Double-chamber injector assembly and automatic injection pen

Abstract

The utility model relates to the technical field of medical instruments, and discloses a double-chamber injector assembly and an automatic injection pen, the double-chamber injector assembly comprises an injection needle cylinder, a middle plug and a rear plug, one end of the injection needle cylinder is open, and the other end of the injection needle cylinder is provided with an injection needle head communicated with the inside of the injection needle cylinder; the peripheral side of the middle plug movably abuts against the inner wall of the injection needle, a front cavity is formed between the middle plug and the injection needle, the inner wall of the injection needle cylinder is provided with a liquid injection channel communicated with the injection needle, the length of the liquid injection channel is larger than that of the middle plug, the peripheral side of the rear plug movably abuts against the inner wall of the injection needle, and a rear cavity is formed between the rear plug and the middle plug. The liquid injection channel is formed in the inner wall of the injection needle cylinder, the liquid injection channel is communicated with the rear cavity, second liquid medicine in the rear cavity is injected out together until the rear plug abuts against the end face of the middle plug, one-time injection administration of two kinds of incompatible liquid medicine can be completed only through one-time injection, clinical operation is convenient and fast, and the pollution risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a double-chamber syringe component and an automatic injection pen. Background Art

[0002] At present, most syringes are prefilled syringes with a single-chamber structure. When two drug solutions are administered sequentially, two injections are required, which makes the clinical operation cumbersome and faces the risk of double contamination.

[0003] In addition, the prefilled syringe with a double-chamber structure used to store lyophilized powder and reconstitution solvent is only suitable for the reconstitution and injection of lyophilized powder injections, and cannot meet the requirements of one-time injection administration of two incompatible drug solutions.

[0004] Therefore, it is urgent to design a new dual-chamber syringe assembly and automatic injection pen to improve the above problems. Utility Model Content

[0005] The utility model aims to provide a double-chamber syringe assembly to solve the technical problem that the prior art cannot achieve one-time injection and complete one-time injection administration of two incompatible drug solutions.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Dual chamber syringe assembly, comprising:

[0008] An injection syringe, one end of which is open and the other end of which is provided with an injection needle connected to the interior thereof;

[0009] a middle plug, the peripheral side of which is in active contact with the inner wall of the injection needle, a front cavity for accommodating a first liquid medicine is provided between the middle plug and the injection needle, an injection channel communicating with the injection needle is provided on the inner wall of the injection syringe, the injection channel extends along the axial direction of the injection syringe, and the length of the injection channel in the barrel of the injection syringe is greater than the length of the middle plug; and

[0010] A rear plug, the peripheral side of which is in active contact with the inner wall of the injection needle, and a rear cavity for accommodating a second medicinal solution is provided between the rear plug and the middle plug.

[0011] As a preferred solution of the dual-chamber syringe assembly, the front chamber is connected to the injection needle in a conical shape, and the diameter gradually decreases.

[0012] As a preferred embodiment of the dual-chamber syringe assembly, the length of the injection channel in the syringe barrel is a, the length of the middle plug is b, the length of the rear plug is d, and the following formula is satisfied: b<a<b+d.

[0013] As a preferred solution of the dual-chamber syringe assembly, a protrusion is provided on the circumference of the injection syringe, and the injection channel is provided on the protrusion.

[0014] As a preferred solution of the dual-chamber syringe assembly, the end surface of the rear plug facing away from the middle plug is provided with a pusher;

[0015] Alternatively, when the dual-chamber syringe assembly is assembled in an automatic injection pen, a push rod for activating the automatic injection pen acts on the end surface of the rear plug facing away from the middle plug.

[0016] As a preferred solution of the dual-chamber syringe assembly, both end surfaces of the middle plug and the rear plug are planes.

[0017] As a preferred solution of the dual-chamber syringe assembly, the middle plug and the rear plug are both made of rubber material.

[0018] As a preferred solution of the dual-chamber syringe assembly, sealing rings are provided on the circumference of the middle plug and the rear plug, and multiple sealing rings are provided, and the multiple sealing rings are spaced apart along the axial direction of the middle plug or the rear plug.

[0019] As a preferred solution of the dual-chamber syringe assembly, the diameter of the sealing ring of the middle plug and the rear plug is larger than the inner diameter of the injection syringe.

[0020] An automatic injection pen comprises a housing and the above-mentioned double-chamber syringe assembly arranged in the housing.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a double-chamber syringe assembly, which, by setting a middle plug, accommodates the first liquid medicine in the front cavity formed between the injection needle and the middle plug; and then sets a rear plug, accommodates the second liquid medicine in the rear cavity formed between the middle plug and the rear plug; when stimulated, the rear plug and the middle plug move toward the injection needle at the same time, and the first liquid medicine in the front cavity will be injected first, until the middle plug is pushed to the injection syringe near the injection needle and cannot move further, the injection channel is connected with the rear cavity, and the first liquid medicine remaining in the front cavity will be injected together with the second liquid medicine in the rear cavity until the rear plug abuts against the end face of the middle plug, so that only one injection can be used to complete the one-time injection of two incompatible liquid medicines, which is convenient for clinical operation and reduces the risk of contamination. In addition, the design does not need to change the size of the injection channel according to the different filling amounts of the liquid medicine, thereby saving mold opening costs.

[0023] The utility model provides an automatic injection pen, which makes the entire injection process more convenient, faster and more controllable by installing the above-mentioned double-chamber syringe assembly into the housing of the automatic injection pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a front view of an uninjected dual-chamber syringe assembly provided by an embodiment of the utility model;

[0025] Figure 2 is a front view of a dual-chamber syringe assembly for completing an injection provided by an embodiment of the utility model;

[0026] Figure 3 is a side view of an uninjected dual-chamber syringe assembly provided by an embodiment of the utility model;

[0027] Figure 4 It is a side view of a dual-chamber syringe assembly for completing an injection provided by an embodiment of the utility model.

[0028] In the figure:

[0029] 1. Injection syringe; 11. Front cavity; 12. Back cavity; 13. Protrusion; 14. Injection channel; 2. Injection needle; 3. Middle plug; 4. Back plug; 5. Sealing ring. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] At present, most syringes are prefilled syringes with a single-chamber structure. When two drug solutions are administered sequentially, two injections are required, which is cumbersome in clinical operation and faces the risk of double contamination. In addition, the prefilled syringes with a double-chamber structure used to store lyophilized powder and reconstitution solvent are only suitable for the reconstitution and injection of lyophilized powder injections, and cannot meet the requirements of one-time injection administration of two incompatible drug solutions.

[0035] In order to solve the above problems, combined Figure 1 and Figure 2 As shown, this embodiment provides a double-chamber syringe assembly, which includes a syringe barrel 1, a middle plug 3 and a rear plug 4. One end of the syringe barrel 1 is open, and the other end of the syringe barrel 1 is provided with a syringe needle 2 connected to the inside thereof, the peripheral side of the middle plug 3 is movably in contact with the inner wall of the syringe needle 2, and a front cavity 11 for accommodating a first liquid medicine is provided between the middle plug 3 and the syringe needle 2, and an injection channel 14 connected to the injection needle 2 is provided on the inner wall of the syringe barrel 1, and the injection channel 14 extends along the axial direction of the syringe barrel 1, and the length of the injection channel 14 in the barrel portion of the syringe barrel is greater than that of the middle plug 3, the peripheral side of the rear plug 4 is movably in contact with the inner wall of the syringe needle 2, and a rear cavity 12 for accommodating a second liquid medicine is provided between the rear plug 4 and the middle plug 3.

[0036] It can be understood that by setting the middle plug 3, the first liquid medicine is placed in the front cavity 11 formed between the injection needle 2 and the middle plug 3; and then the rear plug 4 is set to place the second liquid medicine in the rear cavity 12 formed between the middle plug 3 and the rear plug 4. After being stimulated, the rear plug 4 and the middle plug 3 move toward the injection needle 2 at the same time, and the first liquid medicine in the front cavity 11 will be injected first, until the middle plug 3 is pushed to the injection syringe 1 near the injection needle 2 and cannot move further, the injection channel 14 is connected with the rear cavity 12, and the first liquid medicine remaining in the front cavity 11 will be injected together with the second liquid medicine in the rear cavity 12, until the rear plug 4 abuts against the end surface of the middle plug 3, and the injection of the second liquid medicine is completed. In this way, two incompatible liquid medicines can be injected once with only one injection, which is convenient for clinical operation and reduces the risk of contamination.

[0037] Furthermore, this design does not require changing the size of the injection channel 14 according to the different filling volumes of the liquid medicine, thereby saving mold opening costs.

[0038] Preferably, if Figure 1 and Figure 3 As shown, the diameter of the front cavity 11 of the injection syringe 1 near the injection needle 2 gradually decreases toward the diameter of the injection needle 2, and the two are connected in a cone, that is, a conical head of the injection syringe 1 is formed. The conical head design of the injection syringe 1 ensures that when the middle plug 3 is pushed to the end of the injection syringe 1 and cannot move further, there is still space between the end surface of the middle plug 3 and the injection needle 2, so that the middle plug 3 does not block the injection port of the injection needle 2, ensuring the smooth flow of the injection channel 14, so that the subsequent second liquid medicine can continue to be injected from the injection needle 2 through the injection channel 14.

[0039] Furthermore, the length of the injection channel 1 at the injection syringe barrel 4 in the non-injection state is defined as a, the length of the middle plug 3 is defined as b, and the length of the rear plug 4 is defined as d, and the following formula is satisfied: b<a<b+d. It should be noted that when the rear plug 4 and the middle plug 3 move at the same time, the first liquid medicine in the front chamber 11 is first pushed into the injection needle 2 and injected. When the middle plug 3 cannot move toward the end face of the injection needle 2, the end face of the middle plug 3 facing away from the injection needle 2 is located at the injection channel 14, so that the injection channel 14 is connected to the rear chamber 12. The structure is simple and the design is ingenious. The double-chamber structure of the front chamber 11 and the rear chamber 12 is used. The front chamber 11 stores the first liquid medicine, and the rear chamber 12 stores the second liquid medicine. After being pre-filled, they are separated and stored, and there is no need to separate the two injections, which greatly improves the convenience of clinical operation.

[0040] Preferably, the injection channel 14 can be connected to the injection needle 2, the length of the injection channel 14 exceeds the length of the middle plug 3 in the axial direction, and the depth of the injection channel 14 is greater than the inner diameter of the injection needle 2, so as to ensure that the first and second liquid medicines can be completely injected. Furthermore, to ensure that all the liquid medicines can be injected, at least the end faces of the middle plug 3 and the rear plug 4 that are close to each other are planes, and both end faces of the middle plug 3 and the rear plug 4 in this embodiment are planes. In other embodiments, the end of the middle plug 3 close to the injection needle 2 can also be set to be conical to ensure that the injection needle 2 is not blocked, and this embodiment does not specifically limit this.

[0041] Specifically, a protrusion 13 is provided on the circumference of the injection syringe 1, and the injection channel 14 is provided on the protrusion 13. The provision of the protrusion 13 makes the wall thickness of each part of the injection syringe 1 consistent, and the structural strength is better.

[0042] Optionally, the middle plug 3 and the rear plug 4 of this embodiment are both made of rubber material, which has the advantages of corrosion resistance and good waterproof sealing, and can be in contact with the drug solution, and keep the middle plug 3 and the rear plug 4 sealed and connected with the inner wall of the injection syringe 1 during the push injection process. Among them, the peripheral sides of the middle plug 3 and the rear plug 4 are integrally formed with a sealing ring 5, and a plurality of sealing rings 5 ​​are provided. The plurality of sealing rings 5 ​​are arranged at intervals along the axial direction of the middle plug 3 or the rear plug 4. The diameter of the sealing ring 5 of the middle plug 3 and the rear plug 4 is larger than the inner diameter of the injection syringe 1. After extrusion, the sealing ring 5 is interference fit with the injection syringe 1, ensuring that the first drug solution in the front cavity 11 and the second drug solution in the rear cavity 12 will not mix, thereby reducing the risk of drug mixing.

[0043] Optionally, a pushing member (not shown in the figure) is provided on the end surface of the rear plug 4 facing away from the middle plug 3, and the pushing member is a push rod, one end of which is connected to the rear plug 4, and the other end of the push rod extends out of the open end of the injection syringe 1. The operator can inject the drug by pushing the push rod by hand, or by using other mechanisms for push injection, which is not specifically limited in this embodiment.

[0044] Now combined Figure 1-Figure 4 The injection process of the dual chamber syringe assembly is further described in detail:

[0045] First, after being triggered, the rear plug 4 and the middle plug 3 move toward the injection needle 2 at the same time, and the first liquid medicine in the front cavity 11 is injected first;

[0046] Secondly, when the middle plug 3 abuts against the end of the injection syringe 1 and cannot move further, the rear cavity 12 is connected with the injection channel 14;

[0047] Furthermore, the rear plug 4 is pushed to continue moving toward the injection needle 2, and the second liquid medicine in the rear cavity 12 is injected from the injection needle 2 through the injection channel 14;

[0048] Finally, the rear plug 4 abuts against the middle plug 3 and is pushed to the bottom, thereby completing the injection of the two drug solutions in one injection.

[0049] In summary, compared with the prior art, the present application designs the existing single-chamber syringe assembly into a dual-chamber syringe assembly, which can meet the needs of administering two liquid drugs at a time, avoiding the risk of secondary contamination, and can significantly reduce the mixing amount and time of two different liquid medicines, and reduce the risk of quality problems caused by incompatibility of different liquid medicines. In addition, when producing the dual-chamber syringe assembly, two different liquid medicines can be placed in the same syringe during production, greatly reducing the production and storage costs of the medicines.

[0050] In addition, the present embodiment further provides an automatic injection pen, which includes a housing and the above-mentioned dual-chamber syringe assembly disposed in the housing, the open end of the injection syringe 1 is provided with a flange, the housing is connected to the flange, and the pusher in the housing abuts against the rear plug 4. By installing the above-mentioned dual-chamber syringe assembly into the housing of the automatic injection pen, the function and application scope of the automatic injection pen are significantly improved, providing users with a more flexible and efficient use experience, not only broadening the application field of the syringe, but also realizing more accurate and controllable drug management during the injection process, providing patients with more convenient and personalized treatment options.

[0051] It should be noted that, in order to cooperate with the automatic injection pen, no pushing member is provided on the end face of the rear plug 4 facing away from the middle plug 3. When the dual-chamber syringe assembly is assembled in the automatic injection pen, the push rod of the automatic injection pen will act on the end face of the rear plug 4 facing away from the middle plug 3, and the push rod of the automatic injection pen will serve as the pushing force for the rear plug 4 and the middle plug 3.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A dual-chamber syringe assembly, characterized in that: include: An injection syringe (1), wherein one end of the injection syringe (1) is open and the other end is provided with an injection needle (2) connected to the interior thereof; a middle plug (3), the peripheral side of the middle plug (3) being in active contact with the inner wall of the injection needle (2), a front cavity (11) for accommodating a first liquid medicine being provided between the middle plug (3) and the injection needle (2), the inner wall of the injection syringe (1) being provided with an injection channel (14) communicating with the injection needle (2), the injection channel (14) extending along the axial direction of the injection syringe (1), the length of the injection channel (14) in the barrel portion of the injection syringe (1) being greater than the length of the middle plug (3); and A rear plug (4), the peripheral side of which is in active contact with the inner wall of the injection needle (2), and a rear cavity (12) for accommodating a second drug solution is provided between the rear plug (4) and the middle plug (3).

2. The dual chamber syringe assembly according to claim 1, characterized in that The front cavity (11) is connected to the injection needle (2) in a conical shape, and the diameter gradually decreases.

3. The dual chamber syringe assembly according to claim 1, characterized in that The length of the injection channel (14) in the body of the injection syringe (1) is a, the length of the middle plug (3) is b, and the length of the rear plug (4) is d, and the following formula is satisfied: b<a<b+d.

4. The dual chamber syringe assembly according to claim 1, characterized in that: A protrusion (13) is provided on the circumferential side of the injection syringe (1), and the injection channel (14) is provided on the protrusion (13).

5. The dual chamber syringe assembly according to claim 1, characterized in that: The end surface of the rear plug (4) facing away from the middle plug (3) is provided with a pushing member; Alternatively, when the dual-chamber syringe assembly is assembled in an automatic injection pen, the push rod for activating the automatic injection pen will act on the end surface of the rear plug (4) facing away from the middle plug (3).

6. The dual-chamber syringe assembly according to any one of claims 1 to 5, characterized in that: Both end surfaces of the middle plug (3) and the rear plug (4) are planes.

7. The dual-chamber syringe assembly according to any one of claims 1 to 5, characterized in that: The middle plug (3) and the rear plug (4) are both made of rubber material.

8. The dual chamber syringe assembly according to claim 7, characterized in that The central plug (3) and the rear plug (4) are both provided with sealing rings (5) on their circumferential sides. A plurality of the sealing rings (5) are provided, and the plurality of sealing rings (5) are arranged at intervals along the axial direction of the central plug (3) or the rear plug (4).

9. The dual chamber syringe assembly according to claim 8, characterized in that The diameter of the sealing ring (5) of the middle plug (3) and the rear plug (4) is larger than the inner diameter of the injection syringe (1).

10. An automatic injection pen, characterized in that The invention comprises a housing and the dual-chamber syringe assembly according to any one of claims 1 to 9 arranged in the housing.

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