Bellows assembly of anesthesia machine and anesthesia machine

Abstract

A bellows assembly (9) of an anesthesia machine and the anesthesia machine, the bellows assembly (9) comprising a shell (91), a silicone rubber folded bag (92) and a connecting seat (93); the shell (91) having a receiving cavity; one end of the silicone rubber folded bag (92) in the height direction is an open end, and the other end of the silicone rubber folded bag (92) in the height direction is a closed end; the silicone rubber folded bag (92) is arranged in the receiving cavity, and a driving gas receiving space is formed between the silicone rubber folded bag (92) and the inner wall of the receiving cavity; the connecting seat (93) comprises a folded bag connecting piece (931); the connecting seat (93) is connected to the shell (91), and the folded bag connecting piece (931) is located in the receiving cavity and is sealed with the open end of the silicone rubber folded bag (92). The bellows assembly (9) of the anesthesia machine and the anesthesia machine adopt a silicone rubber folding bag (92), thereby solving the problems of the folding bag in the related art, such as being easily oxidized and damaged due to aging, and easily absorbing water and expanding. As a result, the silicone rubber folding bag (92) can be used stably for a long time on the anesthesia machine, thereby improving the safety and reliability of the anesthesia machine.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a bellows assembly of an anesthesia machine and an anesthesia machine. Background Art

[0002] Anesthesia machines are primarily used to provide oxygen, anesthesia, and respiratory support to patients during surgery. The respiratory system, as one of the main components of an anesthesia machine, is the combined gas circuit connecting the anesthesia machine and the patient. The respiratory system delivers anesthetic gas mixtures to the patient and receives exhaled gases, enabling gas exchange for both breathing and anesthesia.

[0003] In related technology, one type of anesthesia machine's breathing system uses a bellows to achieve automatic ventilation. When the patient inhales, driving gas enters the bellows and compresses the folded bag inside the bellows, pushing the gas inside the bag through the breathing tube and delivering it to the patient, completing the inhalation process. When the patient exhales, the exhaled gas enters the folded bag through the breathing tube and pushes it up, completing the exhalation process.

[0004] However, after a period of use, the folding bag in the related art will experience problems such as aging, air leakage, unstable operation, and inaccurate air supply, which will greatly affect the safety and reliability of the anesthesia machine. Summary of the Invention

[0005] In view of this, embodiments of the present application hope to provide a bellows assembly of an anesthesia machine and an anesthesia machine that can improve safety and reliability.

[0006] To achieve the above-mentioned object, an embodiment of the present application provides a bellows assembly of an anesthesia machine, comprising:

[0007] a housing having a receiving cavity;

[0008] a silicone rubber folded bladder, wherein one end of the silicone rubber folded bladder along the height direction is an open end, and the other end of the silicone rubber folded bladder along the height direction is a closed end, the silicone rubber folded bladder is disposed in the accommodating cavity, and a driving gas accommodating space is formed between the silicone rubber folded bladder and the inner wall of the accommodating cavity;

[0009] A connecting seat, comprising a folding capsule connecting piece; the connecting seat is connected to the shell, and the folding capsule connecting piece is located in the accommodating cavity and is sealed with the open end of the silicone rubber folding capsule.

[0010] Another embodiment of the present application provides an anesthesia machine, including an air circuit assembly and a bellows assembly, the air circuit assembly including a driving gas branch, a fresh gas branch, a patient inhalation branch, and a patient expiratory branch; the driving gas branch is connected to the bellows assembly to deliver driving gas to the bellows assembly; the fresh gas branch is connected to the patient inhalation branch to deliver fresh gas to the patient end through the patient inhalation branch; the patient inhalation branch is connected to the bellows assembly and the fresh gas branch to receive the fresh gas and output circulating gas to the patient end; the patient expiratory branch is connected to the bellows assembly, and when the patient end exhales, the exhaled gas enters the bellows assembly.

[0011] The bellows assembly and anesthesia machine of the embodiment of the present application can solve the problems of the folding bladder in the related art, such as easy oxidation and aging damage, easy water absorption and expansion, etc., by adopting a silicone rubber folding bladder. As a result, the silicone rubber folding bladder can be used stably on the anesthesia machine for a long time, thereby improving the safety and reliability of the anesthesia machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the automatic ventilation principle of an anesthesia machine with a bellows assembly in the related art. The thick arrows in the figure indicate the flow direction of the driving gas in the bellows assembly and the gas in the folded bag when the patient inhales;

[0013] Figure 2 A schematic diagram of an automatic ventilation principle of an anesthesia machine with a bellows assembly in the related art, wherein the thick arrows in the figure indicate the flow direction of the driving gas in the bellows assembly and the gas in the folded bag when the patient exhales;

[0014] Figure 3 A cross-sectional view of a bellows assembly provided in an embodiment of the present application;

[0015] Figure 4 for Figure 3 Schematic diagram of the structure of the silicone rubber folded bag shown in the figure, the silicone rubber folded bag is in an expanded state;

[0016] Figure 5 for Figure 4 Schematic diagram of the structure of the silicone rubber folded capsule in its natural state;

[0017] Figure 6 for Figure 3 A partial enlarged view of point A in the middle;

[0018] Figure 7 for Figure 3 A schematic diagram of the structure of the top plate shown in ;

[0019] Figure 8 for Figure 3The structural diagram of the top plate ring shown in ;

[0020] Figure 9 Schematic diagram of the shell of the bellows assembly. DETAILED DESCRIPTION

[0021] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0022] In the description of the embodiments of the present application, the directions or positions of "upper", "lower" and "lateral" are based on the attached Figure 3 The orientation or position relationship shown, where "top" is attached Figure 3 The "up" direction and the "bottom" direction are attached Figure 3 The "downward" direction is the "height direction" of the Figure 3 It should be understood that these directional terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application.

[0023] An embodiment of the present application provides a bellows assembly 9 of an anesthesia machine, see Figure 3 The bellows assembly 9 includes a shell 91, a silicone rubber folded bag 92, and a connecting seat 93. The shell 91 has a accommodating cavity, one end of the silicone rubber folded bag 92 along the height direction is an open end, and the other end of the silicone rubber folded bag 92 along the height direction is a closed end. The silicone rubber folded bag 92 is arranged in the accommodating cavity, and a driving gas accommodating space is formed between the silicone rubber folded bag 92 and the inner wall of the accommodating cavity. The connecting seat 93 includes a folded bag connector 931. The connecting seat 93 is connected to the shell 91, and the folded bag connector 931 is located in the accommodating cavity and is sealed with the open end of the silicone rubber folded bag 92.

[0024] In the related art, there is an anesthesia machine with a bellows assembly whose automatic ventilation principle is roughly as follows, please refer to Figure 1 When the patient 1 inhales, the driving gas enters the driving gas storage space between the folded bag 5 and the inner wall of the storage chamber from the driving gas inlet 7. The driving gas compresses the folded bag 5, pushing the gas inside the folded bag 5 along the breathing tube to the absorption tank 4 to remove carbon dioxide. The gas is then mixed with the fresh gas input from the fresh gas input port 8 and delivered to the patient 1 through the inhalation check valve 3. Figure 2When the patient 1 exhales, the gas exhaled by the patient 1 passes through the exhalation one-way valve 2 along the breathing tube and enters the folded bag 5, pushing up the folded bag 5. When the folded bag 5 is expanded to the limit, if there is excess exhaled gas, the excess exhaled gas will be discharged through the burst valve 6. During the entire breathing process, the folded bag 5 recycles the exhaled gas of the patient 1 through the compression and lifting movement. Medical staff can also judge whether there are leaks in the respiratory system and breathing tube or whether the air supply is sufficient by observing the lifting height of the folded bag 5, so as to ensure the normal ventilation needs of the patient 1. In order to meet the movement requirements of compression and lifting of the folding bag 5, the folding bag 5 in the related art is mostly made of natural rubber or neoprene. However, both natural rubber and neoprene have many shortcomings. For example, natural rubber is easily oxidized and aged and damaged. At the same time, some people are allergic to natural rubber. Some regional regulations prohibit the use of natural rubber in the folding bag 5. Neoprene easily absorbs water and swells, and the breathing tube of the anesthesia machine is relatively humid, which can easily cause the folding bag 5 to swell and deform, and then cause unstable operation and air leakage. Once the folding bag 5 has problems such as aging, air leakage, unstable operation, inaccurate air supply, etc., it will affect the normal delivery of the gas in the folding bag 5, and medical staff will not be able to correctly judge whether the respiratory system and breathing tube are leaking or whether the air supply is sufficient. Therefore, it will greatly affect the safety and reliability of the anesthesia machine.

[0025] The bellows assembly 9 of the present application utilizes a silicone rubber pleated capsule 92, which is not easily damaged by oxidation, aging, or water absorption, and does not expand. This allows the silicone rubber pleated capsule 92 to be used stably and for extended periods of time in an anesthesia machine, thereby improving the safety and reliability of the anesthesia machine. Furthermore, due to the superior performance and long service life of the silicone rubber pleated capsule 92, its replacement frequency is much lower than that of natural rubber and neoprene pleated capsules. Therefore, the bellows assembly 9 of the present application can significantly reduce the cost of pleated capsule replacement for users.

[0026] In one embodiment, the silicone rubber accordion bladder 92 has a parting line.

[0027] The natural rubber folding bladder and the neoprene folding bladder in the related art are generally made by the dipping process. Therefore, there is no parting line on the natural rubber folding bladder and the neoprene folding bladder. The silicone rubber folding bladder 92 of the present application can be made by the injection molding process. Therefore, the silicone rubber folding bladder 92 made by the injection molding process has a parting line.

[0028] In addition, it should be noted that for the injection molding process, molding large-area thin-walled parts means quickly filling the entire mold cavity with silicone raw material, which requires a large injection pressure, reasonable flow channel, mold temperature and cooling design, and for large-area non-planar thin-walled parts such as rubber folding bladder 92, to achieve uniform thickness of rubber folding bladder 92, mold processing and assembly are very difficult. This requires uniform mold cavity dimensions and a well-designed demolding method that does not deform the rubber folding bladder 92. Otherwise, the uneven thickness of the rubber folding bladder 92 will inevitably cause the silicone rubber folding bladder 92 to operate unsteadily and even lead to inaccurate control of the patient's inhalation and exhalation during the automatic ventilation control process. Therefore, compared with natural rubber folding bladders and chloroprene folding bladders, silicone folding bladders are more difficult to mold. During the development process of the silicone folding bladder 92 of the present application, in-depth research and demonstration were carried out on the relevant mold design, factors affecting the uniformity of wall thickness during the injection molding process, product shaping after injection molding, and the processing process after secondary vulcanization, which ultimately made the wall thickness of the silicone rubber folding bladder 92 not only controllable to less than 1 mm but also uniform.

[0029] The bellows assembly 9 of this embodiment can be either a rising bellows assembly or a falling bellows assembly. The rising bellows assembly is also called a vertical bellows assembly. The connection base 93 of the rising bellows assembly is located at the bottom of the housing 91. When the patient inhales, the driving gas pushes the silicone rubber folded bladder 92 vertically from top to bottom, thereby compressing the silicone rubber folded bladder 92. When the patient exhales, the exhaled gas pushes the silicone rubber folded bladder 92 vertically from bottom to top, thereby expanding the silicone rubber folded bladder 92. The falling bellows assembly is also called a hanging bellows assembly. The connection base 93 of the falling bellows assembly is located at the top of the housing 91. When the patient inhales, the driving gas pushes the silicone rubber folded bladder 92 vertically from bottom to top, thereby compressing the silicone rubber folded bladder 92. When the patient exhales, the exhaled gas pushes the silicone rubber folded bladder 92 vertically from top to bottom, thereby expanding the silicone rubber folded bladder 92. That is, during the patient's breathing process, the movement direction of the silicone rubber folded bladder 92 in the falling bellows assembly is opposite to that of the silicone rubber folded bladder 92 in the rising bellows assembly. However, for a descending bellows assembly, since the exhaled gas does not need to overcome the weight of the silicone rubber folded bag 92 when the patient exhales and can also move downward by its own weight, if the silicone rubber folded bag 92 moves downward too quickly or the patient does not exhale enough gas, the patient's lungs may generate negative pressure. At the same time, due to the weight of the silicone rubber folded bag 92, even if there is a leak in the respiratory system or breathing tube, the silicone rubber folded bag 92 will move to the bottom, thus making it impossible for medical staff to directly detect the leak in the respiratory system or breathing tube. If the leak problem is not discovered, it will lead to insufficient ventilation of the patient 1, which may cause danger to the patient. Therefore, preferably, the bellows assembly 9 is an ascending bellows assembly.

[0030] In addition, for the rising bellows assembly, during the exhalation process, the gas exhaled by the patient needs to overcome the weight of the silicone rubber folded bag 92 in order to lift the silicone rubber folded bag 92, and the weight of the silicone rubber folded bag 92 is determined by its surface area and wall thickness. Therefore, the wall thickness of the silicone rubber folded bag 92 cannot be too large, otherwise the silicone rubber folded bag 92 will be too heavy and the patient will not be able to completely exhale the gas during the exhalation stage. Therefore, the silicone rubber folded bag 92 with a wall thickness of no more than 1 mm is particularly suitable for use in the rising bellows assembly.

[0031] Furthermore, since the inhalation and exhalation volumes of pediatric patients are much smaller than those of adult patients, the bellows assembly 9 can be divided into an adult bellows assembly and a pediatric bellows assembly. Accordingly, the silicone rubber folding bag 92 in the adult bellows assembly is an adult folding bag, and the silicone rubber folding bag 92 in the pediatric bellows assembly is a pediatric folding bag. The volume of the adult folding bag is not less than 1200 ml, and the volume of the pediatric folding bag is not less than 300 ml. Thus, the different breathing needs of adults and children can be met.

[0032] In one embodiment, the silicone rubber folding capsule 92 includes a sleeve ring 922 and multiple folding rings 921, and the folding capsule connector 931 is a connecting tray. The sleeve ring 922 is arranged at one end of the multiple folding rings 921 close to the connecting tray and is sealed on the outside of the connecting tray.

[0033] Specifically, the difference between the folding ring 921 and the sleeve ring 922 is that when the driving gas compresses the silicone rubber folded bag 92, the folding ring 921 can push the gas in the silicone rubber folded bag 92 into the breathing tube by folding. After the patient's exhaled gas enters the silicone rubber folded bag 92, the silicone rubber folded bag 92 can be lifted by pushing the folding ring 921 to expand. The sleeve ring 922 mainly serves to seal the connection with the connecting tray and cannot be folded or expanded along with the folding ring 921. When installing the silicone rubber folded bag 92, the connecting tray extends into the silicone rubber folded bag 92 through the opening of the sleeve ring 922. The sleeve ring 922 is elastically deformed and sleeved onto the outside of the connecting tray. This ensures the stability and airtightness of the connection between the sleeve ring 922 and the connecting tray.

[0034] In addition, during the breathing process, the maximum stroke of the silicone rubber folded bag 92 up and down cannot be too small. If the stroke is too small, the movement amplitude of the silicone rubber folded bag 92 is not obvious, which makes it inconvenient for medical staff to observe the movement of the silicone rubber folded bag 92. Figure 9As shown, the surface of the housing 91 is typically marked with graduated markings. Medical personnel can use these markings to determine the range of vertical movement of the silicone folded bladder 92 within the housing 91, thereby monitoring the volume of air being ventilated by the anesthesia machine. The vertical movement of the silicone rubber folded bladder 92 is achieved by the expansion and contraction of the folded rings 921. As can be seen, if the number of folded rings 921 is too small, achieving a wide range of expansion and contraction becomes difficult; if the number of folded rings 921 is too large, the structure becomes complex and the cost increases. Therefore, in one embodiment, the number of folded rings 921 for adult bladders is 5 to 10, and the number of folded rings 921 for pediatric bladders is 10 to 20.

[0035] It should be noted that the up-and-down movement of the silicone rubber folded bladder 92 described herein refers to the up-and-down movement of the end of the silicone rubber folded bladder 92 away from the connection seat 93, not the up-and-down movement of the entire silicone rubber folded bladder 92. The folding ring 921 described herein refers to the annular unit of the silicone rubber folded bladder 92 that can fold and unfold, including the ring farthest from the connection seat 93 (also known as the top ring).

[0036] See also Figure 5 In one embodiment, the silicone rubber folding bag 92 is in a natural state, the folding ring 921 is folded, and the height of the sleeve ring 922 is greater than the height of the folded folding ring 921, thereby facilitating the sealing connection between the sleeve ring 922 and the connecting tray.

[0037] It should be noted that the natural state described in the present application refers to the state maintained by the silicone rubber folding bag 92 after the folding ring 921 is folded without the action of external force.

[0038] See also Figure 4 and Figure 5 In one embodiment, the outer diameter of the set ring 922 is smaller than the outer diameter of the folding ring 921. Since the material of silicone rubber is relatively soft, the outer diameter of the set ring 922 is set to be smaller than the outer diameter of the folding ring 921. This can keep the set ring 922 upright to prevent the set ring 922 from loosening and collapsing, which may affect the sealing performance of the connection between the set ring 922 and the connection tray.

[0039] In other embodiments, the outer diameter of the set ring 922 may also be equal to the outer diameter of the folding ring 921 .

[0040] In one embodiment, the silicone rubber folding bladder 92 is an adult folding bladder. The inner diameter of the sleeve ring 922 of the adult folding bladder can be 100 mm to 165 mm, and the outer diameter of the connecting tray that is sealed to the sleeve ring 922 of the adult folding bladder can be 5 mm to 10 mm larger than the inner diameter of the sleeve ring 922 of the adult folding bladder. Optionally, the inner diameter of the sleeve ring 922 of the adult folding bladder is 132 mm, and the outer diameter of the connecting tray is 140 mm.

[0041] In another embodiment, the silicone rubber folding bladder 92 is a pediatric folding bladder. The inner diameter of the pediatric folding bladder's collar 922 can be 38 mm to 100 mm, and the outer diameter of the connecting tray, which is sealed to the pediatric folding bladder's collar 922, can be 2 mm to 6 mm larger than the inner diameter of the pediatric folding bladder's collar 922. Alternatively, the inner diameter of the pediatric folding bladder's collar 922 is 68 mm, and the outer diameter of the connecting tray is 70 mm.

[0042] For the set ring 922 of the embodiment of the present application, when the pressure inside the silicone rubber folded bag 92 reaches 100 cmH2O, it can also ensure good sealing between the set ring 922 and the folded bag tray.

[0043] See also Figure 3 and Figure 6 In one embodiment, the bellows assembly 9 further includes a top plate assembly 94, which is connected to the closed end of the silicone rubber folded bag 92. The top plate assembly 94 can keep the closed end of the silicone rubber folded bag 92 flat, thereby preventing the silicone rubber folded bag 92 from twisting during the up and down movement, thereby affecting the smooth movement of the silicone rubber folded bag 92.

[0044] See also Figure 3 、 Figures 6 to 8 In one specific embodiment, the top plate assembly 94 includes a top plate ring 941 and a top plate 942. At least a portion of the outer edge of the top plate 942 is folded toward one side of the top plate 942 to form a snap-fit ​​edge 942a. The top plate ring 941 is disposed within the silicone rubber folded bladder 92 and has an interference fit with the closed end of the silicone rubber folded bladder 92. The closed end of the silicone rubber folded bladder 92 snaps into the snap-fit ​​edge 942a. In other words, the outer diameter of the top plate ring 941 can be slightly larger than the inner diameter of the closed end of the silicone rubber folded bladder 92. After the top plate ring 941 is inserted into the silicone rubber folded bladder 92, the closed end of the silicone rubber folded bladder 92 can be stretched to maintain a flat surface. Subsequently, the closed end of the silicone rubber folded bladder 92, inserted into the top plate ring 941, is snapped into the snap-fit ​​edge 942a of the top plate 942, thereby further securing the top plate ring 941. This ensures that the closed end of the silicone rubber folded bladder 92 remains flat.

[0045] In other embodiments, the top plate assembly 94 may also have other structural forms. For example, the top plate assembly 94 may only have a top plate ring 941 without a top plate 942, or may only have a top plate 942 without a top plate ring 941. For example, the top plate 942 may directly have an interference fit with the end of the silicone rubber folding sac 92 away from the folding sac connector 931, or the top plate 942 may also be bonded to the end of the silicone rubber folding sac 92 away from the folding sac connector 931, etc., as long as the top plate assembly 94 can play the role of keeping the end of the silicone rubber folding sac 92 away from the folding sac connector 931 flat.

[0046] In one embodiment, the bellows assembly 9 is an adult bellows assembly, the silicone rubber folded bladder 92 is an adult folded bladder, and the diameter of the accommodating cavity is 130 mm to 170 mm. The diameter of the top plate 942 can be 1 mm to 5 mm smaller than the diameter of the accommodating cavity. The outer diameter of the folded ring 921 of the adult folded bladder can be 2 mm to 10 mm smaller than the diameter of the accommodating cavity. This size range ensures that the adult folded bladder can move up and down smoothly in the accommodating cavity, while also ensuring that the gap between the adult folded bladder and the inner wall of the accommodating cavity in the lateral direction of the adult folded bladder is not too large, thereby ensuring the smooth up and down movement of the adult folded bladder.

[0047] In one embodiment, the bellows assembly 9 is a pediatric bellows assembly, the silicone rubber folding bladder 92 is a pediatric folding bladder, and the diameter of the accommodating cavity is 50 mm to 100 mm. The diameter of the top plate can be 1 mm to 5 mm smaller than the diameter of the accommodating cavity. The outer diameter of the folding ring 921 of the pediatric folding bladder can be 2 mm to 8 mm smaller than the diameter of the accommodating cavity. This size range can ensure that the pediatric folding bladder can move up and down smoothly in the accommodating cavity, and can also ensure that the gap between the pediatric folding bladder and the inner wall of the accommodating cavity in the lateral direction of the pediatric folding bladder is not too large, thereby ensuring the smoothness of the up and down movement of the pediatric folding bladder.

[0048] See also Figure 3 and Figure 6 In one embodiment, the bellows assembly 9 further includes a buffer member 95. The buffer member 95 is disposed on the top plate assembly 94, and at least a portion of the structure protrudes from the side of the top plate assembly 94 away from the silicone rubber folded bladder 92. In other words, the buffer member 95 can be disposed on the side of the top plate assembly 94 away from the silicone rubber folded bladder 92, or only a portion of the structure protrudes from the side of the top plate assembly 94 away from the silicone rubber folded bladder 92. When the silicone rubber folded bladder 92 is expanded to the extreme position, the buffer member 95 contacts the inner wall of the outer shell 91, thereby preventing the top plate assembly 94 from colliding with the inner wall of the outer shell 91 and causing abnormal noise, thereby playing a role in buffering and silencing.

[0049] It is understandable that the buffer member 95 is not limited to being provided only on the top plate assembly 94. In other embodiments, the buffer member 95 may also be provided on the inner wall of the accommodating cavity and opposite to the top plate assembly 94, which is equivalent to when the silicone rubber folding bag 92 is unfolded to the extreme position, the top plate assembly 94 contacts the buffer member 95. Alternatively, the buffer member 95 may be provided on both the top plate assembly 94 and the inner wall of the accommodating cavity at the same time, as long as the buffer member 95 can play a role in buffering and silencing.

[0050] See also Figure 3 and Figure 6 In a specific embodiment, the buffer member 95 can be a buffer column. The number of the buffer columns can be one or more. The buffer columns can be set on the top plate assembly 94 or on the inner wall of the accommodating cavity. When the number of the buffer columns is multiple, some of the buffer columns can be set on the top plate assembly 94, and the other part of the buffer columns can be set on the inner wall of the accommodating cavity. For the buffer column set on the top plate assembly 94, when the silicone rubber folded bag 92 is unfolded to the extreme position, the buffer column and the inner wall of the accommodating cavity are in tangential contact. The tangential contact described here can be in various forms. For example, the cross-section of the end of the buffer column that contacts the inner wall of the accommodating cavity can be arc-shaped, triangular, or curved, and the inner wall of the accommodating cavity that contacts the buffer column is flat. Alternatively, a small protrusion with a cross-section of an arc-shaped, triangular, or curved shape is formed on the inner wall of the accommodating cavity that contacts the buffer column. At the same time, the end face of the end of the buffer column that contacts the inner wall of the accommodating cavity is flat. Alternatively, the cross-section of the end of the buffer column that contacts the inner wall of the accommodating cavity can be arc-shaped, triangular, or curved, and a small protrusion with a cross-section of an arc-shaped, triangular, or curved shape is formed on the inner wall of the accommodating cavity that contacts the buffer column. As long as the buffer column and the inner wall of the accommodating cavity are in tangential contact, it is sufficient. The advantage of setting the buffer column and the inner wall of the accommodating cavity in tangential contact is that it can prevent the buffer column and the inner wall of the accommodating cavity from being adsorbed together and affecting the normal movement of the silicone rubber folded bag 92.

[0051] Similarly, when the buffer column is disposed on the inner wall of the accommodating cavity, when the silicone rubber folding bag 92 is unfolded to the extreme position, the buffer column and the top plate assembly 94 may also be in tangential contact in the manner described above.

[0052] Another embodiment of the present application also provides an anesthesia machine, which includes an air circuit assembly and a bellows assembly 9, and the air circuit assembly includes a driving gas branch, a fresh gas branch, a patient inhalation branch, and a patient expiratory branch; the driving gas branch is connected to the bellows assembly 9 to deliver driving gas to the bellows assembly 9; the fresh gas branch is connected to the patient inhalation branch to deliver fresh gas to the patient end through the patient inhalation branch; the patient inhalation branch is connected to the bellows assembly 9 and the fresh gas branch to receive the fresh gas and output circulating gas to the patient end; the patient expiratory branch is connected to the bellows assembly 9, and when the patient end exhales, the exhaled gas enters the bellows assembly 9.

[0053] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An anesthesia machine, comprising an air circuit assembly and a bellows assembly, characterized in that: The gas circuit assembly includes a driving gas branch, a fresh gas branch, a patient inspiration branch, and a patient expiration branch; The driving gas branch is connected to the bellows assembly to deliver driving gas to the bellows assembly; The fresh gas branch is connected to the patient inhalation branch to deliver fresh gas to the patient end through the patient inhalation branch; The patient inhalation branch is connected to the bellows assembly and the fresh gas branch to receive the fresh gas and output the circulating gas to the patient end; The patient exhalation branch is connected to the bellows assembly, and when the patient exhales, the exhaled gas enters the bellows assembly; Wherein, the bellows assembly comprises: A housing having a receiving cavity, a silicone rubber folded bladder, wherein one end of the silicone rubber folded bladder along the height direction is an open end, and the other end of the silicone rubber folded bladder opposite to the open end along the height direction is a closed end; the silicone rubber folded bladder is disposed in the accommodating cavity; the driving gas accommodating space is formed between the inner wall of the accommodating cavity and the silicone rubber folded bladder; the silicone rubber folded bladder is manufactured by an injection molding process, and the wall thickness of the silicone rubber folded bladder is not greater than 1 mm; A connecting seat, comprising a folding capsule connecting piece; the connecting seat is connected to the shell, and the folding capsule connecting piece is located in the accommodating cavity and is sealed with the open end of the silicone rubber folding capsule. 2 . The anesthesia machine according to claim 1 , wherein the silicone rubber folded bag has a parting line.

3. The anesthesia machine according to claim 1 or 2, The silicone rubber folding capsule is an adult folding capsule, and the volume of the adult folding capsule is not less than 1200 ml; or the silicone rubber folding capsule is a pediatric folding capsule, and the volume of the pediatric folding capsule is not less than 300 ml.

4. The anesthesia machine according to claim 1 or 2, wherein the silicone rubber folding bag comprises a sleeve ring and a plurality of folding rings, and the folding bag connecting member is a connecting tray; The sleeve ring is arranged at one end of the plurality of folding rings close to the connection tray and is sealedly sleeved on the outer side of the connection tray.

5. The anesthesia machine according to claim 4, wherein the silicone rubber folding bag is an adult folding bag, and the number of the folding rings of the adult folding bag is 5 to 10; or The silicone rubber folding capsule is a pediatric folding capsule, and the number of the folding rings of the pediatric folding capsule is 10 to 20.

6. The anesthesia machine according to claim 4, wherein the silicone rubber folding bag is in a natural state, the folding ring is folded, and the length of the sleeve ring along the axial direction is greater than the length of the folding ring along the axial direction after folding; and / or the inner diameter of the sleeve ring is less than or equal to the inner diameter of the folding ring.

7. The anesthesia machine according to claim 4, wherein the silicone rubber folding bag is an adult folding bag, and the inner diameter of the sleeve ring of the adult folding bag is 100mm-165mm; and / or the outer diameter of the connecting tray is 5mm-10mm larger than the inner diameter of the sleeve ring; or The silicone rubber folding bladder is a pediatric folding bladder, and the inner diameter of the sleeve ring of the pediatric folding bladder is 38mm-100mm; and / or the outer diameter of the connecting tray is 2mm-6mm larger than the inner diameter of the sleeve ring.

8. The anesthesia machine according to claim 1 or 2, wherein the bellows assembly further comprises a top plate assembly connected to the closed end of the silicone rubber folded bag.

9. The anesthesia machine according to claim 8, wherein the top plate assembly comprises a top plate ring and a top plate, and at least a portion of an outer edge of the top plate is folded toward one side of the top plate to form a snap-fit ​​edge; The top disc ring is arranged in the silicone rubber folding bag and is interference-fitted with the closed end of the silicone rubber folding bag. The closed end of the silicone rubber folding bag is clamped into the clamping edge.

10. The anesthesia machine according to claim 9, wherein the folding bag comprises a plurality of folding rings; The bellows assembly is an adult bellows assembly, the silicone rubber folding bladder is an adult folding bladder, and the diameter of the accommodating cavity is 130mm-170mm; and / or, the diameter of the top plate is 1mm-5mm smaller than the diameter of the accommodating cavity; and / or, the outer diameter of the folding ring of the adult folding bladder is 2mm-10mm smaller than the diameter of the accommodating cavity; or, The bellows assembly is a pediatric bellows assembly, the silicone rubber folding bag is a pediatric folding bag, the diameter of the accommodating cavity is 50mm-100mm; and / or, the diameter of the top plate is 1mm-5mm smaller than the diameter of the accommodating cavity; and / or, the outer diameter of the folding ring of the pediatric folding bag is 2mm-8mm smaller than the diameter of the accommodating cavity.

11. The anesthesia machine according to claim 8, wherein the bellows assembly further comprises a buffer member; The buffer member is disposed on the top plate assembly, and at least a portion of the structure of the buffer member protrudes from a side of the top plate assembly away from the silicone rubber folded bag; and / or, The buffer component is arranged on the inner wall of the accommodating cavity and is arranged opposite to the top plate assembly.

12. The anesthesia machine according to claim 11, wherein the buffer member is a buffer column; The buffer column is arranged on the top plate assembly, and when the silicone rubber folding bag is unfolded to the limit position, the buffer column is in tangential contact with the inner wall of the accommodating cavity; and / or, The buffer column is arranged on the inner wall of the accommodating cavity. When the silicone rubber folding bag is unfolded to the limit position, the buffer column is in tangential contact with the top plate assembly.

13. The anesthesia machine according to claim 1 or 2, wherein the bellows assembly is a rising bellows assembly.

14. A bellows assembly for an anesthesia machine, comprising: a housing having a receiving cavity; a silicone rubber folded bladder, wherein one end of the silicone rubber folded bladder along the height direction is an open end, and the other end of the silicone rubber folded bladder along the height direction is a closed end; the silicone rubber folded bladder is disposed in the accommodating cavity, and a driving gas accommodating space is formed between the silicone rubber folded bladder and the inner wall of the accommodating cavity; the silicone rubber folded bladder is manufactured by an injection molding process, and the wall thickness of the silicone rubber folded bladder is not greater than 1 mm; A connecting seat, comprising a folding capsule connecting piece; the connecting seat is connected to the shell, and the folding capsule connecting piece is located in the accommodating cavity and is sealed with the open end of the silicone rubber folding capsule.

15. The bellows assembly of claim 14, the silicone rubber pleated bladder having a parting line.

16. The bellows assembly according to claim 14 or 15, wherein the silicone rubber folding bag comprises a sleeve ring and a plurality of folding rings, and the folding bag connector is a connecting tray; The sleeve ring is arranged at one end of the plurality of folding rings close to the connection tray and is sealedly sleeved on the outer side of the connection tray.

17. The bellows assembly according to claim 16, wherein the silicone rubber folding bag is in a natural state, the folding ring is folded, and the height of the sleeve ring is greater than the height of the folding ring after folding; and / or the inner diameter of the sleeve ring is less than or equal to the inner diameter of the folding ring.

18. The bellows assembly according to claim 14 or 15, further comprising a top plate assembly connected to the closed end of the silicone rubber folded bag.

19. The bellows assembly according to claim 18, wherein the top plate assembly comprises a top plate ring and a top plate, wherein at least a portion of an outer edge of the top plate is folded toward one side of the top plate to form a snap-fit ​​edge; The top disc ring is arranged in the silicone rubber folding bag and is interference-fitted with the closed end of the silicone rubber folding bag. The closed end of the silicone rubber folding bag is clamped into the clamping edge.

20. The bellows assembly according to claim 18, further comprising a buffer member; The buffer member is arranged on the top plate assembly, and at least a portion of the structure protrudes from a side of the top plate assembly away from the silicone rubber folded bag; and / or, The buffer component is arranged on the inner wall of the accommodating cavity and is arranged opposite to the top plate assembly.

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