CN213609008U - Stepped piston assembly for needleless injector - Google Patents
Stepped piston assembly for needleless injector Download PDFInfo
- Publication number
- CN213609008U CN213609008U CN202021899502.XU CN202021899502U CN213609008U CN 213609008 U CN213609008 U CN 213609008U CN 202021899502 U CN202021899502 U CN 202021899502U CN 213609008 U CN213609008 U CN 213609008U
- Authority
- CN
- China
- Prior art keywords
- piston
- impact
- main
- pneumatic
- rod
- 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.)
- Active
Links
Images
Landscapes
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The utility model provides a stepping piston component for a needleless injector, which comprises an air cylinder jacket, a pneumatic piston, an impact rod and a main ram, wherein the tail end of the pneumatic piston is connected with a pneumatic quick joint, the front end of the pneumatic piston is fixed with a piston plug, the main ram is arranged in the pneumatic piston, the front end of the impact rod is contacted and propped against the rear end of a medicine core component, and a reset spring is elastically connected between the tail end of the medicine core component and the piston plug; a one-way transmission mechanism for pushing the main collision rod and the pneumatic piston to move forwards synchronously is arranged between the rear end of the piston plug and the main collision rod, and a damping sleeve is arranged at the tail end of the main collision rod. The utility model has the advantages of reasonable design, main lance and impact bar arouse through the impact chamber, and the impact bar can not roll back after impeling, and main lance is then kick-backed under the reset spring effect to form marching type piston structure, can effectively be applicable to the demand of dividing the injection of many times with the injection liquid medicine in the needleless syringe.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to a needle-free injector, in particular to a stepping piston assembly for the needle-free injector.
Background
The piston assembly in the prior art generally controls the stroke of the piston through a hydraulic system, the piston stroke is controlled to be complex in the hydraulic control process, and the piston reciprocates to cause air suction or excessive liquid medicine injection on the condition that a part of injection is not completely injected at one time, so that the precise control of the liquid medicine injection amount is influenced, so that a stepping piston assembly is necessary to be designed aiming at the condition, and the condition that the injection can be continuously pushed on the basis of the pushing of the previous injection is kept.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to overcome the defects of the prior art, the utility model provides a stepping piston component for a needleless injector, which has reasonable structural design, is convenient to adapt to the injection of a dose of liquid medicine for multiple times and can continue to be pushed on the pushing basis of the last injection.
The utility model provides a technical scheme that its technical problem adopted is: a stepping piston assembly for a needleless injector is installed in the needleless injector, the needleless injector comprises a handle sleeve, a medicine core assembly arranged at the front end of the handle sleeve and a piston assembly for pushing the medicine core assembly, the piston assembly comprises an air cylinder outer sleeve, a pneumatic piston, an impact rod and a main impact rod, the air cylinder outer sleeve is fixed on the inner circumferential surface of the handle sleeve, the pneumatic piston is movably connected in the air cylinder outer sleeve, an air cavity is formed between the pneumatic piston and the air cylinder outer sleeve, an inner cavity is formed in the hollow part of the pneumatic piston, a pneumatic quick connector is connected to the tail end of the pneumatic piston, a piston plug is fixed at the front end of the pneumatic piston, the pneumatic quick connector is communicated with the air cavity, the main impact rod is arranged in the pneumatic piston, the front end of the impact rod is in contact with the rear end of the medicine core assembly, and an impact cavity is recessed in the rear end, the front end of the main ram extends out of the piston plug and into the impact cavity, and a return spring is elastically connected between the tail end of the medicine core assembly and the piston plug; the piston plug rear end and main lance between have the synchronous forward one-way drive mechanism of main lance of promotion and pneumatic piston, main lance tail end still open the ring channel, the ring channel embedded damping cover, damping cover outer peripheral face and pneumatic piston inner wall interference fit.
In the scheme, the piston assembly is skillfully designed, when in use, the main ram excites the impact rod through the energy storage of the impact cavity, the pneumatic piston moves forwards in the early stage and drives the main ram to move forwards through the friction force of the damping sleeve, and after the main ram abuts against the end face of the impact rod through the impact cavity, the main ram is driven by the one-way transmission mechanism to continue moving forwards to push the impact rod to move forwards, so that the injection is completed. After injection, the impact rod is fixed and acted by a return spring, the pneumatic piston is retreated and reset, and simultaneously the impact rod is driven to retreat and reset to form step operation after next operation.
Furthermore, the tail end of the impact cavity is provided with a half screw sleeve which limits the front end of the main collision rod in the impact cavity in a matching mode, and the inner peripheral surface of the half screw sleeve is matched with the outer peripheral surface of the main collision rod.
Furthermore, a plurality of O-shaped rings are arranged between the damping sleeve and the groove bottom of the annular groove, and the damping sleeve can be effectively in interference fit with the inner wall of the pneumatic piston through the O-shaped rings.
Furthermore, a retaining locking mechanism is arranged between the peripheral surface of the front end of the impact rod and the handle sleeve.
The beneficial effects of the utility model are that, the utility model provides a marching type piston assembly for needleless injector, structural design is reasonable, and main lance and impact bar arouse through the impact chamber, and the impact bar can not roll back after impeling, and main lance is then kick-backed under reset spring effect to formed marching type's piston structure, can effectively be applicable to the demand of the interior many times injection of needleless injector with the liquid medicine.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the preferred embodiment of the present invention.
In the figure, the device comprises a handle sleeve 1, a handle sleeve 2, a medicine core component 3, a cylinder outer sleeve 4, a pneumatic piston 5, a main ram 6, an air cavity 7, a pneumatic quick joint 8, a piston plug 9, an impact cavity 10, a return spring 11, a one-way transmission mechanism 12, an annular groove 13, a damping sleeve 14, a half thread sleeve 15, an O-shaped ring 16 and a backstop locking mechanism.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Fig. 1 shows a stepped piston assembly for a needleless injector, which is a preferred embodiment of the present invention, the piston assembly being mounted in the needleless injector. The needleless injector comprises a handle sleeve 1, a medicine core component 2 arranged at the front end of the handle sleeve 1 and a piston component for pushing the medicine core component 2, wherein the piston component comprises a cylinder outer sleeve 3, a pneumatic piston 4, an impact rod 12 and a main impact rod 5, the cylinder outer sleeve 3 is fixed on the inner peripheral surface of the handle sleeve 1, the pneumatic piston 4 is movably connected in the cylinder outer sleeve 3, an air cavity 6 is arranged between the pneumatic piston 4 and the cylinder outer sleeve 3, an inner cavity is arranged in the hollow part of the pneumatic piston 4, a pneumatic quick connector 7 is connected to the tail end of the pneumatic piston 4, a piston plug 8 is fixed at the front end of the pneumatic piston, and the pneumatic quick connector 7 is communicated with the air cavity 6 through an air path.
Be equipped with main lance 5 in the pneumatic piston 4, 12 front ends of impact bars and 2 rear ends of medicine core assembly touch and offset, 12 rear ends of impact bars then the indent has impact chamber 9, 5 front ends of main lance stretch out piston end cap 8 and stretch into impact chamber 9 in, 2 tail ends of medicine core assembly and piston end cap 8 between then elastic connection have reset spring 10. The rear end of the impact cavity 9 is provided with a half threaded sleeve 14 which limits the front end of the main striking rod 5 in the impact cavity 9 in a matching way, and the inner peripheral surface of the half threaded sleeve 14 is matched with the outer peripheral surface of the main striking rod 5.
A retaining locking mechanism 16 is arranged between the outer peripheral surface of the front end of the impact rod 12 and the handle sleeve 1. The retaining locking mechanism 16 can be designed as a locking sleeve pressed between the flux core component 2 and the cylinder jacket 3, the inner wall of the locking sleeve can be designed as a conical surface with a large front part and a small back part, a steel ball is pressed between the conical surface and the outer wall of the impact rod 12, the steel ball is in point contact relative to the conical surface and the outer wall of the impact rod 12, and the front end of the steel ball is also provided with an elastic piece pushing the steel ball backwards. When impact rod 12 moves forward relative to the locking sleeve, the steel ball does not interfere with the forward movement of impact rod 12. When the impact rod 12 stops moving, if no external force is applied, the steel ball is pushed backwards under the action of the elastic piece and is tightly propped between the conical sleeve and the impact rod 12, the impact rod 12 is locked relative to the locking sleeve, and the stopping operation of the impact rod 12 is completed. When the impact rod 12 needs to be unlocked, a small amount of external force is only needed to be applied to push a little steel ball forward, so that the steel ball is not tightly propped between the conical sleeve and the impact rod 12 any more.
A one-way transmission mechanism 11 for pushing the main striking rod 5 and the pneumatic piston 4 to move forwards synchronously is arranged between the rear end of the piston plug 8 and the main striking rod 5. In practical design, the one-way transmission mechanism 11 only needs to be designed to be capable of synchronously moving forward along with the pneumatic piston 4 when the front end of the main striking rod 5 is propped against the impact rod 12. The one-way transmission mechanism 11 may be designed to be a structure capable of locking and fixing the main ram 5 and the pneumatic piston 4, and may be realized by a tapered sleeve, a steel ball and an elastic member with reference to the above-mentioned backstop locking mechanism 16, and the elastic member and the contact state between the sleeve and the ball need to be designed reasonably according to the unlocking force.
The tail end of the main collision rod 5 is also provided with an annular groove, a damping sleeve 13 is embedded in the annular groove, and the peripheral surface of the damping sleeve 13 is in interference fit with the inner wall of the pneumatic piston 4. A plurality of O-shaped rings 15 are further arranged between the damping sleeve 13 and the groove bottom of the annular groove, and the damping sleeve 13 can be effectively in interference fit with the inner wall of the pneumatic piston 4 through the O-shaped rings 15.
When the pneumatic impact mechanism works, the main impact rod 5 is excited by energy storage of the impact cavity 9 in the process of exciting the impact rod 12, and the pneumatic piston 4 moves forwards in the early stage and drives the main impact rod 5 to move forwards by the friction force of the damping sleeve 13 to form certain inertia. After the main ram 5 is abutted against the end face of the impact rod 12 through the impact cavity 9, the one-way transmission mechanism 11 drives the main ram to move forward continuously to push the impact rod 12 to move forward, and injection is completed. After injection, the impact rod 12 is fixed, the impact rod 12 is acted by the return spring 10, the pneumatic piston 4 is retreated and reset, and simultaneously the impact rod 12 is driven to retreat and reset, and the stepping operation is formed after the next operation.
The stepping piston assembly for the needleless injector is reasonable in structural design, the main impact rod 5 and the impact rod 12 are excited through the impact cavity 9, the impact rod 12 cannot return after being pushed, and the main impact rod 5 rebounds under the action of the reset spring 10, so that the stepping piston assembly is formed, and can be effectively suitable for the requirement of injecting the same liquid medicine for multiple times in the needleless injector. And the design of the impact cavity 9 provides a stroke at one end before the main striker 5 advances to contact the impact rod 12, so that the main striker 5 forms forward inertia, the excitation energy is stronger, and the injection effect is favorably improved.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. The utility model provides a marching type piston assembly for needleless injector installs in the needleless injector, the needleless injector include handle cover (1), set up in handle cover (1) front end medicine core subassembly (2), promote the piston assembly of medicine core subassembly (2), its characterized in that: the piston assembly comprises a cylinder outer sleeve (3), a pneumatic piston (4), an impact rod (12) and a main impact rod (5), the cylinder outer sleeve (3) is fixed on the inner circumferential surface of a handle sleeve (1), the pneumatic piston (4) is movably connected in the cylinder outer sleeve (3), an air cavity (6) is arranged between the pneumatic piston (4) and the cylinder outer sleeve (3), an inner cavity is arranged in the pneumatic piston (4) in a hollow manner, a pneumatic quick connector (7) is connected to the tail end of the pneumatic piston (4), a piston plug (8) is fixed at the front end of the pneumatic piston (4), the pneumatic quick connector (7) is communicated with an air channel of the air cavity (6), the main impact rod (5) is arranged in the pneumatic piston (4), the front end of the impact rod (12) is in contact and butt with the rear end of the flux core assembly (2), and the rear end of the impact rod (12) is recessed to form an impact cavity (9), the front end of the main ram (5) extends out of the piston plug (8) and into the impact cavity (9), and a return spring (10) is elastically connected between the tail end of the medicine core component (2) and the piston plug (8); piston end cap (8) rear end and main lance (5) between have and promote main lance (5) and pneumatic piston (4) one-way drive mechanism (11) forward in step, main lance (5) tail end still opened the ring channel, the ring channel embedded damping cover (13), damping cover (13) outer peripheral face and pneumatic piston (4) inner wall interference fit.
2. The stepped piston assembly for a needle free injector of claim 1, wherein: the rear end of the impact cavity (9) is provided with a half threaded sleeve (14) which limits the front end of the main striking rod (5) in the impact cavity (9) in a matching way, and the inner peripheral surface of the half threaded sleeve (14) is matched with the outer peripheral surface of the main striking rod (5).
3. The stepped piston assembly for a needle free injector of claim 1, wherein: and a plurality of O-shaped rings (15) are arranged between the damping sleeve (13) and the groove bottom of the annular groove.
4. The stepped piston assembly for a needle free injector of claim 1, wherein: and a retaining locking mechanism (16) is arranged between the peripheral surface of the front end of the impact rod (12) and the handle sleeve (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021899502.XU CN213609008U (en) | 2020-09-02 | 2020-09-02 | Stepped piston assembly for needleless injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021899502.XU CN213609008U (en) | 2020-09-02 | 2020-09-02 | Stepped piston assembly for needleless injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213609008U true CN213609008U (en) | 2021-07-06 |
Family
ID=76646841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021899502.XU Active CN213609008U (en) | 2020-09-02 | 2020-09-02 | Stepped piston assembly for needleless injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213609008U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975544A (en) * | 2021-10-22 | 2022-01-28 | 江苏益明荣药医疗科技有限公司 | Needleless injector with adjustable injection dose |
| CN114870163A (en) * | 2022-06-06 | 2022-08-09 | 江苏益明荣药医疗科技有限公司 | Gas spring hybrid needleless injector |
| CN113975544B (en) * | 2021-10-22 | 2024-04-30 | 江苏乐聚医药科技有限公司 | Needleless injector with adjustable injection dosage |
-
2020
- 2020-09-02 CN CN202021899502.XU patent/CN213609008U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975544A (en) * | 2021-10-22 | 2022-01-28 | 江苏益明荣药医疗科技有限公司 | Needleless injector with adjustable injection dose |
| CN113975544B (en) * | 2021-10-22 | 2024-04-30 | 江苏乐聚医药科技有限公司 | Needleless injector with adjustable injection dosage |
| CN114870163A (en) * | 2022-06-06 | 2022-08-09 | 江苏益明荣药医疗科技有限公司 | Gas spring hybrid needleless injector |
| CN114870163B (en) * | 2022-06-06 | 2023-12-19 | 江苏乐聚医药科技有限公司 | Air spring mixed needleless injector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6110433B2 (en) | Automatic syringe | |
| JP4358636B2 (en) | Multiple spring supports for syringes | |
| CN109621096B (en) | Medical needleless injector | |
| CN213609008U (en) | Stepped piston assembly for needleless injector | |
| SE8303869D0 (en) | NEEDLELESS JET INJECTOR | |
| ATE285805T1 (en) | AUTOMATIC INJECTOR | |
| TW374019B (en) | Syringe assembly | |
| CN217014948U (en) | Spring reset type needleless injector | |
| CN107158521B (en) | Fixed exhaust and reusable quantitative injection device | |
| CN202665747U (en) | Long-arm syringe | |
| CN220193710U (en) | Needleless injection device | |
| CN111939391A (en) | Gun type needleless injector | |
| CN217286170U (en) | Animal doctor uses long-range injection device | |
| CN212439613U (en) | Quantitative needleless injector | |
| CN109701125B (en) | Pull-back self-locking type injector | |
| CN113975544B (en) | Needleless injector with adjustable injection dosage | |
| CN111905197A (en) | Quantitative needleless injector | |
| CN113975544A (en) | Needleless injector with adjustable injection dose | |
| CN220110204U (en) | Injector capable of quantitatively pushing | |
| CN212439611U (en) | Gun type needleless injector | |
| CN215757329U (en) | Quantitative inoculation gun for liquid bacteria in fermentation tank | |
| CN214343781U (en) | Automatic change piercing depth of blood ball appearance | |
| CN215995142U (en) | Injection mechanism | |
| CN219614599U (en) | Dosage-placeable top injection piston shaft, injection cylinder and injector thereof | |
| CN116603134B (en) | Needleless injector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |