Liquid delivery device

Abstract

A liquid conveying device comprises a base, a reversing knob and a fixing piece, and the base is provided with an injection port, a connecting port and an output port; a body of the reversing knob is rotatably accommodated in the base, a groove is formed in the outer peripheral wall of the body, and the groove is matched with the inner peripheral wall of the base to form a flowing channel; the flow channel communicates the injection port with the connection port in response to the body rotating to the first position, and communicates the injection port with the output port in response to the body rotating to the second position; the fixing piece comprises an indicating cover plate and a connecting part, the connecting part penetrates through the reversing knob and is fixedly connected with the base, the indicating cover plate is attached to the surface of the reversing knob, a rotating mark is arranged on the surface of the reversing knob, and an indicating mark is arranged on the indicating cover plate; the body responding to the reversing knob rotates relative to the base, the rotating mark and the indicating mark are matched with each other to indicate that the body is located at the first position or the second position, and the operation efficiency and accuracy of medical staff are improved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a liquid delivery device. Background Art

[0002] In medical treatment, drugs for delivery into the human body include solutions and dry powders. Solution-based drugs are generally contained in a containing device, and an injection device can be used to directly extract and then deliver them into the human body. For dry powder drugs, they need to be dissolved with physiological solution before use to ensure that the drugs are in an appropriate concentration and state before administration.

[0003] During the delivery of solution-based drugs, an operator generally inserts an injection device into the containing device to extract the drug in the containing device. After separating the injection device from the containing device, the injection device is then connected to a delivery device to deliver the drug into the human body. During the delivery of dry powder drugs, a liquid such as physiological solution is generally pre-filled into the injection device. The injection device is used to inject the physiological solution into a containing device containing solids such as dry powder. After the solids are dissolved to form a mixed liquid, the mixed liquid is then extracted. Finally, the injection device is connected to a delivery device to deliver the drug into the human body. Summary of the Invention

[0004] The present disclosure aims to provide a liquid delivery device.

[0005] The present disclosure is achieved through the following technical solutions:

[0006] A liquid delivery device includes a base, a reversing knob, and a fixing member. The base is provided with an injection port, a connection port, and an output port;

[0007] The body of the reversing knob is rotatably received in the base. A groove is provided on the outer peripheral wall of the body, and the groove and the inner peripheral wall of the base cooperate to form a flow channel. The body has a first position and a second position. In response to the body rotating to the first position, the flow channel connects the injection port and the connection port. In response to the body rotating to the second position, the flow channel connects the injection port and the output port;

[0008] The fixing member includes an indicating cover plate and a connecting portion connected to each other. The connecting portion passes through the reversing knob and is fixedly connected to the base. The indicating cover plate is attached to the surface of the reversing knob. A rotation mark is provided on the surface of the reversing knob, and an indicating mark is provided on the indicating cover plate;

[0009] In response to the body of the reversing knob rotating relative to the base, the rotation mark and the indicating mark cooperate with each other to indicate that the body is in the first position or the second position.

[0010] For example, the material of the indicating cover plate is a transparent material, the indicating direction of the rotating mark is the first direction, and the indicating direction of the indicating mark is the second direction;

[0011] In response to the rotation of the body of the reversing knob relative to the base, when the included angle between the first direction and the second direction is a first preset angle, it indicates that the body is in the first position, and when the included angle between the first direction and the second direction is a second preset angle, it indicates that the body is in the second position.

[0012] For example, along the circumferential direction of the base, the injection port and the output port are oppositely arranged, the connection port is arranged at a position between the injection port and the output port, the second direction is arranged towards the injection port, the first preset angle is 90 degrees, and the second preset angle is 180 degrees.

[0013] For example, the indicating mark includes a first hollow portion and a second hollow portion formed on the indicating cover plate, and the first hollow portion and the second hollow portion are circumferentially spaced apart on the indicating cover plate;

[0014] In response to the rotation of the body of the reversing knob relative to the base, when the rotating mark is located at the position of the first hollow portion, it indicates that the body is in the first position, and when the rotating mark is located at the position of the second hollow portion, it indicates that the body is in the second position.

[0015] For example, the first hollow portion is arranged corresponding to the connection port on the indicating cover plate, and the second hollow portion is arranged corresponding to the output port on the indicating cover plate.

[0016] For example, the injection port, the connection port, and the output port are all arranged on the side wall of the base, and the injection port, the connection port, and the output port are arranged in a staggered manner along the axial direction of the base;

[0017] The flow channel includes a main passage section and an auxiliary passage section. The main passage section extends along the circumferential direction of the body, and the main passage section is arranged corresponding to the injection port along the axial direction of the base. The main passage section is in communication with the injection port, or in response to the rotation of the body, the main passage section is in communication with the injection port;

[0018] The auxiliary passage section at least extends along the axial direction of the body and communicates with the main passage section. In response to the body rotating to the first position, the auxiliary passage section communicates with the connection port, and in response to the body rotating to the second position, the auxiliary passage section communicates with the output port.

[0019] For example, the auxiliary through section and the main through section are arranged perpendicular to each other.

[0020] For example, the reversing knob further includes a screwing part connected to the body, and the screwing part is located outside the base; in response to the rotation of the screwing part, the screwing part drives the body to rotate in the base to the first position or the second position;

[0021] The connecting part sequentially passes through the screwing part and the body and is fixedly connected to the base, the indicating cover plate fits on the surface of the screwing part, and the rotation mark is arranged on the surface of the screwing part.

[0022] For example, the radial dimension of the screwing part is greater than the radial dimension of the body, the end of the base includes an opening structure, the body is accommodated in the base through the opening structure, and the screwing part abuts against the end of the base.

[0023] For example, a limiting member is arranged on the outer wall surface of the base, the limiting member includes a first limiting part and a second limiting part, and a convex part is arranged on the screwing part;

[0024] In response to the screwing part rotating in the first direction, the convex part is limited by the first limiting part to limit the screwing part from continuing to rotate in the first direction; in response to the screwing part rotating in the second direction, the convex part is limited by the second limiting part to limit the screwing part from continuing to rotate in the second direction.

[0025] For example, the limiting member is an annular protrusion extending circumferentially on the outer wall surface of the base, and the two ends of the annular protrusion are the first limiting part and the second limiting part respectively.

[0026] For example, the screwing part includes a screwing body and a fixed wall, the screwing body abuts against the end of the base, and the fixed wall is connected to the screwing body;

[0027] Along the axial direction of the body, a receiving space is formed between the part of the body corresponding to the fixed wall and the fixed wall, and the end of the base is accommodated in the receiving space.

[0028] For example, both the body and the screwing part are cylindrical structures, and the central axes of the body and the screwing part coincide with each other.

[0029] For example, the injection port is used to connect an injection device, the connection port is used to connect a containing device, and the output port is used to connect a conveying device. Description of the Drawings

[0030] Figure 1Schematic diagram (I) of the assembly of the liquid delivery device with the injection device, the accommodation device, and the delivery device according to an embodiment of the present disclosure;

[0031] Figure 2 Schematic diagram (II) of the assembly of the liquid delivery device with the injection device, the accommodation device, and the delivery device according to an embodiment of the present disclosure;

[0032] Figure 3 Schematic diagram (III) of the assembly of the liquid delivery device with the injection device, the accommodation device, and the delivery device according to an embodiment of the present disclosure;

[0033] Figure 4 Schematic diagram of the structure of the base according to an embodiment of the present disclosure;

[0034] Figure 5 Schematic cross-sectional structure diagram of the base according to an embodiment of the present disclosure;

[0035] Figure 6 Schematic diagram (I) of the assembly of the liquid delivery device according to an embodiment of the present disclosure;

[0036] Figure 7 Schematic diagram (II) of the assembly of the liquid delivery device according to an embodiment of the present disclosure;

[0037] Figure 8 Schematic cross-sectional structure diagram of the liquid delivery device according to an embodiment of the present disclosure;

[0038] Figure 9 Schematic diagram of the assembly of the reversing knob and the fixing member according to an embodiment of the present disclosure;

[0039] Figure 10 is Figure 9 Schematic cross-sectional structure diagram of the reversing knob and the fixing member shown;

[0040] Figure 11 Schematic diagram (I) of the structure of the reversing knob according to an embodiment of the present disclosure;

[0041] Figure 12 Schematic diagram (II) of the structure of the reversing knob according to an embodiment of the present disclosure;

[0042] Figure 13 Schematic diagram (III) of the structure of the reversing knob according to an embodiment of the present disclosure;

[0043] Figure 14 Schematic diagram of the structure of the fixing member according to an embodiment of the present disclosure;

[0044] Figure 15 Schematic diagram of the structure of the base on one side of the first limiting portion according to an embodiment of the present disclosure;

[0045] Figure 16Schematic diagram of one side of the base of an embodiment of the present disclosure at the second limiting portion.

[0046] Reference numerals in the above drawings:

[0047] 10 - Liquid delivery device, 20 - Injection device, 30 - Accommodating device, 40 - Delivery device;

[0048] 100 - Base, 110 - Injection port, 111 - First connector, 120 - Connection port, 121 - Second connector, 130 - Output port, 131 - Third connector, 140 - Annular protrusion, 141 - First limiting portion, 142 - Second limiting portion;

[0049] 200 - Reversing knob, 210 - Groove, 211 - First section, 212 - Second section, 220 - Body, 230 - Screwing portion, 231 - Screwing body, 232 - Fixed wall, 233 - Protrusion portion, 234 - Accommodating space, 250 - Rotation mark;

[0050] 300 - Fixing member, 310 - Indicator cover plate, 311 - Indicator mark, 320 - Connection portion. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present disclosure clearer and more understandable, the present disclosure will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0052] In the present disclosure, unless otherwise clearly defined and limited, terms such as "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, a movable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components such as abutment. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances. It should be noted that when there are limiting words before "connected" and "connected", they have the meanings limited by the corresponding limiting words, only excluding the obvious cases that need to be excluded, and not excluding other possible cases. For example, "detachable connection" refers to a detachable connection, excluding integration, but movable connection and the like are not excluded.

[0053] In medical treatment, drug delivery is usually involved, especially delivering drugs into the human body. Such drugs include solutions and dry powders, and are generally stored in a containing device 30 when not in use. For solution-type drugs, medical staff generally use an injection device 20 to insert into the containing device 30, extract the drug in the containing device 30, separate the injection device 20 from the containing device 30, and then connect the injection device 20 to a delivery device 40 to deliver the drug into the human body; for dry powder drugs, medical staff generally pre-fill a physiological solution or other liquid into the injection device 20, use the injection device 20 to inject the physiological solution or other liquid into the containing device 30 containing the dry powder drug, dissolve the dry powder drug to form a mixed liquid, then extract the mixed liquid, and finally connect the injection device 20 to the delivery device 40 to deliver the mixed liquid into the human body. This drug delivery method has relatively cumbersome overall operations, and the injection device 20 needs to be pulled out and inserted relatively many times. During the process of repeatedly pulling out and inserting the injection device 20 by medical staff, the part of the injection device 20 that comes into contact with the drug will be exposed to the air, which may cause contamination of the device and the drug, failing to meet the requirements of aseptic operation. At the same time, the repeated pulling out and inserting of the injection device 20 may also pose a danger to medical staff.

[0054] For example, for patients who need long-term infusion of liquid medicine, a catheter is generally pre-embedded in the patient's body as the delivery device 40 to avoid multiple needle insertions into the human body. In this case, when it is necessary to deliver liquid medicine to the human body, an injection device 20 such as a syringe needs to be used to first insert into a containing device 30 such as a medicine bottle, extract the liquid medicine in the medicine bottle or dissolve the drug in the medicine bottle and then extract it, and then insert the syringe into the catheter to inject the liquid medicine into the human body through the catheter.

[0055] To avoid the repeated pulling out and inserting of the injection device 20 during liquid delivery, meet the aseptic requirements during liquid delivery, improve the safety performance of liquid delivery, and at the same time avoid the possible danger that the injection device 20 may pose to medical staff, some embodiments of the present disclosure provide a liquid delivery device 10, which can be connected to the injection device 20, the containing device 30, and the delivery device 40 at the same time, and communicate different devices according to the usage requirements, thereby improving the asepticity and safety during liquid delivery.

[0056] Please refer to Figure 1 、 Figure 2 and Figure 3 , the liquid delivery device 10 includes a base 100, a reversing knob 200, and a fixing member 300.

[0057] Refer to Figure 4 and Figure 5 , the base 100 is provided with an injection port 110, a connection port 120, and an output port 130.

[0058] refer to Figures 9 to 13 The body 220 of the reversing knob 200 is rotatably accommodated in the base 100, and the outer wall of the body 220 is provided with a groove 210, and the groove 210 cooperates with the inner wall of the base 100 to form a flow channel. The body 220 has a first position and a second position. In response to the body 220 rotating to the first position, the flow channel connects the injection port 110 with the connection port 120, and in response to the body 220 rotating to the second position, the flow channel connects the injection port 110 with the output port 130.

[0059] refer to Figures 6 to 8 , Figure 14 The fixing member 300 includes an indicating cover plate 310 and a connecting portion 320 connected to each other. The connecting portion 320 is disposed through the reversing knob 200 and is fixedly connected to the base 100. The indicating cover plate 310 is attached to the surface of the reversing knob 200. Figure 12 and Figure 13 The surface of the reversing knob 200 is provided with a rotation mark 250, referring to Figure 6 , Figure 7 and Figure 9 The indicating cover plate 310 is provided with an indicating mark 311. In response to the body 220 of the reversing knob 200 rotating relative to the base 100, the rotation mark 250 and the indicating mark 311 cooperate with each other to indicate that the body 220 is in the first position or in the second position.

[0060] By providing a groove 210 on the outer wall of the body 220 in the reversing knob 200, when the body 220 is rotatably accommodated in the base 100, it is convenient for the groove 210 to cooperate with the inner wall of the base 100 to form a flow channel, and at the same time, a penetration space is reserved for the interior of the reversing knob 200 for the fixing member 300 to penetrate; when the connecting portion 320 of the fixing member 300 is penetrated through the reversing knob 200 and fixedly connected to the base 100, the indicating cover 310 is attached to the surface of the reversing knob 200, which can limit the axial movement of the reversing knob 200 relative to the base 100, so that the body 220 of the reversing knob 200 can only rotate inside the base 100, thereby preventing the reversing knob 200 from being separated from the base 100, ensuring the stability and reliability of the entire liquid delivery device 10 during use, and further improving the sterility and safety of the liquid delivery process.

[0061] For example, the injection port 110 is used to connect to the injection device 20 , the connection port 120 is used to connect to the receiving device 30 , and the output port 130 is used to connect to the delivery device 40 .

[0062] When the body 220 of the reversing knob 200 is rotated within the base 100 to the first position under the action of an external force, the flow channel connects the injection port 110 and the connection port 120, that is, connects the injection device 20 and the accommodating device 30. The injection device 20 can then extract the liquid medicine in the accommodating device 30 or extract it after dissolving the medicine in the accommodating device 30. When the body 220 of the reversing knob 200 is rotated within the base 100 to the second position under the action of an external force, the flow channel connects the injection port 110 and the output port 130, that is, connects the injection device 20 and the delivery device 40. The injection device 20 can then inject the extracted liquid medicine into the human body through the delivery device 40.

[0063] During the operation by medical staff, according to the mutual cooperation between the rotation mark 250 and the indication mark 311, it can be clearly determined whether the body 220 is in the first position or the second position, so as to know the connection situation of the ports on the body 220, avoiding the situation of incorrect port connection during the operation, and improving the operation efficiency and accuracy of medical staff. During the entire liquid delivery process, the injection device 20 does not need to be repeatedly inserted and withdrawn. Medical staff only need to operate the body 220 of the reversing knob 200 to achieve liquid delivery, greatly improving the sterility and safety during the liquid delivery process.

[0064] For example, the structure of the fixing member 300 is referred to Figure 14 As shown, the connecting portion 320 of the fixing member 300 is a rod-shaped structure, and one end of the connecting portion 320 is connected to the indication cover plate 310. Refer to Figure 8 、 Figure 9 and Figure 10 . The other end of the connecting portion 320 passes through the reversing knob 200 and is fixedly connected to the base 100. The radial dimension of the indication cover plate 310 is larger than that of the connecting portion 320. The indication cover plate 310 is attached to the surface of the reversing knob 200 to achieve axial limitation of the reversing knob 200. The indication cover plate 310 of the fixing member 300 being attached to the reversing knob 200 means that the indication cover plate 310 of the fixing member 300 is in contact with the reversing knob 200 to perform axial limitation on the reversing knob 200, but does not affect the rotation of the body 220 of the reversing knob 200 relative to the base 100. For example, the obvious situation that can be excluded is that the indication cover plate 310 of the fixing member 300 tightly abuts against the reversing knob 200, resulting in the body 220 of the reversing knob 200 being unable to rotate relative to the base 100.

[0065] The injection device 20, the accommodation device 30, and the delivery device 40 can all be devices produced by any brand and any manufacturer and applicable to the liquid delivery device 10 in the present disclosure. The injection device 20 is configured to perform injection and extraction of liquid after being connected to the base 100 of the liquid delivery device 10. When it is necessary to inject liquid into the accommodation device 30, the injection device 20 also needs to have the function of storing liquid; the accommodation device 30 is configured to store and mix drugs after being connected to the base 100 of the liquid delivery device 10; the delivery device 40 is configured to deliver liquid drugs after being connected to the base 100 of the liquid delivery device 10. For example, referring to Figures 1 to 3 , when the injection device 20 is a syringe, the accommodation device 30 is a medicine bottle, and the delivery device 40 is a catheter, the base 100 of the liquid delivery device 10 is provided with an injection port 110 for connecting the syringe, a connection port 120 for connecting the medicine bottle, and an output port 130 for connecting the catheter.

[0066] The substance contained in the medicine bottle can be liquid medicine or solid medicine, and the substance contained in the syringe can be liquid or can contain nothing. When the substances contained in both the medicine bottle and the syringe are liquid, at the beginning of the operation, the body 220 of the reversing knob 200 can be rotated relative to the base 100 to the first position to connect the injection port 110 and the connection port 120. Use the syringe to inject the liquid inside it into the medicine bottle to achieve the mixing of the two liquids, forming a mixed liquid. Then use the syringe to draw out the mixed liquid. At this time, rotate the body 220 of the reversing knob 200 relative to the base 100 to the second position to connect the injection port 110 and the output port 130. Then use the syringe to inject the mixed liquid into the human body through the catheter, and finally achieve the injection of the medicine into the human body. If the substance contained in the medicine bottle is liquid and the syringe contains nothing, at the beginning of the operation, also first rotate the body 220 of the reversing knob 200 relative to the base 100 to the first position to connect the injection port 110 and the connection port 120. Use the syringe to draw out the liquid inside the medicine bottle, and then rotate the body 220 of the reversing knob 200 relative to the base 100 to the second position to connect the injection port 110 and the output port 130. Then use the syringe to inject the liquid into the human body through the catheter to achieve the injection of the medicine into the human body. Similarly, if the substance contained in the medicine bottle is solid and the substance contained in the syringe is liquid, at the beginning of the operation, rotate the body 220 of the reversing knob 200 relative to the base 100 to the first position to connect the injection port 110 and the connection port 120. Use the syringe to inject the liquid inside it into the medicine bottle to achieve the mixing of the liquid and the solid, forming a mixed liquid. Then use the syringe to draw out the mixed liquid. At this time, rotate the body 220 of the reversing knob 200 relative to the base 100 to the second position to connect the injection port 110 and the output port 130. Then use the syringe to inject the mixed liquid into the human body through the catheter to achieve the injection of the medicine into the human body.

[0067] To make the connection between the injection port 110 of the base 100 and the syringe, the connection between the connection port 120 and the medicine bottle, and the connection between the output port 130 and the catheter more convenient, corresponding connectors can also be provided on the base 100. For example, refer to Figures 4 to 8, on the outer peripheral wall of the base 100, a first connector 111, a second connector 121, and a third connector 131 are provided. Among them, the proximal end of the first connector 111 is connected to the injection port 110 of the base 100, the distal end of the first connector 111 is connected to a syringe, the proximal end of the second connector 121 is connected to the connection port 120 of the base 100, the distal end of the second connector 121 is connected to a medicine bottle, and the proximal end of the third connector 131 is connected to the output port 130 of the base 100, and the distal end of the third connector 131 is connected to a catheter. It should be noted that in some other embodiments, if the injection device 20, the accommodating device 30, and the delivery device 40 adopt devices with other structures, the first connector 111, the second connector 121, and the third connector 131 may not be provided on the outer peripheral wall of the base 100, or may be selectively provided according to actual needs.

[0068] In some embodiments of the present disclosure, the material of the indicating cover plate 310 is a transparent material. Refer to Figure 12 and Figure 13 , the indicating direction of the rotation mark 250 is the first direction. Refer to Figure 6 , Figure 7 and Figure 9 , the indicating direction of the indicating mark 311 is the second direction. In response to the rotation of the body 220 of the reversing knob 200 relative to the base 100, when the included angle between the first direction and the second direction is a first preset angle, it indicates that the body 220 is in the first position, and when the included angle between the first direction and the second direction is a second preset angle, it indicates that the body 220 is in the second position. When the body 220 of the reversing knob 200 rotates within the base 100, the fixing member 300 remains fixed relative to the base 100, and the rotation mark 250 will rotate relative to the indicating mark 311, and the included angle between the first direction and the second direction will change. By observing the included angle between the first direction and the second direction, when the included angle presents the first preset angle, the medical staff can know that the body 220 of the reversing knob 200 is in the first position, and when the included angle presents the second preset angle, the medical staff can know that the body 220 of the reversing knob 200 is in the second position, which is more intuitive and further improves the operation accuracy of the medical staff.

[0069] For example, it is indicated that the material of the indicator cover plate 310 is made of transparent plastic. Both the rotation mark 250 and the indicator mark 311 are arrows with directions, and the pointing direction of the arrow is the indication direction. The indication direction of the rotation mark 250 is the first direction, and the indication direction of the indicator mark 311 is the second direction. When the body 220 of the reversing knob 200 rotates within the base 100, since the connecting portion 320 of the fixing member 300 is fixedly connected to the base 100, the fixing member 300 will not rotate following the reversing knob 200. Therefore, in response to the rotation of the body 220 of the reversing knob 200 relative to the base 100, when the included angle between the first direction and the second direction is a first preset angle, the indicating body 220 is in the first position, and the injection port 110 and the connection port 120 on the base 100 are in communication with each other, thereby enabling the injection device 20 and the accommodating device 30 to be in communication with each other; when the included angle between the first direction and the second direction is a second preset angle, the indicating body 220 is in the second position, and the injection port 110 and the output port 130 on the base 100 are in communication with each other, thereby enabling the injection device 20 and the conveying device 40 to be in communication with each other.

[0070] For example, with reference to Figure 3 、 Figure 4 and Figure 5 , along the circumferential direction of the base 100, the injection port 110 and the output port 130 are oppositely arranged, the connection port 120 is arranged at a position between the injection port 110 and the output port 130, the second direction is arranged towards the injection port 110, the first preset angle is 90 degrees, and the second preset angle is 180 degrees.

[0071] By fixing the indication direction of the indicator mark 311, that is, the second direction is a fixed direction, and at the same time the indicator cover plate 310 made of a transparent material does not block the first direction indicated by the rotation mark 250, and by adaptively adjusting the first preset angle and the second preset angle according to the positions of the ports, when the body 220 of the reversing knob 200 rotates within the base 100, medical staff can directly observe whether the indication direction of the rotation mark 250 turns to the connection port 120 or the output port 130, and thereby judge whether the body 220 is in the first position or the second position, which is more intuitive and concise.

[0072] For example, on the outer surface of the base 100, three connectors are arranged circumferentially in sequence. The injection port 110 and the output port 130 are arranged oppositely, and the connection port 120 is located in the middle of the injection port 110 and the output port 130 in the circumferential direction of the base 100, such that the connection lines between the three ports form an isosceles triangle. Due to the above-mentioned position settings of the ports, by setting the second direction indicated by the indication mark 311 towards the injection port 110, and then setting the first preset angle to 90 degrees, that is, when the indication direction of the rotation mark 250 is perpendicular to the indication direction of the indication mark 311, the first direction indicated by the rotation mark 250 can face the connection port 120. At this time, the body 220 of the commutation knob 200 is in the first position, and the injection port 110 and the connection port 120 are in communication, and thus the injection device 20 and the accommodating device 30 are in a communicating state; while setting the second preset angle to 180 degrees, that is, the indication direction of the rotation mark 250 and the indication direction of the indication mark 311 are on the same straight line. At this time, the first direction indicated by the rotation mark 250 can face the output port 130. At this time, the body 220 of the commutation knob 200 is in the second position, and the injection port 110 and the output port 130 are in communication, and thus the injection device 20 and the conveying device 40 are in a communicating state. It should be noted that when the position settings of the ports on the base 100 change, the first preset angle or the second preset angle can also be adjusted according to the actual situation, as long as it can indicate to the medical staff whether the body 220 of the commutation knob 200 is in the first position or the second position while the commutation knob 200 rotates.

[0073] In some other embodiments of the present disclosure, the indication mark 311 includes a first hollow portion and a second hollow portion formed on the indication cover plate 310, and the first hollow portion and the second hollow portion are circumferentially spaced apart on the indication cover plate 310. In response to the rotation of the body 220 of the commutation knob 200 relative to the base 100, when the rotation mark 250 is located at the position of the first hollow portion, it indicates that the body 220 is in the first position, and when the rotation mark 250 is located at the position of the second hollow portion, it indicates that the body 220 is in the second position.

[0074] When the body 220 of the reversing knob 200 rotates within the base 100, the fixing member 300 remains fixed relative to the base 100. When the rotation mark 250 on the reversing knob 200 rotates, it can rotate to appear at the position of the first hollow portion or the second hollow portion. During the operation, medical staff can judge whether the body 220 of the reversing knob 200 is at the first position and the second position by observing whether the rotation mark 250 is located at the positions of the first hollow portion and the second hollow portion, which is more intuitive and obvious, and further improves the operation accuracy of medical staff. Moreover, this setting enables the indication cover plate 310 to still use the mutual cooperation of the rotation mark 250 and the indication mark 311 to indicate that the body 220 is in the first position or the second position even when the indication cover plate 310 is not made of a transparent material.

[0075] For example, the indication cover plate 310 is designed as a circular plate-like structure, and the first hollow portion and the second hollow portion are provided at the edge position of the indication cover plate 310, and the first hollow portion and the second hollow portion are circumferentially spaced apart on the indication cover plate 310. For another example, the rotation mark 250 on the reversing knob 200 is an arrow with a direction, and the shape formed by enclosing the edges of the first hollow portion and the second hollow portion is also an arrow and matches the shape of the rotation mark 250, that is, when the reversing knob 200 rotates, the rotation mark 250 can completely appear within the first hollow portion or the second hollow portion. Therefore, when the reversing knob 200 rotates, it drives the rotation mark 250 to rotate accordingly. When the rotation mark 250 appears at the position of the first hollow portion and coincides with the first hollow portion, it indicates that the body 220 of the reversing knob 200 rotates to the first position, and at this time, the injection port 110 and the connection port 120 on the base 100 are in communication with each other; when the rotation mark 250 appears at the position of the second hollow portion and coincides with the second hollow portion, it indicates that the body 220 of the reversing knob 200 rotates to the second position, and at this time, the injection port 110 and the output port 130 on the base 100 are in communication with each other.

[0076] In some other embodiments of the present disclosure, the first hollow portion is provided on the indication cover plate 310 corresponding to the connection port 120, and the second hollow portion is provided on the indication cover plate 310 corresponding to the output port 130. By setting the hollow portion corresponding to the port on the base 100, when the rotation mark 250 on the reversing knob 200 appears at the position of a certain hollow portion, it indicates that the rotation mark 250 on the reversing knob 200 is located at the port position corresponding to this hollow portion, and at this time, the injection port 110 is in communication with this port. Similarly, it is more intuitive for medical staff and further improves the operation accuracy.

[0077] For example, in combination with the positions of the three ports on the base 100, the first hollow portion is correspondingly arranged on the indicating cover plate 310 at the connection port 120. When the reversing knob 200 rotates relative to the base 100, when the rotation mark 250 on the reversing knob 200 appears at the position of the first hollow portion, it indicates that the rotation mark 250 of the reversing knob 200 rotates to the position of the connection port 120. At this time, the body 220 of the reversing knob 200 is located at the first position, and the injection port 110 and the connection port 120 on the base 100 are in communication with each other, and the injection device 20 and the accommodating device 30 are connected; for another example, in combination with the positions of the three ports on the base 100, the second hollow portion is correspondingly arranged on the indicating cover plate 310 at the connection port 120. When the reversing knob 200 rotates relative to the base 100, when the rotation mark 250 on the reversing knob 200 appears at the position of the second hollow portion, it indicates that the rotation mark 250 of the reversing knob 200 rotates to the position of the output port 130. At this time, the body 220 of the reversing knob 200 is located at the second position, and the injection port 110 and the output port 130 on the base 100 are in communication with each other, and the injection device 20 and the conveying device 40 are connected.

[0078] Reference Figure 4 、 Figure 5 and Figure 6 , the injection port 110, the connection port 120 and the output port 130 are all arranged on the side wall of the base 100, and the injection port 110, the connection port 120 and the output port 130 are arranged in a staggered manner along the axial direction of the base 100. Taking Figure 5 as a reference, the axial direction of the base 100 is the up and down direction. The flow channel includes a main passage section and an auxiliary passage section. The main passage section extends along the circumferential direction of the body 220, and the main passage section is correspondingly arranged along the axial direction of the base 100 with the injection port 110, and the main passage section is in communication with the injection port 110, or in response to the rotation of the body 220, the main passage section is in communication with the injection port 110; the auxiliary passage section at least extends along the axial direction of the body 220 and communicates with the main passage section. In response to the body 220 rotating to the first position, the auxiliary passage section communicates with the connection port 120, and in response to the body 220 rotating to the second position, the auxiliary passage section communicates with the output port 130.

[0079] It should be noted that the main passage section of the flow passage extends along the circumferential direction of the main body 220. When the main passage section is circumferentially arranged around the main body 220 and the main body 220 of the reversing knob 200 is placed in the base 100, the main passage section is arranged corresponding to the injection port 110 along the axial direction of the base 100. At this time, regardless of whether the main body 220 of the reversing knob 200 rotates or not, the main passage section is always in communication with the injection port 110. When the main passage section only extends a certain distance circumferentially on the main body 220 and the main body 220 of the reversing knob 200 is placed in the base 100, although the main passage section is arranged opposite to the injection port 110 along the axial direction of the base 100, the main passage section and the injection port 110 are not necessarily in communication. If they are in a non-communicating state, then in response to the rotation of the main body, the main passage section and the injection port 110 can be in communication with each other. In addition, the auxiliary passage section extends at least along the axial direction of the main body 220, including: the auxiliary passage section only extends along the axial direction of the main body 220, and the auxiliary passage section extends along both the axial direction and the circumferential direction of the main body 220 at the same time.

[0080] By communicating the main passage section of the flow passage with the injection port 110, during the rotation of the main body 220 in the base 100, the auxiliary passage section of the flow passage can be selectively communicated with the connection port 120 or the output port 130, which is more simple and convenient in operation and can reduce the operation errors of medical staff.

[0081] In some embodiments of the present disclosure, referring to Figure 9 , Figures 11 to 13 , a groove 210 is provided on the outer peripheral wall of the main body 220. The groove 210 includes a first section 211 and a second section 212. The first section 211 extends along the circumferential direction of the main body 220, and the second section 212 extends along the axial direction of the main body 220. The second section 212 communicates with the first section 211. When the main body 220 is placed in the base 100, the groove 210 provided on the outer peripheral wall of the main body 220 cooperates with the inner peripheral wall of the base 100 to form a flow passage. That is, the main passage section of the flow passage is formed by the cooperation of the first section 211 of the groove 210 and the inner peripheral wall of the base 100. At this time, the main passage section of the flow passage is arranged corresponding to the injection port 110 along the axial direction of the base 100. The auxiliary passage section of the flow passage is formed by the cooperation of the second section 212 of the groove 210 and the inner peripheral wall of the base 100. At this time, the auxiliary passage section of the flow passage extends along the axial direction of the main body 220 and communicates with the main passage section.

[0082] During the rotation of the main body 220 of the reversing knob 200 within the base 100, the groove 210 always cooperates with the inner peripheral wall of the base 100 to form a flow channel, so that the shape of the entire flow channel does not change. At the same time, in the axial direction of the base 100, the injection port 110, the connection port 120, and the output port 130 are arranged in a staggered manner. During the rotation of the main body 220, the main passage section of the flow channel is communicated with the injection port 110. When the main body 220 rotates to the first position, the auxiliary passage section of the flow channel is communicated with the connection port 120. At this time, the injection port 110 and the connection port 120 can be communicated through the flow channel, and the injection device 20 and the accommodating device 30 can be connected. When the main body 220 rotates to the second position, the auxiliary passage section of the flow channel is communicated with the output port 130. At this time, the injection port 110 and the output port 130 can be communicated through the flow channel, and the injection device 20 and the conveying device 40 can be connected.

[0083] In some embodiments of the present disclosure, the auxiliary passage section and the main passage section are perpendicularly arranged. Through this connection method, the speed of the liquid can be reduced by using the position where the main passage section and the auxiliary passage section are interconnected. For example, when the liquid flows from the main passage section of the flow channel to the auxiliary passage section of the flow channel, the liquid will generate an impact at the connection position of the two sections to form a turbulent flow, thereby reducing the flow rate of the liquid and preventing medical staff from applying too much force to the injection device 20, resulting in too fast a flow rate of the liquid into the human body and causing damage to the human body.

[0084] For example, referring to Figure 11 and Figure 13 , the first section 211 of the groove 210 extends circumferentially on the outer peripheral wall of the main body 220. The second section 212 of the groove 210 is connected to the end position of the first section 211, and the second section 212 is perpendicularly arranged with respect to the first section 211. After the main body 220 is accommodated inside the base 100, the first section 211 of the groove 210 cooperates with the inner peripheral wall of the base 100 to form the main passage section of the flow channel, and the second section 212 of the groove 210 cooperates with the inner peripheral wall of the base 100 to form the auxiliary passage section of the flow channel. During the rotation of the main body 220, the shape of the entire flow channel does not change. The formed flow channel has an auxiliary passage section that can be communicated with the end position of the main passage section, and the auxiliary passage section is perpendicular to the main passage section.

[0085] In still other embodiments of the present disclosure, the auxiliary passage section of the flow passage communicates with the middle part of the main passage section, and the auxiliary passage section and the main passage section are arranged perpendicular to each other. In this way, the position where the main passage section and the auxiliary passage section communicate with each other can also be used to reduce the speed of the liquid. When the liquid flows from the main passage section of the flow passage to the auxiliary passage section of the flow passage, the liquid will first buffer in the main passage section. When the liquid reaches a certain stable state, it will enter the auxiliary passage section through the communication position between the two sections, so as to achieve the effect of reducing the liquid flow rate and prevent medical staff from applying too much force to the injection device 20, resulting in too fast a flow rate of the liquid entering the human body and causing damage to the human body. For example, the main passage section of the flow passage extends along the circumferential direction of the body 220, and the auxiliary passage section of the flow passage extends along the axial direction of the body 220, so that the overall shape of the flow passage is similar to a "T" shape. When the body 220 rotates in the base 100, the main passage section of the flow passage is always in communication with the injection port 110, and the auxiliary passage section of the flow passage selectively communicates with the connection port 120 or the output port 130.

[0086] In some embodiments of the present disclosure, referring to Figures 11 to 13 , the reversing knob 200 further includes a screwing portion 230 connected to the body 220, and the screwing portion 230 is located outside the base 100. In response to the rotation of the screwing portion 230, the screwing portion 230 drives the body 220 to rotate in the base 100 to the first position or the second position; referring to Figure 9 and Figure 10 , the connecting portion 320 sequentially passes through the screwing portion 230 and the body 220 and is fixedly connected to the base 100. The indicating cover plate 310 is attached to the surface of the screwing portion 230, and the rotation mark 250 is provided on the surface of the screwing portion 230.

[0087] By accommodating the body 220 in the base 100, a flow passage is formed by the cooperation of the groove 210 on the outer peripheral wall of the body 220 and the inner peripheral wall of the base 100, and the screwing portion 230 is located outside the base 100. In specific operations, medical staff can apply a rotational force to the screwing portion 230 to drive the body 220 to rotate circumferentially in the base 100 by using the screwing portion 230, which is simpler and more convenient than directly operating the body 220 to rotate circumferentially in the base 100. In some embodiments of the present disclosure, both the body 220 and the screwing portion 230 of the reversing knob 200 are cylindrical structures, and the central axes of the body 220 and the screwing portion 230 coincide with each other. Through this structural setting, when the screwing portion 230 drives the body 220 to rotate circumferentially in the base 100, the two can rotate coaxially, which is more labor-saving for the operator.

[0088] In some embodiments of the present disclosure, the radial dimension of the screwing portion 230 is greater than the radial dimension of the main body 220. The end portion of the base 100 includes an opening structure, and the main body 220 is accommodated in the base 100 through the opening structure, and the screwing portion 230 abuts against the end portion of the base 100. With this arrangement, by abutting the screwing portion 230 against the end portion of the base 100, the gap between the screwing portion 230 and the end portion of the base 100 is avoided, so that the main body 220 can be completely accommodated inside the base 100 through the opening structure without protruding from the base 100 through the opening structure. The structure of the entire liquid delivery device 10 is more compact, and the liquid delivery process is also more stable.

[0089] In some embodiments of the present disclosure, the screwing portion 230 includes a screwing body 231 and a fixed wall 232. The screwing body 231 abuts against the end portion of the base 100, and the fixed wall 232 is connected to the screwing body 231. Refer to Figure 10 and Figure 11 , along the axial direction of the main body 220, a receiving space 234 is formed between the portion of the main body 220 corresponding to the fixed wall 232 and the fixed wall 232, and the end portion of the base 100 is accommodated in the receiving space 234. Taking Figure 10 as a reference, the axial direction of the main body 220 is the up and down direction.

[0090] In actual design, the size of the receiving space 234 can be adjusted as needed to correspond to the thickness dimension of the end portion of the base 100, so that the end portion of the base 100 can be snapped into the receiving space 234, better restricting the degrees of freedom of the reversing knob 200 relative to the base 100 other than the rotational direction, and increasing the stability and reliability of the entire device during use.

[0091] For example, when the main body 220 of the reversing knob 200 is accommodated in the base 100, the screwing body 231 of the screwing portion 230 abuts against the end portion of the base 100. Since the radial dimension of the screwing body 231 is greater than the radial dimension of the end portion of the base 100, the screwing body 231 can completely cover and abut against the end portion of the base 100. The fixed wall 232 is a ring-shaped wall structure, and the fixed wall 232 is connected to the edge portion of the screwing body 231. When the screwing body 231 abuts against the end portion of the base 100, the fixed wall 232 is located outside the end portion of the base 100. Refer to Figure 10, the axial direction of the main body 220 is the up-down direction. If the length of the fixed wall 232 extending in the axial direction is L, the specific part of the main body 220 corresponding to the fixed wall 232 refers to: starting from the end of the main body 220 connected to the screwing main body 231, the part corresponding to the length L extended along the axial direction towards the other end of the main body 220. An annular accommodating space 234 can be formed between the part of the main body 220 corresponding to the fixed wall 232 and the fixed wall 232. When the main body 220 of the reversing knob 200 is inserted into the inside of the base 100, the screwing main body 231 of the screwing part 220 abuts against the end of the base 100, and the end of the base 100 can be accommodated in the accommodating space 234, thereby restricting the degrees of freedom of the reversing knob 200 relative to the base 100 except in the rotational direction.

[0092] In some embodiments of the present disclosure, referring to Figure 6 , Figure 15 and Figure 16 , a limiting member is provided on the outer wall surface of the base 100, and the limiting member includes a first limiting portion 141 and a second limiting portion 142. Referring to Figure 9 , Figure 11 and Figure 13 , the screwing part 230 is provided with a protruding portion 233. In response to the screwing part 230 rotating in the first direction, the protruding portion 233 is limited by the first limiting portion 141 to restrict the screwing part 230 from continuing to rotate in the first direction; in response to the screwing part 230 rotating in the second direction, the protruding portion 233 is limited by the second limiting portion 142 to restrict the screwing part 230 from continuing to rotate in the second direction.

[0093] In actual design, the setting positions of the first limiting portion 141 and the second limiting portion 142 can be adjusted according to specific needs, so as to limit the rotation range of the reversing knob 200. By setting such a physical limiting structure, the operation of medical staff is made more convenient. It only needs to rotate the reversing knob 200 along a specific direction until the protruding portion 233 on the screwing part 230 is limited by the first limiting portion 141 or the second limiting portion 142. The state that the reversing knob 200 cannot rotate any further indicates that the corresponding port has been connected, without the need for medical staff to observe carefully.

[0094] For example, referring to Figures 5 to 8, on the outer peripheral wall of the base 100, the injection port 110 and the output port 130 are oppositely arranged, and the connection port 120 is located between the injection port 110 and the output port 130 in the circumferential direction of the base 100. When the body 220 of the commutation knob 200 rotates within the base 100, the auxiliary passage section of the flow passage can be selectively communicated with the connection port 120 or the output port 130 as the body 220 rotates. At this time, if it is necessary to ensure that the main passage section of the flow passage is always communicated with the injection port 110, the body 220 only needs to rotate 180 degrees inside the base 100. Therefore, referring to Figure 15 and Figure 16 , the first limiting portion 141 and the second limiting portion 142 are oppositely arranged on the outer wall surface of the base 100, that is, the screwing portion 230 rotates from the position of the first limiting portion 141 to the position of the second limiting portion 142, and the rotation angle is 180 degrees. When the screwing portion 230 is at the position of the first limiting portion 141, the protruding portion 233 of the screwing portion 230 is limited by the first limiting portion 141. At this time, the screwing portion 230 can no longer rotate in the first direction. When the screwing portion 230 is at the position of the second limiting portion 142, the protruding portion 233 of the screwing portion 230 is limited by the second limiting portion 142. At this time, the screwing portion 230 can no longer rotate in the second direction.

[0095] In some embodiments of the present disclosure, the limiting member is a circumferentially extending annular protrusion 140. The two ends of the annular protrusion 140 are respectively the first limiting portion 141 and the second limiting portion 142. A protruding portion 233 is provided on the screwing portion 230 of the commutation knob 200. When the screwing portion 230 of the commutation knob 200 abuts against the end of the base 100 and rotates, the protruding portion 233 can be limited by the first limiting portion 141 and the second limiting portion 142, thereby restricting the rotation of the commutation knob 200 relative to the base 100.

[0096] For example, referring to Figure 15 , when the screwing portion 230 of the commutation knob 200 rotates in the first direction, that is, the clockwise direction in the figure, the protruding portion 233 of the screwing portion 230 can be limited by the first limiting portion 141. That is, when the protruding portion 233 reaches the position of the first limiting portion 141, the screwing portion 230 can no longer continue to rotate clockwise; when the protruding portion 233 is limited by the first limiting portion 141, the commutation knob 200 is correspondingly rotated to the first position. At this time, the flow passage connects the injection port 110 and the connection port 120, and the injection device 20 is connected to the accommodating device 30.

[0097] For another example, referring to Figure 16When the screwing part 230 rotates in the second direction, i.e., the counterclockwise direction in the figure, the protruding part 233 of the screwing part 230 can be limited by the second limiting part 142. That is, when the protruding part 233 reaches the position of the second limiting part 142, the screwing part 230 can no longer rotate counterclockwise. When the protruding part 233 is limited by the second limiting part 142, the corresponding reversing knob 200 is rotated to the second position. At this time, the flow channel connects the injection port 110 and the output port 130, and the injection device 20 is connected to the conveying device 40.

[0098] In summary, this embodiment discloses a liquid conveying device 10, which includes a base 100, a reversing knob 200 and a fixing member 300. The base 100 is provided with an injection port 110, a connection port 120 and an output port 130. A groove 210 is formed on the outer peripheral wall of the body 220 of the reversing knob 200. When the body 220 is rotatably received in the base 100, it is more convenient for the groove 210 to cooperate with the inner peripheral wall of the base 100 to form a flow channel, and at the same time, a threading space is left inside the reversing knob 200 for the fixing member 300 to pass through. When the connecting part 320 of the fixing member 300 passes through the reversing knob 200 and is fixedly connected to the base 100, the indicating cover plate 310 is attached to the surface of the reversing knob 200, which can limit the axial movement of the reversing knob 200 relative to the base 100. At this time, the body 220 of the reversing knob 200 can only rotate inside the base 100, thereby preventing the reversing knob 200 from detaching from the base 100.

[0099] The body 220 of the reversing knob 200 can be rotated to a first position and a second position inside the base 100. When the body 220 rotates to the first position, the flow channel connects the injection port 110 and the connection port 120. When the body 220 rotates to the second position, the flow channel connects the injection port 110 and the output port 130. In this disclosure, by forming the groove 210 on the outer peripheral wall of the body 220, using the groove 210 to cooperate with the inner peripheral wall of the base 100 to form a flow channel, and then passing the fixing member 300 through the reversing knob 200 to limit the axial movement of the reversing knob 200 relative to the base 100, it can better ensure that the body 220 accurately switches between the first position and the second position inside the base 100, avoiding axial misalignment between the flow channel and the corresponding port, resulting in the flow channel being unable to connect the corresponding port when the body 220 rotates inside the base 100, and improving the stability and reliability of the entire liquid conveying device 10 during use. At the same time, during the rotation of the reversing knob 200, the rotation mark 250 on the reversing knob 200 cooperates with the indicating mark 311 on the indicating cover plate 310 to indicate that the body 220 is in the first position or the second position, so that medical staff can know the port connection situation on the body 220, avoiding the situation of incorrect port connection during operation, and improving the operation efficiency and accuracy of medical staff.

[0100] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0101] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present disclosure, and they are not intended to limit the protection scope of the present disclosure. Any equivalent embodiments or changes made without departing from the technical spirit of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A liquid delivery device, characterized in that: It comprises a base, a reversing knob and a fixing piece, wherein the base is provided with an injection port, a connection port and an output port; The body of the reversing knob is rotatably accommodated in the base, the outer wall of the body is provided with a groove, and the groove cooperates with the inner wall of the base to form a flow channel; the body has a first position and a second position, in response to the body rotating to the first position, the flow channel connects the injection port with the connection port, and in response to the body rotating to the second position, the flow channel connects the injection port with the output port; The fixing member comprises an indicating cover plate and a connecting portion connected to each other, the connecting portion is passed through the reversing knob and fixedly connected to the base, the indicating cover plate is attached to the surface of the reversing knob, the surface of the reversing knob is provided with a rotation mark, and the indicating cover plate is provided with an indicating mark; In response to the body of the reversing knob rotating relative to the base, the rotation mark and the indication mark cooperate with each other to indicate that the body is in the first position or in the second position.

2. The liquid delivery device according to claim 1, characterized in that: The material of the indicating cover plate is a transparent material, the indicating direction of the rotating mark is a first direction, and the indicating direction of the indicating mark is a second direction; In response to the body of the reversing knob rotating relative to the base, when the angle between the first direction and the second direction is a first preset angle, it indicates that the body is in the first position; when the angle between the first direction and the second direction is a second preset angle, it indicates that the body is in the second position.

3. The liquid delivery device according to claim 2, characterized in that: Along the circumferential direction of the base, the injection port and the output port are arranged opposite to each other, the connecting port is arranged at a position between the injection port and the output port, the second direction is arranged toward the injection port, the first preset angle is 90 degrees, and the second preset angle is 180 degrees.

4. The liquid delivery device according to claim 1, characterized in that: The indicator mark includes a first hollow portion and a second hollow portion provided on the indicator cover plate, wherein the first hollow portion and the second hollow portion are spaced apart circumferentially on the indicator cover plate; In response to the body of the reversing knob rotating relative to the base, the rotation mark is located at the position of the first hollow portion, indicating that the body is in the first position, and the rotation mark is located at the position of the second hollow portion, indicating that the body is in the second position.

5. The liquid delivery device according to claim 4, characterized in that: The first hollow portion is disposed on the indication cover plate corresponding to the connection port, and the second hollow portion is disposed on the indication cover plate corresponding to the output port.

6. The liquid delivery device according to any one of claims 1 to 5, characterized in that: The injection port, the connection port and the output port are all arranged on the side wall of the base, and the injection port, the connection port and the output port are staggered along the axial direction of the base; The flow channel includes a main passage section and an auxiliary passage section, the main passage section extends along the circumferential direction of the body, the main passage section is arranged corresponding to the injection port along the axial direction of the base, the main passage section and the injection port are communicated with each other, or in response to the rotation of the body, the main passage section and the injection port are communicated with each other; The auxiliary passage section extends at least along the axial direction of the body and is connected to the main passage section. In response to the body rotating to the first position, the auxiliary passage section is connected to the connection port. In response to the body rotating to the second position, the auxiliary passage section is connected to the output port.

7. The liquid delivery device according to claim 6, characterized in that: The auxiliary passage section and the main passage section are arranged perpendicular to each other.

8. The liquid delivery device according to claim 1, characterized in that: The reversing knob further comprises a screwing portion connected to the body, the screwing portion being located outside the base; in response to the rotation of the screwing portion, the screwing portion drives the body to rotate in the base to the first position or the second position; The connecting portion is sequentially arranged through the screwing portion and the body and is fixedly connected to the base. The indicating cover is attached to the surface of the screwing portion, and the rotation mark is arranged on the surface of the screwing portion.

9. The liquid delivery device according to claim 8, characterized in that: The radial dimension of the screwing portion is greater than the radial dimension of the body, the end of the base includes an opening structure, the body is accommodated in the base through the opening structure, and the screwing portion abuts against the end of the base.

10. The liquid delivery device according to claim 8, characterized in that: The outer wall surface of the base is provided with a limiting member, the limiting member includes a first limiting portion and a second limiting portion, and the screwing portion is provided with a protrusion; In response to the screwing portion rotating along the first direction, the protrusion is limited by the first limiting portion to limit the screwing portion from continuing to rotate along the first direction; In response to the screwing portion rotating along the second direction, the protrusion is limited by the second limiting portion to limit the screwing portion from continuing to rotate along the second direction.

11. The liquid delivery device according to claim 10, characterized in that: The limiting member is an annular protrusion extending circumferentially on the outer wall surface of the base, and the two ends of the annular protrusion are the first limiting portion and the second limiting portion respectively.

12. The liquid delivery device according to claim 8, characterized in that: The screwing part includes a screwing body and a fixed wall, the screwing body abuts against an end of the base, and the fixed wall is connected to the screwing body; Along the axial direction of the body, an accommodation space is formed between a portion of the body corresponding to the fixed wall and the fixed wall, and an end portion of the base is accommodated in the accommodation space.

13. The liquid delivery device according to claim 8, characterized in that: The body and the screwing part are both column structures, and the central axes of the body and the screwing part coincide with each other.

14. The liquid delivery device according to claim 1, characterized in that: The injection port is used to connect to an injection device, the connection port is used to connect to a containing device, and the output port is used to connect to a delivery device.

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