CN113975544B - Needleless injector with adjustable injection dosage - Google Patents
Needleless injector with adjustable injection dosage Download PDFInfo
- Publication number
- CN113975544B CN113975544B CN202111235161.5A CN202111235161A CN113975544B CN 113975544 B CN113975544 B CN 113975544B CN 202111235161 A CN202111235161 A CN 202111235161A CN 113975544 B CN113975544 B CN 113975544B
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- locking
- injection
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- gun barrel
- injection head
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- 238000002347 injection Methods 0.000 title claims abstract description 95
- 239000007924 injection Substances 0.000 title claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 239000003814 drug Substances 0.000 claims abstract description 52
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 6
- 230000001960 triggered effect Effects 0.000 claims abstract 2
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229940079593 drug Drugs 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007920 subcutaneous administration Methods 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
- A61M5/30—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
- A61M5/3007—Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules with specially designed jet passages at the injector's distal end
-
- 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
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
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 invention relates to the technical field of syringes, in particular to a needleless syringe with adjustable injection dosage, which comprises a shell, a balance valve, a cylinder barrel arranged in the shell, a piston slidably arranged in the cylinder barrel, an injection head assembly for placing liquid medicine and a plunger rod for pushing the injection head assembly to perform injection, wherein the plunger rod is fixedly connected with the front end of the piston, an energy storage cavity and a control cavity are respectively arranged at the front side and the rear side of a valve core of the balance valve, the injection head assembly is axially and adjustably arranged at the front end of the shell, a locking mechanism for locking the injection head assembly is arranged on the shell, and a second elastic element for pushing the injection head assembly to reset after the piston is triggered is arranged in the cylinder barrel.
Description
Technical Field
The invention relates to the technical field of syringes, in particular to a needleless syringe with adjustable injection dosage.
Background
Along with the development of science and technology, china becomes one of the few countries capable of producing needleless injectors worldwide, and mainly utilizes the high-pressure jet principle to enable liquid medicine to form thinner liquid flow to instantaneously penetrate skin to reach the subcutaneous part, so that the injection has the advantages of uniform liquid medicine diffusion, quick acting time, high medicine absorption rate, small wound and the like;
In this regard, chinese patent application No. CN 202110240947.X discloses a needleless injector, which mainly comprises a balance valve, an energy storage cavity, a control cavity, a piston and a control valve, however, the piston adopts gas reset after injection, only a single injection dose can be applied, and the injected dose cannot be adjusted.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problem that the injection dosage cannot be adjusted due to the fact that the needleless injector in the prior art is reset by adopting gas, the needleless injector with adjustable injection dosage is provided.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an injection dose adjustable needleless injector, includes casing, balanced valve, the cylinder of setting in the casing, slidable mounting in the cylinder the piston, be used for placing the injection head subassembly of liquid medicine and be used for promoting the ram that the injection head subassembly was injected, ram and the front end fixed connection of piston, both sides are provided with energy storage chamber and control chamber respectively around the case of balanced valve, and the case supports the rear end tip of cylinder under the effect of first elastic element, the axially adjustable front end at the casing of installing of injection head subassembly, install the locking mechanism who is used for locking the injection head subassembly on the casing, be provided with the second elastic element that is used for promoting its reduction after the piston fires in the cylinder.
In this scheme with injection head subassembly position adjustable install on the casing to can change the distance between piston and the injection head subassembly, combine the design that second elastic element promotes the piston to reset again, so can realize adjusting injection dosage, and simple structure, the fault rate is low, and life is high.
The present invention specifically provides two types of injector head assemblies:
One of two types of injector head assemblies is: the injection head assembly comprises a gun barrel and an injection head fixed at the front end of the gun barrel, a push rod in transmission connection with a ram is arranged in the gun barrel in a sliding manner, an injection one-way mechanism is arranged at the front end of the gun barrel, a liquid medicine cavity is formed between the injection one-way mechanism and the push rod in the gun barrel, the injection one-way mechanism is used for allowing liquid in the liquid medicine cavity to flow towards the injection head, a liquid inlet connector communicated with the liquid medicine cavity is arranged on the gun barrel, and a liquid inlet one-way mechanism used for allowing liquid medicine at an inlet of the liquid inlet connector to flow towards the liquid medicine cavity is arranged at the position of the liquid inlet connector;
the gun barrel is in threaded connection with the shell, and the locking mechanism is used for locking the gun barrel of the injection head assembly.
Further, the locking mechanism comprises a locking nut and a locking sleeve, a notch is formed in the peripheral wall of the locking sleeve, the notch extends along one end of the locking sleeve to the other end of the locking sleeve, the locking sleeve is sleeved outside the gun barrel, the locking nut is in threaded connection with the shell, an inner inclined surface which is inclined outwards from front to back is arranged in the locking nut, and the inner inclined surface is in contact with the outer wall of the locking sleeve.
Further, an outer inclined surface which is inclined outwards from front to back is arranged on the outer peripheral wall of the locking sleeve, and the inner inclined surface is in contact with the outer inclined surface.
Further, a connecting sleeve is arranged between the collision rod and the push rod, one of the collision rod and the push rod is fixedly connected with one end of the connecting sleeve, a second limiting protrusion is arranged on the other one of the collision rod and the push rod, a first limiting protrusion is arranged on the other end of the connecting sleeve, the second limiting protrusion is slidably arranged in the connecting sleeve, and the first limiting protrusion is opposite to the second limiting protrusion.
Further, a plurality of long grooves are formed in the end, located at the first limiting protrusion, of the connecting sleeve at intervals along the circumferential direction of the end.
Another of the two types of injector head assemblies is: the injection head assembly comprises a medicine core and a push rod which is slidably arranged in the medicine core, the front end of the shell is in threaded connection with an adjusting sleeve, the push rod and the plunger rod are both positioned in the adjusting sleeve and are opposite to each other, and the medicine core is fixedly connected with the adjusting sleeve; the locking mechanism is used for locking the adjusting sleeve.
Further, the locking mechanism comprises a locking nut and a locking sleeve, a notch is formed in the peripheral wall of the locking sleeve, the notch extends along one end of the locking sleeve to the other end of the locking sleeve, the locking sleeve is sleeved outside the adjusting sleeve, the locking nut is in threaded connection with the shell, an inner inclined surface which is inclined outwards from front to back is arranged in the locking nut, and the inner inclined surface is in contact with the outer wall of the locking sleeve.
Further, an outer inclined surface which is inclined outwards from front to back is arranged on the outer peripheral wall of the locking sleeve, and the inner inclined surface is in contact with the outer inclined surface.
Further, the second elastic element is a spring, one end of the second elastic element is propped against the shell, and the other end is propped against the front end of the piston.
The beneficial effects of the invention are as follows: the injection head component of the needleless injector with adjustable injection dose is arranged on the shell in an adjustable position, so that the distance between the piston and the injection head component can be changed, and the design that the piston is pushed to reset by combining with the second elastic element is combined, so that the injection dose can be adjusted, and the needleless injector has the advantages of simple structure, low failure rate and long service life.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a front view of the adjustable dose needleless injector of example 1;
FIG. 2 is a cross-sectional view of the adjustable dose needleless injector of example 1;
FIG. 3 is an enlarged partial view of portion A of FIG. 2;
FIG. 4 is a schematic view showing the case of example 1 in which the striker, the push rod and the connecting sleeve are fitted to each other;
fig. 5 is a three-dimensional view of the connecting sleeve in example 1;
FIG. 6 is a three-dimensional view of the lock sleeve of example 1;
FIG. 7 is a three-dimensional view of the adjustable dose needleless injector of example 2;
FIG. 8 is a cross-sectional view of the adjustable dose needleless injector of example 2;
FIG. 9 is an enlarged partial view of portion B of FIG. 8;
in the figure: 1. the device comprises a shell, 2, a balance valve, 201, a valve core, 202, a first elastic element, 3, a cylinder barrel, 4, a piston, 5, an injection head assembly, 6, a plunger, 6-1, a second limit protrusion, 7, an energy storage cavity, 8, a control cavity, 9, a barrel, 10, an injection head, 11, a push rod, 12, an injection unidirectional mechanism, 13, a liquid medicine cavity, 14, a liquid inlet connector, 15 and a liquid inlet unidirectional mechanism;
16. the locking nut, 16-1, inner inclined plane, 17, locking sleeve, 17-1, outer inclined plane, 17-2, notch, 18, connecting sleeve, 18-1, first limit protrusion, 18-2, long groove, 19, medicine core, 20, adjusting sleeve, 21, second elastic element.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only those features which are relevant to the invention, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
Example 1
As shown in fig. 1-6, an injection dose adjustable needleless injector comprises a shell 1, a balance valve 2, a cylinder 3 arranged in the shell 1, a piston 4 slidably arranged in the cylinder 3, an injection head assembly 5 for placing liquid medicine and a plunger 6 for pushing the injection head assembly 5 to perform injection, wherein the plunger 6 is fixedly connected with the front end of the piston 4, the plunger 6 can be specifically and fixedly connected with the front end and the rear end of the piston 4 by threads, an energy storage cavity 7 and a control cavity 8 are respectively arranged on the front side and the rear side of a valve core 201 of the balance valve 2, the valve core 201 is propped against the rear end of the cylinder 3 under the action of a first elastic element 202, the injection head assembly 5 is axially and adjustably arranged at the front end of the shell 1, and a locking mechanism for locking the injection head assembly 5 is arranged in the shell 1, and a second elastic element 21 for pushing the plunger 4 to reset after firing is configured in the cylinder 3.
The second elastic element 21 is a spring, and one end of the second elastic element 21 abuts against the housing 1, and the other end abuts against the front end of the piston 4.
The injection head assembly 5 comprises a gun barrel 9 and an injection head 10 fixed at the front end of the gun barrel 9, a push rod 11 in transmission connection with the plunger rod 6 is slidably arranged in the gun barrel 9, an injection one-way mechanism 12 is arranged at the front end of the gun barrel 9, a liquid medicine cavity 13 is formed between the injection one-way mechanism 12 and the push rod 11 in the gun barrel), the injection one-way mechanism 12 is used for allowing liquid in the liquid medicine cavity 13 to flow towards the injection head 10, a liquid inlet joint 14 communicated with the liquid medicine cavity 13 is arranged on the gun barrel 9, and a liquid inlet one-way mechanism 15 used for allowing liquid medicine at the inlet of the liquid inlet joint 14 to flow towards the liquid medicine cavity 13 is arranged at the liquid inlet joint 14; in this embodiment, the injection unidirectional mechanism 12 and the liquid inlet unidirectional mechanism 15 may both use unidirectional valves;
the gun barrel 9 is in threaded connection with the housing 1, and the locking mechanism is used for locking the gun barrel 9 of the injector head assembly 5.
The locking mechanism comprises a locking nut 16 and a locking sleeve 17, a notch 17-2 is formed in the peripheral wall of the locking sleeve 17, and the notch 17-2 extends along the direction from one end to the other end of the locking sleeve 17; the locking sleeve 17 is sleeved outside the gun barrel 9, the locking nut 16 is in threaded connection with the shell 1, an inner inclined surface 16-1 which is inclined outwards from front to back is arranged in the locking nut 16, and the inner inclined surface 16-1 is in contact with the outer wall of the locking sleeve 17; when the lock nut 16 is screwed on the shell 1, the inner inclined surface 16-1 of the lock nut 16 can prop against the lock sleeve 17, so that the lock sleeve 17 tightly holds the gun barrel 9, and the gun barrel 9 is prevented from loosening in the firing process of the piston 4; the locking sleeve 17 is made of elastic material, such as plastic.
The outer peripheral wall of the locking sleeve 17 is provided with an outer inclined surface 17-1 which is inclined outwards from front to back, and the inner inclined surface 16-1 is contacted with the outer inclined surface 17-1; thereby better locking the gun barrel 9 and ensuring that the injection is successfully completed.
A connecting sleeve 18 is arranged between the striker rod 6 and the push rod 11, one of the striker rod 6 and the push rod 11 is fixedly connected with one end of the connecting sleeve 18, the other one is provided with a second limiting protrusion 6-1, the other end of the connecting sleeve 18 is provided with a first limiting protrusion 18-1, the second limiting protrusion 6-1 is slidably arranged in the connecting sleeve 18, and the first limiting protrusion 18-1 is opposite to the second limiting protrusion 6-1; namely, the connecting sleeve 18 has two mounting modes;
The first is: a connecting sleeve 18 is arranged between the striker 6 and the push rod 11, the connecting sleeve 18 is fixedly connected with the push rod 11, a first limiting protrusion 18-1 is arranged at the rear end inside the connecting sleeve 18, a second limiting protrusion 6-1 is arranged at the front end of the striker 6, the second limiting protrusion 6-1 is slidably arranged in the connecting sleeve 18, and the first limiting protrusion 18-1 is opposite to the second limiting protrusion 6-1; by means of the arrangement of the connecting sleeve 18, the rear end part of the push rod 11 and the front end part of the plunger rod 6 form a section of impact distance, the injection effect of liquid medicine is improved, and when the plunger 4 is reset, the connecting sleeve 18 and the push rod 11 can move backwards along with the plunger rod 6 only when the plunger rod 6 moves backwards until the first limiting protrusion 18-1 and the second limiting protrusion 6-1 are contacted, so that the impact distance of the plunger rod 6 is ensured to be constant.
The second is: a connecting sleeve 18 is arranged between the striker 6 and the push rod 11, the connecting sleeve 18 is fixedly connected with the striker 6, a first limiting protrusion 18-1 is arranged at the front end inside the connecting sleeve 18, a second limiting protrusion 6-1 is arranged at the rear end of the push rod 11, the second limiting protrusion 6-1 is slidably arranged in the connecting sleeve 18, and the first limiting protrusion 18-1 is opposite to the second limiting protrusion 6-1; by means of the arrangement of the connecting sleeve 18, the rear end part of the push rod 11 and the front end part of the plunger rod 6 form a section of impact distance, the injection effect of liquid medicine is improved, and when the plunger 4 is reset, the connecting sleeve 18 and the push rod 11 can move backwards along with the plunger rod 6 only when the plunger rod 6 moves backwards until the first limiting protrusion 18-1 and the second limiting protrusion 6-1 are contacted, so that the impact distance of the plunger rod 6 is ensured to be constant.
In the embodiment, scales can be arranged outside the gun barrel 9 so as to accurately adjust the single injection dosage;
the rear end of the connecting sleeve 18 is provided with a plurality of long grooves 18-2 at intervals along the circumferential direction, so that the connecting sleeve 18 is positioned between two adjacent long grooves 18-2 and has certain elasticity, and the second limit bulge 6-1 of the striker 6 is conveniently arranged in the connecting sleeve 18; the connecting sleeve 18 is made of an elastic material, such as plastic, and further can be made of nylon.
The firing principle of the piston 4 in this embodiment is shown in detail in a needleless injector disclosed in chinese patent with application number 202110240947.X, and in this embodiment, the description is omitted, in contrast, the reset cavity is omitted in this embodiment, and instead, the spring is used to reset the piston 4;
The injection head assembly 5 in this embodiment can realize continuous injection and can also realize adjustable injection dosage, specifically:
Before injection, by rotating the gun barrel 9, the distance between the rear end of the gun barrel 9 and the front end of the piston 4 is changed, and the larger the distance between the rear end of the gun barrel 9 and the front end of the piston 4 is, the larger the stroke of the piston 4 is, and the more medicinal liquid in the medicinal liquid cavity 13 is; the smaller the distance between the rear end of the gun barrel 9 and the front end of the piston 4 is, the smaller the stroke of the piston 4 is, the smaller the liquid medicine in the liquid medicine cavity 13 is, and then the injection dosage is adjusted, namely, when the piston 4 moves forwards to be in contact with the gun barrel 9, one injection can be completed; after the position of the barrel 9 has been adjusted, the lock nut 16 is tightened.
During injection, the liquid inlet connector 14 is communicated with a container storing liquid medicine to be injected, the piston 4 pushes the ram 6, after one end of the ram 6 moves forwards to impact a distance, the ram 11 is driven, the ram 11 pushes liquid in the liquid medicine cavity 13, the liquid is enabled to pass through the injection unidirectional mechanism 12 and be ejected out of the injection head 10 at a high speed, high-speed jet is formed, and when the step of the ram 6 contacts with the rear end of the gun barrel 9, the piston 4 stops moving, so that injection is completed; the second elastic element 21 is compressed and stored in the injection process, so that after injection, the second elastic element 21 pushes the piston 4 to reset backward, the push rod 11 moves backward, and the liquid is sucked from the liquid inlet one-way mechanism 15 to enter the liquid medicine cavity 13 in the resetting process, so that preparation is made for the next injection, and continuous multiple injections can be realized.
Example 2
As shown in fig. 7 to 9, embodiment 2 differs from embodiment 1 in that: the injection head assembly 5 comprises a medicine core 19 and a push rod 11 which is slidably arranged in the medicine core 19, an adjusting sleeve 20 is connected to the front end of the shell 1 in a threaded manner, the push rod 11 and the plunger 6 are both positioned in the adjusting sleeve 20 and are opposite to each other to form an impact distance, and the medicine core 19 is fixedly connected with the adjusting sleeve 20; the locking mechanism is used to lock the adjustment sleeve 20.
In this embodiment, the adjusting sleeve 20 may be provided with graduations to facilitate accurate adjustment of the single injection dose.
The locking mechanism comprises a locking nut 16 and a locking sleeve 17, a notch 17-2 is formed in the peripheral wall of the locking sleeve 17, the notch 17-2 extends along the direction from one end to the other end of the locking sleeve 17, the locking sleeve 17 is sleeved outside the adjusting sleeve 20, the locking nut 16 is in threaded connection with the shell 1, an inner inclined surface 16-1 inclining outwards from front to back is arranged in the locking nut 16, and the inner inclined surface 16-1 is in contact with the outer wall of the locking sleeve 17.
The outer peripheral wall of the locking sleeve 17 is provided with an outer inclined surface 17-1 inclined outwards from front to back, and the inner inclined surface 16-1 is in contact with the outer inclined surface 17-1.
In the embodiment, the length of the adjusting sleeve 20 extending into the cylinder barrel 3 is changed according to the dosage of the liquid medicine in the medicine core 19 before injection; the more the medicine liquid in the medicine core 19, the more the position of the push rod 11 in the medicine core 19 is, the less the medicine liquid in the medicine core 19 is, and the more the position of the push rod 11 in the medicine core 19 is;
Before injection, the distance between the rear end of the adjusting sleeve 20 and the front end of the piston 4 is changed according to the dosage of the traditional Chinese medicine liquid in the medicine core 19, so that the impact distance between the push rod 11 of the medicine core 19 and the ram 6 is kept constant; after the position of the adjustment sleeve 20 is adjusted, the lock nut 16 is tightened.
When in injection, the piston 4 pushes the plunger rod 6, after the plunger rod 6 moves forward by one end to impact a distance, the push rod 11 is driven, the push rod 11 pushes the liquid in the drug core 19, and the liquid is ejected from the front end of the drug core 19 at a high speed to form a high-speed jet, so that the injection is completed; wherein, the second elastic element 21 is compressed and stored energy during injection, so that after injection, the second elastic element 21 pushes the piston 4 to reset, and the push rod 11 moves backwards to reset.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. The utility model provides an injection dose adjustable needleless injector, includes casing (1), balanced valve (2), sets up cylinder (3) in casing (1), slidable mounting piston (4) in cylinder (3), is used for placing injection head subassembly (5) of liquid medicine and is used for promoting ram (6) that injection head subassembly (5) carry out the injection, ram (6) and the front end fixed connection of piston (4), both sides are provided with energy storage chamber (7) and control chamber (8) respectively around the case (201) of balanced valve (2), and case (201) support the rear end tip of cylinder (3) under the effect of first elastic element (202), its characterized in that: the injection head assembly (5) is axially and adjustably arranged at the front end of the shell (1), a locking mechanism for locking the injection head assembly (5) is arranged on the shell (1), and a second elastic element (21) for pushing the piston (4) to reset after being triggered is arranged in the cylinder barrel (3);
The injection head assembly (5) comprises a gun barrel (9) and an injection head (10) fixed at the front end of the gun barrel (9), a push rod (11) in transmission connection with a ram (6) is arranged in the gun barrel (9) in a sliding mode, an injection one-way mechanism (12) is arranged at the front end of the gun barrel (9), a liquid medicine cavity (13) is formed between the injection one-way mechanism (12) and the push rod (11) in the gun barrel (9), the injection one-way mechanism (12) is used for allowing liquid in the liquid medicine cavity (13) to flow towards the injection head (10), a liquid inlet connector (14) is arranged on the gun barrel (9), and a liquid inlet one-way mechanism (15) used for allowing liquid medicine at an inlet of the liquid inlet connector (14) to flow towards the liquid medicine cavity (13) is arranged at the position of the liquid inlet connector (14);
The gun barrel (9) is in threaded connection with the shell (1), and the locking mechanism is used for locking the gun barrel (9) of the injection head assembly (5); the locking mechanism comprises a locking nut (16) and a locking sleeve (17), wherein a notch (17-2) is formed in the peripheral wall of the locking sleeve (17), the notch (17-2) extends along the direction from one end of the locking sleeve (17) to the other end, the locking sleeve (17) is sleeved outside the gun barrel (9), the locking nut (16) is in threaded connection with the shell (1), an inner inclined surface (16-1) which is inclined outwards from front to back is arranged in the locking nut (16), and the inner inclined surface (16-1) is in contact with the outer wall of the locking sleeve (17);
Or the injection head assembly (5) comprises a medicine core (19) and a push rod (11) which is slidably arranged in the medicine core (19), the front end of the shell (1) is connected with an adjusting sleeve (20) in a threaded manner, the push rod (11) and the plunger (6) are both positioned in the adjusting sleeve (20) and are opposite to each other, and the medicine core (19) is fixedly connected with the adjusting sleeve (20); the locking mechanism is used for locking the adjusting sleeve (20); the locking mechanism comprises a locking nut (16) and a locking sleeve (17), a notch (17-2) is formed in the peripheral wall of the locking sleeve (17), the notch (17-2) extends along the direction from one end of the locking sleeve (17) to the other end, the locking sleeve (17) is sleeved outside the adjusting sleeve (20), the locking nut (16) is in threaded connection with the shell (1), an inner inclined surface (16-1) inclining outwards from front to back is arranged in the locking nut (16), and the inner inclined surface (16-1) is in contact with the outer wall of the locking sleeve (17).
2. The adjustable injection dose needleless injector of claim 1, wherein: the outer peripheral wall of the locking sleeve (17) is provided with an outer inclined surface (17-1) which is inclined outwards from front to back, and the inner inclined surface (16-1) is contacted with the outer inclined surface (17-1).
3. The adjustable injection dose needleless injector of claim 1, wherein: the novel anti-collision device is characterized in that a connecting sleeve (18) is arranged between the collision rod (6) and the push rod (11), one of the connecting sleeve (18) and the push rod (11) is fixedly connected with one end of the connecting sleeve (18), a second limiting protrusion (6-1) is arranged on the other one of the connecting sleeve (18) and the push rod, a first limiting protrusion (18-1) is arranged on the other end of the connecting sleeve (18), the second limiting protrusion (6-1) is slidably arranged in the connecting sleeve (18), and the first limiting protrusion (18-1) is opposite to the second limiting protrusion (6-1).
4. A needleless injector with adjustable injection dosage as claimed in claim 3, in which: the connecting sleeve (18) is positioned at the end of the first limiting protrusion (18-1) and provided with a plurality of long grooves (18-2) at intervals along the circumferential direction.
5. The adjustable injection dose needleless injector of claim 1, wherein: the second elastic element (21) is a spring, one end of the second elastic element (21) is propped against the shell (1), and the other end is propped against the front end of the piston (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111235161.5A CN113975544B (en) | 2021-10-22 | 2021-10-22 | Needleless injector with adjustable injection dosage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111235161.5A CN113975544B (en) | 2021-10-22 | 2021-10-22 | Needleless injector with adjustable injection dosage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113975544A CN113975544A (en) | 2022-01-28 |
| CN113975544B true CN113975544B (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111235161.5A Active CN113975544B (en) | 2021-10-22 | 2021-10-22 | Needleless injector with adjustable injection dosage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113975544B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984379B (en) * | 2022-05-18 | 2024-02-09 | 浙江工业大学 | High-pressure driven needleless injection device |
| CN115154766B (en) * | 2022-06-21 | 2023-10-20 | 江苏乐聚医药科技有限公司 | Self-energizing device for needleless injector |
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