CN116407709B - Injection device - Google Patents
Injection device Download PDFInfo
- Publication number
- CN116407709B CN116407709B CN202310313594.0A CN202310313594A CN116407709B CN 116407709 B CN116407709 B CN 116407709B CN 202310313594 A CN202310313594 A CN 202310313594A CN 116407709 B CN116407709 B CN 116407709B
- Authority
- CN
- China
- Prior art keywords
- self
- push rod
- injection device
- peripheral surface
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000002347 injection Methods 0.000 title claims abstract description 61
- 239000007924 injection Substances 0.000 title claims abstract description 61
- 230000002093 peripheral effect Effects 0.000 claims abstract description 46
- 239000003814 drug Substances 0.000 claims abstract description 36
- 229940079593 drug Drugs 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 14
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 17
- 230000007423 decrease Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 206010011409 Cross infection Diseases 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002906 medical waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/50—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
- A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The present invention relates to an injection device comprising: the drug core barrel is provided with a containing cavity extending along the length direction of the drug core barrel, and the inner wall of the front part of the containing cavity is provided with a retracting part extending inwards in the radial direction; a push rod slidably disposed within the receiving cavity; the self-destroying plug is connected to the push rod, one of the push rod and the self-destroying plug is provided with a protruding part, the other of the push rod and the self-destroying plug is provided with a containing groove corresponding to the protruding part, and the protruding part is inserted into the containing groove; the self-destroying plug is fixed at the front part of the accommodating cavity of the drug core barrel in an interference fit mode, and the friction force between the outer peripheral surface of the self-destroying plug and the inner peripheral surface of the retracting part is larger than the friction force between the outer peripheral surface of the protruding part and the inner peripheral surface of the accommodating groove. The injection device of the invention does not set an easy break point any more, and avoids the problem of lower yield in the demolding process.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to an injection device.
Background
In the medical field, in order to avoid cross infection, the injection device is preferably a disposable injection device, and the disposable injection device is used as medical waste after being used. Disposable injection devices include needle-containing and needleless injection devices, and in order to prohibit the repeated use of needleless cartridge syringes, existing injection devices typically provide easy break points on the push rod, but such designs require the formation of a mold release, which is prone to breakage during formation, and yields are low.
Accordingly, there is a need for further improvements in existing single use injection devices.
The information disclosed in the background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention provides an injection device, which is free from setting an easy break point, and avoids the problem of lower yield in the demolding process.
The present invention provides an injection device comprising: the drug core barrel is provided with a containing cavity extending along the length direction of the drug core barrel, and the inner wall of the front part of the containing cavity is provided with a retracting part extending inwards in the radial direction; a push rod slidably disposed within the receiving cavity; a self-destructing plug connected to the push rod, and one of the push rod and the self-destructing plug is provided with a protruding portion, the other of the push rod and the self-destructing plug is provided with a receiving groove corresponding to the protruding portion, and the protruding portion is inserted into the receiving groove; the self-destroying plug is fixed at the front part of the accommodating cavity of the drug core barrel in an interference fit mode, and the friction force between the outer peripheral surface of the self-destroying plug and the inner peripheral surface of the retracting part is larger than the friction force between the outer peripheral surface of the protruding part and the inner peripheral surface of the accommodating groove.
Preferably, the self-destructing plug further comprises: a main body having an outer peripheral surface capable of contacting an inner peripheral surface of the indented portion, the main body being provided with communication grooves communicating to front and rear sides of the main body; an extension portion provided at a front end of the main body, the extension portion having a diameter gradually decreasing in a direction from rear to front.
Preferably, the radius of the circular arc of the communicating groove ranges from 0.23 to 0.27mm.
Preferably, the front end of the medicine core barrel is provided with an injection part extending forwards, and a taper hole is arranged in the injection part.
Preferably, the front end of the push rod is provided with an expansion part extending inwards in a radial direction, and the expansion part is attached to the inner surface of the accommodating cavity of the medicine core barrel and can slide relatively.
Preferably, a sealing ring is arranged between the expansion part and the inner surface of the accommodating cavity of the medicine core barrel.
Preferably, the expansion part is provided with a mounting groove for mounting the seal ring.
Preferably, the injection device further comprises a luer fitting.
Preferably, the injection device further comprises a spacer.
Preferably, the front end of the medicine core barrel is provided with a puncture needle.
According to the injection device, the friction force between the outer peripheral surface of the self-destroying plug and the inner peripheral surface of the retracting part is larger than the friction force between the outer peripheral surface of the protruding part and the inner peripheral surface of the accommodating groove, and the protruding part is separated from the accommodating groove, so that the self-destroying plug is separated from the push rod, the injection device cannot be reused, and the problem of lower yield in the demolding process is avoided because the injection device is not provided with an easy break point.
The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following embodiments, which are incorporated herein, and which together serve to explain the particular principles of the invention.
Drawings
Fig. 1 is a schematic structural view of an injection device according to an embodiment of the present invention;
FIG. 2 is a schematic view of another injection device according to an embodiment of the present invention;
FIG. 3 is a schematic view of the self-destructing plug of FIG. 1;
FIG. 4 is a schematic view of the self-destructing plug of FIG. 1 from another perspective;
fig. 5 is a schematic view of the working state of the self-destructing plug, which illustrates a state when the outer peripheral surface of the body of the self-destructing plug is not in contact with the inner peripheral surface of the indented portion of the inner surface of the receiving cavity of the cartridge;
fig. 6 is a second schematic view of the working state of the self-destructing plug, illustrating a state when the outer circumferential surface of the body of the self-destructing plug is in contact with a portion of the inner circumferential surface of the indented portion of the inner surface of the containment cavity of the cartridge;
fig. 7 is a schematic structural view of the cartridge;
FIG. 8 is a schematic structural view of a push rod;
fig. 9 is a third schematic view of the working state of the self-destructing plug, illustrating a state when the outer peripheral surface of the body of the self-destructing plug is in contact with the whole of the inner peripheral surface of the indented portion of the inner surface of the receiving cavity of the cartridge;
fig. 10 is a schematic diagram of the working state of the self-destructing plug, which illustrates the state that the self-destructing plug is separated from the push rod.
It should be understood that the drawings are not necessarily to scale, presenting a simplified representation of various features illustrative of the basic principles of the invention. The particular design features disclosed herein (including, for example, particular dimensions, orientations, locations, and shapes) will be determined in part by the particular application and environment in which they are to be used.
In the drawings, like numerals refer to the same or equivalent parts of the invention throughout the several views of the drawings.
Detailed Description
Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that the present description is not intended to limit the invention to these exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
The front end in the embodiments of the present invention refers to the end of the injection device that is closer to the human body when in use, and the rear end refers to the end of the injection device that is farther from the human body when in use.
An injection device according to an embodiment of the present invention will be described with reference to fig. 1 to 10.
With reference to fig. 1, an injection device according to an embodiment of the present invention includes: the drug core barrel 100, the push rod 200 and the self-destroying plug 300.
The cartridge 100 has a receiving cavity 101 extending in a longitudinal direction thereof, and an inner wall of a front portion of the receiving cavity is provided with a radially inwardly extending indented portion 102. The accommodating chamber 101 is used for accommodating a medical fluid.
The push rod 200 is slidably disposed within the receiving chamber 101.
The self-destructing plug 300 is connected to the push rod 200, and one of the push rod 200 and the self-destructing plug 300 is provided with a protrusion 301, and the other of the push rod 200 and the self-destructing plug 300 is provided with a receiving groove 201 corresponding to the protrusion 301, the protrusion 301 being inserted into the receiving groove 201. The self-destroying plug 300 is driven by the push rod 200 to push the liquid medicine to be injected into a human body.
The outer peripheral surface of the self-destroying plug 300 contacts with the inner peripheral surface of the retracting portion 102 under the pushing of the push rod 200, the self-destroying plug 300 is fixed at the front portion of the accommodating cavity 101 of the drug core barrel 100 in an interference fit manner, and the friction force between the outer peripheral surface of the self-destroying plug 300 and the inner peripheral surface of the retracting portion 102 is greater than the friction force between the outer peripheral surface of the protruding portion 301 and the inner peripheral surface of the accommodating groove 201.
When the push rod 200 drives the self-destruct plug 300 to push to the front of the accommodating cavity 101 (i.e., after the drug injection is completed), the self-destruct plug 300 is fixed to the front of the accommodating cavity 101 of the drug core barrel 100 by means of interference fit, if the user wants to use again to pull the push rod 200, since the friction between the outer circumferential surface of the self-destruct plug 300 and the inner circumferential surface of the retracting part 102 is greater than the friction between the outer circumferential surface of the protruding part 301 and the inner circumferential surface of the accommodating groove 201, the protruding part 301 is separated from the accommodating groove 201, so that the self-destruct plug 300 is separated from the push rod 200, and the self-destruct plug 300 stays at the front of the accommodating cavity 101, so that the injection device cannot be used again. Because the injection device of the invention is not provided with the easy break point, the problem of lower yield in the demolding process is avoided.
The friction force between the outer peripheral surface of the protruding portion 301 and the inner peripheral surface of the accommodation groove 201 may be obtained by adding a boss, a truncated cone, a recess, or the like to the outer peripheral surface of the protruding portion 301 and/or the inner peripheral surface of the accommodation groove 201.
In the embodiment shown in fig. 1, the protrusion 301 is provided at the rear of the self-destruct plug 300, and the receiving groove 201 is provided at the front of the push rod 200.
In the embodiment shown in fig. 2, the protrusion 301 is provided at the front of the push rod 200, and the receiving groove 201 is provided at the rear of the self-destruct plug 300.
In an exemplary embodiment, as shown in fig. 3 and 4, the self-destructing plug 300 further includes: a body 302 and an extension 303.
The outer circumferential surface of the main body 302 can be brought into contact with the inner circumferential surface of the retracting portion 102 by pushing the push rod 200, and the main body 302 is provided with a communication groove 304, and the communication groove 304 communicates to the front side and the rear side of the main body 302. The protrusion 301 is provided at the rear end of the main body 302.
An extension 303 is provided at the front end of the main body 302, and the diameter of the extension 303 gradually decreases in the direction from rear to front. The extension 303 is formed integrally with the body 302.
As shown in fig. 5, a gap 305 exists between the outer peripheral surface of the main body 302 and the portion other than the indented portion 102 of the inner surface of the accommodating chamber 101 of the cartridge 100.
As shown in fig. 5, when the outer peripheral surface of the main body 302 is not in contact with the inner peripheral surface of the indented portion 102 of the inner surface of the accommodating chamber 101 of the cartridge 100, the portion of the accommodating chamber 101 on the front side of the main body 302 communicates with the portion of the accommodating chamber 101 on the rear side of the main body 302 so that the liquid medicine can flow between the portion of the accommodating chamber 101 on the front side and the portion on the rear side of the main body 302.
As shown in fig. 6, after the outer circumferential surface of the main body 302 contacts the inner circumferential surface of the indented portion 102 of the inner surface of the receiving chamber 101 of the cartridge 100 (i.e., the end stage of the stroke of pushing the push rod 200 to inject the liquid medicine), if there is no communication groove 304, a closed space is formed in the space of the portion of the receiving chamber 101 located at the rear side of the main body 302, and as the push rod 200 is gradually pushed, the space becomes smaller and smaller, the liquid medicine in the space needs a larger pressure to be compressed, so that it is difficult for the user to push the push rod 200 in the end stage of the stroke of pushing the push rod 200 to inject the residual liquid medicine in the receiving chamber 101 smoothly.
The communication groove 304 of the main body 302 opens to the front and rear sides of the main body 302, so that the medicine liquid in the space of the accommodating chamber 101 located at the rear side of the main body 302 in fig. 6 can enter the space of the accommodating chamber 101 located at the front side of the main body 302 through the communication groove 304, thereby allowing the user to push the push rod 200 with a smaller force at the end stage of the stroke of injecting the medicine liquid.
In an exemplary embodiment, the radius of the circular arc of the communication groove 304 ranges from 0.23 to 0.27mm. Specifically, the circular arc radius of the communication groove 304 is 0.25mm.
In the exemplary embodiment, as shown in fig. 4, the communication grooves 304 are provided in 2 and symmetrically provided on the outer circumferential surface of the main body 302.
In the illustrated embodiment, the communication grooves 304 are provided in 2, but the number thereof may be adjusted according to circumstances, and may be provided in any number of 1 to 10, for example.
The communication groove 304 may not be provided on the outer peripheral surface of the main body 302 as long as it communicates to the front side and the rear side of the main body 302.
In an exemplary embodiment, referring to fig. 1 and 7 in combination, the front end of cartridge 100 is provided with a forwardly extending injection portion 103, and the injection portion 103 is provided with a tapered bore 104 therein corresponding to the extension portion 303. The tapered bore 104 is shaped to conform to the shape of the extension 303.
Specifically, as shown in fig. 3, the extension 303 includes a conical extension 306 and a truncated cone-shaped extension 307 formed as one body, wherein the taper of the conical extension 306 is larger than the taper of the truncated cone-shaped extension 307, the diameter of the conical extension 306 gradually decreases in the back-to-front direction, the diameter of the truncated cone-shaped extension 307 gradually decreases in the back-to-front direction, and the truncated cone-shaped extension 307 is connected with the main body 302.
In an exemplary embodiment, as shown in fig. 1, 5, 6 and 8, the front end of the push rod 200 is provided with a radially inward extending expansion 202, and the expansion 202 is fitted to the inner surface of the receiving cavity 101 of the cartridge 100 and is capable of sliding relatively.
In an exemplary embodiment, as shown in fig. 1, a seal 203 is provided between the extension 202 and the inner surface of the containment chamber 101 of the cartridge 100.
In an exemplary embodiment, as shown in fig. 8, the extension 202 is provided with a mounting groove 204, the mounting groove 204 being used for mounting a sealing ring.
In an exemplary embodiment, and as shown in FIG. 1, the injection device further includes a spacer 401, which may be used for injection into humans and animals. When the injection is carried out for people, the spacer 401 is beneficial to supporting the skin to improve the injection effect, and the spacer 401 is not needed when the injection is carried out for animals.
In an exemplary embodiment, and as shown in fig. 2, the injection device further includes a luer fitting 402. In pre-filling, luer fitting 402 may be used to mount a rubber sleeve that isolates the syringe environment from the outside world. Luer fitting 402 is also provided with internal threads to facilitate connection of a needle.
In the embodiment of fig. 1 and 2, the injection device is exemplified by a needleless injection device.
The injection device of the present invention may also be a needle-based injection device, i.e. a lancet (not shown in the figures) is provided at the front end of the cartridge 100.
The operation of the injection device according to the embodiment of the present invention will be described with reference to the accompanying drawings.
At the time of shipment, the outer peripheral surface of the self-destruct plug 300 does not contact the inner peripheral surface of the retracting portion 102. In addition, a spacer may be provided between the rear end of the cartridge 100 and the rear end of the push rod 200 to prevent the outer circumferential surface of the self-destruct plug 300 from contacting the inner circumferential surface of the indented portion 102 due to a malfunction.
If the medicine liquid is required to be sucked, the push rod 200 is pulled to drive the self-destructing plug 300 to move backwards, so that the medicine liquid is sucked into the accommodating cavity 101 of the medicine core barrel 100, and after the medicine liquid is sucked, the push rod 200 is slightly pushed to discharge the air in the accommodating cavity 101, and at this time, the state of the injection device is shown in fig. 1. If the factory leaves the factory, the factory will pre-store the medicine liquid in the accommodating chamber 101 of the medicine cartridge 100, i.e., there is no need to suck the medicine liquid, and the above-mentioned process does not exist.
The front end of the injection part 103 of the injection device is aligned with the site to be injected.
Pushing the push rod 200 to drive the self-destructing plug 300 to move forward, the self-destructing plug 300, the expansion portion 202 of the push rod 200 and the sealing ring 203 together push the liquid medicine in the accommodating cavity 101 to the taper hole 104 of the injection portion 103, and the liquid medicine is injected into the human body through the taper hole 104. The process can be divided into the following four phases.
As shown in fig. 5, when the outer peripheral surface of the main body 302 is not in contact with the inner peripheral surface of the indented portion 102 of the inner surface of the accommodating chamber 101 of the cartridge 100, the portion of the accommodating chamber 101 on the front side of the main body 302 communicates with the portion of the accommodating chamber 101 on the rear side of the main body 302 so that the liquid medicine can flow between the portion of the accommodating chamber 101 on the front side and the portion on the rear side of the main body 302.
As shown in fig. 6, when the outer peripheral surface of the main body 302 is in contact with the inner peripheral surface of the indented portion 102 of the inner surface of the accommodating chamber 101 of the cartridge 100, and the aforementioned closed space gradually decreases, the chemical liquid in the space of the accommodating chamber 101 located at the rear side of the main body 302 can enter the space of the accommodating chamber 101 located at the front side of the main body 302 through the communication groove 304.
As shown in fig. 9, when the self-destruct plug moves to the forefront of the accommodating chamber 101, the inner circumferential surface of the indented portion 102 of the inner surface of the accommodating chamber 101 of the cartridge 100 is completely in contact with the outer circumferential surface of the main body 302 of the self-destruct plug 300, and at this time, the drug injection is completed.
With reference to fig. 10, if the user wants to use the injection device again, the push rod 200 needs to be pulled on the basis of fig. 9, and when the user's pulling force increases to exceed the friction force between the outer circumferential surface of the protrusion 301 and the inner circumferential surface of the accommodating groove 201 (at this time, the user's pulling force does not exceed the friction force between the outer circumferential surface of the self-destruct plug 300 and the inner circumferential surface of the retracting portion 102), the self-destruct plug 300 is still fixed at the front portion of the accommodating cavity 101 of the cartridge 100, and the protrusion 310 is separated from the accommodating groove 201, so that the self-destruct plug 300 is separated from the push rod 200, so that the self-destruct plug 300 cannot move along with the push rod 200, and further re-sucking of the medicine liquid cannot be completed, thereby realizing self-destruction of the injection device.
For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "upper", "lower", "upwardly", "downwardly", "front", "rear", "back", "inner", "outer", "inwardly", "outwardly", "inner", "outer", "outwardly", "forwardly", "rearwardly" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. The foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable others skilled in the art to make and utilize the invention in various exemplary embodiments and with various alternatives and modifications. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. An injection device, comprising:
the drug core barrel is provided with a containing cavity extending along the length direction of the drug core barrel, and the inner wall of the front part of the containing cavity is provided with a retracting part extending inwards in the radial direction;
a push rod slidably disposed within the receiving cavity;
the self-destroying plug is connected to the push rod and is positioned at the front part of the push rod, one of the push rod and the self-destroying plug is provided with a protruding part, the other one of the push rod and the self-destroying plug is provided with a containing groove corresponding to the protruding part, and the protruding part is inserted into the containing groove;
the self-destroying plug is pushed to the front part of the accommodating cavity under the pushing of the push rod, the outer peripheral surface of the self-destroying plug is in contact with the inner peripheral surface of the retracting part, the self-destroying plug is fixed at the front part of the accommodating cavity of the drug core barrel in an interference fit mode, and the friction force between the outer peripheral surface of the self-destroying plug and the inner peripheral surface of the retracting part is larger than the friction force between the outer peripheral surface of the protruding part and the inner peripheral surface of the accommodating groove, so that the self-destroying plug is separated from the push rod when the push rod is pulled backwards.
2. The injection device of claim 1, wherein the self-destructing plug further comprises:
a main body having an outer peripheral surface capable of contacting an inner peripheral surface of the indented portion, the main body being provided with communication grooves communicating to front and rear sides of the main body;
an extension portion provided at a front end of the main body, the extension portion having a diameter gradually decreasing in a direction from rear to front.
3. The injection device according to claim 2, wherein the radius of the circular arc of the communication groove ranges from 0.23 to 0.27mm.
4. The injection device of claim 2, wherein the front end of the cartridge is provided with a forwardly extending injection portion having a tapered bore disposed therein.
5. The injection device of claim 1, wherein the front end of the push rod is provided with a radially inwardly extending extension that engages and is relatively slidable with an inner surface of the receiving cavity of the cartridge.
6. The injection device of claim 5, wherein a sealing ring is disposed between the expansion and an inner surface of the containment chamber of the cartridge.
7. The injection device of claim 6, wherein the extension is provided with a mounting groove for mounting the sealing ring.
8. The injection device of claim 1, further comprising a luer.
9. The injection device of claim 1, further comprising a spacer.
10. The injection device of claim 1, wherein the front end of the cartridge is provided with a spike.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310313594.0A CN116407709B (en) | 2023-03-28 | 2023-03-28 | Injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310313594.0A CN116407709B (en) | 2023-03-28 | 2023-03-28 | Injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116407709A CN116407709A (en) | 2023-07-11 |
| CN116407709B true CN116407709B (en) | 2024-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310313594.0A Active CN116407709B (en) | 2023-03-28 | 2023-03-28 | Injection device |
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| Country | Link |
|---|---|
| CN (1) | CN116407709B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117504053A (en) * | 2023-11-16 | 2024-02-06 | 江苏乐聚医药科技有限公司 | Medicine tube for needleless injector and needleless injector comprising same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2652412Y (en) * | 2003-09-28 | 2004-11-03 | 孙锡炎 | Self-destroy disposable syringe |
| CN213698350U (en) * | 2020-08-25 | 2021-07-16 | 常州市华伟医疗用品有限公司 | Self-destroying rubber plug for syringe |
| CN217448623U (en) * | 2022-05-09 | 2022-09-20 | 山东威高集团医用高分子制品股份有限公司 | Disposable self-destruction syringe |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI243064B (en) * | 2004-05-21 | 2005-11-11 | Ming-Jeng Shiu | Injector for single use |
| CN2877738Y (en) * | 2006-03-28 | 2007-03-14 | 李健全 | Disposable completely self-destroyable safety syringe |
-
2023
- 2023-03-28 CN CN202310313594.0A patent/CN116407709B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2652412Y (en) * | 2003-09-28 | 2004-11-03 | 孙锡炎 | Self-destroy disposable syringe |
| CN213698350U (en) * | 2020-08-25 | 2021-07-16 | 常州市华伟医疗用品有限公司 | Self-destroying rubber plug for syringe |
| CN217448623U (en) * | 2022-05-09 | 2022-09-20 | 山东威高集团医用高分子制品股份有限公司 | Disposable self-destruction syringe |
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| Publication number | Publication date |
|---|---|
| CN116407709A (en) | 2023-07-11 |
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