Intraocular injection assembly

Abstract

The invention provides an intraocular injection assembly, and relates to the technical field of medical instruments. The intraocular injection assembly comprises an injection needle seat and an injection needle; a plurality of first auxiliary channels which extend in the axial direction of the injection needle base and are sequentially communicated with one another are arranged in the injection needle base, the diameters of the first auxiliary channels are sequentially reduced in the direction from the first end to the second end of the injection needle base, and the first auxiliary channels are matched to form a first injection channel; at least two second auxiliary channels which extend in the axial direction of the injection needle and are sequentially communicated with one another are arranged in the injection needle, the diameters of the second auxiliary channels are sequentially reduced in the direction from the first end to the second end of the injection needle, and the second auxiliary channels are matched to form a second injection channel; the injection needle is connected to the second end of the injection needle base, and the first end of the injection needle base can be connected to an outlet of an external injector so that the second injection channel can be communicated with the external injector through the first injection channel. According to the intraocular injection assembly, the flowing speed is increased, the injection time is shortened, and the infection risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to an intraocular injection assembly. Background Art

[0002] Intraocular injection filling is a common method in surgeries for retinopathy, age-related macular degeneration, endophthalmitis, etc. Especially in retinopathy surgery, the syringe needs to be inserted into the ciliary body flat part to inject silicone oil or heavy water into the vitreous cavity. The filled silicone oil or heavy water pushes the retina back to its original position, closes the hole, and keeps the retina stable.

[0003] The existing injection needle has a long and slender inner cavity, so when injecting silicone oil or heavy water, the fluid resistance in the injection needle is relatively large, resulting in a longer injection time of silicone oil or heavy water, which in turn prolongs the operation time and may increase the risk of eye infection in patients. Summary of the invention

[0004] The object of the present invention is to provide an intraocular injection assembly, which can increase the flow rate, shorten the injection time and reduce the risk of infection.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Intraocular injection set, comprising:

[0007] An injection needle seat, wherein a plurality of first auxiliary channels are arranged in the injection needle seat, all extending along the axial direction of the injection needle seat and sequentially connected to each other, and the diameters of the plurality of first auxiliary channels decrease sequentially from the first end of the injection needle seat to the second end of the injection needle seat, and cooperate to form a channel that penetrates the injection needle seat along the axial direction of the injection needle seat;

[0008] An injection needle, wherein at least two second auxiliary channels are provided in the injection needle, both extending along the axial direction of the injection needle and sequentially connected to each other, and the diameter of each of the second auxiliary channels decreases sequentially from the first end of the injection needle to the second end of the injection needle, and cooperate to form a second injection channel penetrating the injection needle along the axial direction of the injection needle;

[0009] The first end of the injection needle is connected to the second end of the injection needle seat, and the first end of the injection needle seat can be connected to the outlet of the external syringe, so that the second injection channel is connected to the external syringe through the first injection channel.

[0010] As a further technical solution, in a direction from the first end of the injection needle seat to the second end of the injection needle seat, the plurality of first auxiliary channels are sequentially arranged as a Luer connector conical channel, a transition channel and a first connecting channel, and the Luer connector conical channel can be communicated with the outlet of an external syringe;

[0011] In the direction from the first end of the injection needle to the second end of the injection needle, each of the second auxiliary channels is sequentially configured as a second connecting channel and a standard injection channel, and the second end of the injection needle is inserted into the injection needle seat from the conical channel of the Luer connector and extends out of the first connecting channel to connect the first injection channel and the second injection channel.

[0012] As a further technical solution, the conical channel of the Luer connector and the transition channel are smoothly connected, and in the direction from the first end of the injection needle to the second end of the injection needle, the first end of the injection needle is provided with a guide surface inclined toward the axis direction of the injection needle, and the guide surface is smoothly connected to the inner wall of the first injection channel.

[0013] As a further technical solution, in a direction from the first end of the injection needle seat to the second end of the injection needle seat, the inner diameter of the first connecting channel gradually decreases, and the transition channel is smoothly transitionally connected to the first connecting channel;

[0014] After the injection needle is inserted into the injection needle seat, the outer wall of the first end of the injection needle is interference fit with the inner wall of the first connecting channel, and the end surface of the first end of the injection needle is set as the guide surface.

[0015] As a further technical solution, an abutment step is arranged between the transition channel and the first connecting channel, and the first end of the injection needle is provided with an abutment flange capable of abutting against the abutment step, and the end surface of the abutment flange facing away from the standard injection channel is set as the guide surface.

[0016] As a further technical solution, a sealing groove is provided on one of the end surfaces of the abutting step and the abutting flange close to the abutting step, and a sealing convex track is provided on the other end surface, and both the sealing groove and the sealing convex track extend in a ring shape along the circumference of the injection needle seat, and when the abutting flange abuts against the abutting step, the sealing convex track is clamped in the sealing groove;

[0017] And / or, when the abutting flange abuts against the abutting step, a sealing rubber ring is provided between the abutting step and the abutting flange.

[0018] As a further technical solution, a limiting slot is provided on one of the abutting step and the abutting flange, and a limiting block is correspondingly provided on the other one. When the injection needle is inserted into the injection needle seat, the limiting block is limitedly engaged with the limiting slot.

[0019] As a further technical solution, the outer wall of the first end of the injection needle is bonded to the inner wall of the first connecting channel.

[0020] As a further technical solution, the injection needle and the injection needle seat are integrally formed.

[0021] As a further technical solution, the intraocular injection assembly further comprises an injection needle cap, and the injection needle cap can be detachably mounted on the injection needle seat.

[0022] Compared with the prior art, the intraocular injection assembly provided by the present invention has the following technical advantages:

[0023] Since the diameters of the multiple first auxiliary channels decrease in sequence from the first end of the injection needle seat to the second end of the injection needle seat, and the diameters of the second auxiliary channels decrease in sequence from the first end of the injection needle to the second end of the injection needle, the first injection channel and the second injection channel are both variable diameter channels with decreasing diameters in sequence along the direction of the injection needle in the injection needle seat; therefore, during the process of injecting silicone oil or heavy water, when silicone oil or heavy water passes through the first injection channel and the second injection channel in sequence from the external syringe, the silicone oil flows from the channel with a large diameter to the channel with a small diameter in sequence, reducing the injection resistance, thereby shortening the injection time and reducing the risk of infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 is a cross-sectional view of a first embodiment of an intraocular injection assembly provided by an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0027] Figure 3 is a cross-sectional view of a second embodiment of an intraocular injection assembly provided by an embodiment of the present invention;

[0028] Figure 4 yes Figure 3A partial enlarged view of point B in the middle;

[0029] Figure 5 is a cross-sectional view of an injection needle holder in an intraocular injection assembly provided by an embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of an injection needle in an intraocular injection assembly provided by an embodiment of the present invention;

[0031] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0032] Figure 8 It is a schematic diagram of the disassembly of the intraocular injection assembly provided in an embodiment of the present invention.

[0033] In the figure:

[0034] 100, injection needle seat; 110, Luer connector conical channel; 120, transition channel; 130, first connecting channel; 101, abutment step; 102, sealing groove;

[0035] 200, injection needle; 210, second connecting channel; 220, standard injection channel; 201, abutment flange; 202, sealing convex rail; 203, limit block;

[0036] 310, Sealing rubber ring;

[0037] 400. Injection needle cap. DETAILED DESCRIPTION

[0038] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0039] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0040] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0041] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0042] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0043] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0045] Combination Figures 1 to 8As shown, the intraocular injection assembly provided in this embodiment is used to inject fluids such as silicone oil or heavy water into the eye, and during the injection process, the flow rate is increased, the injection time is shortened, and the risk of infection is reduced. Specifically, the intraocular injection assembly includes an injection needle seat 100 and an injection needle 200: the injection needle seat 100 is provided with a plurality of first auxiliary channels, each extending along the axial direction of the injection needle seat 100 and being interconnected in sequence, and the diameters of the plurality of first auxiliary channels decrease in sequence from the first end of the injection needle seat 100 to the second end of the injection needle seat 100, and cooperate to form a second injection channel that penetrates the injection needle seat 100 along the axial direction of the injection needle seat 100; the injection needle 200, the injection needle 200 is provided with at least two second auxiliary channels, each extending along the axial direction of the injection needle 200 and being interconnected in sequence, and the diameters of the second auxiliary channels decrease in sequence from the first end of the injection needle 200 to the second end of the injection needle 200, and cooperate to form a second injection channel that penetrates the injection needle 200 along the axial direction of the injection needle 200; the first end of the injection needle 200 is connected to the second end of the injection needle seat 100, and the first end of the injection needle seat 100 can be connected to the outlet of an external syringe (not shown in the figure) so that the second injection channel is communicated with the external syringe through the first injection channel.

[0046] Since the diameters of the plurality of first auxiliary channels decrease in sequence from the first end of the needle seat 100 to the second end of the needle seat 100, and the diameters of the second auxiliary channels decrease in sequence from the first end of the needle head 200 to the second end of the needle head 200. Thus, along the direction of the needle head 200 in the needle seat 100, the first injection channel and the second injection channel are both variable diameter channels with decreasing diameters; therefore, in the process of injecting silicone oil or heavy water, when silicone oil or heavy water passes through the first injection channel and the second injection channel in sequence from the external syringe, when silicone oil flows from the channel with a large diameter to the channel with a small diameter in sequence, the injection resistance is reduced, thereby shortening the injection time and reducing the risk of infection.

[0047] Specifically, refer to the flow rate (FlowrateFR) formula:

[0048]

[0049] Among them, Flowrate is the outflow rate, pressuredifference is the pressure difference, η is the density of the injection liquid, L is the overall length of the injection channel, and r is the inner diameter of the injection channel. It can be seen from the above formula that the outflow rate is proportional to the pressure difference and inversely proportional to the resistance in the injection channel; the pressure difference depends on the positive pressure level of the injection assembly and the intraocular pressure; the resistance in the injection channel depends on the density of the injection liquid, the overall length of the needle injection channel, and the inner diameter of the injection channel; combined with the formula, it can be concluded that when the pressure difference remains unchanged, the smaller the inner diameter of the injection channel, the longer the overall length of the needle injection channel, the greater the resistance in the injection channel, and the lower the fluid outflow rate. Therefore, in this embodiment, the resistance in the injection channel is reduced by multiple diameter changes to increase the fluid outflow rate, that is, to increase the injection speed.

[0050] In this embodiment, the first injection channel is composed of three variable diameter sections arranged in sequence, and the second injection channel is composed of two variable diameter sections arranged in sequence. In other embodiments, the number of variable diameter sections constituting the first injection channel can be set to two, four, five, etc. according to specific needs; the number of variable diameter sections constituting the second injection channel can be set to three, four, five, etc. according to specific needs.

[0051] Specifically, from the first end of the injection needle seat 100 to the second end of the injection needle seat 100, a plurality of first auxiliary channels are sequentially arranged as a Luer connector conical channel 110, a transition channel 120 and a first connecting channel 130, and the Luer connector conical channel 110 can be connected to the outlet of an external syringe; the Luer connector conical channel 110 is a standard connecting channel, so that the injection needle seat 100 can be connected to the outlet of an external syringe of any specification, thereby improving the applicability of the intraocular injection assembly. By setting the transition channel 120, the inner diameter of the first injection channel is gradually reduced to avoid the situation of sudden change in the inner diameter, and the flow effect of the fluid in the first injection channel during injection is ensured. From the first end of the injection needle 200 to the second end of the injection needle 200, each second auxiliary channel is sequentially arranged as a second connecting channel 210 and a standard injection channel 220, and the second end of the injection needle 200 is inserted into the injection needle seat 100 from the Luer connector conical channel 110 and extends out of the first connecting channel 130, so that the first injection channel and the second injection channel are connected. The second connecting channel 210 is connected to the first connecting channel 130. The diameter of the standard injection channel 220 can be set according to actual needs, so that the outer diameter of the injection needle 200 area corresponding to the standard injection channel 220 is a standard outer diameter size. For example, the outer diameter of the injection needle 200 area corresponding to the standard injection channel 220 is 20G, 23G, 25G, 27G, etc., so as to facilitate use in combination with other ophthalmic surgical instruments.

[0052] Preferably, the Luer connector conical channel 110 and the transition channel 120 are smoothly connected, and in the direction from the first end of the injection needle 200 to the second end of the injection needle 200, the first end of the injection needle 200 is provided with a guide surface (not shown in the figure) inclined toward the axis direction of the injection needle 200, and the guide surface is smoothly connected to the inner wall of the first injection channel. The Luer connector conical channel 110 and the transition channel 120 are smoothly connected, and the guide surface is smoothly connected to the inner wall of the first injection channel, so as to reduce the resistance of the injection needle seat 100 and the injection needle 200 structure to the injected fluid, thereby further improving the injection speed.

[0053] In this embodiment, the injection needle seat 100 and the injection needle 200 can be integrally formed. This arrangement does not require assembly during use, thereby improving processing convenience and improving the connection strength and connection stability between the two. Alternatively, the injection needle seat 100 and the injection needle 200 are separately formed, and after the molding is completed, the injection needle 200 is connected to the second end of the injection needle seat 100. This arrangement can reduce the difficulty of production and processing of the injection assembly, thereby improving processing efficiency and reducing processing costs.

[0054] After the injection needle seat 100 and the injection needle 200 are separately formed, the injection needle 200 is connected to the second end of the injection needle seat 100 in three ways, which are provided in this embodiment:

[0055] The first one is that the inner diameter of the first connecting channel 130 gradually decreases from the first end of the injection needle seat 100 to the second end of the injection needle seat 100, and the transition channel 120 is smoothly transitioned and connected to the first connecting channel 130; after the injection needle 200 is inserted into the injection needle seat 100, the outer wall of the first end of the injection needle 200 is interference fit with the inner wall of the first connecting channel 130, and the end face of the first end of the injection needle 200 is set as a guide surface.

[0056] Specifically, the transition channel 120 is smoothly connected to the first connection channel 130, and the guide surface is smoothly connected to the inner wall of the first injection channel, so as to reduce the resistance of the transition channel 120 to the first connection channel 130 and the first injection channel to the second connection channel 210, thereby further improving the injection efficiency. From the first end of the injection needle seat 100 to the second end of the injection needle seat 100, the inner diameter of the first connection channel 130 is gradually reduced, and from the first end of the injection needle 200 to the second end of the injection needle 200, the outer diameter of the injection needle 200 can be set to gradually reduce or remain unchanged; after the first injection channel at the second end of the injection needle 200 is inserted into the injection needle seat 100, the outer wall of the first end of the injection needle 200 is interference-fitted with the inner wall of the first connection channel 130, so that the injection needle 200 is fixedly set at the second end of the injection needle seat 100.

[0057] The second type is that an abutting step 101 is provided between the transition channel 120 and the first connecting channel 130, and an abutting flange 201 capable of abutting against the abutting step 101 is provided at the first end of the injection needle 200, and the abutting flange 201 abuts against the abutting step 101, so that the injection needle 200 is set at the second end of the injection needle seat 100, and the end surface of the abutting flange 201 away from the standard injection channel 220 is set as a guide surface to achieve a smooth transition connection between the second connecting channel 210 and the transition channel 120, thereby reducing the flow resistance of the fluid to be injected at the abutting flange 201. In addition, in this embodiment, in the direction from the first end of the injection needle seat 100 to the second end of the injection needle seat 100, the inner diameter of the first connecting channel 130 can be set to gradually decrease, or can be set to remain unchanged, and the outer diameter of the injection needle 200 is set corresponding to the inner diameter of the first connecting channel 130.

[0058] Furthermore, a sealing groove 102 is provided on one of the end faces of the abutting step 101 and the abutting flange 201 close to the end face of the abutting step 101, and a sealing convex rail 202 is provided on the other end face. Both the sealing groove 102 and the sealing convex rail 202 extend in a ring shape along the circumference of the injection needle seat 100. When the abutting flange 201 abuts against the abutting step 101, the sealing convex rail 202 is clamped in the sealing groove 102.

[0059] Combination Figure 1 and Figure 2 As shown, in this embodiment, the sealing groove 102 is arranged on the abutting step 101, and the sealing convex rail 202 is arranged on the end surface of the abutting flange 201 close to the abutting step 101. The sealing convex rail 202 is clamped in the sealing groove 102 to improve the sealing between the first injection channel and the second injection channel.

[0060] or combined Figure 3 and Figure 4 As shown, when the abutting flange 201 abuts against the abutting step 101, a sealing rubber ring 310 is provided between the abutting step 101 and the abutting flange 201. By providing the sealing rubber ring 310, the sealing performance between the first injection channel and the second injection channel is improved.

[0061] In some other embodiments, a sealing groove 102 is provided on the abutting step 101 , a sealing convex rail 202 is provided on the end surface of the abutting flange 201 close to the abutting step 101 , and a sealing rubber ring 310 is provided between the abutting step 101 and the abutting flange 201 .

[0062] Furthermore, a limiting card slot (not shown in the figure) is provided on one of the abutting step 101 and the abutting flange 201, and a limiting card block 203 is correspondingly provided on the other. When the injection needle 200 is inserted into the injection needle seat 100, the limiting card block 203 is limitedly connected to the limiting card slot.

[0063] Specific combination Figure 6 and Figure 7 As shown, in this embodiment, the limit block 203 is arranged on the end face of the abutting flange 201 close to the abutting step 101, and along the circumference of the abutting flange 201, a plurality of limit blocks 203 are arranged at intervals on the abutting flange 201, and a plurality of limit slots are arranged at corresponding intervals on the abutting step 101. When the abutting flange 201 abuts against the abutting step 101, the plurality of limit blocks 203 are correspondingly connected to the plurality of limit slots, thereby limiting the relative rotation of the injection needle seat 100 and the injection needle 200 in the circumferential direction, avoiding the relative rotation of the injection needle 200 and the injection needle seat 100, thereby ensuring the use effect of the intraocular injection assembly.

[0064] In some other embodiments, the limiting block 203 may also be disposed on the outer wall of the first end of the injection needle 200 , and the limiting groove is correspondingly disposed on the inner wall of the first injection channel.

[0065] The third method is to bond the outer wall of the first end of the injection needle 200 to the inner wall of the first connecting channel 130, and bond the injection needle 200 to the second end of the injection needle seat 100 so that the second injection channel is connected to the external syringe through the first injection channel.

[0066] Preferably, the intraocular injection assembly further comprises an injection needle cap 400, which can be detachably mounted on the injection needle seat 100. By setting the injection needle cap 400, in the non-working state, the injection needle cap 400 is mounted on the injection needle seat 100, which protects the injection needle seat 100 and the injection needle 200, and prevents external equipment from causing damage to the injection needle seat 100 and the injection needle 200, thereby ensuring their use effect; at the same time, it prevents the injection needle 200 from stabbing the operator, so as to improve the storage convenience and safety. In the working state, the injection needle cap 400 can be removed from the injection needle seat 100 for injection, so as to ensure the convenience of use.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An intraocular injection assembly, characterized in that include: An injection needle seat (100), wherein a plurality of first auxiliary channels are arranged in the injection needle seat (100), all extending along the axial direction of the injection needle seat (100) and sequentially connected to each other, and the diameters of the plurality of first auxiliary channels decrease sequentially in a direction from the first end of the injection needle seat (100) to the second end of the injection needle seat (100), and cooperate to form a first injection channel that penetrates the injection needle seat (100) along the axial direction of the injection needle seat (100); An injection needle (200), wherein at least two second auxiliary channels are arranged inside the injection needle (200), both extending along the axial direction of the injection needle (200) and being sequentially interconnected, and the diameters of the second auxiliary channels decrease sequentially in the direction from the first end of the injection needle (200) to the second end of the injection needle (200), and cooperate to form a second injection channel that penetrates the injection needle (200) along the axial direction of the injection needle (200); The first end of the injection needle (200) is connected to the second end of the injection needle seat (100), and the first end of the injection needle seat (100) can be connected to the outlet of the external syringe so that the second injection channel is connected to the external syringe through the first injection channel.

2. The intraocular injection assembly according to claim 1, characterized in that: In a direction from the first end of the injection needle seat (100) to the second end of the injection needle seat (100), the plurality of first auxiliary channels are sequentially arranged as a Luer connector conical channel (110), a transition channel (120) and a first connecting channel (130), and the Luer connector conical channel (110) can be communicated with an outlet of an external syringe; In the direction from the first end of the injection needle (200) to the second end of the injection needle (200), each of the second auxiliary channels is sequentially configured as a second connecting channel (210) and a standard injection channel (220); the second end of the injection needle (200) is inserted into the injection needle seat (100) from the Luer connector conical channel (110) and extends out of the first connecting channel (130) so that the first injection channel and the second injection channel are connected.

3. The intraocular injection assembly according to claim 2, characterized in that: The Luer connector conical channel (110) and the transition channel (120) are smoothly transitionally connected. In the direction from the first end of the injection needle (200) to the second end of the injection needle (200), the first end of the injection needle (200) is provided with a guide surface inclined toward the axis direction of the injection needle (200), and the guide surface is smoothly transitionally connected to the inner wall of the first injection channel.

4. The intraocular injection assembly according to claim 3, characterized in that: In a direction from the first end of the injection needle seat (100) to the second end of the injection needle seat (100), the inner diameter of the first connecting channel (130) gradually decreases, and the transition channel (120) is smoothly transitionally connected to the first connecting channel (130); After the injection needle (200) is inserted into the injection needle seat (100), the outer wall of the first end of the injection needle (200) is interference-fitted with the inner wall of the first connecting channel (130), and the end surface of the first end of the injection needle (200) is arranged as the guide surface.

5. The intraocular injection assembly according to claim 3, characterized in that: An abutment step (101) is provided between the transition channel (120) and the first connecting channel (130), and a first end of the injection needle (200) is provided with an abutment flange (201) capable of abutting against the abutment step (101), and an end surface of the abutment flange (201) facing away from the standard injection channel (220) is provided as the guide surface.

6. The intraocular injection assembly according to claim 5, characterized in that: A sealing groove (102) is provided on one of the end surfaces of the abutting step (101) and the abutting flange (201) close to the abutting step (101), and a sealing convex track (202) is provided on the other end surface; the sealing groove (102) and the sealing convex track (202) both extend in a ring shape along the circumference of the injection needle seat (100); when the abutting flange (201) abuts against the abutting step (101), the sealing convex track (202) is clamped in the sealing groove (102); And / or, when the abutting flange (201) abuts against the abutting step (101), a sealing rubber ring (310) is provided between the abutting step (101) and the abutting flange (201).

7. The intraocular injection assembly according to claim 5, characterized in that: A limiting card slot is provided on one of the abutting step (101) and the abutting flange (201), and a limiting card block (203) is correspondingly provided on the other one; when the injection needle (200) is inserted into the injection needle seat (100), the limiting card block (203) is limitedly engaged with the limiting card slot.

8. The intraocular injection assembly according to claim 2, characterized in that: The outer wall of the first end of the injection needle (200) is bonded to the inner wall of the first connecting channel (130).

9. The intraocular injection assembly according to claim 2, characterized in that: The injection needle (200) and the injection needle seat (100) are integrally formed.

10. The intraocular injection assembly according to any one of claims 1 to 9, characterized in that: The intraocular injection assembly further comprises an injection needle cap (400), and the injection needle cap (400) can be detachably mounted on the injection needle seat (100).

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