Pressing device and cardio-pulmonary resuscitation machine

Abstract

The utility model relates to a pressing device. The shell is provided with a movable cavity. The movable mechanism comprises a piston assembly, a pressing assembly and an elastic piece, the piston assembly is located in the movable cavity, the pressing assembly is connected to the piston assembly and partially located outside the shell, the elastic piece is arranged on the periphery of the pressing assembly in a sleeving mode, the two ends of the elastic piece abut against the piston assembly and the inner wall of the shell correspondingly, and an oil storage groove is formed in the side, attached to the inner wall, of the piston assembly; the oil storage tank is used for containing pasty lubricating grease. The power assembly is connected to the shell and used for driving the piston assembly to reciprocate along the inner wall so as to drive the pressing assembly to stretch out or retract relative to the shell. When the piston assembly reciprocates, the lubricating grease in the oil storage tank can be released to lubricate the movable mechanism, the paste lubricating grease is higher in viscosity and can be adhered to the piston assembly and the surface of the inner wall of the shell, and volatilization of the lubricating grease is reduced. And the groove wall of the oil storage groove can block volatile matters and reduce the volatilization speed of the lubricating grease, so that the lubricating effect is prolonged, and friction and noise are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a pressing device and a cardiopulmonary resuscitation machine. Background Art

[0002] A cardiopulmonary resuscitation machine is a type of equipment that uses machinery to replace human labor to perform basic life support operations such as chest compressions, helping patients recover their own breathing and circulation. The cardiopulmonary resuscitation machine mainly drives the movable mechanism in the cylinder to perform up and down pressing movements. In order to reduce friction, lubricating oil is usually applied to the movable mechanism. However, the lubricating oil on the movable mechanism will evaporate quickly during the up and down movement of the movable mechanism, which can easily cause friction damage or noise to the movable mechanism. Utility Model Content

[0003] Based on this, it is necessary to provide a pressing device and a cardiopulmonary resuscitation machine to address the problem that the lubricating oil on the movable mechanism will evaporate quickly during the up and down movement of the movable mechanism, which may easily cause friction damage or noise to the movable mechanism.

[0004] In a first aspect, a pressing device comprises:

[0005] A housing having an active cavity;

[0006] A movable mechanism, comprising a piston assembly, a pressing assembly and an elastic member, wherein the piston assembly is located in the movable chamber, the pressing assembly is connected to the piston assembly and is partially located outside the housing, the elastic member is sleeved on the outer circumference of the pressing assembly, and its two ends are respectively abutted against the piston assembly and the inner wall of the housing, and an oil storage tank is provided on one side of the piston assembly abutting against the inner wall, and the oil storage tank is used to place paste grease; and

[0007] The power assembly is connected to the housing and is used to drive the piston assembly to reciprocate along the inner wall so as to drive the pressing assembly to extend or retract relative to the housing.

[0008] In one embodiment, the piston assembly includes a pushing member and a sealing member, the sealing member is embedded between the outer side of the pushing member and the inner wall, the pressing assembly is connected to the middle part of the pushing member, the two ends of the elastic member are respectively abutted against the pushing member and the inner wall, the oil storage tank is provided on the side of the seal and / or the pushing member that is close to the inner wall, and the power assembly is used to drive the pushing member and the sealing member to reciprocate along the inner wall.

[0009] In one embodiment, the seal is protruded toward the inner wall to form a first raised rib and a second raised rib. Along the thickness direction of the seal, the first raised rib and the second raised rib are spaced apart, and the ends of the two are abutted against the inner wall to form the oil storage groove.

[0010] In one embodiment, the sealing member is protruded toward the direction of the power assembly to form a first extension portion and a second extension portion, so that a recess is formed between the first extension portion and the second extension portion, the first extension portion is attached to the outer periphery of the first pushing member, and there is a gap between at least a portion of the second extension portion and the inner wall.

[0011] In one embodiment, the pressing device also includes a displacement sensor, which is arranged outside the shell. The piston assembly also includes a sensing member, which is connected to the side of the pushing member facing away from the power assembly. The sensing member is provided with a through hole extending through the sensing member along its thickness direction so that the pushing member is spaced around the outer periphery of the elastic member. The sensing member is used to reciprocate along the inner wall with the pushing member.

[0012] In one embodiment, the pressing device further includes a first buffer member, which is connected to the piston assembly and located at the top of the piston assembly, and the first buffer member moves away from or close to the inner wall along with the piston assembly.

[0013] In one embodiment, the pressing device further includes a second buffer member, which is connected to the inner wall and located at the bottom of the piston assembly, and the second buffer member moves away from or closer to the piston assembly along with the piston assembly.

[0014] In one embodiment, the pressing assembly includes a pressing push rod and a pressing head, one end of the pressing push rod is connected to the piston assembly, the pressing head is connected to the other end of the pressing push rod and is located outside the shell, and the elastic member is sleeved on the outer periphery of the pressing push rod.

[0015] In one embodiment, the oil storage tank is arranged around the outer circumference of the piston assembly.

[0016] In a second aspect, a cardiopulmonary resuscitation machine is provided, comprising the pressing device as described in the first aspect.

[0017] The oil storage tank provided on the piston assembly can hold a certain amount of paste grease. When the piston assembly reciprocates, the grease in the oil storage tank will be released to lubricate the movable mechanism, providing a lasting lubrication effect. The paste grease has a higher viscosity and can better adhere to the surface of the piston assembly and the inner wall of the housing, reducing the possibility of grease volatilization. The wall of the oil storage tank can block volatile substances and reduce the volatilization rate of the grease, thereby prolonging the lubrication effect and reducing the generation of friction and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a three-dimensional diagram of a pressing device provided in an embodiment of the present application.

[0019] FIG. 2 is an exploded view of a pressing device provided in an embodiment of the present application.

[0020] FIG. 3 is a cross-sectional view of a pressing device provided in an embodiment of the present application.

[0021] FIG. 4 is an enlarged view of point A in FIG. 3 .

[0022] FIG. 5 is a cross-sectional view of a sealing member in an embodiment of the present application.

[0023] Explanation of the reference numerals in the accompanying drawings: 10. Pressing device; 1. Shell; 11. Active chamber; 21. Piston assembly; 211. Oil storage tank; 212. Pushing member; 213. Sealing member; 22. Pressing assembly; 221. Pressing push rod; 222. Pressing head; 23. Elastic member; 24. First raised rib; 25. Second raised rib; 26. First extension portion; 27. Second extension portion; 28. Gap; 29. ​​Groove; 3. Power assembly; 4. Induction member; 5. First buffer member; 6. Second buffer member; 7. Base; 71. First through hole. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] Cardiopulmonary resuscitation, abbreviated as CPR, is an emergency rescue technique for cardiac and respiratory arrest. It is used to perform external chest compressions on patients with acute cardiac arrest, with the goal of restoring the patient's spontaneous breathing and circulation. Cardiopulmonary resuscitation machines are mainly used in medical places such as emergency rooms, resuscitation rooms, operating rooms or intensive care units, or in crowded places, remote and isolated areas. Cardiopulmonary resuscitation machines are used to perform cardiopulmonary resuscitation on patients with cardiac arrest and cardiopulmonary failure, which can maintain the patient's vital signs and improve the patient's survival rate.

[0026] The main pressing function in the cardiopulmonary resuscitation machine is performed by the pressing device. When the movable mechanism of the pressing device reciprocates, lubricating oil is usually applied to the movable mechanism to reduce friction. However, the lubricating oil on the movable mechanism will evaporate quickly during the up and down movement of the movable mechanism, which may easily cause friction damage or noise to the movable mechanism.

[0027] Based on this, an embodiment of the present application provides a cardiopulmonary resuscitation machine, including a housing, a pressing device contained in its own receiving cavity, and a control device. The housing can be a box, a body, or a bracket with a receiving cavity, and the shape of the housing can be a cube, a cuboid, or a cylinder. The pressing device is electrically connected to the control device, and can achieve mechanical pressing of a specific frequency under the action of the control device.

[0028] Please refer to Figures 1 and 2. The pressing device 10 includes a housing 1, a movable mechanism and a power assembly 3. The movable mechanism includes a piston assembly 21, a pressing assembly 22 and an elastic member 23. The housing 1 has an active chamber 11, the piston assembly 21 is located in the active chamber 11, the pressing assembly 22 is connected to the piston assembly 21 and is partially located outside the housing 1, the elastic member 23 is sleeved on the outer periphery of the pressing assembly 22, and its two ends are respectively abutted against the inner wall of the piston assembly 21 and the housing 1, and the side of the piston assembly 21 against the inner wall is provided with an oil storage tank 211, and the oil storage tank 211 is used to place paste grease. The power assembly 3 is connected to the housing 1, and is used to drive the piston assembly 21 to reciprocate along the inner wall to drive the pressing assembly 22 to extend or retract relative to the housing 1. The oil storage tank 211 provided on the piston assembly 21 can accommodate a certain amount of paste grease. When the piston assembly 21 reciprocates, the grease in the oil storage tank 211 will be released to lubricate the movable mechanism, providing a lasting lubrication effect. The paste-like grease has a higher viscosity and can adhere better to the surface of the movable mechanism, reducing the possibility of grease volatilization. The wall of the oil storage tank 211 can block volatile substances and reduce the volatilization speed of the grease, thereby prolonging the lubrication effect and reducing the generation of friction and noise.

[0029] It should be noted that the paste grease of the present application is similar to lipstick or lipstick-like grease and is in a solid state. When the surface of the piston assembly 21 contacts the inner wall of the housing 1, the paste grease can be applied along the contact surface of the two to achieve lubrication.

[0030] The oil storage grooves 211 can be arranged at intervals on the periphery of the piston assembly 21, and can be a plurality of independent small grooves. Alternatively, in some embodiments, the oil storage grooves 211 are arranged around the periphery of the piston assembly 21 to form an annular groove, which can hold more paste grease and can expand the lubrication area, thereby improving the durability of lubrication.

[0031] Please refer to Figures 1 and 2. In the embodiment of the present application, the housing 1 is cylindrical or columnar as a whole. An active chamber 11 is formed inside the housing 1 to accommodate a piston assembly 21 and an elastic member 23. The elastic member 23 can be a spring or a corrugated tube. The active chamber 11 is arranged in the middle area of ​​the housing 1 to facilitate manufacturing and processing. The housing 1 and the active chamber 11 in the present embodiment are both cylindrical, and in other embodiments, they can be set to a prismatic shape for easy access and transportation.

[0032] In the embodiment of the present application, the power component 3 includes a high-pressure gas introduction device (not shown in the drawings) and a pipeline connecting the introduction device and the shell 1. The high-pressure gas introduction device is installed on the outside of the shell 1 and is connected to the active chamber 11 of the shell 1 through a pipeline. The external air or oxygen is compressed and input into the active chamber 11 to provide power for the pressing operation of the active mechanism. The optional power component 3 includes an air compressor, a gas storage bottle, an output pipeline or an air pump, etc.

[0033] The housing 1 is arranged in the vertical direction so that the movement direction of the piston assembly 21 is the vertical direction. The gas enters the active chamber 11 of the housing 1 from the upper end, driving the piston assembly 21 to move downward, and the piston assembly 21 drives the pressing assembly 22 to press downward. The elastic member 23 is pressed to elastically deform. After the power assembly 3 is closed, the elastic member 23 restores the elastic deformation to push the piston assembly 21 back to the original position, thereby driving the pressing assembly 22 to lift upward, and so on, to achieve a pressing effect of a certain frequency. Please refer to Figure 3. The upper end surface of the housing 1 is provided with a first opening connected to the power assembly 3, and the lower end surface of the housing 1 is provided with a second opening for the pressing assembly 22 to extend out. One end of the elastic member 23 is located near the first opening and abuts against the piston assembly 21, and the other end is located at the second opening and abuts against the inner wall of the housing 1. Such a setting can maximize the use of the space in the housing 1 to increase the pressing stroke, ensure the stability of the vertical deformation of the elastic member 23, and improve the pressing performance.

[0034] Please refer to Figures 2 and 3. In some embodiments, the pressing assembly 22 includes a pressing push rod 221 and a pressing head 222. One end of the pressing push rod 221 is connected to the piston assembly 21, and the pressing head 222 is connected to the other end of the pressing push rod 221 and is located outside the housing 1. The elastic member 23 is sleeved on the outer periphery of the pressing push rod 221. The pressing push rod 221 and the pressing head 222 are split structures, which can be easily processed and assembled. The radial diameter of the pressing head 222 is larger than the radial diameter of the pressing push rod 221. The larger area of ​​the pressing head 222 can disperse the pressure on the patient's chest and reduce the risk of damage to local tissues. The larger area of ​​the pressing head 222 can provide a more stable and uniform pressing force, ensure that the pressing effect is more uniform and controllable, and reduce the formation of local high pressure points on the patient's chest, reduce possible damage, and help maintain the frequency and depth of pressing.

[0035] The material of the pressing rod 221 and the pressing head 222 can be metal material, inorganic non-metal material or polymer material such as silicone, etc., which has good impact resistance and is easy to process. Considering that the pressing head 222 directly contacts the human body during the pressing process, in order to reduce the pain of the patient during the rescue process, it is preferred to wrap a layer of flexible silicone on the outside of the metal pressing head 222 to reduce the impact.

[0036] Please refer to FIG. 3 . In some embodiments, the piston assembly 21 includes a pusher 212 and a seal 213. The seal 213 is embedded between the outer side and the inner wall of the pusher 212. The pressing assembly 22 is connected to the middle of the pusher 212. The two ends of the elastic member 23 are respectively in contact with the pusher 212 and the inner wall. The seal 213 and / or the pusher 212 are provided with an oil storage tank 211 on one side of the inner wall. The power assembly 3 is used to drive the pusher 212 and the seal 213 to reciprocate along the inner wall. Considering that if the pressing assembly 22 directly faces the power assembly 3, its cross-sectional area cannot meet the pushing requirements and is prone to lateral movement, causing damage to the equipment, a pushing assembly 212 is sleeved on the upper part of the pressing assembly 22 so that the pressing assembly 22 is connected to the middle of the pushing assembly 212 to expand the range of receiving thrust through the pushing assembly 212. The pusher 212 is directly opposite to the power assembly 3. After the high-pressure gas enters the active chamber 11, it acts evenly on the pusher 212, thereby applying an axial force to the pressing assembly 22 to prevent lateral movement. The sealing member 213 fits the inner wall of the housing 1, and the friction between them is very small. It can slide against the inner wall for sealing.

[0037] In some embodiments, the oil storage tank 211 may be arranged only on the pusher 212, or the oil storage tank 211 may be arranged only on the seal 213, or the oil storage tank 211 may be arranged on the pusher 212 or the seal 213 at the same time. In order to reduce friction, the radial diameter of the pusher 212 is set to be slightly smaller than the radial diameter of the inner wall of the housing 1. Under the condition of meeting the pushing requirement, the friction caused by the contact between the pusher 212 and the inner wall of the housing 1 can be avoided. The seal 213 is sleeved on the outer side of the pusher 212 to achieve the seal between the pusher 212 and the housing 1. At this time, only the seal 213 and the inner wall of the housing 1 are in contact between the seal 213 and the pusher 212, so that the oil storage tank 211 is arranged on the seal 213. Furthermore, if the oil storage tank 211 is arranged on the pusher 212, the pusher 212 is close to the inner wall, and the pusher 212 will be worn and leak oil after working for a period of time, and the entire pusher 212 needs to be replaced, which has high replacement cost and difficult assembly and processing. The oil storage tank 211 is arranged on the sealing member 213 , and the cost of replacing the sealing member 213 due to wear is low. Moreover, the sealing member 213 is installed on the outer side of the pushing member 212 , which is convenient for assembly and replacement.

[0038] The material of the seal 213 can be a rubber seal 213, such as nitrile rubber, chloroprene rubber or propylene rubber, etc., which has good sealing performance and oil resistance and heat resistance. Alternatively, it can be a polymer seal 213, such as polypropylene, polytetrafluoroethylene, silicone, etc. The above seals 213 are easy to process and shape, and are convenient for processing the oil storage tank 211.

[0039] Please refer to FIG. 5 . In some embodiments, the seal 213 is convexly provided toward the inner wall to form a first protruding rib 24 and a second protruding rib 25. Along the thickness direction of the seal 213, the first protruding rib 24 and the second protruding rib 25 are arranged at intervals, and the ends of the first protruding rib 24 and the second protruding rib 25 are abutted against the inner wall to form an oil storage tank 211. The provision of the first protruding rib 24 and the second protruding rib 25 can reduce the contact area between the seal 213 and the inner wall of the housing 1, thereby reducing friction, reducing the wear of the seal 213, and extending the service life. The first protruding rib 24 and the second protruding rib 25 can allow the seal 213 and the inner wall of the housing 1 to fully abut and seal, increase the structural strength and durability of the seal 213, improve the sealing effect, and reduce the risk of air leakage. Furthermore, the material usage of the seal 213 can be reduced, saving costs.

[0040] Please refer to FIG. 5 . In some embodiments, the sealing member 213 is convexly provided toward the direction of the power assembly 3 to form a first extension portion 26 and a second extension portion 27, so that a groove 29 is formed between the first extension portion 26 and the second extension portion 27. The first extension portion 26 is attached to the outer periphery of the first pusher 212, and a gap 28 is formed between at least a portion of the second extension portion 27 and the inner wall. As mentioned above, the pusher 212 provides a uniform axial force for the pressing assembly 22. In order to avoid the torque generated by the uneven force on the edge area of ​​the pusher 212, the sealing member 213 outside the pusher 212 is formed with a groove 29. After the high-pressure gas enters the active chamber 11, it diffuses and expands along the surface of the pusher 212. The space at the groove 29 is larger, and the gas is more likely to diffuse there, which can balance the thrust at the edge of the pusher 212 and the center area of ​​the pusher 212, so that the thrust on the pusher 212 and the sealing member 213 is uniform and consistent in direction, and the pressing effect of the pressing assembly 22 is prevented from being reduced due to the torque. Furthermore, a gap 28 is provided between at least a portion of the second extension portion 27 and the inner wall. In other words, a portion of the second extension portion 27 is in contact with the inner wall of the shell 1 to seal, and the other portion is spaced apart from the first raised rib 24 so as to leave a gap 28 between the second extension portion 27 and the inner wall of the shell 1 to reduce friction.

[0041] Please refer to FIG. 3. In some embodiments, the pressing device 10 further includes a displacement sensor, which is arranged outside the housing 1. The piston assembly 21 further includes a sensing member 4, which is connected to the side of the pusher 212 away from the power assembly 3. The sensing member 4 is provided with a through hole running through its own thickness direction, so that the pusher 212 is arranged at intervals around the outer periphery of the elastic member 23, and the sensing member 4 is used to reciprocate along the inner wall with the pusher 212. The displacement sensor can accurately detect and record the pressing depth, ensure that the pressing depth meets the guidance standard, and improve the effect of cardiopulmonary resuscitation. The displacement sensor can provide real-time pressing depth feedback, help the operator adjust the strength and rhythm, correct improper pressing operations in time, and ensure the pressing quality. The displacement sensor can record the pressing depth data for subsequent analysis, help medical staff understand the quality of cardiopulmonary resuscitation operations, and make improvements and adjustments. The displacement sensor can be a magnetic sensor, a capacitive sensor, or a piezoelectric sensor. Or the sensing member 4 can be a metal such as a magnet, copper or aluminum.

[0042] Please refer to Figures 2 and 3. In some embodiments, the pressing device 10 also includes a first buffer 5. The first buffer 5 is connected to the piston assembly 21 and is located at the top of the piston assembly 21. The first buffer 5 reciprocates with the piston assembly 21 away from or close to the inner wall. It can be understood that the elastic member 23 is compressed after absorbing a large amount of energy, and it will inevitably release a large amount of energy when it stretches, generating a strong impact force. In order to avoid the loss caused by the collision between the piston assembly 21 and the inner wall of the housing 1, it is necessary to set the first buffer 5 between the piston assembly 21 and the power assembly 3 to eliminate the excess impact force. The first buffer 5 can be made of flexible rubber, which is easy to obtain and low in cost. In other schemes, the material of the first buffer 5 can be sponge.

[0043] Please refer to Figures 1 to 3. A base 7 is installed at one end of the housing 1 away from the power assembly 3. The base 7 abuts against the bottom end of the housing 1, and partially extends into the active cavity 11 of the housing 1 and is sleeved on the outer periphery of the pressing assembly 22. The base 7 is provided with a first through hole 71. The pressing assembly 22 passes through the first through hole 71 and is partially located outside the base 7. The part of the base 7 located in the active cavity 11 can block the piston assembly 21 from continuing to move, and plays the role of limiting and guiding.

[0044] Please refer to Figures 1 to 3. In some embodiments, the pressing device 10 also includes a second buffer 6, which is connected to the inner wall and located at the bottom of the piston assembly 21. The second buffer 6 reciprocates with the piston assembly 21 to move away from or closer to the piston assembly 21. It can be understood that the power component 3 will generate a strong impact force in the process of pushing the pressing component 22 to descend. In order to avoid the loss caused by the collision between the piston assembly 21 and the inner wall of the shell 1, it is necessary to set the second buffer 6 between the piston assembly 21 and the inner wall of the shell 1 to eliminate the excess impact force. The second buffer 6 can be made of flexible rubber, which is easy to obtain and low in cost. In other schemes, the material of the second buffer 6 can be sponge.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A pressing device, characterized in that: include: A housing having an active cavity; The movable mechanism comprises a piston assembly, a pressing assembly and an elastic member, wherein the piston assembly is located in the movable chamber, the pressing assembly is connected to the piston assembly and is partially located outside the housing, the elastic member is sleeved on the outer periphery of the pressing assembly, and its two ends are respectively abutted against the piston assembly and the inner wall of the housing, and an oil storage tank is provided on one side of the piston assembly abutting against the inner wall, and the oil storage tank is used to place paste grease; as well as The power assembly is connected to the housing and is used to drive the piston assembly to reciprocate along the inner wall so as to drive the pressing assembly to extend or retract relative to the housing.

2. The pressing device according to claim 1, characterized in that: The piston assembly includes a pushing member and a sealing member, wherein the sealing member is embedded between the outer side of the pushing member and the inner wall, the pressing assembly is connected to the middle part of the pushing member, the two ends of the elastic member are respectively abutted against the pushing member and the inner wall, the oil storage tank is provided on one side of the sealing member and / or the pushing member that is close to the inner wall, and the power assembly is used to drive the pushing member and the sealing member to reciprocate along the inner wall.

3. The pressing device according to claim 2, characterized in that: The seal is protruded toward the inner wall to form a first protruding rib and a second protruding rib. Along the thickness direction of the seal, the first protruding rib and the second protruding rib are arranged at intervals, and the ends of the two are abutted against the inner wall to form the oil storage groove.

4. The pressing device according to claim 2, characterized in that: The sealing member is protruded toward the direction of the power assembly to form a first extension portion and a second extension portion, so that a recess is formed between the first extension portion and the second extension portion, the first extension portion is attached to the outer periphery of the pusher, and there is a gap between at least part of the second extension portion and the inner wall.

5. The pressing device according to claim 2, characterized in that: The pressing device also includes a displacement sensor, which is arranged outside the shell. The piston assembly also includes a sensing member, which is connected to the side of the pushing member facing away from the power assembly. The sensing member is provided with a through hole that penetrates along its own thickness direction so that the pushing member is arranged at intervals around the outer periphery of the elastic member. The sensing member is used to reciprocate along the inner wall with the pushing member.

6. The pressing device according to any one of claims 1 to 5, characterized in that: The pressing device further comprises a first buffer, which is connected to the piston assembly and located at the top of the piston assembly. The first buffer moves away from or close to the inner wall along with the piston assembly.

7. The pressing device according to any one of claims 1 to 5, characterized in that: The pressing device further comprises a second buffer, which is connected to the inner wall and located at the bottom of the piston assembly. The second buffer moves away from or close to the piston assembly along with the piston assembly.

8. The pressing device according to any one of claims 1 to 5, characterized in that: The pressing assembly includes a pressing push rod and a pressing head, one end of the pressing push rod is connected to the piston assembly, the pressing head is connected to the other end of the pressing push rod and is located outside the shell, and the elastic member is sleeved on the outer periphery of the pressing push rod.

9. The pressing device according to any one of claims 1 to 5, characterized in that: The oil storage tank is arranged around the outer circumference of the piston assembly.

10. A cardiopulmonary resuscitation machine, characterized in that: The cardiopulmonary resuscitation machine comprises the pressing device according to any one of claims 1 to 9.

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