Fluid transfer device

Abstract

The utility model provides a fluid transfer device which comprises a base body and a plurality of container connecting pieces. A first fluid channel communicated with the corresponding container is arranged in each container connecting piece; an injector connecting piece is rotationally mounted in the base body, and a second fluid channel is formed in the injector connecting piece; the injector connecting piece can be rotationally switched among a plurality of operation positions, so that the second fluid channel is communicated with the first fluid channels of different container connecting pieces; the positioning mechanism is arranged between the base body and the injector connecting piece and used for positioning the injector connecting piece rotating to the operation position, so that an operator can quickly and accurately determine whether the injector connecting piece is in place or not, and the operation experience feeling is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of solution configuration, and in particular relates to a fluid transfer device. Background Art

[0002] In the fields of chemistry and medicine, it is often necessary to mix multiple components to form a solution. Conventional component mixing operations usually involve pouring the components into a blender for mixing, but the components will be fully exposed to the air during the transfer and mixing process, and are easily denatured or contaminated; and when some components are toxic, they are also very easy to escape into the air, thereby damaging the health of nearby people.

[0003] In order to reduce the contamination, denaturation and escape of components during the transfer and mixing process, syringes are usually used for component transfer and mixing. For example, medical staff use syringes to mix and dispense medicines. The process of syringe mixing and dispensing medicines is as follows: use a syringe with a needle to extract a fluid component from a container, and inject the extracted fluid component into a container containing solid components such as powder components or freeze-dried components to mix and form a solution, and then use the syringe to extract the mixed solution; or use a syringe with a needle to extract the fluid components from multiple containers in turn and then shake them manually. Since the syringe needs to be docked with multiple containers separately for multiple fluid transfers, it not only has the problem of cumbersome operation, but also increases the risk of fluid denaturation and leakage.

[0004] In order to achieve aseptic transfer of fluids, liquid medicine transfer devices came into being. The liquid medicine transfer device can dock with a syringe and multiple containers carrying drug components at the same time. It docks the syringe with different containers by rotating the fluid control part, thereby achieving multiple transfers of fluids under relatively closed conditions, so as to transfer the drug components in each container to the syringe and mix them into the required liquid medicine. However, when the operator rotates the fluid control part to switch the position, it is impossible to accurately determine whether the fluid control part has been rotated into place, and repeated observation and debugging are required, which not only affects the operator's experience, but also affects the efficiency of solution preparation. Utility Model Content

[0005] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a fluid transfer device, which can position the syringe connector rotated to the operating position to produce a sense of click, so that the operator can quickly and accurately determine whether the syringe connector is rotated into place, thereby improving the operator's experience.

[0006] To achieve the above and other related purposes, the present utility model provides a fluid transfer device, which includes a base body and a plurality of container connectors arranged on the base body; a first fluid passage communicating with the corresponding container is provided in each container connector; a syringe connector is rotatably installed in the base body, and a second fluid passage communicating with the syringe is provided on the syringe connector; the syringe connector can be rotated and switched between a plurality of operating positions so that the second fluid passage communicates with the first fluid passages of different container connectors; a positioning mechanism is provided between the base body and the syringe connector, and the positioning mechanism is used to position the syringe connector rotated to the operating position; the positioning mechanism includes a first friction surface provided on the base body and a second friction surface provided on the syringe connector; when the syringe connector rotates to the operating position, the second friction surface contacts the first friction surface to generate a frictional force that restricts the rotation of the syringe connector. This frictional force can not only increase the rotation difficulty for the operator to remind the operator that the syringe has rotated in place, but also position and hold the syringe connector to prevent it from shifting during the fluid transfer process, ensuring the smooth completion of the fluid transfer at this operating position.

[0007] Preferably, the positioning mechanism further includes a first positioning member provided on the internal installation cavity and a second positioning member provided on the outer wall of the syringe connector; one of the first positioning member and the second positioning member is a positioning protrusion, and the other is a positioning groove that cooperates with the positioning protrusion to engage or disengage; when the positioning protrusion enters the positioning groove, a "click" sound will appear to remind the operator that the rotation is in place; at the same time, when the positioning protrusion cooperates with the positioning groove, a jamming feeling will be generated to give a secondary reminder to the operator.

[0008] Preferably, a clamping mechanism coaxial with the container connector is provided on the base body; the clamping mechanism is used to clamp or release the container to ensure the stability of the container.

[0009] Preferably, the clamping mechanism includes a plurality of clamping members distributed in a circumferential manner with the container connector as the center, and each clamping member encloses a clamping space for clamping the container; the clamping member includes a cantilever portion and a limiting portion located at the free end of the cantilever portion; each limiting portion cooperates to form an anti-detachment mechanism to prevent the container from detaching from the clamping space.

[0010] Preferably, the limiting portion includes a first guiding surface for stopping the container; when the container is moved out of the clamping space, it squeezes the first guiding surface of the limiting portion, so that the limiting portion rotates away from the container, thereby enabling the container to be smoothly moved out of the clamping space.

[0011] Preferably, the limiting portion includes a second guiding surface, and when the container is moved into the clamping space, it squeezes the second guiding surface, so that the limiting portion rotates away from the container to guide the container to smoothly enter the clamping space.

[0012] Preferably, the clamping mechanism includes a plurality of guiding members that are circumferentially distributed around the container connecting member, and the clamping members and the guiding members are alternately distributed on the same circumference; each guiding member includes a cantilever portion and a guiding portion located at the free end of the cantilever portion, and the guiding portion includes a third guiding surface; when the container is moved into the clamping space, the third guiding surface is squeezed, so that the guiding portion rotates away from the container.

[0013] Preferably, the clamping mechanism includes a stop mechanism for preventing the container from tilting; the stop mechanism cooperates with the limiting portion of the clamping member to limit the axial position of the container.

[0014] Preferably, the container connecting member is a puncture tube, and a drainage port communicating with the first fluid passage is formed on the outer wall of the puncture tube near the puncture end, so that when the container is inverted, the remaining liquid below the puncture end can flow out along the drainage port, avoiding waste of the liquid medicine.

[0015] As described above, a fluid transfer device of the present invention has the following beneficial effects:

[0016] 1) The fluid transfer device of the present invention can connect a syringe with a plurality of containers respectively to perform multiple fluid transfers in a relatively closed environment, so as to mix the components to be prepared carried in each container into a required prepared solution and store the prepared solution in the syringe for subsequent injection use; since the fluid transfer between the syringe and each container is carried out in a closed environment, the risk of fluid denaturation and leakage is effectively reduced, ensuring the safety of the operator.

[0017] 2) The provided positioning mechanism can position and hold the syringe connecting member rotated to each operating position and provide auditory and / or tactile feedback when rotated to the operating position, so that the operator can accurately sense the position state of the syringe connecting member, improving the operator's experience; at the same time, the syringe connecting member positioned and held at the operating position is not prone to accidental rotation, ensuring the smooth completion of the fluid transfer at this operating position.

[0018] 3) The container connecting member is a puncture tube with a puncture end, and a drainage port communicating with the first fluid passage is formed on the outer wall of the puncture tube near the puncture end, so that when the container is inverted, the remaining liquid below the puncture end can flow out along the drainage port, avoiding waste of the liquid medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the fluid transfer device.

[0020] Figure 2 is an exploded perspective view of the fluid transfer device.

[0021] Figure 3Isometric view of the fluid transfer device after removing the syringe connector and the handle.

[0022] Figure 4 Is Figure 3 Isometric sectional view of

[0023] Figure 5 Isometric assembly view of the syringe connector and the handle

[0024] Figure 6 Is Figure 5 Isometric sectional view of

[0025] Figure 7 Is the top view of the fluid transfer device.

[0026] Figure 8 Is Figure 7 Sectional view taken along line A-A of

[0027] Figure 9 Is Figure 7 Sectional view taken along line B-B of

[0028] Figure 10 Is a schematic structural view of the positioning mechanism positioning the syringe connector to a certain operating position.

[0029] Explanation of reference numerals

[0030] Base body 10, internal installation cavity 11, rotating installation cavity 11a, positioning installation cavity 11b, annular clamping block 111, internal container connector 20, first fluid channel 21, drainage port 22, syringe connector 30, first rotating shaft 30a, second rotating shaft 30b, syringe connection head 30c, second fluid channel 31, annular clamping groove 32, positioning protrusion 41, positioning groove 42, first friction surface 43, second friction surface 44, clamping mechanism 50, clamping member 51a, guiding member 51b, cantilever portion 511, limiting portion 512, first guiding surface 5121, second guiding surface 5122, guiding portion 513, third guiding surface 5131, enclosing portion 514, stop member 52, handle 60. Detailed implementation manners

[0031] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0032] Please refer to Figures 1 to 10It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have technical substantial significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the efficacy that the present utility model can produce and the purpose that can be achieved, should still fall within the scope that the technical content disclosed by the present utility model can cover. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the implementation scope of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the implementable scope of the present utility model.

[0033] The present utility model provides a fluid transfer device for connecting a syringe and multiple containers carrying components to be mixed. The fluid transfer device can transfer the components to be mixed in each container into the syringe in a relatively airtight environment for mixing and preparing the required solution; as Figure 1 , Figure 4 , Figure 6 , Figure 7 and Figure 8 shown, the fluid transfer device includes a base body 10 having an internal installation cavity 11, an injection connector 30 that can rotate self - sufficiently in the internal installation cavity 11, and multiple container connectors 20 arranged on the outer wall of the base body 10; wherein, the container connector 20 is provided with a first fluid channel 21 communicating with the internal installation cavity 11, and the container connector 20 is used to connect the container carrying the components to be mixed; the injection connector 30 is provided with a second fluid channel, and the injection connector 30 is used to connect the syringe (not shown in the figure); when the syringe connector 30 rotates self - sufficiently in the internal installation cavity 11, it can rotate and switch between multiple operation positions to make the second fluid channel 31 communicate with the first fluid channels 21 of different container connectors 20; thus, the components to be mixed in each container can be introduced into the syringe in a relatively airtight environment for mixing.

[0034] In actual operation, the operation steps of the fluid transfer device need to be determined according to whether there are solid components such as powder components or freeze-dried components among the various components to be mixed involved in the solution to be prepared. For example, when the various components to be mixed involved in the solution to be prepared are all liquid components, the injection connector 30 needs to be rotated to the operating position connected to each container in turn according to the component mixing order requirement, and the components to be mixed in the corresponding container are sucked into the syringe at the operating position. When the components to be mixed in all containers are sucked into the syringe, the solution preparation can be completed; for example, when the various components to be mixed involved in the solution to be prepared include liquid components and solid components (such as solid components such as powders and freeze-dried components), it is necessary to first determine the container where the liquid component for diluting the solid component is located, and rotate the injection connector 30 to the operating position connected to the container to absorb the liquid component in the corresponding container, and then rotate the injection connector 30 to the operating position connected to the container containing the solid component to push the liquid component in the syringe into the container where the solid component is located for dissolution and mixing, and then suck the mixed liquid into the syringe to complete the solution preparation or continue to rotate to other operating positions to absorb liquid components from other containers to complete the solution preparation.

[0035] In this application, for the sake of convenience, the height direction of the syringe connector 30 in the fluid transfer device in a horizontal state is defined as the up-down direction, the axial direction of the syringe connector 30 in a horizontal state is defined as the front-back direction, and the direction perpendicular to both the up-down direction and the front-back direction is defined as the left-right direction. Figure 9 In the figure, the upper side and the lower side of the paper are respectively the upper direction and the lower direction, the left side and the right side of the paper are respectively the front direction and the rear direction, and the outer side and the inner side of the paper are respectively the left direction and the right direction.

[0036] In order to ensure that the operator can accurately rotate the syringe connector 30 to each operating position, a positioning mechanism needs to be set between the base 10 and the syringe connector 30; the syringe connector 30 rotated to the operating position is positioned by the positioning mechanism to produce a sense of click, so that the operator can quickly and accurately determine whether the syringe connector 30 is rotated into place, thereby improving the operator's experience.

[0037] It is understandable that the positioning mechanism has various structural forms, including but not limited to the following two structural forms.

[0038] Structural form 1:

[0039] like Figure 2 , Figure 4 , Figure 5 and Figure 10As shown, the positioning mechanism includes a first positioning member arranged on the wall of the internal installation cavity 11 and a second positioning member arranged on the outer wall of the syringe connector 30; one of the first positioning member and the second positioning member is a positioning protrusion 41, and the other is a positioning groove 42 that is engaged or disengaged with the positioning protrusion 41. When the positioning protrusion 41 is engaged with the positioning groove 42, a "clicking sound" is generated, and a sense of stuck in the engaged state can be provided, thereby providing the operator with dual feedback of sound and touch, and improving the operator's experience; in addition, since the positioning protrusion 41 requires a large force to disengage from the positioning groove 42, when the two are engaged, they can also provide auxiliary positioning for the syringe connector 30, thereby preventing the syringe connector 30 from accidentally rotating during the operation of the syringe.

[0040] Among them, the number of first positioning members is not less than the number of container connectors 20, the number of second positioning members is not less than 1, or the number of second positioning members is not less than the number of container connectors 20, and the number of first positioning members is not less than 1; the setting position of each first positioning member and the second positioning member can be determined according to the setting orientation of the container connector 20, as long as at least one set of positioning protrusions 41 and positioning grooves 42 are in a snap-fit state at each operating position.

[0041] Structural form 2:

[0042] like Figure 2 and Figure 5 As shown, the positioning mechanism includes a first friction surface 43 arranged on the base 10 and a second friction surface 44 arranged on the syringe connector 30; the number and orientation of the first friction surface 43 and the second friction surface 44 are determined according to the number and orientation of the container connector 20, as long as it is ensured that when the syringe connector 30 is rotated to any operating position, at least one second friction surface 44 can contact the first friction surface 43 to generate a friction force that limits the rotation of the syringe connector 30, and the friction force will cause the operator to feel a sense of jamming; in addition, when the second friction surface 44 contacts the first friction surface 43, the operator needs to apply a large force to disengage the second friction surface 44 from the first friction surface 43. Therefore, when the two cooperate, they can also provide auxiliary positioning for the syringe connector 30 to prevent the syringe connector 30 from accidentally rotating during the operation of the syringe.

[0043] It can be understood that the first friction surface 43 is a part of the rear end face of the base body 10 or is provided by a first positioning friction block arranged on the base body 10; the second friction surface 44 is provided by a second positioning friction block arranged on the syringe connector 30 or by a shoulder on the syringe connector 30. When the second friction surface 44 is misaligned with the first friction surface 43, the syringe connector 30 can rotate freely without jamming under the action of a small force. When the second friction surface 44 is aligned with the first friction surface 43, a jamming feeling will occur, resulting in the need for a larger force to rotate the syringe connector 30; the operator determines whether the syringe connector 30 has rotated in place by whether there is a jamming feeling when rotating the syringe connector 30.

[0044] The above two structural forms can be used alone or in combination, as long as it is ensured that the syringe connector 30 can be positioned and has a jamming feeling feedback when rotated to the operating position; in this embodiment, a scheme of using the two structural forms in combination is preferably adopted.

[0045] As Figure 4 、 Figure 7 and Figure 9 shown, the internal installation cavity 11 includes a cylindrical rotation installation cavity 11a and a positioning installation cavity 11b. The diameter of the rotation installation cavity 11a is smaller than that of the positioning installation cavity 11b, and through holes communicating with the respective first fluid channels 21 are provided on the cavity wall of the rotation installation cavity 11a; the second fluid channel 31 of the syringe connector 30 is an L-shaped channel, and the L-shaped channel includes an axial hole and a radial hole that communicate with each other, and the radial hole of the L-shaped channel can be respectively aligned with the through holes on the cavity wall of the rotation installation cavity 11a to realize the communication between the L-shaped channel and different first fluid channels 21.

[0046] As Figure 4 、 Figure 6 and Figure 9 shown, the syringe connector 30 includes a first rotating shaft 30a, a second rotating shaft 30b, and a syringe connection head 30c that are connected in sequence from front to back; both the first rotating shaft 30a and the second rotating shaft 30b are cylinders, and the syringe connection head 30c is used to connect the syringe; an annular groove 32 is formed on the outer wall of the first rotating shaft 30a, and an annular block 111 is formed on the cavity wall of the rotation installation cavity 11a; when the syringe connector 30 is inserted into the internal installation cavity 11, the annular groove 32 on the first rotating shaft 30a can cooperate with the annular block 111 on the cavity wall of the rotation installation cavity 11a, so that the syringe connector 30 is installed in the internal installation cavity 11 in a state where it can only rotate and cannot move axially. The radial hole of the L-shaped channel is opened on the outer wall of the first rotating shaft 30a, and the first rotating shaft 30a can be rotationally connected with the rotation installation cavity 11a in a sealed state to avoid fluid leakage in the non-operating state.

[0047] To facilitate the adjustment of the position of the syringe connector 30, a handle 60 is formed on the syringe connector 30, and an anti-slip member is provided on the handle 60. The anti-slip member is an anti-slip groove or an anti-slip pad.

[0048] As shown in Figure 4 , Figure 5 , Figure 9 and Figure 10 , the first positioning member is arranged on the inner wall of the positioning installation cavity 11b, and the second positioning member is arranged on the outer wall of the second rotating shaft 30b; one of the first positioning member and the second positioning member is a positioning protrusion, and the other is a positioning groove; the positioning protrusion 41 is a positioning rib extending along the axial direction of the positioning installation cavity 11b, and the positioning groove 42 is a strip-shaped groove matching with the positioning rib. The cross-section of the positioning rib is preferably fan-shaped; of course, the positioning protrusion 41 can also be a positioning column extending along the radial direction of the positioning installation cavity 11b, and the positioning groove 42 is a spherical groove matching with the positioning column.

[0049] In a preferred embodiment, as shown in Figure 8 and Figure 9 , there are two container connectors 20, and the two container connectors 20 are coaxially arranged; at this time, preferably two first positioning members are provided, and the two first positioning members are evenly distributed on the inner circumference of the positioning installation cavity 11b.

[0050] In a more specific embodiment, the second positioning member is preferably provided in two or four, and each second positioning member is evenly distributed on the outer circumference of the second rotating shaft 30b to ensure the force stability during the rotation of the syringe connector 30.

[0051] Since the container involved in the present application is mainly a vial, and a rubber stopper is provided at the bottle mouth to seal the substances in the vial. Therefore, the container connector 20 is selected as a puncture tube, and the puncture tube has a puncture end capable of piercing the rubber stopper.

[0052] As shown in Figure 1 , a drainage port 22 communicating with the first fluid passage 21 is formed on the outer wall of the puncture tube near the puncture end, so that when the container is inverted, the remaining liquid below the puncture end can flow out along the drainage port 22, avoiding the residual liquid in the container from affecting the concentration of the prepared solution.

[0053] To ensure the stability of the container on the container connector 20, as shown in Figure 1 , Figure 3 , Figure 4 , Figure 8 and Figure 9As shown, a clamping mechanism 50 coaxial with the container connecting member 20 is provided on the base body 10. The clamping mechanism 50 is used to clamp or release the container. Among them, the clamping mechanism 50 includes a plurality of clamping members 51a distributed circumferentially around the container connecting member 20, and each clamping member 51a encloses a clamping space for clamping the container; the clamping member 51a includes a cantilever portion 511 and a limiting portion 512 located at the free end of the cantilever portion 511; each limiting portion 512 cooperates to form an anti-disengagement mechanism for preventing the container from disengaging from the clamping space.

[0054] When it is necessary to install the container on the container connecting member 20, just align the container with the container connecting member 20 and insert it into the clamping space enclosed by each clamping member 51a. During the insertion process, the limiting portion 512 of the clamping member 51a can deflect away from the container to ensure the smooth insertion of the container; when the container is completely inserted into the clamping space, the limiting portion 512 will reset and press on the container to prevent the container from disengaging from the clamping mechanism.

[0055] Preferably, as Figure 9 shown, the limiting portion 512 includes a first guiding surface 5121 for stopping the container, and the first guiding surface 5121 is an inclined surface; when the container moves out of the clamping space along the axis direction of the container connecting member 20, it will squeeze the first guiding surface 5121 of the limiting portion 512, so that the limiting portion 512 rotates away from the container, thus smoothly moving the container out and reducing the difficulty of removing the container.

[0056] Furthermore, as Figure 9 shown, the limiting portion 512 is wedge-shaped and includes a second guiding surface 5122, and the second guiding surface 5122 is an inclined surface; when the container moves into the clamping space, it will squeeze the second guiding surface 5122, so that the limiting portion 512 rotates away from the container.

[0057] Furthermore, as Figure 1 and Figure 8 shown, the clamping mechanism 50 includes a plurality of guiding members 51b distributed circumferentially around the container connecting member 20, and the clamping members 51a and the guiding members 51b are alternately distributed on the same circumference; among them, the guiding member 51b includes a cantilever portion 511 and a guiding portion 513 located at the free end of the cantilever portion 511, and the guiding portion 513 includes a third guiding surface 5131; when the container moves into the clamping space, it will squeeze the third guiding surface 5131, so that the guiding portion 513 rotates away from the container.

[0058] Preferably, as Figure 8 shown, the clamping member 51a and / or the guiding member 51b includes a surrounding portion 514; the surrounding portion 514 is located at one end of the limiting portion 512 or the guiding portion 513 away from the cantilever portion 511. In this way, the inclination of the inserted container can be restricted by the surrounding portion to prevent the container from tilting excessively and disengaging from the clamping mechanism.

[0059] Furthermore, if Figure 7 and Figure 8 As shown, the clamping mechanism 50 includes a stop mechanism for preventing the container from tilting; the stop mechanism cooperates with the limiting portion 512 of the clamping member 51a to limit the axial position of the container; the stop mechanism is a stop plate in contact with the top surface of the container or the stop mechanism includes a plurality of stop members 52, each of which is in contact with the top surface of the container; in the present embodiment, the stop mechanism includes a plurality of stop members 52, and each of the stop members 52 is symmetrically distributed about the center of the container connector 20.

[0060] When it is necessary to transfer the fluids contained in multiple containers to the syringe, the syringe connector 30 in the fluid transfer device must first be rotated to a state where the fluid channels are not connected to each other; then each container is installed on the corresponding container connector 20, and the syringe is installed on the syringe connector 30; then, in accordance with the mixing order, the syringe connector 30 is rotated to the operating position where each container is connected, and the components to be mixed in the corresponding container are sucked into the syringe at the operating position. When the components to be mixed in all containers are sucked into the syringe, the solution preparation is completed; since there is a sense of jamming when the syringe connector 30 is rotated to each operating position, it is convenient for the operator to quickly and accurately determine whether the syringe connector 30 is rotated into place, which effectively improves the operator's experience.

[0061] In summary, the utility model effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A fluid transfer device, characterized in that, It includes a base body (10) and a plurality of container connectors (20) arranged on the base body (10); a first fluid passage (21) communicating with the corresponding container is provided in each container connector (20); a syringe connector (30) is rotatably installed in the base body (10), and a second fluid passage (31) communicating with the syringe is provided on the syringe connector (30); the syringe connector (30) can be rotated and switched between a plurality of operating positions so that the second fluid passage (31) communicates with different first fluid passages (21); a positioning mechanism is provided between the base body (10) and the syringe connector (30), and the positioning mechanism is used to position the syringe connector (30) rotated to the operating position; the positioning mechanism includes a first friction surface (43) provided on the base body (10) and a second friction surface (44) provided on the syringe connector (30); when the syringe connector (30) is rotated to the operating position, the second friction surface (44) contacts the first friction surface (43) to generate a frictional force that restricts the rotation of the syringe connector (30).

2. The fluid transfer device according to claim 1, characterized in that, The positioning mechanism further includes a first positioning member provided on the internal installation cavity (11) and a second positioning member provided on the outer wall of the syringe connector (30); one of the first positioning member and the second positioning member is a positioning protrusion (41), and the other is a positioning groove (42) that cooperates with the positioning protrusion (41) for clamping or disengaging.

3. A fluid transfer device according to any one of claims 1 to 2, characterized in that, A clamping mechanism (50) coaxial with the container connector (20) is provided on the base body (10); the clamping mechanism (50) is used to clamp or release the container.

4. A fluid transfer device according to claim 3, wherein, The clamping mechanism (50) includes a plurality of clamping members (51a) distributed in a circumferential manner centered on the container connector (20), and each clamping member (51a) encloses a clamping space for clamping the container; the clamping member (51a) includes a cantilever portion (511) and a limiting portion (512) located at the free end of the cantilever portion (511); each limiting portion (512) cooperates to form an anti-disengagement mechanism for preventing the container from disengaging from the clamping space.

5. A fluid transfer device according to claim 4, wherein, The limiting portion (512) includes a first guiding surface (5121) for stopping the container; when the container is moved out of the clamping space, the first guiding surface (5121) of the limiting portion (512) is squeezed, so that the limiting portion (512) rotates in a direction away from the container.

6. The fluid transfer device according to claim 5, wherein The limiting portion (512) includes a second guiding surface (5122), and when the container is moved into the clamping space, the second guiding surface (5122) is squeezed, so that the limiting portion (512) rotates in a direction away from the container.

7. A fluid transfer device according to claim 6, characterized in that, The clamping mechanism (50) includes a plurality of guiding members (51b) that are circumferentially distributed around the container connecting member (20), and the clamping members (51a) and the guiding members (51b) are alternately distributed on the same circumference; the guiding member (51b) includes a cantilever portion (511) and a guiding portion (513) located at the free end of the cantilever portion (511), and the guiding portion (513) includes a third guiding surface (5131); when the container is moved into the clamping space, the third guiding surface (5131) is squeezed, so that the guiding portion (513) rotates in a direction away from the container.

8. A fluid transfer device according to claim 4, characterized in that, The clamping mechanism (50) includes a stopper mechanism for preventing the container from tilting; the stopper mechanism cooperates with the limiting portion (512) of the clamping member (51a) to limit the axial position of the container.

9. A fluid transfer device according to claim 8, characterized in that, The container connecting member (20) is a puncture tube, and a drainage port (22) communicating with the first fluid passage (21) is formed on the outer wall of the puncture tube near the puncture end.

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