Needle-free infusion valve body and needle-free infusion connector

Abstract

A needleless infusion valve body and a needleless infusion connector, wherein the needleless infusion valve body is used to connect a vascular indwelling device and an infusion device, wherein the needleless infusion valve body has a rectilinearly extending cavity, and the needleless infusion valve body includes a liquid inlet end and a liquid outlet end, wherein the inner diameter of the cavity gradually increases in the rectilinear extension direction of the cavity from the liquid inlet end toward the liquid outlet end, and the liquid inlet end is provided with a liquid inlet connected to the cavity, and the liquid inlet is used to communicate with the infusion device, and the liquid inlet is located on the outer peripheral surface of the liquid inlet end, and the liquid outlet end is provided with a liquid outlet connected to the cavity, and the liquid outlet is used to communicate with the vascular indwelling device. By setting a rectilinearly extending cavity, the inner diameter of the cavity gradually increases in the rectilinear extension direction of the cavity from the liquid inlet end toward the liquid outlet end, so as to form a draft angle that is conducive to demoulding, and at the same time, the liquid inlet is set on the outer peripheral surface of the liquid inlet end, so that the needleless infusion valve body is not easy to produce defects such as burrs in the demoulding stage when a reasonable mold separation method is adopted.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and in particular relates to a needle-free infusion valve body and a needle-free infusion connector having the needle-free infusion valve body. Background Art

[0002] Intravenous infusion therapy refers to the injection of fluids, drugs, nutritional support and blood transfusion therapy through the intravenous route. It is a highly technical and professional treatment method. At present, the common infusion connectors on the market are divided into two types: puncture type (also known as needle connection, usually heparin cap) and non-puncture type (also known as needle-free infusion connector connection). The above-mentioned infusion connectors are generally used in conjunction with long-term vascular indwelling parts such as venous indwelling needles (Vein Detained Needle) and central venous catheters (Peripherally Inserted Central Venous Catheters, PICC), through which liquid medicine can be infused into the blood vessels and blood or liquid can be extracted. There are two major hidden dangers in the interface of the puncture connector. On the one hand, the needle punctures the rubber plug multiple times, which poses a risk of debris entering the infusion system for patients. On the other hand, there is a risk of accidental hand pricking by the puncture needle for medical staff. For the above problems, the use of needle-free connection can greatly reduce the risk of their occurrence. Due to the above reasons, needle-free infusion came into being. Needle-free infusion system refers to a type of device designed to repeatedly deliver or extract liquids to the infusion line without acupuncture. This system can achieve unidirectional or bidirectional flow of liquids. The bidirectional flow of liquids allows users to add drugs or withdraw liquids, which can avoid the above risks. At the same time, needle-free infusion has the following advantages: ① Simple operation, which can greatly reduce the workload of nurses, ② Reduce the blockage of indwelling needles, ③ Reduce the occurrence of local phlebitis reactions, ④ Reduce the use of consumables such as cannula needles, films, scalp needles, heparin caps, empty needles, etc., reducing the burden on patients, ⑤ Reduce the occurrence of infusion line detachment, etc.

[0003] The needle-free infusion valve body is an important part of the needle-free infusion connector. It is mainly responsible for providing an infusion path to facilitate infusion or extraction. Currently, the needle-free infusion valve body on the market is mainly produced by injection molding. Due to the unreasonable structural design of the needle-free infusion valve body, burrs and other defects are easily generated during the injection molding process, especially in the demoulding stage. Summary of the invention

[0004] The object of the present invention is to provide a needle-free infusion valve body, which has a reasonable structural design and is not prone to defects such as burrs during the demoulding stage.

[0005] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention provides a needle-free infusion valve body, which is used to connect a vascular retention device and an infusion device, and the needle-free infusion valve body has a rectilinearly extending cavity, and the needle-free infusion valve body includes a liquid inlet end and a liquid outlet end. In the rectilinear extension direction of the cavity from the liquid inlet end toward the liquid outlet end, the inner diameter of the cavity gradually increases, and the liquid inlet end is provided with a liquid inlet connected to the cavity, and the liquid inlet is used to communicate with the infusion device, and the liquid inlet is located on the outer peripheral surface of the liquid inlet end, and the liquid outlet end is provided with a liquid outlet connected to the cavity, and the liquid outlet is used to communicate with the vascular retention device.

[0007] In one embodiment, the needle-free infusion valve body is provided with a first cutout and a second cutout, both of which are connected to the cavity, the first cutout is located on a side of the liquid inlet away from the liquid outlet, and the second cutout is located on a side of the liquid inlet close to the liquid outlet, and on a plane perpendicular to the straight extension direction of the cavity, the orthographic projection size of the first cutout is less than or equal to the orthographic projection size of the second cutout.

[0008] In one embodiment, the first cut is circular, the second cut is annular, the outer contour of the first cut is circular, the inner contour of the first cut is a closed geometric figure, the geometric figure has an arc edge close to the liquid inlet, and the radius of the first cut is smaller than the radius corresponding to the arc edge.

[0009] In one embodiment, the liquid inlet end includes a connecting portion and a bottom, the liquid inlet is arranged on the outer peripheral surface of the connecting portion, the bottom is connected to one end of the connecting portion close to the liquid outlet, and the outer diameter of the bottom gradually increases in the straight extension direction of the cavity from the liquid inlet end toward the liquid outlet end.

[0010] In one embodiment, the liquid inlet end further includes a top connected to an end of the connecting portion facing away from the bottom, and an outer diameter of the top gradually increases in a straight extension direction of the cavity from the liquid inlet end toward the liquid outlet end.

[0011] In one embodiment, the outer peripheral surface of the top and the outer peripheral surface of the bottom are both conical surfaces, and the taper of the top is less than or equal to the taper of the bottom.

[0012] In one embodiment, the outer circumferential surface of the top portion and the outer circumferential surface of the connecting portion are connected in a smooth transition, and the outer circumferential surface of the connecting portion and the outer circumferential surface of the bottom portion are connected in a smooth transition.

[0013] In one embodiment, the inner wall of the connecting portion and the inner wall of the bottom are connected with a smooth transition.

[0014] In the second aspect, the present invention also provides a needle-free infusion connector, comprising a valve core, a shell and the needle-free infusion valve body described in any one of the embodiments of the first aspect, the shell having a accommodating space, the needle-free infusion valve body being located in the accommodating space and connected to the shell, the valve core being sleeved on the outer circumference of the liquid inlet end and covering the liquid inlet; when the infusion device extends into the accommodating space and is sleeved on the outer circumference of the liquid inlet end, the infusion device squeezes the valve core so that the valve core opens the liquid inlet, and the infusion device transports / extracts liquid to / from the liquid inlet; when the infusion device leaves the accommodating space from the outer circumference of the liquid inlet end, the valve core resumes its deformation to re-close the liquid inlet.

[0015] In one embodiment, the valve core includes an inner surface and an outer surface, the inner surface is connected to the outer peripheral surface of the liquid inlet end, and the outer surface is provided with a supporting structure, and the supporting structure abuts against the inner wall of the outer shell.

[0016] In one embodiment, both the inner surface and the outer surface of the valve core are corrugated.

[0017] By setting a rectilinearly extending cavity, the inner diameter of the cavity gradually increases in the rectilinear extending direction of the cavity from the liquid inlet end toward the liquid outlet end, so as to form a draft angle that is conducive to demolding. At the same time, the liquid inlet is set on the outer peripheral surface of the liquid inlet end, so that the needle-free infusion valve body is not prone to defects such as burrs during the demolding stage when a reasonable mold separation method is adopted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the needle-free infusion valve body in the front view of an embodiment of the present invention;

[0020] Figure 2 is a schematic cross-sectional view of the cavity of this embodiment;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the liquid inlet end of the needle-free infusion valve body;

[0022] Figure 4a for Figure 1 A schematic diagram of the structure of the needle-free infusion valve body viewed along the CC direction;

[0023] Figure 4b for Figure 4a A schematic diagram of a first section of

[0024] Figure 4c for Figure 4a A schematic diagram of a second section of

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the needle-free infusion valve body of an embodiment of the present invention when viewed from the left;

[0026] Figure 6 Schematic diagram of a partial cross-section of the needle-free infusion connector of this embodiment. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 The embodiment of the present invention provides a needle-free infusion valve body 100, which is used to connect a vascular indwelling device and an infusion device. The vascular indwelling device can be a venous indwelling needle, a central venous catheter, etc., and the infusion device can be a syringe, an infusion set, a blood transfusion set, etc. The needle-free infusion valve body 100 has a rectilinearly extending cavity 1001, and the needle-free infusion valve body 100 includes a liquid inlet end 10 and a liquid outlet end 20. In the rectilinear extension direction 91 of the cavity 1001 from the liquid inlet end 10 toward the liquid outlet end 20, the inner diameter of the cavity 1001 gradually increases. The liquid inlet end 10 is provided with a liquid inlet 110 communicating with the cavity 1001, and the liquid inlet 110 is used to communicate with the infusion device, and the liquid inlet 110 is located on the outer peripheral surface 101 of the liquid inlet end 10. The liquid outlet end 20 is provided with a liquid outlet 210 communicating with the cavity 1001, and the liquid outlet 210 is used to communicate with the vascular indwelling device.

[0029] Specifically, the needle-free infusion valve body 100 is preferably injection molded. The liquid outlet 20 is preferably a standard outer conical Luer lock connector. The inner diameter of the cavity 1001 is used here, which does not limit the shape of the cut-off of the cavity 1001 to only a circle. The cut-off shape of the cavity 1001 can also be an ellipse or other shapes, preferably as follows: Figure 2The shape shown. In the straight extension direction 91 of the cavity 1001 from the liquid inlet end 10 toward the liquid outlet end 20, the inner diameter of the cavity 1001 gradually increases. The change rule can be a uniform linear increase, or the inner diameter of a certain section of the cavity 1001 remains unchanged, and the inner diameter of a certain section of the cavity 1001 increases. It is preferably a uniform linear increase. The liquid inlet end 10 and the liquid outlet end 20 of this embodiment are not limited to the needle-free infusion valve body 100 that can only infuse from the liquid inlet end 10 toward the liquid outlet end 20. The needle-free infusion valve body 100 of this embodiment can realize bidirectional flow and can also draw liquid from the liquid outlet end 20 toward the liquid inlet end 10. It can be understood that the cavity 1001 set in this way forms a draft angle that is conducive to demoulding, which is conducive to better reducing the risk of defects such as burrs. At the same time, the liquid inlet 110 is set on the outer peripheral surface 101 of the liquid inlet end 10 to facilitate needle-free infusion.

[0030] By setting a rectilinearly extending cavity 1001, the inner diameter of the cavity 1001 gradually increases in the rectilinear extension direction 91 of the cavity 1001 from the liquid inlet end 10 toward the liquid outlet end 20, so as to form a draft angle that is conducive to demolding. At the same time, the liquid inlet 110 is set on the outer peripheral surface 101 of the liquid inlet end 10, so that the needle-free infusion valve body 100 is not prone to defects such as burrs during the demolding stage when a reasonable mold separation method is adopted, which is beneficial to improving the stability of infusion, thereby reducing medical risks and improving treatment effects.

[0031] In one implementation, see Figure 3 and Figure 4a, the needle-free infusion valve body 100 is provided with a first cutout 10011 and a second cutout 10012 both of which are connected to the cavity 1001. The first cutout 10011 is located on the side of the liquid inlet 110 away from the liquid outlet 210, and the second cutout 10012 is located on the side of the liquid inlet 110 close to the liquid outlet 210. On a plane perpendicular to the linear extension direction 91 of the cavity 1001, the orthographic projection size of the first cutout 10011 is less than or equal to the orthographic projection size of the second cutout 10012. Specifically, in this embodiment, the plane where the first cutout 10011 is located and the plane where the second cutout 10012 is located are parallel to each other and are both perpendicular to the linear extension direction 91. In other embodiments, the plane where the first cutout 10011 is located and the plane where the second cutout 10012 is located may also intersect. It is understandable that the demoulding direction of the needle-free infusion valve body 100 provided in this embodiment is the same as the linear extension direction 91. Therefore, under the premise that the orthographic projection size of the first cutout 10011 is smaller than the orthographic projection size of the second cutout 10012 on the plane perpendicular to the linear extension direction 91, the demoulding of the needle-free infusion valve body 100 does not require additional steps such as lateral core pulling, thereby greatly reducing the molding difficulty of the needle-free infusion valve body 100 and further reducing the risk of defects such as burrs. Moreover, the simple molding process can also simplify the mold structure and shorten the production cycle, which is conducive to reducing costs.

[0032] In one implementation, see Figure 4b and Figure 4c , the first cutout 10011 and the second cutout 10012 are arranged in parallel. The first cutout 10011 is circular, the second cutout 10012 is annular, the outer contour of the first cutout 10011 is circular, the inner contour of the first cutout 10011 is a closed geometric figure, the geometric figure has an arc edge 100121 close to the liquid inlet 110, and the radius r1 of the first cutout 10011 is smaller than the radius r2 corresponding to the arc edge 100121. Specifically, in other embodiments, the radius r1 of the first cutout 10011 can also be equal to the radius r2 corresponding to the arc edge 100121. By setting the radius r1 of the first cutout 10011 smaller than the radius r2 of the arc edge 100121 of the inner contour of the second cutout 10012, the cavity 1001 forms a draft angle that is conducive to demolding, which helps to reduce the difficulty of demolding. At the same time, since the first cutout 10011 and the second cutout 10012 are parallel, two symmetrical liquid inlets 110 are formed, which is beneficial to improving the stability of infusion.

[0033] In one implementation, see Figure 3, the liquid inlet end 10 includes a connecting portion 11 and a bottom portion 12, and the liquid inlet 110 is arranged on the outer peripheral surface 111 of the connecting portion 11. The bottom portion 12 is connected to one end of the connecting portion 11 close to the liquid outlet 210, and the outer diameter of the bottom portion 12 gradually increases in the straight extension direction 91 of the cavity 1001 from the liquid inlet end 10 to the liquid outlet end 20. Specifically, the number of the liquid inlet 110 is preferably two, and the two liquid inlets 110 are respectively located on opposite sides of the outer peripheral surface 111 of the connecting portion 11, so that the two liquid inlets 110 are opposite. It can be understood that since the outer diameter of the bottom portion 12 gradually increases in the straight extension direction 91 of the cavity 1001 from the liquid inlet end 10 to the liquid outlet end 20, it is convenient to form a draft angle that is conducive to demolding on the outer peripheral surface 121 of the bottom portion 12, further reducing the risk of defects such as burrs.

[0034] In one implementation, see Figure 3 The liquid inlet end 10 also includes a top 13, and the top 13 is connected to the end of the connecting portion 11 facing away from the bottom 12. In the straight extension direction 91 of the cavity 1001 from the liquid inlet end 10 toward the liquid outlet end 20, the outer diameter of the top 13 gradually increases. Specifically, the increase rule of the outer diameter of the top 13 and the outer diameter of the bottom 12 can refer to the increase rule of the inner diameter of the cavity 1001 mentioned above, which can be a uniform linear increase or an intermittent increase, preferably a uniform linear increase. Moreover, the cross-sectional shape of the top 13 and the bottom 12 is not limited to a circle, but can also be an ellipse or the like. Figure 2 The edge of the end surface of the top 13 has a rounded structure to facilitate the connection of the infusion device with the liquid inlet end 10. By being arranged in the straight extension direction 91 of the cavity 1001 from the liquid inlet end 10 toward the liquid outlet end 20, the outer diameter of the top 13 gradually increases, so that the outer peripheral surface 131 of the top 13 can form a draft angle that is conducive to demolding, thereby further reducing the risk of defects such as burrs.

[0035] In one implementation, see Figure 3 , the outer peripheral surface 131 of the top 13 and the outer peripheral surface 121 of the bottom 12 are both conical surfaces, and the taper of the top 13 is less than or equal to the taper of the bottom 12. Specifically, the cross-sections of the top 13 and the bottom 12 in this embodiment are both circular. The top 13 has a "quasi-flat key" shape, that is, the taper of the top 13 is small, close to 0. It can be understood that the outer peripheral surface 131 of the top 13 and the outer peripheral surface 121 of the bottom 12 are both conical surfaces, which is convenient for the manufacture of the mold on the one hand, and convenient for designing the draft angle on the other hand, which is conducive to demolding. Moreover, since the taper of the top 13 is less than or equal to the taper of the bottom 12, it is conducive to the demolding of the entire liquid inlet end 10.

[0036] In one implementation, see Figure 5, the outer peripheral surface 131 of the top 13 and the outer peripheral surface 111 of the connecting part 11 are connected with a smooth transition, and the outer peripheral surface 111 of the connecting part 11 and the outer peripheral surface 121 of the bottom 12 are connected with a smooth transition. Specifically, the outer peripheral surface 111 of the connecting part 11 and the outer peripheral surface 121 of the bottom 12 are both conical surfaces, and the taper is the same. The taper of the outer peripheral surface 131 of the top 13 is smaller than the taper of the outer peripheral surface 111 of the connecting part 11. The position where the outer peripheral surface 131 of the top 13 and the outer peripheral surface 111 of the connecting part 11 are connected can be achieved by setting a rounded structure, or making the angle formed by the two larger, etc., so as to achieve a smooth transition connection between the outer peripheral surface 111 of the connecting part 11 and the outer peripheral surface 131 of the top 13. It can be understood that the outer periphery of the needle-free infusion valve body 100 is generally sleeved with a valve core, and the valve core is used to move relative to the needle-free infusion valve body 100 to open or close the liquid inlet 110. The beneficial effect of this design is that it can avoid scratching when the valve core and the needle-free infusion valve body 100 move relative to each other, thereby ensuring good sealing performance.

[0037] In one implementation, see Figure 1 and Figure 5 , the inner wall 112 of the connecting part 11 and the inner wall 122 of the bottom 12 are connected in a smooth transition. Specifically, the position where the inner wall 112 of the connecting part 11 and the inner wall 122 of the bottom 12 are connected can be achieved by setting a rounded structure, or making the angle formed by the two larger, so as to achieve a smooth transition connection between the inner wall 112 of the connecting part 11 and the inner wall 122 of the bottom 12. Such a setting is conducive to forming a whole smooth and complete inner cavity structure, which is not only conducive to demoulding, but also can avoid the appearance of dead space, and the infusion speed is faster.

[0038] See also Figure 1 and Figure 6 The embodiment of the present invention further provides a needle-free infusion connector 1000, which is used to connect a vascular indwelling part and an infusion device. The vascular indwelling part can be a venous indwelling needle, a central venous catheter, etc., and the infusion device can be a syringe, an infusion set, a blood transfusion set, etc. The needle-free infusion connector 1000 includes a needle-free infusion valve body 100, a valve core 200, and a housing 300 provided by the present invention. The housing 300 has a receiving space 301, and the needle-free infusion valve body 100 is located in the receiving space 301 and connected to the housing 300. The valve core 200 is sleeved on the outer peripheral surface 101 of the liquid inlet end 10 and covers the liquid inlet 110.

[0039] Specifically, the outer periphery of the liquid outlet 20 of the needle-free infusion valve body 100 is provided with a clamping structure 21, and the inner wall 3001 of the shell 300 is provided with a clamping groove 30011, the shape of the clamping groove 30011 corresponds to the shape of the clamping structure 21, and the clamping structure 21 is clamped in the clamping groove 30011 so that the needle-free infusion valve body 100 and the shell 300 are relatively fixed. The material of the valve core 200 is preferably silicone. The shell 300 and the needle-free infusion valve body 100 can be selected from hard plastics such as acrylonitrile-butadiene-styrene copolymer (ABS), copolyester (Polyethylene Terephthalate, PETG), polycarbonate (Polycarbonate, PC), polyethylene terephthalate (Polyethylene terephthalate, PET), polystyrene (Polystyrene, PS), polyvinyl chloride (Polyvinyl chloride, PVC), etc., wherein the material of the shell 300 is preferably ABS or PETG, and the needle-free infusion valve body 100 is preferably PC.

[0040] When the infusion device extends into the accommodating space 301 and is sleeved on the outer periphery of the liquid inlet end 10, the infusion device squeezes the valve core 200 so that the valve core 200 opens the liquid inlet port 110, and the infusion device transports / extracts liquid to / from the liquid inlet port 110; when the infusion device leaves the accommodating space 301 from the outer periphery of the liquid inlet end 10, the valve core 200 restores its deformation to re-close the liquid inlet port 110.

[0041] By adding the needle-free infusion valve core 200 provided by the present invention to the needle-free infusion connector 1000, it is beneficial to improve the stability of infusion, thereby reducing medical risks and improving treatment effects. At the same time, the liquid inlet 110 is arranged on the outer peripheral surface 101 of the liquid inlet end 10 of the needle-free infusion valve body 100, so that the liquid inlet 110 can be closed or opened by the valve core 200.

[0042] In one implementation, see Figure 1 and Figure 6The valve core 200 includes an inner surface 2001 and an outer surface 2002. The inner surface 2001 is connected to the outer peripheral surface 101 of the liquid inlet end 10. The outer surface 2002 is provided with a support structure 20021. The support structure 20021 abuts against the inner wall 3001 of the housing 300. Specifically, the support structure 20021 is opposite to the connecting portion 11 and the top 13, so that the support structure 20021 can lift up the inner surface 2001 of the valve core 200, so that the valve core 200 blocks the liquid inlet 110 and has good sealing performance. The way in which the support structure 20021 abuts against the inner wall 3001 can refer to the above-mentioned clamping structure 21 and the clamping groove 30011. By providing the support structure 20021, the valve core 200 can better block the liquid inlet 110 and open the liquid inlet 110, and has good sealing performance, which is conducive to improving the accuracy and life of the needle-free infusion connector 1000.

[0043] In one implementation, see Figure 6 The inner surface 2001 and the outer surface 2002 of the valve core 200 are both corrugated. By providing the corrugated inner surface 2001 and the outer surface 2002, the valve core 200 can move relatively to the needle-free infusion valve body 100 to open or close the liquid inlet 110, which is conducive to improving the user experience.

[0044] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A needle-free infusion valve body, the needle-free infusion valve body is used to connect a vascular indwelling component and an infusion device, characterized in that: The needle-free infusion valve body is injection molded, and has a rectilinearly extending cavity. The needle-free infusion valve body includes a liquid inlet end and a liquid outlet end. In the rectilinear extension direction of the cavity from the liquid inlet end toward the liquid outlet end, the inner diameter of the cavity gradually increases. The liquid inlet end is provided with a liquid inlet communicating with the cavity, and the liquid inlet is used to communicate with the infusion device. The liquid inlet is located on the outer peripheral surface of the liquid inlet end. The liquid outlet end is provided with a liquid outlet communicating with the cavity, and the liquid outlet is used to communicate with the vascular retention component. The needle-free infusion valve body is provided with a first cutout and a second cutout both connected to the cavity, the first cutout is located on a side of the liquid inlet away from the liquid outlet, and the second cutout is located on a side of the liquid inlet close to the liquid outlet, and on a plane perpendicular to the straight extension direction of the cavity, the orthographic projection size of the first cutout is less than or equal to the orthographic projection size of the second cutout; The first cutout is circular, the second cutout is annular, the outer contour of the first cutout is circular, the inner contour of the first cutout is a closed geometric figure, the geometric figure has an arc edge close to the liquid inlet, and the radius of the first cutout is smaller than the radius corresponding to the arc edge.

2. The needle-free infusion valve body according to claim 1, characterized in that: The first cutout and the second cutout are arranged in parallel.

3. The needle-free infusion valve body according to claim 1, characterized in that: The liquid inlet end includes a connecting portion and a bottom, the liquid inlet is arranged on the outer peripheral surface of the connecting portion, the bottom is connected to one end of the connecting portion close to the liquid outlet, and the outer diameter of the bottom gradually increases in the straight extension direction of the cavity from the liquid inlet end toward the liquid outlet end.

4. The needle-free infusion valve body according to claim 3, characterized in that: The liquid inlet end further includes a top portion, which is connected to an end of the connecting portion facing away from the bottom portion, and an outer diameter of the top portion gradually increases in a straight line extending direction of the cavity from the liquid inlet end toward the liquid outlet end.

5. The needle-free infusion valve body according to claim 4, characterized in that: The outer peripheral surface of the top and the outer peripheral surface of the bottom are both conical surfaces, and the taper of the top is less than or equal to the taper of the bottom.

6. The needle-free infusion valve body according to claim 4, characterized in that: The outer circumferential surface of the top portion and the outer circumferential surface of the connecting portion are connected in a smooth transition, and the outer circumferential surface of the connecting portion and the outer circumferential surface of the bottom portion are connected in a smooth transition.

7. The needle-free infusion valve body according to claim 4, characterized in that: The inner wall of the connecting portion and the inner wall of the bottom are connected in a smooth transition.

8. A needle-free infusion connector, characterized in that: It comprises a valve core, a shell and a needle-free infusion valve body according to any one of claims 1 to 7, wherein the shell has a receiving space, the needle-free infusion valve body is located in the receiving space and connected to the shell, and the valve core is sleeved on the outer peripheral surface of the liquid inlet end and covers the liquid inlet; When the infusion device extends into the accommodation space and is sleeved on the outer periphery of the liquid inlet end, the infusion device squeezes the valve core so that the valve core opens the liquid inlet, and the infusion device delivers / extracts liquid to / from the liquid inlet; When the infusion device leaves the accommodating space from the periphery of the liquid inlet end, the valve core recovers its deformation to reclose the liquid inlet.

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