WO2020125242A1

WO2020125242A1 - External carbon dioxide absorption device

Info

Publication number: WO2020125242A1
Application number: PCT/CN2019/115585
Authority: WO
Inventors: 高宏; 沈宁; 黑子清; 黄东晓
Original assignee: 无锡圣诺亚科技有限公司
Priority date: 2018-12-17
Filing date: 2019-11-05
Publication date: 2020-06-25
Also published as: CN109395227A

Abstract

Disclosed is an external carbon dioxide absorption device, comprising an inhalation tube interface (5) capable of connecting to an inhalation interface of an anesthesia machine, and connecting to an exhalation interface of the anesthesia machine by means of an absorber second interface (7), so as to improve ease of connection to the anesthesia machine and to reduce the cost of matching a connection. Gas exhaled into an exhalation tube (3) via a respiration interface (1) can be absorbed by a carbon dioxide absorber before entering the anesthesia machine, thereby achieving effective absorption of carbon dioxide during respiratory support. The carbon dioxide absorber is internally provided with a carbon dioxide absorbent (10, 14) in the form of granules or rolls to realize carbon dioxide absorption. The gas from an inhalation tube (2) can be filtered via an inhalation tube filter (6), and the gas from the exhalation tube (3) can be filtered by an exhalation tube filter (8), so as to improve the convenience and reliability of use and to reduce the risk of cross contamination.

Description

External carbon dioxide absorption device

Technical field

The invention relates to a breathing circuit, especially an external carbon dioxide absorption device, which belongs to the technical field of breathing management of anesthesia machine.

Background technique

At present, the anesthesia machine adopts a closed loop mode during mechanical ventilation. The exhaled gas (containing a mixed gas of carbon dioxide, mainly oxygen, or containing anesthetic gas) in the breathing circuit of the anesthesia machine enters the breathing circuit again after absorbing the carbon dioxide gas through the carbon dioxide absorption tank Use. The working principle of the carbon dioxide absorption tank is that the carbon dioxide absorbent contained therein reacts with carbon dioxide to realize the absorption of carbon dioxide.

When the exhaled gas in the breathing circuit of the anesthesia machine is absorbed by the carbon dioxide absorption tank, the exhaled gas in the breathing circuit of the anesthesia machine enters the carbon dioxide absorption tank through the gas inlet pipe, and the gas absorbed by the carbon dioxide absorption tank returns again through the gas outlet pipe Into the breathing circuit of the anesthesia machine.

At present, the carbon dioxide absorption tanks of all anesthesia machine manufacturers are designed in the middle of the anesthesia machine breathing circuit, and are collectively referred to as built-in carbon dioxide absorption tanks. In order to install more carbon dioxide absorbents in the carbon dioxide absorption tanks and reduce the number of absorbent replacements, the carbon dioxide absorption tanks The caliber is large, and it is difficult to ensure the tightness of the connection between the carbon dioxide absorption tank and the anesthesia machine. In order to improve the tightness, the interface connection between the carbon dioxide absorption tank and the anesthesia machine designed by different anesthesia machine manufacturers is more complicated, resulting in various connections on the market There are large differences in interfaces, with dozens of types, which are difficult to match.

At the same time, after connecting the carbon dioxide absorption tank to the anesthesia machine, it can only realize the absorption of carbon dioxide and has a single function. Due to the complicated interface between the CO2 absorption tank and the anesthesia machine, the original CO2 absorption tank cost is high, and the patient is basically not replaced during general anesthesia. Only the carbon dioxide absorbent is replaced. The clinical CO2 absorption tank has been used continuously for a long time. Until the tank is broken or the anesthesia machine is scrapped, the use period is up to several decades, resulting in a large cross-infection risk for the anesthesia machine for general anesthesia patients during respiratory support.

However, the built-in carbon dioxide absorption tank needs to be matched with the original carbon dioxide tank opening of various anesthesia machines, and the research and development cost is extremely high. The structure of the tank mouth of different anesthesia machines is complicated. In order to ensure the sealing of the product assembly, the product structure is complex and the tank body cost is high. At the same time, each type of original tank has a large cross-sectional area. In order to ensure the carbon dioxide absorption effect, the carbon dioxide particles need to be loaded with a large weight. If one person and one tank are used, the waste is large and the cost is extremely high. This is contrary to the current reduction in clinical medical expenses, it is difficult to promote one-person, one-pot use in clinical practice, and it is difficult to completely eliminate the hidden danger of cross-infection.

In order to reduce the cost of research and development, reduce production costs, and truly realize the clinical one-person-one-pot one-time use promotion, the proposed conversion interface design scheme, but its implementation is more difficult, failed to obtain clinical conversion. Therefore, there is an urgent clinical need for a low-cost disposable carbon dioxide absorption device.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings in the prior art, to provide an external carbon dioxide absorption device, which has a compact structure, can be easily connected with the anesthesia machine, and realize the absorption of carbon dioxide during the breathing support process, improving the convenience of use With reliability, reduce the risk of cross infection.

According to the technical solution provided by the present invention, the external carbon dioxide absorption device includes a carbon dioxide absorber that can absorb carbon dioxide gas in the exhaled gas of a patient under general anesthesia. The carbon dioxide absorber includes a carbon dioxide absorber and a carbon dioxide absorber Carbon dioxide absorption cavity; the carbon dioxide absorption cavity is straight or curved, and the carbon dioxide absorbent is in the form of loose particles or loose rolls; the effective circulation cross-sectional area of the gas in the carbon dioxide absorption body is greater than 40 mm ² ; Two ends of the absorption cavity are respectively connected to the first connection port of the absorption body and the second connection port of the absorption body; the carbon dioxide absorption body is sealedly connected to the anesthesia breathing line through the first connection port of the absorption body; the second connection port of the absorption body The inner diameter of 22mm±0.5mm, the carbon dioxide absorber can be adapted to the exhalation interface of the anesthesia machine through the second connection port of the absorber and sealed connection; the exhaled gas of patients under general anesthesia enters the carbon dioxide absorber through the first connection port of the absorber, The gas that enters the carbon dioxide absorber is absorbed by the carbon dioxide absorber and enters the breathing circuit in the anesthesia machine through the second connection port of the absorber.

When the carbon dioxide absorbent is in a loose roll shape, the carbon dioxide absorbent layer is pressed into a carbon dioxide absorption layer by pressing the muddy carbon dioxide absorbent, and the carbon dioxide absorption layer is wound into a roll shape and dried to form a desired roll carbon dioxide absorption Agent.

When the carbon dioxide absorbent is in the form of a loose roll, the carbon dioxide absorbent includes a carbon dioxide absorbent layer and a water-absorbing and breathable layer adapted to the carbon dioxide absorbent layer; the muddy carbon dioxide absorbent is compressed into a carbon dioxide absorbent layer and absorbs carbon dioxide The layer and the water-absorbent gas-permeable layer are combined and wound into a roll shape, and after drying, the required roll-shaped carbon dioxide absorbent can be formed.

The water-absorbing and breathable layer includes a gas-permeable supporting layer and a plurality of water-absorbing bodies disposed on the gas-permeable supporting layer; the air-permeable supporting layer includes a sponge, and the water-absorbing body includes a water-absorbing resin.

The carbon dioxide absorber is also provided with a water storage tank, and the water storage tank is located below the carbon dioxide absorbent.

The carbon dioxide absorber is connected to the exhalation connecting pipe of the anesthesia breathing circuit through the first connection port of the absorber, and the exhalation connecting pipe is connected to the breathing interface of the anesthesia breathing circuit; the breathing interface is also connected to the inhalation connecting pipe of the anesthesia breathing circuit The connection can be adapted to the suction interface of the anesthesia machine through the suction connecting tube and sealed.

The inhalation connecting pipe and exhalation connecting pipe include bellows; the length of the inhalation connecting pipe is greater than that of the exhalation connecting pipe, and the length of the inhaling connecting pipe is equal to the sum of the lengths of the corresponding exhalation connecting pipe and carbon dioxide absorber Consistent.

An exhalation connecting tube filter is provided in the carbon dioxide absorption body, and the exhalation connecting tube filter is adjacent to the second connection port of the absorption body.

A failure indicator for indicating the absorption state of the carbon dioxide gas is also provided in the carbon dioxide absorber, and the failure indicator is adjacent to the second connection port of the absorber.

The failure indicator includes a carrier infested with an acid-base indicator, and the carrier includes paper, cotton or artificial cloth.

The advantages of the present invention are that it can be connected to the inhalation interface of the anesthesia machine through the connection port of the inhalation connecting pipe, and can be connected to the exhalation interface of the anesthesia machine through the second connection port of the absorption body, which improves the convenience of connection and coordination with the anesthesia machine and reduces Match connection costs. The gas discharged into the exhalation connecting tube through the breathing interface can be absorbed by the carbon dioxide absorber and enter the anesthesia machine to realize the effective absorption of carbon dioxide during respiratory support; the carbon dioxide absorber in the carbon dioxide absorber can achieve the absorption of carbon dioxide in the form of particles Or coiled; the gas passing through the suction connecting pipe can be filtered through the suction connecting pipe filter, and the gas passing through the breathing connecting pipe can be filtered through the exhalation connecting pipe filter, which improves the convenience and reliability of use , It can really realize the promotion of clinical one-person one-pot one-time use and reduce the risk of cross-infection.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a suction connecting pipe filter provided in the suction connecting pipe of the present invention.

FIG. 2 is a schematic diagram of two exhalation connecting tube filters provided in the exhalation connecting tube of the present invention.

Fig. 3 is a schematic diagram of the carbon dioxide absorber of the present invention using an absorbent cartridge.

FIG. 4 is a schematic diagram of the carbon dioxide absorbent of the present invention adopting a roll shape.

5 is a schematic diagram of the carbon dioxide absorbent of the present invention in a roll shape and placed in an absorbent cartridge.

FIG. 6 is a schematic diagram of the carbon dioxide absorbent of the present invention in a roll shape and placed in an absorbent tank.

7 is a schematic diagram of an embodiment of the rolled carbon dioxide absorbent of the present invention.

8 is a schematic diagram of another embodiment of the rolled carbon dioxide absorbent of the present invention.

9 is a schematic diagram of an embodiment of the water-absorbing and breathable layer of the present invention.

DESCRIPTION OF REFERENCE NUMERALS: 1-breathing interface, 2-inspiratory connecting tube, 3-expiratory connecting tube, 4-tube connecting port, 5-inspiratory connecting tube connector, 6-inspiratory connecting tube filter, 7- Absorber second connection port, 8-expiratory connecting tube filter, 9-absorbent tank, 10-particulate absorbent, 11-intermediate baffle, 12-bottom baffle, 13-absorbent cartridge, 14-roll Absorbent, 15-carbon dioxide absorption layer, 16-water-absorbent breathable layer, 17-breathable support layer, 18-absorbent body and 19-water reservoir.

detailed description

The present invention will be further described below with reference to specific drawings and embodiments.

In order to facilitate the connection and coordination with the anesthesia machine, and realize the absorption of carbon dioxide during the anesthesia breathing support, improve the convenience and reliability of use, and reduce the risk of cross-infection, the present invention includes the ability to absorb carbon dioxide gas in the exhaled gas of patients under general anesthesia A carbon dioxide absorber including a carbon dioxide absorbent and a carbon dioxide absorption cavity for accommodating the carbon dioxide absorbent; the carbon dioxide absorption cavity is straight or curved, and the carbon dioxide absorbent is in the form of loose particles or loose Reel-shaped; the effective circulation cross-sectional area of the gas in the carbon dioxide absorber is greater than 40mm ² ; the two ends of the carbon dioxide absorption cavity are respectively provided with a first connection port of the absorber and a second connection port 7 of the absorber; the carbon dioxide absorber passes through the The first connection port of the absorber is tightly connected with the anesthesia breathing circuit; the inner diameter of the second connection port 7 of the absorber is 22mm±0.5mm, and the carbon dioxide absorber can exhale with the anesthesia machine through the second connection port 7 of the absorber The interface is adapted and sealed; the exhaled gas of the general anesthetized patient enters the carbon dioxide absorber through the first connection port of the absorber, and the gas entering the carbon dioxide absorber is absorbed by the carbon dioxide absorbent from the second connection port 7 of the absorber and enters the anesthesia machine for breathing Pipeline.

Specifically, the carbon dioxide absorber is provided with a carbon dioxide absorber capable of absorbing carbon dioxide gas. The carbon dioxide absorber can use the currently commonly used materials. The process of using the carbon dioxide absorber to achieve the absorption of carbon dioxide is well known to those skilled in the art, and will not be described here. Repeat. When in use, the carbon dioxide absorber is located outside the anesthesia machine, and the carbon dioxide absorber is fitted and sealed with the exhalation interface of the anesthesia machine through the second connection port 7 of the absorber, and the inner diameter of the second connection port 7 of the absorber is 22mm±0.5mm , The second connection port 7 of the absorber can be directly sleeved on the exhalation interface of the anesthesia machine, and after the second connection port 7 of the absorber is connected to the exhalation interface of the anesthesia machine, the exhalation interface of the anesthesia machine can be sealed . In the prior art, the carbon dioxide absorber is placed in the anesthesia machine, and different manufacturers use different interfaces in the design and production of the anesthesia machine and the carbon dioxide absorber, resulting in complicated connection methods, which will increase the matching between the carbon dioxide absorber and the anesthesia machine. Connection costs. However, each anesthesia machine is provided with an exhalation interface and an inhalation interface. In the embodiment of the present invention, the carbon dioxide absorber is adapted to the exhalation interface of the anesthesia machine through the second connection port 7 of the absorption body and is tightly connected. The size of the exhalation interface, if the size of the second connection port 7 of the absorber is set to 22 mm±0.5 mm, the convenience of matching connection with the anesthesia machine can be improved, and the cost of matching connection can be reduced. After the external carbon dioxide absorber is connected to the exhalation interface of the anesthesia machine through the second connection port 7 of the absorber, the carbon dioxide gas can still be absorbed without affecting the gas treatment of the existing anesthesia machine.

The carbon dioxide absorbent is placed in the carbon dioxide absorption cavity, and the carbon dioxide absorption cavity is straight or curved. The shape of the carbon dioxide absorption cavity determines the flow path of the carbon dioxide gas in the carbon dioxide absorption body. When the carbon dioxide absorption cavity is straight, the gas containing carbon dioxide flows along the length of the carbon dioxide absorption cavity. When the carbon dioxide absorption cavity is curved, it can increase the flow path of the carbon dioxide-containing gas in the carbon dioxide absorption body and improve the effect of carbon dioxide absorption. When the carbon dioxide absorption cavity has a curved shape, the curved shape may be a wave shape or other desired shapes, and the specific shape may be selected and determined according to needs, which will not be repeated here.

As shown in FIGS. 3, 4 and 5, when the carbon dioxide absorption channel is straight, the carbon dioxide absorber includes an absorbent cartridge 13, the carbon dioxide absorbent is filled in the absorbent cartridge 13, and the cavity inside the absorbent cartridge 13 can Form a carbon dioxide absorption cavity. As shown in FIGS. 1, 2 and 6, the carbon dioxide absorber includes an absorbent tank 9, and a bottom baffle 12 and an intermediate space adapted to be connected to the bottom baffle 12 are provided in the lower part of the absorbent tank 9 The plate 11 cooperates with the bottom baffle 12 through the intermediate partition 11 to form a curved carbon dioxide absorption cavity in the absorbent tank 9.

The lower end of the intermediate baffle 11 is connected to the bottom baffle 12, and the top of the intermediate baffle 11 is connected to the top in the absorbent tank 9. The bottom baffle 12 may be in the form of a mesh, that is, it will not affect the flow of gas. The gas entering the absorbent tank 9 can flow along the carbon dioxide absorption cavity, thereby increasing the contact between the carbon dioxide in the gas and the carbon dioxide absorbent, and improving the efficiency and reliability of carbon dioxide absorption. The carbon dioxide absorbent can fill the carbon dioxide absorption cavity. When the area under the bottom baffle 12 is not filled with carbon dioxide absorbent, a water storage tank 19 can be formed at the bottom of the absorbent tank 9.

In the embodiment of the present invention, after the carbon dioxide absorbent is installed in the carbon dioxide absorption cavity, the effective gas flow cross section is greater than 40 mm ² , that is, the effective flow of the gas in the carbon dioxide absorber can be ensured. In specific implementation, the specific size of the gas effective flow cross section can be Choose according to actual needs, as long as it will not affect the normal flow of gas and the absorption of carbon dioxide.

Further, the carbon dioxide absorber communicates with the exhalation connecting pipe 3 of the anesthesia breathing circuit through the first connection port of the absorber, the exhalation connecting pipe 3 communicates with the breathing interface 1 of the anesthesia breathing circuit; the breathing interface 1 also communicates with anesthesia The suction connection 2 of the breathing circuit is connected, and the suction connection 2 can be adapted to the suction interface of the anesthesia machine and connected in a sealed manner.

In the embodiment of the present invention, the inhalation connecting pipe 2 and the exhalation connecting pipe 3 include bellows; the length of the inhalation connecting pipe 2 is longer than that of the exhalation connecting pipe 3, and the length of the inhalation connecting pipe 2 is connected to the exhalation The sum of the corresponding lengths of the tube 3 and the carbon dioxide absorber is consistent. The sum of the lengths of the exhalation connecting tube 3 and the carbon dioxide absorber means that the path length of the gas flow containing carbon dioxide is close to or the same as the length of the exhalation connecting tube 2.

In the embodiment of the present invention, the breathing interface 1, the inhalation connecting pipe 2, the exhalation connecting pipe, the inhaling connecting pipe filter 6, and the carbon dioxide absorber need to be made of materials that meet medical standards, and the specific materials can be selected according to needs , No more details here. The breathing interface 1 is connected and communicated with the inhalation connecting tube 2 and the exhalation connecting tube 3 through the tube body connection port 4, and the tube body connection port 4 is U-shaped. It can be connected to the person to be breathed through the breathing interface 1, and can be connected to the suction interface of the anesthesia machine through the suction connecting tube 2, that is, the gas in the anesthesia machine enters the suction connecting tube 2, and enters the waiting interface through the breathing interface 1. In the body of the breathing supporter; the carbon dioxide absorber is connected to the exhalation connecting pipe 3 through the first connection port of the absorber. After the first connection port of the absorber is connected and connected to the exhalation connecting pipe 3, the carbon dioxide absorber can be connected to the breathing interface 1 Connected. The gas to be exhaled by the breathing supporter enters the exhalation connecting tube 3 through the breathing interface 1, and the carbon dioxide absorbent can be absorbed by the carbon dioxide absorbent adapted to the exhalation connecting tube 3, and the gas after removing the carbon dioxide can enter the anesthesia machine So that the gas can be recycled.

In the embodiment of the present invention, a suction connection port 5 is provided at the end of the suction connection 2, and the suction connection port 5 can be adapted to the suction interface of the anesthesia machine and sealedly connected. The suction connecting tube filter 6 is adapted to the suction connecting tube 2 and is hermetically connected. Generally, the suction connecting tube filter 6 is placed in the suction connecting tube 2 so as to pass through the suction connecting tube 2 into the breathing interface 1 The gas inside is filtered. The suction connecting pipe filter 6 can be in a commonly used form. The suction connecting pipe filter 6 can filter dust and bacteria, thereby reducing the risk of cross-infection. The inhalation connecting tube 2 and the exhalation connecting tube 3 are adapted and sealed to the inhalation interface and the exhalation interface of the anesthesia machine, and the carbon dioxide absorber is located outside the anesthesia machine, which can effectively absorb carbon dioxide during respiratory support, and Improve the convenience and reliability of the connection and cooperation with the anesthesia machine.

In the embodiment of the present invention, both the inhalation connecting pipe 2 and the exhalation connecting pipe 3 use bellows, which can facilitate the connection with the supporters to be breathed in different positions when the position of the anesthesia machine is fixed. An exhalation connecting pipe filter 8 can be provided in the exhalation connecting pipe 3, and the gas passing through the exhalation connecting pipe 3 can be filtered by the exhalation connecting pipe filter 8. The exhalation connecting pipe filter 8 can be The air tube filter 6 has the same structure. The inner diameter of the suction connecting pipe joint 5 is 22mm±0.5mm. It can be easily connected to the corresponding port of the anesthesia machine through the suction connection 5 and the second connection port 7 of the absorber. The suction connection 5 and the suction connection 2 are detachably connected, and the absorber is connected second A separable connection is adopted between the port 7 and the exhalation connecting tube 3.

FIG. 1 shows a case in which an intake connecting pipe filter 6 is provided in the intake connecting pipe 2 and the intake connecting pipe filter 6 is close to the intake connecting pipe joint 5, and at the same time, the exhalation connecting pipe 3 An expiratory connecting pipe filter 8 is provided inside, and the expiratory connecting pipe filter 8 is correspondingly connected to the second connection port 7 of the absorber. FIG. 2 shows the case where one suction connecting pipe filter 6 is provided in the suction connecting pipe 2 and the suction connecting pipe filter 6 is correspondingly connected to the pipe body connection port 4; meanwhile, the breath connecting pipe In the 3, two exhalation connecting tube filters 8 are provided, and the two exhalation connecting tube filters 8 are respectively located on both sides of the carbon dioxide absorber. In FIGS. 3 and 5, the distribution of the inhalation connecting filter 6 and the exhalation connecting filter 8 is similar to that in FIG. 2, and in FIGS. 4 and 6, the inhalation connecting filter 6, the exhalation connection The distribution of the filter 8 is similar, that is, the suction connecting pipe filter 6 is correspondingly connected to the pipe body connection port 4, and the exhalation connecting pipe filter 8 is correspondingly connected to the exhalation connecting pipe joint 7. Of course, the specific distribution of the inspiratory connecting tube filter 6 and the exhaling connecting tube filter 8 can be selected as needed, and will not be listed here one by one.

Further, when the carbon dioxide absorbent is in a loose roll shape, the carbon dioxide absorbent layer 15 is pressed into a carbon dioxide absorption layer 15 by pressing the muddy carbon dioxide absorbent, and the carbon dioxide absorption layer 15 is wound into a roll shape and dried to form the desired Roll-shaped carbon dioxide absorbent.

In the embodiment of the present invention, the main component of the carbon dioxide absorbent is calcium hydroxide. In order to obtain a roll-shaped carbon dioxide absorbent, it is necessary to prepare the carbon dioxide absorbent layer 15 using the carbon dioxide absorbent. The prepared carbon dioxide absorbent layer 15 is In the form of a long strip, the obtained carbon dioxide absorption layer 15 can be wound and dried to form a desired roll-shaped carbon dioxide absorbent.

Further, when the carbon dioxide absorbent is in the form of a loose roll, the carbon dioxide absorbent includes a carbon dioxide absorption layer 15 and a water-absorbing and breathable layer 16 adapted to the carbon dioxide absorption layer 15; the muddy carbon dioxide absorbent is compressed into carbon dioxide absorption Layer 15, and the carbon dioxide absorption layer 15 and the water-absorbent gas-permeable layer 16 are combined and wound into a roll shape, and after drying, the required roll-shaped carbon dioxide absorbent can be formed.

In the embodiment of the present invention, the water-absorbing and breathable layer 16 includes a gas-permeable support layer 17 and a plurality of water-absorbing bodies 18 disposed on the gas-permeable support layer 17; the gas-permeable support layer 17 includes a sponge, and the gas-permeable support layer 17 may also adopt other porous The material is made of water. The water-absorbing body 18 includes water-absorbing resin. The water-absorbing body 18 can also be made of other hydrophilic water-locking materials. The specific material type is selected according to needs, and will not be repeated here.

After the absorption gas-permeable layer 16 and the carbon dioxide absorption layer 15 are compounded, the carbon dioxide absorption layer 15 and the absorption gas-permeable layer 16 are laminated to form one body. Of course, when the absorption gas-permeable layer 16 and the carbon dioxide absorption layer 15 are compounded, the absorption gas-permeable layer 16 can also be mixed into carbon dioxide The compounding method between the absorption layer 15, the absorption gas-permeable layer 16 and the carbon dioxide absorption layer 15 can be selected according to needs, and specific compounding can be carried out using the existing process conditions, which will not be described in detail.

Specifically, the absorbent cartridge 13 has a cylindrical shape, and the longitudinal direction of the absorbent cartridge 13 coincides with the longitudinal direction of the exhalation connecting tube 3. When the carbon dioxide absorbent is in a granular form, a granular absorbent 10 is obtained; when the carbon dioxide absorbent is in a rolled form, a rolled absorbent 14 is obtained, and both the particulate absorbent 10 and the rolled absorbent 14 can be placed in an absorbent tank 9 and/or the absorbent cartridge 13 can be selected according to specific needs, which will not be repeated here. In a specific implementation, the carbon dioxide absorbent can be prepared using an existing process, and the manner in which the particulate absorbent 10 is placed in the absorbent tank 9 and the absorbent cartridge 13 is well known to those skilled in the art, and will not be repeated here.

The carbon dioxide absorber is also provided with a water storage tank 15 which is located below the carbon dioxide absorbent. The water collection tank 15 can store water generated during the absorption of carbon dioxide.

Further, a failure indicator for indicating the absorption state of the carbon dioxide gas is also provided in the carbon dioxide absorber, and the failure indicator is adjacent to the second connection port 7 of the absorber.

In the embodiment of the present invention, the failure indicator includes a carrier infested with an acid-base indicator, and the carrier includes paper, cotton, or artificial cloth. The acid-base indicator includes bromothymol blue, neutral red, phenol red and the like. When the gas discharged from the second connection port 7 of the absorber contains carbon dioxide gas, the failure indicator will change color. At this time, it means that the carbon dioxide absorber cannot effectively absorb the carbon dioxide gas, and the carbon dioxide absorber needs to be replaced. When the gas discharged from the second connection port 7 of the body does not contain carbon dioxide gas, the color of the failure indicator does not change, and the medical staff can judge the absorption of carbon dioxide according to the state of the color change of the failure indicator. The color change of the failure indicator is related to the type of acid-base indicator, etc., so we will not list them one by one here.

Claims

An external type carbon dioxide absorption device is characterized by comprising a carbon dioxide absorber capable of absorbing carbon dioxide gas in the exhaled gas of a patient under general anesthesia, the carbon dioxide absorber including a carbon dioxide absorbent and a carbon dioxide absorption cavity for accommodating the carbon dioxide absorbent The carbon dioxide absorption channel is straight or curved, and the carbon dioxide absorbent is in the form of loose particles or loose rolls; the effective circulation cross-sectional area of the gas in the carbon dioxide absorption body is greater than 40mm 2 ; The first end of the absorption body and the second connection port (7) of the absorption body are respectively communicated with each other; the carbon dioxide absorption body is sealedly connected to the anesthesia breathing line through the first connection port of the absorption body; the second connection port of the absorption body ( 7) The inner diameter size is 22mm±0.5mm, and the carbon dioxide absorber can be fitted and sealed with the exhalation interface of the anesthesia machine through the second connection port of the absorber (7); the exhaled gas of patients under general anesthesia passes through the first connection port of the absorber After entering the carbon dioxide absorption body, the gas entering the carbon dioxide absorption body is absorbed by the carbon dioxide absorbent, and then enters the breathing circuit in the anesthesia machine through the second connection port (7) of the absorption body.
The external type carbon dioxide absorption device according to claim 1, wherein when the carbon dioxide absorbent is in a loose roll shape, the carbon dioxide absorption layer (15) is compressed by pressing the muddy carbon dioxide absorbent to absorb carbon dioxide The layer (15) is wound into a roll shape and dried to form a desired roll-shaped carbon dioxide absorbent.
The external type carbon dioxide absorption device according to claim 1, wherein when the carbon dioxide absorbent is in a loose roll shape, the carbon dioxide absorbent includes a carbon dioxide absorption layer (15) and the carbon dioxide absorption layer (15) Adaptable water-absorbing and breathable layer (16); press the muddy carbon dioxide absorbent into a carbon dioxide absorbing layer (15), and combine the carbon dioxide absorbing layer (15) and the water-absorbing and breathable layer (16) after winding into a roll shape and in After drying, it can form the required roll-shaped carbon dioxide absorbent.
The external carbon dioxide absorption device according to claim 3, characterized in that the water-absorbing gas-permeable layer (16) includes a gas-permeable support layer (17) and a plurality of water-absorbing bodies (18) provided on the gas-permeable support layer (17) The breathable support layer (17) includes a sponge, and the water-absorbing body (18) includes a water-absorbing resin.
The external type carbon dioxide absorption device according to claim 1 or 2, characterized in that a water accumulation tank (15) is further provided in the carbon dioxide absorption body, and the water accumulation tank (15) is located below the carbon dioxide absorbent.
The external carbon dioxide absorption device according to claim 1, wherein the carbon dioxide absorber communicates with the expiratory connecting pipe (3) of the anesthesia breathing circuit through the first connecting port of the absorber, the expiratory connecting pipe (3) It is connected to the breathing interface (1) of the anesthesia breathing circuit; the breathing interface (1) is also connected to the suction connection (2) of the anesthesia breathing circuit, and can be connected to the suction interface of the anesthesia machine through the suction connection (2) Fit and seal the connection.
The external carbon dioxide absorption device according to claim 6, characterized in that the inhalation connecting pipe (2) and the exhalation connecting pipe (3) include bellows; the length of the inhalation connecting pipe (2) is greater than The length of the exhalation connecting tube (3) and the inhalation connecting tube (2) are consistent with the sum of the corresponding lengths of the exhalation connecting tube (3) and the carbon dioxide absorber.
The external carbon dioxide absorption device according to claim 1, characterized in that an exhalation connecting tube filter (8) is provided in the carbon dioxide absorption body, and the exhalation connecting tube filter (8) is adjacent to the second absorption body Connection port (7).
The external carbon dioxide absorption device according to claim 1, wherein a failure indicator for indicating the state of absorption of carbon dioxide gas is further provided in the carbon dioxide absorption body, and the failure indicator is adjacent to the second connection port of the absorption body (7).
The external type carbon dioxide absorption device according to claim 9, wherein the failure indicator includes a carrier infested with an acid-base indicator, and the carrier includes paper, cotton or artificial cloth.