CN113171509B

CN113171509B - Device for collecting injection residual liquid and infusion apparatus with same

Info

Publication number: CN113171509B
Application number: CN202110450793.7A
Authority: CN
Inventors: 张晶
Original assignee: Xuanwu Hospital
Current assignee: Xuanwu Hospital
Priority date: 2021-04-25
Filing date: 2021-04-25
Publication date: 2022-08-05
Anticipated expiration: 2041-04-25
Also published as: CN113171509A

Abstract

The invention relates to a device for collecting residual injection liquid and an infusion set with the device. The liquid to be input into the patient goes from an infusion bottle to an indwelling needle or a needle point through an infusion channel of an infusion tube, and the device for collecting the injection residual liquid comprises a joint and a first containing cavity. The connector comprises a first channel which is communicated with a transfusion channel of a transfusion tube so as to collect gas and a small amount of liquid in the transfusion channel; the second channel is communicated with the first channel and can control whether the joint is communicated with the external atmospheric environment or not; and the third channel is communicated with the first channel and the second channel and is used for connecting the first accommodating cavity. When the infusion channel is connected with the first channel and the liquid in the infusion channel approaches the first channel, the gas and part of the liquid in the infusion channel enter the first channel based on the rebound of the first accommodating cavity in the pressing state, so that the infusion channel is filled with the liquid medicine as much as possible.

Description

Device for collecting injection residual liquid and infusion apparatus with same

Technical Field

The invention relates to the technical field of medical instruments, in particular to a device for collecting injection residual liquid and an infusion apparatus with the device.

Background

Chemotherapy is a common method for treating tumors at present, and adopts chemical drugs to kill cancer cells so as to achieve the purpose of treatment. Regardless of the route of administration, the chemotherapeutic agent is distributed throughout most organs and tissues throughout the body with blood circulation. The chemotherapy drugs are mainly cytotoxic drugs, and can kill cancer cells and damage normal cells of the whole body all over the body, so that chemotherapy patients often have drug side effects such as nausea, diarrhea, leukopenia, thrombocytopenia and alopecia. Moreover, in the process of preparation of chemotherapeutic drugs, aerosol containing toxic particles can be formed and enter human body through skin and respiratory tract, and the damage to normal tissues of the body such as bone marrow and digestive tract is particularly serious, so that toxic reactions such as leukopenia, alopecia, nausea and the like of nursing staff are caused, and the occupational damage to medical staff is extremely large.

At present, the safe configuration of the chemotherapy drugs is gradually paid attention, various closed operation boxes for configuring the chemotherapy drugs are invented, but the harm possibly caused in the use process of the drugs is still not paid enough attention. The chemotherapy drugs are mostly injected into the vein in the process of clinical administration to patients, in order to avoid air injection into the patients to cause patient blood embolism, the transfusion device needs to be exhausted before injection, and the exhaust process takes the discharged liquid as the indication of the completion of the exhaust in the needle. However, the discharged liquid medicine is often not properly disposed of and is often discharged into a designated open container or even directly to the ground. Toxic particles in the liquid medicine volatilize into the air, and the health people still can generate poison after inhaling, which is not beneficial to the self health of medical care personnel and nursing personnel. Although the single-time release volatilization amount is small, the independent space in a hospital is small, the number of patients needing to be cared for injection by medical staff is large, particularly in a tumor hospital, the toxic substance harm is gradually accumulated after a small amount of multiple inhalations, and the medical staff can absorb at least thousands of milliliters of medicine within one year. It is extremely harmful to medical staff.

The prior art discloses devices that are capable of collecting a liquid drug at the forward end of a needle tip. For example, CN204293625U discloses a collection bottle for exhaust and drainage before injection of chemotherapeutic drugs, which comprises a bottle body, a flange and a bottle mouth, wherein the flange is arranged at the front end of the bottle body, and a rubber layer, a test paper layer and a sealing film are arranged at the bottle mouth; a soft film window is arranged at the rear end of the bottle body, a soft film cavity filled with a neutralizing agent is attached to the soft film window, and a top bead is arranged in the soft film cavity; an injection protection plate is arranged corresponding to the convex edge: the middle of the injection protection plate is provided with a bottle sleeving hole, and the diameter of the bottle sleeving hole is larger than that of the bottle body and smaller than the outer diameter of the convex edge. When the device is used, the needle tip of the infusion set is inserted from the bottle mouth, and liquid and gas are discharged into the bottle body. The rubber layer, the test paper layer and the sealing film are arranged at the bottle mouth, and after the needle tip is pulled out of the bottle mouth, the rubber layer can seal the bottle mouth to prevent gas or liquid in the bottle from volatilizing into the external environment. And the neutralizing agent in the soft capsule cavity is released to detoxicate the medicine. However, the needle tip of the infusion set is required to be directly inserted into the bottle mouth in the using process of the device, the needle tip is easily polluted due to incomplete sterilization of the bottle mouth, and even the device is inserted into the body of a patient again to cause infection of the patient. If still need disinfect to disinfection solution such as bottle mouth wiping alcohol or iodophor alone before inserting the needle point then increased a plurality of steps before infusing for the infusion process is more complicated, increases medical personnel's work burden.

Furthermore, on the one hand, due to the differences in understanding to those skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the collecting device which can help the transfusion device exhaust and discharge liquid and collect the discharged liquid so as to reduce the harm of the volatile toxic particles of the liquid to healthy people.

The invention relates to a device for collecting residual injection liquid, wherein liquid to be input to a patient is triggered from an infusion bottle to an indwelling needle or a needle point through an infusion channel of an infusion tube. The device includes a fitting and a first receiving cavity. Wherein the fitting includes a first channel, a second channel, and a third channel. The first channel is used for being communicated with the infusion channel of the infusion tube so as to collect gas and a small amount of liquid in the infusion channel; the second channel is communicated with the first channel and can control whether the joint is communicated with the external atmospheric environment or not; the third passage communicates with the first passage and the second passage. The third passage is used for connecting the first accommodating cavity. When the infusion channel is connected with the first channel and the liquid in the infusion channel approaches the first channel, the gas and part of the liquid in the infusion channel enter the interior of the first channel based on the rebound of the first containing cavity in the pressing state, so that the infusion channel does not contain gas or contains tiny bubbles which are almost invisible to naked eyes and meet the infusion condition. The first channel, the second channel, the third channel and the first accommodating cavity are made of the same materials, and are especially prepared in one process at one time. The arrangement mode can greatly save the processes of material configuration, mold feeding, demolding and the like during the preparation of the device, the material same as the infusion tube and the mold integrated with the infusion tube are used, the same assembly line and the same process can be adopted for the infusion tube during the preparation, the additional manpower is not needed, the assembly line is not needed to be independently arranged, and the manufacturing cost of the device is greatly reduced. Apart from the fact that the first receiving chamber needs to be formed with a thin wall in order to achieve the desired elasticity (or even to obtain elasticity in a two-component injection molding manner), the remaining devices can be manufactured completely from the same material as conventional infusion sets, without the need for complicated safety certification procedures for the material of the collecting device or the need for relatively simple procedure certification of the medical instrument.

According to a preferred embodiment, the second channel is provided with a first sealing cover capable of sealing the second channel in a manner of controlling the communication between the joint and the external environment; the first channel is provided with a second sealing cover in a manner of being capable of closing the first channel.

According to a preferred embodiment, the first receiving space comprises a seal for preventing the gas in the first receiving space from flowing out to the third channel, the seal being connected to the inner wall of the third channel, in particular in a piston-cylinder movement fit, in such a way that it can be displaced along the third channel toward the first channel as a result of the gas in the first receiving space.

According to a preferred embodiment, the angle α between the central axis of the second channel and the central axis of the first channel is larger than the angle β between the central axis of the second channel and the third channel in such a way that the gas and liquid in the infusion tube follow the first path.

According to a preferred embodiment, in the case where the joint is sealed based on the first and second sealing caps and the joint is expanded by the heated internal gas, the first passage is provided with an openable and closable gas port that can discharge the gas inside the joint to the outside environment only in one direction, which enables the first passage to communicate with the outside environment, in such a manner that the gas inside the joint can be discharged to the outside environment to reduce the pressure inside the joint, the gas port being used to discharge the gas inside the joint to the outside environment.

According to a preferred embodiment, the gas port comprises a gas passage and a filter portion, and the gas in the joint reaches the filter portion through the gas passage based on pressure, and is discharged to the outside through the filter portion after absorbing the toxic particles at the filter portion. The air port comprises a first part and a second part, and the first part and the second part are movably and hermetically connected with each other in a mode that the clamping degree of the first part and the second part can be changed by one hand and the opening and closing of the air port are controlled. The first part comprises a sealing plug consisting of a push rod and a plug head. The second part comprises a clamping groove matched with the push rod and the plug head in shape. The plug is connected to one end of the push rod. The other end of the push rod opposite to the plug head is connected with the first channel. The clamping groove and the plug head form a gas channel when being loosened and clamped.

According to a preferred embodiment, the second part is provided with a filter part in such a way that it is able to filter toxic particles from the gas discharged into the environment through the gas opening, the filter part comprising a neutralizing liquid medicine which is arranged between the gas channel and the environment in such a way that it is able to filter the gas sufficiently.

According to a preferred embodiment, the height of the seal is higher than the height of the closure when the first receiving chamber is not compressed by an external force.

According to a preferred embodiment, the first part is provided with a first membrane in such a way that gas is allowed to flow out of the environment through the gas port and liquid is not allowed to flow out, and the second part is provided with a second membrane in such a way that neutralized medical liquid in the infusion set is prevented from entering the first part.

The invention also relates to an infusion set comprising at least a device for collecting residual infusion liquid as described above.

The invention has the beneficial technical effects that:

first, it can help the infusion set to vent quickly and to enclose gases and liquids containing toxic particles in the fitting. Sterile gas in the infusion channel can flow out to the external environment through the first channel and the second channel because the closing cap of the second channel is not closed, and when the air which is in contact with the liquid medicine in the infusion channel and is relatively tight reaches the first channel, the closing cap of the second channel can be closed to retain the gas which is in close contact with the liquid medicine and contains more toxic particles in the joint, at the moment, the resilience of the sealing piece in the first accommodating cavity is used for sucking the gas and a small amount of liquid in the infusion channel into the first channel, so that the infusion channel can be fully occupied by the liquid medicine, and the infusion device is helped to finish the exhaust and drainage operation before infusion.

Second, the infusion set is not contaminated. The connector is made of the same material as the infusion tube, can be sterilized with the infusion tube at the same time, does not need to be sterilized when exhausting, saves operation steps, and prevents the infusion port and the infusion channel of the infusion apparatus from being polluted and polluted externally. The transfusion channel of the transfusion device can be disconnected with the first channel of the connector and then connected with the indwelling needle of the patient, and the indwelling needle of the specific connector does not need to be separately configured for the transfusion device. And the first channel after disconnection can be sealed by the second sealing cover, and the joint can be sealed by itself, so that the discharged liquid medicine is prevented from volatilizing into the air again.

Third, the device has extremely high safety. The setting of gas port makes when meetting the inside gas expansion of heat source when the joint is preserved, and toxic gas can discharge to the external environment after the filter house of gas port filters to avoided gas expansion and liquid to volatilize once more and lead to the inside atmospheric pressure of joint too big and the possibility that gas leaks from first sealed lid and the sealed lid of second. The air which is possibly provided with volatile harmful particles and is contacted with the liquid medicine in the infusion apparatus can be discharged into the air after being filtered by the filtering part, and the volatilization amount of the medicine in the air is fully reduced. The movable sealing connection of the first part and the second part of the gas port ensures that gas does not leak in the using process of the gas port, and a user can control the opening and closing of the gas port by one hand, so that the use is convenient and fast, the work efficiency of the user is convenient to improve, and the control sensitivity of the device is improved.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the present invention; FIG. 2 is a schematic view of the structure of a preferred embodiment of the closure of the present invention; fig. 3 is a schematic structural view of another preferred embodiment of the present invention.

List of reference numerals

100: the infusion channel 200: the joint 210: first channel

220: second passage 230: third passage 211: air port

231: first accommodation chamber 2111: first portion 2112: the second part

21111: first film body 21121: the second film body 21112: push rod

21113: plug 21122: engagement groove 2113: gas channel

212: first marking line 21123: the connecting portion 21124: neutralizing liquid medicine

21125: the third film body 232: seal 212: sealing layer

221: first seal cover 211: second sealing cover

Detailed Description

This is described in detail below with reference to fig. 1-3.

Example 1

For medical care personnel, the space for frequently operating in a dispensing room or an injection room is limited, even in a narrow space with dense crowds, and a small amount of toxic and harmful gas liquid can be frequently released in a small dose to cause long-term toxicity, so that certain harm is caused to the medical care personnel and the like. Therefore, the invention provides a device for collecting injection residual liquid, which can collect gas and liquid discharged from a needle point or a liquid outlet of an infusion apparatus before injection so as to reduce the possibility that discharged air and liquid drops with toxic particles in medicine are dispersed into the air and damage to the basic tissues of healthy people, such as bone marrow, digestive system and the like, is caused after the air and liquid drops are inhaled by the healthy people.

The collecting device according to the invention comprises a joint 200. The fitting is provided with a first channel 210 and a second channel 220. The first channel 210 is used to communicate with the infusion set channel 100, and the second channel 220 is used to communicate the interior of the connector 200 with the external atmosphere, so that the liquid in the infusion set channel 100 can flow from the infusion set to the connector 200 through the infusion tube based on the atmospheric pressure. The second passage 220 is provided with a first sealing cover 221 capable of cutting off the communication of the second passage 220 with the external environment. The seal cap can be opened and closed by a single hand control of the surgeon. Preferably, the fitting 200 is made of the same material as the infusion tubing. And the first channel 210 is detachably connected to the administration channel 100. Preferably, the fitting 200 is co-manufactured with the infusion tubing into a package. Such a setting method is advantageous: (1) the connector 200 can be sterilized together with the infusion tube and packaged in a one-way mode, the connector does not need to be sterilized again when in use, and infusion steps are saved; (2) the joint 200 can be made of the same material as the infusion tube, safety certification for the material of the joint 200 is not needed, the joint is not needed to be separately configured, and the shape of the joint 200 can be the same ring shape as the infusion tube; (3) the cost is saved, the manufacturing material of the joint 200 is the same as that of the infusion tube, and the joint 100 only needs to contain 1-2 drops of liquid, so that the joint is small in structure and can be manufactured only by using the residual leftover materials when the infusion tube is manufactured; and the connector 200 has the same shape as the infusion tube so as to be connected with the infusion channel 100 of the infusion tube, so that the connector 200 does not need to be manufactured again and a separate production line is arranged, thereby saving the manufacturing cost.

According to a preferred embodiment, the infusion line and the connector 200 are already connected to one another during the sterile plastic encapsulation. A first indicator line 212 is provided in the infusion tube near the location where it connects to the first channel 210. Preferably, a second sealing cover 211 for sealing the first passage 210 is connected to the first passage 210 by a connecting line. When in use, the infusion tube and the connector 200 are taken out from the plastic package by a user, and one end of the infusion tube is connected with the infusion bottle. The roller on the infusion tube is then opened so that fluid can flow out through the infusion channel 100 of the infusion tube. Then, the second channel 220 of the connector 200 is opened, and the infusion tube 100 is connected to the external atmosphere through the connector 200, so that the medical fluid in the infusion bottle can gradually move toward the connector 200 along the infusion tube. When the liquid moves to the first indicator line 212, the cap of the second channel 220 is closed so that the liquid in the administration channel can remain at the first indicator line 212.

According to a preferred embodiment, the joint 200 further comprises a third channel 230, the third channel 230 ending with a first housing cavity 231. The first receiving chamber 231 is hermetically and tightly connected with the third passage 230. The first accommodating chamber 231 is pre-prepared with sterile air therein, and the first accommodating chamber 231 is provided with an opening. A seal 232 is provided at the opening. The seal 232 can prevent the gas inside the first receiving chamber 231 from flowing out into the third passage 230. The outer periphery of the seal 232 is sealingly slidably connected to the inner wall of the third passage 230, particularly in a piston-cylinder movement fit. The sealing member 232 can slide along the inner wall of the third passage 230 by the urging force. Preferably, the sealing member 232 is provided as a check valve in which a gas-liquid gate direction is provided to allow external gas and liquid to enter the first accommodation chamber 231 without allowing gas inside the first accommodation chamber 231 to flow out to the outside.

Preferably, the preparation material of the first receiving cavity 231 is selected as: the material can generate deformation and has certain elasticity to bounce itself. The user is enabled to slide the sealing member 232 along the inner wall of the third channel 230 towards the first channel 210 by pressing the first receiving chamber 231, so that the sealing member 232 moves from a first working position in the third channel 230 close to the first receiving chamber 231 to a second working position away from the first receiving chamber 232, so that a part of the volume in the third channel 230 is occupied by the gas in the first receiving chamber 231, whereby the volume of the third channel 230 actually available for receiving the air in the infusion tube is compressed, and further the volume of the interior of the connector 200 available for receiving the air in the infusion tube is compressed. Before the infusion channel 100, which is in fluid communication with the infusion bottle, is connected to the first channel 210, the user can first pinch the first receiving chamber 231 with the cover 221 of the second channel 220 closed, so that the first receiving chamber 231 is deformed.

Of course, in use, the user may also first pinch the first accommodating cavity 231 with the cover 221 of the second channel 220 open, so as to deform the first accommodating cavity 231, and then close the cover 221 of the second channel 220.

Preferably, the sealing member 232 can slide toward the first accommodation chamber 231 based on the rebound of the first accommodation chamber 231 by releasing the first accommodation chamber 231.

Preferably, when the liquid in the infusion channel 100 flows to the first indication line 212, the first cover 221 of the second channel 220 is closed, the liquid medicine stays at the first indication line 212 of the infusion channel 100, at this time, the first accommodating cavity 231 is released, the first accommodating cavity 231 can rebound based on the elastic force of the first accommodating cavity 231, and the sealing member 232 is driven by the far of the air cylinder to move from the second working position far from the first accommodating cavity 231 in the third channel 230 to the first working position close to the first accommodating cavity 231, the volume of the third channel 230 capable of accommodating the air in the infusion tube is released, so that the volume of the joint 200 for accommodating the air and the liquid in the infusion tube is increased, and the air pressure is reduced. To equalize the air pressure, the fluid at the first indicator line 212 moves into the first channel 210 based on the pressure such that the infusion channel of the infusion tube is filled with fluid. At this time, the roller for stopping the flow on the infusion tube is rotated to the closed position, and the infusion path 100 is separated from the first path 210, and the infusion path 100 is connected to the indwelling needle. After the transfusion channel 100 is separated from the first channel 210, the second sealing cover 211 is closed into the first channel 210 so that the toxic gas and liquid flowing out into the first channel 210 are sealed to the inside of the connector. At this point, the nurse may again connect infusion channel 100 to the indwelling needle, the liquid in infusion channel 100 may flow into the patient, and excess gas and small amounts of liquid may be sealed off in access connector 200. In the case where the first accommodation chamber 231 is held as a handle, the gas that fails to enter the first accommodation chamber 231 is also accumulated above the third channel 232 because the gas is lighter than the liquid, and does not enter the patient along with the injection liquid.

Preferably, the position of the first indicating line 212 is related to the volume of the first receiving cavity 231 and the distance the sealing member 232 moves by being pushed by the first receiving space 231. Preferably, to enable liquid in the infusion channel 100 to enter the first channel 210 upon movement of the seal 232, the volume set as the distance of movement of the seal 232 is related to the volume of the infusion channel 100 from the first indicator line 212 to the connection of the infusion channel 100 with the first channel 210.

According to a preferred embodiment, the connector 200 is configured such that the angle α between the central axis of the second channel 220 and the central axis of the first channel 210 is larger than the angle β between the central axis of the second channel 220 and the central axis of the third channel 230, in such a way that the toxic gas in the infusion tube moves towards the first containing chamber 231 and the liquid moves towards the second channel 220. Preferably, the central axes of the first, second and

third channels

210, 220, 230 of the fitting 200 can be in the same plane or not. Through the arrangement mode, (1) the operation can be conveniently carried out by one hand of a user. During use, the user can use the palm to approach the first containing cavity 231 and use the ring finger or the middle finger to hook the second channel to press the first containing cavity 231, so that the sealing member 232 is in the second working position. The first sealing cap 221 can now be controlled using the thumb and forefinger of the same hand for ease of operation. When α is smaller than β, however, it is difficult for the user to keep the balance of the force by using the ring finger or the middle finger, and the index finger and the thumb are also farther from the first sealing cap 221, making it difficult to control the first sealing cap 221. (2) Under the condition that a large amount of liquid is sucked into the joint from the infusion channel 100, the liquid touches the tube wall of the second channel in the process of entering the second channel from the first channel, so that the splashing angle of the liquid is enabled to face the second channel and not to be folded back towards the first channel, and the liquid which is contacted with the tube wall is prevented from rebounding to pollute the infusion tube 100.

According to a preferred embodiment, some chemotherapeutic drugs such as carmustine may cause fatal damage to human respiratory system after volatilizing into the air, and the way of using the first and second sealing caps 221 and 211 to seal the injection residue inside the connector 200 may cause leakage in some special cases. For example, in the case of sunlight or some concentrated treatments, excessive pressure in the joint 200 may cause excessive leakage and increase the concentration of toxic substances in the air, while some toxic gases are flammable and may generate more toxic gases after combustion. Therefore, in order to ensure that the pressure inside the joint 200 is kept low during storage and centralized processing, so as to ensure the sealing performance and the use safety of the joint, the highest position of the first channel 210 is provided with the air port 211. The gas port 211 is used to maintain a low pressure state inside the connector 200 by discharging gas inside the connector 200 in a special case and to filter the discharged gas to filter out toxic particles, so that the concentration of the toxic particles in the gas discharged to the air is reduced. Preferably, the gas port 211 is disposed at the highest position of the first passage 210 of the joint 200. Preferably, a filtering assembly is arranged in the gas port 211, and the filtering assembly can filter and neutralize the gas exhausted from the infusion tube and then output the gas to the external environment, so that the harm of toxic substances to the health of surrounding people is reduced.

Preferably, the height of the highest point of the third channel 230 is greater than the height of the first channel 210 in the use position. And, during the air exhaust process, when the sealing member 232 is at the first working position, the height of the sealing member 232 is higher than that of the air port 211, so that the air entering the connector 200 from the infusion channel 100 will gather at the sealing member 232 or enter the first accommodating cavity 231 for sealing after reaching the sealing member 232 based on the pressure generated when the sealing member 232 moves from the second working position to the first working position, and will not flow out to the air port of the first channel again or even flow back to the infusion channel 100.

According to a preferred embodiment, the filter assembly includes an assembly body and a receiving chamber disposed within the assembly body for storing a neutralizing fluid 21124. The gas port 211 is provided with a first portion 2111 and a second portion 2112 which are movably and sealingly connected to each other so that the opening and closing of the gas port 211 can be controlled by pressing and pulling. The first portion 2111 includes a occluding plug that includes a push rod 21112 and a plug 21113. The plug 21113 is connected to one end of a pushrod 21112, and the other end of the pushrod 21112 opposite the plug 21113 is connected to the outer wall of the fitting 200. The connection face of the connector 200 to the first portion 2111 is provided with a first membrane 21111 in such a way as to allow gas to pass from the connector 200 to the first portion 2111, but not liquid from the connector 200 to the first portion 2111. Preferably, the first film body 21111 may be a PUM waterproof and breathable film. The second portion 2112 includes an engagement groove 21122 that is fitted to the plug 21113 in shape, and a neutralized chemical solution 21124 provided at an end of the engagement groove 21122 opposite to the plug 21113, and the second portion 2112 is provided with a second film 21121 at an end of the engagement groove 21122 opposite to the plug 21113 so that the neutralized chemical solution 21124 is prevented from entering the first portion 2111 through the engagement groove 21122. Preferably, the second film body 21121 may be implemented as a PUM waterproof and breathable film. Preferably, the second portion 2112 is provided with a neutralizing liquid medicine 21124 having a thickness capable of covering the second membrane 21121 in the second portion 2112 in such a manner that the gas flowing to the outside through the gas port 211 is filtered. A third membrane 21125 is disposed above the neutralized medical fluid 21124 in a manner that prevents the neutralized medical fluid 21124 from escaping the second portion 2112 and allows the gas in the connector 200 to be filtered by the neutralized medical fluid 21124 and then discharged to the environment. Preferably, the third film body 21125 can be implemented as a PUM waterproof breathable film. Preferably, second portion 2112 includes a connecting portion 21123. The connection portion 21123 is for connection with the first portion 2111. The connecting portion 21123 is provided with an edge abutting against the first portion 2111 so as to be capable of sealingly moving in connection with the first portion 2111. Preferably, the abutment is provided with a sealing structure provided to the outer wall of the first portion 2111. For example, the sealing structure may be embodied as a flexible sealing membrane or a sealing ring with elasticity. So that when the second portion 2112 moves relative to the first portion 2111, the gas in the gas port 211 can only flow out of the fitting 200 from the second portion 2112 after neutralizing the medical fluid 21124 without leaking contaminated air from the connection between the first portion 2111 and the second portion 2112. The air port 211 can control the opening and closing state of the air port 211 in a pull-up and push-down manner, so that the medical staff can operate conveniently. When the air port 211 is kept in the initially closed state, the stopper 21113 is tightly connected to the engagement groove 21122, and the connector 200 cannot communicate with the external atmosphere through the air port 211, so that the closed state of the inside of the infusion set can be maintained. At this time, when the user pulls up the second portion 2112, the plug 21113 is disconnected from the engagement groove 21122, and a gas passage 2113 through which gas passes is provided between the plug 21113 and the engagement groove 21122, so that the joint 200 can communicate with the external atmosphere through the gas port 211. In use, the air port 211 remains closed while the infusion path 100 is connected to the first path 210 for the air evacuation and drainage process. So that the device remains in a fully closed state, with the bounce of the first receiving chamber 231 drawing the liquid gas and liquid in the infusion channel 100 into the connector. When the first channel 210 and the second channel 220 in the joint are sealed, the air port 211 is pulled upwards to open, so that the air in the joint can be exhausted to the external environment after being filtered from the air port 211 under the condition of thermal expansion. Preferably, the depth of the neutralized liquid medicine in the cavity where the air port 211 is accommodated is related to the sealing pressure of the first sealing cover 221 and the second sealing cover 211. Preferably, the depth of the neutralizing solution is set such that the liquid pressure of the gas port 211 is smaller than the sealing pressure of the first and second sealing caps 221 and 211.

According to a preferred embodiment, the outlet of the infusion set comprises both a needle tip and a connection port. When the liquid outlet of the infusion set is a needle tip, that is, the infusion channel 100 connected with the first connector 210 is a needle tip cavity, the shape of the first channel 210 is configured to match the shape of the needle tip. Through the arrangement mode, the device can adapt to exhaust of infusion sets with various different ports, the adaptability is stronger, more protection scenes are provided, and the protection effect is better.

Example 2

This embodiment is a further improvement of embodiment 1, and repeated contents are not described again.

An infusion set, comprising the residual liquid collecting device in embodiment 1.

Preferably, the infusion set comprises at least an infusion tube and a residual liquid collecting device, and the residual liquid collecting device is connected with the liquid outlet end of the infusion tube through a first channel 210 with a first shape. So as to assist the transfusion device to exhaust and drain liquid before injection. Preferably, the infusion set further comprises an infusion needle. The residual liquid collecting device is connected with the liquid outlet port of the infusion needle through a first channel 210 in a second shape so as to assist the infusion apparatus with the infusion needle to exhaust and discharge liquid before injection. Preferably, the first channel 210 is provided with a mating sealing cover. When the needle point or the infusion tube is separated from the first channel 210, the collecting device which is collected with gas and liquid can be sealed for the second time through the sealing cover, so that the volatilization and leakage risks of the liquid medicine are reduced, and the centralized treatment is facilitated. It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. A device for collecting injection residual liquid is characterized in that liquid to be input to a patient is sent from an infusion bottle to an indwelling needle or a needle point through an infusion channel (100) of an infusion tube,

it is characterized in that the preparation method is characterized in that,

the device comprises a joint (200) and a first containing cavity (231),

wherein the joint (200) comprises:

a first channel (210) for communicating with the infusion channel (100) of the infusion tube to collect gas and a small amount of liquid in the infusion channel (100);

a second passage (220) communicating with the first passage (210) and capable of controlling the connection to communicate with the external atmosphere; and

a third passage (230) communicating with the first passage (210) and the second passage (220) for connecting the first accommodation chamber (231);

wherein, when the infusion channel (100) is connected with the first channel (210) and the liquid in the infusion channel (100) approaches the first channel (210), the gas and part of the liquid in the infusion channel (100) enter the interior of the first channel (210) based on the rebound of the first accommodation chamber (231) in a pressed state, so that the liquid to be infused into the patient occupies the infusion channel (100) before infusion.

2. The device according to claim 1, characterized in that said second channel (220) is provided with a first sealing cap (221) able to close off the second channel (200) in such a way as to control the communication of said joint (200) with the external environment; the first channel (210) is provided with a second sealing cover (211) in a manner that the first channel (210) can be closed.

3. The device according to the preceding claim 2, wherein the first receiving chamber (231) comprises a seal (232) for preventing the gas in the first receiving chamber (231) from flowing out to the third channel (230), the seal (232) being connected with the inner wall of the third channel (230) in such a way that it can move along the third channel (230) towards the first channel (210) upon being pushed by the gas in the first receiving chamber (231).

4. A device according to claim 3, characterized in that the seal (232) is connected with the inner wall of the third channel (230) in a piston-cylinder movement fit.

5. The device according to claim 4, characterized in that the angle α between the central axis of the second channel (220) and the central axis of the first channel (210) is arranged to be larger than the angle β between the central axis of the second channel (220) and the third channel (230) in such a way that the gas and liquid in the infusion tube follow the first path.

6. The device according to the preceding claim 5, characterized in that, in the case where the joint (200) is sealed based on the first and second sealing covers (221, 211) and the joint (200) is expanded by the heated internal gas, the first channel (210) is provided with an openable and closable gas port (211) that can only be unidirectionally vented outwards to enable the first channel (210) to communicate with the external environment in such a way as to allow the gas inside the joint (200) to vent to the external environment to reduce the internal pressure of the joint (200), the gas port (211) being used to vent the gas inside the joint (200) to the external environment.

7. The device as claimed in claim 6, wherein the gas port (211) includes a gas passage and a filter portion, the gas in the connector (200) reaches the filter portion through the gas passage based on pressure, and is discharged to the outside through the filter portion after absorbing the toxic particles at the filter portion,

the air port (211) comprises a first part (2111) and a second part (2112), the first part (2111) and the second part (2112) are movably and airtightly connected with each other in a mode that the clamping degree of the first part (2111) and the second part (2112) can be changed by one hand and the opening and closing of the air port (211) are controlled, wherein,

the first part (2111) comprises a sealing plug consisting of a push rod (21112) and a plug head (21113), the second part (2112) comprises a clamping groove (21122) matched with the push rod (21112) and the plug head (21113) in shape, the plug head (21113) is connected to one end part of the push rod (21112), the other end part of the push rod (21112) opposite to the plug head (21113) is connected with the first channel (210), and the clamping groove (21122) and the plug head (21113) form a gas channel (2113) when clamping is released.

8. The device according to the preceding claim 7, characterized in that the second portion (2112) is provided with a filter portion in such a way that it is able to filter toxic particles from the gas discharged to the environment through the gas port (211), the filter portion comprising a neutralizing liquid drug (21124), the neutralizing liquid drug (21124) being provided between the gas channel (2113) and the environment in such a way that it is able to filter substantially the gas.

9. The device according to claim 8, wherein the height of the sealing member (232) is higher than the height of the air port (211) when the first receiving chamber (231) is not compressed by an external force.

10. The device according to claim 9, characterized in that the first part (2111) is provided with a first membrane (21111) in such a way that gas is allowed to flow out of the environment through the gas port (211) and liquid is not allowed to flow out, and that the second part (2112) is provided with a second membrane (21121) in such a way that neutralized medical liquid (21124) in the infusion set is prevented from entering the first part (2111).

11. An infusion set, characterized in that it comprises at least a device for collecting infusion residues according to claim 1.