CONNECTOR AND SEAL USED THEREFOR AND ANESTHESIA MACHINE USING THE CONNECTOR

Abstract

The present utility model relates to a connector, a seal used therefor, and an anesthesia machine using the connector. The connector comprises first and second connection ports detachably communicating with an input port and an output port of an absorber canister respectively, and a seal. The seal comprises an annular ring and at least one lip. The annular ring is positioned on an inner sidewall of at least one connection port of the first and second connection ports. The at least one lip is annular and extends from an inner side of the annular ring in a direction away from the annular ring. When the absorber canister is in communication with the connector, a lower surface of the at least one lip of the seal contacts an outer sidewall of at least one port of the input port and the output port to form an annular contact surface, the width of the annular contact surface being greater than the thickness of a root portion of the at least one lip. The above technical solution reduces the resistance incurred when the absorber canister is inserted into the seal. The technical solution also enables the seal to have a longer service life and a good dynamic sealing performance.

Claims

1. A connector for connecting with an absorber canister, the connector comprising: a first connection port for detachably communicating with an input port of the absorber canister; a second connection port for detachably communicating with an output port of the absorber canister; and a seal, the seal being disposed on an inner sidewall of at least one connection port of the first connection port and the second connection port, and the seal comprising: an annular ring positioned on the inner sidewall of the at least one connection port; and at least one lip, the at least one lip being annular and extending from an inner side of the annular ring in a direction away from the annular ring, wherein when the absorber canister is in communication with the connector, a lower surface of the at least one lip of the seal contacts an outer sidewall of at least one port of the input port and the output port to form an annular contact surface, the width of the annular contact surface being greater than the thickness of a root portion of the at least one lip.

2. The connector according to claim 1, wherein the width of the annular contact surface is between 120% and 200% of the thickness of the root portion of the at least one lip.

3. The connector according to claim 2, wherein the width of the annular contact surface is between 140% and 180% of the thickness of the root portion of the at least one lip.

4. The connector according to claim 3, wherein the width of the annular contact surface is about 160% of the thickness of the root portion of the at least one lip.

5. The connector according to claim 1, wherein the at least one lip is made of a resilient material and the thickness of the at least one lip tapers from the root portion to an end portion.

6. The connector according to claim 1, wherein the seal comprises only one lip, and the one lip is disposed near a middle portion in a height direction of the annular ring.

7. The connector according to claim 1, wherein the seal comprises a plurality of lips, and the plurality of lips are distributed in a height direction of the annular ring.

8. A connector for connecting with an absorber canister, comprising: a first connection port for detachably communicating with an input port of the absorber canister; a second connection port for detachably communicating with an output port of the absorber canister; and a seal, the seal being sleeved on a sidewall of at least one connection port of the first connection port and the second connection port, and the seal comprising: an annular ring positioned on an outer sidewall of the at least one connection port; a guide chamfer portion, the guide chamfer portion being annular and extending obliquely from a bottom of the annular ring towards an interior of the at least one connection port; and a lip, the lip being annular and extending from an end portion of the guide chamfer portion in a direction towards or away from the annular ring, wherein an annular hollow portion is formed between the annular ring and the guide chamfer portion, and the sidewall of the at least one connection port is positioned in the hollow portion.

9. The connector according to claim 8, wherein the seal further comprises a bend, the bend extending substantially in a radial direction inwards from a top portion of the annular ring.

10. The connector according to claim 8, wherein the lip extends from the end portion of the guide chamfer portion in a direction away from the annular ring.

11. The connector according to claim 10, wherein an included angle between the annular ring and the guide chamfer portion is in a range of 30-45 degrees.

12. The connector according to claim 10, wherein, when the absorber canister is in communication with the connector, a lower surface of the lip contacts an outer sidewall of at least one port of the input port and the output port to form an annular contact surface, the width of the annular contact surface being greater than the thickness of a root portion of the lip.

13. The connector according to claim 12, wherein the width of the annular contact surface is between 120% and 200% of the thickness of the root portion of the lip.

14. The connector according to claim 12, wherein the lip is made of a resilient material, and the thickness of the lip tapers from the root portion to the end portion.

15. The connector according to claim 8, wherein the lip extends from the end portion of the guide chamfer portion in a direction towards the annular ring.

16. The connector according to claim 15, wherein an included angle between the annular ring and the guide chamfer portion is in a range of 45-60 degrees.

17. An anesthesia machine, comprising: an absorber canister having an input port and an output port; and a connector according to claim 1.

18. The anesthesia machine according to claim 17, wherein the anesthesia machine further comprises a base, the base comprising: a lifting frame disposed below the absorber canister; and a cam disposed below the lifting frame, wherein the lifting frame is lifted or lowered by rotating the cam, thereby inserting the input port and the output port of the absorber canister into the first and second connection ports of the connector, or withdrawing the input port and the output port of the absorber canister from the first and second connection ports of the connector.

19. The anesthesia machine according to claim 17, wherein the lifting frame and the absorber canister are detachable.

20. A sealing ring, wherein the sealing ring is the seal used in the connector according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present utility model can be better understood by describing exemplary embodiments of the present utility model with reference to accompanying drawing. In all the accompanying drawings, the same reference numerals are used to indicate the same or similar components, where:

[0028] FIG. 1 is a schematic cross-sectional view of a bypass of a breathing circuit of an anesthesia machine in a non-communicating state according to an embodiment of the present utility model;

[0029] FIG. 2 is a schematic cross-sectional view of a bypass circuit of a breathing circuit of an anesthesia machine in a communicating state according to an embodiment of the present utility model;

[0030] FIG. 3 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to an embodiment of the present utility model;

[0031] FIG. 4 is a cross-sectional view of a lip-shaped seal according to an embodiment of the present utility model;

[0032] FIG. 5 is a partial enlarged view of a part of a lip of a lip-shaped seal closely attaching to an outer sidewall of a port of an absorber canister according to an embodiment of the present utility model;

[0033] FIG. 6 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to another embodiment of the present utility model;

[0034] FIG. 7 is a cross-sectional view of a lip-shaped seal having a hollow portion according to another embodiment of the present utility model;

[0035] FIG. 8 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to still another embodiment of the present utility model;

[0036] FIG. 9 is a cross-sectional view of a lip-shaped seal having a hollow portion according to still another embodiment of the present utility model; and

[0037] FIG. 10 is a partial enlarged view of a lip-shaped seal having a hollow portion pressing against an outer sidewall of a port of an absorber canister according to still another embodiment of the present utility model.

LIST OF REFERENCE NUMERALS

[0038]

TABLE-US-00001 10 Bypass of a breathing circuit of an anesthesia machine 20 Base 22 Base main body 24 Lifting frame 26 Cam 110 Connector 111 Gas inlet 112 Gas outlet 114 First and second connection ports 116 First and second seals 116a Annular ring 116b Lip 116c Guide chamfer portion 116d Hollow portion 116e Junction of a lip and a guide chamfer portion 116f Bend 116r Annular contact surface 117 End cover 117a Guide chamfer member 118 First and second gas valves 119 Valve cover 120 Absorber canister 121 Input port of the absorber canister 122 Output port of the absorber canister A Deformation direction of the seal W Width of the annular contact surface T Thickness of the root portion of the lip

DETAILED DESCRIPTION

[0039] The specific implementation manners of the present utility model will be described below. It should be pointed out that, in order to provide a concise description in the specific description process of these implementation manners, it is impossible for this description to describe all features of the actual implementation manners in detail. It should be understood that in the actual implementation of any of the implementation manners, as in the process of any engineering project or design project, a variety of specific decisions are often made in order to achieve the developer's specific objectives and meet system-related or business-related restrictions, which will vary from one implementation manner to another. In addition, it should also be understood that although efforts made in this development process may be complicated and lengthy, for those of ordinary skill in the art related to the content disclosed in the present utility model, some changes in design, manufacturing, or production based on the technical content disclosed in the present disclosure are only conventional technical means and should not be understood as that content of the present disclosure is insufficient.

[0040] Unless otherwise defined, the technical or scientific terms used in the claims and the description are as they are usually understood by those of ordinary skill in the art to which the present utility model pertains. The words first, second and similar words used in the description and claims of the patent application of the present utility model do not denote any order, quantity, or importance, but are merely intended to distinguish between different constituents. One, a and similar words are not meant to be limiting, but rather denote the presence of at least one. The word include, comprise or a similar word is intended to mean that an element or article that appears before include or comprise encompasses an element or article and equivalent elements that are listed after include or comprise, and does not exclude other elements or articles. The word connect, connected or a similar word is not limited to a physical or mechanical connection, and is not limited to a direct or indirect connection.

[0041] FIG. 1 is a schematic cross-sectional view of a bypass of a breathing circuit of an anesthesia machine in a non-communicating state according to an embodiment of the present utility model. As shown in FIG. 1, the bypass 10 of the breathing circuit of the anesthesia machine may include a connector 110 and an absorber canister 120. The connector 110 may include a gas inlet 111, a gas outlet 112, first and second connection ports 114, and first and second gas valves 118. The first and second connection ports 114 are substantially sleeve-shaped, each have a through hole in the middle, and are provided with first and second seals 116 on their sidewalls, respectively. The first and second connection ports 114 each have one end that can communicate with the gas inlet 111 or the gas outlet 112 and the other end being open to allow an input port 121 and an output port 122 of the absorber canister 120 to be inserted thereinto, respectively. The first and second connection ports 114 are also substantially coaxial with the first and second gas valves 118, respectively. The first and second gas valves 118 each have a valve cover 119.

[0042] The absorber canister 120 is used for containing soda lime, and has the input port 121 and the output port 122. The absorber canister may be detachably connected to the connector 110 by its input port 121 and output port 122 being inserted into or withdrawn from the first and second connection ports 114. The absorber canister 120 may also be detachably mounted on a base 20.

[0043] The base 20 may include a base main body 22, a lifting frame 24, and a cam 26. The cam 26 can be fixed on the base main body 22 and is rotatable about a rotation axis.

[0044] In this embodiment, as shown in FIG. 1, an operator rotates the cam 26 clockwise about the rotation axis, and the lifting frame 24 and the absorber canister 120 mounted on the lifting frame 24 are lowered accordingly. Accordingly, the input port 121 and the output port 122 of the absorber canister 120 are withdrawn from the first and second connection ports 114, so that the connector 110 and the absorber canister 120 are in a non-communicating state. At this time, the operator can detach the absorber canister 120 from the base 20 to replace the absorber canister with a new one.

[0045] At the same time, since the input port 121 and the output port 122 of the absorber canister 120 are withdrawn from the first and second connection ports 114, the valve covers 119 on the first and second gas valves 118 are respectively lowered to just block passages between the connector and the main body of the breathing circuit of the anesthesia machine respectively, thus preventing CO.sub.2 gas in the main body of the breathing circuit of the anesthesia machine from leaking into an operating room when the absorber canister 120 is replaced.

[0046] FIG. 2 is a schematic cross-sectional view of a bypass of a breathing circuit of an anesthesia machine in a communicating state according to an embodiment of the present utility model. Similar to the structure illustrated in FIG. 1, the bypass 10 of the breathing circuit of the anesthesia machine may include a connector 110 and an absorber canister 120. When an operator rotates a cam 26 counterclockwise, a lifting frame 24 and the absorber canister 120 mounted on the lifting frame 24 are lifted accordingly. Accordingly, an input port 121 and an output port 122 of the absorber canister 120 are inserted into first and second connection ports 114, respectively. First and second seals 116 positioned on sidewalls of the first and second connection ports 114 seal gas flow between the first and second connection ports 114 and the input/output ports 121 and 122 of the absorber canister, respectively, thus avoiding gas in the connector 110 from leaking into the operating room during an operation.

[0047] At the same time, since the input port 121 and the output port 122 of the absorber canister 120 are inserted into the first and second connection ports 114 respectively, valve covers 119 on the first and second gas valves 118 are pushed upwards respectively, so that passages between the connector and a main body of the breathing circuit of the anesthesia machine are opened, and the main body of the breathing circuit of the anesthesia machine and the absorber canister 120 are in a communicating state. In the communicating state, carbon dioxide exhaled by a patient enters from the gas inlet 111 of the connector 110, passes through the first connection port 114, and enters the absorber canister 120 through the input port 121 of the absorber canister 120. In the absorber canister 120, the carbon dioxide and soda lime chemically react to produce water, heat, and a mixed gas containing CaCO.sub.3, Na.sub.2CO.sub.3, and the like. The heavier water sinks to the bottom of the absorber canister 120, and the mixed gas generated by the reaction passes through the output port 122 of the absorber canister 120, enters the connector 110 through the second connection port 114, and then is discharged from the gas outlet 112.

[0048] In some embodiments, as shown in FIG. 1 and FIG. 2, the absorber canister 120 has the input port 121 and the output port 122 that are disposed separately from each other. The carbon dioxide gas exhaled by the patient enters the absorber canister 120 through the input port 121, chemically reacts with the soda lime (mainly composed of calcium hydroxide and sodium hydroxide) contained in the absorber canister 120, and at the same time releases water and heat. The mixed gas generated by the reaction is discharged from the absorber canister 120 through the output port 122. In other embodiments, the input port and the output port of the absorber canister may be disposed in a coaxial nested structure, or the input port is disposed inside the output port, or the output port is disposed inside the input port. In this case, the first and second connection ports of the connector 110 may also be disposed in a coaxial nesting structure to adapt to the coaxially disposed input port and output port.

[0049] In some embodiments, as shown in FIG. 1 and FIG. 2, seals 116 may be disposed on sidewalls of the first and second connection ports 114 so as to obtain an effective sealing between the input port 121 and output port 12 of the absorber canister 120 and the first and second connection ports 114 of the connector 110. In some implementation manners, the seal 116 may be a sealing ring.

[0050] Specific implementation manners of the seal 116 will be described below with reference to FIG. 3 to FIG. 10.

First Embodiment

[0051] FIG. 3 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to an embodiment of the present utility model. Similar to that shown in FIG. 1 and FIG. 2, in this embodiment, the connector 110 includes a gas inlet 111, a gas outlet 112, first and second connection ports 114, and first and second gas valves 118. The first and second connection ports 114 are substantially sleeve-shaped, each have a through hole in the middle, and are provided with first and second seals 116 on their inner sidewalls, respectively. One end of the first connection port 114 on the left side can communicate with the gas inlet 111, and one end of the first connection port 114 on the right side can communicate with the gas outlet 112. The other ends of the two connection ports are open, respectively allowing the input port 121 and the output port 122 of the absorber canister 120 to be inserted thereinto from bottom to top. As shown in FIG. 3, in this embodiment, the first and second seals 116 may be lip-shaped seals. In some implementation manners, the first and second seals 116 adopt single-lip seals. The single-lip seal has a simple structure, uses less material, and is easy to manufacture and form. Moreover, the single-lip seal 116 can be directly attached to an inner sidewall of the connection port 114, which takes up very little space and is easy to replace. In some other implementation manners, the first and second seals 116 may be seals with two or more lips.

[0052] After the lip-shaped seal 116 is placed in the connection port 114, an end cover 117 can be rotated to limit the lip-shaped seal 116 in the connection port 114. In some implementation manners, a guide chamfer member 117a may be further disposed on the end cover 117, for guiding the input port 121 and the input port 122 of the absorber canister 120 into the first and second seals 116, respectively. The guide chamfer member 117a may be a component separate from the end cover 117, or may be integrally formed with the end cover 117.

[0053] FIG. 4 is a cross-sectional view of a lip-shaped seal according to an embodiment of the present utility model. In this embodiment, as shown in FIG. 4, the lip-shaped seal 116 is a single-lip seal. The lip-shaped seal 116 includes an annular ring 116a and a lip 116b. The annular ring 116a has a certain height. After mounting, an outer sidewall of the annular ring 116a fits an inner sidewall of the connection port 114. The lip 116b is also annular, and extends from an inner side of the annular ring 116a in a direction away from the annular ring, for example, extends substantially inwards in a radial direction. In some implementation manners, the lip 116b may be disposed near a middle portion in a height direction of the annular ring. In some other implementation manners, the lip 116b may be disposed at a position below the middle portion in the height direction of the annular ring.

[0054] In this embodiment, the inner diameter of the lip 116b may be set to be smaller than the diameter of an outer sidewall of the input port or output port of the absorber canister. In some implementation manners, the lip-shaped seal 116 may be made of a resilient material such as silicone rubber. The resilience of the lip 116b enables the input port 121 and the output port 122 of the absorber canister 120 to receive less resistance when inserted into the first and second connection ports 114, respectively. In some other implementation manners, the lip-shaped seal 116 may be made of a high temperature-resistant resilient material.

[0055] In some implementation manners, the lip 116b may be set to have a uniform thickness in the height direction of the annular ring 116a. In some other implementation manners, the lip 116b may be set to have a greater thickness at the root portion than that at the end portion. For example, the thickness of the lip 116b tapers as a distance from the inner side of the annular ring 116a increases. The tapered thickness of the lip 116b enables the lip to be more easily deformed. When the input port 121 and the output port 122 of the absorber canister 120 are inserted into the first and second connection ports 114, respectively, the resistances received by them will be smaller; therefore, the lip 116b can be easily pushed upwards during the insertion, so that a part of a lower surface of the lip 116b is closely attached to the outer sidewall of the input port or output port of the absorber canister.

[0056] FIG. 5 is a partial enlarged view of a part of a lip of a lip-shaped seal closely attaching to an outer sidewall of a port of an absorber canister according to an embodiment of the present utility model. When the input/output port 121 and 122 of the absorber canister is inserted into the corresponding connection port 114 upwards from a bottom side, since the inner diameter of the lip 116b is smaller than the diameter of outer sidewall of the input/output port 121 and 122 of the absorber canister, the input/output port 121 and 122 of the absorber canister will push the lip 116b upwards, and a part of a lower surface of the resilient lip 116b will be naturally attached to the outer sidewall of the input/output port 121 and 122. As shown in FIG. 5, when the gas pressure inside a breathing circuit is gradually increased, an upper surface of the lip 116b is not only subjected to the gas pressure from top to bottom, but also subjected to the gas pressure from left to right. The gas pressure from left to right presses the lip 116b tightly against the outer sidewall of the input/output port 121 and 122 of the absorber canister, forming a very good sealing. A greater gas pressure will result in a better sealing performance. At the same time, even if the lower surface of the lip 116b is worn due to repeated detaching of the absorber canister, under the effect of the gas pressure, the lip 116b can still be closely attached to the outer sidewall of the input/output port of the absorber canister. Therefore, the lip-shaped seal has the self-compensation ability and a long service life.

[0057] In this embodiment, a portion where the lower surface of the lip 116b contacts the outer sidewall of the input/output port of the absorber canister forms an annular contact surface 116r. In some implementation manners, the width W of the annular contact surface 116r is greater than the thickness T of the root portion of the lip 116b. The lip 116b having a larger annular contact area can obtain a better sealing effect. In some implementation manners, the width W of the annular contact surface may be set to be between 120% and 200% of the thickness T of the root portion of the lip. In some other implementation manners, the width W of the annular contact surface may be set to be between 140% and 180% of the thickness T of the root portion of the lip. In still other implementation manners, the width W of the annular contact surface may be set to be about 160% of the thickness T of the root portion of the lip.

[0058] When the input/output ports 121 and 122 of the absorber canister are inserted into the corresponding first and second connection ports 114 upwards from the bottom side or are withdrawn therefrom, an end portion of the lip 116b can sweep away a part of powder accumulated on the outer sidewalls of the input/output ports of the absorber canister, thus reducing the frictional resistances received by the input/output ports of the absorber canister when inserted into the first and second connection ports, and improving dynamic sealing of the seal in the breathing circuit of the anesthesia machine.

[0059] In a preferred implementation manner of the lip-shaped seal 116, the lip-shaped seal 116 may include only one lip 116b, which is disposed near a middle portion in a height direction of an annular ring 116a, and extends substantially in a radial direction towards an interior of the annular ring. The lip 116b is made of a resilient material, and during use, a lower surface thereof contacts the input/output port of the absorber canister to form an annular contact surface 116r. The width W of the annular contact surface 116r is greater than the thickness T of the root portion of the lip 116r. For example, the width W of the annular contact surface is between 120% and 200% of the thickness T of the root portion of the lip. The single-lip seal constructed as such has a soft lip and is easy to deform. When the input/output port 121 and 122 of the absorber canister is inserted into the lip-shaped seal 116, the resistance (including frictional resistance) applied by the lip 116b to the input/output port of the absorber canister is minimal, and the sealing performance is very good. According to tests, the single-lip seal is sufficient to meet requirements on resistance and sealing.

[0060] In other implementation manners, the lip-shaped seal 116 may be a lip-shaped seal with two or more lips. The two or more lips may be distributed in the height direction of the annular ring as needed. In some implementation manners, each of the two or more lips has a uniform thickness. The two or more lips may have the same or different thicknesses. In some other implementation manners, at least one of the two or more lips has a greater thickness at the root portion than that at the end portion. For example, the thickness of at least one lip tapers as a distance from the inner side of the annular ring 116a increases.

Second Embodiment

[0061] FIG. 6 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to another embodiment of the present utility model. Similar to the structure shown in FIG. 3, in this embodiment, the connector 110 includes a gas inlet 111, a gas outlet 112, first and second connection ports 114, and first and second gas valves 118. The first and second connection ports 114 are substantially sleeve-shaped, each have a through hole in the middle, and are provided with first and second seals 116 on their sidewalls, respectively. One end of the first connection port 114 on the left side can communicate with the gas inlet 111, and one end of the first connection port 114 on the right side can communicate with the gas outlet 112. The other ends of the two connection ports are open, respectively allowing the input port 121 and the output port 122 of the absorber canister 120 to be inserted thereinto from bottom to top. As shown in FIG. 6, in this embodiment, the first and second seals 116 are also lip-shaped seals, but their shapes and mounting manners are different from those of the lip-shaped seals in the first embodiment shown in FIG. 3.

[0062] FIG. 7 is a cross-sectional view of a lip-shaped seal having a hollow portion according to another embodiment of the present utility model. In this embodiment, the lip-shaped seal 116 may be a single-lip seal, or may be a seal with two or more lips. Different from the first embodiment, the lip-shaped seal 116 of this embodiment may also include a guide chamfer portion 116c and a bend 116f in addition to the annular ring 116a and the lip 116b. The guide chamfer portion 116c may be disposed between the annular ring 116a and the lip 116b, and the bend 116f may be disposed at the top portion of the annular ring 116a. The guide chamfer portion 116c and the bend 116f may be integrally formed with the annular ring 116a and the lip 116b. In some implementation manners, the guide chamfer portion 116c is also annular, and extends obliquely inwards and upwards from the bottom of an inner side of the annular ring 116a. The lip 116b extends continuously from an end portion of the guide chamfer portion 116c in a direction away from the annular ring, for example, extends substantially inwards in a radial direction. The bend 116f extends from the top of the annular ring 116a in a direction away from the annular ring 116a, for example, extends substantially inwards in the radial direction. As shown in FIG. 7, an included angle is formed between the annular ring 116a and the guide chamfer portion 116c. After mounting, at least a part of inner sidewalls of the annular ring 116a and the bend 116f fits the outer sidewall of the connection port 114. The connection port 114 is positioned in a hollow portion 116d enclosed by the bend 116f, the annular ring 116a, the guide chamfer portion 116c, and the lip 116b. In some implementation manners, the included angle between the annular ring 116a and the guide chamfer portion 116c is in a range of 30-45 degrees.

[0063] In some implementation manners, the lip 116b may be disposed near a middle portion in a height direction of the annular ring. In some other implementation manners, the lip 116b may be disposed at a position below the middle portion in the height direction of the annular ring.

[0064] In this embodiment, the lip 116b may be set to have the same features as the lip 116b of the first embodiment, thereby having similar performance advantages. In addition, compared with the lip-shaped seal of the first embodiment, the guide chamfer portion 116c of the lip-shaped seal 116 of this embodiment can also guide the input/output port of the absorber canister to the lip 116b of the lip-shaped seal 116 when the input/output port of the absorber canister is inserted into the corresponding connection port 114, so that the guide chamfer portion 117a in the first embodiment shown in FIG. 3 can be omitted.

Third Embodiment

[0065] FIG. 8 is a schematic cross-sectional view of a connector in a breathing circuit of an anesthesia machine according to still another embodiment of the present utility model. Similar to the structure shown in FIG. 6, in this embodiment, the connector 110 includes a gas inlet 111, a gas outlet 112, first and second connection ports 114, and first and second gas valves 118. The first and second connection ports 114 are substantially sleeve-shaped, each have a through hole in the middle, and are provided with first and second seals 116 on sidewalls, respectively. One end of the first connection port 114 on the left side can communicate with the gas inlet 111, and one end of the first connection port 114 on the right side can communicate with the gas outlet 112. The other ends of the two connection ports are open, respectively allowing the input port 121 and the output port 122 of the absorber canister 120 to be inserted thereinto from bottom to top. As shown in FIG. 8, in this embodiment, the first and second seals 116 are lip-shaped seals having a hollow portion, and the shape thereof is slightly different from that of the lip-shaped seal in the second embodiment shown in FIG. 6.

[0066] FIG. 9 is a cross-sectional view of a lip-shaped seal having a hollow portion according to still another embodiment of the present utility model. In this embodiment, the lip-shaped hollow seal 116 includes an annular ring 116a, a lip 116b, a guide chamfer portion 116c, and a bend 116f. The guide chamfer portion 116c may be disposed between the annular ring 116a and the lip 116b, and the bend 116f may be disposed at the top portion of the annular ring 116a. The guide chamfer portion 116c and the bend 116f may be integrally formed with the annular ring 116a and the lip 116b. In some implementation manners, the guide chamfer portion 116c is also annular, and extends obliquely inwards and upwards from the bottom of an inner side of the annular ring 116a. The lip 116b extends from an end portion of the guide chamfer portion 116c in a direction towards the annular ring 116a. The bend 116f extends from the top of the annular ring 116a in a direction away from the annular ring 116a, for example, extends substantially inwards in a radial direction. As shown in FIG. 9, an included angle is formed between the annular ring 116a and the guide chamfer portion 116c. After mounting, at least a part of inner sidewalls of the annular ring 116a and the bend 116f fits the outer sidewall of the connection port 114. The connection port 114 is positioned in a hollow portion 116d enclosed by the bend 116f, the annular ring 116a, the guide chamfer portion 116c, and the lip 116b. In some implementation manners, the included angle between the annular ring 116a and the guide chamfer portion 116c is in a range of 45-60 degrees. In some implementation manners, a junction 116e of the lip 116b and the guide chamfer portion 116c may be disposed near a middle portion in a height direction of the annular ring. In some other implementation manners, the junction 116e of the lip 116b and the guide chamfer portion 116c may be disposed at a position below the middle portion in the height direction of the annular ring.

[0067] In this embodiment, the junction 116e of the lip 116b and the guide chamfer portion 116c may be set to have a minimum inner diameter, and the minimum inner diameter is smaller than the diameter of the outer sidewall of the input/output port of the absorber canister. The lip-shaped seal 116 may be made of a resilient material the same as or similar to that in the first or second embodiment.

[0068] FIG. 10 is a partial enlarged view of a lip-shaped seal with a hollow portion pressing against an outer sidewall of a port of an absorber canister according to still another embodiment of the present utility model. Similar to the case shown in FIG. 5, when the gas pressure inside a breathing circuit is gradually increased, gas in a hollow portion 116d applies a pressure to an inner surface of a guide chamfer portion 116c. The pressure and a hollow stable structure of the lip-shaped hollow seal 116 enable a junction of a lip 11b and a guide chamfer portion 116c to tightly press against an outer sidewall of an input/output port of the absorber canister, thus forming a very good sealing. A greater gas pressure will result in a better sealing performance. A smaller minimum inner diameter at the junction of the lip 11b and the guide chamfer portion 116c compared with the outer diameter of the port of the absorber canister will result in a better sealing performance. At the same time, even if the junction of the lip 116b and the guide chamfer portion 116c is worn due to repeated detaching of the absorber canister, the resilience of the hollow structure can still enable the junction to press against the outer sidewall of the input/output port of the absorber canister. Therefore, the lip-shaped hollow seal has the self-compensation ability and a long service life.

[0069] The lip-shaped hollow seal 116 has a hollow structure so that the seal has a larger resilient range in the radial direction. In one aspect, when the input/output port of the absorber canister is inserted into the corresponding first and second connection ports 114 upwards from a bottom side, the hollow structure makes it easier for the seal 116 to be compressed in an A direction, and therefore, the resistance received by the input/output port of the absorber canister will be smaller. In another aspect, after insertion, the resilience of the hollow structure allows the junction 116e of the lip 116b and the guide chamfer portion 116c to press tightly against the outer sidewall of the input/output port of the absorber canister to implement a good sealing. In yet another aspect, even if the resilience of the hollow structure is deteriorated due to long-term use, when the outer sidewall of the input/output port of the absorber canister presses the seal outwards in a radial direction so that the lip 116b is pressed against an inner sidewall of the connection port 114, the inner sidewall of the connection port 114 will prevent the seal 116 from further deforming, and at the same time apply the same reaction force to the outer sidewall of the input/output port of the absorber canister, thus ensuring a good sealing performance.

[0070] In this embodiment, only the junction of the lip 116b and the guide chamfer portion 116c is in contact with the outer sidewall of the input/output port of the absorber canister, and the contact area is small. Therefore, when the input/output ports of the absorber canister are inserted into the corresponding first and second connection ports upwards from the bottom side, the frictional resistances received by the input/output ports of the absorber canister are smaller. In addition, similar to the guide chamfer portion in the second embodiment, the guide chamfer portion 116d of this embodiment can guide the input/output port 121 and 122 of the absorber canister to the junction with the lip 116b when the input/output port 121 and 122 of the absorber canister is inserted into the corresponding connection port 114, so that the guide chamfer member 117a in the first embodiment shown in FIG. 3 can be omitted.

[0071] Some exemplary embodiments have been described above. However, it should be understood that various modifications can be made. For example, if the described techniques are performed in a different order and/or if the components of the described system, architecture, device, or circuit are combined in other manners and/or replaced or supplemented with additional components or equivalents thereof, a suitable result can be achieved. Accordingly, other implementation manners also fall within the protection scope of the claims.