CN114796727A

CN114796727A - Stop ring, prefilled syringe and assembly thereof, shield and mounting method and assembly thereof

Info

Publication number: CN114796727A
Application number: CN202210492987.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shanghai Xinyaopaike Medical Technology Co ltd
Current assignee: Shanghai Xinyaopaike Medical Technology Co ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-07-29
Anticipated expiration: 2042-05-07
Also published as: CN114796727B; WO2023217043A1

Abstract

The invention belongs to the technical field of medical consumables, and particularly relates to a stop ring, a pre-filled and sealed injector and a component thereof, a protective cover and an installation method and a component thereof. The invention has the technical effects that the mounting ring and the elastic hook which is arranged on the mounting ring and used for clamping the shielding part of the injector are matched with the needle cylinder and used for clamping the protective cover on the needle tube. The invention has the following advantages: firstly, an annular stop ring structure is directly sleeved on an installation part of the injector, and a clamping structure for limiting a shade part is added to the injector; secondly, the elastic hook is hooked with the side edge of the sliding opening, so that the protective cover is not easy to be separated from a clamping state; thirdly, the elastic plate is arranged and clamped with the elastic hook, so that the protective cover can be fixed to be in an open state, and a nurse can conveniently inject; fourthly, after the nurse finishes the injection, the elastic plate is pinched by the two fingers to enable the stop surface and the elastic hook to be disengaged, so that the protective cover is ejected to the needle head to be closed.

Description

Stop ring, prefilled syringe and assembly thereof, shield and mounting method and assembly thereof

Technical Field

The invention belongs to the technical field of medical consumables, and particularly relates to a stop ring, a pre-filled and sealed injector and a component thereof, a protective cover and an installation method and a component thereof.

Background

The medical consumable is a consumable device used for diagnosis, treatment, health care, rehabilitation and the like, a needle cylinder for an injector belongs to basic nursing consumable materials in the medical consumable materials, and generally comprises the needle cylinder, an injection needle and a needle sleeve, and the injectors are various, wherein the prefilled injector is a medical consumable material which is filled with specified medicines in advance and is directly injected into the hands of medical staff, is widely used for vaccination, and has very wide market application prospect.

However, after the prefilled syringes are used in large quantities, a large number of syringes with injection needles need to be discarded, and the exposed needles are very dangerous in the garbage transferring process, so that cleaning personnel can be stabbed, and the risk of spreading epidemic situations exists.

Thus, in order to address such problems, a range of pre-filled syringes with needle shields are emerging on the market, for example chinese patent publication No. CN111372634A, publication No. 2020-07-03, which discloses an apparatus for removing and retaining a needle shield, the arm being attached to the needle shield when the cap is pushed onto a medicament delivery device and retaining the needle shield inside the cap when the cap is removed from the device. The apparatus provides an improved injection device which does not require the separate removal of the needle shield from the needle.

However, the protective cover attached to the needle tube is sleeved or clamped, so that the risk of falling off from the needle tube exists, a stop piece is needed to fix the protective cover, a clamping piece is preset on the needle tube to fix the protective cover in general actual production, and the whole needle tube production line needs to be upgraded, so that the cost is too high.

In summary, therefore, there is a need for a stop device for engaging a protective cover on a syringe that is configured to be installed with a syringe barrel of an existing prefilled syringe.

Disclosure of Invention

The invention aims to provide a stop ring, a pre-filled and sealed injector and a component thereof, a protective cover and an installation method and a component thereof.

The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a stop ring for connecting injection cylinder and needle protective sheath thereof, includes the collar for cup joint injection cylinder or its extension part, and set up on the collar, and the elasticity that is used for block needle protective sheath colludes, elasticity colludes and includes radial board and axial slab, radial board sets up on the collar, the axial slab sets up on the radial board.

The further preferred technical scheme is as follows: the mounting ring is provided with a stop piece for clamping a clamping piece on the mounting part of the injector.

The further preferred technical scheme is as follows: the stopper communicates with the hollow portion in the mounting ring.

A pre-filled and sealed injector comprising the stop ring comprises an injection needle cylinder, a needle mounting piece, an injection needle and a needle protection sleeve; wherein:

the needle mounting piece is arranged at the far end of the injection needle cylinder, the needle mounting piece is provided with a through hole and is communicated with the interior of the injection needle cylinder, the injection needle is mounted on the needle mounting piece in a mode of being inserted into the through hole, the needle protective sleeve is sleeved on the needle mounting piece and completely covers the injection needle, and the injection needle cylinder, the needle mounting piece, the injection needle and the needle protective sleeve have a common axis;

the mounting ring is mounted on the needle mounting piece in a sleeved mode, and after mounting, the direction of the hook of the elastic hook faces towards the near end.

The further preferred technical scheme is as follows: a stop block is arranged on the needle mounting piece; the stop block is embedded in the stop member when the mounting collar is fitted over the needle mount.

The further preferred technical scheme is as follows: the needle mounting piece is further provided with a bevel block for clamping the distal end side of the mounting ring.

The further preferred technical scheme is as follows: the far end of the inclined plane block is provided with an inclined plane for installation.

The utility model provides an include protection casing of embedment syringe in advance, includes the protection casing that sets up the slip mouth on it to shelter from the syringe needle, simultaneously elasticity colludes and stretches into the slip mouth is in order to fix the protection casing.

The further preferred technical scheme is as follows: still be equipped with the elastic plate on the shield, the elastic plate cantilever sets up on the inboard face of sliding port, the near-end has along the radial adduction trend of shield.

The further preferred technical scheme is as follows: the near end of the elastic plate is provided with a near end stop surface for jacking the elastic hook when the protective cover is closed, so that the protective cover is locked.

The further preferred technical scheme is as follows: the inner side of the elastic plate is provided with a far-end stop surface used for jacking the elastic hook when the protective cover is opened, so that the protective cover is locked.

The further preferred technical scheme is as follows: the free end of the axial plate is radially and outwardly expanded along the mounting ring, and when the far-end stop surface is jacked up, the elastic plate is radially and inwardly pressed or outwardly pulled along the protective cover, so that the stop surface for opening of the axial plate and the elastic hook are separated from a jacking state.

The further preferred technical scheme is as follows: the protective cover further comprises a guide inclined plane arranged at the near end of the protective cover and used for guiding the elastic hook into the sliding opening in a sliding mode.

A method of installing a boot on a pre-filled syringe, comprising the steps of:

s1, sleeving the mounting ring on the needle mounting piece;

s2, continuously pushing the mounting ring to cross the inclined plane block and clamp the inclined plane block and the distal end face of the injection syringe, and simultaneously embedding the stop block on the needle mounting piece into the stop piece on the mounting ring;

s3, axially installing the needle protection sleeve into the protection cover, and axially sleeving the protection cover with the needle protection sleeve on the needle installation piece;

and S4, continuously pushing the protective cover to enable the proximal end of the protective cover to expand and cross the elastic hook, and finally enabling the elastic hook to be embedded into the sliding opening and hook the protective cover.

An assembly of a pre-filled syringe comprising a push rod and a piston; wherein: the push rod is arranged on the piston; the piston is arranged in the injection syringe and is used for pushing the liquid medicine out through the injection needle when the push rod is pushed towards the far end direction.

An assembly of a shield pre-filled syringe comprising a push rod and a piston; wherein: the push rod is arranged on the piston; the piston is arranged in the injection syringe and is used for pushing the liquid medicine out through the injection needle when the push rod is pushed towards the far end direction.

The invention has the following advantages:

firstly, an annular stop ring structure is directly sleeved on an installation part of the injector, a clamping structure for limiting a shade part is added to the injector, the installation is convenient, and the industrial production is facilitated;

secondly, the elastic hook is hooked with the side edge of the sliding opening and used for fixing the protective cover, the fixing effect is good, and the protective cover is not easy to be separated from a clamping state;

thirdly, the elastic plate is arranged, the stop surface is arranged on the elastic plate and is clamped with the elastic hook, so that the protective cover can be fixed to be in an open state, and the injection is convenient for nurses to carry out injection;

fourthly, after the nurse finishes injecting, pinch the elastic plate with two fingers and can make the stop face and elasticity collude and remove the block to the protection casing launches to the syringe needle and realizes closing, and the mode of pinching closed also can realize one-hand operation to the nurse that the finger is short little.

Drawings

FIG. 1 is an exploded view of the barrel, stop ring, shield, and needle shield of the present invention.

Fig. 2 is a structural schematic diagram of the needle protective sleeve covering the injection needle, and the protective cover and the elastic hook are arranged on the injection needle cylinder.

Fig. 3 is a structural schematic view of the needle protective sleeve covering the injection needle and the injection needle cylinder is provided with an elastic hook.

Fig. 4 is a schematic structural view of the syringe of the present invention with an elastic hook mounted thereon.

Fig. 5 is a schematic structural view of the syringe cylinder according to the present invention.

Fig. 6 is a schematic structural view of the syringe of the present invention with a shield and an elastic hook.

Fig. 7 is a schematic cross-sectional view taken along line a-a of fig. 6.

Fig. 8 is an enlarged schematic view of fig. 7.

Fig. 9 is an enlarged schematic view of fig. 8.

FIG. 10 is a schematic view of the stop and ramp block position on the needle mount of the present invention.

Fig. 11 is a schematic structural view of the shield according to the present invention.

Fig. 12 is a schematic view of the shield of the present invention in another orientation relative to fig. 11.

FIG. 13 is a schematic view of the elastic hook of the present invention.

Fig. 14 is a schematic structural view of the elastic hook of the present invention in another direction relative to fig. 13.

Fig. 15 is a schematic structural view of the elastic plate of the present invention.

In the drawings, the reference numerals denote the following components: the injection syringe 11, the needle mounting piece 12, the injection needle 13, the needle protecting sleeve 14, the protecting cover 101, the sliding opening 102, the elastic plate 103, the guide inclined plane 105, the mounting ring 201, the elastic hook 202, the proximal end stop surface 103a, the distal end stop surface 103b, the stopping piece 201a, the radial plate 202a, the axial plate 202b, the through hole 12a, the inclined plane block 12b, the mounting inclined plane 12c and the stopping piece 12 d.

Detailed Description

Definition of

1. A far end: refers to the end far away from the medicine injection opening of the injection syringe.

2. Proximal end: refers to the end towards the medicine injection opening of the injection syringe.

3. Axis: refers to an object having a circular cross-section through the vertical line of the center of the circle.

4. Opening: refers to the state in which the syringe needle or the syringe needle and the protective sheath are exposed.

5. Closing: the finger is covered with the syringe needle or the syringe needle and the protective sleeve.

6. Setting: refers to any means for arranging and bonding two components together by bonding, snapping, welding, screwing, placing, etc.

7. Jacking: the first finger component exerts a force on the second component, so that the second component moves or deforms towards the direction opposite to the position of the first component.

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1 to 15, a stop ring for connecting a syringe and a needle protection sleeve thereof comprises a mounting ring 201 for sleeving the syringe or an extension part thereof, and an elastic hook 202 arranged on the mounting ring 201 for engaging with the needle protection sleeve, wherein the elastic hook 202 comprises a radial plate 202a and an axial plate 202b, the radial plate 202a is arranged on the mounting ring 201, and the axial plate 202b is arranged on the radial plate 202 a.

In this embodiment, the inner diameter of the mounting ring 201 is generally larger than the outer diameter of the syringe mounting location, but it should be noted that this does not mean that the minimum ring inner diameter of the mounting ring 201 is larger than the maximum outer diameter of the syringe mounting location, and when the mounting ring 201 is mounted, the mounting ring 201 is deformed to pass the maximum outer diameter of the mounting location, so as to achieve the effect of snap-fit mounting.

The hook direction of the elastic hook 202 may be towards the proximal end, or towards the distal end, and is generally set to be towards the proximal end, so as to prevent the shield part arranged on the injector from being separated from the injector syringe part towards the distal end, and the "elasticity" feature of the elastic hook 202 is that when the elastic hook is installed, the hook is firstly contracted inwards, and then expanded outwards, so as to hook on the installation opening set in the shield part.

However, when the mounting ring 201 is directly fitted to the syringe mounting portion, the mounting ring tends to rotate, and the movement of the shield portion of the syringe only in the extending direction of the syringe is not completely restricted, and the mounting ring 201 is further provided with a stopper 201a for engaging with an engaging piece on the syringe mounting portion. When the mounting ring 201 is mounted, the mounting ring 201 can be easily clamped on the clamping piece on the mounting position of the injector so as to prevent the mounting ring 201 from rotating after being mounted.

The stopper 201a may be a groove or a protruding block, and the engaging member may also be a protruding block or a groove, and generally, when the stopper 201a is provided as a groove, the engaging member is provided as a protruding block and is fitted into the stopper 201a during installation; or when the stopper 201a is provided as a protruding piece, the engaging piece is provided as a groove, and is fitted into the stopper 201a during mounting.

Further, the stopper 201a may be provided on any one surface of the mounting ring 201, such as a proximal end surface, a distal end surface, an outer ring surface, etc.

In addition, the stopper 201a and the engaging members are preferably two protruding pieces, and the two engaging members are engaged with the distal and proximal ends of the stopper 201a, but this may cause a gap between the mounting ring 201 and the syringe mounting portion, which is not preferable for use.

The radial plate 202a and the axial plate 202b jointly form the elastic hook 202, wherein the axial plate 202b is a main part of the elastic hook 202 with elasticity, and the axial plate 202b and the mounting ring 201 are respectively mounted at two ends of the radial plate 202a so as to form a gap between the axial plate 202b and the mounting ring 201, thereby facilitating hooking the injector cap.

Generally, the engaging member on the syringe mounting portion is disposed to be in contact with the mounting portion without leaving a gap therebetween, that is, not to be suspended, so that when the mounting ring 201 is mounted, the stopper 201a has at least one opening to be directly communicated with the mounting portion of the syringe, and further, the stopper 201a is communicated with the hollow portion inside the mounting ring 201. Thus, when the mounting ring 201 is mounted, the stopper 201a directly communicates with the mounting portion of the syringe at the opening communicating with the hollow portion in the mounting ring 201.

A pre-filled syringe comprising a syringe barrel 11, a needle mount 12, a needle 13 and a needle shield 14; wherein:

the needle mounting member 12 is disposed at the distal end of the syringe 11, the needle mounting member 12 has a through hole 12a communicating with the inside of the syringe 11, the injection needle 13 is mounted on the needle mounting member 12 in such a manner as to be inserted into the through hole 12a, the needle protection cover 14 is fitted over the needle mounting member 12 and completely covers the injection needle 13, and the syringe 11, the needle mounting member 12, the injection needle 13, and the needle protection cover 14 have a common axis;

the mounting ring 201 is mounted on the needle mounting member 12 in a sleeved manner, and after mounting, the hook direction of the elastic hook 202 faces to the proximal end.

In this embodiment, the syringe 11, the needle mounting member 12, the injection needle 13 and the needle protecting cover 14 are all necessary components of the prior art syringe, so as to realize the functions of filling and injecting the medicine,

furthermore, it should be noted that the needle protection sheath 14 is standardized in shape and made of the existing pre-filled needle sheath material, rather than a non-standard profile cap, which is advantageous in that:

1. the use habit of the user is not changed;

2. the chemical compatibility of the rubber protective cap does not need to be evaluated again, and the project development period and the product registration period are greatly reduced;

3. enhancing the customer confidence.

A stop block 12d is arranged on the needle mounting member 12; when the mounting ring 201 is fitted to the needle mount 12, the stopper 12d is fitted into the stopper 201 a. The stopper 12d is the above-mentioned "engagement member on the syringe mounting portion".

In order to prevent the mounting ring 201 from falling off after being fitted to the needle mount 12, the needle mount 12 is further provided with a slope block 12b for engaging with the distal end side of the mounting ring 201. The bevel block 12b is the "maximum outer diameter of the mounting site for the syringe" mentioned above.

The distal end of the sloping block 12b has a mounting sloping surface 12 c.

During installation, the installation ring 201 expands and deforms along the installation inclined plane 12c so as to pass over the inclined plane block 12b, and the far end face of the installation ring 201 is attached to the near end face of the inclined plane block 12b, so that the limit effect on the installation ring 201 is realized.

A protective cover pre-potting injector comprises a protective cover 101 provided with a sliding opening 102 to shield an injection needle 13, and an elastic hook 202 extends into the sliding opening 102 to fix the protective cover 101.

The elastic hook 202 and the protective cover 101 are mounted in the following manner:

1. the elastic hook 202 is installed on the needle mounting member 12, and the hook is bent toward the proximal end of the syringe 11;

2. when the protective cover 101 of the protective cover 101 is sleeved on the needle mounting member 12, the protective cover is sleeved on the elastic hook 202 of the elastic hook 202 through deformation, and after the protective cover passes over the elastic hook 202, the sliding port 102 is sleeved on the elastic hook 202.

The elastic hook 202 slides into the sliding opening 102 in the sleeving process and hooks the side surface of the near end side of the sliding opening 102, so that the blocking effect of the protective cover 101 sliding towards the far end direction is realized.

After the installation is finished, the components are handed over to downstream manufacturers to fill the medicines, the medicines are filled from the medicine injection opening of the injection needle cylinder 11, and then a push rod and an injection piston are installed on the injection needle cylinder 11 through the medicine injection opening to complete the pre-encapsulation of the injector.

In addition, the light inspection can be performed on the injector when the injector leaves the factory, the light inspection refers to that whether the injector filling and plugging are qualified or not is checked through the manual observation mode of the needle cylinder, and most of integrated protective covers in the market influence the process, for example, the Chinese utility model with the bulletin number of CN214911888U and the bulletin date of 2021-11-30 discloses an injector needle head protective device and a safety injector thereof, which comprises a protective outer sleeve, a mounting inner sleeve and a spring, wherein the inner sleeve and the outer sleeve are sleeved to block the view field inside the needle cylinder, so that the light inspection process is influenced, and in the embodiment, the protective cover unit 2 only covers the needle mounting tube 12 under the condition that the needle cylinder is not used, and the partial far-end side end head of the needle cylinder 11 does not influence the light inspection process.

The use method of the shield pre-encapsulation syringe comprises the following steps:

1. axially moving the protective cover 101 along the proximal direction of the syringe 11 until the back side of the hook of the elastic hook 202 abuts against the distal side of the sliding port 102, thereby exposing the needle protecting sheath 14;

2. opening the needle protection 14 to expose the injection needle 13;

3. performing injection operation;

4. after the injection operation is completed, the protective cover 101 is axially moved along the distal direction of the injection needle cylinder 11 until one side of the hook of the elastic hook 202 hooks the proximal side surface of the sliding port 102, so as to completely cover the injection needle 13.

However, the protection cover 101 needs to achieve a fixing effect after being closed, and further, the protection cover 101 is further provided with an elastic plate 103, the elastic plate 103 is arranged on the inner side surface of the sliding port 102 in a cantilever manner, and the proximal end of the elastic plate has a tendency of being retracted along the radial direction of the protection cover 101.

The function and implementation of the elastic plate 103 are as follows:

1. when the protective cover 101 is opened, the elastic hook 202 jacks up the elastic plate 103 along the radial direction of the protective cover 101 outwards, so that elastic potential energy is accumulated in the elastic plate 103, and when the protective cover 101 is released, the elastic potential energy of the elastic plate 103 is released to drive the protective cover 101 to be ejected out along the axial direction of the distal end of the injection syringe 11, so that the automatic closing effect is realized;

2. when the protection cover 101 is closed, the hook back of the elastic hook 202 is jacked up by the end face of the proximal end of the elastic plate 103, so that when the protection cover 101 moves towards the proximal end, the protection cover is propped against the hook back of the elastic hook 202, and when the protection cover moves towards the distal end, the protection cover is hooked on the inner side face of the sliding opening 102 by the elastic hook 202, and a locking effect is achieved.

In order to make the elastic plate 103 lock the elastic hook 202 more firmly, further, the proximal end of the elastic plate 103 has a proximal end stop surface 103a for jacking up the elastic hook 202 when the protection cover 101 is closed, thereby locking the protection cover 101.

When the protection cover 101 is opened, a nurse is still required to pull the protection cover by hand, which is inconvenient for the injection process, and further, a distal end stop surface 103b is provided inside the elastic plate 103 for lifting up the elastic hook 202 when the protection cover 101 is opened, thereby locking the protection cover 101.

The elastic hook 202 jacks up the elastic plate 103 along the radial direction of the protective cover 101, according to the interaction principle of force, the elastic plate 103 also jacks up the elastic hook 202 along the radial direction of the protective cover 101, so that the elastic hook 202 contracts, when the elastic hook 202 passes over the far-end stop surface 103b, the elastic hook 202 rebounds and recovers to the original shape, and then hooks the far-end stop surface 103b, so that the protective cover 101 cannot slide towards the far-end direction even under the pushing action of the elastic plate 103.

In addition, when the elastic hook 202 hooks the distal stop surface 103b, a "snap" sound is generated to remind the nurse that the protection cover 101 is locked and the injection is available.

After the injection, the protection cover 101 needs to be closed, and in order to make the closing process smoother, further, the free end of the axial plate 202b expands radially outward along the mounting ring 201, and when the distal end stop surface 103b is jacked up, the elastic plate 103 is pressed or pulled radially inward along the protection cover 101, so that the stop surface 202d for opening of the axial plate 202b and the elastic hook 202 are separated from the jacked state.

When the elastic plate 103 is pulled radially outward, the distal end stop surface 103b is moved radially outward, and is thereby disengaged from the open stop surface 202d of the axial plate 202 b.

The principle of pressing the elastic plate 103 radially inward to disengage the opening stop surface 202d of the axial plate 202b from the distal stop surface 103b in the above-described process is as follows:

when the elastic plate 103 is expanded by a force, the proximal end is expanded to a greater extent than the distal end, the inner side surface of the elastic plate 103 inclines outward from the distal end to the proximal end, the axial plate 202b inclines in a manner consistent with the inner side surface of the elastic plate 103, so that when the elastic plate 103 is pressed radially inward along the shield 101, because the elastic plate 103 has a longer length, the axial plate 202b has a shorter length, and when the same distance is pressed, the axial plate 202b contracts more significantly, so that when the elastic plate is pressed to a certain extent, the opening stop surface 202d of the axial plate 202b is disengaged from the distal stop surface 103b, and the shield 101 is closed under the urging action of the elastic plate 103.

The advantage of this kind of design lies in, the nurse finishes injecting the back, as long as use two fingers of thumb and forefinger, holds between the fingers gently, just can realize closing protection casing 101, than the mode that promotes to close, holds between the fingers the mode of closing like this, need not nurse's palm application of force, also need not to remove thumb and forefinger and keep away from the palm, to the nurse that the finger is shorter little, also can realize one-hand operation, is a design promptly for ingenious. Meanwhile, the inward pinching mode is more convenient than outward poking, the angle does not need to be found, the fingernail does not need to be embedded into the sliding opening 102, and even the operation can be realized without visual observation of a nurse.

In order to make the process of the protection shield 101 passing over the elastic hook 202 smoother, further, a guiding inclined plane 105 disposed at the proximal end of the protection shield 101 is further included for guiding the elastic hook 202 into the sliding opening 102 in a sliding manner.

The inclined angle of the guiding inclined plane 105 is close to the inclined angle of the hook of the elastic hook 202, and the near end of the protective cover 101 is pushed up to drive the near end of the protective cover 101 to expand so as to cross the elastic hook 202.

A method of installing a boot on a pre-filled syringe, comprising the steps of:

s1, sleeving the mounting ring 201 on the needle mounting piece 12;

s2, continuously pushing the mounting ring 201 to pass through the inclined plane block 12b and be clamped between the inclined plane block 12b and the distal end face of the injection syringe 11, and simultaneously embedding the stop block 12d on the needle mounting piece 12 into the stop piece 201a on the mounting ring 201;

s3, the needle protection sleeve 14 is axially installed in the protection cover 101, and the protection cover 101 with the needle protection sleeve 14 is axially sleeved on the needle installation piece 12;

s4, the protective cover 101 is continuously pushed, the proximal end of the protective cover 101 is expanded and passes over the elastic hook 202, and finally the elastic hook 202 is embedded into the sliding opening 102 and hooks the protective cover 101.

The installation method can be completed by manual sleeving installation, and the installation mechanical arm can be arranged behind the injector production line to be responsible for sleeving, so that the injector production line does not need to be upgraded and changed, and the installation method is very economical and practical when being applied to the actual production process.

A pre-filled syringe assembly comprising a push rod and a piston; wherein: the push rod is arranged on the piston; the piston is installed in the syringe 11, and is used for pushing out the liquid medicine through the injection needle 13 when pushing the push rod towards the distal direction.

In the present embodiment, it is essential that the plunger and the plunger are detachably connected together, so that the plunger is easily installed in the syringe 11 in a mechanical and automatic manner, and the plunger and plunger assembling method and the medicine filling method are as follows:

s1, syringe placement: grabbing the injector body, and enabling the injection needle cylinder 11 to be in a state of being vertical to a horizontal plane, wherein the opening of the near end is upward;

in the present embodiment, the "grabbing" step generally employs a mechanical arm designed by a program, and the core of the program is to keep the syringe 11 in a vertical state when reaching the position to be filled, so that the liquid level after filling the medicine is axially vertical to the syringe 11, so that no air or less air is left after packaging but the injection process is not affected.

S2, filling medicine: filling the syringe 11 with a specified medicine;

in this embodiment, the "designated drug" refers to a drug that is self-filled according to the customer's requirement, for example, a manufacturer that fills a new coronavirus vaccine, and the designated drug is an inactivated new coronavirus.

S3, sleeve plugging: inserting the sleeve with the piston into the injection needle cylinder 11, wherein a gap is reserved between the outer annular surface of the sleeve and the inner annular surface of the injection needle cylinder 11, and then pushing the piston into the injection needle cylinder 11 along the inner annular surface of the sleeve by using a sleeve push rod;

in this embodiment, the plunger is a device for pushing medication, which is commonly used in injectors, and is typically made of medical grade rubber, and is compressed in the sleeve and expands to fit the inside of the syringe barrel 11 after leaving the sleeve.

Furthermore, the sleeve is an elongated steel tube and is inserted into the syringe barrel 11 from the crimp and the plunger is moved by means of a sleeve pusher mounted in the sleeve to a predetermined position, which is after the plunger has left the sleeve, just above the surface of the medical fluid, leaving no or little air between them and not affecting the injection process.

S4, installing a push rod: the push rod is inserted into the syringe 11 and mounted on the piston, completing the potting process.

In this embodiment, the piston has a mounting groove for mounting the push rod at the proximal end, and the push rod is rotatably inserted into the mounting groove by using a mechanical arm.

S5, performing light inspection and labeling on the filled injector, and finally completing packaging.

The installation method of the injector comprises the following steps:

s1, the needle protection sleeve 14 is axially installed in the protection cover 101;

s2, the protective cover 101 with the needle protective sleeve 14 is sleeved on the needle mounting piece 12 along the axial direction;

s3, pushing the piston into the injection needle cylinder 11;

s4, arranging the push rod on the piston.

In this embodiment, the needle protection sleeve 14 is first installed in the protection cover 101, which is beneficial to the steps of automatic assembly of syringe components, and can simplify the flow of production line, reduce the cost of component installation process, and further improve market competitiveness.

Similarly, the mounting method can also be applied to a syringe with a protective cover, and further, the protective cover pre-filling and sealing syringe assembly comprises a push rod and a piston; wherein: the push rod is arranged on the piston; the piston is installed in the syringe 11, and is used for pushing out the liquid medicine through the injection needle 13 when pushing the push rod towards the distal direction.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the claims appended hereto.

Claims

1. The utility model provides a stop ring for connecting injection cylinder and needle protective sheath thereof, characterized in that, includes collar (201), is used for cup jointing injection cylinder or its extension piece, and sets up on collar (201), and is used for the elasticity of block needle protective sheath to collude (202), elasticity collude (202) including radial board (202 a) and axial board (202 b), radial board (202 a) set up on collar (201), axial board (202 b) set up on radial board (202 a).

2. A stop ring according to claim 1, wherein the mounting ring (201) is provided with a stop (201 a) for engaging a catch on a syringe mounting site.

3. A stop ring according to claim 2, wherein the stop (201 a) communicates with the hollow inside the mounting ring (201).

4. A pre-filled syringe comprising a stop ring according to claim 3, characterized by comprising a syringe barrel (11), a needle mount (12), an injection needle (13) and a needle shield (14); wherein:

the needle mounting piece (12) is arranged at the far end of the injection needle cylinder (11), the needle mounting piece (12) is provided with a through hole (12 a) and is communicated with the inside of the injection needle cylinder (11), the injection needle (13) is mounted on the needle mounting piece (12) in a mode of being inserted into the through hole (12 a), the needle protection sleeve (14) is sleeved on the needle mounting piece (12) and completely covers the injection needle (13), and the injection needle cylinder (11), the needle mounting piece (12), the injection needle (13) and the needle protection sleeve (14) have a common axis;

the mounting ring (201) is mounted on the needle mounting piece (12) in a sleeved mode, and after mounting, the hook direction of the elastic hook (202) faces towards the near end.

5. A pre-filled syringe as claimed in claim 4, characterised in that the needle mount (12) is provided with a stop (12 d); when the mounting ring (201) is sleeved on the needle mounting piece (12), the stop block (12 d) is embedded into the stop piece (201 a).

6. A pre-filled and sealed syringe according to claim 5, characterised in that the needle mount (12) is further provided with a ramp block (12 b) which engages the distal side of the mounting ring (201).

7. A pre-filled syringe as claimed in claim 6, characterised in that the ramp block (12 b) has a mounting ramp (12 c) at its distal end.

8. A shield comprising a pre-filled syringe according to any one of the claims 6, characterized by a shield (101) on which a sliding opening (102) is provided to shield the injection needle (13), while the resilient hooks (202) extend into the sliding opening (102) to secure the shield (101).

9. Protective hood according to claim 8, characterized in that the protective hood (101) is further provided with a resilient plate (103), the resilient plate (103) being cantilevered on the inner side of the sliding opening (102), the proximal end having a tendency to retract radially inwards of the protective hood (101).

10. Protective hood according to claim 9, so characterized in that the elastic plate (103) has a proximal stop surface (103 a) at its proximal end for lifting the elastic hook (202) when the protective hood (101) is closed, thereby locking the protective hood (101).

11. Protective hood according to claim 9, characterized in that the elastic plate (103) is provided with a distal stop surface (103 b) on the inside for lifting the elastic hook (202) when the protective hood (101) is opened, thereby locking the protective hood (101).

12. Protective hood according to claim 11, characterized in that the free end of the axial plate (202 b) is expanded radially outwards along the mounting ring (201) and, when the distal stop surface (103 b) is lifted, the stop surface (202 d) for opening of the axial plate (202 b) is disengaged from the lifting condition of the elastic hook (202) by pressing or pulling the elastic plate (103) radially inwards along the protective hood (101).

13. Protective hood according to claim 8, further comprising a guiding bevel (105) arranged at the proximal end of the protective hood (101) for sliding guiding the resilient hook (202) into the sliding opening (102).

14. A method of installing a protective cover according to any one of claims 8 to 13, comprising the steps of:

s1, sleeving the mounting ring (201) on the needle mounting piece (12);

s2, continuously pushing the mounting ring (201) to pass through the inclined plane block (12 b) and be clamped between the inclined plane block (12 b) and the distal end face of the injection syringe (11), and simultaneously embedding the stop block (12 d) on the needle mounting piece (12) into the stop piece (201 a) on the mounting ring (201);

s3, the needle protection sleeve (14) is axially installed into the protection cover (101), and the protection cover (101) with the needle protection sleeve (14) is axially sleeved on the needle installation piece (12);

s4, the protective cover (101) is continuously pushed, the proximal end of the protective cover (101) is expanded and passes over the elastic hook (202), and finally the elastic hook (202) is embedded into the sliding opening (102) and hooks the protective cover (101).

15. An assembly comprising the pre-filled syringe of any one of claims 4 to 7, comprising a plunger and a piston; wherein: the push rod is arranged on the piston; the piston is arranged in the injection syringe (11) and is used for pushing out the liquid medicine through the injection needle (13) when pushing the push rod towards the far end direction.

16. An assembly comprising the shield of any one of claims 8 to 13, including a push rod and a piston; wherein: the push rod is arranged on the piston; the piston is arranged in the injection syringe (11) and is used for pushing out the liquid medicine through the injection needle (13) when pushing the push rod towards the far end direction.