Sealed pre-filled syringe

Abstract

The utility model belongs to the technical field of medicine filling and sealing, and particularly discloses a sealing pre-filling and sealing injector which comprises a sealing cap, a needle cylinder, a piston and a push rod, the piston is connected with the push rod, the piston is located in the needle cylinder, the sealing cap is in threaded connection with the needle cylinder, and when the sealing cap is screwed into the needle cylinder in a threaded mode and the needle cylinder is in threaded connection, the sealing cap is sealed. And the sealing cap and the needle cylinder can be clamped with each other. According to the utility model, the sealing performance can be improved, and liquid leakage can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medicine filling, in particular to a sealed pre-filled syringe. Background Art

[0002] Prefilled syringes are mainly used for packaging and storage of high-end drugs and are directly used for injection or for flushing in ophthalmology, otology, orthopedics and other surgeries. Prefilled syringes have both the functions of storing drugs and ordinary injections, and are made of materials with good compatibility and stability. They are not only safe and reliable, but also compared with the traditional "medicine bottle + syringe" method, they minimize the labor and cost consumed from production to use, bringing many advantages to pharmaceutical companies and clinical use.

[0003] Traditional prefilled syringes are mostly packaged by tightening the cap and the plastic syringe thread. This method may cause the cap to loosen during production and transportation, leading to safety hazards such as drug leakage and contamination. Utility Model Content

[0004] The utility model provides a sealed pre-filled syringe, which aims to improve the sealing performance and avoid liquid leakage.

[0005] The utility model is realized through the following technical scheme: a sealed prefilled syringe, comprising a sealing cap, a syringe, a piston and a push rod, wherein the piston is connected to the push rod, the piston is located in the syringe, the sealing cap is threadedly connected to the syringe, and when the sealing cap is threadedly screwed into the syringe and the threaded connection with the syringe is completed, the sealing cap and the syringe can be engaged with each other.

[0006] Compared with the prior art, the utility model has the following advantages and beneficial effects: in the present solution, the sealing cap and the syringe are threadedly connected, and the stability of the connection between the sealing cap and the syringe is enhanced by the clamping structure of the sealing cap and the syringe, so that a double connection and limiting relationship is formed between the sealing cap and the syringe, which can enhance the sealing performance after the sealing cap and the syringe are connected, and during sterilization expansion, it can be ensured that the sealing cap and the syringe will not move left and right (the left and right in the utility model refers to the axial direction of the sealing cap and the syringe), thereby preventing the sealing cap from spirally retreating, and further ensuring that the product does not leak.

[0007] Furthermore, the sealing cap includes a cap body and a connecting head, the connecting head is communicated with the cap body, an outer side of the connecting head is provided with an external thread, one end of the syringe is connected to a connecting cylinder, the connecting cylinder includes an outer cylinder and an inner cylinder arranged coaxially, the inner cylinder is communicated with the syringe, an inner side of the outer cylinder is provided with an internal thread, and the connecting head can be inserted between the inner cylinder and the outer cylinder and cooperate with the outer cylinder thread.

[0008] Beneficial effect: In this solution, the sealing cap achieves the sealing effect on the end of the syringe through the cooperation between the connecting head and the outer cylinder thread.

[0009] Furthermore, a groove is provided at the end of the connector, and a latch is provided between the inner tube and the outer tube and at one end close to the syringe, and after the connector is screwed into the outer tube, the groove can be engaged with the latch.

[0010] Beneficial effect: In this solution, a groove is provided at the end of the connector, and latch teeth are provided at corresponding positions between the inner tube and the outer tube. When the connector and the outer tube threads are twisted to corresponding positions, the latch teeth and the groove engage with each other, thereby improving the tightness of the fit between the connector and the connector tube and improving the sealing of the connection between the sealing cap and the syringe.

[0011] Furthermore, a latching tooth is connected to the end of the connector, and a groove is provided between the inner tube and the outer tube and on one side close to the syringe. After the connector is screwed into the outer tube, the groove can engage with the latching tooth.

[0012] Beneficial effect: This scheme adopts another method, in which the groove is set in the connecting tube at the end of the syringe, and the latch tooth is set at the end of the connecting head. In actual use, the connecting head is screwed into the connecting tube through the thread, which is beneficial to the cooperation between the latch tooth and the groove to limit the connection between the sealing cap and the syringe, thereby improving the sealing between the sealing cap and the syringe and preventing the sealing cap and the syringe from moving relative to each other and affecting the sealing.

[0013] Furthermore, two of the latch teeth and two of the grooves are provided, and the two latch teeth and the two grooves are symmetrically distributed.

[0014] Beneficial effect: In this solution, two latch teeth and two grooves are provided, and the cooperation of the two latch teeth and the two grooves can further enhance the restriction between the sealing cap and the syringe, further improve the tightness of the connection between the sealing cap and the syringe, and the two are less likely to loosen.

[0015] Furthermore, the latch tooth is in the shape of a triangular prism, and the groove is a V-shaped groove.

[0016] Beneficial effect: The shapes of the latch teeth and the grooves in this solution can improve the stability of the engagement between the latch teeth and the grooves, and the latch teeth and the grooves are not prone to slipping.

[0017] Furthermore, a latching tooth is provided on the thread crest of the connector, a groove is provided on the inner side of the outer tube, the outer tube has elastic deformation, and the latching tooth can be inserted into the groove.

[0018] Beneficial effect: This scheme adopts another locking method. This scheme arranges a locking tooth on the thread top of the connecting head and opens a groove on the inner side of the outer tube. In this way, when the connecting head thread is screwed into the gap between the outer tube and the inner tube, the locking tooth can be stuck in the groove. Since the outer tube has elastic deformation, the locking tooth arranged on the thread top of the connecting head can normally enter the gap between the outer tube and the inner tube.

[0019] Furthermore, both sides of the groove are inclined surfaces, and both sides of the latching tooth are provided with inclined surfaces matching the groove.

[0020] Beneficial effect: Such a setting can make the latching tooth snap into the groove more smoothly, and the setting of the inclined surface can guide the latching tooth to snap into the groove.

[0021] Furthermore, a latching tooth is provided on the thread crest of the connector, a groove is provided on the inner side of the outer tube, the outer tube has elastic deformation, and the latching tooth on the thread crest of the connector can be inserted into the groove on the inner side of the outer tube.

[0022] Beneficial effect: In this solution, the technical solution of setting a latch on the threaded top of the connecting head and a groove on the inner side of the outer tube is combined with the technical solution of setting a latch or a groove at the end of the connecting head and setting a groove or a latch at the corresponding position between the outer tube and the inner tube. This can further enhance the limiting matching relationship between the connecting head and the connecting tube, thereby improving the sealing between the sealing cap and the syringe, avoiding looseness between the sealing cap and the syringe, and further ensuring that the product will not leak.

[0023] Furthermore, the outer side of the cap body is provided with anti-slip grooves.

[0024] Beneficial effect: The anti-slip pattern can prevent the cap from slipping when the cap is manually twisted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0026] Figure 1 It is a partial cross-sectional view of Example 1 of a sealed prefilled syringe of the utility model;

[0027] Figure 2 This is an assembly diagram of a sealing cap and a syringe in Example 1 of a sealed prefilled syringe of the utility model;

[0028] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0029] Figure 4 It is a partial cross-sectional view of Example 2 of a sealed prefilled syringe of the utility model;

[0030] Figure 5 This is an assembly diagram of a sealing cap and a syringe in Example 2 of a sealed prefilled syringe of the utility model;

[0031] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0032] Figure 7 It is a partial cross-sectional view of Example 3 of a sealed prefilled syringe of the utility model;

[0033] Figure 8 It is a longitudinal cross-sectional view of Example 3 of a sealed prefilled syringe of the utility model;

[0034] Fig. 9 for Figure 8 Cross-sectional view at CC.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] Sealing cap 1, cap body 101, connector 102, syringe 2, outer cylinder 201, inner cylinder 202, groove 3, clamping plate 301, and clamping teeth 4. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0038] Example 1

[0039] like Figure 1-Figure 3 As shown, this embodiment 1 provides a sealed prefilled syringe, including a sealing cap 1, a syringe 2, a piston and a push rod, the piston is connected to the push rod, the piston is located in the syringe 2, the sealing cap 1 is threadedly connected to the syringe 2, and when the sealing cap 1 is threaded into the syringe 2 and the threaded connection with the syringe 2 is completed, the sealing cap 1 and the syringe 2 can be engaged with each other, that is, when the sealing cap 1 is screwed to the corresponding position, the sealing cap 1 and the syringe 2 can be engaged, so that the sealing cap 1 and the syringe 2 can be double-connected by threaded connection and engaging connection, and the tightness of the connection between the sealing cap 1 and the syringe 2 can be improved, and the mutual engagement between the sealing cap 1 and the syringe 2 can avoid looseness between the sealing cap 1 and the syringe 2, which may cause the product to leak due to poor sealing as the threaded seat spirally retreats backwards.

[0040] The closure cap 1 includes a cap body 101 and a connector 102, the connector 102 and the cap body 101 are connected to each other, and the connector 102 and the cap body 101 are integrally formed, the outer side of the cap body 101 is provided with a protective pattern, and the outer side of the connector 102 is provided with an external thread. One end of the syringe 2 is connected with a connecting cylinder, in this embodiment, the connecting cylinder and the syringe 2 are integrally formed, and the connecting cylinder forms the Luer cone head at the end of the syringe 2. The connecting cylinder includes a coaxially arranged outer cylinder 201 and an inner cylinder 202, the inner cylinder 202 is connected to the syringe 2, and there is a gap between the outer cylinder 201 and the inner cylinder 202, one end of the outer cylinder 201 is connected to the end of the syringe 2, and the inner side of the outer cylinder 201 is provided with an internal thread, and the connector 102 can be inserted between the inner cylinder 202 and the outer cylinder 201 and is threadedly matched with the outer cylinder 201.

[0041] In this embodiment, a groove 3 is provided at the end of the connector 102, and a latch tooth 4 is provided between the inner tube 202 and the outer tube 201 and at one end close to the syringe 2. In this embodiment, the inner tube 202 and the end of the syringe 2 are connected by an arc transition, and the latch tooth 4 is arranged on the arc section of the inner tube 202. After the connector 102 is screwed into the outer tube 201, the groove 3 can engage with the latch tooth 4.

[0042] In this embodiment, there are two latch teeth 4 and two grooves 3, and the two latch teeth 4 and the two grooves 3 are symmetrically distributed. The latch teeth 4 are in the shape of triangular prisms, and the grooves 3 are V-shaped grooves. In this way, when the latch teeth 4 are inserted into the grooves 3, the limiting effect between the two is better.

[0043] The specific implementation process is as follows:

[0044] By twisting the cap body 101, the connector 102 is screwed into the connecting tube in cooperation with the inner thread of the outer tube 201. When the threads of the connector 102 and the outer tube 201 are twisted to corresponding positions, the latch teeth 4 and the grooves 3 engage with each other, so that a double connection seal of threaded connection and latching connection is formed between the sealing cap 1 as a whole and the syringe 2. When the sealing cap 1 expands during sterilization, it can ensure that the sealing cap 1 and the syringe 2 will not move left and right, thereby preventing the sealing cap 1 from spirally retreating and ensuring that the product does not leak.

[0045] Example 2

[0046] like Figure 4 , Figure 5 and Figure 6 As shown, the difference between this embodiment and embodiment 1 is that: in this embodiment, the end of the connecting head 102 is connected with a latch tooth 4, and a groove 3 is provided between the inner cylinder 202 and the outer cylinder 201 and on the side close to the syringe 2, and the groove 3 is located on the arc segment of the inner cylinder 202. In this embodiment, an annular clamping plate 301 is connected to the arc end of the inner cylinder 202, and the outer contour of the clamping plate 301 also has an arc matching the inner cylinder 202. The groove 3 is provided on the clamping plate 301, and after the connecting head 102 is screwed into the outer cylinder 201, the groove 3 can engage with the latch tooth 4.

[0047] In this embodiment, there are also two latch teeth 4 and two grooves 3, which are symmetrically arranged, and the grooves 3 are all V-shaped grooves, and the latch teeth 4 are all triangular prisms. When the connecting head 102 and the outer tube 201 of the connecting tube are threadedly connected to a fixed position, the latch teeth 4 on the connecting head 102 are inserted into the grooves 3 of the clamping plate 301. During the process of screwing the connecting head 102, the clamping plate 301 can be inserted into the connecting head 102, and the latch teeth 4 on the connecting head 102 have a certain thickness and can be normally clamped on the grooves 3 of the clamping plate 301 without affecting the entry of the clamping plate 301 into the interior of the connecting head 102.

[0048] The positions of the latch teeth 4 and the groove 3 in this embodiment are opposite to those in Embodiment 1, both of which form a double limit and connection relationship between the sealing cap 1 and the syringe 2, thereby ensuring the sealing of the product and preventing the sealing cap 1 from spirally retreating.

[0049] Example 3

[0050] like Figure 7 , Figure 8 and Fig. 9 As shown, the difference between this embodiment and embodiment 1 is that: a latching tooth 4 is provided on the thread crest of the connector 102, a groove 3 is provided on the thread bottom of the inner side of the outer cylinder 201, the outer cylinder 201 has elastic deformation, and the latching tooth 4 can be inserted into the groove 3. In actual manufacturing, the latching tooth 4 is smaller and can be inserted into the outer cylinder 201 more smoothly, which is convenient for opening or screwing into the connector 102. The connector of this embodiment is made of plastic material, has certain plasticity, can be deformed and can be reset after deformation, so that the latching tooth 4 can enter the inner side of the outer cylinder 201.

[0051] In this embodiment, the latch tooth 4 is arranged on the thread top of the connector 102, and the groove 3 is arranged on the inner side of the outer tube 201. In this embodiment, another engaging method is provided, which changes the setting positions of the latch tooth 4 and the groove 3. The latch tooth 4 or the groove 3 is no longer arranged on the end face of the connector 102, but the latch tooth 4 is arranged on the thread top of the connector 102. Compared with the arrangement of the latch tooth 4 on the inner side of the outer tube 201, in this embodiment, the latch tooth 4 is arranged on the thread top of the connector 102, which is easier to manufacture and process.

[0052] Combination Fig. 9 As shown, both sides of the groove 3 are inclined surfaces, and both sides of the latching tooth 4 are provided with inclined surfaces matching the groove 3. The setting of the inclined surfaces has a guiding effect on the latching tooth 4 being inserted into the groove 3, so that the latching tooth 4 can be inserted into the groove 3 more easily.

[0053] In this embodiment, the threaded cooperation between the connector 102 and the outer tube 201 is utilized. When the connector 102 is rotated to the corresponding position to complete the threaded connection with the connector tube, the locking teeth 4 on the screw top of the connector 102 are inserted into the groove 3 at the bottom of the inner thread of the outer tube 201 to complete the engagement.

[0054] Example 4

[0055] The difference between this embodiment and the above-mentioned embodiments is that: in this embodiment, the technical solution of embodiment 3 is combined with the technical solution of embodiment 1 or embodiment 2, so that the thread top of the connector 102 has a latching tooth 4, the thread bottom of the inner side of the outer tube 201 has a groove 3, and the end of the connector 102 also has a groove 3, and the end between the inner tube 202 and the outer tube 201 and close to the syringe 2 has a latching tooth 4, or the thread top of the connector 102 has a latching tooth 4, the thread bottom of the inner side of the outer tube 201 has a groove 3, and the end of the connector 102 has a latching tooth 4, and the side between the inner tube 202 and the outer tube 201 and close to the syringe 2 has a groove 3.

[0056] In this embodiment, a snap-fit ​​structure is not only provided between the end of the connector 102 and the end of the connector tube close to the syringe 2, but also between the thread top of the connector 102 and the thread bottom of the outer tube 201 of the connector tube. This can further enhance the tightness of the connection between the sealing cap 1 and the syringe 2, making it less likely to become loose, thereby further improving the sealing of the product.

[0057] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealed prefilled syringe, comprising a sealing cap, a syringe, a piston and a push rod, wherein the piston is connected to the push rod, the piston is located in the syringe, and the sealing cap is threadedly connected to the syringe, characterized in that: When the sealing cap is screwed into the syringe and the threaded connection with the syringe is completed, the sealing cap and the syringe can be engaged with each other.

2. A sealed prefilled syringe according to claim 1, characterized in that: The sealing cap includes a cap body and a connecting head, the connecting head is communicated with the cap body, an outer side of the connecting head is provided with an external thread, one end of the syringe is connected to a connecting cylinder, the connecting cylinder includes an outer cylinder and an inner cylinder arranged coaxially, the inner cylinder is communicated with the syringe, an inner side of the outer cylinder is provided with an internal thread, and the connecting head can be inserted between the inner cylinder and the outer cylinder and cooperate with the outer cylinder thread.

3. A sealed prefilled syringe according to claim 2, characterized in that: A groove is provided at the end of the connector, and a latching tooth is provided between the inner tube and the outer tube and at one end close to the syringe. After the connector is screwed into the outer tube, the groove can be engaged with the latching tooth.

4. A sealed prefilled syringe according to claim 2, characterized in that: The end of the connector is connected with a latching tooth, and a groove is provided between the inner tube and the outer tube and on one side close to the syringe. After the connector is screwed into the outer tube, the groove can be engaged with the latching tooth.

5. A sealed prefilled syringe according to claim 3 or 4, characterized in that: There are two of each of the latch teeth and the grooves, and the two latch teeth and the two grooves are symmetrically distributed.

6. A sealed prefilled syringe according to claim 3 or 4, characterized in that: The latch teeth are in the shape of triangular prisms, and the grooves are V-shaped grooves.

7. A sealed prefilled syringe according to claim 2, characterized in that: The thread crest of the connector is provided with a latching tooth, the thread bottom of the inner side of the outer tube is provided with a groove, the outer tube has elastic deformation, and the latching tooth can be stuck in the groove.

8. A sealed prefilled syringe according to claim 7, characterized in that: The two sides of the groove are inclined surfaces, and the two sides of the latching teeth are provided with inclined surfaces matching the groove.

9. A sealed prefilled syringe according to claim 3 or 4, characterized in that: The thread crest of the connector is provided with a latching tooth, the inner side of the outer tube is provided with a groove, the outer tube has elastic deformation, and the latching tooth on the thread crest of the connector can be latched into the groove inside the outer tube.

10. A sealed prefilled syringe according to claim 2, characterized in that: The outer side of the cap body is provided with anti-slip grooves.

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