CN112546354A

CN112546354A - Needleless injector

Info

Publication number: CN112546354A
Application number: CN202010812452.5A
Authority: CN
Inventors: 张玮; 李峥杰; 李泽阳; 马常泉; 燕云飞; 李道远
Original assignee: Henan Zhenqi Biological Technology Co ltd
Current assignee: Henan Zhenqi Biological Technology Co ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-26

Abstract

The invention relates to a needleless injector, which comprises an ampoule, a lower shell, an upper shell, a push rod and a firing pin, wherein the lower shell is a hollow cylinder; the upper shell and the lower shell are connected by threads, a main spring is arranged between the push rod and the upper shell, a push button is arranged at the upper end of the push rod, a push rod locking structure is arranged between the push rod and the upper shell as well as between the push rod and the push button, and a first annular groove is formed in the inner wall of the push button and used for unlocking the push rod; a button return spring is arranged between the button and the push rod. An operating hand wheel is arranged outside the upper shell, a cylindrical mounting section is arranged at the upper end of the operating hand wheel, the button is positioned in the cylindrical mounting section, a limiting lantern ring is movably sleeved outside the cylindrical mounting section, a clamping structure and a lantern ring reset spring are arranged between the limiting lantern ring and the operating hand wheel, a button locking structure is arranged between the cylindrical mounting section and the outer wall of the button, and a button unlocking structure is arranged on the inner wall of the limiting lantern ring; an end cover is connected above the limiting lantern ring on the cylindrical mounting section. During injection, the limiting lantern ring is firstly pushed downwards to unlock the button, and then the button is pressed to complete the injection process, so that the injection device is convenient to operate.

Description

Needleless injector

Technical Field

The invention relates to the field of medical instruments for injecting liquid medicines, in particular to a needleless injector.

Background

The needleless injector is a medical appliance which does not need a needle head and can prevent a patient from suffering from acupuncture. It applies pressure to the liquid medicine to inject it into the subcutaneous space of the patient through the micropores on the end part in high-pressure dispersion state at high speed. The existing needleless injector mainly comprises a shell, an ampoule is arranged at the lower end of the shell, a micropore is formed in the end part of the ampoule, a push rod and a pressurizing mechanism are arranged in the shell, a firing pin is connected to the lower end of the push rod, a piston extending into the ampoule is arranged on the firing pin, and a roller for driving the firing pin to act to suck the medicine is arranged on the shell. The upper end of the shell is provided with a button, and the shell is provided with a safety lock. Only press the button again when pressing the safety lock, the push rod just can act and jet out the medicine from the ampoule, even the user need use the one hand to operate two action direction mutually perpendicular's button simultaneously and just can accomplish the injection, the operation of being not convenient for, and current needleless injector has the too big problem of pressurization operating force, inconvenient weak patient and old patient use. Meanwhile, after the existing needleless injector is used by injection, the product cannot be completely restored to the original position, the defects of increased precision error and inaccurate administration exist, and potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a needle-free injector convenient to operate, and aims to solve the problem that in the prior art, the pressurizing operation force is too large, and two buttons with mutually perpendicular action directions need to be operated simultaneously by a single hand, so that the operation is inconvenient.

In order to achieve the purpose, the needleless injector adopts the following technical scheme: a needleless injector comprises an upper shell and a lower shell, wherein the lower end of the lower shell is in threaded connection with an ampoule with a micropore, and the upper shell and the lower shell are in threaded connection; the push rod, the upper shell and the button together form a push rod locking structure through a first limiting ball and a first annular groove; the inner wall of the button is provided with a first annular groove for unlocking the push rod; a button return spring is arranged between the button and the guide mounting section; an operating hand wheel is arranged outside the upper shell, a cylindrical mounting section is arranged at the upper end of the operating hand wheel, a button is positioned in the cylindrical mounting section, a limiting lantern ring is sleeved outside the cylindrical mounting section in a downward and upward guiding and moving mode, a clamping structure and a lantern ring reset spring are arranged between the limiting lantern ring and the operating hand wheel, a button locking structure is arranged between the cylindrical mounting section and the outer wall of the button, and a button unlocking structure is arranged on the inner wall of the limiting lantern ring; an end cover is connected to the upper portion of the limiting lantern ring on the cylindrical mounting section and used for limiting the button.

The button locking structure comprises a second annular groove formed in the outer wall of the button, a taper hole is formed in the cylindrical mounting section, a second limiting ball is mounted between the second annular groove and the taper hole, and the button unlocking structure comprises a second annular groove formed in the inner wall of the limiting sleeve ring.

And a spring mounting groove for mounting the lantern ring return spring is arranged between the operating hand wheel and the cylindrical mounting section.

The clamping structure comprises an annular protrusion arranged on the outer groove wall of the spring mounting groove, and the lower end of the limiting lantern ring is provided with a clamping hook which is clamped and matched with the annular protrusion.

And the limiting lantern ring is provided with an anti-skidding structure.

The push rod is also provided with a spring installation section, and the guide installation section is connected with the spring installation section through a threaded structure so that the length of the whole push rod can be adjusted.

The invention has the beneficial effects that: when the device is installed, the push rod and the upper shell are limited through the push rod locking structure, and the main spring is in a compressed state and keeps pressure through the push rod locking structure; the hand wheel is operated by screwing to drive the upper shell, the push rod, the end cover, the limiting lantern ring, the button and the like to integrally move to a proper position, namely, the required injection dosage position is rotated; during injection, the limiting sleeve ring is pushed downwards to compress the sleeve ring reset spring, the limiting sleeve ring is limited and fixed through the clamping structure, and the button is unlocked at the moment; then, the push button is pressed to unlock the push rod locking structure, namely, the push rod and the upper shell are unlocked; at this time, the push rod moves downwards at a high speed under the action of the main spring to push out the liquid medicine in the ampoule, and the liquid medicine is injected under the skin of a patient at a high speed and high pressure. The needleless injector disclosed by the invention is injected in two steps, the limiting lantern ring is pushed downwards and the position of the limiting lantern ring is fixed, the button is unlocked, and the injection process can be completed only by pressing the button. And the arrangement of the operating handwheel reduces the operating force during pressurization, and is suitable for weak and old patients.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a needleless injector of the present invention;

FIG. 2 is a schematic structural view of the putter of FIG. 1;

FIG. 3 is a schematic structural view of the needleless injector of FIG. 1 prior to injection;

fig. 4 is a partially enlarged view of a portion a in fig. 3.

Detailed Description

An embodiment of a needleless injector of the present invention, as shown in fig. 1 to 4, comprises a lower housing 3 having an upper end opened and an upper housing 7 having a lower end opened, the lower end of the lower housing being connected to an ampoule 1, the lower housing having an internal thread section 5 inside, the upper housing having an external thread section 6 threadedly connected to the internal thread section of the lower housing. A push rod is movably arranged in the lower shell up and down, and a main spring 4 is arranged between the push rod and the upper shell. The lower end of the push rod is provided with a limit step 19, and one end of the main spring is pressed on the limit step; the main spring is positioned in the cavity of the upper shell, and the other end of the main spring is pressed against the upper end wall of the cavity of the upper shell. The upper end of the upper shell is provided with an installation barrel 32 communicated with the upper shell, the push rod is provided with a guide installation section 17 which is installed in the installation barrel in a lower-upper guide mode, the push rod is further provided with a spring installation section 18 which is located in the upper shell and used for installing a main spring, and the diameter of the guide installation section is smaller than that of the spring installation section, so that the main spring can be installed conveniently. The guide mounting section 17 and the spring mounting section 18 are connected through a threaded structure, so that the length of the whole push rod can be adjusted, and error accumulation caused by assembling parts together is compensated.

The guide mounting section 17 of the push rod is provided with a first annular groove 31, and the push rod, the upper shell and the button together form a push rod locking structure through a first limiting ball 30 and the first annular groove 31. The push rod locking structure belongs to the prior art, and the specific structure is not described in detail here. The button 14 is movably sleeved on the upper and lower parts of the outer wall of the mounting barrel, and a first annular groove 29 is formed in the inner wall of the button and used for unlocking the push rod. A first return spring 28 is provided between the push button and the guide mounting section.

The outer part of the upper shell is in transmission connection with an operating hand wheel 8, and the outer diameter of the operating hand wheel 8 is larger than that of the lower shell 3, so that the operation of weak and old patients is facilitated. The operation hand wheel is fixedly installed with the cylindrical installation section through a spline for transmission connection. The upper end of the operating hand wheel is provided with a cylindrical mounting section 10, and a button 14 is positioned in the cylindrical mounting section 10. The outside lower and upper guide of tube-shape installation section is equipped with spacing lantern ring 12. A clamping structure and a lantern ring return spring 9 are arranged between the limiting lantern ring 12 and the operating hand wheel 8. A spring installation groove 23 for installing the lantern ring return spring is arranged between the operating hand wheel and the cylindrical installation section. The clamping structure comprises an annular bulge 25 arranged on the outer groove wall of the spring mounting groove, and the lower end of the limiting lantern ring is provided with a clamping hook 24 which is clamped and matched with the annular bulge. Be provided with anti-skidding structure 11 on the spacing lantern ring, anti-skidding structure is for setting up the multichannel antiskid arch on the spacing lantern ring lateral surface. Be provided with button locking structure between tube-shape installation section and the button outer wall, be provided with button unlocking structure on the inner wall of spacing lantern ring. The button locking structure comprises a second annular groove 27 formed in the outer wall of the button, a taper hole 26 is formed in the cylindrical mounting section, and a second limiting ball 16 is mounted between the second annular groove and the taper hole. The button unlocking structure comprises a second annular groove 15 arranged on the inner wall of the limiting lantern ring.

An end cover 13 is connected to the cylindrical mounting section above the limiting lantern ring, and the end cover is connected to the cylindrical mounting section through screws. A limiting structure is arranged between the end cover and the button, the limiting structure is a necking structure, and the button is provided with a step matched with the necking structure limiting stop to prevent the button from falling off. The lower shell is movably provided with a firing pin 20 up and down, the firing pin 20 is in threaded connection with the push rod, and the lower part of the firing pin is provided with a piston 21 extending into the ampoule. The lower shell is provided with a firing pin driving structure for driving the firing pin to rotate to realize ampoule liquid suction and exhaust, the firing pin driving structure belongs to the prior art, the firing pin driving structure is not improved in the invention, and the original firing pin driving structure is still adopted, so that the specific structure of the firing pin driving structure is not detailed in the embodiment, the firing pin driving structure is still driven by one roller 2 to rotate, and a user can finish ampoule medicine suction and exhaust by rotating the roller.

When the pressure-bearing main spring is used, all the components are installed together, the push rod and the upper shell are limited through the push rod locking structure, and at the moment, the main spring is in a compressed state and keeps pressure through the push rod locking structure. The injection device is characterized in that the injection device is integrally moved to a proper position by screwing an operating hand wheel, driving the upper shell, the push rod, the end cover, the limiting lantern ring and the button to rotate to a required injection unit amount, and the firing pin is driven to rotate by the firing pin driving structure to finish the process of sucking injection liquid into the ampoule and exhausting. During injection, the limiting sleeve ring is pushed downwards to compress the sleeve ring reset spring, the limiting sleeve ring is limited and fixed through the clamping structure, the second limiting ball is separated from the second annular groove at the moment, the second limiting ball enters the second annular groove through the taper hole part, and the button is unlocked. Then the push button is pressed, the push rod is unlocked through the push rod unlocking structure, the push rod moves downwards at a high speed under the action of the main spring, and liquid in the ampoule is pushed out from the end micropore 22 at a high speed and a high pressure and is injected under the skin of a patient. The needleless injector disclosed by the invention is injected in two steps, the limiting lantern ring is pushed downwards and the position of the limiting lantern ring is fixed, the button is unlocked, and the injection process can be completed only by pressing the button. And the external diameter of the operation hand wheel is larger, so that the operation is convenient, for example, a diabetic needs to inject insulin every day, the injection process is completed by the patient himself, and the external diameter of the operation hand wheel is larger, so that the operation hand wheel is more suitable for the use of the patient with weak hand feeling or the elderly or the weak body during the operation. Furthermore, the length of the push rod is adjustable, so that the precision setting during assembly is guaranteed, and the push rod adopts a lower limit and an upper limit to guarantee the precise resetting in repeated injection use, so that the injection administration precision in the whole life cycle of the injector is guaranteed, and the use safety of a patient is further guaranteed.

In other embodiments of the invention, the operating handwheel and the upper shell can be in transmission connection through a flat key or a screw; the clamping structure can also be a limiting bulge arranged on the inner wall of the spring mounting groove and a limiting groove arranged on the outer side surface of the end part of the limiting sleeve ring; the limit balls in the button locking structure can also be replaced by spring pins.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A needleless injector comprises an upper shell and a lower shell, wherein the lower end of the lower shell is in threaded connection with an ampoule with a micropore, and the upper shell and the lower shell are in threaded connection; the push rod, the upper shell and the button together form a push rod locking structure through a first limiting ball and a first annular groove; the inner wall of the button is provided with a first annular groove for unlocking the push rod; a button return spring is arranged between the button and the guide mounting section; the method is characterized in that: an operating hand wheel is arranged outside the upper shell, a cylindrical mounting section is arranged at the upper end of the operating hand wheel, a button is positioned in the cylindrical mounting section, a limiting lantern ring is sleeved outside the cylindrical mounting section in a downward and upward guiding and moving mode, a clamping structure and a lantern ring reset spring are arranged between the limiting lantern ring and the operating hand wheel, a button locking structure is arranged between the cylindrical mounting section and the outer wall of the button, and a button unlocking structure is arranged on the inner wall of the limiting lantern ring; an end cover is connected to the upper portion of the limiting lantern ring on the cylindrical mounting section and used for limiting the button.

2. The needle free injector of claim 1, wherein: the button locking structure comprises a second annular groove formed in the outer wall of the button, a taper hole is formed in the cylindrical mounting section, a second limiting ball is mounted between the second annular groove and the taper hole, and the button unlocking structure comprises a second annular groove formed in the inner wall of the limiting sleeve ring.

3. The needle free injector of claim 1, wherein: and a spring mounting groove for mounting the lantern ring return spring is arranged between the operating hand wheel and the cylindrical mounting section.

4. The needle free injector of claim 1, wherein: the clamping structure comprises an annular protrusion arranged on the outer groove wall of the spring mounting groove, and the lower end of the limiting lantern ring is provided with a clamping hook which is clamped and matched with the annular protrusion.

5. The needle free injector of claim 1, wherein: and the limiting lantern ring is provided with an anti-skidding structure.

6. The needle free injector of any of claims 1-5, wherein: the push rod is also provided with a spring installation section, and the guide installation section is connected with the spring installation section through a threaded structure so that the length of the whole push rod can be adjusted.