Intraocular injection assembly

Abstract

Provided is an intraocular injection assembly, comprising an injection needle base and an injection needle head. The injection needle base is internally provided with a plurality of first auxiliary channels, each extending in an axial direction of the injection needle base, which are in sequential communication with each other, and in a direction from a first end to a second end of the injection needle base, the diameters of the plurality of first auxiliary channels sequentially decrease, and the plurality of first auxiliary channels cooperate to form a first injection channel. The injection needle head is internally provided with at least two second auxiliary channels, each extending in an axial direction of the injection needle head, which are in sequential communication with each other, and in a direction from a first end to a second end of the injection needle head, the diameters of the second auxiliary channels sequentially decrease, and the second auxiliary channels cooperate to form a second injection channel. The injection needle head 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 syringe, such that the second injection channel is in communication with the external syringe by means of the first injection channel.

Description

Intraocular injection components

[0001] This application claims priority to Chinese Patent Application No. 202411928833.4, filed with the Chinese Patent Office on December 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of medical device technology, such as an intraocular injection component. Background Technology

[0003] Intraocular injection tamponade is a common procedure used during surgeries for retinal diseases, age-related macular degeneration, and endophthalmitis. Especially in retinal disease surgeries, the syringe is inserted into the pars plana of the ciliary body to inject silicone oil or heavy water into the vitreous cavity. The injected silicone oil or heavy water pushes the retina back into its original position, seals the retinal tear, and maintains retinal stability.

[0004] Because conventional injection needles have a narrow and long inner lumen, the fluid resistance inside the needle is relatively high when injecting silicone oil or heavy water, resulting in a longer injection time and thus prolonging the operation time, which may increase the risk of eye infection for the patient. Summary of the Invention

[0005] This application provides an intraocular injection component that increases flow rate, shortens injection time, and reduces the risk of infection.

[0006] This application provides an intraocular injection assembly, comprising:

[0007] An injection needle hub is provided with a plurality of first auxiliary channels that extend along the axial direction of the injection needle hub and are interconnected in sequence. The diameter of the plurality of first auxiliary channels decreases sequentially from the first end of the injection needle hub to the second end of the injection needle hub, and they cooperate to form a channel that penetrates the injection needle hub along the axial direction of the injection needle hub.

[0008] An injection needle is provided with at least two second auxiliary channels that extend along the axial direction of the injection needle and are connected to each other in sequence. The diameter of each second auxiliary channel decreases sequentially from the first end of the injection needle to the second end of the injection needle, and they cooperate to form a second injection channel that penetrates 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 hub, and the first end of the injection needle hub can be connected to the outlet of an external syringe so that the second injection channel communicates with the external syringe through the first injection channel.

[0010] In some embodiments, from the first end of the injection needle hub to the second end of the injection needle hub, a plurality of the first auxiliary channels are sequentially configured as a Luer connector conical channel, a transition channel and a first connecting channel, wherein the Luer connector conical channel is capable of communicating with the outlet of an external syringe;

[0011] 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. The second end of the injection needle is inserted into the injection needle seat from the Luer connector conical channel and extends out of the first connecting channel so that the first injection channel and the second injection channel are connected.

[0012] In some embodiments, the Luer connector conical channel and the transition channel are smoothly connected. 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 that is inclined toward the axis of the injection needle. The guide surface is smoothly connected to the inner wall of the first injection channel.

[0013] In some embodiments, from the first end of the injection needle hub to the second end of the injection needle hub, the inner diameter of the first connecting channel gradually decreases, and the transition channel smoothly transitions to the first connecting channel;

[0014] After the injection needle is inserted into the injection needle hub, the outer wall of the first end of the injection needle is press-fitted with the inner wall of the first connecting channel, and the end face of the first end of the injection needle is set as the guide surface.

[0015] In some embodiments, an abutment step is provided between the transition channel and the first connecting channel, and the first end of the injection needle is provided with an abutment flange that can abut against the abutment step, and the end face of the abutment flange away from the standard injection channel is configured as the guide surface.

[0016] In some embodiments, a sealing groove is provided on one of the abutting step and the abutting flange near the end face of the abutting step, and a sealing rail is provided on the other. Both the sealing groove and the sealing rail extend in a ring shape along the circumference of the injection needle seat. When the abutting flange abuts against the abutting step, the sealing rail is engaged in the sealing groove.

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

[0018] In some embodiments, a limiting groove is provided on one of the abutting step and the abutting flange, and a limiting block is provided on the other. When the injection needle is inserted into the injection needle seat, the limiting block is limited and engaged with the limiting groove.

[0019] In some embodiments, the outer wall of the first end of the injection needle is bonded to the inner wall of the first connecting channel.

[0020] In some embodiments, the injection needle and the injection needle hub are integrally formed.

[0021] In some embodiments, the intraocular injection assembly further includes an injection needle cap that can be detachably fitted onto the injection needle hub. Attached Figure Description

[0022] Figure 1 is a cross-sectional view of a first embodiment of the intraocular injection assembly provided in this application;

[0023] Figure 2 is a magnified view of part A in Figure 1;

[0024] Figure 3 is a cross-sectional view of a second embodiment of the intraocular injection component provided in this application;

[0025] Figure 4 is a magnified view of part B in Figure 3;

[0026] Figure 5 is a cross-sectional view of the injection needle hub in the intraocular injection assembly provided in an embodiment of this application;

[0027] Figure 6 is a schematic diagram of the structure of the injection needle in the intraocular injection assembly provided in an embodiment of this application;

[0028] Figure 7 is a magnified view of point C in Figure 6;

[0029] Figure 8 is a disassembly diagram of the intraocular injection assembly provided in an embodiment of this application.

[0030] In the diagram: 100, injection needle hub; 110, Luer connector conical channel; 120, transition channel; 130, first connecting channel; 101, abutment step; 102, sealing groove; 200, injection needle; 210, second connecting channel; 220, standard injection channel; 201, abutment flange; 202, sealing convex rail; 203, limit block; 310, sealing rubber ring; 400, injection needle cap. Detailed Implementation

[0031] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0032] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0033] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0034] In this application, relative terms used in conjunction with quantities or conditions (e.g., “about,” “approximately,” “basically,” etc.) include the stated value and have the meaning indicated by the context. For example, the relative term may include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0035] In this application, 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 be performed by one part, one component, or a combination of multiple parts.

[0036] In this application, directional terms such as "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings. Furthermore, in the context of a connection between an element and another element, "upper" or "lower" can mean not only directly connected but also indirectly connected via an intermediate element. Directional terms such as "upper side," "lower side," "left side," "right side," "front side," and "rear side" not only represent direct orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower back.

[0037] As shown in Figures 1 to 8, the intraocular injection assembly provided in this embodiment is used to inject fluids such as silicone oil or heavy water into the eye. During the injection process, it increases the flow rate, shortens the injection time, and reduces the risk of infection. The intraocular injection assembly includes an injection needle hub 100 and an injection needle 200. The injection needle hub 100 has multiple first auxiliary channels extending axially along the needle hub 100 and interconnected sequentially. The diameters of the multiple first auxiliary channels decrease sequentially from the first end to the second end of the needle hub 100, forming a second injection channel that penetrates the needle hub 100 axially. The injection needle 200 has at least two second auxiliary channels extending axially along the needle head 200 and interconnected sequentially. The diameters of the second auxiliary channels decrease sequentially from the first end to the second end of the needle head 200, forming a second injection channel that penetrates the needle head 200 axially. The first end of the injection needle 200 is connected to the second end of the injection needle hub 100, and the first end of the injection needle hub 100 can be connected to the outlet of an external syringe, allowing the second injection channel to communicate with the external syringe through the first injection channel.

[0038] Because the diameters of the multiple first auxiliary channels decrease sequentially from the first end to the second end of the injection needle holder 100, and the diameters of the second auxiliary channels decrease sequentially from the first end to the second end of the injection needle 200, both the first and second injection channels are variable-diameter channels with progressively decreasing diameters along the direction of the injection needle 200 in the injection needle holder 100. Therefore, during the injection of silicone oil or heavy water, when the silicone oil or heavy water flows sequentially from the external syringe through the first and second injection channels, the silicone oil flows from the larger diameter channel through the smaller diameter channel, reducing injection resistance, thereby shortening the injection time and reducing the risk of infection.

[0039] For example, refer to the formula for outflow rate (FlowrateFR):

[0040] Wherein, Flowrate is the outflow rate, Pressure difference is the pressure differential, η is the density of the injected fluid, L is the overall length of the injection channel, and r is the inner diameter of the injection channel. From the above formula, it can be seen that the outflow rate is directly proportional to the pressure differential and inversely proportional to the resistance within the injection channel. The pressure differential depends on the positive pressure level of the injection assembly and the intraocular pressure. The resistance within the injection channel depends on the density of the injected fluid, the overall length of the needle injection channel, and the inner diameter of the injection channel. Combining the formula, it can be concluded that when the pressure differential remains constant, the smaller the inner diameter of the injection channel and the longer the overall length of the needle injection channel, the greater the resistance within the injection channel and the lower the fluid outflow rate. Therefore, in this embodiment, by repeatedly changing the diameter, the resistance within the injection channel is reduced, and the fluid outflow rate is increased, i.e., the injection speed is increased.

[0041] In this embodiment, the first injection channel is described as consisting of three sequentially arranged variable-diameter sections, and the second injection channel is described as consisting of two sequentially arranged variable-diameter sections. In other embodiments, the number of variable-diameter sections constituting the first injection channel can be set to two, four, five, etc., according to actual needs; the number of variable-diameter sections constituting the second injection channel can be set to three, four, five, etc., according to actual needs.

[0042] In some embodiments, from the first end of the injection needle hub 100 to the second end of the injection needle hub 100, a plurality of first auxiliary channels are sequentially configured as a Luer connector conical channel 110, a transition channel 120, and a first connecting channel 130. The Luer connector conical channel 110 can communicate with the outlet of an external syringe. The Luer connector conical channel 110 is a standard connecting channel to facilitate the connection of the injection needle hub 100 with the outlet of an external syringe of any size, 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 abrupt changes in the inner diameter and ensure the flow effect of fluid in the first injection channel during injection. From the first end of the injection needle 200 to the second end of the injection needle 200, each second auxiliary channel 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 hub 100 from the Luer connector conical channel 110 and extends out of the first connecting channel 130 to communicate between the first injection channel and the second injection channel. 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 the standard outer diameter size. For example, the outer diameter of the injection needle 200 area corresponding to the standard injection channel 220 can be 20G, 23G, 25G, 27G, etc., so as to facilitate its use in conjunction with other ophthalmic surgical instruments.

[0043] In some embodiments, the Luer connector conical channel 110 and the transition channel 120 are smoothly connected. 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 towards the axis of the injection needle 200. The guide surface is smoothly connected to the inner wall of the first injection channel. The smooth connection between the Luer connector conical channel 110 and the transition channel 120, and the smooth connection between the guide surface and the inner wall of the first injection channel, reduces the resistance of the injection needle hub 100 and the injection needle 200 themselves to the injected fluid, thereby further improving the injection speed.

[0044] In this embodiment, the injection needle hub 100 and the injection needle 200 can be integrally molded. This configuration eliminates the need for assembly during use, improving processing convenience and enhancing the connection strength and stability between the two. Alternatively, the injection needle hub 100 and the injection needle 200 can be molded separately. After molding, the injection needle 200 is connected to the second end of the injection needle hub 100. This configuration reduces the manufacturing difficulty of the injection components, thereby improving processing efficiency and reducing processing costs.

[0045] After the injection needle hub 100 and the injection needle tip 200 are separately formed, the connection method for the injection needle tip 200 to the second end of the injection needle hub 100 is provided in this embodiment in three ways:

[0046] In the first case, from the first end of the injection needle holder 100 to the second end of the injection needle holder 100, the inner diameter of the first connecting channel 130 gradually decreases, and the transition channel 120 is smoothly connected to the first connecting channel 130; after the injection needle 200 is inserted into the injection needle holder 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 face of the first end of the injection needle 200 is set as a guide surface.

[0047] In some embodiments, the transition channel 120 is smoothly connected to the first connecting channel 130, and the guide surface is smoothly connected to the inner wall of the first injection channel. This reduces the resistance to the injected fluid at the connection between the transition channel 120 and the first connecting channel 130, and at the connection between the first injection channel and the second connecting channel 210, thereby further improving injection efficiency. From the first end of the injection needle holder 100 to the second end of the injection needle holder 100, the inner diameter of the first connecting channel 130 gradually decreases. 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 decrease or remain constant. After the second end of the injection needle 200 is inserted into the injection needle holder 100 through the first injection channel, the outer wall of the first end of the injection needle 200 is press-fitted with the inner wall of the first connecting channel 130 to fix the injection needle 200 to the second end of the injection needle holder 100.

[0048] In the second embodiment, an abutment step 101 is provided between the transition channel 120 and the first connecting channel 130. The first end of the injection needle 200 is provided with an abutment flange 201 that abuts against the abutment step 101. The abutment flange 201 abuts against the abutment step 101, thereby positioning the injection needle 200 at the second end of the injection needle holder 100. By setting the end face of the abutment flange 201 away from the standard injection channel 220 as a guide surface, a smooth transition connection between the second connecting channel 210 and the transition channel 120 is achieved, thereby reducing the flow resistance of the fluid to be injected at the abutment flange 201. Furthermore, in this embodiment, the inner diameter of the first connecting channel 130 can be set to gradually decrease or remain constant from the first end to the second end of the injection needle holder 100, and the outer diameter of the injection needle 200 is correspondingly set to the inner diameter of the first connecting channel 130.

[0049] In some embodiments, a sealing groove 102 is provided on one of the abutment step 101 and the abutment flange 201 near the end face of the abutment step 101, and a sealing rail 202 is provided on the other. Both the sealing groove 102 and the sealing rail 202 extend in a ring shape along the circumference of the injection needle seat 100. When the abutment flange 201 abuts against the abutment step 101, the sealing rail 202 is engaged in the sealing groove 102.

[0050] Referring to Figures 1 and 2, in this embodiment, the sealing groove 102 is disposed on the abutment step 101, and the sealing convex rail 202 is disposed on the end face of the abutment flange 201 near the abutment step 101. The sealing convex rail 202 is engaged in the sealing groove 102 to improve the sealing between the first injection channel and the second injection channel.

[0051] Alternatively, as shown in Figures 3 and 4, when the abutting flange 201 abuts against the abutting step 101, a sealing ring 310 is provided between the abutting step 101 and the abutting flange 201. By providing the sealing ring 310, the sealing performance between the first injection channel and the second injection channel is improved.

[0052] In some other embodiments, a sealing groove 102 is provided on the abutment step 101, and a sealing convex rail 202 is provided on the end face of the abutment flange 201 near the abutment step 101. At the same time, a sealing rubber ring 310 is provided between the abutment step 101 and the abutment flange 201.

[0053] In some embodiments, a limiting groove is provided on one of the abutting step 101 and the abutting flange 201, and a limiting block 203 is provided on the other. When the injection needle 200 is inserted into the injection needle seat 100, the limiting block 203 is limited and engaged in the limiting groove.

[0054] Referring to Figures 6 and 7, in this embodiment, the limiting block 203 is disposed on the end face of the abutting flange 201 near the abutting step 101, and multiple limiting blocks 203 are spaced apart on the abutting flange 201 along the circumference of the abutting flange 201. Multiple limiting slots are correspondingly spaced on the abutting step 101. When the abutting flange 201 abuts against the abutting step 101, the multiple limiting blocks 203 are correspondingly engaged with the multiple limiting slots, thereby limiting the relative rotation of the injection needle seat 100 and the injection needle 200 in the circumferential direction, preventing relative rotation between the injection needle 200 and the injection needle seat 100, and thus ensuring the effectiveness of the intraocular injection assembly.

[0055] 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 may be disposed on the inner wall of the first injection channel.

[0056] The third method involves bonding the outer wall of the first end of the injection needle 200 to the inner wall of the first connecting channel 130. By bonding the injection needle 200 to the second end of the injection needle seat 100, the second injection channel is connected to the external syringe through the first injection channel.

[0057] In some embodiments, the intraocular injection assembly further includes an injection needle cap 400, which is detachably fitted onto the injection needle holder 100. By providing the injection needle cap 400, in the non-operating state, the injection needle cap 400 is fitted onto the injection needle holder 100, protecting the injection needle holder 100 and the injection needle 200 from damage caused by external instruments, thereby ensuring their effectiveness; simultaneously, it prevents the injection needle 200 from pricking the operator, improving storage convenience and safety. In the operating state, the injection needle cap 400 can be removed from the injection needle holder 100 for injection, ensuring ease of use.

Claims

1. An intraocular injection assembly, comprising: An injection needle holder (100) is provided with a plurality of first auxiliary channels that extend along the axial direction of the injection needle holder (100) and are connected to each other in sequence. From the first end of the injection needle holder (100) to the second end of the injection needle holder (100), the diameter of the plurality of first auxiliary channels decreases in sequence and they cooperate to form a first injection channel that penetrates the injection needle holder (100) along the axial direction of the injection needle holder (100). An injection needle (200) is provided with at least two second auxiliary channels that extend along the axial direction of the injection needle (200) and are connected to each other in sequence. The diameter of each second auxiliary channel decreases sequentially from the first end of the injection needle (200) to the second end of the injection needle (200), and they 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 holder (100), and the first end of the injection needle holder (100) can be connected to the outlet of an external syringe so that the second injection channel communicates with the external syringe through the first injection channel.

2. The intraocular injection assembly according to claim 1, wherein, From the first end of the injection needle hub (100) to the second end of the injection needle hub (100), a plurality of the first auxiliary channels are sequentially configured as a Luer connector conical channel (110), a transition channel (120) and a first connecting channel (130), wherein the Luer connector conical channel (110) can communicate with the outlet of an external syringe; 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, wherein, The Luer connector conical channel (110) and the transition channel (120) are smoothly connected. 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 that is inclined towards the axis of the injection needle (200). The guide surface is smoothly connected to the inner wall of the first injection channel.

4. The intraocular injection assembly according to claim 3, wherein, From the first end of the injection needle hub (100) to the second end of the injection needle hub (100), the inner diameter of the first connecting channel (130) gradually decreases, and the transition channel (120) is smoothly 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 press-fitted 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 the guide surface.

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

6. The intraocular injection assembly according to claim 5, wherein, A sealing groove (102) is provided on one of the abutting step (101) and the abutting flange (201) near the end face of the abutting step (101), and a sealing rail (202) is provided on the other. The sealing groove (102) and the sealing rail (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 rail (202) is engaged in the sealing groove (102). And / or, when the abutting flange (201) abuts against the abutting step (101), a sealing ring (310) is provided between the abutting step (101) and the abutting flange (201).

7. The intraocular injection assembly according to claim 5, wherein, One of the abutting step (101) and the abutting flange (201) is provided with a limiting groove, and the other is provided with a corresponding limiting block (203). When the injection needle (200) is inserted into the injection needle seat (100), the limiting block (203) is limited and engaged with the limiting groove.

8. The intraocular injection assembly according to claim 2, wherein, 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, wherein, The injection needle (200) and the injection needle seat (100) are integrally formed.

10. The intraocular injection assembly according to any one of claims 1-9 further includes an injection needle cap (400), the injection needle cap (400) being detachably fitted onto the injection needle hub (100).

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