Universal closed pipetting connector and dispensing and pipetting system thereof

Abstract

The utility model discloses a universal closed pipetting connector and a medicine dispensing and pipetting system thereof, and relates to the field of medical medicine dispensing and pipetting devices. According to the utility model, the connecting needle tube, the connecting needle seat, the sealing plug and the sealing cap are arranged in the pipetting connector, so that the connecting needle tube can be used for puncturing medicament bottles with different bottle opening sizes and bottle opening position specifications, and the medicament bottles are communicated with the cavity structure in the connecting needle seat; a sealing plug is arranged at the rear end of the cavity structure so as to be communicated with medical instruments such as a liquid medicine transfer device, and meanwhile, a sealing cap surrounds a connecting needle tube and is propped against a bottle opening of a medicament bottle so as to ensure the connection leakproofness between the pipetting connector and the medicament bottle, so that the universal connection between the pipetting connector and the medicament bottle is realized; the universal connection of the pipetting connector and the medical instrument is realized, and meanwhile, the sealing performance of the connection is ensured.

Description

Technical Field

[0001] The utility model relates to the field of medical dispensing and liquid transfer devices, in particular to a universal closed liquid transfer connector and a dispensing and liquid transfer system thereof. Background Art

[0002] The main method of dispensing liquid medicine is to mix the liquid medicines in different medicine containers as required by using tools such as syringes. In the process of dispensing medicine, injecting liquid medicine into the medicine bottle will form a positive high pressure in the medicine bottle, and extracting liquid medicine from the medicine bottle will form a negative high pressure in the medicine bottle. Therefore, since the pressure of the medicine bottle is not balanced with the atmospheric pressure, it will easily lead to the leakage of dangerous liquid medicine, thus causing the risk of leakage.

[0003] In order to achieve air pressure balance in the medicine bottle and the medicine liquid transfer device, one type of medicine liquid transfer device includes a syringe, a needle holder, a gas needle tube and a liquid needle tube. Among them, the distal end of the gas needle tube will be inserted into the medicine bottle together with the distal end of the liquid needle tube, and the proximal end of the gas needle tube can be connected to an air bag or directly connected to the atmosphere. When this type of medicine liquid transfer device is in use, after the liquid needle tube extracts the medicine liquid, the gas will be replenished into the medicine bottle from the gas needle tube, and after the liquid needle tube injects the medicine liquid, the gas in the medicine bottle will discharge the gas needle tube.

[0004] This type of liquid medicine transfer device is also equipped with a needle sealing assembly to prevent leakage from the dispensing needle during insertion and removal. However, the specifications of medicine bottles are often diverse. For example, the size of the bottle mouth of an infusion bottle varies from large to small. For another example, an infusion bottle can be provided with a single needle mouth, two needle mouths, and three needle mouths. An infusion bottle with multiple needle mouths allows multiple needle bodies from different medical devices to be inserted simultaneously.

[0005] Therefore, the liquid medicine transfer device often cannot match the specifications of the medicine bottle well, resulting in that the needle sealing component cannot fit tightly with the mouth of the medicine bottle during use, resulting in the risk of leakage of the dispensing needle. Utility Model Content

[0006] In view of this, the main purpose of the utility model is to provide a universal closed type pipetting connector, which can connect a liquid medicine transfer device to medicine bottles of different specifications, not only ensuring the airtightness of the connection between the liquid medicine transfer device and the pipetting connector, but also ensuring the airtightness of the connection between the pipetting connector and medicine bottles of different specifications.

[0007] A secondary purpose of the utility model is to provide a drug dispensing and pipetting system including the above-mentioned universal closed type pipetting connector, which includes a drug liquid transferor, which can balance the air pressure of the medicine bottle when the drug liquid is running, and avoid leakage of the drug dispensing needle during the operation of the drug liquid. At the same time, the drug liquid transferor can be sealed and connected to medicine bottles of different specifications through the pipetting connector.

[0008] In the first aspect, in order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a universal closed liquid transfer connector, including a connecting needle tube, a connecting needle seat, a sealing plug and a closing cap;

[0009] The connecting needle seat is provided with a cavity structure opening toward the rear end;

[0010] The connecting needle tube is fixedly connected to the front end of the connecting needle seat and communicated with the cavity structure of the connecting needle seat;

[0011] The sealing plug is made of elastic material, fixedly connected to the rear end of the connecting needle seat and blocks the opening of the cavity structure;

[0012] The closing cap is made of elastic material, is sleeved outside the connecting needle tube, and is fixedly connected to the front end of the connecting needle seat.

[0013] In the present invention, unless otherwise specified, the front and front end refer to the end to which the needle tip of the needle tube points, and the rear and rear end refer to the other end opposite thereto.

[0014] The above-mentioned pipetting connector is optional, and the diameter of the cavity structure connecting the needle seat gradually increases from front to back.

[0015] The above-mentioned pipetting connector can optionally be provided with a slot on the outer side wall of the connecting needle seat, and a radially inward flange is provided at the rear end opening of the closing cap, and the flange of the closing cap and the slot of the connecting needle seat are interference fit with each other to fix the closing cap to the connecting needle seat.

[0016] Optionally, the above-mentioned pipetting connector has an outer side wall of the connecting needle seat provided with a jacket, and the jacket is a cap-shaped structure coaxial with the connecting needle tube and opening forward.

[0017] Furthermore, the front end of the outer sleeve is axially symmetrically provided with two holding wings, and the two holding wings open from the center toward the outside.

[0018] Furthermore, a raised stripe extending in the radial direction is arranged on the outward side of the holding wing.

[0019] The above-mentioned pipetting connector may optionally further include a sealing cover, wherein the rear end of the connecting needle seat is provided with a side enclosure extending rearward, and the sealing plug is cooperatedly arranged inside the side enclosure; the sealing cover is cooperatedly arranged outside the side enclosure, fixedly connected to the connecting needle seat, and abuts against the rear end of the sealing plug; a through hole is provided in the middle of the sealing cover so that the sealing plug is exposed through the through hole.

[0020] Furthermore, the rear end of the connecting needle seat is provided with an annular boss, and the rear end of the sealing plug is provided with an annular groove, and the annular boss and the annular groove cooperate with each other so that the sealing plug blocks the opening of the cavity structure.

[0021] In a second aspect, in order to achieve the above-mentioned object, the utility model adopts the following technical solution: a dispensing and liquid transfer system, comprising the above-mentioned liquid transfer connector, and also comprising a liquid medicine transfer device, wherein the liquid medicine transfer device comprises a double-chamber syringe, a dispensing needle assembly and a needle sealing assembly;

[0022] The double-chamber syringe is composed of a first syringe and a first piston rod that can slide forward and backward along the inner cavity of the first syringe, a second syringe and a second piston rod that can slide forward and backward along the inner cavity of the second syringe, and the first syringe and the second syringe are arranged side by side and in the same direction;

[0023] The dispensing needle assembly comprises an injection needle seat, a first needle tube and a second needle tube, wherein the first needle tube and the second needle tube are fixedly arranged at the front end of the injection needle seat extending in the front-back direction, and the injection needle seat is used to connect the first needle tube to the first syringe and connect the second needle tube to the second syringe;

[0024] The needle sealing assembly comprises a sliding sleeve and a sealing member, the rear end of the sliding sleeve can be axially slidably arranged on the outer side wall of the injection needle seat, and the sealing member is fixedly arranged on the front end of the sliding sleeve; the needle sealing assembly is installed on the dispensing needle assembly, so that when the sliding sleeve slides to the front part relative to the injection needle seat, the sealing member tightly wraps the front end openings of the first needle tube and the second needle tube, and when the sliding sleeve slides to the rear part relative to the injection needle seat, the front end openings of the first needle tube and the second needle tube pass through the sealing member;

[0025] The liquid transfer connector is detachably connected to the sliding sleeve of the needle sealing component, and when connected, the first needle tube and the second needle tube face the sealing plug of the liquid transfer connector.

[0026] The above-mentioned drug dispensing and pipetting system is optional, and the pipetting connector is provided with a slope along the circumferential direction on one side of the first opening; a hook is provided on the front end outer edge of the sliding sleeve; the slope and the hook cooperate with each other so that the pipetting connector can be detachably connected to the needle sealing component when the hook slides from the thinner part of the slope to the thicker part; a limiting block is provided at the thicker part of the slope.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] (1) The liquid transfer connector of the utility model is provided with a connecting needle tube, a connecting needle seat, a sealing plug and a closing cap. The connecting needle tube can be used to pierce medicine bottles of various bottle mouth sizes and bottle mouth position specifications, and the medicine bottle can be connected to the cavity structure in the connecting needle seat. The rear end of the cavity structure is provided with a sealing plug for connection to medical devices such as a liquid medicine transfer device. At the same time, the closing cap surrounds the connecting needle tube and abuts against the bottle mouth of the medicine bottle to ensure the airtightness of the connection between the liquid transfer connector and the medicine bottle, thereby realizing the universal connection between the liquid transfer connector and the medicine bottle, and the universal connection between the liquid transfer connector and the medical device, while ensuring the airtightness of the connection.

[0029] (2) The drug dispensing and liquid transfer system of the utility model comprises a drug liquid transfer device and a liquid transfer connector. The drug liquid transfer device can be tightly fitted on the sealing plug of the liquid transfer connector to prevent leakage of the transferred drug liquid. At the same time, the drug liquid transfer device can be connected to drug bottles of various different bottle mouth sizes and bottle mouth position specifications with the help of the liquid transfer connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the cross-sectional structure of the initial state of the liquid transfer connector according to an embodiment of the utility model;

[0031] Figure 2 A schematic cross-sectional view of the use state of the pipetting connector according to an embodiment of the utility model;

[0032] Figure 3 An exploded three-dimensional structural diagram of a pipetting connector according to an embodiment of the utility model;

[0033] Figure 4a Representative physical diagram of a pipetting connector according to an embodiment of the utility model;

[0034] Figure 4b A representative physical diagram of a pipetting connector according to an embodiment of the present invention.

[0035] Figure 5 A schematic cross-sectional view of a liquid medicine transfer device according to an embodiment of the present utility model;

[0036] Figure 6 A schematic cross-sectional structure diagram of a first connection state of a medication dispensing and liquid transfer system according to an embodiment of the utility model;

[0037] Figure 7 A schematic cross-sectional structure diagram of a second connection state of a medication dispensing and liquid transfer system according to an embodiment of the utility model.

[0038] : Illustration numerals: 10, connecting needle tube; 20, connecting needle seat; 21, cavity structure; 22, slot; 23, annular boss; 24, outer sleeve; 241, holding wing; 242, raised stripe; 25, side skirt; 30, sealing plug; 31, annular groove; 40, closing cap; 42, flange; 50, sealing cover; 51, through hole; 52, slope; 53, limit block; 60, double-chamber syringe; 61, first injection cylinder; 62, first piston rod; 63, second injection cylinder; 64, second piston rod; 70, dispensing needle assembly; 71, injection needle seat; 72, first needle tube; 73, second needle tube; 80, needle sealing assembly; 81, sliding sleeve; 82, sealing piece; 83, hook; 91, first medicine bottle; 92, second medicine bottle. DETAILED DESCRIPTION

[0039] In order to better illustrate the purpose, technical solution and advantages of the utility model, the specific implementation of the utility model is further described in detail below in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but are not intended to limit the scope of the utility model.

[0040] like Figure 5 As shown, a liquid medicine transfer device is provided. The liquid medicine transfer device is composed of a double-chamber syringe 60, a dispensing needle assembly 70 and a needle sealing assembly 80. The liquid medicine transfer device is often used to transport hazardous liquid medicines. When the liquid medicine transfer device is inserted into or pulled out of a medicine bottle, the liquid medicine is easy to leak from the dispensing needle assembly 70. For this reason, the liquid medicine transfer device is provided with a needle sealing assembly 80. The needle sealing assembly 80 comprises a sliding sleeve 81 and a sealing member 82. The sliding sleeve 81 is a through structure along the front-to-back direction. The sealing member 82 is made of an elastic material and is fixed to the front end of the sliding sleeve. The rear end of the sliding sleeve 81 can be axially slidably arranged on the outer side wall of the needle seat. In the initial state, the sliding sleeve 81 is located at the front side of the sliding stroke, and the sealing member 82 will tightly wrap the front end opening of the dispensing needle assembly 70. When dispensing begins, the front end of the liquid medicine transfer device is aligned with and applies pressure toward the opening of the medicine bottle, and the sliding sleeve 81 slides backward relative to the needle seat, so that the front end opening of the dispensing needle assembly 70 pierces the sealing member 82 and penetrates into the medicine bottle. When dispensing is completed, the liquid medicine transfer device is pulled backward relative to the medicine bottle, and the sliding sleeve 81 slides forward relative to the needle seat (manually or under the action of spring elasticity), so that the sealing member 82 re-wraps the front end opening of the dispensing needle assembly 70, thereby preventing the dispensing needle assembly 70 from leaking liquid medicine during the dispensing process.

[0041] refer to Figure 6 , showing the structure of the first medicine bottle 91. The mouth of the first medicine bottle 91 is provided with a bottle cap and a sealing gasket. The bottle cap is provided with a puncture hole, through which the needle can pierce the sealing gasket and enter the first medicine bottle 91. It is worth noting that there is a certain height difference between the bottle cap and the sealing gasket, so that the front end surface of the closure member 82 of the needle sealing assembly 80 is difficult to directly fit the sealing gasket, and causes leakage in the gap when the liquid medicine is transferred. It is understandable that the aperture specifications of the puncture hole are various, and it is difficult to configure a dedicated connector. Reference Figure 7 , showing the structure of the second medicine bottle 92. Compared with the first medicine bottle 91, the second medicine bottle 92 is provided with two puncture holes, so that the dispensing device and the infusion device can use different puncture holes. At the same time, it can be understood that the puncture hole of the first medicine bottle 91 is located at the center of the bottle mouth, while the puncture holes of the second medicine bottle 92 are not at the center of the bottle mouth, and it is difficult for the connector to match the positions of different puncture holes.

[0042] like Figures 1 to 3As shown, in order to ensure the airtightness of the connection between the pipette connector and medicine bottles of different specifications, according to the embodiment of the utility model, a universal closed pipette connector is provided. The pipette connector comprises a connecting needle tube 10, a connecting needle seat 20, a sealing plug 30 and a closing cap 40. Among them, a cavity structure 21 opening toward the rear end is provided in the connecting needle seat 20, the connecting needle tube 10 is fixedly connected to the front end of the connecting needle seat 20 and communicated with the cavity structure 21 of the connecting needle seat 20, the sealing plug 30 made of elastic material is fixedly connected to the rear end of the connecting needle seat 20 and blocks the opening of the cavity structure 21, and the closing cap 40 made of elastic material is sleeved outside the connecting needle tube 10 and fixedly connected to the front end of the connecting needle seat 20.

[0043] It can be understood that in this embodiment, reference Figure 1 The cavity structure 21 of the connecting needle seat 20 is connected to the lumen of the connecting needle tube 10, and the rear end of the cavity structure 21 is sealed by the sealing plug 30. The rear end of the closing cap 40 is fixed to the connecting needle seat 20 and completely wraps the connecting needle tube 10 therein. Figure 2 , hold the connecting needle seat 20, pierce the front end of the closing cap 40 toward the mouth of the medicine bottle, and the closing cap 40 can be closely abutted against the sealing pad of the medicine bottle. At the same time, since the closing cap 40 is made of elastic material, the front end of the closing cap 40 will move backward, and the middle part of the closing cap 40 will fold and form an elastic force squeeze on the sealing pad, and play a further role in preventing leakage. Relative to the backward movement of the closing cap 40, the connecting needle tube 10 will move forward, pierce the front end of the closing cap 40 and the sealing pad of the medicine bottle together, and finally enter the inside of the medicine bottle, connecting the medicine bottle with the cavity structure 21. The liquid medicine will flow from the medicine bottle into the cavity structure 21 of the connecting needle seat 20, and be sealed in the cavity structure 21 under the action of the sealing plug 30. Medical instruments such as liquid medicine transfer devices, infusion sets, and syringes can uniformly pierce the sealing plug 30, and extract or inject liquid medicine from the cavity structure 21. When the liquid medicine transfer device is used, the needle sealing component 80 and the sealing plug 30 can be sealed against each other, and the dispensing needle component 70 can pass through the sealing component 82 and the sealing plug 30 in sequence and enter the cavity structure 21 without being exposed to the outside. It should be noted that once the liquid transfer connector is connected to the medicine bottle, it will no longer be removed, but will replace the bottle mouth of the medicine bottle to become the connection port of the medicine bottle.

[0044] It can be seen that in the universal closed pipetting connector of the present embodiment, by providing a connecting needle tube 10, a connecting needle seat 20, a sealing plug 30 and a closing cap 40, the connecting needle tube 10 can be used to pierce medicine bottles of various bottle mouth sizes and bottle mouth position specifications, and the medicine bottle can be connected to the cavity structure 21 in the connecting needle seat 20, and the rear end of the cavity structure 21 is provided with a sealing plug 30 for connection to medical devices such as a liquid medicine transfer device. At the same time, the closing cap 40 surrounds the connecting needle tube 10 and abuts against the bottle mouth of the medicine bottle to ensure the airtightness of the connection between the pipetting connector and the medicine bottle, thereby realizing the universal connection between the pipetting connector and the medicine bottle, and the universal connection between the pipetting connector and the medical device, while ensuring the airtightness of the connection.

[0045] Specifically, in this embodiment, reference Figure 1 and Figure 2 The connecting needle seat 20 is provided with a cavity structure 21 that can accommodate liquid medicine. The front end diameter of the cavity structure 21 is relatively small, the rear end diameter of the cavity structure 21 is relatively large, and the diameter of the middle part of the cavity structure 21 gradually increases. The sealing plug 30 can completely block the rear end opening of the cavity structure 21. Since the front end of the cavity structure 21 is provided with a connecting needle tube 10 and is connected to the medicine bottle by the connecting needle tube 10, the size can be set to be relatively small, while the rear end of the cavity structure 21 is not only used to replace the mouth of the medicine bottle and communicate with various medical instruments, but also used to be sealed and fitted with the needle sealing component 80 of the liquid medicine transfer device, so the size can be set to be relatively large.

[0046] Specifically, in this embodiment, reference Figure 1 and Figure 3 , the outer side wall of the connecting needle seat 20 is provided with a cap-shaped outer sleeve 24. The rear end of the outer sleeve 24 is closed and connected to the rear end side of the connecting needle seat 20. The side of the outer sleeve 24 is a circular cylinder, and the front end of the outer sleeve 24 is open and coaxial with the connecting needle tube 10. The front end of the outer sleeve 24 is axially symmetrically provided with two gripping wings 241, and the two gripping wings 241 are opened from the center to the outside, and the outer side of the gripping wings 241 is provided with multiple raised stripes 242 extending radially. When in use, the operator can put his fingers on the two gripping wings 241 and push the pipetting connector forward to control the connecting needle tube 10 to pierce the medicine bottle. The raised stripes 242 are perpendicular to the direction of thrust application to increase the friction of the operation. The gripping wings 241 opened from the center to the outside and the raised stripes 242 can prevent hand slippage and improve the stability of gripping. At the same time, the diameter of the outer sleeve 24 is configured to be slightly larger than the diameter of the bottle mouth of the medicine bottle. When the connecting needle tube 10 is completely inserted into the medicine bottle, the outer sleeve 24 can be used to surround the bottle mouth of the medicine bottle, thereby further preventing the leakage of the liquid medicine.

[0047] Specifically, in this embodiment, reference Figure 1, the outer wall of the connecting needle seat 20 is provided with a slot 22, and the rear end opening of the closing cap 40 is provided with a radially inward flange 42. The size of the flange 42 of the closing cap 40 is slightly smaller than the size of the slot 22 of the connecting needle seat 20, and the two are interference fit. The rear end of the closing cap 40 is sleeved outside the connecting needle tube 10 and the connecting needle seat 20 from front to back, and the flange 42 of the closing cap 40 is clamped on the slot 22 on the outer side of the rear part of the connecting needle seat 20. At the same time, since the diameter of the cavity structure 21 gradually increases from front to back, the outer side of the rear part of the connecting needle seat 20 also gradually increases accordingly. The rear part of the closing cap 40 is also set as a trumpet-shaped expansion section facing backward, and is tightly fitted with the outer side wall of the needle seat to prevent the displacement of the closing cap 40 and prevent leakage.

[0048] Specifically, in this embodiment, reference Figure 1 and Figure 3 , the pipetting connector also includes a sealing cover 50. The sealing cover 50 is used to fix the sealing plug 30 to the pipetting needle seat in a sealed manner, and provide a through hole 51 for puncturing the sealing plug 30. To this end, the rear end of the connecting needle seat 20 is provided with a side enclosure 25 extending backward. The sealing plug 30 is installed in the side enclosure 25, and the sealing cover 50 covers and matches the outside of the side enclosure 25 and is fixedly connected to the connecting needle seat 20. The sealing cover 50 abuts against the rear end of the sealing plug 30, so that the sealing cover 50 is squeezed and deformed toward the front side, forming a closed blockage of the rear end opening of the cavity structure 21. To this end, a through hole 51 is also provided in the middle of the sealing cover 50, so that the sealing plug 30 is exposed through the through hole 51. The diameter of the through hole 51 is configured to be at least larger than the front end size of the liquid medicine transfer device sealing member 82. Generally, the through hole 51 of the sealing cover 50 is also suitable for simultaneous puncture of multiple medical instruments.

[0049] In order to improve the airtightness, the rear end of the connecting needle seat 20 is provided with an annular boss 23, and the rear end of the sealing plug 30 is provided with an annular groove 31. The annular boss 23 and the annular groove 31 cooperate with each other so that the sealing plug 30 blocks the opening of the cavity structure 21. It can be understood that the height of the annular boss 23 is configured to be slightly greater than the depth of the annular groove 31, and the top of the annular boss 23 will be tightly abutted against the bottom of the annular groove 31, thereby enhancing the airtightness.

[0050] Figure 4a and Figure 4b This is a representative physical picture of the pipetting connector. Figure 4a This is a real picture of the sample from the front view in the assembled state. Figure 4b This is a physical picture of the sample in a split state.

[0051] like Figures 5 to 7 As shown, according to an embodiment of the utility model, a drug dispensing and liquid transfer system is also provided. The drug dispensing and liquid transfer system comprises a drug liquid transfer device and the liquid transfer connector of the above embodiment.

[0052] In detail, the dual-chamber syringe 60 includes a first syringe 61, a first piston rod 62, a second syringe 63, and a second piston rod 64. The first syringe 61 and the second syringe 63 are arranged side by side and extend in the same direction. The first piston rod 62 can slide forward and backward in the inner cavity of the first syringe 61, and the second piston rod 64 can slide forward and backward in the inner cavity of the second syringe 63. A dispensing needle assembly 70 is installed at the front end of the dual-chamber syringe 60.

[0053] In detail, the dispensing needle assembly 70 includes an injection needle seat 71, a first needle tube 72, and a second needle tube 73. The first needle tube 72 and the second needle tube 73 both extend in the front-to-back direction, the first needle tube 72 is sleeved on the outside of the second needle tube 73, and the rear ends of the first needle tube 72 and the second needle tube 73 are respectively fixed to the front end of the injection needle seat. The rear end of the injection needle seat 71 is fixed to the front end of the double-chamber syringe 60, and by means of the setting of the internal channel of the injection needle seat 71, on the one hand, the rear end of the inner cavity between the inner wall of the first needle tube 72 and the outer wall of the second needle tube 73 is connected to the first syringe 61, and on the other hand, the rear end of the inner cavity of the second needle tube 73 is also connected to the second syringe 63. In other embodiments, the first needle tube 72 and the second needle tube 73 both extend in the front-to-back direction and are arranged side by side with each other at a preset phase spacing, and their rear ends are respectively fixed to the front end of the injection needle seat 71.

[0054] In detail, the needle sealing assembly 80 includes a sliding sleeve 81 and a sealing member 82. The sliding sleeve 81 is a through structure along the front-to-back direction. The sealing member 82 is made of elastic material and is fixed to the front end of the sliding sleeve 81. The rear end of the sliding sleeve 81 is axially slidably arranged on the outer side wall of the injection needle seat 71. In the initial state, the sliding sleeve 81 is located at the front side of the sliding formation, and the sealing member 82 will tightly wrap the front end openings of the first needle tube 72 and the second needle tube 73. When the dispensing starts, the front end of the liquid medicine transfer device is aligned and applies pressure toward the opening of the medicine bottle, and the sliding sleeve 81 will slide backward relative to the injection needle seat 71, so that the front end openings of the first needle tube 72 and the second needle tube 73 pierce the sealing member 82 and penetrate into the inside of the medicine bottle. When the dispensing is completed, the drug liquid transferor is pulled backward relative to the medicine bottle, and the sliding sleeve 81 will slide forward relative to the injection needle seat 71 (manually or under the action of spring force), so that the sealing member 82 re-wraps the front end openings of the first needle tube 72 and the second needle tube 73, thereby preventing the dispensing needle assembly 70 from leaking drugs during the dispensing process.

[0055] In detail, the liquid transfer connector and the liquid medicine transfer device are respectively provided with a detachable structure. Specifically, the outer edge of the sealing cover 50 of the liquid transfer connector is provided with two relative slopes 52 along the circumferential direction, and the front end outer edge of the sliding sleeve 81 of the needle sealing component 80 is provided with two relative hooks 83. The positions of the slope 52 and the hooks 83 cooperate with each other, so that the hooks 83 can rotate from the thinner part of the slope 52 to the thicker part, so that the hooks 83 clamp the slope 52. The two slopes 52 are arranged on the radial plane relative to the sealing plug 40, and the two hooks 83 are arranged on the sliding radial plane relative to the sliding sleeve 81, so that when the slope 52 is buckled with the hooks 83, the first needle tube 72 and the second needle tube 73 are both facing the sealing plug 40 of the liquid transfer connector.

[0056] like Figure 6 and Figure 7 As shown, for ease of understanding, the process of using the drug dispensing and liquid transfer system of this embodiment is as follows:

[0057] (1) Insert the pipette connector into the medicine bottle. The pipette connector can be inserted into the first medicine bottle 91 or the second medicine bottle 92 without being limited by the position of the mouth of the medicine bottle. Whether it is the first medicine bottle 91 or the second medicine bottle 92, the diameter of the mouth of the bottle is relatively small, but the pipette connector is connected by connecting the needle tube 10 and can be adapted to various sizes. At the same time, when the pipette connector is inserted into the medicine bottle, the closure cap 40 can be tightly abutted against the sealing gasket of the medicine bottle to prevent leakage during the puncture process.

[0058] (2) Fix the liquid medicine transfer device on the pipetting connector. The hook 83 of the liquid medicine transfer device can be inserted into the slope 52 of the pipetting connector. At the same time, the first needle tube 72 and the second needle tube 73 can be aligned with the through hole 51 of the sealing cover 50. The first needle tube 72, the second needle tube 73, the sealing plug 30 and the cavity structure 21 extend in the same direction. At the same time, the sealing member 82 of the liquid medicine transfer device will be tightly abutted against the sealing plug 30 of the pipetting connector.

[0059] (3) Push the liquid medicine transfer device so that the first needle tube 72 and the second needle tube 73 pierce the sealing member 82 and the sealing plug 30 together and enter the cavity structure 21. This will prevent the first needle tube 72 and the second needle tube 73 from leaking liquid medicine.

[0060] (4) Push the first piston rod 62 and the second piston rod 64 to prepare the liquid medicine. The first syringe 61, the needle seat and the first needle tube 72 are interconnected, and the second syringe 63, the needle seat and the second needle tube 73 are also interconnected. When in use, the first needle tube 72 and the second needle tube 73 can be punctured into the medicine bottle at the same time. When the first piston rod 62 is actively pushed to slide back and forth, the first syringe 61 will be used to draw the liquid medicine, and the second syringe 63 will be used to replenish or exhaust air to achieve pressure balance in the medicine bottle.

[0061] It can be seen that the drug dispensing pipetting system of the utility model can connect the drug liquid transferor to medicine bottles of different specifications through the setting of the pipetting connector, thereby improving the versatility of the drug dispensing pipetting system on the basis of achieving drug dispensing air pressure balance and needle leakage prevention.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] The above embodiments mainly describe the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A universal closed liquid transfer connector, characterized in that: It comprises a connecting needle tube (10), a connecting needle seat (20), a sealing plug (30) and a closing cap (40); The connecting needle seat (20) is provided with a cavity structure (21) opening toward the rear end; The connecting needle tube (10) is fixedly connected to the front end of the connecting needle seat (20) and is communicated with the cavity structure (21) of the connecting needle seat (20); The sealing plug (30) is made of elastic material, fixedly connected to the rear end of the connecting needle seat (20) and blocks the opening of the cavity structure (21); The closing cap (40) is made of elastic material, is sleeved outside the connecting needle tube (10), and is fixedly connected to the front end of the connecting needle seat (20).

2. The pipetting connector according to claim 1, characterized in that: The diameter of the cavity structure (21) connecting the needle seat (20) gradually increases from front to back.

3. The pipetting connector according to claim 1, characterized in that: The outer wall of the connecting needle seat (20) is provided with a slot (22), and the rear end opening of the closing cap (40) is provided with a radially inward flange (42), and the flange (42) of the closing cap (40) and the slot (22) of the connecting needle seat (20) are interference-fitted with each other, so that the closing cap (40) is fixedly connected to the connecting needle seat (20).

4. The pipetting connector according to claim 1, characterized in that: The outer side wall of the connecting needle seat (20) is provided with an outer sleeve (24), and the outer sleeve (24) is a cap-shaped structure that is coaxial with the connecting needle tube (10) and opens forward.

5. The pipetting connector according to claim 4, characterized in that: The front end of the outer sleeve (24) is axially symmetrically provided with two holding wings (241), and the two holding wings (241) open from the center toward the outside.

6. The pipetting connector according to claim 5, characterized in that: A protruding stripe (242) extending in the radial direction is arranged on the outward side of the holding wing (241).

7. The pipetting connector according to claim 1, characterized in that: The invention also comprises a sealing cover (50), wherein the rear end of the connecting needle seat (20) is provided with a side enclosure (25) extending backwards, and the sealing plug (30) is arranged in cooperation with the side enclosure (25); the sealing cover (50) is arranged outside the side enclosure (25), is fixedly connected to the connecting needle seat (20), and abuts against the rear end of the sealing plug (30); a through hole (51) is arranged in the middle of the sealing cover (50) so that the sealing plug (30) is exposed through the through hole (51).

8. The pipetting connector according to claim 7, characterized in that: The rear end of the connecting needle seat (20) is provided with an annular boss (23), and the rear end of the sealing plug (30) is provided with an annular groove (31), and the annular boss (23) and the annular groove (31) cooperate with each other so that the sealing plug (30) blocks the opening of the cavity structure (21).

9. A drug dispensing pipetting system, comprising the pipetting connector according to any one of claims 1 to 8, characterized in that: Also included is a liquid medicine transfer device, which includes a double-chamber syringe (60), a dispensing needle assembly (70) and a needle sealing assembly (80); The double-chamber syringe (60) is composed of a first syringe (61), a first piston rod (62) that can slide forward and backward along the inner cavity of the first syringe (61), a second syringe (63), and a second piston rod (64) that can slide forward and backward along the inner cavity of the second syringe (63), and the first syringe (61) and the second syringe (63) are arranged side by side and in the same direction; The dispensing needle assembly (70) comprises an injection needle seat (71), a first needle tube (72) and a second needle tube (73), wherein the first needle tube (72) and the second needle tube (73) are fixedly arranged at the front end of the injection needle seat (71) in a manner extending in the front-to-back direction, and the injection needle seat (71) is used to connect the first needle tube (72) to the first injection cylinder (61), and to connect the second needle tube (73) to the second injection cylinder (63); The needle sealing assembly (80) comprises a sliding sleeve (81) and a sealing member (82), wherein the rear end of the sliding sleeve (81) is axially slidably disposed on the outer side wall of the injection needle seat (71), and the sealing member (82) is fixedly disposed on the front end of the sliding sleeve (81); the needle sealing assembly (80) is mounted on the dispensing needle assembly (70), so that when the sliding sleeve (81) slides to the front relative to the injection needle seat (71), the sealing member (82) tightly wraps the front end openings of the first needle tube (72) and the second needle tube (73), and when the sliding sleeve (81) slides to the rear relative to the injection needle seat (71), the front end openings of the first needle tube (72) and the second needle tube (73) pass out of the sealing member (82); The liquid transfer connector is detachably connected to the sliding sleeve (81) of the needle sealing component (80), and when connected, the first needle tube (72) and the second needle tube (73) face the sealing plug (30) of the liquid transfer connector.

10. The drug dispensing and liquid transfer system according to claim 9, characterized in that: The pipetting connector is provided with a slope (52) along the circumferential direction on one side of the first opening; a hook (83) is provided on the outer edge of the front end of the sliding sleeve (81); the slope (52) and the hook (83) cooperate with each other so that when the hook (83) slides from a thinner part of the slope (52) to a thicker part, the pipetting connector is detachably connected to the needle sealing component (80); and a limiting block (53) is provided at the thicker part of the slope (52).

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