An injection device

Abstract

The application discloses an injection device, comprising: a syringe assembly and a cap, wherein the syringe assembly comprises a syringe and a lock cylinder, the lock cylinder is arranged at one end of the syringe, the inner side of the lock cylinder is provided with an internal thread, the side wall of the lock cylinder is provided with a first channel which is in communication with the inside of the lock cylinder, one end of the cap is provided with an external thread which is matched with the internal thread of the lock cylinder, and the top tooth of the external thread is provided with a spiral groove outside. When sterilization is carried out, ethylene oxide gas passes through the first channel and then reaches the joint of the tooth top and the tooth bottom of the thread matching through the spiral groove, so that the sterilization effect is improved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to an injection device. Background Technology

[0002] For injection devices with Luer locking connectors, market demand is increasing due to their suitability for filling and using viscous liquids. Currently, the sterilization method for injection devices with Luer locking connectors is usually ethylene oxide sterilization. However, because the interlocking surfaces at the Luer locking connector are typically quite tight, it hinders the entry and exit of ethylene oxide during sterilization, thus posing a significant challenge to product sterilization.

[0003] Therefore, how to provide an injection device that is easy to sterilize is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide an injection device that can effectively solve the problem that Luer locking connectors are not easy to sterilize.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] An injection device, comprising:

[0007] A syringe assembly, comprising a syringe and a locking cylinder, the locking cylinder being disposed at one end of the syringe, the inner surface of the locking cylinder being provided with an internal thread, and the side wall of the locking cylinder being provided with a first channel communicating with its interior.

[0008] The protective cap has an external thread at one end that mates with the internal thread of the lock cylinder, and the outer side of the top tooth of the external thread has a spiral groove.

[0009] Preferably, one end of the syringe is provided with a cone tip, the locking cylinder is located outside the cone tip, the locking cylinder and the cone tip are coaxial, the end of the cap with the external thread has a conical cavity inside, and a sealing ring is provided between the inner surface of the conical cavity or the outer surface of the cone tip or between the conical cavity and the outer surface of the cone tip.

[0010] Preferably, a plurality of sealing rings are provided on the inner surface of the conical cavity or the outer surface of the cone head or between the outer surfaces of the conical cavity and the cone head, and the plurality of sealing rings are distributed along the axial direction of the conical cavity.

[0011] Preferably, the sidewall of the lock cylinder is provided with a plurality of first channels distributed along its circumference.

[0012] Preferably, the length direction of the first channel is distributed along the axial direction of the lock cylinder.

[0013] Preferably, a second channel is provided on the side wall of the opening end of the conical cavity, and the second channel connects the interior and exterior of the conical cavity.

[0014] Preferably, the sidewall of the opening end of the conical cavity is provided with a plurality of second channels distributed along its circumference.

[0015] Preferably, the protective cap has a cavity inside the end away from the lock cylinder, and a support body is provided inside the cavity.

[0016] Preferably, the cavity is a cylindrical cavity, the support is a cylindrical shell, the inner side of the cylindrical shell is provided with reinforcing ribs, and the side wall of the cylindrical shell is provided with at least one through hole.

[0017] Preferably, the inner top of the conical cavity is provided with a sealing plug extending toward the inside of the cone.

[0018] Compared with existing technologies, the above technical solution has the following advantages:

[0019] This application provides an injection device comprising: a syringe assembly and a protective cap. The syringe assembly includes a syringe and a locking cylinder. The locking cylinder is located at one end of the syringe, and its inner surface has an internal thread. A first channel communicating with the interior of the locking cylinder is provided on its side wall. One end of the protective cap has an external thread that mates with the internal thread of the locking cylinder. A helical groove is provided on the outer side of the crest of the external thread. During sterilization, ethylene oxide gas passes through the first channel and then through the helical groove to reach the junction of the crest and root of the threaded teeth, thereby improving the sterilization effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an injection device provided for one specific embodiment of this application;

[0022] Figure 2 This is a side view of an injection device provided in a specific embodiment of the present application;

[0023] Figure 3 for Figure 2 A sectional view along line AA in the middle;

[0024] Figure 4 This is a side view of the syringe assembly.

[0025] Figure 5 for Figure 4 A sectional view along the BB direction in the middle;

[0026] Figure 6 for Figure 5 A cross-sectional view along the CC direction in the middle;

[0027] Figure 7 This is a schematic diagram of the structure of a protective cap;

[0028] Figure 8 This is a side view of the protective cap.

[0029] Figure 9 for Figure 8 A sectional view along the DD direction.

[0030] The attached figures are labeled as follows:

[0031] 1 is the syringe assembly, 1-1 is the syringe, and 1-2 is the cone tip;

[0032] 2 is the protective cap, 2-1 is the conical cavity, 2-1-1 is the sealing ring, 2-2 is the external thread, 2-2-1 is the tooth crest, 2-2-2 is the spiral groove, 2-3 is the tooth root, 2-4 is the sealing plug, 2-5 is the pit, 2-6 is the annular surface, 2-7 is the cavity, 2-8 is the first cylindrical boss, 2-9 is the annular inner wall, 2-10 is the anti-slip texture, and 2-11 is the second channel;

[0033] 3 is the support body, 3-1 is the through hole, 3-2 is the second cylindrical boss, 3-3 is the air passage, and 3-4 is the reinforcing rib.

[0034] 4 represents the lock cylinder, 4-1 represents the internal thread, and 4-2 represents the first channel. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0036] Specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] Please refer to Figures 1-9 .

[0038] One specific embodiment of this application provides an injection device, including: a syringe assembly 1 and a protective cap 2, wherein the syringe assembly 1 includes a syringe 1-1 and a locking cylinder 4, the locking cylinder 4 is disposed at one end of the syringe 1-1, the inner side of the locking cylinder 4 is provided with an internal thread 4-1, and the side wall of the locking cylinder 4 is provided with a first channel 4-2 communicating with its interior. Multiple first channels 4-2 can be provided on the side wall of the locking cylinder 4 distributed along its circumferential direction. The length direction of the first channels 4-2 is preferably distributed along the axial direction of the locking cylinder 4. For example, the shape of the first channel 4-2 is preferably an oblong hole. Multiple first channels 4-2 are preferably evenly distributed along the circumferential direction of the locking cylinder 4. The included angle of the projection of the internal thread 4-1 in the axial direction can be 30 to 150°, or less than 30° or greater than 150°. The number of first channels 4-2 can be selected according to actual needs. The cap 2 is used to seal the syringe 1-1. One end of the cap 2 has an external thread 2-2 that mates with the internal thread 4-1 of the locking cylinder 4. The outer side of the crest of the external thread 2-2 has a helical groove 2-2-2, which extends between adjacent root teeth 2-3 of the external thread 2-2. The number of helical grooves 2-2-2 can be one or more. The cap 2 is preferably made of rubber, and the locking cylinder 4 is preferably made of plastic. During sterilization, ethylene oxide gas passes through the first channel 4-2 and then through the helical groove 2-2-2 to reach the junction of the crest 2-2-1 and root teeth 2-3 of the threaded connection, thereby improving the sterilization effect.

[0039] In some embodiments of this application, one end of the syringe 1-1 is provided with a cone 1-2, and the locking cylinder 4 is located outside the cone 1-2. The locking cylinder 4 and the cone 1-2 are coaxial. The inner top of the conical cavity 2-1 is provided with a sealing plug 2-4 extending toward the cone 1-2. The sealing plug 2-4 and the inner wall of the conical cavity 2-1 form an annular surface 2-6. The sealing plug 2-4 can seal the cone 1-2. The end of the cap 2 with the external thread 2-2 is provided with a conical cavity 2-1. The inner surface of the conical cavity 2-1 is provided with a sealing ring 2-1-1. The inner diameter of the sealing ring 2-1-1 is smaller than the inner diameter of the conical cavity 2-1. The sealing ring 2-1-1 can be integrally formed in the conical cavity 2-1, or the outer surface of the cone 1-2 is provided with a sealing ring 2-1-1, or the outer surface of the conical cavity 2-1 and the outer surface of the cone 1-2 are provided with a sealing ring 2-1-1. Multiple sealing rings 2-1-1 are provided on the inner surface of the conical cavity 2-1, the outer surface of the conical head 1-2, or between the outer surfaces of the conical cavity 2-1 and the conical head 1-2. These sealing rings 2-1-1 are distributed axially along the conical cavity, preferably at equal intervals. The inner diameter of the sealing rings 2-1-1 at different positions varies, gradually increasing from the closed end to the open end. The specific number of sealing rings 2-1-1 can be selected according to specific circumstances; this embodiment does not impose a specific limitation. The sealing rings transform the original surface-to-surface contact into a line-to-surface contact, ensuring airtightness while facilitating the penetration of ethylene oxide gas, thereby improving the sterilization effect. The conical cavity 2-1 has a second channel 2-11 on the side wall of the opening end. The second channel 2-11 connects the inside and outside of the conical cavity 2-1. Ethylene oxide gas can flow into the conical cavity 2-1 through the second channel 2-11. The number of second channels 2-11 is preferably multiple. The multiple second channels 2-11 are distributed along their circumference, preferably evenly distributed.

[0040] In some embodiments of this application, the end of the cap 2 furthest from the lock cylinder 4 has a cavity 2-7 inside, and a support body 3 is provided inside the cavity 2-7. The support body 3 is preferably made of plastic, and the support body 3 can improve the strength of the cap 2. The outer side of the cap 2 has anti-slip textures 2-10, which can extend along the axial direction of the cap 2, and multiple anti-slip textures 2-10 are evenly distributed along the circumference of the cap 2. The cavity 2-7 is preferably a cylindrical cavity, and the support body 3 is correspondingly a cylindrical shell. The inner side of the cylindrical shell has reinforcing ribs 3-4, preferably multiple reinforcing ribs 3-4, which are preferably evenly distributed along the inner side of the cylindrical shell. The length direction of the reinforcing ribs 3-4 extends along the axial direction of the cylindrical shell, and the side wall of the cylindrical shell has at least one through hole 3-1. The cylindrical cavity has an open end and a closed end. The open end has a first cylindrical boss 2-8 extending radially inward. An annular inner wall 2-9 is provided between the cylindrical inner cavity and the first cylindrical boss 2-8. The closed end of the cylindrical inner cavity has a recess 2-5 that is recessed towards the cone head 1-2. The cylindrical shell has an open end and a second cylindrical boss 3-2 that tapers inward at the other end. The end of the second cylindrical boss 3-2 is closed. The closed end has an air passage 3-3 that penetrates the cylindrical shell. The air passage 3-3 can extend radially, and multiple air passages 3-3 can be provided evenly distributed along the circumference.

[0041] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection device, characterized in that, include: A syringe assembly includes a syringe and a locking cylinder. The locking cylinder is disposed at one end of the syringe. The inner surface of the locking cylinder is provided with an internal thread. The side wall of the locking cylinder is provided with a first channel communicating with its interior. The side wall of the locking cylinder is provided with a plurality of the first channels distributed along its circumference. The length direction of the first channels is distributed along the axial direction of the locking cylinder. The protective cap has an external thread at one end that mates with the internal thread of the lock cylinder. The outer side of the top tooth of the external thread has a helical groove that extends between two adjacent tooth roots of the external thread.

2. The injection device according to claim 1, characterized in that, One end of the syringe is provided with a cone tip, and the locking cylinder is located outside the cone tip. The locking cylinder and the cone tip are coaxial. The end of the cap with the external thread has a conical cavity inside. A sealing ring is provided between the inner surface of the conical cavity, the outer surface of the cone tip, or the outer surface of the conical cavity and the outer surface of the cone tip.

3. The injection device according to claim 2, characterized in that, Multiple sealing rings are provided on the inner surface of the conical cavity, the outer surface of the cone head, or between the outer surfaces of the conical cavity and the cone head, and the multiple sealing rings are distributed along the axial direction of the conical cavity.

4. The injection device according to claim 2, characterized in that, A second channel is provided on the side wall of the opening end of the conical cavity, and the second channel connects the interior and exterior of the conical cavity.

5. The injection device according to claim 4, characterized in that, The conical cavity has multiple second channels distributed along its circumference on the side wall of the opening end.

6. The injection device according to claim 1, characterized in that, The protective cap has a cavity inside the end away from the lock cylinder, and a support body is provided inside the cavity.

7. The injection device according to claim 6, characterized in that, The cavity is a cylindrical cavity, the support is a cylindrical shell, the inner side of the cylindrical shell is provided with reinforcing ribs, and the side wall of the cylindrical shell is provided with at least one through hole.

8. The injection device according to claim 2, characterized in that, The inner top of the conical cavity is provided with a sealing plug extending toward the inside of the cone.

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