CN202620377U

CN202620377U - Low-resistance injector

Info

Publication number: CN202620377U
Application number: CN2012202414830U
Authority: CN
Inventors: 聂玉才; 巩柄贤
Original assignee: Shandong Shinva Ande Healthcare Apparatus Co Ltd
Current assignee: Shandong Shinva Ande Healthcare Apparatus Co Ltd
Priority date: 2012-05-25
Filing date: 2012-05-25
Publication date: 2012-12-26
Anticipated expiration: 2022-05-25

Abstract

The utility model relates to a low-resistance injector and belongs to the technical field of medical instruments. The low-resistance injector comprises a tube body, a mandrel and a piston, wherein the piston is installed at the front end of the mandrel, and the mandrel is assembled in the tube body. The low-resistance injector is characterized in that a front sealing ring and a rear sealing ring which are matched with the tube body are arranged outside the piston, the mandrel is connected with the piston through the head portion of the mandrel, an upper end face and a lower end face are arranged in the piston, the upper end face is correspondingly arranged at the front end of the rear sealing ring, the lower end face is correspondingly arranged at the rear end of the rear sealing ring, and corresponding end faces matched with the upper end face and the lower end face in shape are respectively arranged on the head portion of the mandrel. The low-resistance injector is simple in structure and small in resistance during using, the piston can slide in the tube body easily, and the diameter of the rear sealing ring of the piston changes along with pressure in the tube body, so that tight contact between the front sealing ring and the rear sealing ring and the inner wall of the tube body is ensured during working, leakage is effectively avoided, and the aims of low resistance and strong sealing are achieved.

Description

Injection with low resistance

Technical field

This utility model relates to a kind of injection with low resistance, belongs to the medical apparatus technical field.

Background technology

Syringe is a kind of medical apparatus commonly used in clinical; It is made up of cylindrical shell, piston, core bar usually; The syringe of above-mentioned composition generally is made up of macromolecular material, in order to prevent not leak between piston and the cylindrical shell, good sealing effectiveness is arranged; Piston must and cylindrical shell between enough magnitudes of interference are arranged, but the bigger magnitude of interference makes the operator need with bigger power piston to be moved.Glass syringe is also arranged in addition, be made up of cylindrical shell and core bar usually, frictional force is little between core bar and the cylindrical shell, and resistance is little, and sliding capability is good, but apparatus is broken easily in production and transportation, makes it and can not use.

The utility model content

According to above deficiency of the prior art, the technical problem that this utility model will solve is: a kind of injection with low resistance that uses simple in structure, convenient is provided.

The described injection with low resistance of this utility model; Comprise cylindrical shell, core bar and piston, piston is installed in the core bar front end, and core bar is assemblied in the cylindrical shell; It is characterized in that: the piston outside is provided with the preceding sealing ring and back sealing ring that cooperates with cylindrical shell; Core bar is connected with piston through the core bar head, and internal piston is provided with upper surface and lower surface, and the upper surface is positioned at the front end of back sealing ring relatively; The lower surface is positioned at the rear end of back sealing ring relatively, on the core bar head, is respectively equipped with the corresponding end face that matches with upper surface and lower surface shape.

Above-mentioned core bar head is mainly used in the installation piston, and its upper surface and lower surface mainly are that the diameter of back sealing ring is changed, to guarantee the sealing effectiveness of this utility model.

In this utility model, preferred said preceding seal diameter is greater than the back seal diameter.

In order further to realize the globality of this utility model, said core bar head and core bar are structure as a whole, and when producing, directly core bar head and core bar are injected into one.

Wherein, the shape of said upper surface and lower surface can be inclined-plane, plane or arc surface.

When using this utility model, under static state, because preceding seal diameter is greater than the back seal diameter, sealing ring contacts with the cylindrical shell medial wall earlier before the institute, thereby plays sealing effectiveness.When to drop-down core bar suction medicinal liquid, produce negative pressure in the cylindrical shell, attract piston to move upward; The upper surface of piston contacts with the corresponding end face of core bar head, and the back sealing ring of piston is swollen, and back sealing ring closely contacts with the medial wall of cylindrical shell; Thereby strengthened the sealing between piston and the cylindrical shell medial wall; Along with reducing of negative pressure, piston shrinks under self elastic effect, the shape when piston returns to resting state; When upwards promoting core bar; Piston is under the effect of core bar head, and the lower surface of piston contacts with the corresponding end face of core bar head, and the back sealing ring of piston is swollen; Back sealing ring closely contacts with the medial wall of cylindrical shell, thereby has strengthened the sealing between piston and the cylindrical shell medial wall.

The beneficial effect that this utility model had is:

Pass through this utility model; It is simple in structure, and resistance is little during use, and piston is prone in cylindrical shell, slide; And seal diameter changes along with the change of cylinder internal pressure behind the piston; So before when work guarantees, closely contact between sealing ring and back sealing ring and the cylinder inboard wall, prevented leakage effectively, thus the purpose that reaches lower resistance, seals by force.

Description of drawings

Fig. 1 is the structural representation of this utility model;

Fig. 2 is the piston structure sketch map;

Fig. 3 is the core bar structure sketch map;

Among the figure: 1, cylindrical shell 2, piston 3, core bar 4, core bar head 5, lower surface 6, back sealing ring 7, upper surface 8, preceding sealing ring.

The specific embodiment

Below in conjunction with accompanying drawing the embodiment of this utility model is done and to further describe:

Like Fig. 1, Fig. 2, shown in Figure 3, injection with low resistance comprises cylindrical shell 1, core bar 3 and piston 2; Piston 2 is installed in core bar 3 front ends, and core bar 3 is assemblied in the cylindrical shell 1, and piston 2 outsides are provided with the preceding sealing ring 8 and back sealing ring 6 that cooperates with cylindrical shell 1; Preceding sealing ring 8 diameters are greater than back sealing ring 6 diameters, and core bar 3 is connected with piston 2 through core bar head 4, and core bar head 4 is structure as a whole with core bar 3; Piston 2 inside are provided with upper surface 7 and lower surface 5; Upper surface 7 is positioned at the front end of back sealing ring 6 relatively, and lower surface 5 is positioned at the rear end of back sealing ring 6 relatively, on core bar head 4, is respectively equipped with the corresponding end face that matches with upper surface 7 and lower surface 5 shapes.

Wherein, the shape of said upper surface 7 and lower surface 5 can be inclined-plane, plane or arc surface, selects the inclined-plane that is shaped as of upper surface 7 and lower surface 5 in the present embodiment for use.

In the use, under static state, because preceding sealing ring 8 diameters are greater than back sealing ring 6 diameters, sealing ring 8 contacts with cylindrical shell 1 medial wall earlier before the institute, thereby plays sealing effectiveness.When to drop-down core bar 3 suction medicinal liquids, produce negative pressure in the cylindrical shell 1, attract piston 2 to move upward; The upper surface 7 of piston 2 contacts with the corresponding end face of core bar head 4, and the back sealing ring 6 of piston 2 is swollen, and back sealing ring 6 closely contacts with the medial wall of cylindrical shell 1; Thereby strengthened the sealing between piston 2 and cylindrical shell 1 medial wall; Along with reducing of negative pressure, piston 2 shrinks under self elastic effect, the shape when piston 2 returns to resting state; When upwards promoting core bar 3; Piston 2 is under the effect of core bar head 4; The lower surface 5 of piston 2 contacts with the corresponding end face of core bar head 4; The back sealing ring 6 of piston 2 is swollen, and back sealing ring 6 closely contacts with the medial wall of cylindrical shell 1, thereby has strengthened the sealing between piston 2 and cylindrical shell 1 medial wall.

Claims

1. injection with low resistance; Comprise cylindrical shell (1), core bar (3) and piston (2); Piston (2) is installed in core bar (3) front end; Core bar (3) is assemblied in the cylindrical shell (1), it is characterized in that: piston (2) outside is provided with preceding sealing ring (8) and the back sealing ring (6) that cooperates with cylindrical shell (1), and core bar (3) is connected with piston (2) through core bar head (4); Piston (2) inside is provided with upper surface (7) and lower surface (5); Upper surface (7) is positioned at the front end of back sealing ring (6) relatively, and lower surface (5) are positioned at the rear end of back sealing ring (6) relatively, on core bar head (4), are respectively equipped with the corresponding end face that matches with upper surface (7) and lower surface (5) shape.

2. injection with low resistance according to claim 1 is characterized in that: sealing ring (8) diameter is greater than back sealing ring (6) diameter before said.

3. injection with low resistance according to claim 1 and 2 is characterized in that: said core bar head (4) is structure as a whole with core bar (3).

4. injection with low resistance according to claim 3 is characterized in that: the shape of said upper surface (7) and lower surface (5) can be inclined-plane, plane or arc surface.