CN211584672U

CN211584672U - Prefilled syringe

Info

Publication number: CN211584672U
Application number: CN201922319301.1U
Authority: CN
Inventors: 刘小英; 黄洪; 张雪玲; 陈汝慧
Original assignee: Chengdu Qingshan Likang Pharmaceutical Co Ltd
Current assignee: Chengdu Qingshan Likang Pharmaceutical Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-09-29
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to the technical field of medical injectors, in particular to a pre-filling and sealing injector; the adopted technical scheme is as follows: a pre-filling and sealing injector comprises a spiral head, an injection head, a protective cap, a needle cylinder, a piston and a push rod, wherein the spiral head is sleeved outside the injection head and is in threaded connection with the protective cap, and the spiral head and the injection head are both fixedly connected with the needle cylinder; the piston can move axially in the syringe along the syringe, and the piston is detachably connected with the push rod. When the utility model is stored, the piston is arranged in the needle cylinder, the push rod is removed, and the two ends of the needle cylinder are respectively sealed by the piston and the protective cap, so as to realize the sealing of the injector; because only the protective cap and the needle cylinder are arranged outside the injector during storage, the utility model has the advantages of small storage space, low storage cost and capability of avoiding the push rod from being pushed during storage. When the injection is needed, the push rod is connected with the piston, and the protective cap is removed.

Description

Prefilled syringe

Technical Field

The utility model relates to a medical syringe technical field, concretely relates to embedment syringe in advance.

Background

The prefilled syringe fills liquid medicine or medicinal powder in the syringe, then seals the injection head through the protective cap, and is placed in the sterilization cabinet for storage, so that the prefilled syringe has two functions of medicine storage and common injection, is safe and reliable, reduces labor and cost consumed from production to use to the maximum extent compared with the traditional mode of 'medicine bottle + syringe', and brings advantages in many aspects as long as air pressure and clinical use are achieved.

Because the medicine needs to be pre-packaged in the needle cylinder, and a certain distance is reserved between the piston of the injector and the end part of the injection head, the occupied space is overlarge during the storage of the injector, so that the number of pre-packaged injectors capable of being stored in the same sterilization cabinet is reduced, and the storage cost of the pre-packaged injectors is high. Meanwhile, the piston is arranged in the middle of the piston cylinder, the push rod is easy to push in the transportation process, once the protective cap is loosened, the medicine in the injector is exposed in the air, and the sterile environment of the medicine is damaged.

SUMMERY OF THE UTILITY MODEL

To above-mentioned embedment syringe in advance occupies that storage space is big, store with high costs, when storing the push rod have by the technical problem who promotes the risk, the utility model provides a embedment syringe in advance occupies that storage space is little, the storage is with low costs, and the push rod is promoted when can avoiding the storage to prevent that the medicine from leaking.

The utility model discloses a following technical scheme realizes:

a pre-filling and sealing injector comprises a spiral head, an injection head, a protective cap, a needle cylinder, a piston and a push rod, wherein the spiral head is sleeved outside the injection head and is in threaded connection with the protective cap, and the spiral head and the injection head are both fixedly connected with the needle cylinder; the piston can move axially in the syringe along the syringe, and the piston is detachably connected with the push rod.

The screw head of the utility model is connected with the protective cap by screw, and the piston is connected with the push rod in a detachable way; during storage, the piston is arranged in the needle cylinder, the push rod is removed, and the two ends of the needle cylinder are respectively sealed through the piston and the protective cap, so that the sealing of the injector is realized; because only the protective cap and the needle cylinder are arranged outside the injector during storage, the utility model has the advantages of small storage space, low storage cost and capability of avoiding the push rod from being pushed during storage. When the injection is needed, the push rod is connected with the piston, and the protective cap is removed.

Furthermore, a limiting convex shoulder is arranged at one end, opposite to the piston, of the push rod, a limiting structure is arranged on the inner side wall of the needle cylinder and used for controlling the position of the limiting convex shoulder in the length direction of the needle cylinder so as to prevent the situation that when the push rod is connected, the push rod pushes the piston to damage the sealing performance between the protective cap and the injection head and cause pollution due to the contact of medicines and air.

As the specific implementation mode of the limiting structure, the inner side wall of the needle cylinder is provided with a first limiting bulge and a second limiting bulge, the limiting structure is composed of the first limiting bulge and the second limiting bulge, the first limiting bulge and the second limiting bulge are sequentially arranged along the length direction of the needle cylinder, and a gap between the first limiting bulge and the second limiting bulge is used for accommodating the limiting convex shoulder.

Optionally, a third limiting protrusion is arranged on the side wall of the push rod, and the third limiting protrusion is used for controlling the position of the end part of the push rod in the length direction in the needle cylinder

As the specific implementation mode that the piston is connected with the push rod, the piston is connected with the push rod through threads, so that the push rod and the piston are convenient to disassemble and assemble, and the connection is reliable.

Further, spiral head overcoat is equipped with solid fixed ring, gu fixed ring is connected with the helmet through a plurality of splice bars, the splice bar is fracture when rotating the helmet. The stability of the connection between the protective cap and the spiral head can be improved, and the looseness of the protective cap caused by transportation is reduced; meanwhile, the connecting ribs are broken when the protective cap is rotated, so that whether the protective cap rotates can be easily distinguished, the contaminated pre-filling and sealing syringe is prevented from being put into use, and the treatment safety is ensured.

As a specific implementation mode of connecting the spiral head and the protective cap, the spiral head is an internal thread sleeve, one end of the protective cap is provided with a thread column, the thread column is screwed in the spiral head, the end part of the thread column is provided with a blind hole, and the injection head is inserted in the blind hole so as to increase the sealing area between the injection head and the protective cap and improve the sealing performance of the injector.

Preferably, the injection head is conical, the blind hole is a tapered hole, and the side wall of the blind hole and the side wall of the injection head form a tapered surface seal, so that the sealing performance of the injection head is further improved, and the pollution caused by the contact of the medicine in the injector and air before use is prevented.

Furthermore, a plurality of anti-skidding protrusions are arranged on the outer portion of one end, opposite to the threaded column, of the protective cap, so that the protective cap is prevented from skidding when the protective cap is opened.

As a specific embodiment of the stud, the stud is a rib extending along the length of the cap.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the spiral head is in threaded connection with the protective cap, and the piston is detachably connected with the push rod; during storage, the piston is arranged in the needle cylinder, the push rod is removed, and the two ends of the needle cylinder are respectively sealed through the piston and the protective cap, so that the sealing of the injector is realized; because only the protective cap and the needle cylinder are arranged outside the injector during storage, the utility model has the advantages of small storage space, low storage cost and capability of avoiding the push rod from being pushed during storage. When the injection is needed, the push rod is connected with the piston, and the protective cap is removed.

2. The syringe is characterized in that a limiting convex shoulder is arranged at one end, opposite to the piston, of the push rod, a limiting structure is arranged on the inner side wall of the syringe and used for controlling the position of the limiting convex shoulder in the length direction of the syringe, so that the situation that when the push rod is connected, the push rod pushes the piston to damage the sealing performance between the protective cap and the injection head, and the medicine is contacted with air to cause pollution is avoided.

3. The utility model discloses a spiral head overcoat is equipped with solid fixed ring, and solid fixed ring passes through the splice bar to be connected with the helmet, can increase the steadiness that helmet and spiral head are connected, reduces because of the transportation helmet that leads to is not hard up. Meanwhile, the connecting ribs are broken when the protective cap is rotated, so that whether the protective cap rotates can be easily distinguished, the contaminated pre-filling and sealing syringe is prevented from being put into use, and the treatment safety is ensured.

4. The spiral head is equipped with the screw thread post for internal thread cover, helmet one end, screw thread post tip is equipped with the blind hole, and the blind hole lateral wall forms the conical surface with the injection head lateral wall and seals, can improve the sealing performance between helmet and the injection head, prevents that the medicine in the syringe from leading to the fact the pollution with the air contact before using.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-screw head, 12-fixing ring, 13-connecting rib, 2-injection head, 3-protective cap, 31-threaded column, 32-blind hole, 33-anti-skid bulge, 4-syringe, 5-piston, 6-push rod, 61-limit shoulder, 62-third limit bulge, 7-limit structure, 71-first limit bulge and 72-second limit bulge.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1

A pre-filling and sealing injector comprises a screw head 1, an injection head 2, a protective cap 3, a syringe 4, a piston 5 and a push rod 6. The screw head 1 is sleeved outside the injection head 2, and the screw head 1 is in threaded connection with the protective cap 3; the spiral head 1 and the injection head 2 are both fixedly connected with the needle cylinder 4, and the injection head 2, the spiral head 1 and the needle cylinder 4 are generally integrally injection-molded. The piston 5 can move axially along the syringe 4 in the syringe 4, and it can be known that the piston 5 is closely attached to the syringe 4 when at rest and moves axially along the syringe 4 when pushed by the push rod 6. The piston 5 and the push rod 6 are detachably connected, such as through clamping, screwing and pin joint.

The screw head 1 of the utility model is in screw connection with the protective cap 3, and the piston 5 is detachably connected with the push rod 6; during storage, the piston 5 is arranged in the needle cylinder 4, the push rod 6 is removed, and the two ends of the needle cylinder are respectively sealed through the piston 5 and the protective cap 3, so that the sealing of the injector is realized. Because only the protective cap 3 and the needle cylinder 4 are arranged outside the injector during storage, the utility model has the advantages of small storage space, low storage cost and capability of avoiding the push rod 6 from being pushed during storage. When the injector needs to be used for injection, the push rod 6 is connected with the piston 5, and the protective cap 3 is removed, and for a syringe without a needle, the needle needs to be fixed on the injection head 2.

Example 2

Based on the example 1, one end of the push rod 6, which faces the piston 5, is provided with a limiting shoulder 61, and the inner side wall of the needle cylinder 4 is provided with a limiting structure 7, wherein the limiting structure 7 is used for controlling the position of the limiting shoulder 61 in the length direction in the needle cylinder 4. It will be appreciated that the external diameter of the stop shoulder 6 is less than the internal diameter of the barrel 4 and greater than the minimum internal diameter of the stop means 7; when the push rod 6 is connected, the position of the limit shoulder 6 is limited by the limit structure 7 (generally, the push rod 6 is just contacted with the piston 5), so that the situation that when the push rod 6 is connected, the push rod 6 pushes the piston 5 to destroy the tightness between the protective cap 3 and the injection head 2, and the medicine is contacted with air to cause pollution is prevented. And when the medicine is injected, the piston 5 is pushed forwards continuously.

As a specific embodiment of the limiting structure 7, the sidewall of the inner 4 of the needle cylinder is provided with a first limiting protrusion 71 and a second limiting protrusion 72, the limiting structure 7 is composed of the first limiting protrusion 71 and the second limiting protrusion 72, the first limiting protrusion 71 and the second limiting protrusion 72 are sequentially arranged along the length direction of the needle cylinder 4, and a gap between the first limiting protrusion 71 and the second limiting protrusion 72 is used for accommodating the limiting shoulder 61.

It will be appreciated that the needle cylinder 4 and the plunger 6 are typically made of plastic, have a certain elasticity and can be compressed. When in use, the limit shoulder 61 of the push rod 6 is clamped between the first limit bulge 71 and the second limit bulge 72 under the action of thrust; when injection is needed, the push rod 6 is pushed in a forced direction, so that the shoulder 61 slides out from between the first limit protrusion 71 and the second limit protrusion 72. Wherein the first and

second limit protrusions

71 and 72 have an arc-shaped cross section along the longitudinal direction of the cylinder 4 in order to reduce the pushing resistance of the push rod 6.

As a specific embodiment of the connection between the piston 5 and the push rod 6, the piston 5 and the push rod 6 are connected through threads, so that the push rod 6 and the piston 5 can be conveniently detached and reliably connected.

Example 3

Based on embodiment 1, the sidewall of the plunger is provided with a third limiting protrusion 62, and the third limiting protrusion 62 is used to control the position of the end of the plunger 6 in the longitudinal direction of the syringe 4, so as to provide a different limiting manner for the plunger 6 from embodiment 2.

When the push rod 6 is connected, the position of the push rod 6 is limited through the third limiting bulge 62, so that the push rod 6 is prevented from pushing the piston 5 at the moment; during injection, the interface of the piston 5 is continuously pushed towards the injection head 2, and the third limit projection 62 is compressed in the syringe 4 through the deformation of the push rod 6 and the third limit projection 62, and the pushing of the push rod 6 is not influenced.

Similarly, the piston 5 is connected with the push rod 6 through threads, so that the push rod 6 and the piston 5 can be conveniently disassembled and assembled, and the connection is reliable.

Example 4

Based on any one of embodiment 1, embodiment 2 and embodiment 3, the screw head 1 is externally sleeved with a fixing ring 12, the fixing ring 12 is connected with the protective cap 3 through a plurality of connecting ribs 13, and the connecting ribs 13 are broken when the protective cap 3 is rotated; that is, the cap 3 and the fixing ring 12 form a plastic anti-theft bottle cap, and the processing technology is the same as the processing mode of the plastic anti-theft bottle cap of the existing beverage bottle, i.e. polyolefin is generally used as the main raw material and is processed and formed by injection molding, hot pressing or other technologies. Preferably, the connecting ribs 13 are uniformly distributed along the circumferential direction of the fixing ring 12.

It can be understood that the screw head 1 of the injector is externally sleeved with a fixing ring 12, and the fixing ring 12 is connected with the protective cap 3 through a connecting rib 13 to form a plastic anti-theft end cover; can increase the steadiness that helmet 3 and spiral head 1 are connected on the one hand, reduce because of the transportation helmet 3 that leads to is not hard up, on the other hand can increase the leakproofness between helmet 3 and spiral head 1. Meanwhile, the connecting ribs 13 are broken when the protective cap 3 is rotated, so that whether the protective cap 3 rotates or not can be easily distinguished, the contaminated pre-filled and sealed injector is prevented from being put into use, and the treatment safety is ensured.

As a specific embodiment of the connection between the screw head 1 and the protective cap 3, the screw head 1 is an internal thread sleeve, one end of the protective cap 3 is provided with a threaded column 31, and the threaded column 31 is screwed in the screw head 1. It can be understood that the screw head 1 is provided with a threaded hole, and the injection head 2 is positioned in the threaded hole; the outer wall of the threaded column 31 is in threaded connection with the inner wall of the spiral head 1, so that the sealing area between the injection head 2 and the protective cap 3 is increased, and the sealing performance of the injector is improved.

Further, the end of the threaded column 31 is provided with a blind hole 32, and the injection head 2 is inserted into the blind hole 32, so as to further improve the sealing performance between the injection head 2 and the protective cap 3.

Preferably, the injection head 2 is conical, the blind hole 32 is a tapered hole, and the side wall of the blind hole 32 and the side wall of the injection head 2 form a tapered surface seal, so that the sealing performance of the injection head 2 is further improved, and the medicine in the injector is prevented from contacting with air before use to cause pollution.

Further, a plurality of anti-slip protrusions 33 are arranged on the outer portion of one end of the protective cap 3, which faces the threaded column 31, so as to prevent the protective cap 3 from slipping when the protective cap 3 is opened.

As a specific embodiment of the anti-slip projection, the anti-slip projection 33 is a rib extending along the length direction of the cap 3, so as to facilitate the production and processing of the cap 3. Preferably, the studs 33 are evenly distributed circumferentially around the cap 3.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A pre-encapsulated injector comprises a spiral head (1), an injection head (2), a protective cap (3), a needle cylinder (4), a piston (5) and a push rod (6), and is characterized in that the spiral head (1) is sleeved outside the injection head (2), the spiral head (1) is in threaded connection with the protective cap (3), and the spiral head (1) and the injection head (2) are both fixedly connected with the needle cylinder (4); the piston (5) can move axially along the needle cylinder (4) in the needle cylinder (4), and the piston (5) is detachably connected with the push rod (6).

2. The pre-filled and sealed syringe as claimed in claim 1, wherein a position-limiting shoulder (61) is arranged at one end of the push rod (6) opposite to the piston (5), a position-limiting structure (7) is arranged on the inner side wall of the syringe (4), and the position-limiting structure (7) is used for controlling the position of the position-limiting shoulder (61) in the length direction of the syringe (4).

3. The pre-filled and sealed syringe as claimed in claim 2, wherein the inner side wall of the syringe (4) is provided with a first limiting protrusion (71) and a second limiting protrusion (72), the limiting structure (7) is composed of the first limiting protrusion (71) and the second limiting protrusion (72), the first limiting protrusion (71) and the second limiting protrusion (72) are sequentially arranged along the length direction of the syringe (4), and a gap between the first limiting protrusion (71) and the second limiting protrusion (72) is used for accommodating the limiting shoulder (61).

4. The pre-filled and sealed injector according to claim 1, characterized in that the side wall of the push rod (6) is provided with a third limit projection (62), and the third limit projection (62) is used for controlling the position of the end part of the push rod (6) in the length direction of the syringe (4).

5. The pre-filled syringe as claimed in any one of claims 1, 2 or 4, wherein the piston (5) is screwed to the plunger (6).

6. Pre-filled and sealed syringe according to claim 5, characterized in that the screw head (1) is externally sheathed with a fixing ring (12), the fixing ring (12) is connected with the protective cap (3) through a plurality of connecting ribs (13), and the connecting ribs (13) are broken when the protective cap (3) is rotated.

7. The pre-filled and sealed injector according to claim 5, characterized in that the screw head (1) is an internal thread sleeve, one end of the protective cap (3) is provided with a thread column (31), the end of the thread column (31) is provided with a blind hole (32), and the injection head (2) is inserted in the blind hole (32).

8. The pre-filled and sealed syringe according to claim 7, characterized in that the injection head (2) is conical, the blind hole (32) is a conical hole, and the side wall of the blind hole (32) forms a conical seal with the side wall of the injection head (2).

9. Pre-filled syringe as claimed in claim 6, characterised in that the cap (3) is externally provided with a plurality of anti-slip protrusions (33) at the end facing the threaded stud (31).

10. Pre-filled syringe according to claim 9, wherein the non-slip protrusions (33) are ribs extending along the length of the cap (3).