the control valve, is provided with a bronchus which conducts the air inlet pipe with the buffer cavity.

Preferably, the buffer cavity is attached to the outer wall of the cylinder, and the branch pipe is connected to a position, close to the air inlet of the control valve, of the buffer cavity.

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

Preferably, the outside cover of cylinder is equipped with the barrel, the barrel with the cylinder is coaxial to be set up, the both ends of barrel are sealed, the inboard of barrel with space between the outside of cylinder forms the cushion chamber.

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

Preferably, the buffer cavity and the upper end face of the cylinder are provided with a valve plate, and the control valve is installed on the valve plate.

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

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

The invention has the beneficial effects that:

the pneumatic cardio-pulmonary resuscitation pressing device not only solves the technical problem of insufficient inflation in the air cylinder caused by air resistance of the trachea or flow limitation which troubles the pneumatic pressing device for a long time, but also improves the clinical applicable environment of the pneumatic pressing device, so that the clinical effect of the pressing device can be ensured under the condition of different air sources.

Drawings

In order that the present invention may be more readily and clearly understood, reference is now made to the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of a vertical half-section at the cylinder of the pneumatic cardiopulmonary resuscitation compression device of the present invention;

fig. 2 is a schematic horizontal projection structure of the pneumatic cardiopulmonary resuscitation pressing device cylinder and the buffer chamber of the present invention.

The reference numbers in the figures denote:

1-a cylinder; 2-a buffer chamber; 3-a piston; 4-pressing head; 5-a control valve; 51-an air supply port; 52-an air inlet; 53-exhaust port; 6, an air inlet pipe; 7-gas source; 8-bronchus; 9-a cylinder body; 10-a controller; 11-valve plate.

Detailed Description

Referring to fig. 1, a pneumatic cardio-pulmonary resuscitation pressing device comprises a cylinder 1 and a buffer chamber 2, wherein the buffer chamber 2 is arranged close to the cylinder 1; a piston 3 is arranged in the cylinder 1, the ejection end of the piston 3 is connected with a pressing head 4, the pressing head 4 moves up and down along with the piston to perform cardio-pulmonary resuscitation pressing action, an air inlet of the cylinder 1 is connected with an air supply port 51 of a control valve 5 through a pipeline, an air inlet 52 of the control valve 5 is connected with 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 suitable for guiding the gas in the gas source 7 into the cylinder 1 to drive the piston 3 to eject downwards, or the control valve 5 is suitable for discharging the gas in the cylinder 1 outwards through an exhaust port 53 to enable the piston 3 to rebound and reset; one end of the air inlet pipe 6, which is close to the control valve 5, is provided with a bronchus 8, and the bronchus 8 conducts the air inlet pipe with the buffer cavity 2. According to the pneumatic cardio-pulmonary resuscitation pressing device, the buffer cavity 2 is arranged at a position close to the cylinder, the buffer cavity 2 is communicated with the air inlet pipe 6 through the bronchus 8, the air source 7 injects isobaric air into the buffer cavity 2 firstly, so that the buffer cavity can assist the air source to rapidly supplement sufficient air into the cylinder at the moment when the piston performs a pressing action, the defect that the air pressure of the air injected into the cylinder cannot meet the requirement due to air resistance of the air supply pipe or air source flow limitation is overcome, and the rapid pressing action of the piston is ensured so as to meet the requirements of preset pressing frequency and pressing depth. The specific air supply mode is as follows: in a normal state, the air source supplies air to the air inlet 52 of the control valve through the air inlet pipe 6 and simultaneously supplies air to the buffer cavity 2 through the bronchus 8; when the air inlet 52 of the control valve is communicated with the air supply port 51, the air of the air supply and the buffer cavity is simultaneously filled into the cylinder through the air supply port 51 of the control valve to push the piston to move downwards to execute a pressing action; when the piston starts to rebound after being pressed to the right position, the control valve conducts the air inlet 51 and the air outlet 52, and blocks the air passage between the air inlet 52 and the air inlet 51 to return to normal air supply, at the moment, the air in the cylinder exhausts to the atmosphere through the air inlet 51 and the air outlet 53, and the piston moves upwards to return under the rebound effect of the thoracic cavity. The cardio-pulmonary resuscitation pressing action is completed in such a reciprocating way.

The pneumatic cardio-pulmonary resuscitation pressing device switches the opening and closing states of the control valve according to a certain frequency, so that the air cylinder alternately inflates and deflates. The piston is required to move rapidly against the resistance of the chest during inflation. To achieve good clinical results, a piston movement of 50mm requires about 120 ms. Ideally, if the air source flow is large enough and the air tube air resistance is small enough, the air pressure supplied by the air source into the cylinder is constant, and the piston can act according to the theoretical compression frequency and compression depth. However, the air source of the pneumatic cardiopulmonary resuscitation pressing device in practical use is generally an air storage tank with a certain volume, and the air pressure in the air storage tank can be reduced along with the consumption of the air source, so that the air supply to the air cylinder can be gradually influenced. Experiments show that when the air source flow is 168 liters per minute and the air source pressure P1 is 0.33MPa, the air pressure P2 reaching the air charging port of the air cylinder can be reduced to 0.2MPa or below due to the existence of flow limitation or air resistance of the air pipe, so that the pressure generated by the piston of the air cylinder is reduced and the required pressing frequency and depth cannot be achieved. However, the average flow rate is not very high because the large-flow constant-pressure air supply time required in the cardiopulmonary resuscitation compression process is very short (only required when the air cylinder is pressed down), and one compression period is about 600ms, wherein the air charging process is only about 120 ms. The buffer cavity is arranged at the position as close to the cylinder as possible, so that gas can be supplemented into the cylinder from the closer buffer cavity directly when the pressure of a gas source is reduced to the state that the gas cannot be injected into the cylinder in a sufficient amount, the flow of the gas source (including a gas pipe) only needs to meet the average flow, and the air resistance function of the gas inlet pipe and the flow limiting function of valves (such as a pressure reducing valve, a pressure stabilizing valve, a flow limiting valve and the like) on the gas inlet pipe are eliminated.

In this embodiment, the outside cover of cylinder 1 is equipped with barrel 9, barrel 9 with the coaxial setting of cylinder 1, the both ends of barrel 9 are sealed, the inboard of barrel 9 with space between the outside of cylinder 1 forms cushion chamber 2, cushion chamber 2 is annular cavity structures basically.

In order to ensure that the buffer cavity can achieve the air intake assisting effect with ideal effect, the volume of the buffer cavity 2 is more than or equal to 3 times of the volume of the cylinder 1. According to rough estimation, when the volume of the buffer cavity is 5 times of the volume of the cylinder, when the pressure P1 of the air source is 0.33MPa, and the flow rate is 60 liters/minute, the pressure P2 at the air inlet of the cylinder is basically 0.3MPa when the cylinder is inflated, the pressure drop is less, and is only about 10%, so that the inflation requirement of the cylinder can be met. The buffer chamber is required to be as close to the cylinder as possible in order to reduce air resistance of the air path as much as possible, and the air in the buffer chamber is not required to be too large according to the structure of the specific equipment, so that the whole equipment is heavy and cumbersome.

In this embodiment, two ends of the buffer cavity 2 are flush with two ends of the cylinder 1. The arrangement mode enables the air cylinder and the buffer cavity to be of an integrated structure, and movement of the piston is facilitated.

In order to reduce the arrangement of pipelines, a valve plate 11 can be arranged on the upper end face of the buffer cavity 2 and the cylinder 1, the control valve 5 is installed on the valve plate, and a corresponding pipeline or an air inlet and outlet is carved on the valve plate, so that the control valve can control an air inlet channel or an air exhaust channel of air.

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

The invention not only solves the technical problem of insufficient inflation in the cylinder caused by air resistance of the trachea or flow limitation which troubles the pneumatic pressing device for a long time, but also improves the clinical applicable environment of the pneumatic pressing device, so that the clinical effect of the pressing device can be ensured under the condition of different air sources. As the pressing device is an instrument for rescuing critical patients, the guarantee of the clinical effect cannot be measured by the material benefit.

The shape of the buffer chamber and its structure with the cylinder provided in the above embodiments are only preferred, and it should be understood by those skilled in the art that the invention is not limited to the above forms, and other buffer chambers with different shapes and separated from the cylinder may be adopted. The above embodiments are merely to explain the technical solutions of the present invention in detail, and all modifications and substitutions based on the above principles and spirit should be within the protection scope of the present invention.

Claims

1. A pneumatic cardiopulmonary resuscitation press device characterized in that: the buffer device comprises a cylinder and a buffer cavity, wherein the buffer cavity is arranged close to the cylinder; a piston is arranged in the cylinder, the ejection end of the piston is connected with a pressing head, an air inlet of the cylinder is connected with an air supply port of a control valve, the air inlet of the control valve is connected with an air source through an air inlet pipe, and the control valve is suitable for guiding air in the air source into the cylinder to drive the piston to eject downwards or discharging the air in the cylinder outwards to enable the piston to rebound and reset; and one end of the air inlet pipe, which is close to the control valve, is provided with a bronchus which conducts the air inlet pipe with the buffer cavity.

2. Pneumatic cardiopulmonary resuscitation compression device according to claim 1, characterized in that: the buffer cavity is attached to the outer wall of the air cylinder, and the branch air pipe is connected to the position, close to the air inlet of the control valve, of the buffer cavity.

3. Pneumatic cardiopulmonary resuscitation compression device according to claim 1 or 2, characterized in that: the volume of the buffer cavity is more than or equal to 3 times of the volume of the cylinder.

4. Pneumatic cardiopulmonary resuscitation compression device according to claim 3, characterized in that: the outside cover of cylinder is equipped with the barrel, the barrel with the cylinder is coaxial to be set up, the both ends of barrel are sealed, the inboard of barrel with space between the outside of cylinder forms the cushion chamber.

5. Pneumatic cardiopulmonary resuscitation compression device according to claim 4, characterized in that: and two ends of the buffer cavity are flush with two ends of the air cylinder.

6. Pneumatic cardiopulmonary resuscitation compression device according to claim 4, characterized in that: the buffer cavity the up end department of cylinder is provided with the valve plate, the control valve is installed on the valve plate.

7. Pneumatic cardiopulmonary resuscitation compression device according to claim 1, characterized in that: the control valve is a pneumatic control valve or an electric control valve.

8. Pneumatic cardiopulmonary resuscitation compression device according to claim 1, characterized in that: the control valve is controlled by the controller to perform opening and closing actions.