CN212880345U - Backflow prevention syringe - Google Patents

Abstract

The utility model discloses a backflow prevention injector, which comprises a needle cylinder and a push rod, wherein the front end of the needle cylinder is provided with an injection port, the inner wall of the needle cylinder is provided with a plurality of elastic limiting blocks, and the limiting blocks are distributed at intervals along the axial direction of the needle cylinder; the push rod is inserted into the back end of the syringe, and the front end of the push rod is provided with an elastic piston which is in interference fit with the syringe. The utility model discloses an inner wall at the cylinder sets up a plurality of stoppers, and when the springy piston on push rod top was by the pulling drawing liquid backward, thereby the springy piston can be crossed the stopper in the deformation of power down, nevertheless because blockking of stopper, the springy piston is difficult to move back easily, has avoided hydrops that takes out in the cylinder to flow back to the affected part, has prevented the infection effectively. The utility model discloses simple structure, easily operation.

Description

Backflow prevention syringe

Technical Field

The utility model relates to a backflow prevention injector in the technical field of medical instruments.

Background

Pleural effusion is a common clinical condition characterized by pathological fluid accumulation within the pleural cavity. The pleural cavity is a potential clearance between visceral layer and parietal pleura, has 5 ~ 15ml liquid in the normal people pleural cavity, plays lubricated effect when respiratory motion, has 500 ~ 1000 ml's liquid to form and absorb in the pleural cavity every day, and any reason leads to the production of pleural cavity intracavity liquid to increase or absorb and reduce, can produce pleural effusion. It can be classified into leaking pleural effusion and exudative pleural effusion according to the mechanism of occurrence. The pleural effusion drainage tube can be inserted to the patient who clinically is too much pleural effusion, the pleural effusion is taken out of the human body through the syringe or the drainage bag, but the effusion is taken out of the human body because of the negative pressure in the human body, if the syringe piston is loosened to return easily due to the negative pressure when a certain amount of effusion is taken out, the taken effusion is sent back to the human body, and clinically, the drainage liquid of the taken out human body flows back to cause infection easily.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a prevent syringe that flows backwards, the liquid refluence in the cylinder when it can avoid drawing liquid.

According to a first aspect of the present invention, there is provided a backflow prevention injector, which includes a needle cylinder, an injection port is disposed at a front end of the needle cylinder, a plurality of elastic stoppers are disposed on an inner wall of the needle cylinder, and the stoppers are spaced apart from each other along an axial direction of the needle cylinder; the push rod is inserted into the rear end of the needle cylinder, and the front end of the push rod is provided with an elastic piston which is in interference fit with the needle cylinder.

According to the utility model discloses first aspect embodiment, furtherly, the stopper is the taper, the side of stopper and the interior wall connection of cylinder, the pointed end of stopper is towards the front end of cylinder.

According to the utility model discloses first aspect embodiment, furtherly, the bottom surface perpendicular to the inner wall of cylinder of stopper.

According to the utility model discloses first aspect embodiment, further, the top of push rod is connected with the center of elastic piston, the thickness of elastic piston reduces from the center to the edge.

According to the utility model discloses first aspect embodiment, further, the outside of cylinder rear end is equipped with the cylinder handle.

According to the utility model discloses first aspect embodiment, furtherly, the bottom of push rod is equipped with the push rod handle.

According to the utility model discloses first aspect embodiment, furtherly, stopper and elastic piston are rubber component.

The utility model has the advantages that: the utility model discloses an inner wall at the cylinder sets up a plurality of stoppers, and when the springy piston on push rod top was by the pulling drawing liquid backward, thereby the springy piston can be crossed the stopper in the deformation of power down, nevertheless because blockking of stopper, the springy piston is difficult to move back easily, has avoided hydrops that takes out in the cylinder to flow back to the affected part, has prevented the infection effectively. The utility model discloses simple structure, easily operation.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic diagram of the present invention.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, a backflow preventing syringe according to an embodiment of the present invention includes a cylinder 10 and a push rod 30.

The front end of the syringe 10 is provided with an injection port, the inner wall of the syringe 10 is provided with a plurality of elastic limiting blocks 20, and the limiting blocks 20 are distributed at intervals along the axial direction of the syringe 10. Preferably, the limiting block 20 is tapered, the side surface of the limiting block 20 is connected with the inner wall of the syringe 10, and the tip of the limiting block 20 faces the front end of the syringe 10. The bottom surface of the stopper 20 is perpendicular to the inner wall of the syringe 10.

The push rod 30 is inserted into the rear end of the cylinder 10, and the front end of the push rod 30 is provided with an elastic piston 40, and the elastic piston 40 is in interference fit with the cylinder 10. Optionally, a syringe handle 11 is provided at the outside of the rear end of the syringe 10, and a push rod handle 31 is provided at the bottom end of the push rod 30 to facilitate the movement of the push rod 30 in the syringe 10 by a user pushing or pulling. In the present embodiment, the stopper 20 and the elastic piston 40 are both rubber members. The elastic piston 40 of the push rod 30 is pushed to the foremost end, then the front end of the injection port is inserted into the affected part, and the push rod 30 is pulled, so that the elastic piston 40 moves from front to back in the cylinder 10. Because the limiting block 20 is conical and the elastic piston 40 and the limiting block 20 have elasticity, the elastic piston 40 can move backwards along the inclined side surface of the limiting block 20; when the elastic piston 40 passes over one limiting block 20, the elastic piston 40 abuts against the bottom surface of the limiting block 20, so that the forward movement of the elastic piston 40 is limited, and the backflow of the effusion pumped out of the needle cylinder 10 is avoided. Further, the top end of the push rod 30 is connected with the center of the elastic piston 40, the thickness of the elastic piston 40 is reduced from the center to the edge, and the edge of the elastic piston 40 is more easily deformed so that the elastic piston 40 passes over the limiting block 20.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims (7)

1. A backflow prevention syringe, comprising:

the injection device comprises a needle cylinder (10), wherein an injection port is formed in the front end of the needle cylinder (10), a plurality of elastic limiting blocks (20) are arranged on the inner wall of the needle cylinder (10), and the limiting blocks (20) are distributed at intervals along the axial direction of the needle cylinder (10);

the push rod (30), the rear end of push rod (30) insertion syringe (10), the front end of push rod (30) is equipped with elastic piston (40), elastic piston (40) and syringe (10) interference fit.

2. The anti-reflux syringe of claim 1, wherein: stopper (20) are the taper shape, the side of stopper (20) and the interior wall connection of cylinder (10), the tip of stopper (20) is towards the front end of cylinder (10).

3. The anti-reflux syringe of claim 2, wherein: the bottom surface of the limiting block (20) is vertical to the inner wall of the needle cylinder (10).

4. The anti-reflux syringe of claim 1, wherein: the top end of the push rod (30) is connected with the center of the elastic piston (40), and the thickness of the elastic piston (40) is reduced from the center to the edge.

5. The anti-reflux syringe of claim 1, wherein: a syringe handle (11) is arranged on the outer side of the rear end of the syringe (10).

6. The anti-reflux syringe of claim 1, wherein: the bottom end of the push rod (30) is provided with a push rod handle (31).

7. The anti-reflux syringe of claim 1, wherein: the limiting block (20) and the elastic piston (40) are both rubber components.

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