A closed fluid transfer system

Abstract

The present invention discloses a closed fluid transfer system for use in the field of medical device technology. The system comprises 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 comprises a housing, a dual-channel needle seat, and a guide sleeve. The housing has a cavity therein. The upper end of the dual-channel needle seat is connected to the guide sleeve, and the lower end face abuts against the support surface of the cavity. The upper end of the housing is connected to the guide sleeve. The dual-channel needle seat comprises a fluid channel and a gas channel. The fluid channel connects the fluid channel of the container connection device and the cavity of the pressure supply device. The gas channel is provided with an oil-blocking and breathable membrane at one end away from the container connection device that can prevent the ingress and egress of fluid and allow the ingress and egress of external gas. The other end of the gas channel is connected to the fluid channel of the container connection device. The closed fluid transfer system can smoothly complete the fluid transfer operation.

Description

Technical Field

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

[0002] Dispensers involved in the preparation and management of hazardous fluids are vulnerable to exposure to hazardous fluids in the air and to hazardous fluid vapors that can spread into the surrounding environment. It should be noted that the term "hazardous fluid" refers to any injectable material with which contact or vapor can result in a health hazard. Illustrative and non-limiting examples of such fluids include, but are not limited to, cytotoxins, antivirals, chemotherapy fluids, antibiotics, and radiopharmaceuticals, such as Herceptin, cisplatinum, fluorouracil, leucovorin, taxol, metatroxat, gemcitabine hydrochloride for injection (gemzar), cyclophosphamide, cytoxan, and neosar, or any combination of the foregoing in liquid, solid, or vapor form.

[0003] Therein, hazardous fluids in liquid or powder form are contained in vials (first containers) and are usually prepared in a separate room by pharmacists who are provided with protective clothing, masks and laminar flow safety cabinets. The pharmacists use a syringe equipped with a cannula, i.e., a hollow injection needle, to transfer the hazardous fluid from the vial (first container), and the hazardous fluid is added to the corresponding solution.

[0004] Since hazardous fluids are toxic, direct physical contact with them or even exposure to tiny amounts of hazardous fluid vapor in the air can cause damage to the human body and increase the risk of physical illnesses such as skin cancer, leukemia, liver damage, deformities, miscarriage, and premature birth. In traditional hazardous fluid dispensing processes, locations where hazardous fluids are easily exposed to the air include when containers containing hazardous fluids (such as vials, bottles, syringes, and intravenous bags) are subjected to high pressure, resulting in exposure of hazardous fluids to contaminated air. Residual fluid solution on the needle tip, vial, or seal of an intravenous bag can also lead to exposure of hazardous fluids. Therefore, there is a need to provide a fluid dispensing device that prevents hazardous fluids from being easily exposed to the air or from coming into direct contact with the human body during the preparation process of hazardous fluids, so that the hazardous fluid preparation process can be completed in a sealed manner inside the dispensing device.

[0005] In existing technology, when a hazardous liquid is contained in a first container, the closed transfer of the hazardous fluid requires introducing gas from a second container into the first container. However, in actual clinical applications, the amount of gas in the second container is often too low, making it difficult to transfer hazardous fluids across multiple bottles.

[0006] At the same time, when there is negative pressure in the first container, there is also the possibility that the dangerous fluid transfer operation cannot be completed.

[0007] Secondly, the first adapter of the fluid preparation device and the pressure providing device are connected using a standard conical locking screw. In actual clinical application, improper operation may separate the first adapter from the pressure providing device, thereby causing leakage of dangerous fluid.

[0008] Furthermore, compared with the current clinical use of pressure supply devices to complete hazardous fluid operations, the operation is relatively complicated and has a higher risk of hazardous fluid leakage.

[0009] In summary, how to effectively solve the problem that existing fluid preparation devices are unable to complete hazardous fluid transfer operations is an issue that currently needs to be urgently addressed by those skilled in the art. Summary of the Invention

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

[0011] In order 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 connecting device and a pressure supply device, the two ends of the adapter are respectively connected to the container connecting device and the pressure supply device, the adapter includes an outer shell, a dual-channel needle seat and a guide sleeve, the outer shell has a cavity, the upper end of the dual-channel needle seat 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 includes a fluid channel and a gas channel, the fluid channel connects the fluid channel of the container connecting device and the cavity of the pressure supply device, the gas channel is provided with an oil-blocking and breathable membrane at the end away from the container connecting device, which can prevent the fluid from entering and exiting and allow external gas to enter and exit, and the other end of the gas channel is connected to the fluid channel of the container connecting device.

[0013] On the one hand, the gas channel includes a second fluid channel arranged in the guide sleeve and a fourth fluid channel arranged in the dual-channel needle seat, the lower end of the fourth fluid channel is flush with the bottom surface of the dual-channel needle seat, the oil-blocking and breathable membrane is fixed to the bottom surface of the dual-channel needle seat, and the end of the gas channel is in contact with the oil-blocking and 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 mounted 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, the lower end of the shell is connected to a connecting portion, the inner cavity channel is opened on the connecting portion, and the first channel column and the pressure supply device are respectively connected to the 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. 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 into the guide hole to seal the first channel column and the inner cavity channel. After the pressure supply device is tightened with the lower anti-screwing member, the sealing elastic body drives the lower locking portion and the upper locking portion 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, and 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, which 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 guide 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, and the side wall of the connecting sleeve is provided with a second protrusion engaged with the second plane and a third plane engaged with 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 part contacts the second plane of the upper anti-rotation part and the second protrusion of the lower anti-rotation part contacts the first protrusion of the upper anti-rotation part, the lower anti-rotation part and the upper anti-rotation part are radially fixed.

[0021] On the one hand, the first protrusion and the second protrusion are trapezoidal protrusions with a flat surface 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.

[0022] On the one hand, the guide sleeve and the dual-channel needle seat, as well as the guide sleeve and the outer shell are axially connected by undercuts and limit platforms, and the guide sleeve and the dual-channel needle seat, as well as the dual-channel needle seat and the outer shell are radially connected by limit shafts and limit holes, and the outer shell, the dual-channel needle seat and the guide sleeve are non-sealed connections.

[0023] The beneficial effect of the present invention is that the dual-channel needle seat includes a fluid channel, a gas channel and a dual-channel steel needle. One steel needle is connected to the fluid channel, and the other steel needle is connected to the gas channel. The two steel needles are independent passages. The fluid channel is responsible for connecting the fluid channel of the container connecting 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-proof and breathable membrane at the end away from the container connecting device, allowing external gas to enter and exit while preventing liquid from entering and exiting. The other end of the gas channel is connected to the fluid channel of the container connecting device, and external gas can flow freely in the system, helping to balance the pressure and reduce problems caused by pressure differences.

[0024] By applying the technical solution provided in the embodiment of the present invention, when transferring fluid, the system uses a pressure supply device to provide negative pressure or positive pressure. When the first container is in a negative pressure state or is not prone to deformation, external gas is allowed to enter and exit the first container through the gas channel, balancing the system pressure, reducing the problem of inability to complete fluid transfer due to pressure differences, ensuring that the fluid in the first container can be transferred to the second container through the fluid channel, completing the closed transfer operation of dangerous fluids, realizing efficient and safe transfer of fluids, and preventing fluid leakage and the intrusion of external contaminants. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

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

[0028] Figure 3 Schematic diagram of the structure of the upper anti-twist component;

[0029] Figure 4 is another structural schematic diagram of the upper anti-twist member;

[0030] Figure 5 Schematic diagram of the structure of the lower anti-twist component;

[0031] Figure 6 It is a structural diagram of a dual-channel needle seat;

[0032] Figure 7 is another structural schematic diagram of a dual-channel needle seat;

[0033] Figure 8 Schematic diagram of the structure of the oil-blocking breathable membrane;

[0034] Figure 9a is a cross-sectional view of a first container piercer;

[0035] Figure 9b Schematic diagram of the structure of the first container piercer;

[0036] Figure 10a is a front view of the second container piercer;

[0037] Figure 10b is a schematic structural diagram of a second container puncture device;

[0038] Figure 11 This is a schematic diagram of the structure of the second container piercer with a sealing plug;

[0039] Figure 12 This is a schematic diagram of the structure of the second container piercer without a sealing plug;

[0040] Figure 13a This is the main view of the conversion joint;

[0041] Figure 13b It is a structural diagram of the conversion joint;

[0042] Figure 14 This is a schematic diagram of the structure of the conversion joint with a sealing plug;

[0043] Figure 15 This is a schematic diagram of the structure of the conversion joint without a sealing plug;

[0044] Figure 16a This is an assembly diagram of the first container and the first container piercer;

[0045] Figure 16b This is a structural diagram of the assembly of the first container and the first container piercer;

[0046] Figure 17 This is an assembly diagram of the second container and the second container piercer;

[0047] Figure 18 This is the assembly diagram of the adapter and syringe;

[0048] Figure 19a The figure shows the assembly of the adapter and the first container piercer;

[0049] Figure 19b A cross-sectional view of the assembly of the adapter and the first container piercer;

[0050] Figure 20a The diagram shows the assembly of the adapter and the second container puncture device;

[0051] Figure 20b A cross-sectional view of the assembly of the adapter and the second container piercer;

[0052] Figure 21a Assembly drawing of adapter and conversion joint;

[0053] Figure 21b Assemble the adapter and conversion joint in a cross-section.

[0054] Reference numerals:

[0055] 1-second fluid channel; 2-limiting platform; 3-fourth fluid channel; 4-dual-channel needle seat; 5-oil-blocking breathable membrane; 6-lower anti-screwing member; 7-inner cavity channel; 8-sealing elastomer; 9-upper anti-screwing member; 10-third fluid channel; 11-first fluid channel; 12-first sealing member; 13-first container piercer; 14-second container piercer; 15-conversion joint; 16-syringe; 41-limiting hole; 42-welding surface; 43-first channel column; 61-second undercut; 62-third Plane; 63-second protrusion; 64-second channel column; 91-first undercut; 92-first plane; 93-guide hole; 94-limiting shaft; 95-support block; 96-second plane; 97-first protrusion; 131-fifth fluid channel; 132-sixth fluid channel; 141-eighth fluid channel; 142-seventh fluid channel; 143-first sealing plug; 144-sheath; 151-ninth fluid channel; 152-tenth fluid channel; 153-second sealing plug; 161-cavity. DETAILED DESCRIPTION

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

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection 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 in a specific embodiment of the present invention.

[0059] In a specific embodiment, the closed fluid transfer system provided by the present invention includes an adapter, a container connecting device and a pressure supply device, the two ends of the adapter are respectively connected to the container connecting device and the pressure supply device, the adapter includes 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 includes 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-resistant and breathable membrane 5 at the end away from the container connecting device, which can prevent liquid and other fluids from entering and exiting and allow external gas to enter and exit, and the other end of the gas channel is connected to the fluid channel of the container connecting device.

[0060] In the above structure, the container connecting device includes a puncture device or a conversion connector 15, and the puncture device is connected to the penicillin bottle or the stopper. The pressure supply device is part of the system, which is used to provide positive pressure or negative pressure to help the fluid flow in the system. The adapter is a key component connecting the container connecting device and the pressure supply device, and includes an outer shell, a dual-channel needle seat 4 and a guide jacket. There is a cavity inside the outer shell, and the upper end of the dual-channel needle seat 4 is connected to the guide jacket, and the lower end face abuts against the support surface of the cavity. The upper end of the outer shell is also connected to the guide jacket, and the adapter plays the role of a bridge in the system, realizing the connection between the outer shell, the dual-channel needle seat 4 and the guide jacket, and ensuring the smooth flow of fluid and gas.

[0061] The dual-channel needle seat 4 includes a fluid channel, a gas channel, and a dual-channel steel needle. One steel needle is connected to the fluid channel, and the other steel needle is connected to the gas channel. The upper end of the steel needle is 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 connecting device and the cavity 161 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-proof and breathable membrane 5 at the end away from the container connecting device, allowing external gas to enter and exit while preventing liquid from entering and exiting. The other end of the gas channel is connected to the fluid channel of the container connecting device, and external gas can flow freely in the system to help balance the pressure and reduce problems caused by pressure differences.

[0062] It should be noted that the oil-resistant and breathable membrane 5 is a common structure on the market. It is a special material, usually made of polytetrafluoroethylene or other materials, and has hydrophobic and oleophobic properties. 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] By applying the technical solution provided by the embodiments of the present invention, when transferring fluid, the system utilizes a pressure supply device to provide negative or positive pressure. When the first container is under negative pressure or is not easily deformed, external gas is allowed to enter and exit the first container through the gas channel, thereby balancing the system pressure and reducing the problem of fluid transfer failure due to pressure differences. This ensures that the fluid in the first container can be transferred to the second container through the fluid channel, allowing for closed transfer of hazardous fluids and achieving efficient and safe fluid transfer while preventing fluid leakage and the intrusion of external contaminants. The first container can be, but is not limited to, a vial, a bottle, a syringe, and an intravenous bag.

[0064] In a specific embodiment, a closed fluid transfer system operating method includes:

[0065] Step 1: Connect the first container piercer 13 to the first container, as shown in FIG. Figure 16a 、 Figure 16bAs shown, the second container piercer 14 is connected to the second container, as shown in FIG. Figure 17 shown.

[0066] The first container piercing device 13 is buckled and clamped with the first container bottle mouth. The structure of the first container piercing device 13 is as follows. Figure 9a 、 Figure 9b Remove the sheath 144 of the second container piercer 14 and connect it to the second container. The structure of the second container piercer 14 is as shown. Figure 10a 、 Figure 10b shown.

[0067] There are two modes of the second container piercer 14. In the first mode, the eighth fluid channel 141 and the seventh fluid channel 142 are not completely separated and are connected. The third sealing member is located at the head end 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 sealing member are two parts. The first sealing plug 143 can also be a single part with the third sealing member, such as Figure 11 shown.

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

[0069] In the second mode, the eighth fluid channel 141 and the seventh fluid channel 142 are completely separated and not connected, the third sealing member is located at the head end of the eighth fluid channel 141 and the seventh fluid channel 142, and the end of the eighth fluid channel 141 is not connected. Figure 12 shown.

[0070] When the second container piercer 14 is connected to the adapter, the opening of the second fluid channel 1 of the adapter will enter the eighth fluid channel 141, and the opening of the first fluid channel 11 of the adapter will enter the seventh fluid channel 142. Because 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 cannot communicate with the first fluid channel 11 of the adapter, and 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, such as Figure 18 shown.

[0072] After connection, the first fluid channel 11, the third fluid channel 10, and the inner cavity channel 7 of the adapter are connected to the cone head cavity 161 of the pressure supply device. At the same time, after the pressure supply device and the adapter are connected, the pressure supply device and the adapter cannot be separated due to the anti-screwing structure.

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

[0074] Step 3: Connect the adapter to the first container piercer 13, as shown in FIG. Figure 19a 、 Figure 19b shown.

[0075] Place the product upright with the bottle mouth of the first container facing downward, pull out the core rod of the pressure supply device, and the fluid enters the first fluid channel 11, the third fluid channel 10, and the inner cavity channel 7 of the adapter through the sixth fluid channel 132 of the first container piercer 13, and enters the cone head cavity 161 of the pressure supply device, thereby entering the pressure supply device. At the same time, the external gas enters the fifth fluid channel 131 of the first container piercer 13 through the oil-blocking and breathable membrane 5, the fourth fluid channel 3, and the second fluid channel 1 of the adapter, thereby entering the first container, achieving pressure balance in the first container.

[0076] Step 4: After extracting a fixed amount of fluid from the first container, separate the adapter from the first container piercer 13 .

[0077] Step 5: Connect the adapter to the second container piercer 14. Figure 20a 、 Figure 20b shown.

[0078] At this point, the front outlet of the adapter's second fluid channel 1 enters the first sealing plug 143 of the second container piercer 14, tightly encasing the front outlet of the second fluid channel 1 and sealing it. The pressure supply device's core rod is then pushed, and the fluid within the pressure supply device flows through the pressure supply device's conical lumen 161 into the adapter's internal channel 7, the third fluid channel 10, the first fluid channel 11, and into the seventh fluid channel 142 of the second container piercer 14, ultimately entering the second container, completing the fluid transfer.

[0079] The conical connector of the conversion connector 15 can be connected to the locking conical connector on the infusion set or the indwelling needle, and the adapter can also be connected to the conversion connector 15. At this time, the front outlet of the second fluid channel 1 of the adapter enters the second sealing plug 153 of the conversion connector 15, and the front outlet of the second fluid channel 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 channel 7, the third fluid channel 10, and the first fluid channel 11 of the adapter through the cone head cavity 161 of the pressure supply device, and enters the ninth fluid channel 151 of the conversion connector 15, thereby entering the infusion set or the indwelling needle, completing the fluid transfer, as shown in FIG. Figure 21a 、 Figure 21b shown.

[0080] There are two ways to convert the connector 15. In the first way, Figure 14 As shown, the ninth fluid channel 151 and the tenth fluid channel 152 are not completely separated and are connected in series, the fourth seal is located at the head end of the ninth fluid channel 151 and the tenth fluid channel 152, the second sealing plug 153 is used to seal the tenth fluid channel 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 conversion connector 15 is connected to the puncture adapter, the opening of the second fluid channel 1 of the puncture adapter will enter the sealing plug, and the opening of the first fluid channel 11 of the puncture adapter will enter the ninth fluid channel 151. Due to the effect of the sealing plug, the second fluid channel 1 of the puncture adapter and the first fluid channel 11 of the puncture adapter cannot communicate with each other, and the fluid in the first fluid channel 11 of the puncture adapter cannot enter the second fluid channel 1 of the puncture adapter.

[0082] In the second method, if Figure 15 As shown, the ninth fluid channel 151 and the tenth fluid channel 152 are completely separated and not connected, the fourth sealing member is located at the head end of the ninth fluid channel 151 and the tenth fluid channel 152, and the end of the tenth fluid channel 152 is blocked.

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

[0084] In the above embodiment, 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-mentioned specific embodiments, the gas channel includes a second fluid channel 1 arranged in the guide sleeve and a fourth fluid channel 3 arranged in 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, and the oil-blocking and breathable membrane 5 is fixed to the bottom surface of the dual-channel needle seat 4. The end of the gas channel is in contact with the oil-blocking and breathable 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 in the guide sleeve, and the fourth fluid channel 3 is located in the dual-channel needle seat 4, and the two together constitute a complete gas channel. The lower end of the fourth fluid channel 3 extends to the bottom surface of the dual-channel needle seat 4, and the oil-blocking breathable membrane 5 is fixed to the bottom surface of the dual-channel needle seat 4. The end face of the fourth fluid channel 3 just abuts against the oil-blocking breathable membrane 5, and the oil-blocking breathable membrane 5 blocks the end port of the gas channel. This connection method not only facilitates the installation of the oil-blocking breathable 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 breathable membrane 5 and the gas channel port. The oil-blocking breathable membrane 5 blocks the fluid from entering and exiting the gas channel while allowing the gas to pass through. This feature allows the system to prevent fluid circulation and the intrusion of external pollutants while maintaining gas circulation.

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

[0088] In a preferred embodiment, the end of the gas channel does not contact the oil-blocking breathable membrane 5, and there is a gap between the end of the gas channel and the oil-blocking breathable membrane 5. The bottom of the dual-channel needle seat 4 is provided with a cavity connected to the gas channel, and the oil-blocking breathable membrane is connected to the cavity through a sealing component, so that external gas can enter the cavity through the oil-blocking breathable membrane and then enter the gas channel.

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

[0090] Based on the above-mentioned specific embodiments, the fluid channel includes 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 center hole of the oil-blocking and breathable membrane 5 is mounted 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.

[0091] In one specific embodiment, the first fluid channel 11 is located within the guide sleeve and primarily functions to guide fluid flow. The third fluid channel 10 is disposed within the dual-channel needle hub 4 and is connected to the first fluid channel 11. The lower end of the third fluid channel 10 extends beyond the bottom surface of the dual-channel needle hub 4, forming a first channel column 43 that ensures the continuity and sealing of the fluid channel. The inner cavity channel 7 is located within the cavity of the outer shell and is connected to the third fluid channel 10. Together with the first and third fluid channels 11 and 10, it forms a complete fluid flow path.

[0092] The oil-blocking breathable membrane 5 has a hole in its center that matches the first channel column 43. The center hole of the breathable membrane is mounted on the first channel column 43. The outer peripheral bottom surface of the first channel column 43 and the outer peripheral bottom surface of the dual-channel needle seat 4 are welding surfaces 42. The oil-blocking breathable membrane 5 is fixed to the welding surface 42 of the dual-channel needle seat 4 by heat welding or ultrasonic welding, etc., to ensure that the oil-blocking breathable membrane 5 is firmly connected to the dual-channel needle seat 4 and the first channel column 43. The connection between the oil-blocking breathable membrane 5, the dual-channel needle seat 4 and the first channel column 43 adopts multi-point and multi-position connection inside and outside, which enhances the integrity and stability of the fixation of the oil-blocking breathable membrane 5, thereby ensuring the sealing between the end face of the fourth fluid channel 3 and the oil-blocking breathable membrane 5, preventing leakage, thereby balancing the pressure inside and outside the system through the gas channel and reducing problems caused by pressure differences.

[0093] Based on the above specific embodiments, 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 the two ends of the inner cavity channel 7.

[0094] In a specific embodiment, a connecting portion is designed at the lower end of the housing. The housing and the connecting portion can be integrally formed or separately connected. The connecting portion is used to connect the housing to the pressure supply device. An inner cavity channel 7 is opened on the connecting portion. This channel is 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 flow path. One end of the inner cavity channel 7 is connected to the first channel column 43, and the other end is connected to the pressure supply device. The pressure supply device is opposite to the first channel column 43 and is sealed by the connecting portion.

[0095] Based on the above structure, the adapter is connected to the pressure providing device through the connecting part, and the pressure providing device and the connecting part can be connected using a standard conical locking screw. The adapter and the pressure providing device are easy to connect and not easy to separate, preventing fluid leakage.

[0096] On the basis of the above-mentioned specific embodiments, the outer shell is an upper anti-rotation part 9 with a guide hole 93 on the bottom surface, and the connecting part is a lower anti-rotation part 6 with a connecting sleeve on the upper end. The connecting sleeve is connected to the guide hole 93, the upper anti-rotation part 9 has an upper locking part, and the lower anti-rotation part 6 has a lower locking part. The connecting sleeve moves axially along the guide hole 93 to disengage the axial positioning of the lower anti-rotation part 6 and the upper anti-rotation part 9, and then realizes the relative rotation of the lower anti-rotation part 6 and the upper anti-rotation part 9 so that the lower locking part and the upper locking part are locked with each other.

[0097] In one embodiment, a closed fluid transfer system has an anti-twist function and includes an upper anti-twist member 9 and a lower anti-twist member 6. The bottom surface of the housing has a guide hole 93, which corresponds to the upper anti-twist member 9. The upper anti-twist member 9 has an upper locking portion for interlocking with the lower locking portion of the lower anti-twist member 6. The connecting portion is the lower anti-twist member 6, which has a connecting sleeve at its upper end. The lower anti-twist member 6 has a lower locking portion for interlocking with the upper locking portion of the upper anti-twist member 9.

[0098] The connecting sleeve is connected to the guide hole 93 and moves axially along the guide hole 93. When the lower anti-rotation member 6 and the upper anti-rotation member 9 move axially and separate from the axial positioning component, the lower anti-rotation member 6 and the upper anti-rotation member 9 can rotate relative to each other in the circumferential direction. When 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 lock together, thereby fixing the position of the two components and preventing them from accidentally rotating or separating.

[0099] Illustratively, when the lower anti-screwing member 6 is threadedly connected to the syringe 16, the syringe 16 is pushed, and the threaded member of the syringe 16 pushes the lower anti-screwing member 6 to move inward in the upper anti-screwing member 9 until the lower locking portion contacts the upper locking portion. At this time, the axial positioning components of the lower anti-screwing member 6 and the upper anti-screwing member 9 are separated. At the same time, the thrust applied to the syringe 16 is maintained, and the syringe 16 is continued to be rotated, driving the lower anti-screwing member 6 to rotate until the lower locking portion of the lower anti-screwing member 6 and the upper locking portion of the upper anti-screwing member 9 are engaged with each other, the lower anti-screwing member 6 stops rotating, and the syringe 16 is continued to be rotated, and the syringe 16 and the lower anti-screwing member 6 are successfully tightened.

[0100] After the syringe 16 is successfully tightened onto 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, the syringe 16 is rotated in the opposite direction, causing the lower anti-rotation member 6 to rotate in the opposite direction. The lower locking portion of the lower anti-rotation member 6 contacts the guide surface of the upper locking portion of the upper anti-rotation member 9, causing the lower anti-rotation member 6 to move outward within the upper anti-rotation member 9, making it impossible to stop the lower anti-rotation member 6 from rotating, and thus achieving the state where the syringe 16 cannot be separated from the lower anti-rotation member 6.

[0101] The locking mechanism of the upper locking portion and the lower locking portion ensures the stability of the connection between the syringe 16 and the lower anti-rotation member 6, thereby preventing connection failure due to rotation.

[0102] Based on the above embodiments, the invention further includes a sealing elastic body 8, which is wrapped around the outer periphery of the first channel column 43 and the inner cavity channel 7 and is inserted into the guide hole 93 to seal the first channel column 43 and the inner cavity channel 7. After the pressure supply device is tightened with the lower anti-screwing member 6, the sealing elastic body 8 drives the lower locking portion and the upper locking portion to separate.

[0103] In a specific embodiment, the sealing elastomer 8 is wrapped around the outer periphery of the first channel column 43 and the inner cavity channel 7, and is inserted into the guide hole 93 to achieve a sealed connection between the first channel column 43 and the inner cavity channel 7, ensure the sealing of the fluid channel, and prevent fluid leakage.

[0104] Sealing elastomer 8 not only seals but also has elastic properties. When lower anti-twist member 6 moves into upper anti-twist member 9, sealing elastomer 8 is compressed. After the pressure supply device is tightened onto lower anti-twist member 6, the restoring force of sealing elastomer 8 drives lower anti-twist member 6 out of upper anti-twist member 9, separating the lower locking portion from the upper locking portion, thereby enabling rotation of syringe 16.

[0105] Sealing elastomer 8 is usually a rubber polymer that is polymerized through a chemical reaction during the vulcanization process. This material has good elasticity and sealing properties and can remain stable at high temperatures without melting and starting to decompose.

[0106] Based on the above embodiment, the combination of the sealing elastomer 8 and the anti-twisting structure not only provides a sealed connection, but also realizes the separation and locking of the locking portion through the compression and recovery of the sealing elastomer 8, thereby realizing the functionality of the syringe 16.

[0107] Based on the above-mentioned specific embodiments, a second channel column 64 is provided within the connecting sleeve. The inner wall of the second channel column 64 forms an inner cavity channel 7. A U-shaped sleeve with an open upper end is formed between the connecting sleeve and the outer wall of the second channel column 64. The lower portion 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 the bottom surface of the dual-channel needle hub 4. The bottom surface of the U-shaped sleeve and the bottom surface of the dual-channel needle hub 4 axially limit the initial position of the sealing elastic body 8, ensuring the sealing between the fluid channels and preventing fluid infiltration.

[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 movable 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 flat surface 92, which is perpendicular to the axis of the guide hole 93. This design helps ensure that the connecting sleeve is correctly positioned when inserted into the guide hole 93, and the second undercut 61 can effectively snap onto the first flat surface 92 to provide a stable fixation.

[0110] The upper portion of the connecting sleeve has a second undercut 61. When the connecting sleeve is inserted into the guide hole 93, the second undercut 61 engages with the first flat surface 92. This structural design provides a mechanical locking mechanism to ensure that the connecting sleeve is fixed in position within the guide hole 93 and prevent it from being displaced or falling off due to external forces.

[0111] 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, 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] On the basis of the above-mentioned specific embodiments, 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 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 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 part 6 contacts the second plane 96 of the upper anti-rotation part 9 and the second protrusion 63 of the lower anti-rotation part 6 contacts the first protrusion 97 of the upper anti-rotation part 9, the lower anti-rotation part 6 and the upper anti-rotation part 9 are radially fixed.

[0113] In a specific embodiment, in the initial state, the second undercut 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, and 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. The lower anti-rotation member 6 can rotate clockwise and counterclockwise in the upper anti-rotation member 9.

[0114] When the lower anti-screwing part 6 is connected to the threaded mouth of the syringe 16, it is necessary to push the syringe 16. The threaded mouth of the syringe 16 pushes the lower anti-screwing part 6 to move inward in the upper anti-screwing part 9 until the third plane 62 of the lower anti-screwing part 6 contacts the second plane 96 of the upper anti-screwing part 9. At this time, the second undercut 61 of the lower anti-screwing part 6 leaves the first plane 92 of the upper anti-screwing part 9. At the same time, maintain the thrust to the syringe 16 and rotate the syringe 16 clockwise, driving the lower anti-screwing part 6 to rotate clockwise until the lower anti-screwing part 6 and the upper anti-screwing part 9 are radially limited. The lower anti-screwing part 6 stops rotating, and the syringe 16 continues to rotate clockwise. The syringe 16 and the lower anti-screwing part 6 are successfully tightened.

[0115] Based on the above specific embodiments, the first protrusion 97 and the second protrusion 63 are trapezoidal protrusions with a flat 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.

[0116] In a specific embodiment, the second undercut 61 of the lower anti-rotation member 6 is released from the first flat surface 92 of the upper anti-rotation member 9. At the same time, the syringe 16 is rotated clockwise while maintaining the thrust applied to the syringe 16, driving the lower anti-rotation member 6 to rotate clockwise until the second trapezoidal protrusion vertical surface of the lower anti-rotation member 6 contacts the first trapezoidal protrusion vertical surface of the upper anti-rotation member 9, directly locking the lower anti-rotation member 6 radially and preventing relative rotation. The lower anti-rotation member 6 stops rotating, which provides high reliability. Continuing to rotate the syringe 16 clockwise, the syringe 16 is successfully tightened to the lower anti-rotation member 6.

[0117] After the syringe 16 is successfully tightened onto the lower anti-rotation member 6, the syringe 16 cannot be separated from the lower anti-rotation member 6. To separate the syringe 16 from the lower anti-rotation member 6, the syringe 16 needs to be rotated counterclockwise, causing 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 surfaces have a guiding function, and the contact between the inclined surfaces exerts opposing forces on the lower anti-rotation member 6 and the upper anti-rotation member 9, thereby causing the lower anti-rotation member 6 to move outward within the upper anti-rotation member 9, making it impossible to stop the lower anti-rotation member 6 from rotating. As a result, the syringe 16 cannot be separated from the lower anti-rotation member 6.

[0118] Based on the above-mentioned specific embodiments, the guide sleeve and the dual-channel needle seat 4, as well as the guide sleeve and the outer shell are axially connected through 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 through limit shafts and limit holes.

[0119] In a specific embodiment, the limit platform is used in conjunction with the undercut, which provides a physical stop. The undercut utilizes the interlocking protrusions and grooves on the plastic or metal parts to achieve connection, thereby preventing the parts from accidentally sliding or falling off in the axial direction. The undercut portion will match the corresponding groove or protrusion, such as the first undercut 91 of the housing snapping into the limit platform 2 of the guide sleeve, and the undercut of the dual-channel needle seat 4 snapping into the limit platform of the guide sleeve, thereby achieving axial locking, ensuring the correct axial position and fixation of the guide sleeve, dual-channel needle seat 4 and the housing, and preventing the guide sleeve or dual-channel needle seat 4 from sliding out or shifting in the axial direction.

[0120] The limiting shaft is fixed on one component, and the limiting hole is opened on the other component. When the two components are assembled, the limiting shaft is inserted into the limiting hole, such as the limiting shaft 94 of the shell is inserted into the limiting hole 41 of the dual-channel needle seat 4, and the limiting shaft of the dual-channel needle seat 4 is inserted into the limiting hole of the guide sleeve, thereby limiting the radial rotation between the guide sleeve and the dual-channel needle seat 4 and the radial rotation between the dual-channel needle seat 4 and the shell, ensuring that the relative positions between the guide sleeve and the dual-channel needle seat 4 and between the dual-channel needle seat 4 and the shell are fixed, preventing the components from moving or rotating in an uncontrolled direction.

[0121] Based on the above specific embodiments, the housing, the dual-channel needle seat 4 and the guide sleeve are non-sealedly connected.

[0122] In the above structure, the connection between the outer shell, the dual-channel needle seat 4 and the guide sleeve does not rely on sealing, but relies on the stability of the mechanical structure. The outer shell, the dual-channel needle seat 4 and the guide sleeve are not sealed, and external gas can enter and exit the cavity, and then enter and exit the gas channel, thereby achieving air pressure balance inside and outside the system.

[0123] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0124] The above describes in detail the closed fluid transfer system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art will be able to make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will instead be applied 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 connected to the container connecting device and the pressure supply device respectively, the adapter comprises a shell, a dual-channel needle seat (4) and a guide sleeve, the 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 shell is connected to the guide sleeve, the dual-channel needle seat (4) comprises a fluid channel and a gas channel, the fluid channel communicates with the fluid channel of the container connecting device and the cavity (161) of the pressure supply device, and the gas channel is provided with a fluid channel at the end away from the container connecting device that can prevent the fluid from entering the cavity. An oil-blocking and breathable membrane (5) is provided for allowing external gas to enter and exit, and the other end of the gas channel is connected to the fluid channel of the container connecting device, and the fluid channel includes a first fluid channel (11) provided on the guide sleeve, a third fluid channel (10) provided on the dual-channel needle seat (4), and an inner cavity channel (7) provided 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 center hole of the oil-blocking and breathable membrane (5) is mounted on the first channel column (43), and 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.

2. The closed fluid transfer system according to claim 1, characterized in that: The gas channel comprises a second fluid channel (1) provided on the guide sleeve and a fourth fluid channel (3) provided 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: 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 the 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-screwing part (9) with a guide hole (93) on the bottom surface, and the connecting part is a lower anti-screwing part (6) with a connecting sleeve on the upper end. The connecting sleeve is connected to the guide hole (93), the upper anti-screwing part (9) has an upper locking part, and the lower anti-screwing part (6) has a lower locking part. The connecting sleeve moves axially along the guide hole (93) to disengage the axial positioning of the lower anti-screwing part (6) and the upper anti-screwing part (9), and then realizes the relative rotation of the lower anti-screwing part (6) and the upper anti-screwing part (9) so that the lower locking part and the upper locking part are locked with each other.

6. The closed fluid transfer system according to claim 5, characterized in that: The sealing elastic body (8) is wrapped around the outer periphery of the first channel column (43) and 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). After the pressure supply device is tightened with the lower anti-screwing member (6), the sealing elastic body (8) drives the lower locking portion and the upper locking portion 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 elastomer (8) is connected to the U-shaped sleeve, and the upper end of the sealing elastomer (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), and 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 movable gap is reserved between the end face of the inner cavity channel (7) and the end face 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 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 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-screwing part (6) contacts the second plane (96) of the upper anti-screwing part (9), and the second protrusion (63) of the lower anti-screwing part (6) contacts the first protrusion (97) of the upper anti-screwing part (9), the lower anti-screwing part (6) and the upper anti-screwing part (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 a limit platform, 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 a limit shaft and a limit hole, and the outer shell, the dual-channel needle seat (4) and the guide sleeve are non-sealed connections.

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