A safety injection device

Abstract

The application discloses a safe injection device, and particularly relates to the technical field of injection, which comprises an outer shell body, a support is slidably arranged in the barrel of the outer shell body, a needle cylinder is connected to the support, a spring is arranged in the inner cavity of the non-flange end of the outer shell body and always abuts against the support, the flange end of the support is clamped by the elastic baffle of the outer shell body, a push rod is arranged on the needle cylinder and matched with the elastic baffle, the support is provided with a plurality of radially extending T-shaped limiting feet, the outer shell body is provided with a plurality of through grooves matched with the movement of the limiting feet, the through grooves of the outer shell body are extended with extension plates matched with the linear movement of the limiting feet, and the extension plates are provided with fixed notches matched with the clamping of the limiting feet at the flange end of the outer shell body. The double-guide rail design is adopted between the outer shell body and the support, and the sliding is smooth. After the safety device is activated, the needle of the needle cylinder is retracted into the outer shell body, and the probability of the needle pricking the medical staff or the patient is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of injection technology, specifically relating to a safe injection device. Background Technology

[0002] Pre-filled or pre-filled syringes are commonly used for drug injection. They generally consist of a hollow barrel and plunger, as well as a needle and needle cap. In injection procedures, to protect patients and users from needlestick injuries, especially between the completion of the injection and the disposal of the drug delivery device, a post-injection safety device is required to prevent needlestick injuries. Furthermore, considering environmental and cost factors, the safety device should have few parts, be made of uniform materials, and be easy to assemble.

[0003] Chinese Patent CN104411351B discloses a safety device for a cartridge, comprising four parts: a main body (support) for receiving the cartridge; a protective element (outer shell) for covering used needles; a plunger for injecting medication from the cartridge; and a spring. The main body's stop tongue only restricts the main body to slide linearly axially relative to the protective element. Other directional (e.g., radial) positional constraints depend on the fit between the main body's outer contour and the inner wall of the protective element. Maintaining a high-precision fit across multiple aspects is difficult. When the main body deforms, the stop tongue easily detaches from the window of the protective element, making the sliding of the main body relative to the protective element unsmooth. In the described embodiment, to avoid accidental triggering during assembly, the trigger fingers are spaced apart so that the cartridge flange does not contact the trigger fingers during assembly. However, this does not address the risk of the plunger being activated due to vibration or foreign object contact during packaging, transportation, or unsealing.

[0004] Therefore, a new type of safe injection device is needed. Summary of the Invention

[0005] To address the aforementioned problems, this utility model discloses a safe injection device.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A safety injection device includes a housing, a bracket slidably mounted inside the housing, a syringe being engaged with the bracket, a spring that always presses against the bracket in the inner cavity of the non-flange end of the housing, and the flange end of the bracket being held in place by an elastic baffle of the housing, the syringe being equipped with a push rod adapted to the elastic baffle, the bracket being provided with a plurality of radially extending T-shaped limiting feet, and the housing being provided with a plurality of through grooves adapted to the movement of the limiting feet, an extension plate extending into the through grooves of the housing to adapt to the linear movement of the limiting feet, and the extension plate having a fixing notch at the flange end of the housing to adapt to holding the limiting feet.

[0008] As a preferred embodiment of this utility model, the limiting foot is located at the non-flange end of the bracket, and the connection between the limiting foot and the bracket body is narrowed.

[0009] As a preferred technical solution of this utility model, the through groove of the outer shell is provided with an insertion notch at its non-flange end for a limiting foot to be inserted into the through groove, and the outer shell is provided with elongated through holes on both sides of the fixing notch.

[0010] As a preferred embodiment of this utility model, the flange end of the bracket extends out to form a fixing plate, and the end of the elastic baffle is engaged with the fixing plate. The end of the elastic baffle is provided with an oblique angle adapted to the pressing deflection of the end of the push rod.

[0011] As a preferred embodiment of this utility model, the flange end of the bracket extends into a safety frame, and the safety frame is longer than the elastic baffle. The end of the safety frame is C-shaped, and the opening of the C-shaped end faces the push rod. The two connection points between the end of the safety frame and the safety frame rod are narrowed. The middle of the C-shaped end of the safety frame prevents the end of the elastic baffle from deflecting.

[0012] As a preferred embodiment of this utility model, the narrowed portion of the safety frame is provided with a pivot, the flange end of the outer shell extends into an auxiliary frame, and the auxiliary frame is provided with a notch adapted to the pivot.

[0013] As a preferred embodiment of this utility model, the bracket extends out with several elastic snap-fit ​​plates, and the elastic snap-fit ​​plates have notches adapted to the syringe flange.

[0014] A safe injection device includes a housing, a bracket slidably mounted inside the housing, a syringe being engaged with the bracket, a spring that always presses against the bracket in the inner cavity of the non-flange end of the housing, and the flange end of the bracket being held in place by an elastic baffle of the housing, the syringe being equipped with a push rod adapted to the elastic baffle, a fixing plate extending from the flange end of the bracket, and the end of the elastic baffle engaging the fixing plate, the end of the elastic baffle being provided with an angle adapted to the deflection of the push rod end when pressed.

[0015] As a preferred embodiment of this utility model, the flange end of the bracket extends out into a safety frame, and the safety frame is longer than the elastic baffle. The end of the safety frame is C-shaped, and the opening of the C-shaped end faces the push rod. The two connection points between the end of the safety frame and the safety frame rod are narrowed. The end of the elastic baffle is provided with an oblique angle that is pressed down by the middle of the C-shaped end of the safety frame.

[0016] As a preferred embodiment of this utility model, the narrowed portion of the safety frame is provided with a pivot, the flange end of the outer shell extends into an auxiliary frame, and the auxiliary frame is provided with a notch adapted to the pivot.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The outer shell and the bracket of this application adopt a double guide rail design. Under the restriction of the guide rail, the bracket retains a direction of movement (sliding direction) to ensure smooth sliding when the safety device is activated (the limiting foot is difficult to disengage from the through groove of the outer shell). After the safety device is activated, the bracket moves under the elastic force of the spring, causing the needle of the syringe to retract into the outer shell. The limiting foot of the bracket is finally locked into the fixing notch, making it difficult for the needle of the syringe to extend out of the outer shell again, reducing the probability of needle pricking medical staff or patients.

[0019] Second, this application is equipped with a safety frame. The elastic baffle cannot be triggered before the safety frame is pressed, which is safe and reliable. The pressing action of the safety frame and the elastic baffle is part of the injection action. No additional action is required to complete the triggering. It is easy to operate, does not affect the drug injection, and is not easy to be accidentally triggered.

[0020] Third, in this application, the safety frame and the elastic baffle are part of the bracket and the outer shell, respectively, and are not independent parts, which facilitates one-time production and reduces assembly steps. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model before activation;

[0022] Figure 2 This is a schematic diagram of the outer shell of an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the bracket according to an embodiment of the present utility model;

[0024] Figure 4 This is a partial cross-sectional view of the activated front housing and bracket according to an embodiment of the present invention;

[0025] Figure 5 This is an overall sectional view of the present invention before activation.

[0026] Figure 6 This is a schematic diagram of the structure after activation in an embodiment of this utility model.

[0027] List of identifiers in attached diagrams:

[0028] 1. Outer shell; 101. Snap-in notch; 102. Extension plate; 103. Fixing notch; 104. Long through hole; 105. Auxiliary frame; 106. Elastic baffle;

[0029] 2. Bracket; 201. Limiting foot; 202. Safety frame; 203. Rotating shaft; 204. Fixing plate; 205. Flexible snap-fit ​​plate;

[0030] 3. Syringe;

[0031] 4. Spring;

[0032] 5. Needle cap;

[0033] 6. Push rod. Detailed Implementation

[0034] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0035] Please see Figure 1-6 A safe injection device includes a housing 1, a bracket 2 slidably mounted inside the housing 1, and a syringe 3 engaged with the bracket 2. A spring 4, which always presses against the bracket 2, is provided in the inner cavity of the non-flange end of the housing 1, and the flange end of the bracket 2 is held in place by an elastic baffle 106 of the housing 1. The syringe 3 is equipped with a push rod 6 adapted to the elastic baffle 106. The bracket 2 is provided with several radially extending T-shaped limiting feet 201, and the housing 1 is provided with several through slots adapted to the movement of the limiting feet 201. The limiting feet 201 and the through slots cooperate to allow the bracket 2 to slide stably. In the embodiment shown in the attached drawings, the housing 1 has two through slots, and the bracket 2 has two limiting feet 201. The syringe 3 is exposed at the cutouts of the housing 1 and the bracket 2 to observe the remaining amount of liquid in the syringe 3. The through slots of the housing 1 have engagement notches 101 at their non-flange ends, allowing the limiting feet 201 to engage with the through slots. The snap-in notch 101 is not mandatory. Its presence facilitates the assembly of the limiting foot 201. Even without the snap-in notch 101, the T-shaped limiting foot 201 can be forcibly inserted into the sliding groove of the housing 1 (by forcibly stretching and deforming the plastic of the housing 1). An extension plate 102 extends within the groove of the housing 1, adapting to the linear movement of the limiting foot 201. The extension plate 102 has a fixing notch 103 at the flange end of the housing 1, adapted to engage the limiting foot 201. The extension plate 102 conforms to multiple outer surfaces of the limiting foot 201. The housing 1 has elongated through holes 104 on both sides of the fixing notch 103. The fixing notch 103 is formed on the extension plate 102. When the limiting foot 201 snaps into the fixing notch 103, the extension plate 102 undergoes elastic deformation. The elongated through holes 104 provide space for the elastic deformation of the extension plate 102.

[0036] The limiting foot 201 is located at the non-flange end of the bracket 2. The connection between the limiting foot 201 and the main body of the bracket 2 is narrowed, and the narrowed part can undergo elastic deformation so that the bracket 2 can be inserted into the cylinder of the outer shell 1.

[0037] A fixing plate 204 extends from the flange end of the bracket 2, and the end of the elastic baffle 106 is engaged with the fixing plate 204. The end of the elastic baffle 106 is provided with an oblique angle adapted to the pressing deflection of the end of the push rod 6. The end of the push rod 6 is provided with several pressing plates perpendicular to its own axis. The bracket 2 is symmetrically provided with two fixing plates 204 about itself. In the embodiment shown in the figure, the push rod 6 is provided with two pressing plates. When the pressing plates press the oblique angle of the end of the elastic baffle 106, the elastic baffle 106 deflects, and the end of the elastic baffle 106 disengages from the fixing plate 204. The bracket 2 moves under the elastic force of the spring 4, causing the needle of the syringe 3 to retract into the outer shell 1.

[0038] A safety frame 202 extends from the flange end of bracket 2, and the safety frame 202 is longer than the elastic baffle 106 so that the pressing plate of push rod 6 contacts and presses the safety frame 202 before pressing the elastic baffle 106. The end of the safety frame 202 is C-shaped, and the opening of the C-shaped end faces push rod 6. The C-shaped end of the safety frame 202 is fixedly connected to the flange of bracket 2 via two rods of the safety frame 202, and both connection points between the end of the safety frame 202 and the rod of the safety frame 202 are narrowed. The middle of the C-shaped end of the safety frame 202 prevents the end of the elastic baffle 106 from deflecting. A pivot 203 is provided at the narrowed part of the safety frame 202, and an auxiliary frame 105 extends from the flange end of the outer casing 1, and the auxiliary frame 105 is provided with a notch adapted to the pivot 203. Two safety frames 202 are symmetrically arranged about the flange end of bracket 2, and two auxiliary frames 105 are symmetrically arranged about the flange end of the outer casing 1. When the push plate of push rod 6 presses the safety frame 202, the safety frame 202 deforms from its narrowing point, causing the C-shaped end of the safety frame 202 to deflect before it can continue to press the end angle of the elastic baffle 106 (at this time, the middle part of the C-shaped end moves away from blocking the end of the elastic baffle 106). When the safety frame 202 deforms from its narrowing point, the rotating shaft 203 rotates within the notch of the auxiliary frame 105, wherein a gap is provided between the rotating shaft 203 and the notch of the auxiliary frame 105 to accommodate the deformation of the safety frame 202.

[0039] The needle of the syringe 3 is fitted with a needle cap 5, in which the needle is inserted into the sterile needle cap 5 for protection.

[0040] The bracket 2 extends out with several elastic snap-fit ​​plates 205, and each elastic snap-fit ​​plate 205 has a notch for fitting the flange of the syringe 3. In the embodiment shown in the attached figure, the flange of the bracket 2 has two elastic snap-fit ​​plates 205 on each side of the syringe 3. When the elastic snap-fit ​​plate 205 snaps into the syringe 3, the elastic snap-fit ​​plate 205 first undergoes elastic deformation and then snaps the flange of the syringe 3 into its notch.

[0041] Working principle:

[0042] When in use, the needle cap 5 is removed and the injection is given to the patient. Just before the injection, the pressing plate of the push rod 6 presses the safety frame 202 first. The safety frame 202 deforms from its narrowing part, causing the C-shaped end of the safety frame 202 to deflect (at this time, the middle part of the C-shaped end moves away from the obstruction of the end of the elastic baffle 106, so that the end of the elastic baffle 106 has the deformation space to detach from the fixed plate 204). Then the pressing plate of the push rod 6 continues to press the end angle of the elastic baffle 106, causing the elastic baffle 106 to deflect and the end of the elastic baffle 106 to detach from the fixed plate 204. The bracket 2 moves under the elastic force of the spring 4, causing the needle of the syringe 3 to retract into the outer shell 1.

[0043] During the movement of the support 2, the limiting foot 201 of the support 2 always moves in a straight line against the through groove of the outer shell 1, making the movement of the support 2 stable and smooth. The limiting foot 201 of the support 2 eventually gets stuck in the fixing notch 103 and is fixed, making it difficult for the needle of the syringe 3 to extend out of the outer shell 1 again, reducing the probability of the needle pricking medical staff or patients.

[0044] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A safe injection device, comprising a housing (1), characterized in that, A bracket (2) is slidably installed inside the outer shell (1). A syringe (3) is clamped in the bracket (2). A spring (4) is provided in the non-flange end cavity of the outer shell (1) to always press against the bracket (2). The flange end of the bracket (2) is clamped by the elastic baffle (106) of the outer shell (1). The syringe (3) is equipped with a push rod (6) adapted to the elastic baffle (106). The bracket (2) is provided with a number of radially extending T-shaped limiting feet (201). The outer shell (1) is provided with a number of through slots adapted to the movement of the limiting feet (201). An extension plate (102) adapted to the linear movement of the limiting feet (201) extends in the through slots of the outer shell (1). The extension plate (102) is provided with a fixing notch (103) adapted to clamp the limiting feet (201) at the flange end of the outer shell (1).

2. The safe injection device according to claim 1, characterized in that, The limiting foot (201) is located at the non-flange end of the bracket (2), and the connection between the limiting foot (201) and the main body of the bracket (2) is narrowed.

3. The safe injection device according to claim 1, characterized in that, The outer casing (1) has a slot (101) at its non-flange end for a fitting notch (101) for a limiting foot (201) to be inserted into the slot. The outer casing (1) has elongated through holes (104) on both sides of the fixing notch (103).

4. A safe injection device according to claim 1, characterized in that, The flange end of the bracket (2) extends out of the fixing plate (204), and the end of the elastic baffle (106) is locked in the fixing plate (204). The end of the elastic baffle (106) is provided with an oblique angle adapted to the pressing deflection of the end of the push rod (6).

5. A safe injection device according to claim 4, characterized in that, The flange end of the bracket (2) extends into a safety frame (202), and the safety frame (202) is longer than the elastic baffle (106). The end of the safety frame (202) is C-shaped, and the opening of the C-shaped end faces the push rod (6). The two connection points between the end of the safety frame (202) and the rod body of the safety frame (202) are narrowed. The middle part of the C-shaped end of the safety frame (202) blocks the end deflection of the elastic baffle (106).

6. A safe injection device according to claim 5, characterized in that, The narrowed portion of the safety frame (202) is provided with a pivot (203), and an auxiliary frame (105) extends from the flange end of the outer shell (1), and the auxiliary frame (105) is provided with a notch adapted to the pivot (203).

7. A safe injection device according to claim 1, characterized in that, The bracket (2) extends out several elastic snap-fit ​​plates (205), and the elastic snap-fit ​​plates (205) have notches adapted to the flange of the syringe (3).

8. A safe injection device, comprising a housing (1), characterized in that, A bracket (2) is slidably installed inside the outer shell (1). A syringe (3) is clamped in the bracket (2). A spring (4) is provided in the non-flange end cavity of the outer shell (1) to always press against the bracket (2). The flange end of the bracket (2) is clamped by the elastic baffle (106) of the outer shell (1). A push rod (6) adapted to the elastic baffle (106) is installed in the syringe (3). A fixing plate (204) extends from the flange end of the bracket (2). The end of the elastic baffle (106) clamps the fixing plate (204). The end of the elastic baffle (106) is provided with an angle adapted to the pressing deflection of the end of the push rod (6).

9. A safe injection device according to claim 8, characterized in that, The flange end of the bracket (2) extends into a safety frame (202), and the safety frame (202) is longer than the elastic baffle (106). The end of the safety frame (202) is C-shaped, and the opening of the C-shaped end faces the push rod (6). The two connection points between the end of the safety frame (202) and the rod body of the safety frame (202) are narrowed. The middle part of the C-shaped end of the safety frame (202) blocks the end deflection of the elastic baffle (106).

10. A safe injection device according to claim 9, characterized in that, The narrowed portion of the safety frame (202) is provided with a pivot (203), and an auxiliary frame (105) extends from the flange end of the outer shell (1), and the auxiliary frame (105) is provided with a notch adapted to the pivot (203).

Images