CN101785891A - injector - Google Patents

Abstract

The invention discloses an injector for clinical use, consisting of a cylinder body, a piston and a push rod. The piston made of medical soft plastics is composed of a front body, a sealing ring, an edging ring, an arc-shaped groove and a barb ring; a retaining bar is arranged at the inner side of the front body; the surfaces of the sealing ring and the edging ring are smooth and the same in size; and an opening of the barb ring is oblique. The push rod is composed of a front ring, a retaining ring, a fixing ring, a high reinforced bar, a low reinforced bar and a pull ring, wherein the diameter of the fixing ring is slightly smaller than that of an inner cavity of the cylinder body and the height of the high reinforced bar is smaller than the diameter of the fixing ring. The injector contains no toxic substances such as sulfide and the like, saves labor in pushing and pulling even without silicon oil, avoids residual liquid medicine, prevents liquid leakage, realizes labor-saving technical assembling, and can be applied for clinical use instead of the traditional injector.

Description

A kind of syringe

Technical field the present invention relates to a kind of syringe of usefulness clinically, is the syringe that a kind of its inner carrier, push rod are different from conventional syringe inner seal ring, core bar specifically.

The syringe of the present usefulness clinically of background technology is by cylindrical shell, sealing ring, core bar is formed, sealing ring is made by rubber, rubber is a mixture, contain sulfide etc., when the syringe inner liquid medicine contacts with rubber, sulfide etc. are dissolved in the medicinal liquid, be expelled in the human body, harmful, circle before the sealing ring, groove and Qian Quan between the circle of back, the junction of back circle is not curved, easy pro-circle during the demoulding, stay the scratching trace on the circle of back, circle before making, back circle rough surface, poor lubricity, cause sealing ring activity difficulty in front and back in cylindrical shell big, for just the push-and-pull sealing ring is laborsaving, all coat silicone oil at present on the sealing ring surface, and silicone oil is a kind of invisible foreign body, and human body is not had benefit, and the back circle of sealing ring is less than preceding circle, make sealing ring easy slippage when movable in cylindrical shell, the gap is big between enclosing before sealing ring front portion and the push rod, and the anterior easily indent of sealing ring causes the cylindrical shell inner liquid medicine residual, the barb circle mouth at sealing ring rear portion does not have gradient, the assembling effort does not have ring for fixing, when core bar is pulled out during the anterior threading of core bar sealing ring in cylindrical shell on the core bar, during to barrel tip, amplitude of fluctuation is big, causes leakage easily, and core bar rear link muscle is with anterior concordant, higher, the core bar rear portion is in cylindrical shell the time, and amplitude of fluctuation is little, is unfavorable for operation.

Summary of the invention purpose of the present invention is exactly in order to solve the shortcoming that said syringe exists, and provide harmful substance such as a kind of not sulfur compound, push-and-pull push rod laborsaving, do not need to be coated with silicone oil in addition, be difficult for causing that medicinal liquid is residual, no leakage, technology assemble effortless syringe.

For reaching this purpose, the present invention adopts following technical scheme:

The present invention is by cylindrical shell, piston, push rod is formed, piston is made by medical flexible plastic, in harmful substance such as sulfur compound not, piston comprises precursor, sealing ring, arc groove, the deburring circle, the barb circle, there is tapering the precursor front portion, the precursor size shape matches with the cylindrical shell front inner wall, there is a grade muscle precursor inboard, the shelves muscle encloses before by push rod and is keeping off, make not indent of precursor, thereby make that the cylindrical shell inner liquid medicine can be not residual, the periphery of precursor has sealing ring, there is the deburring circle sealing ring back, deburring circle size is identical with sealing ring, it can make piston not slippage in cylindrical shell, between sealing ring and the deburring circle arc groove is arranged, arc groove and sealing ring, the arc that is connected to of deburring circle connects, this arc connects makes sealing ring, the deburring circle can not fallen by scratching when the demoulding, it can make sealing ring, deburring circle apparent height is smooth, lubricity is good, like this, piston front and back activity in cylindrical shell is just easy, piston face does not need to be coated with in addition silicone oil, thereby avoided the influence of silicone oil to human body, there is the barb circle deburring circle inboard, barb circle mouth is gradient, this gradient makes when the preceding circle of push rod is put in the piston, laborsaving, push rod is made of plastics, push rod comprises preceding circle, ring washer, ring for fixing, low muscle bar, high muscle bar, draw circle, preceding circle is contained in the piston, the size shape of preceding circle matches with piston cavity, there is ring washer the Qian Quan back, ring washer can keep off piston, make piston relatively stable, it is movable to be difficult for, there is ring for fixing the ring washer back, the ring for fixing size is slightly smaller than cylinder lumen, ring for fixing can make push rod in cylindrical shell during push-and-pull amplitude of fluctuation little, thereby make medicinal liquid in cylindrical shell, can not leak to piston, there is high muscle bar the back of ring for fixing, the height of high muscle bar is less than the diameter of ring for fixing, and high muscle bar has certain swing space in cylindrical shell, thereby the push-and-pull push rod smoothly, high muscle bar can make push rod smoothness run in cylindrical shell, low muscle bar height hangs down the muscle bar less than high muscle bar, circle before high muscle bar is connecting, ring washer, ring for fixing and La Quan draw the end of circle at push rod, draw circle greater than ring for fixing, ring washer, hold and drawing push-and-pull push rod on the circle, high muscle bar is done the swing in the certain limit in cylindrical shell, and push-and-pull is convenient.

Compare with present syringe, the flexible plastic piston that it is formed with precursor, sealing ring, deburring circle, arc groove, barb circle with Qian Quan, ring washer, ring for fixing, high muscle bar, low muscle bar, draw the push rod of circle composition to replace original sealing ring, core bar, make it not harmful substance such as sulfur compound, it is residual can not medicinal liquid to occur, the push-and-pull push rod is laborsaving, do not need to be coated with in addition silicone oil, no leakage, the technology assembling is simple, laborsaving.

Description of drawings Fig. 1 product structure figure

Among the figure: 1, cylindrical shell 2, precursor 3, sealing ring 4, deburring circle 5, arc groove 6, barb circle 7, preceding circle 8, ring washer 9, ring for fixing 10, high muscle bar 11, low muscle bar 12, draw circle 13, shelves muscle

Specific embodiment the present invention is by cylindrical shell 1, piston, push rod is formed, the cylindrical shell of using on the roughly the same present syringe of cylindrical shell 1, in the cylindrical shell 1 piston is arranged, push rod, piston is made by medical flexible plastic, piston is divided into precursor 2, sealing ring 3, deburring circle 4, arc groove 5, barb circle 6, there is tapering precursor 2 fronts, precursor 2 size shape match with cylindrical shell 1 anterior inboard, there is grade muscle 13 precursor 2 inboards, shelves muscle 13 makes precursor 2 be difficult for indent, precursor 2 peripheries have sealing ring 3, there is deburring circle 4 sealing ring 3 back, sealing ring 3, deburring circle 4 smooth surfaces, lubricity is good, sealing ring 3 is identical with deburring circle 4 sizes, between sealing ring 3 and the deburring circle 4 arc groove 5 is arranged, sealing ring 3, deburring circle 4 is connected with the arc that is connected between the arc groove 5, there is barb circle 6 deburring circle 4 inboards, 6 mouthfuls on barb circle is gradient, be inserted with the preceding circle 7 of push rod in the piston cavity, the push rod plastics are made, circle 7 before push rod is divided into, ring washer 8, ring for fixing 9, high muscle bar 10, low muscle bar 11, draw circle 12, preceding circle 7 size shape match with piston cavity, there is ring washer 8 preceding circle 7 back, there is ring for fixing 9 ring washer 8 back, and circle 7 outer piston positions play balance before 9 pairs of the ring for fixings, stable effect, there is high muscle bar 10 ring for fixing 9 back, high muscle bar 10 height are less than the diameter of ring for fixing 9, low muscle bar 11 height hang down muscle bar 11 less than high muscle bar 10, circle 7 before high muscle bar 10 is connecting, ring washer 8, ring for fixing 9 with draw circle 12, draw circle 12 to be positioned at the end of push rod, holding and drawing circle 12, push rod is drawn outward, and push rod drives piston and slides, and medicinal liquid is pumped down in the cylindrical shell 1, holding and drawing circle 12, to push away in the push rod, medicinal liquid promptly is injected in the human muscle, and it is easy to operate, effectively.

Claims (1)

1. syringe, by cylindrical shell (1), piston, push rod is formed, it is characterized in that: cylindrical shell has piston in (1), push rod, piston is made by medical flexible plastic, piston is divided into precursor (2), sealing ring (3), deburring circle (4), arc groove (5), barb circle (6), there is tapering precursor (2) front, there is a grade muscle (13) precursor (2) inboard, precursor (2) periphery has sealing ring (3), there is deburring circle (4) sealing ring (3) back, sealing ring (3), deburring circle (4) smooth surface, size is identical, between sealing ring (3) and the deburring circle (4) arc groove (5) is arranged, sealing ring (3), being connected to arc between deburring circle (4) and the arc groove (5) is connected, there is barb circle (6) deburring circle (4) inboard, barb circle (6) mouth is gradient, be inserted with the preceding circle (7) of push rod in the piston cavity, push rod is divided into preceding circle (7), ring washer (8), ring for fixing (9), high muscle bar (10), low muscle bar (11), draw circle (12), ring washer (8) is positioned at preceding circle (7) back, there is ring for fixing (9) ring washer (8) back, there is high muscle bar (10) ring for fixing (9) back, high muscle bar (10) height is less than the diameter of ring for fixing (9), low muscle bar (11) height is less than high muscle bar (10), low muscle bar (11), circle (7) before high muscle bar (10) is connecting, ring washer (8), ring for fixing (9), draw circle (12), draw circle (12) to be positioned at the end of push rod.