Closed fluid transfer system

Abstract

The invention discloses a closed fluid transfer system which is applied to the technical field of medical instruments and comprises an adapter, a container connecting device and a pressure supply device, the two ends of the adapter are connected with the container connecting device and the pressure supply device respectively, the adapter comprises a shell, a double-channel needle seat and a guide outer sleeve, and a cavity is formed in the shell; the upper end of the double-channel needle seat is connected with the guide outer sleeve, the lower end face of the double-channel needle seat abuts against the supporting face of the cavity, the upper end of the shell is connected with the guide outer sleeve, and the double-channel needle seat comprises a fluid channel and a gas channel. One end, far away from the container connecting device, of the gas channel is provided with an oil-resistant breathable film capable of preventing fluid from entering and exiting and allowing external gas to enter and exit, and the other end of the gas channel is communicated with the fluid channel of the container connecting device. The closed fluid transfer system can smoothly complete fluid transfer operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a closed fluid transfer system. Background Art

[0002] Pharmacists involved in the preparation and management of hazardous fluids are prone to being harmed by exposure to hazardous fluids and their vapors in the air, and these hazardous fluid vapors can spread to the surrounding environment. It should be noted that "hazardous fluid" refers to any injectable material, and contact with the material or its vapor can cause health hazards. Exemplary and non-limiting examples of such fluids include, but are not limited to, cytotoxins, antiviral drugs, chemotherapy fluids, antibiotics, and radiopharmaceuticals, such as Herceptin, cisplatinum, fluorouracil, leucovorin, taxol, metatrexate, Gemzar for injection, cyclophosphamide, cytoxan, and Neosar for injection, or combinations of the above-listed fluids in liquid, solid, or gaseous forms.

[0003] Among them, the hazardous fluid in liquid or powder form is contained in an ampoule (the first container), and is usually prepared by a pharmacist provided with protective clothing, a mask, and a laminar flow safety cabinet in a separate room. The pharmacist uses a syringe equipped with a cannula, that is, a hollow injection needle, to transfer the hazardous fluid from the ampoule (the first container), and the hazardous fluid is added to the corresponding solution.

[0004] Since hazardous fluids are toxic, direct physical contact with hazardous fluids or even exposure to minute amounts of hazardous fluid vapors in the air can cause damage to the human body, increasing the risk of physical ailments such as skin cancer, leukemia, liver damage, deformities, miscarriages, and premature births. In the traditional process of preparing hazardous fluids, locations where hazardous fluids are likely to be exposed to the air include situations where containers containing hazardous fluids (such as ampoules, bottles, syringes, and intravenous injection bags) are over-pressurized, resulting in the exposure and contamination of the air by the hazardous fluids. Fluid solution residues on the needle tip, on the ampoule, or at the seal of the intravenous injection bag can also lead to the risk of exposure to hazardous fluids. Therefore, there is a need to provide a fluid preparation device that can avoid the easy exposure of hazardous fluids to the air or direct contact between hazardous fluids and the human body during the preparation process of hazardous fluids, so that the hazardous fluids can be prepared inside the dispensing device in a closed manner.

[0005] In the prior art, when a dangerous fluid in liquid form is contained in a first container, it is necessary to introduce the gas in a second container into the first container to complete the closed transfer operation of the dangerous fluid. During the actual clinical application process, since the amount of gas in the second container is often small, the multi-bottle transfer of the dangerous fluid cannot be completed.

[0006] At the same time, for the first container with negative pressure, the transfer operation of the dangerous fluid cannot be completed either.

[0007] Secondly, the first adapter of the fluid preparation device and the pressure supply device are connected by using a standard conical locking screw thread. During the actual clinical application process, misoperation may separate the first adapter from the pressure supply device, resulting in the leakage of the dangerous fluid.

[0008] Furthermore, compared with the current clinical use of the pressure supply device to complete the operation of the dangerous fluid, the operation is relatively complex, and the risk of leakage of the dangerous fluid is relatively high.

[0009] In summary, how to effectively solve the problems that the existing fluid preparation device cannot complete the transfer operation of the dangerous fluid, etc., is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0010] The object of the present invention is to provide a closed fluid transfer system, which can smoothly complete the fluid transfer operation.

[0011] To solve the above technical problems, the present invention provides the following technical solutions:

[0012] A closed fluid transfer system includes an adapter, a container connection device and a pressure supply device. The two ends of the adapter are respectively connected to the container connection device and the pressure supply device. The adapter includes a housing, a double-channel needle seat and a guiding outer sleeve. There is a cavity in the housing. The upper end of the double-channel needle seat is connected to the guiding outer sleeve and the lower end surface abuts against the supporting surface of the cavity. The upper end of the housing is connected to the guiding outer sleeve. The double-channel needle seat includes a fluid channel and a gas channel. The fluid channel communicates with the fluid channel of the container connection device and the cavity of the pressure supply device. The gas channel is provided with an oil-resistant breathable membrane at one end far from the container connection device that can prevent the fluid from entering and exiting and allow the outside gas to enter and exit. The other end of the gas channel communicates with the fluid channel of the container connection device.

[0013] On the one hand, the gas channel includes a second fluid channel provided in the guiding outer sleeve and a fourth fluid channel provided in the double-channel needle seat. The lower end of the fourth fluid channel is flush with the bottom surface of the double-channel needle seat. The oil-resistant breathable membrane is fixed to the bottom surface of the double-channel needle seat, and the end of the gas channel contacts the oil-resistant breathable membrane.

[0014] On the one hand, the fluid channel includes a first fluid channel arranged on the guide sleeve, a third fluid channel arranged on the dual-channel needle seat, and an inner cavity channel arranged on the outer shell, the lower end of the third fluid channel extends out of the bottom surface of the dual-channel needle seat to form a first channel column, the center hole of the oil-blocking and breathable membrane is sleeved on the first channel column, the oil-blocking and breathable membrane is connected to the bottom surface of the dual-channel needle seat and the first channel column by welding, a plurality of support blocks are provided on the support surface, and the bottom surface of the dual-channel needle seat abuts against the support blocks.

[0015] On the one hand, a connecting portion is connected to the lower end of the shell, the inner cavity channel is opened on the connecting portion, and the first channel column and the pressure supply device are respectively connected to two ends of the inner cavity channel.

[0016] On the one hand, the shell is an upper anti-rotation part with a guide hole on the bottom surface, and the connecting part is a lower anti-rotation part with a connecting sleeve on the upper end, the connecting sleeve is connected to the guide hole, the upper anti-rotation part has an upper locking part, and the lower anti-rotation part has a lower locking part, and the connecting sleeve moves axially along the guide hole to disengage the axial positioning of the lower anti-rotation part and the upper anti-rotation part, and then realizes the relative rotation of the lower anti-rotation part and the upper anti-rotation part so that the lower locking part and the upper locking part are locked with each other.

[0017] On the one hand, it also includes a sealing elastic body, which is wrapped around the first channel column and the outer periphery of the inner cavity channel and is sleeved in the guide hole to seal and connect the first channel column and the inner cavity channel, and after the pressure supply device is tightened with the lower anti-screwing member, the sealing elastic body drives the lower locking part and the upper locking part to separate;

[0018] A second channel column is provided in the connecting sleeve, the inner wall of the second channel column forms the inner cavity channel, a U-shaped sleeve with an opening at the upper end is formed between the connecting sleeve and the outer wall of the second channel column, the lower part of the sealing elastomer is connected to the U-shaped sleeve, and the upper end of the sealing elastomer abuts against the bottom surface of the dual-channel needle seat.

[0019] On the one hand, the inner side of the guide hole has a first plane, the first plane is perpendicular to the axis of the guide hole, the upper part of the connecting sleeve has a second undercut, the connecting sleeve is inserted into the guide hole and the second undercut is clamped on the first plane, and a moving gap is reserved between the end face of the inner cavity channel and the end face of the first channel column.

[0020] On the one hand, the inner side of the guiding hole has a second plane and a first protrusion connected to the second plane in the circumferential direction. The second plane is located below the first plane and parallel to the first plane. The first protrusion is higher than the second plane. The side wall of the connecting sleeve is provided with a second protrusion that is snap-connected to the second plane and a third plane that is snap-connected to the first protrusion. In the locked state, there is a gap between the first protrusion and the second protrusion. When the third plane of the lower anti-rotation member contacts the second plane of the upper anti-rotation member, and the second protrusion of the lower anti-rotation member contacts the first protrusion of the upper anti-rotation member, the lower anti-rotation member and the upper anti-rotation member are radially fixed.

[0021] On the one hand, the first protrusion and the second protrusion are trapezoidal protrusions with a plane at the top. One side surface of the trapezoidal protrusion is a vertical surface connecting the connected planes, and the other side surface is an inclined surface connecting the connected planes.

[0022] On the one hand, both between the guiding outer sleeve and the double-channel needle seat and between the guiding outer sleeve and the housing are axially connected by reverse buckles and limiting platforms. Both between the guiding outer sleeve and the double-channel needle seat and between the double-channel needle seat and the housing are radially connected by limiting shafts and limiting holes. The housing, the double-channel needle seat, and the guiding outer sleeve are non-sealed connections.

[0023] The beneficial effects of the present invention are as follows: The double-channel needle seat includes a fluid channel, a gas channel, and double-channel steel needles. One steel needle communicates with the fluid channel, and the other steel needle communicates with the gas channel. The two steel needles are independent passages. The fluid channel is responsible for connecting the fluid channel of the container connection device and the cavity of the pressure supply device to ensure that the fluid can be smoothly transferred from one container to another. The gas channel is provided with an oil-blocking breathable membrane at one end far from the container connection device, allowing external gas to enter and exit, while preventing liquid from entering and exiting. The other end of the gas channel communicates with the fluid channel of the container connection device, and the external gas can freely flow in the system to help balance the pressure and reduce problems caused by pressure differences.

[0024] Applying the technical solution provided by the embodiments of the present invention, when transferring fluid, the system uses the pressure supply device to provide negative pressure or positive pressure. When the first container is in a negative pressure state or is not easily deformed, it allows external gas to enter and exit the first container through the gas channel, balances the system pressure, reduces the problem that fluid transfer cannot be completed due to pressure differences, ensures that the fluid in the first container can be transferred to the second container through the fluid channel, can complete the closed transfer operation of dangerous fluids, realizes the efficient and safe transfer of fluids, and at the same time prevents fluid leakage and the intrusion of external pollutants. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 Structural schematic diagram of a closed fluid transfer system provided by a specific embodiment of the present invention;

[0027] Figure 2 Structural schematic diagram of a closed fluid transfer system provided by another specific embodiment of the present invention;

[0028] Figure 3 Structural schematic diagram of the upper anti-rotation and screwing member;

[0029] Figure 4 Another structural schematic diagram of the upper anti-rotation and screwing member;

[0030] Figure 5 Structural schematic diagram of the lower anti-rotation and screwing member;

[0031] Figure 6 Structural schematic diagram of the double-channel needle seat;

[0032] Figure 7 Another structural schematic diagram of the double-channel needle seat;

[0033] Figure 8 Structural schematic diagram of the oil-blocking and breathable membrane;

[0034] Figure 9a Cross-sectional view of the first container puncturer;

[0035] Figure 9b Structural schematic diagram of the first container puncturer;

[0036] Figure 10a Front view of the second container puncturer;

[0037] Figure 10b Structural schematic diagram of the second container puncturer;

[0038] Figure 11 Structural schematic diagram of the second container puncturer with a sealing plug;

[0039] Figure 12 Structural schematic diagram of the second container puncturer without a sealing plug;

[0040] Figure 13a Front view of the adapter;

[0041] Figure 13b Schematic diagram of the adapter

[0042] Figure 14 Schematic diagram of the adapter with a sealing plug

[0043] Figure 15 Schematic diagram of the adapter without a sealing plug

[0044] Figure 16a Assembly diagram of the first container and the first container puncture device

[0045] Figure 16b Assembly structure diagram of the first container and the first container puncture device

[0046] Figure 17 Assembly diagram of the second container and the second container puncture device

[0047] Figure 18 Assembly diagram of the adapter and the syringe

[0048] Figure 19a Assembly diagram of the adapter and the first container puncture device

[0049] Figure 19b Cross-sectional view of the assembly of the adapter and the first container puncture device

[0050] Figure 20a Assembly diagram of the adapter and the second container puncture device

[0051] Figure 20b Cross-sectional view of the assembly of the adapter and the second container puncture device

[0052] Figure 21a Assembly diagram of the adapter and the adapter

[0053] Figure 21b Cross-sectional view of the assembly of the adapter and the adapter

[0054] Reference numerals:

[0055] 1 - Second fluid passage; 2 - Limiting platform; 3 - Fourth fluid passage; 4 - Dual-channel needle seat; 5 - Oil-blocking and air-permeable membrane; 6 - Lower anti-rotation part; 7 - Inner cavity passage; 8 - Sealing elastomer; 9 - Upper anti-rotation part; 10 - Third fluid passage; 11 - First fluid passage; 12 - First seal; 13 - First container puncturer; 14 - Second container puncturer; 15 - Adapter; 16 - Syringe; 41 - Limiting hole; 42 - Welding surface; 43 - First channel column; 61 - Second reverse buckle; 62 - Third plane; 63 - Second protrusion; 64 - Second channel column; 91 - First reverse buckle; 92 - First plane; 93 - Guide hole; 94 - Limiting shaft; 95 - Support block; 96 - Second plane; 97 - First protrusion; 131 - Fifth fluid passage; 132 - Sixth fluid passage; 141 - Eighth fluid passage; 142 - Seventh fluid passage; 143 - First sealing plug; 144 - Sheath; 151 - Ninth fluid passage; 152 - Tenth fluid passage; 153 - Second sealing plug; 161 - Cavity channel. Detailed implementation manners

[0056] The core of the present invention is to provide a closed fluid transfer system, which can smoothly complete the fluid transfer operation.

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] Please refer to Figures 1 to 21b , which is a schematic diagram and connection diagram of a closed fluid transfer system provided by a specific implementation manner in the present invention.

[0059] In a specific implementation manner, the closed fluid transfer system provided by the present invention includes an adapter, a container connection device, and a pressure supply device. The two ends of the adapter are respectively connected to the container connection device and the pressure supply device. The adapter includes a housing, a dual-channel needle seat 4, and a guide outer sleeve. There is a cavity inside the housing. The upper end of the dual-channel needle seat 4 is connected to the guide outer sleeve and the lower end surface abuts against the support surface of the cavity. The upper end of the housing is connected to the guide outer sleeve. The dual-channel needle seat 4 includes a fluid passage and a gas passage. The fluid passage communicates with the fluid passage of the container connection device and the cavity channel 161 of the pressure supply device. The gas passage is provided with an oil-blocking and air-permeable membrane 5 at the end far from the container connection device, which can prevent the entry and exit of fluids such as liquids and allow the entry and exit of external gases. The other end of the gas passage communicates with the fluid passage of the container connection device.

[0060] In the above structure, the container connection device includes a puncture device or an adapter 15, and the puncture device is connected to a vial or a stopper. The pressure supply device is a part of the system and is used to provide positive pressure or negative pressure to assist the flow of fluid in the system. The adapter is a key component connecting the container connection device and the pressure supply device, and includes a housing, a dual-channel needle seat 4, and a guide sleeve. There is a cavity inside the housing. The upper end of the dual-channel needle seat 4 is connected to the guide sleeve, and the lower end surface abuts against the support surface of the cavity. The upper end of the housing is also connected to the guide sleeve. The adapter plays a bridging role in the system, realizing the connection of the housing, the dual-channel needle seat 4, and the guide sleeve, and ensuring the smooth flow of fluid and gas.

[0061] The dual-channel needle seat 4 includes a fluid channel, a gas channel, and dual-channel steel needles. One steel needle communicates with the fluid channel, and the other steel needle communicates with the gas channel. The upper ends of the steel needles are sealed by a first seal 12, and the two steel needles are independent passages. The fluid channel is responsible for connecting the fluid channel of the container connection device and the cavity 161 of the pressure supply device, ensuring that fluid can be smoothly transferred from one container to another. The gas channel is provided with an oil-resistant breathable membrane 5 at one end far from the container connection device, allowing external gas to enter and exit, while preventing liquid from entering and exiting. The other end of the gas channel communicates with the fluid channel of the container connection device, and external gas can freely flow in the system, helping to balance the pressure and reducing problems caused by pressure differences.

[0062] It should be noted that the oil-resistant breathable membrane 5 is a common structure on the market and is a special material, usually made of polytetrafluoroethylene or other materials, and has the characteristics of being hydrophobic and oleophobic. The microporous structure of this membrane allows gas molecules to pass through, while liquid molecules are blocked outside. In other words, it can effectively prevent liquid from entering and exiting, while allowing gas to pass through.

[0063] Applying the technical solution provided by the embodiment of the present invention, when transferring fluid, the system uses the pressure supply device to provide negative pressure or positive pressure. When the first container is in a negative pressure state or is not easily deformed, it allows external gas to enter and exit the first container through the gas channel, balances the system pressure, reduces the problem that fluid transfer cannot be completed due to pressure differences, ensures that the fluid in the first container can be transferred to the second container through the fluid channel, can complete the closed transfer operation of dangerous fluids, realizes the efficient and safe transfer of fluids, and at the same time prevents fluid leakage and the intrusion of external pollutants. The first container can be, but is not limited to, a tubular bottle, a bottle, a syringe, and an intravenous injection bag.

[0064] In a specific embodiment, the operation method of the closed fluid transfer system includes:

[0065] Step 1, connect the first container puncture device 13 to the first container, such as Figure 16a , Figure 16bAs shown, connect the second container puncturer 14 to the second container, as Figure 17 shown.

[0066] The reverse buckle of the first container puncturer 13 is clamped tightly to the bottle mouth of the first container. The structure of the first container puncturer 13 is as Figure 9a , Figure 9b shown. Remove the sheath 144 of the second container puncturer 14 and connect it to the second container. The structure of the second container puncturer 14 is as Figure 10a , Figure 10b shown.

[0067] There are two ways for the second container puncturer 14. In the first way, the eighth fluid channel 141 and the seventh fluid channel 142 are not completely separated and are in communication. The third seal is located at the head ends of the eighth fluid channel 141 and the seventh fluid channel 142. The first sealing plug 143 is used to block the eighth fluid channel 141. The first sealing plug 143 and the third seal are two components. The first sealing plug 143 can also be a single component with the third seal, as Figure 11 shown.

[0068] When the second container puncturer 14 is connected to the adapter, the opening part of the second fluid channel 1 of the adapter will enter the eighth fluid channel 141 and is sealed by the first sealing plug 143. The opening part of the first fluid channel 11 of the adapter will enter the seventh fluid channel 142. The second fluid channel 1 of the adapter and the first fluid channel 11 of the adapter cannot communicate with each other. The fluid in the first fluid channel 11 of the adapter cannot enter the second fluid channel 1 of the adapter, as Figure 12 shown.

[0069] In the second way, the eighth fluid channel 141 and the seventh fluid channel 142 are completely separated and do not communicate with each other. The third seal is located at the head ends of the eighth fluid channel 141 and the seventh fluid channel 142. The end of the eighth fluid channel 141 is blocked, as Figure 12 shown.

[0070] When the second container puncturer 14 is connected to the adapter, the opening part of the second fluid channel 1 of the adapter will enter the eighth fluid channel 141, and the opening part of the first fluid channel 11 of the adapter will enter the seventh fluid channel 142. Since the eighth fluid channel 141 and the seventh fluid channel 142 are completely separated and do not communicate with each other, the second fluid channel 1 of the adapter and the first fluid channel 11 of the adapter cannot communicate with each other. The fluid in the first fluid channel 11 of the adapter cannot enter the second fluid channel 1 of the adapter.

[0071] Step 2, connect the pressure supply device to the adapter, as Figure 18 shown.

[0072] The first fluid passage 11, the third fluid passage 10, and the inner cavity passage 7 of the connecting rear adapter communicate with the tapered head passage 161 of the pressure supply device. At the same time, after the pressure supply device is connected to the adapter, due to the anti-rotation structure, the pressure supply device and the adapter cannot be separated.

[0073] In a preferred embodiment, the pressure supply device can be, but is not limited to, a syringe 16. An annular groove is provided on the side wall of the push rod of the syringe 16, and a sealing ring is installed in the annular groove. The sealing ring is hermetically connected to the inner wall of the cylinder body to prevent fluid leakage.

[0074] Step three, connect the adapter to the first container puncturer 13, as Figure 19a , Figure 19b shown.

[0075] Hold the product vertically with the mouth of the first container facing downwards. Pull the core rod of the pressure supply device. The fluid enters the tapered head passage 161 of the pressure supply device through the sixth fluid passage 132 of the first container puncturer 13, the first fluid passage 11, the third fluid passage 10, and the inner cavity passage 7 of the adapter. At the same time, the outside air enters the fifth fluid passage 131 of the first container puncturer 13 through the oil-blocking and air-permeable membrane 5, the fourth fluid passage 3, and the second fluid passage 1 of the adapter, and then enters the first container, achieving pressure balance in the first container.

[0076] Step four, after extracting a quantitative amount of fluid from the first container, separate the adapter from the first container puncturer 13.

[0077] Step five, connect the adapter to the second container puncturer 14, as Figure 20a , Figure 20b shown.

[0078] At this time, the front end outlet of the second fluid passage 1 of the adapter enters the first sealing plug 143 of the second container puncturer 14, and the front end outlet of the second fluid passage 1 is tightly wrapped by the first sealing plug 143 and is in a closed state. Push the core rod of the pressure supply device. The fluid in the pressure supply device enters the second container through the tapered head passage 161 of the pressure supply device, the inner cavity passage 7, the third fluid passage 10, the first fluid passage 11 of the adapter, and the seventh fluid passage 142 of the second container puncturer 14, completing the fluid transfer.

[0079] The conical connector of the adapter 15 can be connected to the locking conical connector on the infusion set or indwelling needle, and the adapter can also be connected to the adapter 15. At this time, the front end outlet of the second fluid passage 1 of the adapter enters the second sealing plug 153 of the adapter 15, and the front end outlet of the second fluid passage 1 is tightly wrapped by the second sealing plug 153 and is in a closed state. Push the core rod of the pressure supply device, and the fluid in the pressure supply device enters the inner cavity passage 7 of the adapter, the third fluid passage 10, and the first fluid passage 11 through the conical cavity 161 of the pressure supply device, and then enters the ninth fluid passage 151 of the adapter 15, so as to enter the infusion set or indwelling needle, completing the fluid transfer, as Figure 21a , Figure 21b shown.

[0080] There are two ways for the adapter 15. In the first way, as Figure 14 shown, the ninth fluid passage 151 and the tenth fluid passage 152 are not completely separated and are in communication. The fourth seal is located at the head ends of the ninth fluid passage 151 and the tenth fluid passage 152. The second sealing plug 153 is used to block the tenth fluid passage 152. The second sealing plug 153 and the fourth seal are two components, and the second sealing plug 153 can also be a single component with the fourth seal.

[0081] When the adapter 15 is connected to the puncture adapter, the opening part of the second fluid passage 1 of the puncture adapter will enter the sealing plug, and the opening part of the first fluid passage 11 of the puncture adapter will enter the ninth fluid passage 151. Due to the effect of the sealing plug, the second fluid passage 1 of the puncture adapter and the first fluid passage 11 of the puncture adapter cannot communicate with each other, and the fluid in the first fluid passage 11 of the puncture adapter cannot enter the second fluid passage 1 of the puncture adapter.

[0082] In the second way, as Figure 15 shown, the ninth fluid passage 151 and the tenth fluid passage 152 are completely separated and not in communication. The fourth seal is located at the head ends of the ninth fluid passage 151 and the tenth fluid passage 152, and the end of the tenth fluid passage 152 is blocked.

[0083] When the adapter 15 is connected to the puncture adapter, the opening part of the second fluid passage 1 of the puncture adapter will enter the tenth fluid passage 152, and the opening part of the first fluid passage 11 of the puncture adapter will enter the ninth fluid passage 151. Since the ninth fluid passage 151 and the tenth fluid passage 152 are completely separated and not in communication, the second fluid passage 1 of the puncture adapter and the first fluid passage 11 of the puncture adapter cannot communicate with each other, and the fluid in the first fluid passage 11 of the puncture adapter cannot enter the second fluid passage 1 of the puncture adapter.

[0084] In the above embodiments, the fluid transfer operation is completed through a closed fluid transfer system, which is easy to operate, has smooth fluid transfer, is not prone to leakage, and is safe and efficient.

[0085] Based on the above specific embodiments, the gas channel includes a second fluid channel 1 provided in the guiding outer sleeve and a fourth fluid channel 3 provided in the double-channel needle holder 4. The lower end of the fourth fluid channel 3 is flush with the bottom surface of the double-channel needle holder 4. The oil-blocking and gas-permeable membrane 5 is fixed to the bottom surface of the double-channel needle holder 4, and the end of the gas channel contacts the oil-blocking and gas-permeable membrane 5.

[0086] In a specific embodiment, the second fluid channel 1 and the fourth fluid channel 3 are connected. The second fluid channel 1 is located inside the guiding outer sleeve, and the fourth fluid channel 3 is provided inside the double-channel needle holder 4. The two together form a complete gas channel. The lower end of the fourth fluid channel 3 extends to the bottom surface of the double-channel needle holder 4. The oil-blocking and gas-permeable membrane 5 is fixed to the bottom surface of the double-channel needle holder 4. The end face of the end of the fourth fluid channel 3 just abuts against the oil-blocking and gas-permeable membrane 5, and the oil-blocking and gas-permeable membrane 5 blocks the end port of the gas channel. This connection method not only facilitates the installation of the oil-blocking and gas-permeable membrane 5, but also helps to ensure that the end port of the gas channel is effectively blocked, ensuring the sealed connection between the oil-blocking and gas-permeable membrane 5 and the gas channel port. By blocking the fluid from entering and leaving the gas channel while allowing the gas to pass through, this characteristic enables the system to maintain gas circulation while preventing fluid circulation and the intrusion of external pollutants.

[0087] Based on the above structure, the design of the gas channel and the oil-blocking and gas-permeable membrane 5 can achieve the balance of the pressure difference inside and outside the system, reduce the problems caused by the pressure difference, ensure the smoothness of fluid transfer, and improve the transfer efficiency.

[0088] In a preferred embodiment, the end of the gas channel does not contact the oil-blocking and gas-permeable membrane 5. There is a gap between the end of the gas channel and the oil-blocking and gas-permeable membrane 5. A cavity communicating with the gas channel is provided at the bottom of the double-channel needle holder 4. The oil-blocking and gas-permeable membrane is connected to this cavity through a sealing member, so that the outside gas enters the cavity through the oil-blocking and gas-permeable membrane and then enters the gas channel.

[0089] Preferably, a support block 95 is provided on the support surface. The bottom surface of the double-channel needle holder 4 abuts against the support block 95. There is a space between the bottom surface of the double-channel needle holder 4 and the support surface of the cavity. The support surface of the cavity does not block the end port of the gas channel, keeping the gas channel unobstructed and facilitating the entry and exit of the outside gas into and out of the gas channel.

[0090] Based on the above various specific embodiments, the fluid channel includes a first fluid channel 11 provided in the guiding outer sleeve, a third fluid channel 10 provided in the double-channel needle holder 4, and an inner cavity channel 7 provided on the housing. The lower end of the third fluid channel 10 extends out of the bottom surface of the double-channel needle holder 4 to form a first channel post 43. The central hole of the oil-blocking and breathable membrane 5 is sleeved on the first channel post 43, and the oil-blocking and breathable membrane 5 is connected to the bottom surface of the double-channel needle holder 4 and the first channel post 43 by welding.

[0091] In a specific embodiment, the first fluid channel 11 is located inside the guiding outer sleeve, and its main function is to guide the fluid flow. The third fluid channel 10 is provided inside the double-channel needle holder 4 and is connected to the first fluid channel 11. The lower end of the third fluid channel 10 extends out of the bottom surface of the double-channel needle holder 4 to form a first channel post 43, ensuring the continuity and sealing of the fluid channel. The inner cavity channel 7 is located inside the cavity of the housing and is connected to the third fluid channel 10, jointly forming a complete fluid circulation path with the first fluid channel 11 and the third fluid channel 10.

[0092] There is a hole in the center of the oil-blocking and breathable membrane 5, which matches the first channel post 43. The central hole of the breathable membrane is sleeved on the first channel post 43. The outer peripheral bottom surface of the first channel post 43 and the outer peripheral bottom surface of the double-channel needle holder 4 are welding surfaces 42. The oil-blocking and breathable membrane 5 is fixed on the welding surface 42 of the double-channel needle holder 4 by means such as thermal welding or ultrasonic welding, ensuring the firm connection between the oil-blocking and breathable membrane 5, the double-channel needle holder 4, and the first channel post 43. The connection between the oil-blocking and breathable membrane 5, the double-channel needle holder 4, and the first channel post 43 adopts multi-point and multi-site connection inside and outside, enhancing the integrity and stability of the fixation of the oil-blocking and breathable membrane 5, thereby ensuring the sealing between the end face of the fourth fluid channel 3 and the oil-blocking and breathable membrane 5, preventing leakage, and thus balancing the pressure inside and outside the system through the gas channel and reducing problems caused by pressure differences.

[0093] Based on the above various specific embodiments, a connecting part is connected to the lower end of the housing. The inner cavity channel 7 is opened on the connecting part, and the first channel post 43 and the pressure supply device are respectively connected to both ends of the inner cavity channel 7.

[0094] In a specific embodiment, a connecting part is designed at the lower end of the housing. The housing and the connecting part can be integrally formed or separately connected. The connecting part is used to connect the housing to the pressure supply device. The inner cavity channel 7 is opened on the connecting part. This channel is a part of the fluid channel and is connected to the first fluid channel 11 and the third fluid channel 10 to form a complete fluid circulation path. One end of the inner cavity channel 7 is connected to the first channel post 43, and the other end is connected to the pressure supply device. The pressure supply device is opposite to the first channel post 43, and a sealed connection is achieved through the connecting part.

[0095] Based on the above structure, the adapter is connected to the pressure providing device through the connecting portion. The pressure providing device and the connecting portion can be connected using a standard tapered locking screw thread. The connection between the adapter and the pressure providing device is convenient and not easily separated, preventing fluid leakage.

[0096] Based on each of the above specific embodiments, the housing is the upper anti-rotation member 9 with a guiding hole 93 on the bottom surface, the connecting portion is the lower anti-rotation member 6 with a connecting sleeve at the upper end, the connecting sleeve is connected to the guiding hole 93, the upper anti-rotation member 9 has an upper locking portion, the lower anti-rotation member 6 has a lower locking portion, and the connecting sleeve axially moves along the guiding hole 93 so that the lower anti-rotation member 6 and the upper anti-rotation member 9 are axially positioned and separated, and then the lower anti-rotation member 6 and the upper anti-rotation member 9 rotate relative to each other so that the lower locking portion and the upper locking portion are locked with each other.

[0097] In a specific embodiment, the closed fluid transfer system has an anti-rotation function and includes an upper anti-rotation member 9 and a lower anti-rotation member 6. The bottom surface of the housing has a guiding hole 93, and the housing is equivalent to the upper anti-rotation member 9. The upper anti-rotation member 9 has an upper locking portion for locking with the lower locking portion of the lower anti-rotation member 6. The connecting portion is the lower anti-rotation member 6 with a connecting sleeve at the upper end. The lower anti-rotation member 6 has a lower locking portion for locking with the upper locking portion of the upper anti-rotation member 9.

[0098] The connecting sleeve is connected to the guiding hole 93, and the connecting sleeve axially moves along the guiding hole 93. When the lower anti-rotation member 6 and the upper anti-rotation member 9 axially move away from the axial positioning member, the lower anti-rotation member 6 and the upper anti-rotation member 9 can rotate circumferentially relative to each other. When rotated until the upper locking portion of the lower anti-rotation member 6 and the lower locking portion of the upper anti-rotation member 9 are aligned and locked with each other, the lower locking portion and the upper locking portion are locked together, thereby fixing the positions of the two components and preventing them from rotating or separating accidentally.

[0099] Exemplarily, when the lower anti-rotation member 6 is connected to the screw thread of the syringe 16, by pushing the syringe 16, the screw thread of the syringe 16 pushes the lower anti-rotation member 6 to move inward in the upper anti-rotation member 9 until the lower locking portion and the upper locking portion come into contact. At this time, the axial positioning members of the lower anti-rotation member 6 and the upper anti-rotation member 9 are separated. Meanwhile, while maintaining the thrust on the syringe 16, continue to rotate the syringe 16, driving the lower anti-rotation member 6 to rotate until the lower locking portion of the lower anti-rotation member 6 is engaged with the upper locking portion of the upper anti-rotation member 9, and the lower anti-rotation member 6 stops rotating. Continuing to rotate the syringe 16, the syringe 16 and the lower anti-rotation member 6 are successfully tightened.

[0100] After the syringe 16 is successfully tightened with the lower anti-rotation member 6, the syringe 16 cannot be separated from the lower anti-rotation member 6. When the syringe 16 is separated from the lower anti-rotation member 6, rotating the syringe 16 in the reverse direction drives the lower anti-rotation member 6 to rotate in the reverse direction. The lower locking portion of the lower anti-rotation member 6 contacts the guiding surface of the upper locking portion of the upper anti-rotation member 9, causing the lower anti-rotation member 6 to move outward in the upper anti-rotation member 9 and preventing the lower anti-rotation member 6 from stopping rotating, thus realizing that the syringe 16 cannot be separated from the lower anti-rotation member 6.

[0101] Through the locking mechanism of the upper locking portion and the lower locking portion, the stability of the connection between the syringe 16 and the lower anti-rotation member 6 is ensured, preventing connection failure caused by rotation.

[0102] Based on the above various specific embodiments, a sealing elastomer 8 is further included. The sealing elastomer 8 wraps around the outer periphery of the first channel column 43 and the inner cavity channel 7 and is sleeved in the guiding hole 93 to seal and connect the first channel column 43 and the inner cavity channel 7. After the pressure supply device is tightened with the lower anti-rotation member 6, the sealing elastomer 8 drives the separation of the lower locking portion and the upper locking portion.

[0103] In a specific embodiment, the sealing elastomer 8 wraps around the outer periphery of the first channel column 43 and the inner cavity channel 7 and is sleeved in the guiding hole 93 to achieve the sealed connection of the first channel column 43 and the inner cavity channel 7, ensuring the sealing of the fluid channel and preventing fluid leakage.

[0104] The sealing elastomer 8 not only has a sealing function but also has elasticity. When the lower anti-rotation member 6 moves into the upper anti-rotation member 9, the sealing elastomer 8 is compressed. After the pressure supply device is tightened with the lower anti-rotation member 6, the restoring force of the sealing elastomer 8 drives the lower anti-rotation member 6 to move outward from the upper anti-rotation member 9, and the lower locking portion and the upper locking portion are separated, thereby realizing the rotation of the syringe 16.

[0105] The sealing elastomer 8 is usually a rubber polymer that polymerizes through a chemical reaction during the vulcanization process. This material has good elasticity and sealing performance, can remain stable at high temperatures, and will not melt but start to decompose.

[0106] Based on the above embodiments, the combination of the sealing elastomer 8 and the anti-rotation structure not only provides a sealed connection but also realizes the separation and locking of the locking portions through the compression and restoration of the sealing elastomer 8, realizing the functionality of the syringe 16.

[0107] On the basis of the above-mentioned specific embodiments, a second channel column 64 is provided in the connecting sleeve, the inner wall of the second channel column 64 forms an inner cavity channel 7, a U-shaped sleeve with an opening at the upper end is formed between the connecting sleeve and the outer wall of the second channel column 64, and the lower part of the sealing elastic body 8 is connected to the U-shaped sleeve, providing stable support and fixation for the sealing elastic body 8. The upper end of the sealing elastic body 8 abuts against the bottom surface of the dual-channel needle seat 4, and the bottom surface of the U-shaped sleeve and the bottom surface of the dual-channel needle seat 4 axially limit the initial position of the sealing elastic body 8, ensuring the sealing between the fluid channels and preventing fluid penetration.

[0108] Based on the above-mentioned specific embodiments, the inner side of the guide hole 93 has a first plane 92, the first plane 92 is perpendicular to the axis of the guide hole 93, the upper part of the connecting sleeve has a second undercut 61, the connecting sleeve is inserted into the guide hole 93 and the second undercut 61 is clamped on the first plane 92, and a moving gap is reserved between the end face of the inner cavity channel 7 and the end face of the first channel column 43.

[0109] In a specific embodiment, the inner side of the guide hole 93 has a first plane 92, which is perpendicular to the axis of the guide hole 93. This design helps to ensure that the connecting sleeve can be correctly positioned when inserted into the guide hole 93, and the second undercut 61 can be effectively snapped onto the first plane 92 to provide a stable fixing effect.

[0110] The upper part of the connecting sleeve has a second undercut 61, and when the connecting sleeve is inserted into the guide hole 93, the second undercut 61 is clamped on the first plane 92. This structural design provides a mechanical locking mechanism to ensure that the position of the connecting sleeve in the guide hole 93 is fixed to prevent displacement or falling off due to external force.

[0111] A moving gap is reserved between the end surface of the inner cavity channel 7 and the end surface of the first channel column 43, allowing the lower anti-rotation member 6 to move a certain distance into the upper anti-rotation member 9, so that the second undercut 61 of the lower anti-rotation member 6 is separated from the first plane 92 of the upper anti-rotation member 9, thereby realizing the relative rotation of the lower anti-rotation member 6 and the upper anti-rotation member 9, and then the lower locking part and the upper locking part are locked to realize the successful tightening of the syringe 16 and the lower anti-rotation member 6.

[0112] Based on the above various specific embodiments, the inner side of the guiding hole 93 has a second plane 96 and a first protrusion 97 connected to the second plane 96 in the circumferential direction. The second plane 96 is located below the first plane 92 and parallel to the first plane 92. The first protrusion 97 is higher than the second plane 96. The side wall of the connecting sleeve is provided with a second protrusion 63 clamped with the second plane 96 and a third plane 62 clamped with the first protrusion 97. In the locked state, there is a gap between the first protrusion 97 and the second protrusion 63. When the third plane 62 of the lower anti-rotation member 6 contacts the second plane 96 of the upper anti-rotation member 9, and the second protrusion 63 of the lower anti-rotation member 6 contacts the first protrusion 97 of the upper anti-rotation member 9, the lower anti-rotation member 6 and the upper anti-rotation member 9 are radially fixed.

[0113] In a specific embodiment, in the initial state, the second reverse buckle 61 of the lower anti-rotation member 6 contacts the first plane 92 of the upper anti-rotation member 9, the third plane 62 of the lower anti-rotation member 6 does not contact the second plane 96 of the upper anti-rotation member 9, the second protrusion 63 of the lower anti-rotation member 6 does not contact the first protrusion 97 of the upper anti-rotation member 9, and the lower anti-rotation member 6 can rotate clockwise and counterclockwise within the upper anti-rotation member 9.

[0114] When the lower anti-rotation member 6 is screwed to the screw thread of the syringe 16, it is necessary to push the syringe 16. The screw thread of the syringe 16 pushes the lower anti-rotation member 6 to move inward within the upper anti-rotation member 9 until the third plane 62 of the lower anti-rotation member 6 contacts the second plane 96 of the upper anti-rotation member 9. At this time, the second reverse buckle 61 of the lower anti-rotation member 6 leaves the first plane 92 of the upper anti-rotation member 9. At the same time, while maintaining the thrust on the syringe 16, rotate the syringe 16 clockwise, driving the lower anti-rotation member 6 to rotate clockwise until the lower anti-rotation member 6 and the upper anti-rotation member 9 are radially limited, the lower anti-rotation member 6 stops rotating, and continue to rotate the syringe 16 clockwise, then the syringe 16 and the lower anti-rotation member 6 are successfully tightened.

[0115] Based on the above various specific embodiments, the first protrusion 97 and the second protrusion 63 are trapezoidal protrusions with a plane at the top. One side of the trapezoidal protrusion is a vertical plane connecting the connected planes, and the other side is an inclined plane connecting the connected planes.

[0116] In a specific embodiment, when the second reverse buckle 61 of the lower anti-rotation member 6 leaves the first plane 92 of the upper anti-rotation member 9, at the same time, while maintaining the thrust on the syringe 16, rotate the syringe 16 clockwise, driving the lower anti-rotation member 6 to rotate clockwise until the vertical plane of the second trapezoidal protrusion of the lower anti-rotation member 6 contacts the vertical plane of the first trapezoidal protrusion of the upper anti-rotation member 9, directly radially locked, and there is no possibility of relative rotation, the lower anti-rotation member 6 stops rotating, and the reliability is relatively high. Continue to rotate the syringe 16 clockwise, then the syringe 16 and the lower anti-rotation member 6 are successfully tightened.

[0117] After the syringe 16 is successfully tightened with the lower anti-rotation member 6, the syringe 16 cannot be separated from the lower anti-rotation member 6. When the syringe 16 is separated from the lower anti-rotation member 6, it is necessary to rotate the syringe 16 counterclockwise, driving the lower anti-rotation member 6 to rotate counterclockwise. The inclined surface of the second trapezoidal protrusion of the lower anti-rotation member 6 contacts the inclined surface of the first trapezoidal protrusion of the upper anti-rotation member 9. The inclined surface has a guiding effect. When the inclined surfaces are in extrusion contact, opposite acting forces are applied to the lower anti-rotation member 6 and the upper anti-rotation member 9, so that the lower anti-rotation member 6 moves outward in the upper anti-rotation member 9, and the lower anti-rotation member 6 cannot stop rotating, and the syringe 16 cannot be separated from the lower anti-rotation member 6.

[0118] Based on the above various specific embodiments, both between the guiding outer sleeve and the double-channel needle seat 4 and between the guiding outer sleeve and the housing are axially connected by reverse buckles and limiting platforms, and both between the guiding outer sleeve and the double-channel needle seat 4 and between the double-channel needle seat 4 and the housing are radially connected by limiting shafts and limiting holes.

[0119] In a specific embodiment, the limiting platform and the reverse buckle are used in combination. The limiting platform provides a physical stop block. The reverse buckle realizes the connection by the mutual engagement of the protrusions and grooves on the plastic or metal parts, which can prevent the accidental sliding or falling off of the parts in the axial direction. The reverse buckle part will match the corresponding groove or protrusion. For example, the first reverse buckle 91 of the housing is buckled on the limiting platform 2 of the guiding outer sleeve, and the reverse buckle of the double-channel needle seat 4 is buckled on the limiting platform of the guiding outer sleeve, realizing the locking in the axial direction, ensuring the correct position and fixation of the guiding outer sleeve, the double-channel needle seat 4 and the housing in the axial direction, and preventing the guiding outer sleeve or the double-channel needle seat 4 from sliding out or shifting in the axial direction.

[0120] The limiting shaft is fixed on one part, and the limiting hole is opened on the other part. When the two parts are assembled, the limiting shaft is inserted into the limiting hole. For example, the limiting shaft 94 of the housing is snapped into the limiting hole 41 of the double-channel needle seat 4, and the limiting shaft of the double-channel needle seat 4 is snapped into the limiting hole of the guiding outer sleeve, thereby restricting the radial rotation between the guiding outer sleeve and the double-channel needle seat 4 and the radial rotation between the double-channel needle seat 4 and the housing, ensuring the relative position fixation between the guiding outer sleeve and the double-channel needle seat 4 and between the double-channel needle seat 4 and the housing, and preventing the parts from moving or rotating in an uncontrolled direction.

[0121] Based on the above various specific embodiments, the housing, the double-channel needle seat 4 and the guiding outer sleeve are non-sealed connections.

[0122] In the above structure, the connection between the housing, the double-channel needle seat 4 and the guiding outer sleeve does not depend on the sealing property, but depends on the stability of the mechanical structure. The housing, the double-channel needle seat 4 and the guiding outer sleeve are non-sealed connections, and the outside gas can enter and exit the cavity, and then enter and exit the gas channel, realizing the air pressure balance inside and outside the system.

[0123] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0124] The above has introduced in detail the closed fluid transfer system provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A closed fluid transfer system, characterized in that: The invention comprises an adapter, a container connecting device and a pressure supply device, wherein the two ends of the adapter are respectively connected to the container connecting device and the pressure supply device, the adapter comprises an outer shell, a dual-channel needle seat (4) and a guide sleeve, the outer shell has a cavity, the upper end of the dual-channel needle seat (4) is connected to the guide sleeve and the lower end face abuts against the support surface of the cavity, the upper end of the outer shell is connected to the guide sleeve, the dual-channel needle seat (4) comprises a fluid channel and a gas channel, the fluid channel connects the fluid channel of the container connecting device and the cavity (161) of the pressure supply device, the gas channel is provided with an oil-blocking and breathable membrane (5) capable of preventing the fluid from entering and exiting and allowing the outside gas to enter and exit at one end away from the container connecting device, and the other end of the gas channel is connected to the fluid channel of the container connecting device.

2. The closed fluid transfer system according to claim 1, characterized in that: The gas channel comprises a second fluid channel (1) arranged on the guide sleeve, and a fourth fluid channel (3) arranged on the dual-channel needle seat (4); the lower end of the fourth fluid channel (3) is flush with the bottom surface of the dual-channel needle seat (4); the oil-blocking and breathable membrane (5) is fixed to the bottom surface of the dual-channel needle seat (4); and the end of the gas channel is in contact with the oil-blocking and breathable membrane (5).

3. The closed fluid transfer system according to claim 2, characterized in that: The fluid channel comprises a first fluid channel (11) arranged on the guide sleeve, a third fluid channel (10) arranged on the dual-channel needle seat (4), and an inner cavity channel (7) arranged on the outer shell, the lower end of the third fluid channel (10) extends out of the bottom surface of the dual-channel needle seat (4) to form a first channel column (43), the central hole of the oil-blocking and breathable membrane (5) is sleeved on the first channel column (43), the oil-blocking and breathable membrane (5) is connected to the bottom surface of the dual-channel needle seat (4) and the first channel column (43) by welding, and a plurality of support blocks (95) are provided on the support surface, and the bottom surface of the dual-channel needle seat (4) abuts against the support blocks (95).

4. The closed fluid transfer system according to claim 3, characterized in that: The lower end of the shell is connected to a connecting portion, the inner cavity channel (7) is opened on the connecting portion, and the first channel column (43) and the pressure supply device are respectively connected to two ends of the inner cavity channel (7).

5. The closed fluid transfer system according to claim 4, characterized in that: The shell is an upper anti-rotation component (9) having a guide hole (93) on the bottom surface, and the connecting portion is a lower anti-rotation component (6) having a connecting sleeve on the upper end, the connecting sleeve being connected to the guide hole (93), the upper anti-rotation component (9) having an upper locking portion, the lower anti-rotation component (6) having a lower locking portion, the connecting sleeve moving axially along the guide hole (93) to disengage the axial positioning of the lower anti-rotation component (6) and the upper anti-rotation component (9), and then realizing relative rotation of the lower anti-rotation component (6) and the upper anti-rotation component (9) so that the lower locking portion and the upper locking portion are locked with each other.

6. The closed fluid transfer system according to claim 5, characterized in that: It also includes a sealing elastic body (8), the sealing elastic body (8) is wrapped around the first channel column (43) and the outer periphery of the inner cavity channel (7) and is sleeved in the guide hole (93) to seal the first channel column (43) and the inner cavity channel (7), and after the pressure supply device and the lower anti-screwing member (6) are tightened, the sealing elastic body (8) drives the lower locking part and the upper locking part to separate; A second channel column (64) is provided in the connecting sleeve, the inner wall of the second channel column (64) forms the inner cavity channel (7), a U-shaped sleeve with an opening at the upper end is formed between the connecting sleeve and the outer wall of the second channel column (64), the lower part of the sealing elastic body (8) is connected to the U-shaped sleeve, and the upper end of the sealing elastic body (8) abuts against the bottom surface of the dual-channel needle seat (4).

7. The closed fluid transfer system according to claim 5, characterized in that: The inner side of the guide hole (93) has a first plane (92), the first plane (92) is perpendicular to the axis of the guide hole (93), the upper part of the connecting sleeve has a second undercut (61), the connecting sleeve is inserted into the guide hole (93) and the second undercut (61) is snapped onto the first plane (92), and a movable gap is reserved between the end surface of the inner cavity channel (7) and the end surface of the first channel column (43).

8. The closed fluid transfer system according to claim 7, characterized in that: The inner side of the guide hole (93) has a second plane (96) and a first protrusion (97) connected to the second plane (96) in the circumferential direction, the second plane (96) is located below the first plane (92) and is parallel to the first plane (92), the first protrusion (97) is higher than the second plane (96), the side wall of the connecting sleeve is provided with a second protrusion (63) engaged with the second plane (96) and a third plane (62) engaged with the first protrusion (97), in a locked state, a gap is provided between the first protrusion (97) and the second protrusion (63), when the third plane (62) of the lower anti-rotation member (6) contacts the second plane (96) of the upper anti-rotation member (9), and the second protrusion (63) of the lower anti-rotation member (6) contacts the first protrusion (97) of the upper anti-rotation member (9), the lower anti-rotation member (6) and the upper anti-rotation member (9) are radially fixed.

9. The closed fluid transfer system according to claim 8, characterized in that: The first protrusion (97) and the second protrusion (63) are trapezoidal protrusions with a plane at the top, one side of the trapezoidal protrusion is a vertical surface connecting the connected planes, and the other side is an inclined surface connecting the connected planes.

10. The closed fluid transfer system according to any one of claims 1 to 9, characterized in that: The guide sleeve and the dual-channel needle seat (4) as well as the guide sleeve and the outer shell are axially connected via undercuts and limit platforms, and the guide sleeve and the dual-channel needle seat (4) as well as the dual-channel needle seat (4) and the outer shell are radially connected via limit shafts and limit holes, and the outer shell, the dual-channel needle seat (4) and the guide sleeve are non-sealedly connected.

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