CN109432541B

CN109432541B - Infusion connector

Info

Publication number: CN109432541B
Application number: CN201811368706.8A
Authority: CN
Inventors: 梁洪岐; 栗亚
Original assignee: Amsino Healthcare Shanghai Co ltd
Current assignee: Amsino Healthcare Shanghai Co ltd
Priority date: 2018-11-16
Filing date: 2018-11-16
Publication date: 2024-04-19
Anticipated expiration: 2038-11-16
Also published as: CN109432541A

Abstract

The embodiment of the invention provides an infusion connector, which comprises: connector end, base, elastomeric element, swing joint spare and switch module: the joint end is arranged on the base and is provided with a liquid inlet; the base and the joint end form a valve cavity, and the base is provided with a liquid outlet; the elastic component is arranged in the valve cavity and divides the valve cavity into a solution cavity which can store liquid and has variable volume and an isolation cavity which is always isolated from the liquid; the movable connecting piece is arranged in the solution cavity and can move between a first position and a second position; the switch component is matched and connected with the movable connecting piece and used for closing or opening the liquid inlet. When the liquid supply plug is connected, the volume of the solution cavity is increased, and when the liquid supply plug is taken out, the volume of the solution cavity is reduced; wherein the change in volume of the solution chamber causes a flow of residual liquid within the infusion connector and creates a positive or zero pressure at the liquid outlet.

Description

Infusion connector

Technical Field

The invention relates to an infusion connector, in particular to an infusion connector which is clinically matched with an infusion catheter and an injector and can prevent liquid medicine from flowing back and blood from flowing back.

Background

Currently, when infusion or injection needs to be repeatedly performed for a long time in the intravenous infusion treatment process, an intravenous needle or an indwelling catheter is often selected. These intravenous catheters or indwelling catheters are typically connected to a three-way catheter, which is typically fitted with a standard Luer (Luer) fitting or heparin cap to meet the clinical requirements of various infusions. However, the medical apparatus has certain defects in clinical use: the luer connector on the three-way pipe needs to be disinfected locally each time and needs to be punctured by an injection needle, so that the workload and the operation risk are increased for medical care work; when the heparin cap is used, medical staff is required to fill heparin or physiological saline into the heparin cap for sealing after filling the liquid medicine, so that thrombus is prevented from being formed by blood coagulation, and the clinical operation is also burdened. In addition, the use of heparin caps may also cause small amounts of air to enter the blood circulation system, risking. Meanwhile, after the transfusion is finished, the two types of instruments can not solve the serious potential safety hazard caused by the fact that human blood flows back into the indwelling hose and the needle tube is blocked by blood coagulation due to negative pressure generated when the injection needle or the needleless connector is withdrawn.

To prevent the above-mentioned medical accidents, one-way positive pressure valves have been designed and applied to clinical infusion procedures. The known one-way positive pressure valve mostly adopts a spring as an elastic element, and the valve body is sometimes damaged due to the fact that the acting force of the spring on the valve body is large. In addition, the spring made of metal is easy to generate elastic fatigue, cannot be thoroughly sterilized, and brings potential safety hazard to the infusion process. In other embodiments, a contoured structure may be provided, such as adding an airway to create positive pressure through the volume of the gas regulating element, or by providing two liquid lines. These profiled structures are complex to process, increasing the difficulty of manufacture and assembly.

Disclosure of Invention

The technical problem to be solved by the embodiment of the invention is to provide the infusion connector, which forms positive pressure or zero pressure for preventing liquid medicine from flowing back and even blood return at the liquid output end after infusion is completed.

In order to solve the above technical problems, an embodiment of the present invention provides an infusion connector, including: connector end, base, elastomeric element, swing joint spare and switch module:

the joint end is arranged on the base and is provided with a liquid inlet; the base and the joint end form a valve cavity, and the base is provided with a liquid outlet; the elastic component is arranged in the valve cavity and divides the valve cavity into a solution cavity which can store liquid and has variable volume and an isolation cavity which is always isolated from the liquid; the movable connecting piece is arranged in the solution cavity and can move between a first position and a second position; the switch component is matched and connected with the movable connecting piece and used for closing or opening the liquid inlet;

When the liquid supply plug is connected, the switch component is opened to enable the liquid inlet to be opened, the movable connecting piece moves to the second position, the volume of the solution cavity is increased, and meanwhile liquid flows from the liquid supply plug to the liquid outlet through the solution cavity; when the liquid supply plug is taken out, the movable connecting piece moves from the second position to the first position under the action of the elastic component, the switch component is closed, the liquid inlet is closed, and the volume of the solution cavity is reduced; wherein the change in volume of the solution chamber causes a flow of residual liquid within the infusion connector and creates a positive or zero pressure at the liquid outlet.

Wherein the movable connection member divides the solution chamber into a first variable space toward the liquid inlet and a second variable space toward the liquid outlet; when the liquid supply plug is connected, the switch component is opened to enable the liquid inlet to be opened, the movable connecting piece is in a second position, the first variable space volume is increased, and liquid enters the first variable space from the liquid supply plug and flows to the liquid outlet through the second variable space;

When the liquid supply plug is taken out, the movable connecting piece moves from the second position to the first position under the action of the elastic component, and the switch component seals the liquid inlet; wherein the volume of the first variable space becomes smaller and the volume of the second variable space becomes larger, and the residual liquid in the solution cavity flows in the direction from the liquid inlet to the liquid outlet, so that positive pressure or zero pressure is formed at the liquid outlet.

Further, the elastic component comprises an elastic inner cavity for accommodating the movable connecting piece and an elastic wall capable of changing the volume of the elastic inner cavity, and the change of the volume of the elastic inner cavity can change the volumes of the first variable space and the second variable space.

Further, the movable connecting piece comprises a base capable of pushing the elastic component to elastically deform and a column tube which is arranged on the base, can be matched with the liquid supply plug and forms a liquid passage between the liquid inlet and the liquid outlet.

Further, the elastic member further includes a supporting portion for supporting the base.

Further, at least one flow channel is provided between the first variable space and the second variable space.

Further, the flow channel is arranged on the base or the elastic wall.

Further, the liquid outlet includes a liquid outlet tube extending to the valve cavity.

Further, the switch component is a deformable sleeve sleeved on the movable connecting piece.

Further, the deformable sleeve is sleeved on the tubular column; when the liquid supply plug is not connected, the deformable sleeve seals the column tube in the deformable sleeve, the deformable sleeve is at a third position, and the movable connecting piece is at the first position; when the liquid supply plug is connected, the column tube is pushed out of the deformable sleeve and is matched with the liquid supply plug, the deformable sleeve is at a fourth position, and the movable connecting piece is at the second position.

Further, the deformable sleeve is provided with a closable top end and a tube end which receives the post tube and engages the base.

Further, the top end is provided with a straight or cross-shaped elastic opening.

Further, the top end is provided with a first guiding cavity for guiding the column tube.

Further, the bottom of the tube end is provided with a seat end engaged with the seat.

Further, the joint end is provided with an accommodating cavity for accommodating the deformed deformable sleeve; when the liquid supply plug is inserted, the liquid supply plug pushes the deformable sleeve into the accommodating cavity, the deformable sleeve is positioned at the fourth position, the deformable sleeve is deformed, the column tube is pushed out of the deformable sleeve and is matched with the liquid supply plug, and the movable connecting piece is positioned at the second position.

Further, the receiving cavity is provided with a second guiding cavity for guiding the deformable sleeve from the fourth position to the third position.

Further, the deformable sleeve is made of an elastically flexible material.

Further, a first fixing portion capable of fixing the elastic component is arranged on the inner wall of the base.

Further, the elastic component is provided with a second fixing part which is matched and connected with the fixing part.

Further, the base is fixed to the supporting portion.

Further, the infusion connector also comprises at least one bypass pipeline.

According to the technical scheme, the infusion connector provided by the invention is characterized in that the elastic component with the variable volume is divided into the first variable space and the second variable space through the movable connecting piece, after the liquid supply plug is taken out, the volume of the first variable space is reduced, so that residual liquid in the infusion connector flows to the second variable space, positive pressure or zero pressure is formed at the liquid outlet end, and the positive pressure and the zero pressure depend on the volume change of the first variable space and the second variable space. Compared with the infusion connector capable of realizing unidirectional positive pressure in the prior art, the infusion connector provided by the embodiment of the invention has the advantages that the structure is simple, no metal material exists, the special air passage is not needed to be adopted to realize the change of the liquid volume in the infusion connector, meanwhile, the production and the assembly are easy, the size of the positive pressure can be accurately controlled, and the infusion connector has higher stability and safety on the premise of realizing the accuracy.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

Fig. 1 is an external view of an infusion connector according to an embodiment of the invention.

Fig. 2 is a schematic illustration of parts of an infusion connector according to an embodiment of the invention.

Fig. 3 is a schematic structural view of a valve chamber according to an embodiment of the present invention.

Fig. 4 is a sectional view showing the mounting structure of the elastic member in the embodiment of the present invention.

FIG. 5 is a cross-sectional view of an articulating component mounting structure in accordance with an embodiment of the invention.

Fig. 6 is an axial cross-sectional view of an infusion connector according to an embodiment of the invention when the infusion connector is not connected to a fluid supply plug.

Fig. 7 is a cross-sectional view of a part of an infusion connector according to an embodiment of the invention.

Fig. 8 is an axial cross-sectional view of an infusion connector according to an embodiment of the invention after being connected to a fluid supply plug.

Fig. 9 is a schematic view of an infusion connector according to another embodiment of the disclosure.

Fig. 10 is a schematic view of parts of another infusion connector according to an embodiment of the disclosure.

Fig. 11 is a schematic structural view of another deformable sleeve of an infusion connector according to an embodiment of the invention.

Fig. 12 is an external view schematically showing an infusion device using an infusion connector according to an embodiment of the present invention.

Fig. 13 is a schematic structural view of another embodiment of an infusion connector provided by the present invention.

Detailed Description

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. The terms of directions used in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., refer only to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not limiting of the invention.

The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.

As shown in fig. 1 to 8, fig. 1 is an external schematic view of an infusion connector provided by an embodiment of the present invention, and fig. 2 is a schematic part view of an infusion connector provided by an embodiment of the present invention. The infusion connector of the embodiment is clinically matched with an infusion catheter and an injector.

As shown in fig. 1 to 8, in the present embodiment, the infusion connector 100 includes: the connector 110, the base 150, the elastic member 140, the movable connector 130 and the switch assembly 120.

The connector 110 is mounted on the base 150, and the connector 110 is provided with a liquid inlet 111; the base 150 and the connector end 110 form a valve chamber 160, and the base 150 is provided with a liquid outlet 153; the elastic member 140 is disposed in the valve chamber 160, and divides the valve chamber 160 into a solution chamber 161 capable of storing liquid and an isolation chamber 162 isolated from the liquid all the time; the movable connecting piece 130 is arranged in the solution cavity 161 and can move between a first position and a second position; the switch assembly 120 is coupled with the movable connector 130 for closing or opening the liquid inlet;

The movable connecting piece 120 is used for moving the movable connecting piece 130 from the first position to the second position to elastically deform the elastic component 140 after the liquid supply plug 210 is connected to the liquid inlet 111, and meanwhile, a fluid passage is formed between the movable connecting piece 130 and the liquid supply plug 210; the switch assembly 120 is used for closing the liquid inlet 111 when the liquid supply plug 210 is not connected and opening the liquid inlet 111 when the liquid supply plug 210 is connected;

Specifically, when the liquid supply plug 210 is connected, the switch assembly is opened to open the liquid inlet 111, the movable connecting member 130 is in the second position, the volume of the solution chamber 161 is increased, and the liquid flows from the liquid supply plug 210 to the liquid outlet 153 through the solution chamber 161; when the liquid supply plug 210 is taken out, the movable connecting piece 130 moves from the second position to the first position under the action of the elastic component 140, the switch component 120 closes the liquid inlet 111, and the volume of the solution cavity 161 is reduced; wherein the change in volume of the solution chamber 161 causes the residual liquid within the infusion set 100 to flow and create a positive or zero pressure at the liquid outlet 153. Specifically, the residual liquid or a portion of the residual liquid within the infusion set 100 flows in a direction toward the liquid outlet 153.

More specifically, referring to fig. 2 and 3, the joint end 110 is mounted to the base 150, and the joint end 110 may be provided with a liquid inlet 111; the base 150 and the connector end 110 form a valve cavity 160, as shown in fig. 3, and fig. 3 is a schematic view of the valve cavity 160 according to an embodiment of the present invention. Specifically, the housing of the base 150 and the connector end 110 define a valve cavity 160 within the infusion connector 100. The connector end 110 and the base 150 may be as shown in fig. 2 and 3, the shape of the base 150 is larger than that of the connector end 110, that is, the connector end 110 has a smaller volume, the base 150 has a larger volume, and the connector end 110 is embedded in the base 150 and forms a liquid-tight connection. In other embodiments, the connector end 110 may have a shape that is larger than or equal to the size of the base 150, and may be connected in a liquid-tight manner, such as by gluing, die-casting, or ultrasonic welding. The base 150 is provided with a liquid outlet 153.

Referring to fig. 4-6, fig. 4 is a sectional view of an installation structure of an elastic component in an embodiment of the present invention, fig. 5 is a sectional view of an installation structure of a movable connector in an embodiment of the present invention, and fig. 6 is an axial sectional view of an infusion connector provided in an embodiment of the present invention. As shown in fig. 3-4, the elastic member 140 is disposed in the valve chamber 160, the elastic member 140 divides the valve chamber 160 into a solution chamber 161 capable of storing liquid and a separation chamber 162 isolated from the liquid, and when the elastic member 140 is elastically deformed, the volume of the solution chamber 161 is changed.

As shown in fig. 5, the movable coupling member 130 is installed in the solution chamber 161, and referring to fig. 6, the movable coupling member 130 partitions the solution chamber into a first variable space 163 toward the liquid inlet 111 and a second variable space 164 toward the liquid outlet 153 and communicably connecting the liquid inlet 111 and the liquid outlet 153, and the volumes of the first variable space 163 and the second variable space 164 may vary with the elastic deformation of the elastic member 140. The movable connector 130 is movable between a first position and a second position. In this embodiment, the switch assembly 120 is a deformable sleeve sleeved on the movable connecting member 130, and for convenience of description, the switch assembly 120 is replaced by the deformable sleeve 120 in the following part of the specification, and the deformable sleeve 120 is sleeved on the movable connecting member 130. Preferably, the deformable sleeve 120 is made of an elastic material, specifically, silica gel, plastic, rubber or other common materials, and in an embodiment of the present invention, the elastic coefficient of the deformable sleeve 120 is greater than the elastic coefficient of the elastic member 140 for structural stability and controllability. In other embodiments, the switch assembly may be, in addition to the deformable sleeve 120, another structure that opens the liquid inlet when the liquid feeding plug is inserted and closes the liquid inlet when the liquid feeding plug is pulled out, which will not be described in detail herein.

Referring to fig. 8, fig. 8 is a cross-sectional view of an infusion connector according to an embodiment of the invention after being connected to a fluid supply plug. When the fluid supply plug 210 is accessed, the deformable sleeve 120 forms an opening and the moveable connector 130 is in the second position. Namely, the liquid supply plug 210 pushes the deformable sleeve 120, when the deformable sleeve 120 reaches a preset position, deformation occurs and an opening is formed, at this time, the movable connecting piece 130 is in butt joint with the liquid supply plug 210, the volume of the first variable space 163 is increased, a liquid passage is formed between the liquid inlet 111 and the liquid outlet 153, and liquid can enter the first variable space 163; referring to fig. 5, when the liquid supply plug 210 is removed, the movable connector 130 moves from the second position to the first position shown in fig. 5 under the action of the elastic member 140, and the deformable sleeve 120 closes the liquid inlet 111; wherein the change in volume of the first variable space 163 causes the residual liquid within the infusion set 100 to flow in the direction of the liquid outlet 153 and create a positive or zero pressure at the liquid outlet. Specifically, when the movable coupling 130 returns to the first position, the volume of the first variable space 163 becomes smaller, and the volume of the second variable space 164 becomes larger, so that the residual liquid in the solution chamber 161 moves toward the liquid outlet 153. In this process, when the volume of the first variable space 163 is reduced more than the volume of the second variable space 164 is increased, the excessive liquid is introduced into the human body through the infusion tube 400 and the needle 500 shown in fig. 12, so that a positive pressure is formed at the liquid outlet 153. When the volume of the first variable space 163 is reduced to be equal to that of the second variable space 164, no excessive liquid flow to the human body is generated, so that zero pressure is formed at the liquid outlet 153, and no liquid backflow is generated.

Further, referring to fig. 6-8, the connector end 110 specifically includes luer threads 112, a fluid inlet 111, a receiving cavity 113 for receiving the deformed deformable sleeve 120, and further, the receiving cavity 113 is provided with a second guiding cavity 114 for guiding the deformable sleeve 120 from the fourth position to the third position. Further, the accommodating cavity 113 further includes a first engaging portion 115.

The deformable sleeve 120 is provided with a closable tip 122 and a tube end 121, the tip 122 being provided with a straight or cross-shaped elastic opening 123, which may be of other shapes. The tip 122 is also provided with a first guide cavity 125. In addition, the tip 122 is provided with a sealing protrusion 127, the sealing protrusion 127 being adapted to form a sealing connection between the outer surface of the tip 122 and the inner surface of the liquid inlet 111 when the deformable sleeve 120 is in the third position.

The movable connecting member 130 includes a base 131 capable of pushing the elastic member 140 to elastically deform, and a column tube 132 disposed on the base 131 and capable of being coupled with the liquid supply plug to form a liquid passage between the liquid inlet 111 and the liquid outlet 153, i.e. the movable connecting member 130 has a pipeline in an axial direction for allowing liquid to flow from the liquid inlet 111 to the liquid outlet 153. The base 131 is further provided with openings 134, and the openings 134 are fluid passages, so that fluid communication between the first variable space 163 and the second variable space 164 can be realized, and specifically, the number of the openings 134 is four, or can be other numbers. An upper portion of the base 131 may form an upwardly concave region 136, a lower portion of the base 131 may form a downwardly concave region 135, and the opening 134 may pass at least partially through the upwardly concave region 136 and the downwardly concave region 135, while another portion of the opening 134 may pass through the base sidewall 137 of the base 131. The fluid passage between the first variable space 163 and the second variable space 164 may be at least one fluid circulation groove provided on the elastic wall through which the fluid can flow between the first variable space 163 and the second variable space 164, in addition to the opening 134.

The elastic member 140 includes an elastic cavity 141 for accommodating the movable coupling 130 and an elastic wall 142 for varying the volume of the elastic cavity 141. The elastic component 140 further includes a supporting portion 144 for supporting the base 131, and the supporting portion 144 is used as a boundary to divide the elastic inner cavity 141 into a first elastic cavity 1411 capable of accommodating the movable connector 120 and a second elastic cavity 1412 coupled with the liquid outlet 111, wherein the first elastic cavity 1411 is defined by a first elastic side wall 1421 and an inner surface of the supporting portion 144, and the second elastic cavity 1412 is defined by an inner surface of a second elastic side wall 1422. Preferably, the first and second resilient cavities 1411, 1412 are each cylindrical. The elastic member 140 further includes a compression seal tube 146, a second fixing portion 143, and a second coupling portion 148.

The base 150 includes a housing 151, a third coupling portion 153, a liquid outlet 153, and a first fixing portion 154.

The assembly and function of the various components of the infusion set 100 are shown in figures 6 and 8. Referring to fig. 12, luer threads 112 of the connector end 110 may be connected with a corresponding cap 300 or a corresponding fluid supply plug 210. The liquid inlet 111 is connected to the liquid supply plug 210.

After the liquid supply plug 210 is inserted, the deformable sleeve 120 is pushed into the accommodating cavity 113, meanwhile, the deformable sleeve 120 pushes the movable connecting piece 130, the base 131 of the movable connecting piece 130 pushes the elastic component 140, the first elastic side wall 1421 is elongated to generate elastic deformation, and the volume of the first elastic cavity 1411 is increased, and since the first variable space 163 is mainly defined by the space of the joint end 110, the first elastic cavity 1411 and the movable connecting piece 130, the volume of the first elastic cavity 1411 is increased, so that the volume of the first variable space 163 is increased. At this time, the second elastic sidewall 1422 is compressed, so that the volume of the second elastic cavity 1412 is reduced, and since the second variable space 164 is mainly defined by the space of the liquid outlet 153, the second elastic cavity 1411 and the movable connector 130, the volume of the second elastic cavity 1412 is reduced, so that the volume of the second variable space 164 is reduced.

The deformable sleeve 120 may be made of a flexible material capable of being elastically deformed, when the deformable sleeve 120 is pushed into the accommodating cavity 113, the top end 122 of the deformable sleeve receives the pushing force of the liquid supply plug 210 and the elastic force of the elastic component 140, and the deformable sleeve 120 is not fixed by the side wall of the liquid inlet 111 when being in the accommodating cavity 113, and can be elastically deformed, at this time, the elastic opening 123 of the top end 122 is pushed open by the pillar tube 132 which also receives the elastic force of the elastic component 140, and the first guiding cavity 125 provided by the top end 122 can make the pillar tube 132 more easily push open the elastic opening 123. The column tube 132 is inserted into the liquid supply plug 210, and the tube column 132 is communicated with the tube of the liquid supply plug 210. Under the pressure of the liquid supply plug 210, the receiving compartment 113 can limit the rebound of the deformable sleeve 120 towards the liquid inlet 111 while the elastic member 140 is still in an elastically deformed state. In addition, the bottom of the tube end 121 of the deformable sleeve 120 is of a contracted configuration so as not to interfere with the flow through the aperture 134. Referring to fig. 10 and 11, fig. 10 is a part view of an infusion set according to another embodiment of the invention, and fig. 11 is a schematic structural view of a deformable sleeve according to another embodiment of the invention, in which the deformable sleeve 120 has a blocking piece 125, and the blocking piece 125 has a larger area to better stress the base 131 of the movable connecting piece 130, so that the elastic member 140 has a more uniform stress. The baffle plate is provided with a liquid circulation window 126, so that liquid can smoothly enter the first variable space 163 after passing through the opening 134.

The first engaging portion 115 of the joint end 110 is engaged with the second engaging portion 148 of the elastic member 140 and the third engaging portion 152 of the base 150, respectively, to form a fixed and liquid-tight seal, and may be specifically engaged by press-fit and/or ultrasonic welding.

The first fixing portion 143 of the elastic member 140 is a locking pin, the second fixing portion 154 of the base 150 is a locking groove capable of locking the overhead, or the first fixing portion 143 and the second fixing portion 154 are locking pin structures capable of locking each other. In other embodiments, different fastening means, such as welding, gluing, etc., may be used between the resilient member 140 and the base 150.

The liquid outlet 153 of the base 150 includes a liquid outlet 155 extending to the valve chamber 160, and the compression seal tube 146 of the elastic member 140 can be sleeved on the liquid outlet 155 to form a liquid seal of the elastic member 140 to the liquid chamber 161, i.e. to achieve a liquid sealing effect between the elastic member 140 and the liquid outlet 153. The compression seal 146 is preferably a length of bellows to achieve a seal that does not interfere with the sealing effect when deformed.

Referring additionally to fig. 9, the infusion set may further include a bypass line 170, wherein an inlet end of the bypass line 170 is disposed at the liquid outlet 153, and liquid in the bypass line 170 does not enter the solution chamber 161 during infusion.

The principle of the infusion connector 100 after use to achieve positive pressure at the liquid outlet 153 is:

when the liquid supply plug 210 is inserted, the deformable sleeve 120 is pushed into the accommodating cavity 113, i.e. the deformable sleeve 120 moves from the third position to the fourth position. The deformable sleeve 120 pushes the base 131 such that the base 131 pushes the support 144 to elastically deform the elastic wall 142, increasing the volume of the solution chamber 163 and decreasing the volume of the isolation chamber 164. At this time, the volume of the first variable space 163 increases, and the volume of the second variable space 164 decreases. Meanwhile, the deformable sleeve 120 deforms in the accommodating cavity 113 under the pressure of the liquid supply plug 210 and is temporarily at the fourth position, and at the moment, the column tube 132 is abutted against the liquid supply plug 210 from the deformable sleeve 120 under the elasticity of the elastic component 140, at the moment, the liquid in the liquid supply plug 210 can flow between the liquid inlet 111 and the liquid outlet 153, that is, the liquid can enter the second variable space 164 through the column tube 132 and flow to the liquid outlet 153 through the second variable space 164 to finally enter the human body; at the same time, the liquid enters the first variable space 163 through the opening 134 of the base 131, and fills the first variable space 163.

When the liquid supply plug 210 is pulled out, the pressure applied to the elastic component 140 indirectly disappears, the elastic component 140 moves the movable connecting piece 130 contacted with the elastic component in the returning process towards the direction of the liquid inlet 111, the base 131 of the movable connecting piece 130 pushes the deformable sleeve 120 contacted with the elastic component, the pipe column 132 drives the deformable sleeve 120 to move towards the direction of the liquid inlet 111, the deformable sleeve 120 enters the liquid inlet 111 under the guidance of the second guiding cavity 114 until reaching a third position, when the deformable sleeve 120 moves towards the direction of the liquid inlet 111, the inner wall of the liquid inlet presses the deformable sleeve to enable the pipe column 132 to move towards the direction of the liquid outlet 153, and when the pipe column 132 is retracted into the top end 122, the first guiding cavity 125 enables the pipe column 120 to move further towards the direction of the liquid outlet 153 until the elastic opening 123 is closed to form a seal. In this process, the volume of the first variable space 163 is reduced, and the volume of the second variable space 164 is increased. Assuming that the volume of the first variable space 163 when the liquid feeding plug 210 is pulled out is reduced by X with respect to the volume of the first variable space 163 when the liquid feeding plug 210 is inserted, and the volume of the second variable space 164 when the liquid feeding plug 210 is pulled out is increased by Y with respect to the volume of the second variable space 163 when the liquid feeding plug 210 is inserted, the liquid having the volume X moves through the opening 134 of the base 131 in the direction of the liquid outlet 153. In this process, when X is greater than Y, i.e., the volume of the first variable space 163 is reduced more than the volume of the second variable space 164, the excessive liquid is introduced into the human body through the infusion tube 400 and the needle 500 shown in fig. 12, so that a positive pressure is formed at the liquid outlet 153. When X is equal to Y, the reduced volume of the first variable space 163 is equal to the increased volume of the second variable space 164, no excessive liquid flow to the human body is generated, so that zero pressure is formed at the liquid outlet 153, and no liquid backflow is generated.

Referring to fig. 5-8, fig. 5-8 illustrate a shape and size of the base 131 of the movable connector 130, in which the shape and size of the base 131 of the movable connector 130 can be set according to the amount of forming pressure required between the liquid outlets 153 in actual use, and the form of cooperation of the base 131 and the support 144 can affect the deformation form of the elastic member 140 to affect the volume change of the first variable space 163 and the second variable space 164 between different states, so that different final infusion connectors can be produced, and the amount of pressure at the liquid outlets 153 after the liquid supply plug 210 is pulled out can also be set according to requirements.

Referring specifically to fig. 13, fig. 13 is a schematic structural diagram of another embodiment of an infusion connector provided by the present invention, as shown in fig. 13, a contact area of a base 131 of a movable connector 130 in a first elastic cavity 1411 is smaller, at this time, when the movable connector 130 moves to a second position, the base 131 can control a volume increment of the first elastic cavity 1411 to be within a smaller range, and the second elastic cavity 1411 is a cavity with an axial section taking a pillar 132 as an axis as a polygon, and when the movable connector 130 moves to the second position, the base 131 can control a volume decrement of the second elastic cavity 1411 to be within a larger range, so that the volume increment of the first variable space 163 is equal to the volume decrement of the second variable space 164, so as to form a zero pressure at the liquid outlet 15.

The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. An infusion connector, comprising: connector end, base, elastomeric element, swing joint spare and switch module:

The joint end is arranged on the base and is provided with a liquid inlet; the base and the joint end form a valve cavity, and the base is provided with a liquid outlet; the elastic component is arranged in the valve cavity and divides the valve cavity into a solution cavity which can store liquid and has a variable volume and an isolation cavity isolated from the liquid; the movable connecting piece is arranged in the solution cavity and can move between a first position and a second position; the switch component is matched and connected with the movable connecting piece and is used for closing or opening the liquid inlet;

When the liquid supply plug is connected, the switch assembly is opened to enable the liquid inlet to be opened, the movable connecting piece moves to the second position, the volume of the solution cavity is increased, and meanwhile liquid flows from the liquid supply plug to the liquid outlet through the solution cavity; when the liquid supply plug is taken out, the movable connecting piece moves from the second position to the first position under the action of the elastic component, the switch component is closed, the liquid inlet is closed, and the volume of the solution cavity is reduced; wherein the volume change of the solution cavity causes the residual liquid in the infusion connector to flow and form positive pressure or zero pressure at the liquid outlet;

the movable connecting piece divides the solution cavity into a first variable space facing the liquid inlet and a second variable space facing the liquid outlet; when the liquid supply plug is connected, the switch component is opened to enable the liquid inlet to be opened, the movable connecting piece is in a second position, the first variable space volume is increased, and liquid enters the first variable space from the liquid supply plug and flows to the liquid outlet through the second variable space;

When the liquid supply plug is taken out, the movable connecting piece moves from the second position to the first position under the action of the elastic component, and the switch component seals the liquid inlet; wherein the volume of the first variable space becomes smaller, the volume of the second variable space becomes larger, and the residual liquid in the solution cavity flows in the direction from the liquid inlet to the liquid outlet, so that positive pressure or zero pressure is formed at the liquid outlet;

the movable connecting piece comprises a base capable of pushing the elastic component to elastically deform and a column tube which is arranged on the base, can be matched with the liquid supply plug and forms a liquid passage between the liquid inlet and the liquid outlet.

2. The infusion set according to claim 1, wherein the elastic member comprises an elastic lumen for receiving the articulating member and an elastic wall for varying the volume of the elastic lumen, the variation in volume of the elastic lumen varying the volumes of the first variable volume and the second variable volume.

3. The infusion connector of claim 2, wherein the resilient member further comprises a support portion for supporting the base.

4. The infusion connector of claim 2, wherein at least one flow channel is provided between the first variable space and the second variable space.

5. The infusion set of claim 4, wherein the flow channel is disposed on the base or on the flexible wall.

6. The infusion connector of claim 1, wherein said fluid outlet includes a fluid outlet tube extending into said valve chamber.

7. The infusion connector of claim 2, wherein the switch assembly is a deformable sleeve that fits over the articulating member.

8. The infusion connector of claim 7, wherein the deformable sleeve is sleeved over the tubing string; when the liquid supply plug is not connected, the deformable sleeve seals the column tube in the deformable sleeve, the deformable sleeve is at a third position, and the movable connecting piece is at the first position; when the liquid supply plug is connected, the column tube is pushed out of the deformable sleeve and is matched with the liquid supply plug, the deformable sleeve is at a fourth position, and the movable connecting piece is at the second position.

9. The infusion set according to claim 8, wherein said deformable sleeve is provided with a closable tip and a tube end for receiving said post and engaging said base.

10. The infusion set according to claim 9, wherein said tip is provided with a straight or cross-shaped elastic opening.

11. The infusion set according to claim 9, wherein the tip is provided with a first guide lumen for guiding the vial.

12. The infusion connector of claim 8, wherein said connector end defines a receiving cavity for receiving said deformed deformable sleeve; when the liquid supply plug is inserted, the liquid supply plug pushes the deformable sleeve into the accommodating cavity, the deformable sleeve is positioned at the fourth position, the deformable sleeve is deformed, the column tube is pushed out of the deformable sleeve and is matched with the liquid supply plug, and the movable connecting piece is positioned at the second position.

13. The infusion connector according to claim 12, wherein the receiving cavity is provided with a second guiding cavity for guiding the deformable sleeve from the fourth position to the third position.

14. The infusion connector of claim 7, wherein the deformable sleeve is made of a resiliently flexible material.

15. The infusion set according to claim 1, wherein the inner wall of the base is provided with a first fixing portion to which the elastic member is fixable.

16. The infusion set according to claim 15, wherein the elastic member is provided with a second fixing portion to which the fixing portion is fitted.

17. The infusion connector of claim 3, wherein the base is secured to the support.

18. The infusion connector of any of claims 1-17, further comprising at least one bypass line.