CN106310461B

CN106310461B - Syringe aid

Info

Publication number: CN106310461B
Application number: CN201510333161.7A
Authority: CN
Inventors: 柯潇; 蔡忠伟
Original assignee: Chengdu Kanghong Biotechnologies Co Ltd
Current assignee: Chengdu Kanghong Biotechnologies Co Ltd
Priority date: 2015-06-16
Filing date: 2015-06-16
Publication date: 2023-09-08
Anticipated expiration: 2035-06-16
Also published as: CN106310461A

Abstract

The invention provides an auxiliary device of an injector, which comprises an booster, wherein the booster consists of an injector fixing groove positioned in the center, side wings symmetrically arranged on two sides of the fixing groove and a hollow cylinder connected with the fixing groove and extending away from the outlet end of the injector; the auxiliary device can further comprise a dose clip matched with the booster, wherein the dose clip comprises an arc-shaped clamping part, a dose boss arranged at the upper end of the clamping part and a tail fin used for controlling the opening and closing of the clamping part of the dose clip, and the dose clip can be matched and clamped on a hollow cylinder of the booster; for the prefilled syringe, a barb ring can be further arranged on the hollow cylinder of the booster and matched with an elastic latch arranged on the piston rod core of the syringe, so that the piston rod core is prevented from moving backwards during vacuum sterilization. The auxiliary device of the injector has the advantages of simple structure, convenient use, accurate control of injection dosage and the like.

Description

Syringe aid

Technical Field

The invention relates to an auxiliary device of an injector, and belongs to the field of medical appliances.

Background

Conventional injectors typically consist of a barrel with a small bore at the front end and a matching plunger rod core, with the barrel tail typically provided with a flange for the user to grasp. Because the injector is generally smaller in volume, the flange part at the tail part of the needle cylinder is difficult to grasp by hands in actual operation, thereby bringing difficulty to clinical application, greatly increasing the labor intensity of medical staff and reducing the injection accuracy. In order to provide accurate injection doses, existing injectors typically set a dose indicator line on the syringe, and medical personnel provide the patient with the required injection dose by aligning a specific portion of the plunger rod core with a pre-set dose indicator line on the syringe during use. However, such operation modes are often not well implemented in practical applications, such as: medical staff can not accurately correspond the piston rod core to the dosage mark set on the needle cylinder due to visual errors such as looking up or overlooking, and the like, so that the requirement of accurate drug administration can not be met. In particular, for small volume syringes, such as ophthalmic syringes, in which about 100 μl or less of fluid is to be injected, the slight error in calibration of the particular location of the plunger rod core with the dosage indicia on the syringe is highly likely to result in large changes in the injected dosage, which has long presented a potential risk to the clinic.

In addition, the piston rod core in the traditional injector can move back and forth in the needle cylinder, and medical staff can draw medicine from a penicillin bottle or an ampoule by pulling the piston rod core when using the syringe, and then empty and administer the medicine by pushing the piston rod core. However, for prefilled syringes, the drug is usually prefilled into the syringe barrel, and then subjected to operations such as plugging, light inspection, sterilization, etc., and the medical staff only needs to empty and administer the drug when using the syringe; at this time, if medical staff pulls the piston rod core due to misoperation, unclean air can be sucked into the needle cylinder, and pollution is caused to the sterile preparation; in addition, in the vacuum sterilization process of the prefilled syringe, the liquid in the syringe is expanded due to negative pressure, and the piston rod core can be unexpectedly moved, so that adverse effects are brought to the prefilled medicine in the syringe.

Disclosure of Invention

The invention aims to provide the auxiliary device for the injector, which is convenient for medical staff to use, can accurately control the injection dosage and can effectively prevent the piston rod core of the injector from moving backwards, so as to overcome the defects in the prior art.

The purpose of the invention is realized in the following way:

the auxiliary device for the injector comprises an booster 1, wherein the booster 1 consists of an injector fixing groove 2 positioned in the center, side wings 3 symmetrically arranged at two sides of the fixing groove 2, and a hollow cylinder 4 connected with the fixing groove 2 and extending away from an outlet end 15 of the injector; the injector fixing groove 2 is provided with an opening at one side and can be parallelly clamped on a flange 14 at the tail part of the injector needle cylinder 13 from the side; the inner diameter of the hollow cylinder 4 is matched with the outer diameter of the syringe piston rod core 10, so that the piston rod core 10 can move in parallel in the hollow cylinder 4;

further, the auxiliary device of the injector also comprises a dosage clip 6 matched with the booster 1, wherein the dosage clip 6 comprises an arc-shaped clamping part 7, a dosage boss 8 arranged at the upper end of the clamping part 7 and a tail wing 9 for controlling the opening and closing of the clamping part 7; wherein, the clamping part 7 is provided with an opening at one side and can be parallelly clamped on the hollow cylinder 4 of the booster 1 from the side; the outer diameter of the hollow cylinder 4 is matched with the inner diameter of the dosage clip clamping part 7, and when the dosage clip 6 is clamped on the outer side of the hollow cylinder 4, a dosage boss 8 at the upper end of the clamping part 7 is closely jointed with the tail end edge of the hollow cylinder 4;

wherein the projection height of the dose boss 8 is the distance that the medical staff pushes the piston rod core 10 to move towards the outlet end 15 of the injector in order to provide the required injection dose; the height of the projection of the dosage boss 8 can be adjusted according to the size of the injector and the required dosage to meet different dosage requirements;

preferably, the syringe is a prefilled syringe or a common syringe;

when a prefilled syringe is selected, the inner wall of the hollow cylinder 4 of the booster 1 is further provided with a barb ring 5, and the barb ring 5 is matched with an elastic latch 11 arranged on the syringe piston rod core 10, so that the piston rod core 10 can only move in the direction towards the outlet end 15 of the syringe, but not move in the direction away from the outlet end 15 in the hollow cylinder 4.

Compared with the prior art, the auxiliary device of the injector has the following advantages:

1. the contact part of the user on the booster provides a comfortable force application point for medical staff, is convenient for pressing operation, reduces labor intensity and improves injection efficiency;

2. the accurate injection dosage can be provided, manual calibration by medical staff is not needed, and dosage deviation caused by visual errors is avoided;

3. the backward movement of the piston rod core of the injector caused by vacuum sterilization or manual operation errors is effectively prevented, and the possibility of liquid medicine pollution is reduced;

4. simple structure and low cost, and is suitable for industrial application.

Drawings

Fig. 1 is a schematic perspective view of a booster

FIG. 2 is a front view of the booster

FIG. 3 is a cross-sectional view of the booster of FIG. 2 taken along line A-A

Figure 4 is an enlarged view of a portion of the barb ring of figure 3

Fig. 5 is a schematic view of a dose clip in a three-dimensional structure

FIG. 6 is a top view of the dose clip

FIG. 7 shows a piston rod core

FIG. 8 is an enlarged view of a portion of the latch of FIG. 7

FIG. 9 is a schematic diagram of the matching structure of the booster, the dose clip and the injector

FIG. 10 is a diagram showing the structure of the device for preventing the piston rod core from retreating in the comparative experiment

FIG. 11 is a schematic view of the plunger rod core of the syringe of FIG. 10

Detailed Description

Specific embodiments of the present invention are illustrated below with reference to the accompanying drawings.

Fig. 1 and 2 show a booster 1 according to the present invention, which comprises a syringe fixing groove 2 at a central position, side wings 3 symmetrically disposed at both sides of the fixing groove 2, and a hollow cylinder 4 connected with the fixing groove 2 and extending away from an outlet end 15 of the syringe; the injector fixing groove 2 is provided with an opening at one side, and can be parallelly clamped on a flange 14 at the tail of the injector needle cylinder 13 from the side, so that the booster 1 is stably loaded on the injector and cannot shake due to external force. The medical staff can conveniently grasp the side wings 3 on two sides of the booster 1 when performing injection operation, and wing-shaped, arc-shaped and other wing structures with proper shapes provide comfortable acting points for fingers of the medical staff, so that the medical staff can operate more simply and labor-saving, and the injection efficiency is effectively improved.

The syringe accessory device according to the invention may further comprise a dose clip 6 matching with the booster 1, fig. 5-6 showing the construction of the dose clip 6; the dose clip 6 comprises an arc-shaped clamping part 7, a dose boss 8 arranged at the upper end of the clamping part 7, and a tail wing 9 for controlling the opening and closing of the clamping part 7; the dose clip 6 can be parallelly clamped on the hollow cylinder 4 of the booster 1 through an opening at one side of the clamping part 7, and a dose boss 8 at the upper end of the clamping part 7 is closely jointed with the tail end edge of the hollow cylinder 4. The protruding height of the dosage boss 8 is the distance that a medical staff pushes the syringe piston rod core 10 to move towards the syringe outlet end 15 in order to provide the required injection dosage, and the distance can be adjusted according to the size of the syringe and the required injection dosage so as to meet the requirements of different administration dosages.

Fig. 9 shows a longitudinal sectional configuration of the booster 1, the dose clip 6 and the syringe after deployment. Before the injection action is completed, medical staff wraps the dosage clip 6 on the hollow cylinder 4 of the booster 1, then performs the steps of liquid taking, emptying and the like, pushes the user contact part 12 on the syringe piston rod core 10 to the position of the dosage boss 8 after the emptying step is completed, then presses the two tail fins 9 of the dosage clip 6 respectively by the thumb and the forefinger, takes the dosage clip 6 off the hollow cylinder 4 in parallel, and then pushes the user contact part 12 at the tail part of the syringe piston rod core 10 to the tail end edge position of the hollow cylinder 4, thus completing the injection. In actual use, a plurality of strip-shaped protrusions can be respectively arranged on the two tail fins 9 of the dose clip 6 according to requirements so as to increase friction between the tail fins 9 and fingers, and thus the anti-skid effect is achieved. The syringe auxiliary device of the present invention can provide accurate injection dosage by strictly controlling the protrusion height of the dosage boss 8.

The applicant found through experiments that in the existing syringes for dosing through a dose indicator line, most of the syringes are designed to push the plunger rod core to the dose indicator line to complete the emptying, and then push the plunger rod core until the plunger rod core cannot move to complete the dosing injection, and the actual injection dose is from the dose indicator line to the outlet end of the syringe. However, since the syringe outlet end is typically provided with a needle mating section 16 of reduced inside diameter, the plunger rod core 10 is not accessible and a fluid residue of indefinite volume is produced, resulting in an unpredictable error in the injected dose. For example: taking 2 syringes with the inner diameter of 6.35mm, wherein one syringe is quantified by a dose marking line, the other syringe is quantified by the auxiliary device of the syringe, the preset dosing dose is 50 mu L,2 syringes simulate injection for 10 times respectively, each injected liquid is weighed by an electronic balance of one ten thousandth respectively, the volume is calculated according to the specific gravity of the liquid, the result shows that the 10 syringes with the dose marking line have the injection dose range of 36.0-74.8 mu L, the average error rate is 24.92%, and the 10 syringes with the syringe of the invention have the injection dose range of 50.2-51.2 mu L, and the average error rate is only 1.22%. Compared with the traditional injector which carries out quantitative through the dose marking line, the auxiliary device of the injector can greatly improve the accuracy of injection dose, not only avoids dose deviation caused by visual errors of medical staff, but also lightens the burden of manual dose calibration of the medical staff and provides better selection for clinical application.

The syringe auxiliary device can be applied to a common syringe or a prefilled syringe. When the injector is used for prefilled injection, a plurality of barb rings 5 can be further arranged in the hollow cylinder 4 of the booster 1, and meanwhile, elastic clamping teeth 11 which can be matched with the barb rings 5 are arranged on the piston rod core 10 of the injector. Fig. 3-4 and 7-8 show the structures of the barb ring 5 and the elastic latch 11 respectively, in the practical application process, generally, the medicine is filled and sealed into the syringe cylinder, then the booster 1 and the piston rod core 10 are loaded onto the syringe cylinder 13, the clamping part 7 of the dose clip 6 is clamped with the hollow cylinder 4, the piston rod core 10 is pushed to enable the latch 11 and the barb ring 5 in the hollow cylinder 4 to form a tooth-shaped engagement structure shown in fig. 9, and a section of emptying distance L is reserved between the user contact part 12 at the tail end of the piston rod core 10 and the dose boss 8, so that a medical staff can perform emptying operation in use. The toothed engagement structure described above allows the syringe plunger rod core 10 to move within the barrel 13 only in a direction towards the outlet end 15 of the syringe and not in a direction away from the outlet end 15.

The applicant has examined the anti-backward function of the auxiliary device of the syringe shown in fig. 10 at the same time, the basic principle is that the protruding part 17 shown in fig. 11 is arranged on the syringe piston rod core, the protruding part 17 can be disc-shaped or ring-shaped, and meanwhile, the stop block 18 capable of blocking the protruding part 17 is arranged on the booster, so that the protruding part 17 can not pass the stop block 18 in the backward movement process of the piston rod core to play a role in preventing the backward movement of the piston rod core; however, the applicant found in experiments that, because the contact area between the protruding portion 17 and the stopper 18 in the device is limited, the interaction force between the protruding portion 17 and the stopper 18 is weak, and when the external force is excessively applied, the protruding portion 17 still passes over the stopper 18 and is separated from the syringe, so that the truly anti-backward function cannot be realized. The barb ring 5 and the latch 11 form a close occlusion structure, the barb ring and the latch are tightly and firmly matched and are not easy to separate under the action of external force, and the piston rod core can be ensured not to move backwards due to the expansion of the volume of liquid in the needle cylinder in the vacuum sterilization process, so that the possibility of medicament pollution is avoided; meanwhile, when the medical care personnel use, the medical liquid can be prevented from being polluted by sucking unclean air into the needle cylinder due to misoperation, and better guarantee is provided for clinic.

Claims

1. The auxiliary device for the injector comprises an auxiliary device (1), wherein the auxiliary device (1) consists of an injector fixing groove (2) positioned in the center, side wings (3) symmetrically arranged on two sides of the fixing groove (2) and a hollow cylinder (4) connected with the fixing groove (2) and extending away from an outlet end (15) of the injector;

the injector is a prefilled syringe, and is characterized in that a barb ring (5) is arranged on the inner wall of a hollow cylinder (4) of the booster (1), and the barb ring (5) is matched with an elastic latch (11) arranged on a piston rod core (10) of the injector, so that the piston rod core (10) can only move in the direction towards an outlet end (15) of the injector in the hollow cylinder (4) but cannot move in the direction away from the outlet end (15).

2. Injector aid according to claim 1, characterized in that the injector fixing groove (2) is provided with an opening on one side, which can be clamped laterally in parallel on a flange (14) at the rear of the injector cylinder (13).

3. Syringe accessory device according to claim 1, characterized in that the inner diameter of the hollow cylinder (4) is matched to the outer diameter of the syringe piston rod core (10) so that the piston rod core (10) can move in parallel within the hollow cylinder (4).

4. A syringe accessory device according to any of claims 1-3, characterized by comprising a dose catch (6) matching the booster (1).

5. The syringe auxiliary device according to claim 4, wherein the dose clip (6) comprises an arc-shaped clamping portion (7), a dose boss (8) arranged at the upper end of the clamping portion (7), and a tail fin (9) for controlling the opening and closing of the clamping portion (7).

6. Syringe accessory device according to claim 5, characterized in that the clamping part (7) is provided with a side opening, which can be clamped sideways in parallel on the hollow cylinder (4) of the booster (1).

7. Syringe accessory device according to claim 5, characterized in that the outer diameter of the hollow cylinder (4) matches the inner diameter of the dose clip holding location (7), and that the dose boss (8) at the upper end of the holding location (7) is in close engagement with the terminal edge of the hollow cylinder (4) when the dose clip (6) is held outside the hollow cylinder (4).

8. Syringe accessory device according to claim 6, characterized in that the protruding height of the dose boss (8) is the distance the healthcare worker pushes the plunger rod core (10) towards the syringe outlet end (15) in order to provide the required injection dose.