Dosed needle-free syringe

Abstract

The present invention provides a quantitative needle-free syringe, comprising a medicine core assembly, a handle sleeve and a stepping piston assembly; an impact rod is provided on the rear end face of the syringe push 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 forward; a non-return locking combination for locking and unlocking the impact rod and the handle sleeve is provided between the impact rod and the inner wall of the handle sleeve, the stepping piston assembly comprises a cylinder sleeve, a pneumatic piston and a main impact rod; a magnet and a magnet seat are fixed at the rear end of the pneumatic piston. The present invention has a reasonable structural design, can effectively stop and lock the impact rod, and realizes step-by-step excitation of the impact rod through the stepping piston assembly inside, the excitation is good, the pressure of the drug solution is stable, and the quantitative injection effect is excellent.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, in particular to the technical field of syringes, and in particular to a quantitative needle-free syringe. Background Art

[0002] Needle-free injection, also known as jet injection, is a medical device that uses the instantaneous high pressure generated by a power source to form a high-speed, high-pressure jet stream through the nozzle of the syringe drug, thereby allowing the drug to penetrate the outer layer of the skin to the subcutaneous, intradermal and other tissue layers to release its efficacy. At present, the existing needle-free syringes are usually controlled by hydraulics, and cannot effectively achieve the quantitative injection of a dose of liquid medicine in batches. During the injection process, there is also the problem of poor locking of the impact rod, resulting in insufficient liquid medicine pressure, which affects the normal operation of the needle-free injection. It is necessary to improve the design of the needle-free syringe in response to the existing situation to meet the use requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the prior art, the present invention provides a quantitative needle-free syringe with a reasonable structural design, a pneumatic method, stable excitation, no prone to poor locking of the impact rod, and avoids insufficient liquid pressure, and is easy to use.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a quantitative needle-free syringe, comprising a medicine core assembly, a handle sleeve and a stepping piston assembly arranged in the handle sleeve; the medicine core assembly is arranged at the front end of the handle sleeve, the medicine core assembly comprises a medicine core outer sleeve and a syringe push rod, and the front end of the syringe push rod is inserted into the medicine core outer sleeve; the rear end surface of the syringe 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 forward; a non-return locking combination for locking and unlocking the impact rod and the handle sleeve is provided 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 impact rod, the cylinder outer sleeve Fixed on the inner circumference of the handle sleeve, the pneumatic piston is movably connected in the cylinder sleeve, an air cavity is provided between the pneumatic piston and the cylinder sleeve, the pneumatic piston is hollow inside and has an inner cavity, the tail end of the pneumatic piston is connected with a pneumatic quick connector, the front end is fixed with a piston plug, and the pneumatic quick connector is connected with the air path of the air cavity; a piston magnet seat is fixed at the rear end of the pneumatic piston, a cylinder magnet seat is fixed in the cylinder sleeve corresponding to the rear end of the piston magnet seat, the opposing surfaces of the piston magnet seat and the cylinder magnet seat are both concave and have a magnet cavity, a magnet is provided in the magnet cavity, and a magnetic isolation sleeve is provided between the outer circumference of the magnet and the inner wall of the magnet cavity, and the rear end of the cylinder magnet seat is connected to the pneumatic quick connector.

[0005] Furthermore, the non-return locking combination includes a locking sleeve and a steel ball; the locking sleeve is in a conical sleeve structure and is arranged between the outer circumference of the impact rod and the inner circumference of the handle sleeve, the front end diameter of the inner wall of the conical sleeve is larger than the rear end diameter, and the steel ball is arranged between the outer circumference of the impact rod and the inner wall of the conical sleeve, and the handle sleeve is also rotatably connected with an unlocking sleeve, the front end of the unlocking sleeve is abutted against the rear end surface of the locking sleeve, and the front end surface of the unlocking sleeve also protrudes with a boss that pushes the steel ball forward when the unlocking sleeve is rotated.

[0006] Furthermore, the rear end of the impact rod is concave and has an impact cavity, the front end of the main impact rod extends out of the piston plug and extends into the impact cavity, and a return spring is elastically connected between the tail end of the core assembly and the piston plug; a one-way transmission mechanism is provided between the rear end of the piston plug and the main impact rod for pushing the main impact rod and the pneumatic piston forward synchronously, and an annular groove is also provided at the tail end of the main impact rod, a damping sleeve is embedded in the annular groove, and the outer peripheral surface of the damping sleeve is interference fit with the inner wall of the pneumatic piston.

[0007] Preferably, the pneumatic piston drives the main impact rod to move through a one-way transmission mechanism, and the one-way transmission mechanism includes a main locking spring and a retaining sleeve; the main impact rod contacts the rear end of the impact rod during 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 is arranged around the main impact rod; the retaining sleeve is sleeved on the main impact rod and the front end plane of the retaining sleeve extends outward and has a circumferentially outwardly protruding mating ear, the piston sleeve is outside the retaining sleeve and the main impact rod, and the front end of the piston has a mating groove for the mating ear to extend out, and the rear end face of the mating ear is crimped with the bottom of the mating groove; The outer circumference of the retaining sleeve is provided with a plurality of oblong holes, each of which is provided with a steel ball. The surface of the main impact rod is provided with lower embedded grooves corresponding to the positions of the oblong holes, and the radial cross-section of the lower embedded groove is an arc-shaped surface adapted to the outer circumferential surface of the steel ball. The inner wall of the piston at the position corresponding to the oblong hole is a conical sleeve structure with a front end radius greater than a rear end radius relative to the outer circumferential surface of the main impact rod, the rear end surface of the conical sleeve contacts and abuts against the rear end of the steel ball, and the inner wall of the conical sleeve corresponding to the steel ball also has an arc-shaped surface matching the contact surface of the steel ball. The steel ball is in linear contact with the main impact rod and the inner wall of the piston, and a spring wire is elastically connected between the front end of the steel ball and the retaining sleeve.

[0008] Furthermore, the magnet is locked and fixed with the corresponding piston magnet seat or cylinder magnet seat by bolts.

[0009] The beneficial effect of the present invention is that the quantitative needle-free syringe provided by the present invention has a reasonable structural design, can effectively lock the impact rod, and realizes step-by-step excitation of the impact rod through a step-by-step piston assembly inside, with good excitation, stable drug liquid pressure, and excellent quantitative injection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 It is a structural schematic diagram of the best embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of the one-way transmission mechanism in the optimal embodiment of the present invention after the pneumatic piston is removed.

[0013] Figure 3 It is a schematic diagram of a one-way transmission mechanism including a pneumatic piston in the optimal embodiment of the present invention.

[0014] Figure 4 It is a structural schematic diagram of the non-return locking combination in the optimal embodiment of the present invention.

[0015] In the figure, 1, handle sleeve 2, medicine core sleeve 3, syringe push rod 4, impact rod 5, main impact rod 6, pneumatic piston 7, cylinder sleeve 8, air cavity 9, pneumatic quick connector 10, piston plug 11, piston magnet seat 12, cylinder magnet seat 13, magnet 14, magnetic isolation sleeve 15, locking sleeve 16, check steel ball 17, unlocking sleeve 18, boss 19, impact cavity 20, reset spring 21, damping sleeve 22, main locking spring 23, retaining sleeve 24, matching ear 25, matching groove 26, spring wire 27, lower embedded groove 28, locking steel ball 29, arc surface. DETAILED DESCRIPTION

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] like Figures 1 to 4 The quantitative needle-free syringe shown is the best embodiment of the present invention, and comprises a medicine core assembly, a handle cover 1 and a stepping piston assembly arranged in the handle cover 1.

[0018] The medicine core assembly is arranged at the front end of the handle sleeve 1 , and the medicine core assembly comprises a medicine core outer sleeve 2 and a syringe push rod 3 , and the front end of the syringe push rod 3 is inserted into the medicine core outer sleeve 2 .

[0019] The rear end face of the syringe push rod 3 is provided with an impact rod 4, the step piston assembly is arranged at the rear end of the impact rod 4, and the step piston assembly pushes the impact rod 4 to move forward; 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 includes a locking sleeve 15 and a steel ball; the locking sleeve 15 is a conical sleeve structure, and is arranged between the outer circumference of the impact rod 4 and the inner circumference of the handle sleeve 1, the front end diameter of the inner wall of the conical sleeve is larger than the rear end diameter, and the steel ball is arranged between the outer circumference of the impact rod 4 and the inner wall of the conical sleeve, and the handle sleeve 1 is also rotatably connected with an unlocking sleeve 17, the front end of the unlocking sleeve 17 is against the rear end face of the locking sleeve 15, and the front end face of the unlocking sleeve 17 also protrudes with a boss 18 that pushes the steel ball to move forward when the unlocking sleeve 17 is rotated.

[0020] The stepping piston assembly includes a main striker 5, a piston and a cylinder jacket 7. The stepping piston assembly includes a cylinder jacket 7, a pneumatic piston 6 and a main striker 5. The cylinder jacket 7 is fixed on the inner circumference of the handle sleeve 1. The pneumatic piston 6 is movably connected in the cylinder jacket 7. An air cavity 8 is provided between the pneumatic piston 6 and the cylinder jacket 7. The pneumatic piston 6 is hollow inside and has an inner cavity. The tail end of the pneumatic piston 6 is connected with a pneumatic quick connector 9, and the front end is fixed with a piston plug 10. The pneumatic quick connector 9 is in air communication with the air cavity 8. A piston magnet seat 11 is fixed at the rear end of the pneumatic piston 6. A cylinder magnet seat 12 is fixed at the rear end corresponding to the piston magnet seat 11 in the cylinder jacket 7. The opposing surfaces of the piston magnet seat 11 and the cylinder magnet seat 12 are both concave and have a magnet cavity. A magnet 13 is provided in the magnet cavity, and a magnetic isolation sleeve 14 is provided between the outer circumference of the magnet 13 and the inner wall of the magnet cavity. The rear end of the cylinder magnet seat 12 is connected with the pneumatic quick connector 9. In order to facilitate the fixing of the magnet 13 to the corresponding magnet seat, the magnet 13 is locked and fixed to the corresponding piston magnet seat 11 or cylinder magnet seat 12 by bolts.

[0021] In the actual design, the rear end of the impact rod 4 is concave with 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 core assembly and the piston plug 10; there is a one-way transmission mechanism between the rear end of the piston plug 10 and the main impact rod 5 to push the main impact rod 5 and the pneumatic piston 6 forward synchronously, and the tail end of the main impact rod 5 is also provided with an annular groove, and a damping sleeve 21 is embedded in the annular groove, and the outer peripheral surface of the damping sleeve 21 is interference fit with the inner wall of the pneumatic piston 6. During operation, the main impact rod 5 excites the impact rod 4 through the energy storage in the impact cavity 19. In the early stage, the pneumatic piston 6 moves forward, and the friction force of the damping sleeve 21 drives the main impact rod 5 forward, forming a certain inertia. When the main impact rod 5 hits the impact rod 4 to pressurize, it can better provide forward force, which is conducive to pressurizing the liquid medicine.

[0022] The pneumatic piston 6 drives the main impact rod 5 to move through a one-way transmission mechanism, and the one-way transmission mechanism includes a main locking spring 22 and a retaining sleeve 23; the main impact rod 5 contacts the rear end of the impact rod 4 during 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 is arranged around the main impact rod 5; the retaining sleeve 23 is sleeved on the main impact rod 5 and the front end plane of the retaining sleeve 23 extends outward and has a circumferentially outwardly protruding mating ear 24, the piston sleeve is outside the retaining sleeve 23 and the main impact rod 5, and the front end of the piston has a mating groove 25 for the mating ear 24 to extend, and the rear end face of the mating ear 24 is press-fitted with the groove bottom of the mating groove 25 The outer circumference of the retaining sleeve 23 is provided with a plurality of oblong holes 26, each of which is provided with a steel ball. The surface of the main striker 5 is provided with lower embedded grooves 27 corresponding to the positions of the oblong holes 26. The radial cross section of the lower embedded grooves 27 is an arcuate surface 29 adapted to the outer circumferential surface of the steel ball. The inner wall of the piston corresponding to the oblong hole 26 is a conical sleeve structure with a front end radius greater than a rear end radius relative to the outer circumferential surface of the main striker 5. The rear end surface of the conical sleeve contacts and abuts against the rear end of the steel ball, and the inner wall of the conical sleeve corresponds to the steel ball and also has an arcuate surface 29 matched with the contact surface of the steel ball. The steel ball 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 steel ball and the retaining sleeve 23. The design of line contact makes the contact more stable, the locking is reliable and the strength is high.

[0023] Working process:

[0024] The pneumatic quick connector 9 is ventilated. Under the action of air pressure, the magnets in the piston magnet seat 11 and the cylinder magnet seat 12 are separated, and the pneumatic piston 6 is unlocked from the cylinder jacket 7 as a whole. The pneumatic piston 6 is pushed forward by the air pressure. At this time, the pneumatic piston 6 moves forward. At this time, the main striker 5 moves forward synchronously with the pneumatic piston 6 under the action of the damping sleeve 21 until the front end of the main striker 5 is against the impact rod 4. At this time, the piston continues to move forward, and the matching groove 25 is crimped with the matching ear 24, driving the retaining sleeve 23 to move forward synchronously. Through the action of the steel ball of the one-way transmission mechanism, the main striker 5 is synchronously driven to continue to move forward. The main striker 5 hits the impact rod 4, and the impact rod 4 pushes the syringe push rod 3 forward to achieve the injection of the liquid medicine. In this process, the check locking combination locks the impact rod 4, and the impact rod 4 will not move backward even if there is no forward pressure from the main striker 5. The main striker 5 hits the impact rod 4 multiple times under the action of air pressure, forming a step-by-step process of injecting the liquid medicine. When the injection is completed and the syringe push rod 3 needs to be recovered, the unlocking sleeve 17 can be rotated accordingly. When the unlocking sleeve 17 rotates, it pushes the steel ball of the non-return locking assembly to move forward. The steel ball is no longer pressed on the impact rod 4, completing the unlocking of the impact rod 4. The impact rod 4 can retreat and return under the elastic force of the auxiliary locking spring.

[0025] The quantitative needle-free syringe designed in this way has a reasonable structural design, can effectively lock the impact rod 4, and realizes step-by-step excitation of the impact rod 4 through a step-by-step piston assembly inside, with good excitation, stable drug liquid pressure, and excellent quantitative injection effect.

[0026] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A quantitative needle-free syringe, characterized in that: The invention comprises a medicine core assembly, a handle sleeve (1) and a stepping piston assembly arranged in the handle sleeve (1); the medicine core assembly is arranged at the front end of the handle sleeve (1), the medicine core assembly comprises a medicine core outer sleeve (2) and a syringe push rod (3), the front end of the syringe push rod (3) is inserted into the medicine core outer sleeve (2); the rear end surface of the syringe 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 forward; a non-return locking assembly for locking and unlocking the impact rod (4) and the handle sleeve (1) is provided 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 striker (5), the cylinder outer sleeve (7) is fixed on the inner circumferential surface of the handle sleeve (1), and the pneumatic piston (6) is movably connected to the cylinder outer sleeve (7). The pneumatic piston (6) is connected to the cylinder sleeve (7), and an air cavity (8) is provided between the pneumatic piston (6) and the cylinder sleeve (7). The pneumatic piston (6) is hollow inside and has an inner cavity. The tail end of the pneumatic piston (6) is connected to a pneumatic quick connector (9), and the front end is fixed with a piston plug (10). The pneumatic quick connector (9) is in air communication with the air cavity (8). The rear end of the pneumatic piston (6) is fixed with a piston magnet seat (11), and a cylinder magnet seat (12) is fixed in the cylinder sleeve (7) corresponding to the rear end of the piston magnet seat (11). The opposing surfaces of the piston magnet seat (11) and the cylinder magnet seat (12) are both concave and have a magnet cavity. A magnet (13) is provided in the magnet cavity, and a magnetic isolation sleeve (14) is provided between the outer peripheral surface of the magnet (13) and the inner wall of the magnet cavity. The rear end of the cylinder magnet seat (12) is connected to the pneumatic quick connector (9). The non-return locking assembly comprises a locking sleeve (15) and a non-return steel ball (16); the locking sleeve (15) is in 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 front end diameter of the inner wall of the conical sleeve is larger than the rear end diameter; 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 also 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); the front end surface of the unlocking sleeve (17) also protrudes and has a boss (18) for pushing the non-return steel ball (16) to move forward when the unlocking sleeve (17) is rotated.

2. The quantitative needle-free injector according to claim 1, characterized in that: The rear end of the impact rod (4) is concave and has 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 rear end of the core assembly and the piston plug (10); a one-way transmission mechanism is provided between the rear end of the piston plug (10) and the main impact rod (5) for pushing the main impact rod (5) and the pneumatic piston (6) forward synchronously, and an annular groove is also provided at the rear end of the main impact rod (5), and a damping sleeve (21) is embedded in the annular groove, and the outer peripheral surface of the damping sleeve (21) is interference fit with the inner wall of the pneumatic piston (6).

3. The quantitative needle-free injector according to claim 2, characterized in that: The pneumatic piston (6) drives the main impact rod (5) to move through a one-way transmission mechanism, and the one-way transmission mechanism includes a main locking spring (22) and a retaining sleeve (23); the main impact rod (5) contacts the rear end of the impact rod (4) during 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 is arranged around the main impact rod (5); the retaining sleeve (23) is sleeved on the main impact rod (5), and the front end plane of the retaining sleeve (23) extends outward and has a circumferential outwardly protruding mating ear (24); the pneumatic piston (6) is sleeved outside the retaining sleeve (23) and the main impact rod (5), and the front end of the pneumatic piston (6) has a mating groove (25) for the mating ear (24) to extend, and the rear end surface of the mating ear (24) is pressed against the groove bottom of the mating groove (25); the retaining sleeve (23) A plurality of oblong holes (26) are formed on the outer circumference, each oblong hole (26) containing a locking steel ball (28). The surface of the main striker (5) is provided with lower embedded grooves (27) at positions corresponding to the oblong holes (26). The radial cross section of the lower embedded grooves (27) is an arcuate surface (29) matched with the outer circumferential surface of the locking steel ball (28). The inner wall of the pneumatic piston (6) at the position corresponding to the oblong hole (26) is a tapered sleeve structure with a front end radius greater than a rear end radius relative to the outer circumferential surface of the main striker (5). The rear end surface of the tapered sleeve contacts and abuts against the rear end of the locking steel ball (28), and the inner wall of the tapered sleeve corresponding to the locking steel ball (28) also has an arcuate surface (29) matched with the contact surface of the steel ball. The locking steel ball (28) is in line contact with the main striker (5) and the inner wall of the pneumatic piston (6). A spring wire (30) is elastically connected between the front end of the locking steel ball (28) and the retaining sleeve (23).

4. The quantitative needle-free injector according to claim 1, characterized in that: The magnet is locked and fixed to the corresponding piston magnet seat (11) or cylinder magnet seat (12) by means of bolts.

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