CN217697521U

CN217697521U - Quantitative injector

Info

Publication number: CN217697521U
Application number: CN202220331419.5U
Authority: CN
Inventors: 贾玲玲; 李宇飞; 熊佳超; 姚佐超; 江华
Original assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Current assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-11-01
Anticipated expiration: 2032-02-18

Abstract

A quantitative injector relates to the technical field of medical instruments, and comprises an injection needle cylinder and an injection push rod, wherein an upper piston and a lower piston are respectively arranged in the injection needle cylinder, the two pistons are connected through an elastic buffer piece, the lower end of the injection push rod is fixedly connected with the upper piston, and a limit block protruding in the radial direction is fixed on the rod body of the injection push rod; the inner wall of the injection syringe is fixed with a left blocking piece and a right blocking piece which respectively protrude inwards, and the two blocking pieces are vertically distributed at intervals. The utility model provides an injector, which is particularly suitable for the preparation of the prefabricated storage medicine of a negative pressure ampulla bottle.

Description

Quantitative injector

Technical Field

The utility model relates to a medical apparatus technology, in particular to a quantitative injector technology.

Background

Botulinum toxin type A is pre-prepared and stored by a negative pressure ampule, and sterile normal saline is injected into the ampule by a syringe during preparation.

The existing syringe for preparing the botulinum toxin type A has the following defects: when injecting aseptic normal saline into the bottle, because the ann who stores the medicine cuts open the bottle in there is the negative pressure, the dose and the speed of aseptic normal saline that can't accurate control injected easily cause and inject the dose inaccuracy, and aseptic normal saline's the injection rate is too fast moreover leads to producing the bubble in the ann cuts open the bottle easily for medicine and aseptic normal saline produce the impact contact in the bottle, thereby produce the damage, thereby can influence the treatment effect of medicine.

SUMMERY OF THE UTILITY MODEL

To the defect that exists among the above-mentioned prior art, the utility model aims to solve the technical problem that a can accurate control pour into the aseptic normal saline dose of ann's dissection bottle into, can also avoid aseptic normal saline to pour into the too fast quantification syringe of speed into.

In order to solve the technical problem, the utility model provides a quantification injector, including injection cylinder, injection push rod, the lower extreme of injection cylinder is equipped with the needle head that is used for connecting the syringe needle, its characterized in that:

an upper piston and a lower piston are arranged in the injection needle cylinder respectively, an elastic buffer piece is arranged between the two pistons, the upper end of the buffer piece is fixedly connected with the upper piston, the lower end of the buffer piece is fixedly connected with the lower piston, the lower end of the injection push rod is fixedly connected with the upper piston, the upper end of the injection push rod extends upwards out of the injection needle cylinder, and a limit block protruding in the radial direction is fixed on the rod body of the injection push rod;

the inner wall of the injection needle cylinder is fixedly provided with a left blocking piece and a right blocking piece which respectively protrude inwards, and the two blocking pieces are vertically distributed at intervals;

when the injection push rod rotates to a limit block on the rod body and is aligned with the left barrier piece up and down, the limit block on the injection push rod and the right barrier piece are staggered up and down, and the left barrier piece can interfere with the upward movement of the limit block at the arrangement position of the barrier piece;

when the injection push rod rotates to the position that the limiting block on the rod body is aligned with the right barrier piece up and down, the limiting block on the injection push rod is staggered with the left barrier piece up and down, and the right barrier piece can interfere with the upward movement of the limiting block at the arrangement position of the barrier piece.

Further, the blocking piece is detachably fixed to the inner wall of the syringe cylinder.

The utility model provides a quantification syringe, the cooperation of stopper on the block piece through injection cylinder inner wall and the injection push rod, can accurate control inject into the aseptic normal saline dosage of ann's section bottle, through the buffering of the springy cushioning spare between two pistons, can also avoid aseptic normal saline injection rate too fast.

Drawings

Fig. 1 is a schematic structural diagram of a quantification syringe according to an embodiment of the present invention.

Detailed Description

The following description will be made in detail with reference to the accompanying drawings, but the present embodiment is not intended to limit the present invention, and all similar structures and similar variations thereof adopted by the present invention should be included in the protection scope of the present invention, and the relations between the numbers of the components in the present invention are shown.

As shown in fig. 1, the quantitative injector provided by the embodiment of the present invention comprises an injection cylinder 1 and an injection push rod 2, wherein the lower end of the injection cylinder 1 is provided with a needle joint 5 for connecting an injection needle;

an upper piston 31 and a lower piston 32 are arranged in the injection syringe 1, an elastic buffer member 4 is arranged between the two pistons, the upper end of the buffer member 4 is fixedly connected with the upper piston 31, the lower end of the buffer member 4 is fixedly connected with the lower piston 32, the lower end of the injection push rod 2 is fixedly connected with the upper piston 31, the upper end of the injection push rod 2 extends upwards out of the injection syringe, and a limit block 21 protruding in the radial direction is fixed on the rod body of the injection push rod 2;

the inner wall of the injection syringe 1 is fixedly provided with a left barrier sheet 11 and a right barrier sheet 12 which respectively protrude inwards, and the two barrier sheets are vertically distributed at intervals;

when the injection push rod 2 rotates to the position that the limiting block 21 on the rod body is aligned with the left barrier piece 12 up and down, the limiting block 21 on the injection push rod is staggered with the right barrier piece 11 up and down, and the left barrier piece 12 can interfere with the upward movement of the limiting block 21 at the arrangement position of the barrier pieces;

when the injection push rod 2 rotates until the limiting block 21 on the rod body is aligned with the right barrier piece 11 up and down, the limiting block 21 on the injection push rod and the left barrier piece 12 are staggered up and down, and the right barrier piece 11 can interfere with the upward movement of the limiting block 21 at the arrangement position of the barrier pieces.

In the embodiment of the utility model, the blocking

pieces

11 and 12 are detachably fixed on the inner wall of the injection needle cylinder 1 through the clamping groove structure, and the injection push rod and the piston can be firstly placed into the injection needle cylinder during assembly, and then the blocking pieces are clamped on the inner wall of the injection needle cylinder; in other embodiments of the present invention, the blocking piece can be detachably fixed on the inner wall of the syringe 1.

In the embodiment of the present invention, the arrangement positions of the two blocking pieces are determined according to the dose of the sterile saline required to be injected into the ampoule for storing the medicine (such as botulinum toxin type a), the dose of the sterile saline required to be injected into the ampoule for storing the medicine (such as botulinum toxin type a) generally has two doses of 2ml and 2.5ml, in this embodiment, the blocking piece 12 is arranged at the 2ml position, and the blocking piece 11 is arranged at the 2.5ml position, so that when the buffer 4 is in the natural extension state and the stopper 21 abuts against the blocking piece 12, the volume in the cavity of the injection syringe below the lower piston 32 is exactly 2ml, the buffer 4 is in the natural extension state and the stopper 21 abuts against the blocking piece 11, the volume in the cavity of the injection syringe below the lower piston 32 is exactly 2.5ml, thereby realizing accurate dose control.

The embodiment of the utility model provides a be fit for the preparation of the prefabricated medicine of storing of negative pressure ann's dissection bottle, its application method is as follows:

before use, an injection needle is arranged on a needle joint 5 at the lower end of an injection needle cylinder;

when the preparation of the medicine (such as botulinum toxin type A) is carried out, if 2ml of sterile physiological saline needs to be injected into an ampule, the injection push rod 2 is rotated until the limiting block 21 is vertically opposite to the left barrier sheet 12, the lower piston 32 is pushed downwards to the bottom, then the injection needle is inserted into a sterile physiological saline container, the injection push rod 2 is upwards drawn until the limiting block 21 is abutted to the barrier sheet 12 and the buffer piece 4 is in a natural extension state, and the sterile physiological saline extracted from the injection needle cylinder is exactly 2ml;

when the preparation of a medicament (such as botulinum toxin type A) is carried out, if 2.5ml of sterile physiological saline needs to be injected into an ampule, the injection push rod 2 is rotated until the limiting block 21 is vertically opposite to the right-side barrier sheet 11, the lower-side piston 32 is pushed downwards to the bottom, then the injection needle is inserted into a sterile physiological saline container, the injection push rod 2 is upwards pulled until the limiting block 21 is abutted against the barrier sheet 11 and the buffer piece 4 is in a natural extension state, and the sterile physiological saline extracted from the injection needle cylinder is exactly 2.5ml;

in the process of extracting the sterile normal saline, the lower piston 32 cannot rapidly rise due to the buffering effect of the buffering part 4, so that the sterile normal saline can be slowly extracted into the injection syringe, bubbles generated in the extraction link of the sterile normal saline are avoided, and the accurate extracted dosage is ensured;

after the sterile normal saline is extracted, the injection needle is inserted into the negative pressure ampule, the sterile normal saline in the injection needle cylinder is sucked into the ampule under the action of the negative pressure, and the speed of introducing the sterile normal saline into the ampule can be greatly reduced due to the buffering action of the buffer piece 4, so that the sterile normal saline is fully contacted with the medicine, and the phenomenon that the sterile normal saline is in impact contact with the medicine at the moment of entering the ampule is avoided.

Claims

1. The utility model provides a quantification syringe, includes syringe, injection push rod, and syringe's lower extreme is equipped with the needle head that is used for connecting the syringe needle, its characterized in that:

the inner wall of the injection needle cylinder is fixed with a left blocking piece and a right blocking piece which respectively protrude inwards, and the two blocking pieces are vertically distributed at intervals;

when the injection push rod rotates until the limiting block on the rod body is aligned with the left barrier piece up and down, the limiting block on the injection push rod is staggered with the right barrier piece up and down, and the left barrier piece can interfere with the upward movement of the limiting block at the arrangement position of the barrier piece;

2. The quantification syringe of claim 1, wherein: the barrier sheet is detachably fixed on the inner wall of the injection syringe.