Anesthesia machine and gas circuit switching system thereof

Abstract

The present application relates to a kind of medical equipment, specifically disclose a kind of anesthesia machine and its gas path switching system, including shell, slide bar assembly and switching drive device. Wherein, the cavity is formed in shell, for with the breathing port of anesthesia machine communication, the opposite ends of shell are respectively with the automatic ventilation interface and manual ventilation interface of cavity communication;Slide bar assembly is movably worn in cavity, including slide bar and the sealing element connected to slide bar;Switching drive device is used to drive slide bar to move to make sealing element automatic ventilation interface seal or manual ventilation interface seal.The anesthesia machine and its gas path switching system, by the driving of switching drive device can automatically realize the switching of manual ventilation mode and automatic ventilation mode, so as to effectively reduce the operation of doctor when starting self-checking, shorten self-checking time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an anesthesia machine and its gas path switching system. Background Technology

[0002] Anesthesia machines typically include two circuit systems: a mechanical ventilation circuit and a manual ventilation circuit. The manual ventilation circuit is generally used for preoperative induction and as a backup system in case of mechanical ventilation failure. The mechanical ventilation circuit is used to maintain respiratory anesthesia throughout the entire surgical procedure after induction, until the end of the surgery. The BTV (bag-to-ventilation valve) is a two-position, three-way valve in the anesthesia machine system used for switching the ventilation path. It has a mechanically connected handle for switching between manual and automatic ventilation.

[0003] Because the circuit system is relatively complex and involves many sealing points, doctors need to perform a preoperative self-test on the anesthesia machine, including checking the function of each part, leaks, and compliance. The leakage rate (small leaks will cause the self-test to fail; large leaks will cause it to fail) and compliance values ​​from the self-test are used to calculate and compensate for tidal volume during ventilation. Traditional anesthesia machines use a manually controlled switching device. During the startup self-test, doctors need to switch the BTV multiple times to test for leaks in both the mechanical and manual ventilation circuits. The entire self-test process requires doctor supervision and multiple switching between manual and automatic modes to meet different test requirements, making the entire testing process time-consuming and labor-intensive.

[0004] In conclusion, how to effectively solve the problems of time-consuming and labor-intensive self-testing of anesthesia machines is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an anesthesia machine and its gas path switching system, the structural design of which can effectively solve the problem of time-consuming and labor-intensive self-testing of the anesthesia machine.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A gas path switching system for an anesthesia machine, comprising:

[0008] The housing has a cavity formed inside it, which is used to communicate with the breathing port of the anesthesia machine. The two opposite ends of the housing have an automatic ventilation interface and a manual ventilation interface that communicate with the cavity. The automatic ventilation interface is used to connect with the ventilation drive device of the anesthesia machine, and the manual ventilation interface is used to connect with the manual device of the anesthesia machine.

[0009] A slide rod assembly, movably inserted into the cavity, includes a slide rod and a seal connected to the slide rod;

[0010] A switching drive device is used to drive the slide bar to move so that the seal seals the automatic venting port or the manual venting port.

[0011] Optionally, in the above-described gas path switching system, the sealing element includes a first sealing element and a second sealing element connected to both ends of the slide bar, and the switching drive device is used to drive the slide bar to move so that the first sealing element seals the automatic ventilation port or the second sealing element seals the manual ventilation port.

[0012] Optionally, in the above-mentioned gas path switching system, the housing is provided with a mounting through hole, and the switching drive device includes:

[0013] A push rod is movably disposed in the mounting through hole and sealed with the housing. The push rod is connected to the slide rod to drive the slide rod to move.

[0014] A switching drive component is provided, the output end of which is used to push the push rod to move so that the second seal seals the manual ventilation port.

[0015] A push rod elastic element is disposed between the push rod and the housing, and is used to provide a force to push the push rod to reset, so that the first seal seals the automatic venting interface.

[0016] Optionally, in the above-mentioned air path switching system, the moving directions of the push rod and the slide rod are perpendicular, and the push rod and the slide rod are connected by a transmission component, which is used to realize the conversion of movement in two mutually perpendicular directions.

[0017] Optionally, in the above-mentioned air circuit switching system, the transmission component includes a rotating elbow, which includes a first arm and a second arm. One end of the first arm and one end of the second arm are connected and rotatably connected to the housing. The other end of the first arm has a first strip-shaped hole. The push rod is provided with a push rod pin, which is inserted into the first strip-shaped hole. The slide rod is provided with a slide rod pin, which is inserted into the second strip-shaped hole.

[0018] Optionally, in the above-mentioned air circuit switching system, the transmission component includes a guide component slidably installed in the housing and a protrusion connected to the slide rod. The guide component has a guide groove, which is inclined relative to the moving direction of the slide rod. The protrusion is inserted into the guide groove, and the push rod is used to push the guide component to move, so as to drive the slide rod to move accordingly.

[0019] Optionally, in the above-mentioned air path switching system, the moving directions of the push rod and the slide rod are parallel, and the push rod and the slide rod are fixedly connected or are an integral structure.

[0020] Optionally, in the above-mentioned air path switching system, the output end of the switching drive component is connected to a telescopic head, which is used to contact the push rod.

[0021] Optionally, in the above-described airway switching system, the housing is used to be installed in the breathing circuit of the anesthesia machine, and the switching drive component is used to be installed in the circuit interface adapter of the anesthesia machine.

[0022] Optionally, in the above-mentioned gas path switching system, the output end of the switching drive device is fixedly connected to the slide bar to drive the slide bar to reciprocate.

[0023] The gas path switching system for an anesthesia machine provided by this invention includes a housing, a slide rod assembly, and a switching drive device. The housing contains a cavity that communicates with the anesthesia machine's air inlet. The housing has an automatic ventilation interface and a manual ventilation interface, respectively, communicating with the cavity at opposite ends. The automatic ventilation interface connects to the anesthesia machine's ventilation drive device, and the manual ventilation interface connects to the anesthesia machine's manual control device. The slide rod assembly is movably inserted into the cavity and includes a slide rod and a seal connected to the slide rod. The switching drive device drives the slide rod to move so that the seal seals either the automatic ventilation interface or the manual ventilation interface.

[0024] The gas path switching system for an anesthesia machine provided by this invention uses a switching drive device to move a sliding rod. As the sliding rod moves, the seal can seal the automatic ventilation interface, connecting the cavity to the manual ventilation interface. This connects the manual ventilation interface with the breathing port, forming a manual ventilation circuit, and the gas path switching system is in manual ventilation mode. When the sliding rod moves to the point where the seal seals the manual ventilation interface, the cavity connects to the automatic ventilation interface, connecting the automatic ventilation interface with the breathing port, forming an automatic ventilation circuit, and the gas path switching system is in automatic ventilation mode. This gas path switching system, driven by the switching drive device, can automatically switch between manual and automatic ventilation modes. Therefore, it can effectively reduce doctor operations and shorten self-test time during startup self-test, forming the basis for fully automated self-test. This switching device does not require an exposed handle, making the circuit layout more flexible.

[0025] The present invention also provides an anesthesia machine comprising any of the above-described gas path switching systems. Since the gas path switching systems described above have the aforementioned technical effects, the anesthesia machine having such a gas path switching system should also have the corresponding technical effects. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a gas switching system applied to an anesthesia machine.

[0028] Figure 2 This is a schematic diagram of the gas path switching system according to the first specific embodiment of the present invention;

[0029] Figure 3 for Figure 2 A schematic diagram of the first working state of the gas path switching system;

[0030] Figure 4 for Figure 2 A schematic diagram of the second working state of the gas path switching system;

[0031] Figure 5 for Figure 3 Corresponding front view diagram of the internal structure;

[0032] Figure 6 for Figure 5 A three-dimensional schematic diagram;

[0033] Figure 7 for Figure 4 Corresponding front view diagram of the internal structure;

[0034] Figure 8 for Figure 7 A three-dimensional schematic diagram;

[0035] Figure 9 This is a schematic diagram of the gas path switching system according to the second specific embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of the gas path switching system according to the third specific embodiment of the present invention.

[0037] The following labels are shown in the attached diagram:

[0038] Gas circuit switching system 100, control circuit board 200, switching switch 300, ventilation drive device 400, manual device 500, breathing circuit 600, exhalation valve 700, gas isolation device 800, circuit interface adapter 610.

[0039] Driving air 01, breathing air 02, exhaust air 03;

[0040] Housing 110, cavity 111, automatic venting port 112, manual venting port 113, mounting through hole 114, interface sealing ring 115, interface pressure plate 116;

[0041] Slide rod assembly 120, slide rod 121, seal 122, first seal 1221, second seal 1222, slide rod pin 1211, protrusion 1212;

[0042] The switching drive device 130, push rod 131, switching drive component 132, push rod elastic element 133, push rod pin 1311, sealing gasket 134, elastic rod 135, pre-compression spring 136, piston rod 1321, and piston return elastic element 1322 are included.

[0043] Transmission component 140, rotating elbow 141, first support arm 1411, second support arm 1412, first strip hole 1413, second strip hole 1414; guide component 142, guide groove 1421, rotating shaft 143. Detailed Implementation

[0044] This invention discloses an anesthesia machine and its gas path switching system, which effectively reduces the doctor's operation during the self-test of the anesthesia machine, shortens the self-test time, and improves the self-test efficiency.

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The gas path switching system provided by this invention is used in anesthesia machines. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of a gas switching system applied to an anesthesia machine. The gas switching system 100 allows for switching between automatic and manual ventilation. The gas switching system 100 is electrically connected to a control circuit board 200, which in turn is electrically connected to a switch 300. The control circuit board 200 controls the gas switching system 100's actions based on whether the switch 300 is in the automatic or manual position. The switch 300, acting as a signal input switch operated by the physician, only needs to provide position signals and does not require a mechanical physical connection to the gas switching system 100.

[0047] During automatic mechanical ventilation, the process is as follows: During inhalation, the driving air 01 generated by the ventilation drive device 400 (such as a ventilation engine) pushes the respiratory air 02 forward into the breathing circuit 600, eventually entering the patient's lungs. The breathing circuit 600 may specifically include inspiratory and expiratory flow sensors, a one-way valve, and a soda lime container. During exhalation, the patient's lungs contract, and the respiratory air 02 pushes the driving air 01 from the previous cycle backward through the expiratory valve 700 as waste gas 03. Because fresh gas continuously flows into the expiratory circuit throughout the process, replenishing oxygen and anesthetic gas, a portion of the respiratory air 02 also overflows from the expiratory valve 700 as waste gas 03 at the end of exhalation. During manual ventilation, the doctor presses the bag valve to force inspiratory and expiratory air into the patient's lungs to maintain respiration. Besides preoperative anesthesia induction, the manual mode also serves as a safety backup in case of mechanical ventilation failure.

[0048] Please see Figure 2 , Figure 2 This is a schematic diagram of the gas path switching system according to the first specific embodiment of the present invention.

[0049] In one embodiment, the gas path switching system of the anesthesia machine provided by the present invention includes a housing 110, a slide rod assembly 120, and a switching drive device 130. A cavity 111 is formed within the housing 110, which communicates with the breathing port of the anesthesia machine. The shape of the housing 110 can be set as needed, and is not specified here. To facilitate the installation of the components within the housing 110, the housing 110 can be a split structure connected by conventional fixing methods. The housing 110 has an automatic ventilation interface 112 and a manual ventilation interface 113, respectively, communicating with the cavity 111. The automatic ventilation interface 112 is used to connect to the ventilation drive device 400 of the anesthesia machine, such as connecting to a ventilation engine, specifically through a gas isolation device 800 for driver exhalation connected to the ventilation engine. The manual ventilation interface 113 is used to connect to the manual device 500 of the anesthesia machine, such as connecting to a manual ventilation bladder, and can also connect to an APL valve (pressure reducing valve). The slide rod assembly 120 is movably disposed within the cavity 111 and includes a slide rod 121 and a seal 122 connected to the slide rod 121. The switching drive device 130 is used to drive the slide rod 121 to move so that the seal 122 seals the automatic vent 112 or the manual vent 113.

[0050] The gas path switching system of the anesthesia machine provided by this invention uses a switching drive device 130 to drive a slide bar 121 to move. As the slide bar 121 moves, the sealing element 122 seals the automatic ventilation interface 112, connecting the cavity 111 to the manual ventilation interface 113. This connects the manual ventilation interface 113 to the breathing port, forming a manual ventilation circuit, and the gas path switching system is in manual ventilation mode. When the slide bar 121 moves to the point where the sealing element 122 seals the manual ventilation interface 113, the cavity 111 connects to the automatic ventilation interface 112, connecting the automatic ventilation interface 112 to the breathing port, forming an automatic ventilation circuit, and the gas path switching system is in automatic ventilation mode. This gas path switching system, driven by the switching drive device 130, can automatically switch between manual and automatic ventilation modes, thus effectively reducing doctor operations and shortening self-test time during startup self-testing, forming the basis for fully automated self-testing. This switching device does not require an exposed handle, making the circuit layout more flexible.

[0051] In the installation state, the automatic ventilation interface 112 and the manual ventilation interface 113 can be installed horizontally. Compared with traditional gas circuit switching systems, where the handle is connected to the internal switching valve core, the overall circuit layout is restricted, resulting in many anesthesia circuits having an unreasonable layout, affecting condensate management and increasing gas resistance due to the smoothness of the gas circuit. The appearance layout and the gas circuit layout influence and restrict each other, requiring trade-offs. The gas circuit switching valve provided by this invention, with the automatic ventilation interface 112 and the manual ventilation interface 113 arranged horizontally, is beneficial for condensate management. With no height difference, condensate can flow smoothly to the designated location, avoiding accumulation that affects ventilation.

[0052] In addition, the switching drive device 130 can be controlled by electrical signals, enabling automatic switching of the gas path and reducing the need for doctor intervention during self-examination. Furthermore, the switching switch 300 and the switching drive device 130 may not be physically connected; the switching of the switching drive device 130 can be achieved through a pneumatic-electric control method. Therefore, the switching drive device 130 can be placed in a reasonable position according to the optimal layout requirements of the circuit, making the entire circuit more compact.

[0053] The automatic ventilation interface 112 is connected to the ventilation drive device 400, specifically through a pipeline. An interface sealing ring 115 and an interface pressure plate 116 can be provided on the outer circumference of the automatic ventilation interface 112 to ensure a sealed connection with the pipeline. Similarly, an interface sealing ring 115 and an interface pressure plate 116 can be provided on the outer circumference of the manual ventilation interface 113 to connect to the manual device 500 through a sealed connection with the pipeline.

[0054] In one embodiment, the seal 122 includes a first seal 1221 and a second seal 1222 respectively connected to both ends of the slide bar 121. The switching drive device 130 is used to drive the slide bar 121 to move so that the first seal 1221 seals the automatic vent 112 or the second seal 1222 seals the manual vent 113. It is understood that when the second seal 1222 seals the manual vent 113, as... Figure 3 , Figure 5 and Figure 6 As shown, the first seal 1221 naturally moves away from the automatic ventilation port 112, thus maintaining the automatic ventilation port 112 in communication with the cavity 111, thereby communicating with the breathing port. Similarly, the first seal 1221 and the second seal 1222 move with the slide rod 121, so when the first seal 1221 seals the automatic ventilation port 112, as... Figure 4 , Figure 7 and Figure 8 As shown, the second seal 1222 naturally disengages from the manual ventilation port 113, thus maintaining communication between the manual ventilation port 113 and the cavity 111, thereby connecting it to the breathing port. By providing the first seal 1221 and the second seal 1222, the slide bar 121 can switch between automatic and manual ventilation modes by moving a small distance. In other embodiments, only one seal 122 can be provided to seal both the automatic ventilation port 112 and the manual ventilation port 113, resulting in a longer travel distance for the slide bar 121.

[0055] The first sealing element 1221 and the second sealing element 1222 can be a sealing sheet, a sealing ring or other form of sealing structure fixed on the slide rod 121, respectively.

[0056] In one embodiment, please refer to... Figure 2The housing 110 has a mounting through hole 114. The switching drive device 130 includes a push rod 131, a push rod elastic element 133, and a switching drive component 132. The push rod 131 is movably disposed within the mounting through hole 114 and sealed to the housing 110. The push rod 131 is connected to a slide rod 121 to drive the slide rod 121 to move. The output end of the switching drive component 132 is used to push the push rod 131 to move, so that the second sealing element 1222 seals the manual venting interface 113. The push rod elastic element 133 is disposed between the push rod 131 and the housing 110, and is used to provide a force to push the push rod 131 to reset, so that the first sealing element 1221 seals the automatic venting interface 112. Therefore, when switching to automatic ventilation mode is required, the output end of the switching drive component 132 acts on the push rod 131, pushing the push rod 131 to move, so that the second seal 1222 seals the manual ventilation interface 113, thereby connecting the automatic ventilation interface 112 with the cavity 111, and the push rod elastic element 133 deforms when the push rod 131 moves. When switching to manual ventilation mode is required, the switching drive component 132 retracts, and the push rod 131 springs back under the action of the push rod elastic element 133, thereby driving the slide rod 121 to reset accordingly, so that the first seal 1221 seals the automatic ventilation interface 112, thereby connecting the cavity 111 with the manual interface, and the manual ventilation side is connected to the circuit system. Through the above settings, when the automatic ventilation fails due to machine power failure, the air circuit can automatically revert to manual ventilation mode, as a safety risk mitigation measure, improving the safety of the air circuit switching system. The push rod elastic element 133 can be a compression spring, and a retaining ring can be fixed on the push rod 131 to abut against one end of the push rod elastic element 133, while the other end of the push rod elastic element 133 abuts against the housing 100.

[0057] Specifically, a sealing gasket 134 is provided between the push rod 131 and the housing 110. The push rod 131 and the sealing gasket 134 form a sliding seal, while the sealing gasket 134 and the housing 110 form a static seal. The housing 110 has a placement groove, and the sealing gasket 134 is placed in the groove, with its outer circumferential surface forming a contact seal with the side wall of the groove. A through hole is formed in the center of the sealing gasket 134, through which the push rod 131 passes, forming a sliding seal with the sealing gasket 134. The seal between the push rod 131 and the housing 110 prevents the cavity 111 from communicating with the outside through the gap between the push rod 131 and the housing 110. Depending on the needs, other sealing methods such as sealing rings or labyrinth seals can also be used between the push rod 131 and the housing 110.

[0058] In one embodiment, the moving directions of the push rod 131 and the slide rod 121 are perpendicular, and the push rod 131 and the slide rod 121 are connected by a transmission member 140, which is used to switch between moving in two mutually perpendicular directions. The perpendicular arrangement of the push rod 131 and the slide rod 121, and the 90-degree deflection of their movement direction via the transmission member 140, effectively enables switching between manual and automatic ventilation modes. Furthermore, the perpendicular arrangement of the moving directions of the push rod 131 and the slide rod 121 makes it well-suited for anesthesia machines where the breathing circuit 600 system can be disassembled vertically.

[0059] Further, please refer to Figure 2 The transmission component 140 includes a rotating elbow 141, which includes a first arm 1411 and a second arm 1412. One end of the first arm 1411 and one end of the second arm 1412 are connected and rotatably connected to the housing 110. The other end of the first arm 1411 is provided with a first strip hole 1413. The push rod 131 is provided with a push rod pin 1311, which is inserted into the first strip hole 1413. The slide rod 121 is provided with a slide rod pin 1211, which is inserted into the second strip hole 1414. By configuring the elbow 141, on the one hand, the push rod 131 can push the elbow 141 to rotate around the pivot 143 rotatably connected to the housing 110; on the other hand, since the first arm 1411 and the second arm 1412 are respectively provided with a first slotted hole 1413 and a second slotted hole 1414, the push rod pin 1311 can both push the elbow 141 to rotate and slide along the first slotted hole 1413. The rotation of the elbow 141 pushes the slide rod 121 to move in a direction perpendicular to the movement of the push rod 131, while the second slotted hole 1414 moves relative to the slide rod pin 1211. When the switching drive component 132 drives the push rod 131 to move, the push rod elastic element 133 deforms, and the elbow 141 deflects simultaneously, as... Figure 5 and Figure 6 The clockwise rotation causes the elbow 141 to push the slide bar 121 to slide to the left, thereby sealing the manual vent 113 with the second seal 1222. When the switching drive component 132 retracts, the push rod 131 resets under the restoring force of the push rod elastic element 133, correspondingly causing the elbow 141 to rotate in the opposite direction, as shown. Figure 7 and Figure 8 The device deflects counterclockwise and pushes the slide bar 121 to slide to the right, sealing the first seal 1221 with the automatic vent 112. With this configuration, the push rod 131 and slide bar 121 can only move in their respective directions of motion; for example, the push rod 131 moves vertically, and the slide bar 121 moves horizontally, thus the rotating elbow 141 can only rotate accordingly. This transmission component 140 has a simple structure and reliable transmission.

[0060] In one embodiment, see Figure 9In this embodiment, the transmission component 140 adopts a different configuration than that in the previous embodiment. Specifically, the transmission component 140 includes a guide component 142 slidably mounted within the housing 110 and a protrusion 1212 connected to the slide rod 121. The guide component 142 has a guide groove 1421, which is inclined relative to the moving direction of the slide rod 121. The protrusion 1212 is inserted into the guide groove 1421. The push rod 131 is used to push the guide component 142 to move, thereby causing the slide rod 121 to move accordingly. It should be noted that the length and inclination angle of the guide groove 1421 can be set according to the stroke requirements of the slide rod 121, and are not specifically limited here. Through the cooperation of the guide groove 1421 and the protrusion 1212, the movement of the guide component 142 with the push rod 131 is converted into the movement of the slide rod 121 perpendicular to it, such as converting the vertical movement of the guide component 142 with the push rod 131 into the horizontal movement of the slide rod 121. When the switching drive component 132 drives the push rod 131 to move, the push rod elastic element 133 deforms, and the push rod 131 pushes the guide element 142 to slide. Since the guide element 142 has an inclined guide groove 1421, the protrusion 1212 slides accordingly along the guide groove 1421. That is, the guide element 142 pushes the slide rod 121 to move and slide, causing the second sealing element 1222 to seal the manual venting interface 113. When the switching drive component 132 retracts, the push rod 131 resets under the restoring force of the push rod elastic element 133, and correspondingly drives the guide element 142 to move in the opposite direction. Thus, through the cooperation of the guide groove 1421 and the protrusion 1212, the slide rod 121 slides in the opposite direction, sealing the first sealing element 1221 with the automatic venting interface 112. With the above configuration, the push rod 131 and the slide rod 121 can only move in their respective directions of motion, such as the push rod 131 moving in the vertical direction and the slide rod 121 moving in the horizontal direction. The transmission component 140 has a simple structure and reliable transmission.

[0061] In one embodiment, the moving directions of the push rod 131 and the slide rod 121 are parallel, and the push rod 131 and the slide rod 121 are fixedly connected or are an integral structure. The parallel arrangement of the push rod 131 and the slide rod 121 eliminates the need for the transmission component 140 to deflect the movement direction by 90 degrees, effectively enabling switching between manual and automatic ventilation modes. Furthermore, the parallel moving directions of the push rod 131 and the slide rod 121 are well-suited for anesthesia machines where the breathing circuit 600 system can be disassembled horizontally. Because the moving directions of the push rod 131 and the slide rod 121 are parallel, they can be an integral structure or directly or indirectly fixedly connected, allowing for synchronous movement and a simpler structure.

[0062] In one embodiment, the switching drive component 132 can be a telescopic cylinder such as a pneumatic cylinder or a hydraulic cylinder, or other drive devices such as an electromagnet or a voice coil motor, depending on the requirements. When the switching drive component 132 uses a pneumatic cylinder, it can specifically be a single-acting pneumatic cylinder, with one end of the piston rod 1321 serving as its output end, and a piston return elastic element 1322 is provided in cooperation with the piston rod 1321. The pneumatic cylinder pushes the push rod 131 to move, and the push rod 131 drives the slide rod 121 to move accordingly, so that the second seal 1222 seals the manual venting port 113. When the pneumatic cylinder releases air and retracts, the push rod 131 resets under the action of the push rod elastic element 133, and drives the slide rod 121 to reset accordingly, so that the first seal 1221 seals the automatic venting port 112.

[0063] In one embodiment, the output end of the switching drive component 132 is connected to a telescopic head, which is used to contact the push rod 131. By providing the telescopic head, dimensional and positional deviations during the engagement of the components can be absorbed. Specifically, the telescopic head includes an elastic rod 135 and a pre-compression spring 136 disposed between the elastic rod 135 and the output end of the switching drive component 132, such as a cylinder. The pre-compression spring 136 also ensures that the elastic rod 135 has a set initial thrust to provide sufficient thrust to push the push rod 131 and thus achieve ventilation mode switching. In other embodiments, the telescopic head may also employ other telescopic structures.

[0064] In one embodiment, the housing 110 is used to install on the breathing circuit 600 of the anesthesia machine, and the switching drive component 132 is used to install on the circuit interface adapter 610 of the anesthesia machine. That is, the switching drive component 132, the housing 110, and the components inside the housing 110 are separate structures. The housing 110 can be disassembled along with the entire breathing circuit 600 for cleaning and disinfection, while the switching drive component 132 does not require disinfection and can be fixedly connected to the circuit interface adapter 610.

[0065] In one embodiment, see Figure 10 , Figure 10 This is a schematic diagram of the air path switching system according to the third specific embodiment of the present invention. The output end of the switching drive device 130 is fixedly connected to the slide rod 121 to drive the slide rod 121 to move back and forth. That is, the switching drive device 130 can directly drive the slide rod 121 to move, such as by using a telescopic cylinder to directly push the slide rod 121 to move. Figure 10 The middle cavity 111 is connected to the breathing circuit 600 through the lower end interface.

[0066] Based on the gas path switching system provided in the above embodiments, the present invention also provides an anesthesia machine, which includes any one of the gas path switching systems in the above embodiments. Since this anesthesia machine uses the gas path switching system in the above embodiments, the beneficial effects of this anesthesia machine are explained in the above embodiments.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas path switching system for an anesthesia machine, characterized in that, include: The housing has a cavity formed inside it, which is used to communicate with the breathing port of the anesthesia machine. The two opposite ends of the housing have an automatic ventilation interface and a manual ventilation interface that communicate with the cavity. The automatic ventilation interface is used to connect to the ventilation drive device of the anesthesia machine, and the manual ventilation interface is used to connect to the manual device of the anesthesia machine. Both the automatic ventilation interface and the manual ventilation interface are arranged horizontally and at the same height. A slide rod assembly, movably inserted into the cavity, includes a slide rod and a sealing element connected to the slide rod, the sealing element including a first sealing element and a second sealing element respectively connected to both ends of the slide rod; A switching drive device is used to drive the slide bar to move so that the seal seals the automatic venting port or the manual venting port; The housing has a mounting through hole, and the switching drive device includes: A push rod is movably disposed in the mounting through hole and sealed with the housing. The push rod is connected to the slide rod to drive the slide rod to move. A switching drive component is provided, the output end of which is used to push the push rod to move so that the second seal seals the manual ventilation port. A push rod elastic element is disposed between the push rod and the housing, which is used to provide a force to push the push rod to reset so that the first sealing element seals the automatic ventilation interface. When the automatic ventilation of the anesthesia machine fails due to power failure, the airway can automatically return to the manual ventilation mode. The top rod and the slide rod are arranged perpendicular to each other in their direction of movement. The top rod and the slide rod are connected by a transmission component, which is used to realize the conversion between movement in two mutually perpendicular directions. The transmission component includes a rotating elbow, which includes a first arm and a second arm. One end of the first arm and one end of the second arm are connected and rotatably connected to the housing. The other end of the first arm has a first slotted hole, and the second arm has a second slotted hole. The push rod has a push rod pin inserted into the first slotted hole, and the slide rod has a slide rod pin inserted into the second slotted hole. The switching drive device is used to drive the slide bar to move so that the first seal seals the automatic venting port or the second seal seals the manual venting port.

2. The gas path switching system of the anesthesia machine according to claim 1, characterized in that, The output end of the switching drive component is connected to a telescopic head, which is used to contact the top rod.

3. The gas path switching system of the anesthesia machine according to any one of claims 1-2, characterized in that, The housing is used to be installed in the breathing circuit of the anesthesia machine, and the switching drive component is used to be installed in the circuit interface adapter of the anesthesia machine.

4. The gas path switching system of the anesthesia machine according to claim 1, characterized in that, The output end of the switching drive device is fixedly connected to the slide bar to drive the slide bar to reciprocate.

5. An anesthesia machine, characterized in that, Includes the gas path switching system as described in any one of claims 1-4.

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