CN220046716U - Protector for syringe and safety syringe thereof - Google Patents

Abstract

The utility model relates to a protective device for an injector and a safety injector thereof, which comprises a shell, a protective inner sleeve, an excitation ring and a spring, wherein the shell is provided with a protective sleeve; the protection inner sleeve is positioned in the inner sleeve accommodating cavity of the shell, and the spring is positioned between the boss of the protection inner sleeve and the spring seat of the excitation ring; the excitation ring is positioned at the upper part, and the excitation ring is positioned above the excitation elastic sheet before excitation. A safety syringe having a disposable prefilled syringe mounted therein; the flange of the injector needle cylinder is arranged in the mounting table and is positioned above the excitation ring; the needle cylinder is positioned in the injector accommodating cavity of the protective inner sleeve. The protective device for the injector has a simple structure and is easy to process and manufacture; the final safety syringe has the advantages of convenient assembly, simple and convenient operation and good protection effect.

Description

Protector for syringe and safety syringe thereof

Technical Field

The utility model relates to a protective device for providing a needle head protective function for a disposable prefilled syringe and a safety syringe formed by adopting the protective device, belonging to the field of medical injection instruments.

Background

The inventor previously applied for a safety syringe with a Chinese patent publication No. CN111888580A and a needle protection device for the safety syringe with a Chinese patent publication No. CN111888581A, designed a special needle protection device, when the disposable syringe is used, the syringe (containing medicament) is arranged in the protection device, then after the medicine pushing injection process is finished, the protection device is excited, a protective sleeve is ejected, the needle of the syringe is protected, and the needle of the syringe is shielded, so that accidents such as hurting people and the like caused by the needle of the syringe after the use are prevented.

However, a safety syringe of chinese patent publication No. CN111888580a needs to use a special syringe piston rod, and is activated by a release activation piece on the piston rod, which may require the pharmaceutical manufacturing enterprise to replace the piston rod of the syringe, resulting in some inconvenience. On the basis, the Chinese patent publication No. CN218187476U prevents the stab protection device, reduces the requirement on the piston rod, but requires additional operation for excitation; the excitation action is separated from the injection action, and the excitation device can be misoperated before injection to directly excite, so that the injection of the medicament can not be performed.

The needle head protection device for the safety syringe with the Chinese patent publication No. CN111888581A is provided with a guide groove with a relatively complex structure, the production and manufacturing difficulties are relatively high, and the assembly process is relatively complex.

Therefore, there is a need for further improvements in needle protection devices for safety syringes that simplify handling and reduce the requirements on the syringe itself, as well as ease of manufacture and assembly.

Disclosure of Invention

The utility model aims to provide a protective device for a syringe and a safety syringe formed by sampling the protective device for the syringe, and the integral structure of the protective device is improved, so that the requirement on the syringe is simplified, and the protective device is matched with a conventional disposable prefilled syringe; the parts of the protection device have simple structure and are easy to manufacture and assemble; in addition, the protective device is convenient to assemble with the injector in the use process, and the excitation operation process is also convenient, so that false excitation is avoided.

In order to achieve the above object, according to a first aspect of the present utility model, there is provided a protector for a syringe, comprising a housing, a protective inner sleeve, an energizing ring, and a spring;

the shell is provided with a shell body of a thin-wall cylinder barrel, a cylindrical inner sleeve accommodating cavity is arranged in the shell body, and the inner sleeve accommodating cavity is vertically communicated; handle fins extending outwards from two sides are arranged above the shell; the top of the shell is provided with a mounting table which is of a hollow structure, and a hollow movable space is formed above the handle wing pieces; the upper part of the shell is provided with an excitation spring piece, and the lower part of the shell is provided with a locking spring piece;

the excitation spring piece is a cantilever spring piece arranged along the outer wall of the shell, is provided with 2 parts and is symmetrically arranged on the shell; the fixed end of the excitation spring plate is arranged along the axial direction of the shell, and the other 3 surfaces of the excitation spring plate are hollowed out to form an elastic deformation space; the inner side of the excitation spring plate is provided with an excitation boss and a fixing boss along the axial direction of the shell; the excitation boss is positioned at the upper part of the excitation elastic sheet; the fixing boss is positioned at the lower part of the excitation spring plate and is provided with a plane which is horizontally arranged inwards; the excitation boss and the fixing boss synchronously move outwards with the same deformation along with the excitation elastic sheet;

the locking spring piece is a cantilever spring piece arranged along the outer wall of the shell, is provided with 2 parts and is symmetrically arranged on the shell; the fixed end of the locking spring plate is arranged along the radial direction of the shell, the fixed end of the locking spring plate is positioned above, and the lower part of the locking spring plate is a movable end; the inner side of the lower part of the locking spring plate is protruded to form a locking boss; the bottom surface of the locking spring plate is a plane which is horizontally arranged; the part of the inner side of the shell below the locking elastic piece extends inwards to form a limiting boss, and a hollowed-out area between the limiting boss and the locking elastic piece forms a locking cavity;

the protective inner sleeve is a thin-wall cylindrical barrel, and a cylindrical syringe accommodating cavity is arranged on the inner side of the protective inner sleeve; the upper wall surface of the protective inner sleeve is outwards protruded to form a boss;

the excitation ring is a thin-walled cylinder, and a cylindrical spring accommodating cavity is arranged on the inner side of the excitation ring; the top wall of the excitation ring protrudes inwards to form a spring seat;

the spring is a compression spring and is always in a compression state;

the protective inner sleeve is positioned in the inner sleeve accommodating cavity of the shell, the lower surface of the excitation front boss is contacted with the upper surface of the fixing boss, and the protective inner sleeve is temporarily fixed in the inner sleeve accommodating cavity; after excitation, the boss is positioned in the locking cavity, and the lower part of the protective inner sleeve protrudes out of the shell;

the spring is positioned between the boss of the protective inner sleeve and the spring seat of the excitation ring;

the excitation ring is positioned at the upper part, and the excitation ring is positioned above the excitation elastic sheet before excitation.

As a further improvement of the utility model, 2 elastic sheets are arranged at each position on the shell, and the movable ends of the 2 excitation elastic sheets at each position are close to each other and share the same hollow groove.

As a further improvement of the utility model, the excitation boss on the excitation spring plate is provided with a guide inclined plane which is arranged from top to bottom inwards.

As a further improvement of the utility model, the locking boss of the locking spring plate is provided with a guiding inclined plane which is arranged from top to bottom inwards.

In a first aspect of the utility model, there is provided a safety syringe comprising a guard for a syringe as described above, in which a disposable pre-filled syringe is mounted;

the flange of the injector needle cylinder is arranged in the mounting table and is positioned above the excitation ring; the needle cylinder is positioned in the injector accommodating cavity of the protective inner sleeve.

As a further improvement of the utility model, the length of the push rod is longer than the length of the needle cylinder;

after the injection of the medicament in the needle cylinder is finished, the push head of the push rod is positioned above the mounting table or positioned at the upper part of the mounting table.

The utility model mainly improves the protective device for the injector, and further combines with the disposable prefilled injector to form the safety injector, which can be conveniently matched with the conventional disposable prefilled injector, and the flange of the conventional injector can be conveniently installed and fixed and is also convenient to assemble by reasonably designing the installation table; the final excitation of the protective device is required to rely on the full use of the medicament in the prefilled syringe, and the piston is utilized to push the needle cylinder and drive the flange to push the excitation ring for excitation, so that the false triggering of the protective device is avoided; and the force application process of the excitation process is completely consistent with the medicine pushing injection process, and no additional operation steps are needed, so that the method is simple and convenient.

The protective device for the injector has a simple structure and is easy to process and manufacture; the final safety syringe has the advantages of convenient assembly, simple and convenient operation and good protection effect.

Drawings

FIG. 1 is a view showing the overall structure of a protector for an injector according to the present utility model;

FIG. 2 is an exploded view of the components of a guard for a syringe according to the present utility model;

FIG. 3 is a schematic view showing the internal structure of a protector for a syringe according to the present utility model;

FIG. 4 is a schematic view of the overall structure of the housing;

FIG. 5 is a schematic view of a partial structure of a housing 1;

FIG. 6 is a partial schematic view of the housing 2;

FIG. 7 is a view showing the overall structure of a safety syringe (before use) according to the present utility model;

fig. 8 is a schematic view showing the internal structure of a safety syringe (before use) according to the present utility model:

FIG. 9 is a schematic view of the activation of the safety device after injection of the safety syringe according to the present utility model;

FIG. 10 is a schematic view showing the internal structure of the guard of the safety syringe after being fully unfolded;

FIG. 11 is a view of the entire structure of the safety syringe guard of FIG. 1 after complete deployment;

fig. 12 is a fully developed overall structure of the guard of the safety syringe of the present utility model, and is a view of fig. 2.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

The protective device for the injector has the advantages that the overall appearance of the combined state is shown in fig. 1, the explosion diagram of parts is shown in fig. 2, and the internal structure of the combined state is shown in fig. 3 (the sectional illustration of fig. 1); the utility model relates to a protective device for an injector, which specifically comprises a shell 1, a protective inner sleeve 2, an excitation ring 3 and a spring 4.

As shown in fig. 4, the shell 1 is provided with a shell 11 with a thin-wall cylinder, a cylindrical inner sleeve accommodating cavity 12 is arranged in the shell 11, and the inner sleeve accommodating cavity 12 is communicated up and down; handle fins 13 extending to the outside of both sides are arranged above the shell 11; the top of the shell 1 is provided with a mounting table 14 which is of a hollow structure, and a hollow movable space 141 is formed above the handle wing pieces 13; an exciting spring piece 15 is provided at the upper part of the housing 11, and a locking spring piece 16 is provided at the lower part of the housing 11.

The specific structure of the excitation spring 15 is shown in fig. 5, and is a cantilever spring arranged along the outer wall of the shell 11, 2 positions are arranged and symmetrically arranged on the shell 11; the fixed end of the excitation spring piece 15 is arranged along the axial direction of the shell 11, and the other 3 surfaces of the excitation spring piece 15 are hollowed out to form an elastic deformation space; 2 elastic sheets are preferably arranged at each position, and the movable ends of the 2 excitation elastic sheets 15 at each position are close to each other and share the same hollow groove; the inner side of the excitation spring 15 is provided with an excitation boss 151 and a fixing boss 152 along the axial direction of the shell 11, wherein the excitation boss 151 is positioned at the upper part of the excitation spring 15 and is a guide inclined plane which is downwards and inwards arranged, and the fixing boss 152 is positioned at the lower part of the excitation spring 15 and is a plane which is horizontally arranged; when the excitation spring 15 is elastically deformed, the excitation boss 151 and the fixing boss 152 located inside the excitation spring 15 realize synchronous and outward movement with the same deformation amount.

As shown in fig. 6, the specific structure of the locking spring piece 16 is a cantilever spring piece arranged along the outer wall of the shell 11, and 2 parts are arranged and symmetrically arranged on the shell 11; the fixed end of the locking spring piece 16 is arranged along the radial direction of the shell 11, the fixed end of the locking spring piece 16 is preferably positioned above, and the lower part of the locking spring piece 16 is a movable end; the inner side of the lower part of the locking spring piece 16 is protruded to form a locking boss 161, and the locking boss 161 is a guide inclined surface which is arranged downwards and inwards; the bottom surface of the locking spring plate is a plane which is horizontally arranged; further, the portion of the inner side of the housing 11 below the locking spring 16 extends inward to form a limiting boss 17, and a hollow area between the limiting boss 17 and the locking spring 16 forms a locking cavity 162 (shown in fig. 5).

The protective inner sleeve 2 is a thin-walled cylinder barrel, and a cylindrical syringe accommodating cavity 21 is arranged on the inner side of the protective inner sleeve 2 as shown in fig. 2; the upper wall surface of the protective inner sleeve 2 is protruded outwards to form a boss 22.

The excitation ring 3, as shown in fig. 2, is also a thin-walled cylinder barrel, and a cylindrical spring accommodating cavity 31 is arranged on the inner side of the excitation ring; the top wall of energizing ring 3 is inwardly convex forming a spring seat 32.

The spring 4 is a compression spring, and is always in a compressed state in the utility model, and provides elastic force outwards on the upper side and the lower side.

The protective device for the injector of the utility model comprises the following components:

(1) Firstly taking a shell 1;

(2) Then taking the protective inner sleeve 2, plugging the lower part of the protective inner sleeve 2 from the upper part of the shell 1, penetrating through the mounting table 14, completely entering the inner sleeve accommodating cavity 12, extruding the excitation boss 151 at the upper part of the excitation elastic sheet 15 by the boss 22, and then reaching the fixing boss 152 at the lower part of the excitation elastic sheet 15, wherein the lower surface of the boss 22 is contacted with the upper surface of the fixing boss 152, so that the protective inner sleeve 2 is temporarily fixed;

(3) Taking the spring 4, inserting the bottom of the spring 4 from the upper part of the shell 1, penetrating through the mounting table 14 and sleeving the spring 4 outside the upper part of the protective inner sleeve 2, and abutting the bottom of the spring 4 on the upper surface of the boss 22;

(4) Taking the energizing ring 3, aligning the lower part of the energizing ring 3 with the top of the spring 4, accommodating the upper part of the spring 4 into the spring accommodating cavity 31, and abutting the top surface of the spring 4 on the lower surface of the spring seat 32;

the assembly of the protective device for the injector is completed; at this time, the energizing ring 3 is pressed downward, so that the spring 4 is compressed until the energizing ring 3 is completely entered into the mounting table 14, and the album is assembled as shown in fig. 1 and 3.

Since the outer side wall surface of the energizing ring 3 of the protector for the syringe of the present utility model has no projection, it cannot be fixed with the mounting table 14 in a limited manner, and therefore, it is necessary to mount the syringe while maintaining the compressed state of the spring 4.

As shown in fig. 7 and 8, the prefilled syringe is assembled with a protective device for a syringe of the present utility model to form a safety syringe of the present utility model; taking the injector, inserting the needle 54 end of the needle cylinder 51 from the upper part of the shell 1, penetrating the mounting table 14, the excitation ring 3 and the spring 4 into the injector accommodating cavity 21 of the protective inner sleeve 2, and enabling the needle cylinder 51 to be positioned in the injector accommodating cavity 21; carefully (or by using a special tool) inserting the flange 512 at the top of the syringe 51 into the mounting table 14, and elastically deforming the mounting table 14 during the process to allow the flange 512 to pass over, so that the flange 512 reaches the movable space 141, and the bottom surface of the flange 512 contacts the top surface of the energizing ring 3; the spring 4 provides elastic force to press the top surface of the flange 512 against the top of the movable space 141, and is limited by the mounting body at the upper part of the mounting table 14. At this time, the plunger 52 of the syringe is not pushed, and the piston 53 at the bottom of the plunger 52 is located at the upper portion of the cylinder 51, in which the medicine is stored.

When the safety syringe of the utility model is used, similar to a common syringe, the shell 1 is grasped, the needle 54 is pricked into a patient, and the downward force grasping the shell 1 in the process is completely applied to the needle 54 through the mounting table 14, the flange 512 and the syringe 51; then the finger is buckled on the lower part of the handle wing 13, the other 1 finger is abutted against the pushing head 521 at the top of the pushing rod 52 to apply force, the pushing rod 52 pushes the piston 53 at the bottom to move in the medicament cavity 511 of the syringe 51, the volume of the medicament cavity 511 is compressed, and then the medicament stored in the medicament cavity 511 is injected into a patient through the needle 54.

As shown in fig. 9, after the injection of the medicine is completed, the safety syringe of the present utility model drives the syringe to move upward integrally, so as to withdraw the needle 54 from the patient; at this time, however, the piston 53 is abutted against the bottom of the medicine chamber 511, the finger on the pushing head 521 continues to apply force to the pushing head 521 (the length of the pushing rod 52 is longer than that of the syringe 51, so that after the medicine is injected, the pushing rod 52 is further located above or on the mounting table 14 with the pushing head 521, the finger can operate to push the pushing head 521), the pushing rod 52 pushes the piston 53 against the syringe 51, and applies a pushing force to the syringe 51, so that the syringe 51 moves downward; and then drives the flange 512 to move downwards, and then the flange 512 pushes the energizing ring 3 to move downwards, and the spring 4 is compressed; in the downward movement process of the excitation ring 3, the bottom of the excitation ring 3 contacts with the excitation boss 151, and particularly abuts against the guide inclined plane of the excitation boss 151 (as shown in fig. 3, before being used, the bottom of the excitation ring 3 is located above the excitation boss 151), and because the rigidity of the excitation ring 3 is better, and the excitation boss 151 is located on the excitation elastic sheet 15, the excitation ring 3 continues to move downward, the guide inclined plane of the excitation boss 151 is pushed, so that the excitation elastic sheet 15 is opened outwards, and the fixing boss 152 also moves outwards in the process and gradually breaks away from the boss 22 of the protection inner sleeve 2.

When the fixing boss 152 is fully opened outwards along with the excitation spring piece 15 and is completely separated from the boss 22, the boss 22 is not limited any more, and the spring 4 starts to release to prop against the upper surface of the boss 22, so that the protective inner sleeve 2 is pushed downwards relative to the outer shell 1; until the boss 22 contacts with the locking spring piece 16 at the lower part of the shell 1, under the action force of the spring 4, the boss 22 pushes the guiding inclined plane of the locking boss 161 to enable the locking spring piece 16 to open outwards until the boss 22 passes through the locking spring piece 16 to enter the locking cavity 162 and finally to be propped against the limiting boss 17, the boss 22 is completely positioned in the locking cavity 162, the locking spring piece 16 is reset, the locking boss 161 is clamped above the boss 22, the boss 22 is clamped in the locking cavity 162 through the limiting boss 17 and the locking spring piece 16, and then the protective inner sleeve 2 is fixed on the shell 1. The part of the protective inner sleeve 2, which exceeds the shell 1, completely shields the needle 54, so that the needle 54 of the used syringe can be shielded; at this time, even if the protective inner sleeve 2 is biased, the protective inner sleeve 2 cannot be retracted into the housing 1, and safety can be ensured, as shown in fig. 10, 11, and 12.

However, after the external force is completely removed, the upper part of the spring 4 pushes the energizing ring 3 to reset upwards, and the flange 512, the needle cylinder 51 and the needle 54 are moved upwards for a small distance; of course, if the friction between the excitation spring 15 and the excitation ring 3 is large enough to be greater than the elastic force of the spring 4, then the excitation ring 3 may also stay in the excitation boss 151 of the excitation spring 15; and the flange 512 lacks a limit, so that free movement can be performed in the movement space 141.

While the preferred embodiments of the present utility model have been described in detail, the present utility model is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (6)

1. The protective device for the injector is characterized by comprising a shell, a protective inner sleeve, an excitation ring and a spring;

the shell is provided with a shell body of a thin-wall cylinder barrel, a cylindrical inner sleeve accommodating cavity is arranged in the shell body, and the inner sleeve accommodating cavity is vertically communicated; handle fins extending outwards from two sides are arranged above the shell; the top of the shell is provided with a mounting table which is of a hollow structure, and a hollow movable space is formed above the handle wing pieces; the upper part of the shell is provided with an excitation spring piece, and the lower part of the shell is provided with a locking spring piece;

the excitation spring piece is a cantilever spring piece arranged along the outer wall of the shell, is provided with 2 parts and is symmetrically arranged on the shell; the fixed end of the excitation spring plate is arranged along the axial direction of the shell, and the other 3 surfaces of the excitation spring plate are hollowed out to form an elastic deformation space; the inner side of the excitation spring plate is provided with an excitation boss and a fixing boss along the axial direction of the shell; the excitation boss is positioned at the upper part of the excitation elastic sheet; the fixing boss is positioned at the lower part of the excitation spring plate and is provided with a plane which is horizontally arranged inwards; the excitation boss and the fixing boss synchronously move outwards with the same deformation along with the excitation elastic sheet;

the locking spring piece is a cantilever spring piece arranged along the outer wall of the shell, is provided with 2 parts and is symmetrically arranged on the shell; the fixed end of the locking spring plate is arranged along the radial direction of the shell, the fixed end of the locking spring plate is positioned above, and the lower part of the locking spring plate is a movable end; the inner side of the lower part of the locking spring plate is protruded to form a locking boss; the bottom surface of the locking spring plate is a plane which is horizontally arranged; the part of the inner side of the shell below the locking elastic piece extends inwards to form a limiting boss, and a hollowed-out area between the limiting boss and the locking elastic piece forms a locking cavity;

the protective inner sleeve is a thin-wall cylindrical barrel, and a cylindrical syringe accommodating cavity is arranged on the inner side of the protective inner sleeve; the upper wall surface of the protective inner sleeve is outwards protruded to form a boss;

the excitation ring is a thin-walled cylinder, and a cylindrical spring accommodating cavity is arranged on the inner side of the excitation ring; the top wall of the excitation ring protrudes inwards to form a spring seat;

the spring is a compression spring and is always in a compression state;

the protective inner sleeve is positioned in the inner sleeve accommodating cavity of the shell, the lower surface of the excitation front boss is contacted with the upper surface of the fixing boss, and the protective inner sleeve is temporarily fixed in the inner sleeve accommodating cavity; after excitation, the boss is positioned in the locking cavity, and the lower part of the protective inner sleeve protrudes out of the shell;

the spring is positioned between the boss of the protective inner sleeve and the spring seat of the excitation ring;

the excitation ring is positioned at the upper part, and the excitation ring is positioned above the excitation elastic sheet before excitation.

2. The protective device for an injector according to claim 1, wherein 2 spring plates are arranged at each position on the housing, and movable ends of the 2 excitation spring plates at each position are close to each other and share the same hollow groove.

3. The guard of claim 1, wherein the trigger boss of the trigger spring has a guide slope disposed inwardly from top to bottom.

4. The guard for an injector of claim 1, wherein the locking tab of the locking spring is provided with a guide slope disposed inwardly from top to bottom.

5. A safety syringe comprising a protector for a syringe according to any one of claims 1 to 4, in which a disposable prefilled syringe is mounted;

the flange of the injector needle cylinder is arranged in the mounting table and is positioned above the excitation ring; the needle cylinder is positioned in the injector accommodating cavity of the protective inner sleeve.

6. A safety syringe according to claim 5 wherein the length of the plunger is longer than the length of the barrel;

after the injection of the medicament in the needle cylinder is finished, the push head of the push rod is positioned above the mounting table or positioned at the upper part of the mounting table.