WO2017012432A1

WO2017012432A1 - Sealed syringe

Info

Publication number: WO2017012432A1
Application number: PCT/CN2016/084984
Authority: WO
Inventors: 赵继龙; 王强
Original assignee: 山东新华安得医疗用品有限公司
Priority date: 2015-07-20
Filing date: 2016-06-06
Publication date: 2017-01-26
Also published as: CN104958812A

Abstract

Disclosed is a sealed syringe, comprising an outer cylinder (1), a core rod (3) and a piston (2). The outer cylinder (1) is provided with a limited location structure on the inner ring of the rear end thereof. A sealing element (5) is mounted on the core rod (3). A cavity (4) is provided between the part on the core rod (3) which is located above the sealing element (5) and the inner wall of the outer cylinder (1). When the piston (2) is located at the foremost end of the inner cavity of the outer cylinder (1), the distance between the sealing element (5) and the rear end limited location structure of the outer cylinder (1) is not greater than the distance between the end face first seal ring of piston (2) and the sealing element (5) The sealed syringe is capable of storing the aerosol volatized from the medicine liquid droplets in the outer cylinder (1) in the cavity (4) sealed between the core rod (3) and the outer cylinder (1), so that the aerosol is completely isolated from the atmosphere, thus ensuring that the medicine liquid does not come into contact with health care workers during the entire usage process of the syringe. It is effective in avoiding the hazards of drugs and aerosol leakage for the operator, thereby having high security and reliability.

Description

Sealed syringe

Technical field

The invention relates to a sealed syringe, belonging to the field of medical instruments.

Background technique

At present, in the clinical treatment of tumors, the therapeutic dose and the poisoning dose of most anti-tumor drugs applied are very close, and some even have no obvious boundaries, especially cyclophosphamide. During the configuration process, the operator contacts through the skin. It is affected by low-dose drugs in the respiratory inhalation route, and has potential risks such as carcinogenicity, teratogenicity and organ damage, which is very unfavorable to the operator.

At present, the main syringe used in the hospital is a common syringe. When the ordinary syringe is pumping the liquid, the liquid will remain on the inner wall of the outer cylinder, and the liquid on the inner wall will form an aerosol, which will cause damage to the human body when it is diffused into the air. When the core rod is completely pulled out, the core rod will contact the residual liquid medicine on the inner wall of the outer cylinder, and the residual liquid medicine may cause harm to the human body by contact with the human body.

Summary of the invention

According to the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a sealed syringe capable of effectively preventing the leakage of drugs and aerosols to the operator.

The sealed type injector of the invention comprises an outer tube, a core rod and a piston, a limiting structure is arranged on the inner ring of the rear end of the outer tube, and a sealing member is mounted on the core rod; a part of the core rod above the sealing member and the outer tube There is a cavity between the inner walls; when the piston is at the foremost end of the inner cavity of the outer cylinder, the distance between the sealing member and the rear end of the outer cylinder is not greater than the distance between the first sealing ring of the piston end face and the sealing member.

The invention utilizes a seal on the piston and the core rod to separate the cavity between the core rod and the outer cylinder from the remaining cavity in the syringe to form a closed space; the inner end of the outer cylinder has a finite structure on the inner ring to limit the core rod Displacement, and when the piston is at the foremost end of the outer cylinder cavity, the distance between the seal and the rear end of the outer cylinder is not greater than the distance between the first seal ring of the piston end face and the seal. Thus, when using the syringe to draw liquid, the syringe can not continue to draw liquid after extracting at most half of the volume of the syringe, and the liquid will only remain in the upper inner cavity of the outer cylinder, and the portion of the core rod below the seal will not When the liquid is contacted, when the liquid injection in the syringe is completed (the core rod is pushed up to the top of the outer cylinder), the seal on the core rod still does not contact the liquid droplets remaining in the inner cavity of the upper portion of the outer cylinder, and remains in the outer cylinder. The liquid droplets in the upper inner cavity evaporate into an aerosol and are stored in the cavity between the core rod and the outer cylinder and are completely isolated from the outside atmosphere, so that the aerosol cannot be in contact with the outside, thereby ensuring the entire syringe. During use, the liquid medicine will not come into contact with medical personnel, effectively avoiding the harm of the leakage of drugs and aerosols to the operator, and has high safety and reliability.

Preferably, the diameter of the portion of the core rod above the sealing member gradually increases from the intermediate portion to the both ends, thereby making the portion A closed cavity is formed between the sub-structure and the inner wall of the outer cylinder. When the core rod moves up and down, the aerosol in the cavity does not diffuse into the air, thereby avoiding injury of medical personnel.

Preferably, the limiting structure is a limiting protrusion. Corresponding to the limit protrusion, a boss can be arranged in a portion of the core rod below the sealing member, the diameter of the circle at the highest point of the boss is larger than the diameter of the circle at the highest point of the limit protrusion, and the boss is located at the rear end of the outer tube. Up from the top, so that the sealing member and the upper portion of the sealing member are always located inside the outer cylinder and prevent the core rod from continuing to move downward; and the core rod can be installed. The outer diameter of the portion of the sealing member is larger than the diameter of the circle at the highest point of the limiting projection, and the portion is located above the limiting projection, so that the sealing member on the core rod and the portion above the sealing member are always located inside the outer cylinder.

The above-mentioned limiting protrusion may be integrally connected with the outer tube; or may be connected to the outer tube separately, and the limiting protrusion is fixed on the inner wall of the outer tube.

The beneficial effects of the present invention over the prior art are:

The sealed syringe can store the aerosol evaporated from the liquid droplets in the outer cylinder in a closed cavity between the core rod and the outer cylinder, so that the aerosol is completely isolated from the outside atmosphere, thereby ensuring the entire use of the syringe. In the process, the liquid medicine does not come into contact with the medical staff, which effectively avoids the harm of the leakage of drugs and aerosols to the operator, and has high safety and reliability.

DRAWINGS

Figure 1 is a schematic view showing the structure of the suction state of the present invention;

Figure 2 is a partial enlarged view of the I portion of Figure 1;

Fig. 3 is a schematic view showing the structure of the piston of the present invention pushed to the foremost end of the inner cavity of the outer cylinder.

In the figure: 1, outer cylinder; 2, piston; 3, core rod; 4, cavity; 5, seal; 6, boss; 7, limit protrusion.

detailed description

The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

As shown in FIGS. 1 to 3, the sealed syringe includes an outer cylinder 1, a core rod 3 and a piston 2, and a limiting protrusion 7 is arranged on the inner ring of the rear end of the outer cylinder 1, and a sealing member 5 is mounted on the core rod 3 (this embodiment) In the example, a sealing ring is used; on the core rod 3, a portion between the portion above the sealing member 5 and the inner wall of the outer cylinder 1 has a cavity 4; when the piston 2 is located at the foremost end of the inner cavity of the outer cylinder 1, the sealing member 5 and the outer cylinder The distance b between the rear end stop structures is not greater than the distance a between the first seal ring of the end face of the piston 2 and the seal 5. In this embodiment, the diameter of the portion of the core rod 3 above the sealing member 5 gradually increases from the intermediate portion to the both ends, so that a closed cavity 4 is formed between the portion of the structure and the inner wall of the outer cylinder 1, and the core rod 3 is formed. When moving up and down, the aerosol in the cavity 4 does not diffuse into the air, thereby avoiding injury to medical personnel.

In this embodiment, corresponding to the limiting protrusion 7, a boss 6 is disposed in a portion of the core rod 3 below the sealing member 5. The boss 6 is circumferentially arranged in a circle, and the diameter of the circle at the highest point of the boss 6 is larger than the limit convex. The diameter of the circle at which the highest point is 7 is located, and the boss 6 is located above the rear end limit projection 7 of the outer cylinder 1. When the core rod 3 is pulled downward, the highest point of the boss 6 on the core rod 3 is located. The diameter of the circle is larger than the diameter of the circle at which the highest point of the limiting protrusion 7 is located, so when the boss 6 on the core rod 3 contacts the limiting protrusion 7 at the rear end of the outer cylinder 1, the core rod 3 stops moving, thereby passing through the boss 6 Cooperating with both of the limiting projections 7 to define the downward movement of the syringe plunger 3 such that the seal 5 on the core 3 and the portion above the seal 5 are always located inside the outer cylinder 1.

When using the syringe to draw liquid, the syringe can not continue to draw liquid after extracting at most half of the volume of the syringe, that is, when the core rod 3 stops moving downward, the piston 2 is in the middle or upper part of the outer cylinder 1, and the liquid medicine only remains. In the upper inner cavity of the outer cylinder 1, the portion of the core rod 3 below the sealing member 5 (including the sealing member 5) does not come into contact with the chemical liquid. When the liquid bolus in the syringe is completed, the core rod 3 is pushed up to the top end of the outer cylinder 1, and the portion having the liquid medicine is the upper portion of the core rod 3 which is in contact with the upper inner cavity of the outer cylinder 1, and the seal on the core rod 3 5 and the portion below the sealing member 5 still does not contact the liquid droplets remaining in the inner cavity of the outer cylinder 1, and the liquid droplets remaining in the inner cavity of the outer cylinder 1 are volatilized into an aerosol and stored in the core rod. 3 in the cavity 4 between the outer cylinder 1 and completely isolated from the outside atmosphere, so that the aerosol can not be in contact with the outside, thereby ensuring that the liquid medicine does not come into contact with the medical staff during the entire use of the syringe, effectively avoiding the medicine And the leakage of aerosols and the like to the operator, safety and reliability.

Claims

A sealed syringe comprises an outer cylinder (1), a core rod (3) and a piston (2), and a limiting structure is arranged on the inner ring of the rear end of the outer cylinder (1), characterized in that: the core rod (3) is mounted a seal (5); a core (3) having a cavity (4) between a portion above the seal (5) and an inner wall of the outer cylinder (1); when the piston (2) is located in the outer cylinder (1) At the foremost end of the cavity, the distance between the seal (5) and the rear end of the outer cylinder (1) is not greater than the distance between the first seal ring of the piston (2) and the seal (5).
A sealed syringe according to claim 1, characterized in that the diameter of the portion of the core rod (3) above the sealing member (5) gradually increases from the intermediate portion toward both ends.
The sealed syringe according to claim 1 or 2, characterized in that the limiting structure is a limiting protrusion (7).
The sealed syringe according to claim 3, characterized in that, corresponding to the limiting projection (7), a boss (6) is provided at a portion of the core rod (3) below the sealing member (5), and the boss (6) The diameter of the circle at the highest point is larger than the diameter of the circle at the highest point of the limit projection (7), and the boss (6) is located above the rear end limit projection (7) of the outer cylinder (1).
The sealed syringe according to claim 3, characterized in that the outer diameter of the portion of the core rod (3) on which the sealing member (5) is mounted is larger than the diameter of the circle at the highest point of the limiting projection (7), and the portion Located above the limit projection (7).
The sealed syringe according to claim 3, wherein the limiting protrusion (7) is connected to the outer tube (1), and the limiting protrusion (7) is fixed on the inner wall of the outer tube (1). .