CN114642793A - Prefilled syringe with leading guard shield - Google Patents

Abstract

The invention belongs to the technical field of syringes, and particularly relates to a prefilled syringe with a front shield. The invention achieves the technical effect of covering the needle head and not covering the surface of the needle cylinder through the needle, the syringe cylinder, the needle sleeve, the needle base unit and the protective cover unit. The invention has the following advantages: firstly, the movable range of the protective cover is near the needle of the injector, so that the sight of an operator for observing liquid medicine through the needle cylinder is not influenced, and the light inspection is not influenced; secondly, the axial position of the protective cover can be adjusted through push-pull action, the protective cover is used for exposing the needle head to complete injection, and the needle head is coated and discarded after the injection is finished, so that the phenomenon that others are injured by a needle is avoided; thirdly, when the protective cover is opened, the limiting ring can be clamped between the rib piece and the retraction end head to stably fix the position of the protective cover; fourthly, the demoulding groove is designed on the limiting ring, so that the limiting ring is separated from the grinding tool when the limiting ring is manufactured, and a larger expansion space is provided for the limiting ring, and the protruding edge piece can be conveniently crossed and the end socket can be clamped with the retraction end socket.

Description

A prefilled syringe with a front shield

technical field

The invention belongs to the technical field of syringes, and in particular relates to a prefilled syringe with a front shield.

Background technique

A syringe is a medical device used for injecting liquid medicines into the human body or for cleaning purposes. When used for human injection, it is often equipped with a needle. Because the syringe needs to be filled with medicine before injection, the traditional way of filling the medicine is to insert the needle tip into the medicine bottle to extract the medicine liquid, but this is time-consuming and laborious, and wastes medicine. Therefore, pre-filled syringes have appeared in the market. The sealing device fills the syringe with medicine in advance, so that when the syringe is actually used, the medicine is already inside, which saves time and effort in use.

However, the syringe needs to be discarded after use. The exposed needle has the risk of hurting people, and the residual blood and bacteria on the needle will cause infection during the wounding process. Therefore, how to ensure that the needle is not exposed during the disposal of the syringe becomes the syringe preparation process The problem that needs to be solved urgently. In the prior art, a protective cover is generally used to cover the needle when the syringe is discarded. A guard system and a syringe connected to the guard system are included, the guard system including a syringe carrier and a guard slidably connected to the carrier. The spring urges the shield from the retracted position to the extended position. A limit member is provided on the bracket and the shield for maintaining the shield in the retracted position. The syringe is slidably attached to the carrier and extends within the shield. Axial movement of the syringe relative to the carriage causes the detent member to disengage, allowing the spring to move the shield to the extended position. The catch is provided on the bracket to keep the shield in the extended position, reducing the risk of needle stick injuries.

However, the protective cover part of the invention uses a spring to move, and the spring surrounds the syringe, which affects the user's line of sight to observe the liquid in the syringe, thereby affecting the user's judgment on the state of the liquid in the syringe.

On the other hand, when the potting device performs the dosing process on the prefilled syringe, the syringe needs to be fixed. The design of the protective cover on the syringe affects the fixing process of the potting device to a certain extent. , resulting in unstable dosing process.

Therefore, in summary, there is an urgent need for a syringe shield device for covering the needle without covering the surface of the syringe.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a pre-filled syringe with a pre-shield. The present invention uses a needle, a syringe barrel, a needle cover, a needle seat unit, and a protective cover unit to cover the needle while not covering the syringe barrel. Surface technical effects.

The technical solution adopted by the present invention to solve the above problems is: a prefilled syringe with a front shield, including a needle, a syringe barrel, a needle cover, a needle seat unit, and a protective cover unit, wherein:

The needle, the syringe barrel, the needle cover, the needle seat unit, and the protective cover unit are coaxially arranged;

the protective cover unit includes a lower stop and an upper stop;

the lower stopper is close to the distal end side of the shield unit, and the upper stopper is close to the proximal end side of the shield unit;

The minimum inner diameter of the lower stop piece and the upper stop piece are both smaller than the maximum outer diameter of the syringe barrel, and the minimum inner diameter of the upper stop piece is also smaller than the maximum outer diameter of the needle seat unit;

When the protective cover unit is opened, the inner diameter of the upper stop piece can be expanded so that the minimum inner diameter thereof is larger than the maximum outer diameter of the syringe barrel.

A further preferred technical solution is that: the protective cover unit further includes a stop piece, wherein:

the lower stop piece is located in the middle of the lower stop piece and the upper stop piece;

The minimum inner diameter of the stop piece is smaller than the maximum outer diameter of the needle hub unit;

When the shield unit is opened, the inner diameter of the stop piece can be expanded so that the minimum inner diameter thereof is larger than the maximum outer diameter of the needle hub unit.

A further preferred technical solution is that: the protective cover unit includes a protective cover main body and a stop hook, wherein:

The distal end of the stop hook is connected to the proximal end of the shield body;

The proximal end of the stop hook is abutted with the proximal end side of the largest outer diameter of the needle seat unit.

A further preferred technical solution is that: the protective cover unit further includes a limit ring, wherein:

the limiting ring is arranged at the distal end of the shield body;

The proximal end of the limiting ring is abutted with the distal end of the maximum outer diameter of the syringe barrel.

A further preferred technical solution is that: the stop hook includes an elastic part and an engaging part; wherein:

The distal end of the elastic member is arranged on the proximal end of the shield body;

the engaging piece is arranged on the proximal end of the elastic piece;

The distal end of the engaging piece fits with the proximal end side of the largest outer diameter of the needle hub unit.

A further preferred technical solution is: the pre-filled syringe with a front shield further includes a retracting end, wherein:

the retraction tip is disposed at the distal end of the syringe barrel and is used to install the needle hub unit;

The distal end of the retracting end has an inclined surface, so that when the shield body is opened, the engaging piece passes over the retracting end.

A further preferred technical solution is: the stop hook also includes a proximal bevel, wherein;

The proximal inclined surface is disposed at the proximal end of the engaging piece, and when the shield body is opened, the engaging piece is made to pass over the retracting end.

A further preferred technical solution is that: the needle seat unit includes a needle mounting part and a convex rib part, wherein:

the needle is mounted on the proximal end of the needle mount;

the rib is mounted on the distal end of the needle mount;

The distal end of the protruding rib piece fits with the proximal end of the stop piece;

The proximal end of the protruding rib piece fits with the distal end of the engaging piece.

A further preferred technical solution is that: the maximum outer diameter of the protruding rib member is smaller than the maximum outer diameter of the retracting end.

A further preferred technical solution is that: the protective cover unit further includes a mold release groove, wherein:

The demoulding groove is arranged on the limiting ring;

The mold release groove provides a retracting space when the inner diameter of the limiting ring is enlarged.

A further preferred technical solution is that: the protective cover unit further includes a cantilever member, wherein:

The distal end of the cantilever is disposed on the proximal end of the shield body;

When the shield body is closed, the proximal end of the cantilever is abutted on the distal end of the rib.

A further preferred technical solution is: the needle seat unit further comprises a concave groove; wherein:

The recessed groove is provided on the needle mount.

A further preferred technical solution is that: the protective cover unit further includes a fingertip groove; wherein:

The fingertip groove is arranged at the distal end of the shield body;

The fingertip groove is used for pinching and exerting force with the finger pads when the protective cover body is opened.

A further preferred technical solution is that: the protective cover unit further includes a force-guiding protruding strip; wherein:

The force-guiding protruding strip is arranged on the inner bottom surface of the fingertip groove;

The force-guiding protruding strips are used to improve the frictional resistance when the fingers are pinched.

The present invention has the following advantages:

First, the movable range of the protective cover is near the needle of the syringe, which does not affect the operator's sight of the liquid medicine through the syringe, and does not affect the light inspection.

Second, the protective cover can adjust the axial position by pushing and pulling, which is used to expose the needle to complete the injection, and after the injection is completed, the needle is covered and discarded to prevent the needle from hurting others.

Thirdly, when the protective cover is opened, the limit ring is designed to be engaged between the convex rib and the retracted end to stably fix the position of the protective cover.

Fourth, a mold release groove is designed on the limit ring, which on the one hand facilitates the separation of the limit ring from the grinding tool when it is made, and on the other hand gives the limit ring a larger expansion space, which is convenient for passing over the rib pieces on the rib. Snap between the piece and the retracting end.

Description of drawings

FIG. 1 is an exploded view of the overall structure of the syringe in the present invention.

FIG. 2 is a schematic structural diagram of the protective cover unit in the present invention when it is opened.

FIG. 3 is a schematic structural diagram of the protective cover unit in the present invention when it is closed.

FIG. 4 is a cross-sectional view taken along line AA of FIG. 2 .

FIG. 5 is a schematic structural diagram of a protective cover unit in the present invention.

In the drawings, the components represented by each reference number are as follows: needle seat unit 1, protective cover unit 2, needle cover 3, retractable tip 4, syringe barrel 5, needle 6, needle mounting piece 101, convex rib piece 102, recess Slot 103, protective cover main body 201, stop hook 202, limit ring 203, demolding groove 204, cantilever piece 205, fingertip groove 206, force guiding protruding strip 207, elastic piece 202a, engaging piece 202b, End bevel 202c.

Detailed ways

definition:

1. Distal: refers to the end of the syringe towards the needle.

2. Proximal: refers to the end of the syringe away from the needle.

3. Axis: refers to a component with a symmetrical cross-section, along the line connecting the centroids of all its cross-sections.

4. Open: refers to the ability to expose the needle or needle cover during operation.

5. Closing: refers to the ability to cover the needle or needle cover during operation.

6. Socketing: refers to the act of installing the first part on the outer surface of the second part when the inner diameter of the first part is larger than the outer diameter of the second part.

7. Setting: refers to the method used to combine two parts together by bonding, snapping, welding, screwing, placing, etc.

8. Jacking up: means that the first part exerts a force on the second part, so that the second part moves toward the opposite direction of the position of the first part.

The following descriptions are only preferred embodiments of the present invention, and do not limit the scope of the present invention.

Example: As shown in Figures 1-5, a prefilled syringe with a front shield includes a needle 6, a syringe barrel 5, a needle cover 3, a needle seat unit 1, and a shield unit 2, where:

The needle 6, the syringe barrel 5, the needle cover 3, the needle base unit 1, and the protective cover unit 2 are coaxially arranged;

The protective cover unit 2 includes a lower stop and an upper stop;

The lower stopper is close to the distal end of the shield unit 2, and the upper stopper is close to the proximal end of the shield unit 2;

The minimum inner diameter of the lower stopper and the upper stopper are both smaller than the maximum outer diameter of the syringe barrel 5, and the minimum inner diameter of the upper stopper is also smaller than the maximum outer diameter of the needle seat unit 1;

When the protective cover unit 2 is opened, the inner diameter of the upper stop piece can be expanded, so that the minimum inner diameter thereof is greater than the maximum outer diameter of the syringe barrel 5 .

In this embodiment, the "pre-positioned" refers to that the protective cover unit 2 is located at the distal end of the entire syringe without covering the syringe barrel 5 at the proximal end of the entire syringe. The needle 6 and the syringe barrel 5 constitute the main part of the syringe, the needle seat unit 1 is arranged at the distal end of the syringe barrel 5, and the needle 6 is sleeved through the hole opened along the axis thereof, so that the syringe barrel 5 is inserted into the syringe barrel 5. The liquid medicine can flow out from the needle 6 through the hole in the needle seat unit 1 . After the syringe barrel 5 of the prefilled syringe is filled with medicinal liquid, the entire assembly of the syringe can be completed by installing a push rod at the opening of the proximal end, and the needle cover 3 is sleeved on the needle seat unit 1, and is used In order to encapsulate the needle 6, the entry of bacteria is prevented and the risk of leakage of the medicinal solution is avoided.

In addition, when the needle cover 3 is covered on the needle 6 , the protective cover unit 2 is installed on the needle seat unit 1 , and the upper stopper is engaged with the needle seat unit 1 at this time. In the engaging groove formed between the maximum outer diameter of the syringe barrel 5 and the distal end of the syringe barrel 5, the protective cover unit 2 can be pushed hard, so that the upper stop piece can be subjected to radial force, thereby radially expanding to Its minimum inner diameter is larger than the maximum outer diameter of the syringe barrel 5 , so that the protective cover unit 2 can move axially to the outer ring surface of the syringe barrel 5 .

In addition, when the protective cover unit 2 is axially moved toward the proximal end to the closed state, the lower stopper is engaged with the largest outer diameter of the needle hub unit 1, and the protective cover unit 2 stops at this time. Move to avoid blocking the syringe barrel 5, so that the movement range of the shield unit 2 is limited to the vicinity of the needle 6, and the inspector's sight is not affected during the light inspection process.

In addition, when the pharmaceutical factory gets the product before filling, the protective cover unit 2 is in the position of covering the needle base unit 1, and the syringe barrel 5 is not covered, which has the advantage of not affecting the filling. The light inspection process after filling, and when the nurse receives the filled product, does not affect the nurse's visual inspection of the drug and check the scale.

The steps to use the prefilled syringe are as follows:

S1. Push the shield unit 2 toward the axial proximal direction, so that the lower stop piece fits with the maximum outer diameter of the needle hub unit 1;

S2. Pull out the needle cover 3 along the axial direction, and complete the injection process;

S3. Push the protective cover unit 2 in the axial distal direction, so that the upper stop piece is in contact with the maximum outer diameter of the needle hub unit 1. At this time, the protective cover unit 2 Needle 6 achieves full encapsulation.

The protective cover unit 2 also includes a stop piece, wherein:

the lower stop piece is located in the middle of the lower stop piece and the upper stop piece;

The minimum inner diameter of the stop piece is smaller than the maximum outer diameter of the needle seat unit 1;

When the protective cover unit 2 is opened, the inner diameter of the stop piece can be expanded, so that the minimum inner diameter thereof is larger than the maximum outer diameter of the needle hub unit 1 .

In this embodiment, when the protective cover unit 2 has just started to be pushed in S1, and when the protective cover unit 2 has been pushed in S3, the stop part and the upper stop part are respectively abutted The distal end and the proximal end at the maximum outer diameter of the needle hub unit 1 form a clamping effect on the needle hub unit 1 , thereby realizing the fixing effect of the protective cover unit 2 .

In addition, in S1, in order to push the shield unit 2, an external force needs to be applied to the stop piece to expand radially, so that it can go beyond the maximum outer diameter of the needle hub unit 1, by It can be seen that in the S3, after the stop piece passes over the maximum outer diameter of the needle hub unit 1, in the case of no external force, the shield unit 2 will remain in the closed position, so that The needle 6 is covered to avoid exposure and injury.

The protective cover unit 2 includes a protective cover main body 201 and a stop hook 202, wherein:

The distal end of the stop hook 202 is connected to the proximal end of the shield main body 201;

The proximal end of the stop hook 202 fits with the proximal end of the needle hub unit 1 at the maximum outer diameter.

In this embodiment, the protective cover main body 201 is the main part covering the needle 6 , and the covering state can be switched among the needle 6 , the needle seat unit 1 and the syringe barrel 5 in the axial direction.

The stop hook 202 is a manifestation of the upper stop piece, and the proximal end of the stop hook 202 has a radially downwardly extending engaging piece for connecting with the maximum outer diameter of the needle seat unit 1 . The stop hook 202 further includes an elastic piece connected to the proximal end of the protective cover body 201, and the proximal end of the stop hook 202 is connected to the elastic piece of the proximal end of the protective cover body 201, and the protective cover is pushed in step S1. When the main body 201 is used, the elastic member is radially expanded by the jacking force from the outer ring surface of the syringe barrel 5 , thereby driving the engaging member to radially expand and fit on the surface of the syringe barrel 5 .

In addition, in S3, when pushing back the shield body 201, it is only necessary to push the engaging piece with one finger while holding the syringe barrel 5, so as to push the shield body 201 Move axially and complete the covering of the needle 6. When the stop piece passes over the maximum outer diameter of the needle seat unit 1, a "click" will be heard to indicate that the engagement is successful, and the needle 6 After the coating is completed, it can be discarded without visual confirmation, saving time and effort.

The protective cover unit 2 further includes a limit ring 203, wherein:

The limiting ring 203 is disposed at the distal end of the shield body 201;

The proximal end of the limiting ring 203 is abutted with the distal end of the syringe barrel 5 at the maximum outer diameter.

In this embodiment, the limit ring 203 is a form of the lower stop piece, which is integrally formed with the protective cover body 201 , does not slap your hands during the pushing process, and fits in a ring-shaped manner. When it is placed on the distal side of the maximum outer diameter of the syringe barrel 5, it will be more firm, and will not cross the distal side of the maximum outer diameter of the syringe barrel 5 due to deformation, causing the protective cover body 201 to continue along the Axial is moved proximally so as to obscure the syringe barrel 5 .

The stop hook 202 includes an elastic member 202a, and an engaging member 202b; wherein:

The distal end of the elastic member 202a is disposed on the proximal end of the shield main body 201;

the engaging member 202b is disposed on the proximal end of the elastic member 202a;

The distal end of the engaging member 202b fits with the proximal end of the needle hub unit 1 at the maximum outer diameter.

In S1 of this embodiment, when the stop hook 202 is subjected to a radial force, the elastic member 202a will expand radially outward, thereby driving the engaging member 202b to release the needle hub unit 1 The fitting state of the proximal side at the maximum outer diameter of the elastic member 202a has a tendency to retract radially inward after expanding outward, so that the engaging member 202b is in close contact with the syringe barrel 5 A certain frictional force is generated on the outer ring surface of the outer ring, and this frictional force will make the position of the protective cover body 201 fixed relative to the syringe barrel 5 without the axial pushing force, so as to facilitate the operator in the Needle 6 is used for injection in S2.

The front shield for a prefilled syringe further includes a retracting end 4, wherein:

The retracting end 4 is arranged at the distal end of the syringe barrel 5 and is used to install the needle seat unit 1;

The distal end of the retractable end head 4 has an inclined surface, and when the protective cover body 201 is opened, the engaging piece 202b is made to pass over the retraction end head 4 .

In S1 of this embodiment, when the shield body 201 is pushed axially, the radial force on the stop hook 202 comes from the radial force generated by the inclined surface pushing up the proximal end of the engaging piece 202b. The outward component force causes the elastic member 202a to expand radially outward.

In addition, the inclined surface forms a groove with the proximal side of the maximum outer diameter of the needle hub unit 1, and the groove can be used in the initial position of the shield body 201 in the S1 and the shield body 201 in the S3. At the final position, the engaging member 202b is engaged, and at the same time, the distal end face at the maximum outer diameter of the needle hub unit 1 is pushed up with the stopping member, so that the protective cover body 201 is covering the needle. 6 positions are fixed.

The stop hook 202 further includes a proximal inclined surface 202c, wherein;

The proximal inclined surface 202c is disposed at the proximal end of the engaging member 202b, and when the protective cover main body 201 is opened, the engaging member 202b is allowed to pass over the retracting end head 4 .

In this embodiment, the slope of the proximal slope 202c is the same as the slope of the slope. In the S1, when the shield body 201 is pushed axially, the proximal slope 202c is in contact with the slope. Together, when the inclined surface is fixed, the proximal inclined surface 202c can easily go over the inclined surface, avoiding the situation that the engaging piece 202b is stuck in the groove.

The needle hub unit 1 includes a needle mounting member 101 and a rib member 102, wherein:

the needle 6 is mounted on the proximal end of the needle mount 101;

the rib member 102 is mounted on the distal end of the needle mounting member 101;

The distal end of the protruding rib member 102 is engaged with the proximal end of the stop member;

The proximal end of the protruding rib member 102 is abutted with the distal end of the engaging member 202b.

In this embodiment, the needle mounting member 101 contains the hole, the hole communicates with the syringe barrel 5, and the needle 6 is installed in the hole, so in S3, the syringe barrel 5 The pre-filled medicinal liquid in can flow out from the needle 6 along the orifice to complete the injection.

In addition, the raised rib member 102 is a form of expression at the maximum outer diameter of the needle hub unit 1 , and the proximal end face of the raised rib member 102 and the distal end face of the retracting tip 4 form a The groove, the rib 102 is an annular structure, so that at the initial position of the shield body 201 in S1 and the final position of the shield body 201 in S3, no matter how the shield body 201 rotates, the The distal end face of the engaging member 202b is always in contact with the proximal end face of the protruding rib member 102

The maximum outer diameter of the protruding rib 102 is smaller than the maximum outer diameter of the retracting end 4 . in:

When the protective cover main body 201 is opened, the inner diameter of the limiting ring 203 can be enlarged so as to pass over the protruding rib 102 and fit on the distal end of the retracting end 4 .

In this embodiment, the limit ring 203 has a certain range of elasticity, but the elasticity is not enough to make the minimum inner diameter of the limit ring 203 expand to be larger than the maximum outer diameter of the retracting end 4, that is, the The limit ring 203 cannot enter the outer ring surface of the shield main body 201 beyond the retraction end 4, so in the S1 process, according to the maximum inner diameter of the limit ring 203, its design scheme There are three kinds:

In the first design solution, the minimum inner diameter of the limiting ring 203 is smaller than the maximum outer diameter of the rib member 102 , and the elasticity of the limiting ring 203 is not enough to make the minimum inner diameter of the limiting ring 203 expand to larger than The maximum outer diameter of the rib member 102 is such that when the shield body 201 moves to the final position during the S1 process, the proximal end face of the limiting ring 203 is abutted with the distal end face of the rib member 102 .

In the second design scheme, the minimum inner diameter of the limiting ring 203 is smaller than the maximum outer diameter of the rib member 102, but the elasticity of the limiting ring 203 can make the minimum inner diameter of the limiting ring 203 expand to be larger than the minimum inner diameter of the limiting ring 203. The maximum outer diameter of the rib member 102 is determined, so that when the shield body 201 moves to the final position during the S1 process, the limiting ring 203 will pass over the rib member 102 and be engaged with the rib member 102 . 102 in the groove between the retraction end 4 .

In the third design solution, the minimum inner diameter of the limiting ring 203 is greater than the maximum outer diameter of the rib member 102, so that when the shield body 201 moves to the final position during the S1 process, the limiting ring 203 The proximal end face is fitted with the distal end face of the retracting tip 4 .

In the second design solution, the fixing effect is better when the shield body 201 moves to the final position during the S1 process, which is a preferred design solution for the limiting ring 203 .

The shield unit 2 also includes a mold release groove 204, wherein:

The demolding groove 204 is arranged on the limiting ring 203;

The mold release groove 204 provides a retracting space for the limiting ring 203 when the inner diameter is enlarged.

In this embodiment, the limiting ring 203 needs to be prepared by a mold during the product manufacturing process, and the limiting ring 203 has a protruding structure inside the ring for pushing up the rib member 102, which is Inverted shape, but the mold can not really make it, in order to form the raised structure, only the method of forced demoulding can be adopted, which brings the risk that the product shell of the limit ring 203 may be broken. After the mold release groove 204 is set on the limit ring 203, it will give the limit ring 203 a retreat space when it is demolded, increase the toughness of the shell structure, and reduce the risk of breaking the product during the strong release process. risk.

In addition, under the second design solution of the limit ring 203 , the mold release groove 204 gives the limit ring 203 a larger retreat space, that is to say, the limit ring 203 is increased in size. The elasticity makes it easier to pass over the convex rib 102 to be engaged in the groove.

The protective cover unit 2 also includes a cantilever member 205, wherein:

The distal end of the cantilever member 205 is disposed on the proximal end of the shield body 201;

When the shield body 201 is closed, the proximal end of the cantilever member 205 is engaged with the distal end of the protruding rib member 102 .

In this embodiment, the cantilever member 205 is a manifestation of the stop member, and its distal end face is a vertical plane, which can push up the proximal end face of the protruding rib member 102, so that the end face of the cantilever member 102 is lifted up. In the state, the shield main body 201 will not move toward the proximal direction in the axial direction.

The needle hub unit 1 further includes a concave groove 103; wherein:

The recessed groove 103 is provided on the needle mount 101 .

In this embodiment, the concave groove 103 is axially provided on the needle mounting member 101, so that the needle mounting member 101 forms a cross-shaped structure, which can be used when the mold temperature is too high or too low. Avoid the problem of shrinkage in injection molding, and can achieve material reduction and reduce the overall weight of the syringe.

The shield unit 2 also includes a fingertip groove 206; wherein:

The fingertip groove 206 is disposed at the distal end of the shield body 201;

The fingertip grooves 206 are used for pinching and exerting force with the finger pads when the protective cover main body 201 is opened.

In this embodiment, under the second design solution of the limiting ring 203 , in order for the limiting ring 203 to pass over the rib member 102 , a larger axial direction needs to be applied to the shield main body 201 . However, the surface of the protective cover main body 201 is relatively smooth, and it is not easy to exert force, and once the fingers slide, there is a risk of being stuck on the needle 6, so the fingertip groove 206 is provided to use The user's fingers can abut on the inner surface of the fingertip groove 206, which is convenient for exerting force.

The protective cover unit 2 further includes a force-guiding protruding bar 207; wherein:

The force guiding protruding strip 207 is arranged on the inner bottom surface of the fingertip groove 206;

The force-guiding protruding strips 207 are used to improve the frictional resistance when the fingers are pinched.

In this embodiment, the inner bottom surface of the fingertip groove 206 is still a smooth surface. In order to improve its frictional resistance, a plurality of the force-guiding protruding strips 207 are arranged on the inner bottom surface of the fingertip groove 206 . Generally, there are three, and the user's fingers can be more firmly attached to the inner bottom surface of the fingertip groove 206 during the process of pinching, and the phenomenon of dislocation will not occur.

An assembly of a prefilled syringe with a front shield includes an injection piston, and an injection push rod mounted on the injection piston by plug-in action.

In this embodiment, the injection piston is used to push out the liquid medicine in the syringe barrel 5 to complete the injection process, and the injection push rod is a device that pushes the injection piston.

A method for assembling an assembly of a prefilled syringe with a front shield, comprising the following steps:

a. The needle cover 3 is first installed in the protective cover unit 2 , and the distal end of the needle cover 3 is pushed up against the stop hook 202 .

b. Install the protective cover unit 2 on the needle mount 101 , while the needle cover 3 is sleeved on the needle 6 .

In this embodiment, when the needle cover 3 pushes up the stop hook 202, it is installed to a predetermined position. When the protective cover unit 2 is installed on the needle mounting member 101, an additional catch is used. The holding device aligns the needle cover 3 with the needle 6 and pushes the needle cover 3 to be installed on the needle 6 to complete the sealing.

A medicine filling method for an assembly of a prefilled syringe with a front shield, comprising the following steps:

a. The syringe barrel 5 is placed vertically, and the liquid medicine is poured into the syringe barrel 5, so that the liquid level is perpendicular to the inner side of the syringe barrel 5;

b. Use the sleeve to put the injection piston into the syringe barrel 5, and no air is left between the injection piston and the liquid surface of the medicine;

c. Insert the injection plunger into the syringe barrel 5 and install it on the injection piston.

In this embodiment, when the medicine is poured, the liquid level of the liquid medicine is perpendicular to the inner side of the syringe barrel 5, so that when the injection piston is installed in the next step, there is no gap between the liquid level of the medicine and the liquid level of the medicine. There is air.

In addition, the injection piston is installed in the sleeve in a compressed state, which means that a gap is left between the sleeve and the syringe barrel 5 for expelling gas, and the injection piston is installed in the syringe barrel After 5, the diameter expands and abuts on the inner surface of the syringe barrel 5 to achieve the effect of "drug filling".

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the technical field, it can also be done without departing from the purpose of the present invention. various modifications. These are all non-creative modifications, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims (14)

1. A prefilled syringe with a front shield, comprising a needle (6), a syringe barrel (5), and a needle cover (3), characterized in that it further comprises a needle seat unit (1), and a protective hood unit (2), wherein: The needle (6), the syringe barrel (5), the needle cover (3), the needle seat unit (1), and the protective cover unit (2) are coaxially arranged; The protective cover unit (2) includes a lower stop piece and an upper stop piece; The lower stop piece is close to the distal end side of the shield unit (2), and the upper stop piece is close to the proximal end side of the shield cover unit (2); The minimum inner diameter of the lower stopper and the upper stopper are both smaller than the maximum outer diameter of the syringe barrel (5), and the minimum inner diameter of the upper stopper is also smaller than the maximum outer diameter of the needle seat unit (1). outer diameter; When the protective cover unit (2) is opened, the inner diameter of the upper stop piece can be expanded, so that the minimum inner diameter thereof is larger than the maximum outer diameter of the syringe barrel (5). 2 . A prefilled syringe with a front shield according to claim 1 , wherein the shield unit ( 2 ) further comprises a stop piece, wherein: 2 . the lower stop piece is located in the middle of the lower stop piece and the upper stop piece; The minimum inner diameter of the stop piece is smaller than the maximum outer diameter of the needle seat unit (1); When the protective cover unit (2) is opened, the inner diameter of the stop piece can be expanded, so that the minimum inner diameter thereof is larger than the maximum outer diameter of the needle hub unit (1). 3. A prefilled syringe with a front shield according to claim 2, wherein the shield unit (2) comprises a shield body (201) and a stop hook (202) ,in: The distal end of the stop hook (202) is connected to the proximal end of the shield body (201); The proximal end of the stop hook (202) is abutted with the proximal end of the needle seat unit (1) at the maximum outer diameter. 4. A prefilled syringe with a front shield according to claim 3, wherein the shield unit (2) further comprises a limit ring (203), wherein: The limiting ring (203) is arranged at the distal end of the shield body (201); The proximal end of the limiting ring (203) fits with the distal end of the syringe barrel (5) at the maximum outer diameter. The pre-filled syringe with a front shield according to claim 3, wherein the stop hook (202) comprises an elastic part (202a) and an engaging part (202b); in: The distal end of the elastic member (202a) is disposed on the proximal end of the shield body (201); The engaging member (202b) is disposed on the proximal end of the elastic member (202a); The distal end of the engaging piece (202b) is abutted with the proximal end side of the largest outer diameter of the needle hub unit (1). 6. A prefilled syringe with a front shield according to claim 5, characterized in that it further comprises a retracting end (4), wherein: The retracting tip (4) is arranged at the distal end of the syringe barrel (5), and is used to install the needle seat unit (1); The distal end of the retracting end head (4) has an inclined surface, and when the protective cover main body (201) is opened, the engaging piece (202b) is made to pass over the retracting end head (4). 7. The prefilled syringe with a front shield according to claim 6, wherein the stop hook (202) further comprises a proximal bevel (202c), wherein; The proximal inclined surface (202c) is disposed at the proximal end of the engaging piece (202b), and when the protective cover main body (201) is opened, the engaging piece (202b) is made to pass over the retracting end head (202b). 4). 8. A prefilled syringe with a front shield according to claim 6, wherein the needle seat unit (1) comprises a needle mounting part (101) and a convex rib part (102) ,in: the needle (6) is mounted on the proximal end of the needle mount (101); the rib (102) is mounted on the distal end of the needle mount (101); The distal end of the protruding rib member (102) is abutted with the proximal end of the stop member; The proximal end of the protruding rib member (102) fits with the distal end of the engaging member (202b). 9 . The pre-filled syringe with a front shield according to claim 8 , wherein the maximum outer diameter of the raised rib ( 102 ) is smaller than the maximum outer diameter of the retracted end ( 4 ). 10 . path. 10. A pre-filled syringe with a front shield according to claim 4, wherein the shield unit (2) further comprises a demoulding groove (204), wherein: The demolding groove (204) is arranged on the limiting ring (203); The mold release groove (204) provides a retracting space for the limiting ring (203) when the inner diameter is enlarged. 11. A prefilled syringe with a front shield according to claim 8, wherein the shield unit (2) further comprises a cantilever (205), wherein: The distal end of the cantilever (205) is disposed on the proximal end of the shield body (201); When the shield main body (201) is closed, the proximal end of the cantilever member (205) is abutted on the distal end of the protruding rib member (102). 12. A prefilled syringe with a front shield according to claim 8, wherein the needle seat unit (1) further comprises a concave groove (103); wherein: The recessed groove (103) is provided on the needle mount (101). 13. A prefilled syringe with a front shield according to claim 3, wherein the shield unit (2) further comprises a fingertip groove (206); wherein: The fingertip groove (206) is arranged at the distal end of the shield body (201); The fingertip groove (206) is used for pinching and exerting force with the finger pads when the protective cover main body (201) is opened. 14. A prefilled syringe with a front shield according to claim 13, characterized in that, the shield unit (2) further comprises a force-guiding protruding strip (207); wherein: The force-guiding protruding strip (207) is arranged on the inner bottom surface of the fingertip groove (206); The force-guiding protruding strips (207) are used to improve the frictional resistance when the fingers are pinched.

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