CN111450355B - Needle-prick-proof injector capable of pre-loading medicine - Google Patents
Needle-prick-proof injector capable of pre-loading medicine Download PDFInfo
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- CN111450355B CN111450355B CN202010207509.9A CN202010207509A CN111450355B CN 111450355 B CN111450355 B CN 111450355B CN 202010207509 A CN202010207509 A CN 202010207509A CN 111450355 B CN111450355 B CN 111450355B
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- 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
- A61M5/178—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
- A61M5/31533—Dosing mechanisms, i.e. setting a dose
- A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
- A61M5/31536—Blocking means to immobilize a selected dose, e.g. to administer equal doses
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
- A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3286—Needle tip design, e.g. for improved penetration
-
- 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
- A61M2005/3125—Details specific display means, e.g. to indicate dose setting
- A61M2005/3126—Specific display means related to dosing
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Environmental & Geological Engineering (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention relates to a needle-prick-proof injector capable of being preloaded with medicine, which comprises a needle cylinder, a needle head, a plunger piston and a needle head cap; the needle head comprises a double-head needle and a tail sleeve, the tail sleeve is sleeved on the outlet of the needle cylinder, and a sealing film is arranged in the outlet of the needle cylinder; the front end of the needle cylinder is provided with a matching part of a circular wall structure, and the matching part is provided with an external thread; the inner wall of the needle head cap is provided with an internal thread matched with the external thread and can be covered outside the matching part in a screw connection way, and a convex structure is arranged inside the needle head cap along the central axis. The anti-needle-stick injury syringe capable of being preloaded with the medicine can be used for rapid and quantitative accurate administration, has the safety protection function of preventing needle-stick injury, is suitable for self-rescue and mutual rescue and analgesia administration of wounded persons or rapid analgesia administration of rescue persons in emergency situations, and is also suitable for injecting preloaded vaccine for preventing infectious diseases such as new crown pneumonia and the like.
Description
Technical Field
The invention belongs to the technical field of medical instruments, and particularly relates to a needle-prick-prevention injector capable of being preloaded with medicines.
Background
Severe pain is one of the most common symptoms of war wounds, and a large number of researches show that early-stage pain of war wounds has great influence on the physiology, psychology, rehabilitation and other aspects of organisms, and the self-rescue mutual-rescue analgesic administration of the wounds or the quick analgesic administration of rescuers needs to be realized in the early stage. At present, the conventional injection analgesic drugs are difficult to complete in first-line treatment of the wounded, the drugs need to be extracted from an ampoule bottle into an injector on a battlefield and then injected intramuscularly, the operation steps are complex, the time consumption is long, the requirements on the environment such as sterility are high, and the rigid needle is used in emergency, so that the incidental casualties are easily caused. At present, automatic injection devices developed for civil use are mostly used for blood sugar control, tumor drug administration and the like, are not used in the aspect of pain control drugs, have the problems of precise components, complex structure, high cost and the like, and once the problems are difficult to repair, the automatic injection devices also need to be optimized and improved aiming at battlefield environments.
In addition, recent new coronary pneumonia is too abusive and active prevention is urgently needed for vaccines. If after the vaccine is successfully developed, not only a large number of ampoule bottles are needed, but also a large number of syringes need to be equipped, the dispensing process is complicated, the inoculation amount also needs to be strictly controlled, the inoculation work of medical workers is possibly abnormally heavy, the efficiency is low, and the risk of ineffective or excessive inoculation is easily caused.
Chinese patent CN105617488A (application No. CN201610149886.5) discloses a disposable pre-filled liquid medicine pressing type emergency syringe, which is composed of an outer sleeve, a middle sleeve, a double-ended needle, an inner plunger, a push rod and a compressible medicine storage bag. The front end of the middle sleeve is fixed with a double-ended needle, the front ends of the compressible medicine storage bags fixed at the front ends of the outer sleeve and the inner pushing plug are respectively provided with small holes covered by soft rubber, the small holes can be respectively punctured by the double-ended needle from inside to outside, and the medicine storage bags are pre-stored with first-aid liquid medicine. Although the patent of the invention meets the function of prefilling the medicine, the safety setting such as accurate medicine administration and the like cannot be guaranteed.
Chinese patent CN206499729U (application No. CN201621166350.6) discloses a constant-speed quantitative rescue injector, which comprises an injector body, an injector needle part and a speed reducer, wherein the speed reducer is arranged in the middle of the injector body and is movably connected with the injector body; the syringe needle part is movably connected with the syringe body; wherein a fixed dose of pharmacological solution is contained in the syringe body. The patent of the invention solves the problems of prefilling the medicine and decelerating the medicine administration, but is not suitable for being used with analgesic medicine, and needs to achieve the aim of rapid medicine administration.
Disclosure of Invention
Therefore, aiming at the technical problem that the prior art lacks an injector capable of quickly and quantitatively and accurately administering drugs, the invention aims to provide the injector pre-filled with drugs, which is used for quickly and quantitatively and accurately administering drugs, has the protection function of preventing needle stick injuries, is suitable for self-rescue and mutual rescue and analgesia administration of wounded persons or quick analgesia administration of rescue personnel in emergency situations, and is also suitable for pre-filled vaccines for preventing the injection of infectious diseases such as new crown pneumonia and the like.
The invention relates to a needle-prick prevention injector capable of pre-loading medicine, which comprises a needle cylinder, a needle head and a plunger, and is characterized by also comprising a needle head cap;
the needle head comprises a double-ended needle and a tail sleeve, the tail section of the double-ended needle is inserted into the tail sleeve, the end part of the double-ended needle is close to the sleeve opening of the tail sleeve, the tail sleeve is sleeved on the outlet of the needle cylinder, and the outlet of the needle cylinder is provided with a sealing membrane;
the front end of the needle cylinder is provided with a matching part with a circular wall structure, the matching part surrounds the periphery of the outlet of the needle cylinder, the needle head cap is in threaded connection or clamped connection with the inner side or the outer side of the matching part and is used for covering the needle head, a convex structure is arranged inside the needle head cap along the central axis, and the convex structure is provided with a pore passage for the double-ended needle to pass through;
when the needle head cap is screwed backwards, the convex structure is contacted with the tail sleeve and pushes the tail sleeve to be completely sleeved on the outlet of the needle cylinder, and meanwhile, the tail end of the double-ended needle can pierce the sealing membrane.
Preferably, the matching part is provided with an external thread; the inner wall of the needle head cap is provided with an internal thread matched with the external thread and can be covered outside the matching part in a threaded manner.
Preferably, the syringe further comprises a plurality of dose limiting pieces, each dose limiting piece comprises a vertical part and a horizontal part which are connected into a whole, the vertical part is of a column groove structure used for being clamped on the rod part of the plunger, and the horizontal part is of a sheet structure used for blocking the tail part of the syringe.
Preferably, the periphery of the sleeve opening of the tail sleeve is provided with an annular bulge; the cooperation portion inner wall is equipped with the holding ring, the holding ring is used for the location of syringe needle, the position of holding ring sets up the standard and does: when the tail sleeve is sleeved on the outlet of the needle cylinder and the annular bulge does not cross the positioning ring, the double-ended needle does not puncture the sealing membrane; when the annular bulge passes over the positioning ring, the double-ended needle pierces the sealing membrane.
Preferably, the number of the medicine quantity limiting pieces is more than two, and preferably three.
Preferably, the outer wall surface of the needle cylinder is provided with scales.
Preferably, the matching part consists of two semicircular walls, and a gap is reserved between the two semicircular walls.
Preferably, the outer surface of the needle head cap is provided with anti-skid grains.
Preferably, the anti-slip threads are axially convex.
Preferably, the front end of the needle head cap is spherical, and the convex structure protrudes outwards.
The principle of the needle-prick prevention injector capable of being preloaded with medicines is as follows:
when the syringe needle cap is rotated to enable the front end needle head of the double-ended needle to leak, the convex structure arranged on the lost needle head cap jacks up the needle head to puncture the sealing membrane, and then injection can be carried out without additional operation, so that the syringe needle is convenient and fast. When the injection is carried out, the lowest dose limiting piece can be taken down, the plunger is pushed to carry out medicine injection, when the residual dose limiting piece props against the tail of the needle cylinder, the quantitative injection of the medicine is finished, the injection amount of the medicine is limited by the dose limiting piece, and the injection is convenient, rapid and accurate. The plurality of medicine quantity limiting pieces can be taken down for injection in a grading way according to different patients and different situations. For example, when analgesic administration is performed, the administration function of the drug dose can be adjusted according to the pain score: different administration doses can be selected according to the pain degree score, namely mild, moderate and severe. In addition, the three-level pull-out type drug administration device can play a role in reminding repeated drug administration, and is convenient for remembering the previous drug administration dosage.
The injector pre-filled with the medicine can be used for rapid and quantitative accurate administration, is suitable for self-rescue and mutual rescue and analgesia administration of wounded persons or rapid analgesia administration of rescue workers in emergency situations, and is also suitable for pre-filled vaccine injection for preventing infectious diseases such as new coronary pneumonia. Has the following functional advantages:
1. the medicine preset function: the syringe can be pre-filled with liquid medicine, the liquid medicine does not need to be extracted in the operation process, the pollution can be avoided, and the aim of quick administration can be achieved.
2. The administration function of the adjustable drug dosage is as follows: for example, in pain management, different dosages may be administered depending on the severity of the pain, and the severity of the pain may be scored. In vaccine injection, it can also be set according to the vaccine dose. In addition, the three-level pull-out type drug administration device can play a role in reminding repeated drug administration, and is convenient for remembering the previous drug administration dosage.
3. The safety protection function of preventing stabbing: the needle is built in the injector, and the accident such as puncture can be prevented by rotating the display needle.
In addition, the needle body has moderate size, is suitable for holding and pressing, has simple injection action, can be completed by one hand, is convenient for the wounded to inject liquid medicine by oneself, has simple structure and lower manufacturing cost, does not have a complex mechanical device, and can avoid the occurrence of mechanical faults in the operation process.
Drawings
FIG. 1 is a schematic diagram of a pre-filled anti-needle stick syringe of the present invention in an initial state;
FIG. 2 is a schematic view of the injection state of the needle-stick injury prevention syringe of the present invention, which can be pre-filled with medicine;
FIG. 3 is a schematic exploded view of the needle stick injury prevention syringe of the present invention, which may be pre-filled with medication;
FIG. 4 is a fragmentary, exploded, schematic view of a needle stick resistant syringe of the present invention which may be prefilled with a drug;
FIG. 5 is a partial cross-sectional view of the initial state of the needle stick resistant syringe of the present invention which may be prefilled with a drug;
fig. 6 is a partial cross-sectional view of an injection state of the needle stick prevention syringe of the present invention, which may be pre-filled with a drug.
Reference numerals
The syringe 1, the syringe outlet 11, the closing membrane 12, the matching part 13 and the positioning ring 131; the needle head 2, the double-ended needle 21, the tail sleeve 22 and the annular bulge 221; plunger 3, dose spacer 4, vertical part 41, horizontal part 42, needle head cap 5, protruding structure 51, anti-skidding line 52.
Detailed Description
The present invention will be further described with reference to the following examples. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
Fig. 1-3 show a needle-stick injury prevention syringe capable of being preloaded with a drug according to a preferred embodiment of the present invention, which includes a barrel 1, a needle 2, a plunger 3, a drug quantity limiting sheet 4 and a needle cap 5.
Each dosage limiting piece 4 comprises a vertical part 41 and a horizontal part 42 which are connected into a whole, the vertical part 41 is of a column groove structure used for being clamped on the rod part of the plunger 3, and the horizontal part 42 is of a sheet structure used for blocking the tail part of the syringe 1.
As shown in fig. 4-6, the needle 2 includes a double-ended needle 21 and a tail sleeve 22, the tail section of the double-ended needle 21 is inserted into the tail sleeve 22 and the end portion is close to the cuff of the tail sleeve 22, the tail sleeve 22 is sleeved on the syringe outlet 11, and a closing membrane 12 is arranged in the syringe outlet 11.
The front end of the syringe 1 is provided with a matching part 13 with a circular wall structure, the matching part 13 surrounds the periphery of the syringe outlet 11 and consists of two semicircular walls, and a gap is reserved between the two semicircular walls. The matching part 13 is provided with an external thread; the inner wall of the needle head cap 5 is provided with an internal thread matched with the external thread and can be covered outside the matching part 13 in a threaded manner, a convex structure 51 is arranged inside the needle head cap 5 along the central axis, and the convex structure 51 is provided with a pore for the double-ended needle 21 to pass through; the outer surface of the needle head cap 5 is provided with an anti-slip pattern 52, and the anti-slip pattern 52 is an axial bulge. The front end of the needle head cap 5 is spherical, and the convex structure 51 protrudes outwards.
When the needle cap 5 is screwed back, the raised structure 51 comes into contact with the tail sleeve 22 and pushes the tail sleeve 22 to be completely sleeved on the syringe outlet 11, and the tail end of the double-ended needle 21 can pierce the closing membrane 12.
Preferably, the periphery of the opening of the tail sleeve 22 is provided with an annular bulge 221; the inner wall of the matching part 13 is provided with a positioning ring 131, the positioning ring 131 is used for positioning the needle head, and the position of the positioning ring 131 is set as the standard: when the tail sleeve 22 is sleeved on the syringe outlet 11 and the annular protrusion 221 does not cross the positioning ring 131, the double-ended needle 21 does not pierce the closing membrane 12 (see fig. 5); when the annular projection 221 passes beyond the retaining ring 131, the double-ended needle 21 pierces the closure membrane 12 (see fig. 6).
Preferably, the outer wall of the syringe 1 is provided with scales.
The principle of the needle-prick prevention injector capable of being preloaded with medicines is as follows:
the initial state is as shown in fig. 1 and fig. 5, the medicine is stored in the syringe 1 in a closed way, the syringe outlet 11 is closed by the closing membrane 12 before use, when the needle head cap 5 is rotated to make the front end needle of the double-ended needle 21 leak, the convex structure 51 arranged on the needle head cap 5 jacks up the needle head to puncture the closing membrane 12 as shown in fig. 2 and fig. 6, and then the injection can be carried out without additional operation, which is convenient and fast. When the injection is carried out, the lowest dose limiting piece 4 can be taken down, the plunger 3 is pushed to carry out the drug injection, when the residual dose limiting piece 4 is propped against the tail part of the needle cylinder 1, the quantitative injection of the drug is finished, the injection amount of the drug is limited by the dose limiting piece 4, and the injection is convenient, rapid and accurate. The plurality of medicine quantity limiting sheets 4 can be taken down for injection in a grading way according to different patients and different situations. For example, when analgesic administration is performed, the administration function of the drug dose can be adjusted according to the pain score: different administration doses can be selected according to the pain degree score, namely mild, moderate and severe. In addition, the three-level pull-out type drug administration device can play a role in reminding repeated drug administration, and is convenient for remembering the previous drug administration dosage.
The injector pre-filled with the medicine can be used for rapid and quantitative accurate administration, is suitable for self-rescue and mutual rescue and analgesia administration of wounded persons or rapid analgesia administration of rescue workers in emergency situations, and is also suitable for pre-filled vaccine injection for preventing infectious diseases such as new coronary pneumonia. Has the following functional advantages:
1. the medicine preset function: the syringe can be pre-filled with liquid medicine, the liquid medicine does not need to be extracted in the operation process, the pollution can be avoided, and the aim of quick administration can be achieved.
2. The administration function of the adjustable drug dosage is as follows: for example, in pain management, different dosages may be administered depending on the severity of the pain, and the severity of the pain may be scored. In vaccine injection, it can also be set according to the vaccine dose. In addition, the three-level pull-out type drug administration device can play a role in reminding repeated drug administration, and is convenient for remembering the previous drug administration dosage.
3. The safety protection function of preventing stabbing: the needle is built in the injector, and the accident such as puncture can be prevented by rotating the display needle.
In addition, the needle body has moderate size, is suitable for holding and pressing, has simple injection action, can be completed by one hand, is convenient for the wounded to inject liquid medicine by oneself, has simple structure and lower manufacturing cost, does not have a complex mechanical device, and can avoid the occurrence of mechanical faults in the operation process.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A needle-prick prevention syringe capable of being preloaded with medicine comprises a syringe barrel, a needle head and a plunger, and is characterized by further comprising a needle head cap;
the needle head comprises a double-ended needle and a tail sleeve, the tail section of the double-ended needle is inserted into the tail sleeve, the end part of the double-ended needle is close to the sleeve opening of the tail sleeve, the tail sleeve is sleeved on the outlet of the needle cylinder, and the outlet of the needle cylinder is provided with a sealing membrane;
the front end of the syringe is provided with a matching part with a circular wall structure, the matching part surrounds the periphery of the outlet of the syringe, the needle head cap is screwed on the outer side of the matching part and is used for covering the needle head, a convex structure is arranged in the needle head cap along the central axis, and the convex structure is provided with a pore passage for the double-ended needle to pass through;
when the needle head cap is screwed backwards, the convex structure is contacted with the tail sleeve and pushes the tail sleeve to be completely sleeved on the outlet of the needle cylinder, and meanwhile, the tail end of the double-ended needle can pierce the sealing membrane;
the matching part is provided with an external thread; the inner wall of the needle head cap is provided with an internal thread matched with the external thread and can be covered outside the matching part in a threaded manner; the matching part consists of two semicircular walls, and a gap is reserved between the two semicircular walls;
the syringe also comprises a plurality of dose limiting pieces, wherein each dose limiting piece comprises a vertical part and a transverse part which are connected into a whole, the vertical part is of a column groove structure used for being clamped on the rod part of the plunger, and the transverse part is of a sheet structure used for blocking the tail part of the syringe.
2. The needle stick wound prevention syringe of claim 1 wherein the ferrule defines an annular projection around the circumference of the ferrule opening; the cooperation portion inner wall is equipped with the holding ring, the holding ring is used for the location of syringe needle, the position of holding ring sets up the standard and does: when the tail sleeve is sleeved on the outlet of the needle cylinder and the annular bulge does not cross the positioning ring, the double-ended needle does not puncture the sealing membrane; when the annular bulge passes over the positioning ring, the double-ended needle pierces the sealing membrane.
3. The needle stick injury prevention syringe of claim 1 wherein the number of the drug quantity limiting pieces is greater than two.
4. The needle stick wound prevention syringe of claim 1 wherein the outer wall of the barrel is graduated.
5. The pre-filled needle stick resistant syringe of claim 1 wherein the needle cap is provided with non-slip threads on the outer surface.
6. The pre-filled needle stick resistant syringe of claim 5 wherein the non-slip threads are axially raised.
7. The needle stick resistant pre-filled drug syringe of claim 1 wherein the needle cap forward end is spherical and the projection structure projects outwardly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010207509.9A CN111450355B (en) | 2020-03-23 | 2020-03-23 | Needle-prick-proof injector capable of pre-loading medicine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010207509.9A CN111450355B (en) | 2020-03-23 | 2020-03-23 | Needle-prick-proof injector capable of pre-loading medicine |
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| Publication Number | Publication Date |
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| CN111450355A CN111450355A (en) | 2020-07-28 |
| CN111450355B true CN111450355B (en) | 2022-05-10 |
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