CN212439613U

CN212439613U - Quantitative needleless injector

Info

Publication number: CN212439613U
Application number: CN202021896486.9U
Authority: CN
Inventors: 支前锋; 徐浩宇; 张春莉; 张亚德; 李海飞; 刘鑫; 刘靖
Original assignee: MEDICAL INTERNATIONAL TECHNOLOGIES (MIT CANADA) Inc
Current assignee: MEDICAL INTERNATIONAL TECHNOLOGIES (MIT CANADA) Inc
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-02-02
Anticipated expiration: 2030-09-02

Abstract

The utility model provides a quantitative needleless injector, which comprises a medicine core component, a handle sleeve and a stepping piston component; the rear end face of the injector push rod is provided with an impact rod, the stepping piston assembly is arranged at the rear end of the impact rod, and the stepping piston assembly pushes the impact rod to move forwards; a non-return locking combination for locking and unlocking the impact rod and the handle sleeve is arranged between the impact rod and the inner wall of the handle sleeve, and the stepping piston assembly comprises a cylinder outer sleeve, a pneumatic piston and a main impact rod; and a magnet seat are fixed at the rear end of the pneumatic piston. The utility model has the advantages of reasonable design, can effectively carry out the stopping locking to the impact rod, inside realizes arousing the marching type of impact rod through marching type piston assembly, arouses well, liquid medicine pressure stability, and quantitative injection effect is excellent.

Description

Quantitative needleless injector

Technical Field

The utility model relates to the technical field of medical equipment, in particular to an injector, in particular to a quantitative needleless injector.

Background

The needleless injection is also called jet injection, and is a medical apparatus and device which utilizes instantaneous high pressure generated by a power source to enable medicine in an injector to form high-speed and high-pressure jet flow through a nozzle, so that the medicine penetrates through the outer layer of the skin to the tissue layers of subcutaneous tissue, intradermal tissue and the like to release the medicine effect. At present, the existing needleless injectors are generally controlled by hydraulic pressure, and the fractional quantitative injection of one dose of liquid medicine cannot be effectively realized. In the injection process, the impact rod is not well locked, the liquid medicine pressure is insufficient, and the normal operation of needle-free injection is influenced. There is a need for an improved needleless injector design that addresses the needs of the prior art.

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 quantitative needleless injector which has reasonable structural design, adopts a pneumatic mode, is stable in simultaneous excitation, is not easy to cause bad locking of an impact rod, avoids insufficient pressure of liquid medicine and is convenient to use.

The utility model provides a technical scheme that its technical problem adopted is: a quantitative needleless injector comprises a medicine core component, a handle sleeve and a stepping piston component arranged in the handle sleeve; the drug core assembly is arranged at the front end of the handle sleeve and comprises a drug core outer sleeve and an injector push rod, and the front end of the injector push rod is inserted into the drug core outer sleeve; the rear end face of the injector push rod is provided with an impact rod, the stepping piston assembly is arranged at the rear end of the impact rod, and the stepping piston assembly pushes the impact rod to move forwards; a non-return locking combination for locking and unlocking the impact rod and the handle sleeve is arranged between the impact rod and the inner wall of the handle sleeve, the stepping piston assembly comprises a cylinder outer sleeve, a pneumatic piston and a main ram, the cylinder outer sleeve is fixed on the inner circumferential surface of the handle sleeve, the pneumatic piston is movably connected in the cylinder outer sleeve, an air cavity is formed between the pneumatic piston and the cylinder outer sleeve, an inner cavity is formed in the interior of the pneumatic piston in a hollow mode, 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, and the pneumatic quick connector is communicated with an air channel of the air cavity; the pneumatic piston rear end be fixed with piston magnet seat, the cylinder overcoat in correspond piston magnet seat rear end and be fixed with cylinder magnet seat, piston magnet seat and cylinder magnet seat opposite face all indent have a magnet chamber, the magnet intracavity be equipped with magnet, and have a magnetism isolating sleeve between magnet outer peripheral face and the magnet intracavity wall, cylinder magnet seat rear end be connected with pneumatic quick-operation joint.

Furthermore, the non-return locking combination comprises a locking sleeve and a steel ball; the locking sleeve is of a conical sleeve structure and is arranged between the outer peripheral surface of the impact rod and the inner peripheral surface of the handle sleeve, the diameter of the front end of the inner wall of the conical sleeve is larger than that of the rear end, the steel ball is arranged between the outer peripheral surface of the impact rod and the inner wall of the conical sleeve, the handle sleeve is further rotatably connected with an unlocking sleeve, the front end of the unlocking sleeve abuts against the rear end face of the locking sleeve, and the front end face of the unlocking sleeve is further protruded with a boss which can push the steel ball to move forwards when the unlocking sleeve is rotated.

Furthermore, the rear end of the impact rod is recessed inwards to form an impact cavity, the front end of the main impact rod 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.

Preferably, the pneumatic piston drives the main ram to move through a one-way transmission mechanism, and the one-way transmission mechanism comprises a main locking spring and a retaining sleeve; the main striking rod is contacted with the rear end of the impact rod in the forward movement and drives the impact rod to move forward, and the main locking spring is elastically connected between the piston plug and the retaining sleeve and arranged around the main striking rod; the retaining sleeve is sleeved outside the main impact rod, the plane of the front end of the retaining sleeve extends outwards and is provided with a matching lug protruding outwards in the circumferential direction, the piston is sleeved outside the retaining sleeve and the main impact rod, the front end of the piston is provided with a matching groove for the matching lug to extend out, and the rear end surface of the matching lug is in compression joint with the groove bottom of the matching groove; the retaining sleeve is characterized in that a plurality of long round holes are formed in the periphery of the retaining sleeve, a steel ball is arranged in each long round hole, lower embedded grooves are formed in the surfaces of the main collision rods corresponding to the positions of the long round holes respectively, the radial sections of the lower embedded grooves are arc-shaped surfaces matched with the outer circular surfaces of the steel balls, the inner wall of the piston corresponding to the position of the long round holes is of a conical sleeve structure, the radius of the front end of the conical sleeve structure is larger than that of the rear end of the conical sleeve structure, relative to the periphery of the main collision rods, the rear end face of the conical sleeve is in contact and abutting contact with the rear end of the steel ball, the inner wall of the conical sleeve corresponding to the steel ball is also provided with an arc-shaped surface matched with the contact surface of the steel ball.

Furthermore, the magnet is locked and fixed with the corresponding piston magnet seat or the corresponding cylinder magnet seat through a bolt.

The beneficial effects of the utility model are that, the utility model provides a quantitative needleless injector, structural design is reasonable, can effectively carry out the stopping locking to the impact rod, and inside realizes arousing the marching type of impact rod through marching type piston assembly, arouses well, and liquid medicine pressure is stable, and quantitative injection effect is excellent.

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.

Fig. 2 is a schematic diagram of the one-way transmission mechanism with the pneumatic piston removed in the preferred embodiment of the present invention.

Fig. 3 is a schematic diagram of the one-way transmission mechanism including a pneumatic piston according to the preferred embodiment of the present invention.

Fig. 4 is a schematic structural view of the check lock assembly in the preferred embodiment of the present invention.

In the figure 1, a handle sleeve 2, a medicine core outer sleeve 3, an injector push rod 4, an impact rod 5, a main impact rod 6, a pneumatic piston 7, a cylinder outer sleeve 8, an air cavity 9, a pneumatic quick joint 10, a piston plug 11, a piston magnet seat 12, a cylinder magnet seat 13, a magnet 14, a magnetism isolating sleeve 15, a locking sleeve 16, a check steel ball 17, an unlocking sleeve 18, a boss 19, an impact cavity 20, a reset spring 21, a damping sleeve 22, a main locking spring 23, a retaining sleeve 24, a matching lug 25, a matching groove 26, a spring wire 27, a lower caulking groove 28, a locking steel ball 29 and an arc-shaped surface.

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.

The quantitative needleless injector shown in fig. 1 to 4 is the preferred embodiment of the present invention, and comprises a drug core assembly, a handle sleeve 1 and a stepping piston assembly arranged in the handle sleeve 1.

The drug core component is arranged at the front end of the handle sleeve 1, the drug core component comprises a drug core outer sleeve 2 and an injector push rod 3, and the front end of the injector push rod 3 is inserted into the drug core outer sleeve 2.

The rear end face of the injector push rod 3 is provided with an impact rod 4, the stepping piston assembly is arranged at the rear end of the impact rod 4, and the stepping piston assembly pushes the impact rod 4 to move forwards; and a non-return locking combination for locking and unlocking the impact rod 4 and the handle sleeve 1 is arranged between the impact rod 4 and the inner wall of the handle sleeve 1. The non-return locking combination comprises a locking sleeve 15 and a steel ball; the locking sleeve 15 is of a conical sleeve structure and is arranged between the outer peripheral surface of the impact rod 4 and the inner peripheral surface of the handle sleeve 1, the diameter of the front end of the inner wall of the conical sleeve is larger than that of the rear end, the steel ball is arranged between the outer peripheral surface of the impact rod 4 and the inner wall of the conical sleeve, the handle sleeve 1 is further rotatably connected with an unlocking sleeve 17, the front end of the unlocking sleeve 17 abuts against the rear end surface of the locking sleeve 15, and a boss 18 which pushes the steel ball to move forwards when the unlocking sleeve 17 is rotated is further protruded on the front end surface of the unlocking sleeve 17.

The stepping piston assembly comprises a main collision rod 5, a piston and a cylinder sleeve 7, the stepping piston assembly comprises the cylinder sleeve 7, a pneumatic piston 6 and the main collision rod 5, the cylinder sleeve 7 is fixed on the inner peripheral surface of the handle sleeve 1, the pneumatic piston 6 is movably connected in the cylinder sleeve 7, an air cavity 8 is arranged between the pneumatic piston 6 and the cylinder sleeve 7, an inner cavity is arranged in the pneumatic piston 6 in a hollow manner, a pneumatic quick connector 9 is connected to the tail end of the pneumatic piston 6, a piston plug 10 is fixed at the front end of the pneumatic piston, and the pneumatic quick connector 9 is communicated with the air cavity 8; 6 rear ends of pneumatic piston be fixed with piston magnet seat 11, cylinder overcoat 7 in correspond 11 rear ends of piston magnet seat and be fixed with cylinder magnet seat 12, piston magnet seat 11 and the equal indent of 12 opposite faces of cylinder magnet seat have a magnet chamber, the magnet intracavity be equipped with magnet 13, and magnet 13 outer peripheral face and magnet intracavity wall between have magnetism-

isolating sleeve

14, 12 rear ends of cylinder magnet seat be connected with pneumatic quick-operation joint 9. In order to fix the magnets 13 to the corresponding magnet bases, the magnets 13 are fastened to the corresponding piston magnet bases 11 or cylinder magnet bases 12 by bolts.

In the practical design, the rear end of the impact rod 4 is recessed inwards to form an impact cavity 19, the front end of the main impact rod 5 extends out of the piston plug 10 and extends into the impact cavity 19, and a return spring 20 is elastically connected between the tail end of the medicine core assembly and the piston plug 10; the piston stopper 10 rear end and main lance 5 between have and promote main lance 5 and pneumatic piston 6 synchronous forward one-way drive mechanism, 5 tail ends of main lance still open the ring channel, the ring channel embedded damping cover 21, damping cover 21 outer peripheral face and the interference fit of pneumatic piston 6 inner wall. When the pneumatic impact mechanism works, the main impact rod 5 is excited to excite the impact rod 4 through energy storage of the impact cavity 19, the early pneumatic piston 6 moves forwards, the main impact rod 5 is driven to move forwards through the friction force of the damping sleeve 21, certain inertia is formed, when the main impact rod 5 impacts the impact rod 4 to pressurize, the forward force can be better provided, and the liquid medicine is favorably pressurized.

The pneumatic piston 6 drives the main striking rod 5 to move through a one-way transmission mechanism, and the one-way transmission mechanism comprises a main locking spring 22 and a retaining sleeve 23; the main striker 5 contacts with the rear end of the impact rod 4 in the forward movement and drives the impact rod 4 to move forward, and the main locking spring 22 is elastically connected between the piston plug 10 and the retaining sleeve 23 and arranged around the main striker 5; the retaining sleeve 23 is sleeved on the main striker 5, the plane of the front end of the retaining sleeve 23 extends outwards and is provided with a matching lug 24 protruding outwards in the circumferential direction, the piston is sleeved outside the retaining sleeve 23 and the main striker 5, the front end of the piston is provided with a matching groove 25 for the matching lug 24 to extend out, and the rear end surface of the matching lug 24 is in compression joint with the groove bottom of the matching groove 25; the outer periphery of the retaining sleeve 23 is provided with a plurality of long circular holes 26, a steel ball is arranged in each long circular hole 26, the surface of the main striking rod 5 is correspondingly provided with lower embedded grooves 27 corresponding to the positions of the long circular holes 26, the radial sections of the lower embedded grooves 27 are arc-shaped surfaces 29 matched with the outer circular surfaces of the steel balls, the inner wall of the position of the piston corresponding to the long circular holes 26 is of a conical sleeve structure, the radius of the front end of the inner wall is larger than that of the outer periphery of the main striking rod 5, the rear end surface of the conical sleeve is in contact with the rear end of the steel ball, the inner wall of the conical sleeve is provided with the arc-shaped surface 29 matched with the contact surface of the steel ball corresponding to the steel ball, the steel ball is in line contact with the main striking rod 5 and the inner wall of the piston, and the spring. The design of line contact makes the contact more stable, and locking is reliable and intensity is high.

The working process is as follows:

the pneumatic quick connector 9 is ventilated, under the action of air pressure, the magnet in the piston magnet seat 11 and the magnet in the cylinder magnet seat 12 are separated, and the whole pneumatic piston 6 is unlocked with the cylinder outer sleeve 7. The pneumatic piston 6 is pushed forward by air pressure, the pneumatic piston 6 moves forward, the main ram 5 moves forward synchronously with the pneumatic piston 6 under the action of the damping sleeve 21 until the front end of the main ram 5 abuts against the impact rod 4, the piston continues to move forward, the matching groove 25 is in compression joint with the matching lug 24 to drive the retaining sleeve 23 to move forward synchronously, the main ram 5 is driven to move forward synchronously under the action of a steel ball of the one-way transmission mechanism, the main ram 5 impacts the impact rod 4, and the impact rod 4 pushes the injector push rod 3 to move forward, so that injection of liquid medicine is realized. In the process, the impact rod 4 is locked by the non-return locking combination, and the impact rod 4 cannot retreat even if the forward pressure of the main impact rod 5 is not available. The main striking rod 5 strikes the impact rod 4 for a plurality of times under the action of air pressure, and a step-by-step liquid medicine injection process is formed. When the injection is finished and the push rod 3 of the injector needs to be recovered, the unlocking sleeve 17 can be correspondingly rotated, the unlocking sleeve 17 pushes the steel ball of the non-return locking combination to move forwards when rotating, the steel ball is not pressed on the impact rod 4 any more, the unlocking of the impact rod 4 is finished, and the impact rod 4 can retreat and return under the elastic force action of the auxiliary locking spring.

The quantitative needleless injector designed in this way is reasonable in structural design, can effectively perform backstop locking on the impact rod 4, and is internally excited by stepping of the impact rod 4 through the stepping piston assembly, so that the injection is good in excitation, stable in liquid medicine pressure and excellent in quantitative injection effect.

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

1. A metered dose needleless injector, comprising: comprises a medicine core component, a handle sleeve (1) and a stepping piston component arranged in the handle sleeve (1); the drug core assembly is arranged at the front end of the handle sleeve (1), the drug core assembly comprises a drug core outer sleeve (2) and an injector push rod (3), and the front end of the injector push rod (3) is inserted into the drug core outer sleeve (2); the rear end face of the injector push rod (3) is provided with an impact rod (4), the stepping piston assembly is arranged at the rear end of the impact rod (4), and the stepping piston assembly pushes the impact rod (4) to move forwards; a non-return locking combination for locking and unlocking the impact rod (4) and the handle sleeve (1) is arranged between the impact rod (4) and the inner wall of the handle sleeve (1), the stepping piston assembly comprises a cylinder outer sleeve (7), a pneumatic piston (6) and a main impact rod (5), the cylinder outer sleeve (7) is fixed on the inner circumferential surface of the handle sleeve (1), the pneumatic piston (6) is movably connected in the cylinder outer sleeve (7), an air cavity (8) is formed between the pneumatic piston (6) and the cylinder outer sleeve (7), an inner cavity is formed in the interior of the pneumatic piston (6), a pneumatic quick connector (9) is connected to the tail end of the pneumatic piston (6), a piston plug (10) is fixed at the front end of the pneumatic piston (6), and the pneumatic quick connector (9) is communicated with the air cavity (8); pneumatic piston (6) rear end be fixed with piston magnet seat (11), cylinder overcoat (7) in correspond piston magnet seat (11) rear end and be fixed with cylinder magnet seat (12), piston magnet seat (11) and the equal indent of cylinder magnet seat (12) opposite face have a magnet chamber, the magnet chamber in be equipped with magnet (13), and magnet (13) outer peripheral face and magnet intracavity wall between have magnetism spacer sleeve (14), cylinder magnet seat (12) rear end be connected with pneumatic quick-operation joint (9).

2. The dosing needleless injector of claim 1, wherein: the check locking combination comprises a locking sleeve (15) and a check steel ball (16); the locking sleeve (15) is of a conical sleeve structure and is arranged between the outer peripheral surface of the impact rod (4) and the inner peripheral surface of the handle sleeve (1), the diameter of the front end of the inner wall of the conical sleeve is larger than that of the rear end of the inner wall of the conical sleeve, the steel ball is arranged between the outer peripheral surface of the impact rod (4) and the inner wall of the conical sleeve, the handle sleeve (1) is further rotatably connected with an unlocking sleeve (17), the front end of the unlocking sleeve (17) abuts against the rear end face of the locking sleeve (15), and the front end face of the unlocking sleeve (17) is further protruded with a boss (18) which can push the non-return steel ball (16) to move forwards when the unlocking sleeve (17) is rotated.

3. The dosing needleless injector of claim 1, wherein: the rear end of the impact rod (4) is concavely provided with an impact cavity (19), the front end of the main impact rod (5) extends out of the piston plug (10) and into the impact cavity (19), and a return spring (20) is elastically connected between the tail end of the medicine core component and the piston plug (10); piston end cap (10) rear end and main lance (5) between have and promote main lance (5) and pneumatic piston (6) synchronous forward one-way drive mechanism, main lance (5) tail end still opened the ring channel, the ring channel embedded damping cover (21), damping cover (21) outer peripheral face and pneumatic piston (6) inner wall interference fit.

4. The dosing needleless injector of claim 3, wherein: the pneumatic piston (6) drives the main impact rod (5) to move through a one-way transmission mechanism, and the one-way transmission mechanism comprises a main locking spring (22) and a retaining sleeve (23); the main striker (5) is in contact with the rear end of the impact rod (4) in the forward movement and drives the impact rod (4) to move forward, and the main locking spring (22) is elastically connected between the piston plug (10) and the retaining sleeve (23) and arranged around the main striker (5); the outer sleeve of the retaining sleeve (23) is sleeved on the main striking rod (5), the plane of the front end of the retaining sleeve (23) extends outwards and is provided with a matching lug (24) protruding outwards in the circumferential direction, the piston is sleeved outside the retaining sleeve (23) and the main striking rod (5), the front end of the piston is provided with a matching groove (25) for the matching lug (24) to extend out, and the rear end surface of the matching lug (24) is in compression joint with the groove bottom of the matching groove (25); a plurality of long round holes (26) are arranged on the periphery of the retaining sleeve (23), a locking steel ball (28) is arranged in each long round hole (26), the surface of the main striking rod (5) is correspondingly provided with a lower caulking groove (27) corresponding to the position of the long round hole (26), the radial section of the lower caulking groove (27) is an arc surface (29) matched with the outer circular surface of the locking steel ball (28), the inner wall of the piston at the position corresponding to the long round hole (26) is in a conical sleeve structure relative to the outer peripheral surface of the main striking rod (5), the radius of the front end of the conical sleeve is larger than that of the rear end of the conical sleeve, the rear end surface of the conical sleeve is in contact and prop against the rear end of the locking steel ball (28), and the inner wall of the conical sleeve is also provided with an arc surface (29) matched with the contact surface of the steel ball corresponding to the locking steel ball (28), the locking steel ball (28) is in line contact with the main striker (5) and the inner wall of the piston, and a spring wire (30) is elastically connected between the front end of the locking steel ball (28) and the retaining sleeve (23).

5. The dosing needleless injector of claim 1, wherein: the magnet is locked and fixed with the corresponding piston magnet seat (11) or the corresponding cylinder magnet seat (12) through a bolt.