CN217040960U - Pre-filled liquid medicine syringe - Google Patents

Abstract

The utility model provides a prefilled medicinal liquid syringe, which comprises a needle tube, a piston located in the needle tube and slidably connected with the inner wall of the needle tube, a push rod fixedly connected with the rear end of the needle tube and extending to the outside of the needle tube, and a space between the front part of the needle tube and the piston The liquid medicine is encapsulated; the inner wall of the needle tube is rotatably connected with a stop rod located on the rear side of the piston, and the stop rod is inclined from the back to the front in the needle tube from the inner wall of the needle tube to the push rod, and the end of the stop rod away from the inner wall of the needle tube can be Sliding on the outer wall of the push rod, the stop rod is elastically connected with the inner wall of the needle tube through an elastic piece, and the outer wall of the push rod is provided with a locking tooth which can be intermittently engaged with the stop rod. In the utility model, after the piston moves forward to completely push the medicinal liquid out of the needle tube, the backstop rod is in contact with the clamping teeth, and the backstop rod supports the push rod from the back to the front, so that the push rod cannot be pulled out backward, so that the Prevent criminals from reusing the syringe, avoid the risk of infection caused by reuse, and increase the patient's sense of security.

Description

Prefilled Liquid Syringe

technical field

The utility model belongs to the field of medical auxiliary instruments, in particular to a prefilled medicinal liquid syringe.

Background technique

The prefilled syringe is to put the liquid medicine directly into the prefilled needle tube, and the syringe and the medicine liquid packaging container are combined into one, and the medicine can be stored for a long time. Although the prefilled syringe is a disposable syringe, the existing prefilled syringe has no structural damage after one use, and no non-reusable device is provided. In fact, it can be recycled for repeated use, especially some illegal Molecules will recycle these syringes for secondary use in order to obtain illegal benefits. The recycled syringes can easily cause cross-infection of diseases and endanger people's health.

Utility model content

The purpose of the utility model is to solve the technical problems existing in the prior art, and the purpose of the utility model is to provide a prefilled medicinal liquid syringe.

In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a prefilled medicinal liquid syringe, comprising a needle tube, a piston located in the needle tube and slidably connected to the inner wall of the needle tube, and a push rod that is fixedly connected to the rear end of the needle tube and extends to the outside of the needle tube. The liquid medicine is encapsulated between the front part and the piston; the inner wall of the needle tube is rotatably connected with a backstop rod located on the rear side of the piston. The end of the inner wall of the needle tube can slide on the outer wall of the push rod, and the stop rod and the inner wall of the needle tube are elastically connected by elastic parts; the outer wall of the push rod has a tooth, after the piston moves forward to completely push the liquid medicine out of the needle tube, the backstop is prevented. The rod can be clamped and fixed with the clamping teeth, and the backstop rod is still inclined from the back to the front in the needle tube from the inner wall of the needle tube to the push rod.

In the above technical solution, after the piston moves forward to completely push the medicinal liquid out of the needle tube, the backstop rod is in contact with the clamping teeth, and the backstop rod supports the push rod from the back to the front, so that the push rod cannot be pulled back, so as to prevent the push rod from being pulled out. This prevents criminals from reusing the syringe and avoids the risk of infection from reuse. The syringe of the utility model can only be used once, and is a disposable product, which can be directly injected and used, thereby reducing the pollution risk and increasing the patient's sense of security.

In a preferred embodiment of the present invention, the end of the backstop rod away from the inner wall of the needle tube has a circular arc head that can be in contact with the outer wall of the push rod.

In the above technical solution, the setting of the arc head can reduce the frictional resistance, which is beneficial to the sliding of the stop rod on the push rod.

In a preferred embodiment of the present invention, the outer wall surface of the front part of the push rod is a cylindrical surface or a conical surface, and the large end of the conical surface is close to the piston. Compared with the cylindrical surface, the tapered conical surface facilitates the sliding of the backstop rod on the outer wall surface of the push rod, and facilitates the slideback of the backstop rod over the clamping teeth and counteracts the clamping teeth.

In a preferred embodiment of the present invention, the clamping teeth are arranged on a cylindrical surface or a conical surface.

In a preferred embodiment of the present invention, a triangular area is formed between the conical surface of the push rod, the stop rod and the inner wall of the needle tube, and the angle between the conical surface and the stop rod is always greater than 90°. The triangle has good stability and good self-locking effect.

In another preferred embodiment of the present invention, the included angle between the conical surface and the backstop rod is between 120° and 170°.

In another preferred embodiment of the present invention, when the prefilled medical liquid syringe is not in use, there is a certain distance between the front end of the stop rod away from the inner wall of the needle tube and the piston.

In the above technical solution, when blood needs to be drawn back, the push rod can be pulled backward first to make the piston move backward to draw back blood, and then the push rod can be pushed forward to inject medicinal liquid after blood is drawn back, so that the syringe can also be applied to the syringe that needs to be pumped first. In the case of returning blood, the scope of application of the syringe is improved.

In another preferred embodiment of the present utility model, the locking teeth are triangular locking teeth, and the triangular locking teeth have a sliding surface and an abutting surface arranged next to each other. When the piston moves forward, the backstop rod can slip on the sliding surface and can contact with the opposing surface.

In another preferred embodiment of the present invention, the number of the latching teeth is multiple, a tooth slot is formed between the latching tooth and the latching tooth, and the front end of the backstop rod can be clamped into the tooth slot.

In the above technical solution, by setting a plurality of clamping teeth, the machining accuracy of the position of the clamping teeth can be reduced, and when the injection is completed and the piston is pressed against the front end of the needle tube, it is ensured that the stop rod can be clamped with one of the plurality of clamping teeth. connected to achieve self-locking.

In another preferred embodiment of the present invention, the front end of the needle tube has a needle nipple, and the needle nipple is screwed with a cap plug that closes the outlet thereof.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a prefilled medical liquid syringe according to Embodiment 1 of the present application.

Fig. 2 is a view showing a state in which the medicinal solution shown in Fig. 1 is completely pushed out of the needle tube when the syringe is used.

FIG. 3 is a partial enlarged view of FIG. 2 .

FIG. 4 is a schematic structural diagram of a prefilled medical liquid syringe according to the second embodiment of the present application.

Fig. 5 is a view showing a state in which the medicinal solution shown in Fig. 4 is completely pushed out of the needle tube when the syringe is used.

The reference signs in the accompanying drawings include: needle tube 1, piston 2, push rod 3, conical surface 31, needle nipple 4, cap plug 5, medicinal liquid 6, stop rod 7, arc head 71, elastic member 8, The angle θ between the locking teeth 9, the slipping surface 91, the abutting surface 92, the tooth slot 10, the conical surface and the anti-return rod.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "vertical", "upper", "lower", "front", "rear", "left" and "right" , "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing this The utility model and simplified description, rather than indicating or implying that the indicated device or element must have a particular orientation, be constructed and operate in a particular orientation, should not be construed as a limitation of the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a mechanical connection or an electrical connection, or it may be a The internal communication between the two elements may be directly connected or indirectly connected through an intermediate medium, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific circumstances.

Example 1

This embodiment provides a pre-filled medicinal liquid syringe, as shown in FIGS. 1-3 , in a preferred embodiment of the present invention, it includes a needle tube 1 , which is located in the needle tube 1 and is slidably connected to the inner wall of the needle tube 1 The piston 2 , the push rod 3 that is fixedly connected to the rear end of the needle tube 1 and extends to the outside of the needle tube 1 , and a medicinal liquid 6 is encapsulated between the front part of the needle tube 1 and the piston 2 . The front end of the needle tube 1 has a needle nipple 4, which is an interface for connecting with a needle or an intravenous infusion device. The needle nipple 4 is a conventional needle nipple in the market. The cap plug 5 and the needle nipple 4 are hermetically connected by a sealing ring, or the two are connected by means of interference fit, which are in the prior art and will not be described in detail here.

The inner wall of the needle tube 1 is rotatably connected to a backstop rod 7 located on the rear side of the piston 2 through a rotating shaft. The end of the stop rod 7 away from the inner wall of the needle tube 1 (the front end of the stop rod 7 ) can slide on the outer wall of the push rod 3 . In this embodiment, the segment where the stop rod 7 slides on the outer wall of the push rod 3 is: cylindrical surface. Preferably, as shown in FIG. 3 , the end of the stop rod 7 away from the inner wall of the needle tube 1 has a circular arc head 71 that can contact the outer wall of the push rod 3 . The stop rod 7 and the inner wall of the needle tube 1 are elastically connected by an elastic member 8, preferably the elastic member 8 is a compression spring.

The outer wall of the push rod 3 is provided with a tooth 9. After the piston 2 moves forward to completely push the liquid medicine 6 out of the needle tube 1, the backstop rod 7 can be clamped and fixed with the tooth 9, and the backstop rod 7 remains in the needle tube 1. The inner wall of the needle tube 1 is inclined to the push rod 3 from the back to the front.

With such a technical solution, initially, the medicinal liquid 6 is filled in the needle tube 1 , and under the action of the elastic member 8 , the front end of the stop rod 7 is in contact with the inner wall of the push rod 3 . When the syringe needs to be used, remove the cap plug 5, then connect the needle nipple 4 to the needle or intravenous infusion device, and then inject the drug 6 into the patient. During the injection, the medical staff pushes the push rod 3 forward, and the push rod 3 makes the The piston 2 moves forward, and the piston 2 pushes the medicinal liquid 6 out of the needle nipple 4 . During the process of pushing the push rod 3 to move the piston 2 forward, under the action of the elastic member 8 , the front end of the stop rod 7 slips on the outer wall of the push rod 3 and moves backward relative to the push rod 3 . After the piston 2 moves forward and pushes the medicinal liquid 6 out of the needle tube 1 completely, the backstop rod 7 abuts against the locking teeth 9, and the backstop rod 7 supports the push rod 3 from the rear to the front, so that the push rod 3 cannot be pulled back. This can prevent criminals from reusing the syringe and avoid the risk of infection caused by reuse.

After the syringe of the present invention injects medicinal liquid, the front end of the piston 2 collides with the front end of the needle tube 1, and the stop rod 7 cannot be rotated backwards, nor can it rotate forwards around the teeth 9, forming a self-locking structure.

As shown in FIG. 1 , in another preferred embodiment, when the prefilled syringe is not in use, there is a certain distance between the front end of the stop rod 7 away from the inner wall of the needle tube 1 and the piston 2 . Therefore, when blood needs to be withdrawn, the push rod 3 can be pulled backward first to make the piston 2 move backward to withdraw blood. Preferably, when the blood is withdrawn, the front end of the stop rod 7 abuts against the rear end of the piston 2, so that the piston 2 can be prevented from being separated from the needle tube 1 during the backward movement. After the blood is drawn back, the push rod 3 is pushed forward to inject the medicinal solution 6 .

As shown in FIG. 3 , in another preferred embodiment, the number of the latching teeth 9 is multiple, a tooth slot 10 is formed between the latching tooth 9 and the latching tooth 9 , and the front end of the stop rod 7 can be inserted into the tooth slot 10 middle. Further preferably, latching teeth 9 are provided on both sides of the push rod 3 , the number of the backstop rods 6 is also two, and the two backstop rods 6 are arranged symmetrically with the axis of the needle tube 1 .

In another preferred embodiment, the locking tooth 9 is a triangular locking tooth, and the triangular locking tooth has a sliding surface 91 and an abutting surface 92 arranged next to each other. Preferably, the locking tooth 9 is a right-angled triangle locking tooth, and the sliding surface 91 is inclined backward. The inclined plane, the abutting plane 92 is a vertical plane perpendicular to the push rod 3 . When the piston 2 moves forward, the stop rod 7 slips on the sliding surface 91 and moves backward relative to the push rod 3 . Of course, the latching teeth 9 can also be trapezoidal teeth having a slipping surface and an abutting surface, or the like.

Embodiment 2

The structure and principle of this embodiment are basically the same as those of the first embodiment, except that, as shown in FIGS. 4 and 5 , the outer wall surface of the front part of the push rod 3 is a conical surface 31 , and the larger end close to piston 2. Preferably, the clamping teeth 9 are arranged at the tail of the conical surface 31 , and the abutting surfaces of the clamping teeth 9 are arranged perpendicular to the conical surface 31 . Compared with the cylindrical surface, the tapered conical surface 31 facilitates the sliding of the backstop rod 7 on the outer wall surface of the push rod 3 and facilitates the slideback of the backstop rod 7 over the locking teeth 9 .

In another preferred embodiment, a triangle area is formed between the conical surface 31 of the push rod 3, the stop rod 7 and the inner wall of the needle tube 1, and the triangle has good stability. The included angle θ between the conical surface and the stop rod is always greater than 90°, and preferably the included angle θ between the conical surface and the stop rod is between 120° and 170°.

In the description of this specification, reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" or the like is meant to be combined with the description of the embodiment A particular feature, structure, material, or characteristic described or exemplified is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the present invention. Variations, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

1. The prefilled liquid medicine injector comprises a needle tube, a piston and a push rod, wherein the piston is positioned in the needle tube and is in sliding connection with the inner wall of the needle tube, the push rod is fixedly connected with the rear end of the needle tube and extends out of the needle tube, and liquid medicine is packaged between the front part of the needle tube and the piston; the anti-falling device is characterized in that a stopping rod positioned at the rear side of the piston is rotatably connected to the inner wall of the needle tube, the stopping rod is obliquely arranged from the inner wall of the needle tube to the push rod from back to front in the needle tube, the end part, far away from the inner wall of the needle tube, of the stopping rod can slide on the outer wall of the push rod, and the stopping rod is elastically connected with the inner wall of the needle tube through an elastic piece;

the outer wall of the push rod is provided with clamping teeth, after the piston moves forwards to completely push the liquid medicine out of the needle tube, the stopping rod can be fixedly connected with the clamping teeth in a clamped mode, and the stopping rod is still obliquely arranged from back to front in the needle tube from the inner wall of the needle tube to the push rod.

2. A pre-filled medical liquid syringe as defined in claim 1 wherein the end of said retaining rod remote from the inner wall of the needle tube has a rounded head adapted to contact the outer wall of said plunger.

3. The pre-filled medical liquid syringe as claimed in claim 1, wherein the outer wall surface of the front portion of the push rod is a cylindrical surface or a conical surface, and the larger end of the conical surface is close to the piston.

4. A pre-filled medical liquid syringe as set forth in claim 3, wherein said latch is provided on said cylindrical or conical surface.

5. A pre-filled medical liquid syringe as claimed in claim 3, wherein a triangular area is formed between the conical surface of the push rod, the retaining rod and the inner wall of the needle tube, and an angle between the conical surface and the retaining rod is always larger than 90 °.

6. A pre-filled medical liquid syringe as claimed in claim 4, wherein the angle between said conical surface and said backstop rod is between 120 ° and 170 °.

7. A pre-filled medical liquid injection syringe according to any one of claims 1 to 6, wherein the front end of said check rod away from the inner wall of the syringe tube is spaced from the piston when said pre-filled medical liquid injection syringe is not in use.

8. The pre-filled medical liquid syringe according to any one of claims 1 to 6, wherein the latch is a triangular latch having a slipping surface and an abutting surface disposed in close proximity, and the retaining rod is able to slip on the slipping surface and abut against the abutting surface when the piston moves forward.

9. The pre-filled liquid medicine syringe according to any one of claims 1 to 6, wherein the number of the latch is plural, a spline is formed between the latch and the latch, and a front end of the retaining rod can be snapped into the spline.

10. A pre-filled medical liquid injection device according to any one of claims 1 to 6 wherein said needle tube has a needle nipple at its forward end, said needle nipple being screw-connected with a cap stopper closing its outlet.

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