Air-oxygen mixer for extracorporeal circulation

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to an air-oxygen mixer for extracorporeal circulation, which comprises a mixer shell and a mixer main body arranged in the mixer shell, the mixer main body comprises a mixing tank, a guide pipe arranged in the mixing tank along the length direction of the mixing tank, and a slide block slidably arranged on the outer surface of the guide pipe in a penetrating manner; the peripheral side surface of the sliding block is in sliding connection with the inner wall of the mixing tank, a plurality of first through holes penetrating through one another are formed in the two end faces of the sliding block, one end of the guide pipe extends out of the mixing tank and communicates with a first gas source used for supplying oxygen, and a plurality of gas outlet holes are formed in the peripheral side surface of the guide pipe; a reciprocating thread arranged in the length direction of the guide pipe is further formed in the outer surface of the guide pipe, the surface, making contact with the guide pipe, of the sliding block is matched with the reciprocating thread, and the mixer body further comprises a driving assembly used for driving the sliding block to move. The mixing efficiency is relatively low.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an air-oxygen mixer for extracorporeal circulation. Background Art

[0002] The main function of an air-oxygen mixer is to adjust and control the mixing ratio of oxygen and air to ensure that the patient can get the appropriate oxygen concentration when inhaling oxygen. It is usually composed of an air-oxygen mixing chamber, an oxygen concentration adjustment mechanism, a flow meter, and an air outlet to ensure that the mixed oxygen can meet the needs of people of different ages. Currently, the air-oxygen mixers on the market usually use structures such as buoy mixers, mechanical membrane mixers, electronic proportion mixers, and jet principle mixers to achieve the mixing of oxygen and air; among them, mechanical membrane mixers are widely used due to their simple structure, low cost, and stable operation. For example, a Chinese patent discloses a medical air-oxygen mixer (patent announcement number: CN116531631A), which drives the transmission shaft and the transmission block to rotate through a transmission motor. The rotation of the transmission block will synchronize the movement of the connecting rod and the transmission rod, so that the second piston block and the first piston block are displaced left and right, and oxygen and air can be extracted from the first oxygen inlet pipe and the first air inlet pipe, the second oxygen inlet pipe and the second air inlet pipe, and then the mixed gas is discharged from the first outlet pipe or the second outlet pipe, that is, the oxygen and air can be mixed without the need for an external fan injection, which can effectively reduce electric energy.

[0003] Although the above technical solution can draw both air and oxygen into a chamber and mix them, only stirring and mixing the air and oxygen by rotating the stirring impeller cannot effectively and evenly stir the gas in the shell, because the movement of the piston block will drive the stirring impeller to move, and the stirring impeller will only disturb the surrounding air when it rotates. Some air is not stirred evenly, and there are dead corners. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an air-oxygen mixer for extracorporeal circulation, which can solve the problem that the current air-oxygen mixer cannot evenly mix air and oxygen and has low mixing efficiency.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An air-oxygen mixer for extracorporeal circulation, comprising a mixer housing and a mixer body arranged inside the mixer housing, the mixer body comprising a mixing tank, a conduit arranged inside the mixing tank along the length direction thereof, and a slider slidably penetrated on the outer surface of the conduit, the conduit, the slider and the mixing tank are coaxially arranged, the peripheral surface of the slider is slidably connected to the inner wall of the mixing tank, and both end surfaces of the slider are provided with a plurality of first through holes that penetrate each other, one end of the conduit extends out of the mixing tank and is connected to a first gas source for supplying oxygen, and the peripheral surface of the conduit is provided with a plurality of gas outlets located inside the mixing tank, the outer surface of the conduit is also provided with a reciprocating thread arranged along the length direction thereof, and the surface of the slider in contact with the conduit cooperates with the reciprocating thread;

[0007] The mixer body also includes a driving assembly for driving the slider to move, the driving assembly includes a plurality of guide blocks arranged at intervals around the circumference of the conduit and rotating rings arranged at both ends of the guide blocks, the rotating rings are coaxially arranged with the mixing tank and rotatably connected thereto, and both ends of each guide block are fixed to adjacent rotating rings, a stirring blade is fixed on the surface of each guide block, and the slider slides through each guide block and the stirring blade, wherein any of the rotating rings is connected to a power source for driving the rotation thereof, one end of the mixing tank is connected to a second air source for supplying air along its length direction, and the outer surface of the mixing tank is connected to an air outlet joint away from this end.

[0008] Furthermore, a coaxial partition block is provided in the mixing tank, and the partition block evenly divides the interior of the mixing tank into two equal volumes, a first chamber and a second chamber, and all components arranged in the first chamber and the second chamber are mirror-imaged with respect to the partition block, wherein the rotating rings fixed at one end of the multiple guide blocks are coaxially rotatably arranged on the surface of the partition block, and the two sliders in the first chamber and the second chamber move synchronously toward each other.

[0009] Furthermore, each of the sliding blocks has two side surfaces opposite to the inner wall of the mixing tank that are commonly connected to a telescopic airbag, and one end of the telescopic airbag is rotatably connected to the sliding block. The first through hole, conduit, guide block and stirring blade are all within the coverage range of the corresponding telescopic airbag, and one end of each telescopic airbag away from the sliding block is connected to the second air source.

[0010] Furthermore, the diameter of each first through hole gradually decreases along its axial direction, and the end with the larger diameter faces the adjacent telescopic airbag. Each first through hole is also provided with a one-way valve that limits the gas to flow only from the larger diameter to the smaller diameter side.

[0011] Furthermore, each of the stirring blades is arranged along the radial direction of the conduit, and the surface of each stirring blade is provided with a plurality of second through holes arranged at intervals along its length direction. The diameter of each of the second through holes gradually decreases along its axial direction, and when the stirring blade rotates around the conduit, air enters the side of the second through hole with a larger diameter.

[0012] Furthermore, the diameter of the mixing tank gradually decreases from the middle toward both ends, and the spacing between the two sliders is greater than or equal to half the length of the first chamber, wherein each of the air outlet holes is arranged near the port of the mixing tank, and all the air outlet holes are located within half the length of the corresponding first chamber and second chamber.

[0013] Furthermore, the outer surface of the mixing tank is provided with two air outlet joints connected to the first chamber and the second chamber, and the two air outlet joints are respectively arranged at the two end surfaces close to the partition block, the free end of each of the air outlet joints is connected to a buffer chamber, and a gas concentration sensor is provided in each buffer chamber, the outer surface of each buffer chamber is connected to a plurality of connecting hoses for replenishing air and oxygen, and a solenoid valve is provided on the passage of each connecting hose, the two buffer chambers are also commonly connected to an air outlet pipe, and the free end of the air outlet pipe is connected to an external oxygen mask.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention adopts reasonable arrangement of components such as a mixing tank, an air guide pipe, a movable ring and an air outlet, so that the flow paths of air and oxygen entering the mixing tank are perpendicular to each other, thereby achieving the first mixing. Subsequently, the gas in the mixing tank is stirred by the cooperation of a guide block and a stirring blade, thereby further improving the uniformity of the mixed gas and achieving the second mixing. The slider reciprocates along the length direction of the conduit, squeezing the mixed gas and causing it to flow out along the radially changing first through hole, thereby further disturbing the mixed gas and achieving the third mixing, thereby effectively improving the uniformity of air-oxygen mixing.

[0016] 2. By arranging a partition block in the mixing tank to divide the internal air into two first chambers and a second chamber of equal volume, and arranging a telescopic air bag in each chamber, and arranging a one-way valve on each first through hole, the standardization of the concentration of air and oxygen after mixing can be effectively guaranteed, and the working stroke of each slider is also reduced, which can speed up the efficiency of air-oxygen mixing.

[0017] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a schematic diagram of the structure of the mixer housing of the present invention;

[0020] Figure 2 It is a front schematic diagram of the mixer housing structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal structure of the mixing tank of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the sealed housing of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the slider of the present invention;

[0024] Figure 6 for Figure 5 Section view at AA in the middle.

[0025] The following are marked in the accompanying drawings:

[0026] 1 mixer housing, 2 mixer body, 201 mixing tank, 202 conduit, 203 slider, 204 guide block, 205 rotating ring, 3 first through hole, 4 air outlet, 5 reciprocating thread, 6 stirring blade, 7 blade, 8 sealing shell, 9 partition block, 10 first chamber, 11 second chamber, 12 air outlet joint, 13 telescopic airbag, 14 second through hole, 15 buffer chamber, 16 one-way valve. DETAILED DESCRIPTION

[0027] like Figure 1 to Figure 6 As shown,

[0028] An air-oxygen mixer for extracorporeal circulation, comprising a mixer housing 1 and a mixer body 2 arranged inside the mixer housing, wherein the mixer body 2 comprises a mixing tank 201, a conduit 202 arranged inside the mixing tank 201 along the length direction thereof, and a slider 203 slidably arranged on the outer surface of the conduit 202, wherein the slider 203 is circular, the conduit 202, the slider 203 and the mixing tank 201 are coaxially arranged, the peripheral side surface of the slider 203 is slidably connected to the inner wall of the mixing tank 201, and the two end surfaces of the slider 203 are provided with a plurality of first through holes 3 which penetrate each other, and the axis of each first through hole 3 is The line is parallel to the axis of the slider 203, one end of the conduit 202 extends out of the mixing tank 201 and is connected to a first gas source for supplying oxygen (the first gas source is not shown in the figure), and a plurality of gas outlet holes 4 located inside the mixing tank 201 are provided on the peripheral surface of the conduit 202, and a reciprocating thread 5 is also provided on the outer surface of the conduit 202 along its length direction, and the initial reciprocating thread 5 is also provided in the mixing tank 201, and the surface of the slider 203 in contact with the conduit 202 cooperates with the reciprocating thread 5, and reciprocates along the length direction of the conduit 202 under the action of the reciprocating thread 5;

[0029] The mixer body 2 also includes a driving assembly for driving the slider 203 to move, the driving assembly includes three guide blocks 204 arranged at intervals around the circumference of the conduit 202 and rotating rings 205 arranged at both ends of the guide blocks 204, the rotating rings 205 are coaxially arranged with the mixing tank 201 and rotatably connected thereto, and both ends of each guide block 204 are welded and fixed to the adjacent rotating rings 205, a stirring blade 6 is fixed on the surface of each guide block 204, and the slider 203 is slidably arranged on each guide block 204 and the stirring blade 6, wherein any of the rotating rings 205 is connected to a power source that drives it to rotate, combined with Figure 4 As described in the figure, this power source is composed of any of the rotating rings 205 and a plurality of blades 7 circumferentially arranged on the outer surface of the rotating ring 205, each blade 7 is located outside the mixing tank 201, and the outer surface of the rotating ring 205 is rotatably connected to a circular sealed shell 8 coaxially arranged therewith, the sealed shell 8 is fixed to one end of the mixing tank 201, each blade 7 is located inside the sealed shell 8, and the circumferential side surface of the circular sealed shell 8 is connected to a second air source for supplying air (the second air source is not shown in the figure), the output end of the second air source is tangent to the rotation direction of each blade 7, the sealed shell 8 is also connected to the inside of the mixing tank 201, the gas output from the outlet end of the second air source passes through the sealed shell 8 and enters the mixing tank 201 along the length direction of the conduit 202, and the outer surface of the mixing tank 201 is connected to an outlet joint 12 away from the sealed shell 8.

[0030] As shown in the figure, when it is necessary to prepare a mixed gas of air and oxygen of a certain concentration, the first gas source and the second gas source are opened respectively and the gases are introduced into the mixing tank 201. The air output by the second gas source will impact the blades 7 when passing through the sealed shell 8 and drive the rotating ring 205 to rotate, and then enter the mixing tank 201 through the port of the mixing tank 201 along the length direction of the conduit 202, while the oxygen output by the first gas source enters the mixing tank 201 through the air outlet 4 provided on the outer surface of the conduit 202. Since the oxygen is output through the air outlet 4 along the radial direction of the conduit 202, which is perpendicular to the flow direction of the air, the air and oxygen collide and mix for the first time in the mixing tank 201; and when the rotating ring 205 rotates in one direction under the action of the blades 7 and the air, it will synchronously drive each guide block 204, the stirring blade 6 and the slider 203 to rotate, and the stirring blade 6 While rotating, the air and oxygen inside the mixing tank 201 are disturbed, causing them to mix for the second time. Since the outer surface of the conduit 202 is provided with a reciprocating thread 5, the slider 203 reciprocates along the length direction of the conduit 202 while rotating, and the surface of the slider 203 is provided with a plurality of first through holes 3, therefore, the slider 203 causes the air-oxygen mixed gas to pass through each first through hole 3 while reciprocating. Since the air-oxygen mixed gas suddenly passes through the narrow first through hole 3, the flow rate of the air-oxygen mixed gas after flowing out of the first through hole 3 is increased, and combined with the rotation of the slider 203, the air-oxygen mixed gas flowing out of the first through hole 3 is mixed for the third time again under the action of the increased flow rate and rotation, which greatly improves the mixing uniformity of air and oxygen. After mixing, the air-oxygen mixed gas flows to the oxygen mask or other designated positions through the gas outlet connector 12.

[0031] Among them, in order to further explain that the slider 203 disturbs the gas in the mixing tank 201 when it moves, the slider 203 is close to the port of the mixing tank 201 as the starting position, and the slider 203 moves to the port away from the mixing tank 201 as the ending position (of course, this distance is also the length of the reciprocating thread 5 on the conduit 202), and the air outlet joint 12 is arranged on the outer surface of the mixing tank 201 near the ending position. When the slider 203 moves from the starting position toward the ending position, the air outlet 4 sprays oxygen, and air is introduced into the port of the mixing tank 201, and the two are mixed. In addition, the gas on the side of the slider 203 away from the mixing tank 201 will also flow through the first through hole 3 to the side close to the port of the mixing tank 201, and impact and mix the gas in this space. Similarly, when the slider 203 moves from the ending position to the starting position, the mixed gas on one side will also pass through the first through hole 3 to flow into the other side of the slider 203, and impact and mix it, effectively reducing the dead angle of gas mixing in the mixing tank 201.

[0032] Of course, the power source for driving any rotating ring 205 to rotate may also be a driving motor and a plurality of gears that cooperate to drive the rotation thereof, but this will also increase the weight of the entire device and occupy space.

[0033] In this embodiment, a circular partition block 9 coaxial with the mixing tank 201 is provided in the mixing tank 201, and the partition block 9 evenly divides the interior of the mixing tank 201 into two first chambers 10 and second chambers 11 of equal volume and not interconnected. All components arranged in the first chamber 10 and the second chamber 11 are mirror-set about the vertical center line of the partition block 9. Of course, two reciprocating threads 5 mirror-set about the partition block 9 are provided on the surface of the conduit 202. The outer surface of the mixing tank 201 is respectively provided with air outlet joints 12 connected to the first chamber 10 and the second chamber 11, wherein the rotating rings 205 fixed at one end of the three guide blocks 204 are all coaxially rotatably arranged on the surface of the partition block 9, and the two sliders 203 in the first chamber 10 and the second chamber 11 move synchronously toward each other.

[0034] As shown in the figure, by dividing the interior of the mixing tank 201 into two first chambers 10 and second chambers 11 of equal volume but not interconnected, the reciprocating stroke of the slider 203 along the length direction of the conduit 202 can be reduced, thereby increasing the disturbance rate of the slider 203 on the gas inside the mixing tank 201.

[0035] In this embodiment, the two side surfaces of each slider 203 opposite to the inner wall of the mixing tank 201 are commonly connected to a telescopic airbag 13 (the telescopic airbag 13 adopts a bellows), and one end of each telescopic airbag 13 is rotatably connected to the surface of the adjacent slider 203, and the other end of the telescopic airbag 13 is fixedly connected to the inner wall of the mixing tank 201, the first through hole 3, the air outlet 4, the conduit 202, the guide block 204 and the stirring blade 6 are all within the coverage range of the corresponding telescopic airbag 13, and the end of each telescopic airbag 13 away from the slider 203 is connected to the second air source.

[0036] As shown in the figure, by providing the telescopic airbag 13, the first chamber 10 and the second chamber 11 can be divided into two chambers with different functions, and air and oxygen are introduced into the telescopic airbag 13. When the slider 203 reciprocates along the length direction of the catheter 202, it will synchronously drive the telescopic airbag 13 to extend or shorten. While the telescopic airbag 13 is deformed, it will also disturb the gas inside it, thereby increasing the mixing uniformity of the air and oxygen inside it.

[0037] In this embodiment, the diameter of each of the first through holes 3 gradually decreases along its axial direction, and the end with the larger diameter faces the adjacent telescopic airbag 13. Each of the first through holes 3 is also provided with a one-way valve 16 that limits the gas to flow only from the larger diameter to the smaller diameter side.

[0038] Combination Figure 6 As shown, the first through hole 3 which gradually changes from large to small can further increase the flow rate of the gas inside the mixing tank 201 when it flows through the first through hole 3, so that the gas with accelerated flow rate can impact other gases, thereby accelerating the mixing uniformity of the gas inside the mixing tank 201; and the setting of the one-way valve 16 can prevent the gas in the mixing tank 201 from entering the telescopic airbag 13 when the slider 203 moves from the direction close to the port of the mixing tank 201 toward the dividing block 9, thereby ensuring the mixing uniformity of air and oxygen in the telescopic airbag 13 and the control of the concentration of the mixed gas.

[0039] In this embodiment, each of the stirring blades 6 is arranged along the radial direction of the conduit 202, and the surface of each stirring blade 6 is provided with a plurality of second through holes 14 arranged at intervals along its length direction. The diameter of each of the second through holes 14 gradually decreases along its axial direction, and when the stirring blade 6 rotates around the conduit 202, the gas in the mixing tank 201 enters from the side of the second through hole 14 with a larger diameter.

[0040] As shown in the figure, when the rotating ring 205 drives each guide block 204 and the stirring blade 6 to rotate, it can not only disturb the gas in the mixing tank 201, but also, when the gas in the mixing tank 201 passes through the axial direction of the second through hole 14, since its diameter changes from large to small, the gas will gradually increase its flow rate when passing through the second through hole 14, and then collide with other gases in the mixing tank 201 when flowing out, thereby achieving the purpose of strengthening the rapid flow of gas inside the mixing tank 201 and uniformly mixing with each other.

[0041] In this embodiment, the diameter of the mixing tank 201 gradually decreases from the middle toward both ends, and the spacing between the two sliders 203 is equal to half the length of the first chamber 10, wherein each of the air outlet holes 4 is arranged near the port of the mixing tank 201, and all the air outlet holes 4 are located within half the length of the corresponding first chamber 10 and second chamber 11.

[0042] As shown in the figure, since the distance between the two sliders 203 is equal to half the length of the first chamber 10 (the second chamber 11 is the same length as the first chamber 10), when the slider 203 of the first chamber 10 moves toward the dividing block 9 and abuts against each other, the other slider 203 just moves to half the length of the second chamber 11 (and vice versa), and each air outlet of the conduit 202 is arranged within half the length of the first chamber 10 and the second chamber 11. At this time, the slider 203 and the telescopic airbag 13 can form a chamber containing air and oxygen for mixing air and oxygen. When the slider 203 in the first chamber 10 moves toward the dividing block 9, due to the setting of the one-way valve 16 on the slider 203, the volume of the chamber formed by the slider 203 and the telescopic airbag 13 becomes larger. However, the mixed gas inside it will not flow out; when the slider 203 in the first chamber 10 moves to abut the partition block 9 and then moves in the opposite direction again, at this time, the slider 203 in the first chamber 10 will squeeze the telescopic airbag 13 and discharge the mixed gas inside it through the first through hole 3 (at this time, the one-way valve 16 in the first through hole 3 is in an open state due to the increased pressure inside the telescopic airbag 13), and the discharged mixed gas enters the first chamber 10 and flows to the designated area through the air outlet connector 12 until the slider 203 moves to half the length of the first chamber 10, and the above movement process is repeated, and the slider 203 in the second chamber 11 also has the same movement process as the slider 203 in the first chamber 10, which can effectively increase the air and oxygen mixing rate while effectively ensuring the concentration of the air-oxygen mixture.

[0043] In this embodiment, the outer surface of the mixing tank 201 is provided with two air outlet connectors 12 connected to the first chamber 10 and the second chamber 11, and the two air outlet connectors 12 are respectively arranged at the two end surfaces close to the partition block 9, and the free end of each of the air outlet connectors 12 is connected to the buffer chamber 15, and a gas concentration sensor is provided in each buffer chamber 15, and the outer surface of each of the buffer chambers 15 is connected to a plurality of connecting hoses for replenishing air and oxygen, and the free ends of the connecting hoses are connected to the first gas source and the second gas source, and a solenoid valve is provided on the passage of each of the connecting hoses (the connecting hoses, the solenoid valves, and the gas concentration sensors are not shown in the figure), and the two buffer chambers 15 are also commonly connected to an air outlet pipe, and the free ends of the air outlet pipes are connected to the external oxygen mask.

[0044] When the mixed gas in the mixing tank 201 flows to the buffer chamber 15, the gas concentration sensor in the buffer chamber 15 detects whether the mixed gas concentration meets the standard. When the mixed gas in one of the buffer chambers 15 does not meet the standard, the connecting hose channel that needs to supplement oxygen or air can be opened by controlling the solenoid valve to supplement the mixing chamber with corresponding oxygen or air, so that the mixed gas inside meets the standard, thereby ensuring the concentration standardization of the mixed gas when it is finally output.

[0045] Working principle of the present invention:

[0046] When it is necessary to mix air and oxygen, the oxygen in the first air source is introduced into the mixing tube through the conduit 202, and the air in the second air source is introduced into the two sealed shells 8. The air and oxygen will enter the two telescopic air bags 13 for mixing, wherein the oxygen will be discharged along the radial direction of the conduit 202 through the air outlet 4 of the conduit 202, and the air after entering the sealed shell 8 will move along the length direction of the conduit 202. The flow paths of the air and oxygen are perpendicular to each other, and the first mixing is achieved; when the air enters the sealed shell 8, it will drive the blade 7 to rotate, and indirectly drive the rotating ring 205, the guide block 204 and the stirring blade 6 to rotate, and the gas in each telescopic air bag 13 will be mixed for the second time, wherein when the stirring blade 6 rotates, the second through hole 14 opened on the surface of each stirring blade 6 can also disturb the gas in the telescopic air bag 13 and accelerate the stirring; and each guide block 204 will drive the slider 20 3 reciprocates on the surface of the conduit 202. When each slider 203 moves toward the dividing block 9, the volume of the telescopic airbag 13 gradually increases and stores more air and oxygen, and stirs and mixes the gas inside it. When the slider 203 moves toward the port of the mixing tank 201, the volume of the telescopic airbag 13 gradually decreases. The mixed gas in the telescopic airbag 13 flows into the first chamber 10 and the second chamber 11 through the first through hole 3 opened on the surface of the slider 203, and the mixed gas will accelerate the flow rate and mix again after passing through the first through hole 3, so as to achieve the third mixing of the gas. The gas in the first chamber 10 and the second chamber 11 will enter the buffer chamber 15 through the gas outlet joint 12, and the gas concentration sensor will detect whether the concentration value reaches the standard, and judge whether it is necessary to supplement oxygen or air. The air-oxygen mixed gas that has reached the standard concentration can flow to the oxygen mask or other designated positions through the gas outlet pipe.

[0047] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An air-oxygen mixer for extracorporeal circulation, comprising a mixer housing (1) and a mixer body (2) arranged inside the mixer housing, characterized in that: The mixer body (2) comprises a mixing tank (201), a conduit (202) arranged inside the mixing tank (201) along the length direction thereof, and a slider (203) slidably penetrated on the outer surface of the conduit (202); the conduit (202), the slider (203) and the mixing tank (201) are coaxially arranged; the peripheral surface of the slider (203) is slidably connected to the inner wall of the mixing tank (201); and both end surfaces of the slider (203) are provided with a plurality of first through holes (3) penetrating each other; one end of the conduit (202) extends out of the mixing tank (201) and is connected to a first gas source for supplying oxygen; and the peripheral surface of the conduit (202) is provided with a plurality of gas outlet holes (4) located inside the mixing tank (201); and the outer surface of the conduit (202) is also provided with a reciprocating thread (5) arranged along the length direction thereof; and the surface of the slider (203) in contact with the conduit (202) cooperates with the reciprocating thread (5); The mixer body (2) further comprises a driving assembly for driving the slider (203) to move, the driving assembly comprising a plurality of guide blocks (204) arranged at intervals in the circumferential direction around the conduit (202) and rotating rings (205) arranged at both ends of the guide blocks (204), the rotating rings (205) being coaxially arranged with the mixing tank (201) and rotatably connected thereto, and both ends of each guide block (204) being fixed to adjacent rotating rings (205), a stirring blade (6) being fixed to the surface of each guide block (204), and the slider (203) being slidably arranged through each guide block (204) and the stirring blade (6), wherein any of the rotating rings (205) is connected to a power source for driving the rotating ring to rotate, one end of the mixing tank (201) is connected to a second air source for supplying air along its length direction, and the outer surface of the mixing tank (201) is connected to an air outlet joint (12) away from this end.

2. An air-oxygen mixer for extracorporeal circulation according to claim 1, characterized in that: The mixing tank (201) is provided with a coaxial partition block (9), and the partition block (9) evenly divides the interior of the mixing tank (201) into two first chambers (10) and second chambers (11) of equal volume. All components arranged in the first chamber (10) and the second chamber (11) are mirror-imaged with respect to the partition block (9), wherein the rotating rings (205) fixed at one end of the plurality of guide blocks (204) are coaxially rotatably arranged on the surface of the partition block (9), and the two sliders (203) in the first chamber (10) and the second chamber (11) move synchronously towards each other.

3. An air-oxygen mixer for extracorporeal circulation according to claim 2, characterized in that: The two side surfaces of each slider (203) opposite to the inner wall of the mixing tank (201) are commonly connected to a telescopic airbag (13), and one end of the telescopic airbag (13) is rotatably connected to the slider (203). The first through hole (3), the conduit (202), the guide block (204) and the stirring blade (6) are all within the coverage range of the corresponding telescopic airbag (13), and one end of each telescopic airbag (13) away from the slider (203) is connected to the second air source.

4. The air-oxygen mixer for extracorporeal circulation according to claim 3, characterized in that: The diameter of each of the first through holes (3) gradually decreases along its axial direction, and the end with the larger diameter faces the adjacent telescopic airbag (13). A one-way valve (16) is also provided in each of the first through holes (3) to limit the gas to flow only from the side with the larger diameter to the side with the smaller diameter.

5. The air-oxygen mixer for extracorporeal circulation according to claim 4, characterized in that: Each of the stirring blades (6) is arranged along the radial direction of the conduit (202), and a plurality of second through holes (14) are provided on the surface of each stirring blade (6) and are arranged at intervals along its length direction. The diameter of each of the second through holes (14) gradually decreases along its axial direction, and when the stirring blade (6) rotates around the conduit (202), air enters the side of the second through hole (14) with a larger diameter.

6. The air-oxygen mixer for extracorporeal circulation according to claim 5, characterized in that: The diameter of the mixing tank (201) gradually decreases from the middle toward both ends, and the distance between the two sliders (203) is greater than or equal to half the length of the first chamber (10), wherein each of the air outlet holes (4) is arranged near the port of the mixing tank (201), and all the air outlet holes (4) are located within half the length of the corresponding first chamber (10) and second chamber (11).

7. An air-oxygen mixer for extracorporeal circulation according to claim 6, characterized in that: The outer surface of the mixing tank (201) is provided with two air outlet joints (12) connected to the first chamber (10) and the second chamber (11), and the two air outlet joints (12) are respectively arranged at the two end surfaces close to the partition block (9), the free end of each of the air outlet joints (12) is connected to a buffer chamber (15), and each buffer chamber (15) is provided with a gas concentration sensor, the outer surface of each buffer chamber (15) is connected to a plurality of connecting hoses for replenishing air and oxygen, and a solenoid valve is provided on the passage of each connecting hose, and the two buffer chambers (15) are also connected to an air outlet pipe, and the free end of the air outlet pipe is connected to an external oxygen mask.

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