CN205322929U - a needle-free syringe - Google Patents

Abstract

The utility model relates to a needleless injector, which comprises a housin, the casing transversely sets up the activation face, the injection end of casing is equipped with the adapter, be equipped with the piston in the casing, the piston is equipped with the hasp towards the one end of trigger end, the piston cover has compression spring, compression spring is to the elasticity orientation injection end that the piston was applyed, casing trigger end internal rotation is connected with the trigger, the activation face is equipped with the button, trigger afterbody and the laminating of button afterbody, the trigger head is equipped with the trip, when the piston is in the non-activation position, trip and hasp joint, compression spring is in compression state, when the piston is in the activation position, the trip breaks away from with the hasp, the piston removes to the injection end, the button drive trigger rotates and then makes trip and. The utility model discloses utilize the trigger to realize hasp and the release to the piston, simple structure is difficult for the card to die, and the reliability is high, because the button setting is convenient for user's oneself injection at the casing end, and the syringe of being convenient for when injecting is perpendicular with skin, prevents to leak, and injection sound is little.

Description

a needle-free syringe

technical field

The utility model relates to a syringe, in particular to a needle-free syringe.

Background technique

Needle-free injection techniques deliver drugs to a subject without piercing the subject's skin. Some of the benefits of needle-free injectors compared to conventional injections include: reduced risk of needlestick accidents; hazard of spreading disease from reused needles is eliminated; less bleeding or bruising; faster, repeatable dosing; Needle phobia; and better suited for self-injection.

Depending on their specifications, needle-free injection devices may be suitable for subcutaneous, percutaneous or intramuscular use, such as:

A spring-actuated needle-free hypodermic syringe is disclosed in PCT patent application WO2012/154025. The spring is associated with the piston head, slidably housed within the handle of the injector, two of them. "When compressed, the spring is positioned over the open end of the device on the handle, and the opposite open end is connected to the plunger end of the needle-free syringe to keep the fluid being injected. The compressed spring is pivoted instead by the stop of the trigger The opening mounted to the device is held close to the handle. When the trigger is activated the trigger stop is moved from the piston head, stored in the spring force driving the piston head to depress the plunger and force fluid from the nozzle into the subject's skin .A return spring returns the trigger to the non-actuated position.

Many existing needle-free injectors have important limitations. For example, a trigger positioned on the spray side may be inconvenient for self-injection because it may be difficult for the user to hold the syringe perpendicular to the user's skin and hold it steady. When the syringe is not held securely perpendicular to the skin, it can fail or leak during injection. Additionally, the spring force of some injectors is only sufficient to inject small volumes of fluid. Small volume injections may not be suitable for some users/patients. In some injectors, the form factor is fixed and the syringe cannot be altered to increase its spring force for increased dose.

Certain needle-free injectors use non-spring force as a power source, such as compressed gas, electrodynamic or pyrotechnic charges, to drive fluid through a nozzle and into or through a subject's skin or tissue. For example, US Patent 8,734,384 discloses a compressed gas that pushes a piston into a fluid-filled chamber, which pressurizes the fluid and creates a fluid jet that ejects the fluid out of the injection orifice. In this case, activation of the injector is preferably triggered from the device pressed against the patient's skin.

There are also existing needle-free syringes that use balls to lock and activate, but their stuck rate is high, and they cannot be disassembled and repaired by themselves after stuck.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a needle-free injector.

The technical solution adopted by the utility model to solve the technical problem is: a needle-free syringe, including a housing, one end of the housing is the trigger end, the other end of the housing is the injection end, and the axis of the housing is The injection axis, the housing includes an outer surface and an inner surface, the trigger end of the housing is provided with an activation surface transversely, the injection end of the housing is provided with an adapter, and the adapter is used to connect the syringe to facilitate the injection of the syringe. The plunger extends into the injection end of the housing, a piston is arranged in the housing, a piston head is provided at one end of the piston facing the injection end, and a lock is provided at the end of the piston facing the triggering end, and the moving direction of the piston head is in line with the The moving direction of the plunger is collinear, the piston sleeve is provided with a compression spring, and there is a gap between the compression spring and the piston and the inner surface, which facilitates the sliding of the piston in the housing and the expansion and contraction of the compression spring, and the elastic force exerted by the compression spring on the piston is directed towards At the injection end, a trigger is connected to the trigger end of the housing. The activation surface is provided with a button that can be pressed. The tail of the trigger is attached to the tail of the button. A hook, when the piston is in the inactive position, the hook is engaged with the lock, the compression spring is in a compressed state, and when the piston is in the active position, the hook is disengaged from the lock , the piston moves toward the injection end, and the button drives the trigger to rotate, thereby prompting the hook to disengage from the lock.

In the above design, the trigger is used to lock and release the piston, which has a simple structure, is not easy to get stuck, and has high reliability. Since the button is set at the end of the housing, it is convenient for the user to inject himself, and the syringe is perpendicular to the skin during injection, preventing leakage. small volumn.

As a further improvement of this design, the lock includes an annular engagement surface extending radially outward from the injection axis and facing toward the injection end of the casing; the trigger head includes a an engagement surface extending inwardly and facing toward the trigger end of the housing; the engagement surface engages with the engagement surface when the trigger is in the inactive position, and the engagement surface engages when the trigger is in the active position The face and the joint surface are disengaged. High stability, preventing activation under external shaking, high security.

As a further improvement of this design, the engaging surface is an annular inclined surface; the engaging surface is an inclined surface, which is convenient for engaging.

As a further improvement of this design, a return spring is provided inside the trigger end of the housing, and the return spring presses on the tail of the trigger and forces the tail of the trigger to rotate toward the button. The return spring facilitates the rebound of the button and trigger, and improves the stability of the trigger and piston locking.

As a further improvement of this design, the return spring is a spring leaf biased at the tail of the trigger, which has a simple structure, small volume and high reliability.

As a further improvement of this design, a movable safety cover is included to prevent the button from being pressed.

As a further improvement of this design, the safety cover is rotatably connected to the activation surface to prevent misoperation and provide higher safety.

As a further improvement of this design, the inner surface of the casing is provided with a blocking block facing the injection axis and blocking the extension of the compression spring, so as to facilitate the compression of the compression spring.

As a further improvement of this design, the adapter is detachably mechanically connected to the housing, which facilitates disassembly and replacement of parts and is suitable for syringes of different sizes.

As a further improvement of this design, the housing is configured with pistons of different sizes and compression springs.

The beneficial effects of the utility model are: the utility model utilizes the trigger to realize the locking and release of the piston, the structure is simple, it is not easy to be stuck, and the reliability is high. Since the button is arranged at the end of the housing, it is convenient for the user to inject himself, and it is convenient for the syringe when injecting. It is perpendicular to the skin to prevent leakage and the injection sound is quiet.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a perspective view of the utility model.

Fig. 2 is a schematic sectional view of the utility model.

In the figure 1. Housing, 2. Injection end, 3. Trigger end, 4. Adapter, 5. Outer surface, 6. Inner surface, 7. Piston head, 8. Piston, 9. Blocking block, 10. Card Coupling surface, 11. Return spring, 12. Engagement surface, 13. Trigger, 14. Safety cover, 15. Compression spring, 16. Button, 17. Spray axis, 18. Activation surface, 19. Lock, 20. Hook .

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the schematic embodiments and descriptions are only used to explain the utility model, but not as a limitation to the utility model.

Example: The housing 1 and other parts are made of stainless steel, or any other suitable metal (eg galvanized carbon steel) or any other suitable rigid material such as rigid plastic (eg PCEABS plastic) or similar .

The housing 1 can be designed in different sizes according to different ways of use. For example, housing 1 may be sized and shaped to be comfortably held by a user in one hand (eg a cylinder measuring approximately 13 cm long x 1.5 cm diameter).

Users can self-inject, such as in the abdomen, arms, legs, or other locations on the body. Alternatively, the user may be a medical professional or other person injecting the drug into a human or animal subject.

A needle-free injector, comprising a housing 1, one end of the housing 1 is the trigger end 3, the other end of the housing 1 is the injection end 2, the axis of the housing 1 is the injection axis 17, the housing 1 includes an outer surface 5 and an inner surface 6, the trigger end 3 of the housing 1 is provided with an activation surface 18 laterally, the injection end 2 of the housing 1 is provided with an adapter 4, and the adapter 4 is used for connecting a syringe, It is convenient for the plunger of the syringe to extend into the injection end 2 of the housing 1, the housing 1 is provided with a piston 8, the end of the piston 8 facing the injection end 2 is provided with a piston head 7, and the piston 8 is facing the trigger end One end of 3 is provided with a lock catch 19, the moving direction of the piston head 7 is in line with the moving direction of the plunger, the piston 8 is covered with a compression spring 15, and the compression spring 15 and the gap between the piston 8 and the inner surface 6 There is a gap to facilitate the sliding of the piston 8 in the housing 1 and the expansion and contraction of the compression spring 15. The elastic force exerted by the compression spring 15 on the piston 8 is directed towards the injection end 2. A trigger 13 is connected to the trigger end 3 of the housing 1. The activation The surface 18 is provided with a button 16 that can be pressed, and the tail of the trigger 13 is attached to the tail of the button 16. The head of the trigger 13 is provided with a hook 20 that is engaged with the lock 19, and the piston 8 is in an inactive position. , the hook 20 is engaged with the lock 19, the compression spring 15 is in a compressed state, and when the piston 8 is in the activated position, when the hook 20 is disengaged from the lock 19, the The piston 8 moves toward the injection end 2 , and the button 16 drives the trigger 13 to rotate, thereby prompting the hook 20 to disengage from the lock 19 .

For subcutaneous injections, the compression spring 15 can be varied according to the desired depth of penetration. The spring force ranges between 185N and 165N, depending on how much fat is under the skin. A typical non-limiting example of a spring force for intramuscular injection is around 200N.

The material of the compression spring 15 is high carbon spring wire with a wire diameter of 0.4mm, 3.2mm, 9 working coils and 11 total coils, and an average coil diameter of 0.86N/mm spring stiffness.

In the above design, the trigger 13 is used to realize the lock 19 and release of the piston 8. The structure is simple, it is not easy to be stuck, and the reliability is high. Since the button 16 is arranged at the end of the housing 1, it is convenient for the user to self-inject, and it is convenient for the syringe to be perpendicular to the skin during injection. , to prevent leakage, the injection sound is small.

As a further improvement of this design, the lock 19 includes an annular engagement surface 10 extending radially outward from the injection axis 17 and facing toward the injection end 2 of the casing 1; the head of the trigger 13 includes Extending radially inwardly from the spray axis 17 and facing the engaging surface 12 facing the trigger end 3 of the housing 1; when the trigger 13 is in the inactive position, the engaging surface 10 and the engaging surface 12 are in close contact. Engagement, when the trigger 13 is in the activated position, the engagement surface 10 and the engagement surface 12 are engaged and disengaged. High stability, preventing activation under external shaking, high security.

As a further improvement of this design, the engaging surface 10 is an annular inclined surface; the engaging surface 12 is an inclined surface, which is convenient for engaging.

As a further improvement of this design, a return spring 11 is provided inside the trigger end 3 of the housing 1 , and the return spring 11 presses on the tail of the trigger 13 and forces the tail of the trigger 13 to rotate toward the button 16 . The return spring 11 is convenient for the button 16 and the trigger 13 to bounce back, and improves the stability of the trigger 13 and the piston 8 being locked.

As a further improvement of this design, the return spring 11 is a spring leaf biased at the tail of the trigger 13, which has a simple structure, small volume and high reliability.

As a further improvement of this design, it also includes a movable safety cover 14 for preventing the button 16 from being pressed, and the safety cover 14 is inserted on the activation surface 18 for easy removal.

As a further improvement of this design, the safety cover 14 is rotatably connected to the activation surface 18 to prevent misoperation and provide higher safety.

As a further improvement of this design, the inner surface 6 of the casing 1 is provided with a blocking block 9 facing the injection axis 17 and blocking the extension of the compression spring 15 to facilitate the compression of the compression spring 15 .

As a further improvement of this design, the adapter 4 is detachably mechanically connected to the housing 1, which facilitates the disassembly and replacement of components and is suitable for syringes of different sizes.

As a further improvement of this design, the housing 1 is equipped with pistons 8 and compression springs 15 of different sizes.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (10)

1. A needle-free injector, comprising a housing, one end of the housing is the trigger end, and the other end of the housing is the injection end, characterized in that the axis of the housing is the injection axis, and the housing includes The outer surface and the inner surface, the trigger end of the housing is provided with an activation surface transversely, the injection end of the housing is provided with an adapter, and the adapter is used to connect the syringe so that the plunger of the syringe can be inserted into the housing. Injection end, the housing is provided with a piston, the end of the piston facing the injection end is provided with a piston head, the end of the piston facing the trigger end is provided with a lock, and the moving direction of the piston head is collinear with the moving direction of the plunger , the piston sleeve is provided with a compression spring, and there is a gap between the compression spring and the piston and the inner surface, which facilitates the sliding of the piston in the housing and the expansion and contraction of the compression spring. The elastic force exerted by the compression spring on the piston is directed towards the injection end, and the housing triggers There is a trigger connected to the end, the activation surface is provided with a button that can be pressed, the tail of the trigger is attached to the tail of the button, the head of the trigger is provided with a hook that is engaged with the lock, and the piston is in the non- When in the activated position, the hook is engaged with the lock, and the compression spring is in a compressed state. When the piston is in the activated position, when the hook is disengaged from the lock, the piston moves toward the injection end. move, the button drives the trigger to rotate, thereby prompting the hook to disengage from the lock. 2 . The needle-free injector according to claim 1 , wherein the lock includes a ring-shaped engagement that extends radially outward from the injection axis and faces toward the injection end of the housing. 3 . The trigger head includes an engaging surface extending radially inwardly from the spray axis and facing toward the trigger end of the housing; when the trigger is in the inactive position, the engaging surface and the engaging surface engage , when the trigger is in the activated position, the engaging surface and the engaging surface are disengaged from each other. 3. The needle-free injector according to claim 1, wherein the engaging surface is an annular inclined surface; the engaging surface is an inclined surface. 4. A needle-free injector according to claim 1, wherein a return spring is provided inside the trigger end of the housing, and the return spring presses on the tail of the trigger and forces the tail of the trigger to rotate toward the button . 5. The needle-free injector according to claim 4, wherein the return spring is a leaf spring biased at the tail of the trigger. 6. The needle-free injector of claim 1, further comprising a movable safety cover for preventing the button from being pressed. 7. The needle-free injector according to claim 6, wherein the safety cap is rotatably connected to the activation surface. 8 . The needle-free injector according to claim 1 , wherein the inner surface of the housing is provided with a blocking block facing the injection axis and blocking the extension of the compression spring. 9. The needle-free injector according to claim 1, wherein the adapter is mechanically connected to the housing in a detachable manner. 10 . The needle-free injector according to claim 1 , wherein the housing is configured with pistons of different sizes and compression springs. 11 .