CN201020109Y

CN201020109Y - Simple safety self-destructing injector

Info

Publication number: CN201020109Y
Application number: CNU2007200790602U
Authority: CN
Inventors: 魏川人
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-06
Filing date: 2007-04-06
Publication date: 2008-02-13
Anticipated expiration: 2017-04-06

Abstract

The utility model discloses a simple, safe self-destruction injector, consisting of a needle point, a needle stand, a spring, a housing, a gum plug and a core bar. The spring is sheathed on the needle point in the needle stand; the spring holder at the rear of the needle point is matched with a cone interface at the front of the housing by sealing; a sharp puncture part at the rear bulges the inside of the cone interface; a vacant part is communicated through the front end at the conjunction of the core bar cross plate; the bulged thin wall at the end of gum plug is in tension due to the effect of the front end. As the injection is finished, if extra force is applied to push the core bar, the cone interface at the front end of the housing will break down and the exposed part of the needle point will be drawn back due to the push of spring elastic force. The injector cannot be used anymore. The utility model, with a lower cost than prior injector with the same function, is applicable to self-destruction injector for various dosages.

Description

Simple safety self-destructing syringe

Technical field

This utility model relates to a kind of medical apparatus and instruments, particularly a kind of simple safety self-destructing syringe.

Background technology

In existing self-destruction syringe, application number is 03278769.3,200320123617.X and 200320120208.4 self-destruction syringe, provide a kind of core bar that utilizes at the progradation latter end, its end assembly pushes mutually with needle stand or outer jacket member, needle stand or outer jacket member are come off, and spring into the core bar inner chamber, thereby syringe construction is destroyed and needle tip retracts is concealed the technical scheme that function realizes in the lump by spring.Its defective is that application number is 03278769.3 self-destruction syringe, and it utilizes the protruding thorn of needle stand afterbody to puncture the technical scheme of plug front end thin-walled, can make its function realize becoming uncertain because of the elastic deformation of plug thin-walled; Overcome this defective though application number is the self-destruction syringe of 200320123617.X and 200320120208.4, it decides the technical scheme that the journey piston is made up of plug, core bar and back plug, then than the former more than again a member, increased production cost.In addition, above-mentioned three kinds of self-destruction syringes have all adopted at the needle point periphery fixes a needle stand, the needle stand periphery overlaps a spring, the technical scheme that the spring outside is overlapped overcoat or outer cap bag again, its realization to allomeric function is not all to be necessary, is unfavorable for implementing on the very limited low dose of self-destruction syringe in inner space.

The utility model content

The purpose of this utility model is to provide a kind of simple safety self-destructing syringe, realizes the self-destroying function that its structural deterioration and needle tip retracts are concealed with member structure still less.For reaching this purpose, this utility model has adopted following technical scheme:

A kind of simple safety self-destructing syringe is made up of needle point, needle stand, overcoat, plug and core bar.It is characterized in that: described needle point rear body has spring base and puncture portion; The rear end of described spring base is an outer conical surface; Described needle stand front portion is the needle point conduit, and the middle part is a spring guide, and the rear portion is the engaging outer shroud; Described overcoat nose circle conical surface central authorities are convexly equipped with the circular cone interface of an identical wall thickness by ring awl thin-walled and annular thin wall; There are at least two boss the angle of described annular thin wall outer ring surface and circular cone interface outer conical surface; Described plug end face central authorities are protruding thin-walled; The initial part inwall of described protruding thin-walled has annular lip; The portion that has vacant position of the intersection of described core bar crossed stiffened plate; Described vacancy portion runs through described core bar front end and forms through hole; Described core bar front end periphery has annular groove; Described needle point body periphery overlaps a spring, and described needle point conduit is passed in its front portion, and the internal conical surface of the outer conical surface of its rear portion spring base and described circular cone interface is close to; Described spring is in limit compressive state in described spring guide; The annular lip of described plug engages with the annular groove of described core bar, makes described plug projection thin-walled end be in tight state.

The wall thickness of above-mentioned outer sleeve awl thin-walled, annular thin wall and circular cone interface is 0.1mm-0.5mm.

The wall thickness of above-mentioned plug projection thin-walled is 0.1mm-0.5mm, and its limit elastic deformation amplitude is greater than the length of needle point rear end puncture portion.

The joint portion of above-mentioned needle stand and overcoat is concavo-convex snap-in structure.

Above-mentioned needle point pipe inner wall and needle point body periphery are slidingly matched for stable.

During use, promote core bar the medicinal liquid pressurized is flowed out from needle point.When plug projection thin-walled end face contacted naturally with the overcoat annular thin wall, needle point rear end puncture portion can not puncture it because of the elastic deformation of plug projection thin-walled end face.When injection finished reinforcing continuation promotion core bar, overcoat annular thin wall, circular cone interface and at least two boss were with respect to the displacement vertically of needle point spring base integral body, and the weak connecting portion between its at least two boss ftractures under the retroaction of spring base outer conical surface.Simultaneously, plug projection thin-walled is further pressed to needle point rear end puncture portion, and protruding thin-walled is punctured because of surpassing its limit elastic deformation amplitude, and its otch further ftractures under the effect of spring base outer conical surface.Needle point is under spring force promotes, and its postmedian springs in the core bar vacancy portion.So far, this utility model can not be rebuild hermetically-sealed construction with spring base again because of its overcoat circular cone interface and can not re-use, and the exposed parts indentation needle stand inner chamber safety of needle point body is concealed.

This utility model adopts above technical scheme, conceals under the prerequisite of function realization in its structural deterioration of assurance and needle tip retracts, makes its overall structure more simple than existing congenerous self-destruction syringe, is beneficial to reduce production costs.And, owing to be operational objectives directly, make the self-destruction member only take little room with the needle point, be beneficial to low dose of self-destruction syringe and implement.Have and save and practical characteristics.

Description of drawings

Fig. 1, exploded perspective structural representation of the present utility model.

Fig. 2, combination stereochemical structure cutaway view of the present utility model.

Fig. 3, the local amplification view of combination stereochemical structure of the present utility model.

The stereochemical structure cutaway view of Fig. 4, this utility model overcoat front end assemblies.

The stereochemical structure cutaway view of Fig. 5, this utility model needle stand.

The stereochemical structure cutaway view of Fig. 6, this utility model needle point embodiment 1.

The stereochemical structure cutaway view of Fig. 7, this utility model needle point embodiment 2.

The stereochemical structure cutaway view of Fig. 8, this utility model plug.

The perspective view of Fig. 9, this utility model core bar.

The stereochemical structure cutaway view that Figure 10, this utility model structural deterioration and needle tip retracts are concealed.

The specific embodiment

Shown in Fig. 1 to 10, a kind of simple safety self-destructing syringe is made up of needle stand 1, spring 2, needle point 3, overcoat 4, plug 5, core bar 6 and needle guard 7.

Fig. 6 and 7 provides two kinds of embodiments of needle point 3.The identical point of two kinds of embodiments is: needle point body 31 rear ends are sharp puncture portion 32, its position an ancient unit of weight that closes on puncture portion 32 be provided with spring base 33 or 33 '; The rear end of spring base be outer

conical surface

331 or 331 '.The difference of two kinds of embodiments is: the front portion of spring base 33 is made as positioning catheter 332, spring base 33 ' front end be made as detent 332 '; Spring base 33 is one-body molded with needle point body 31, spring base 33 ' be adhesively fixed with needle point body 31.

The front portion of needle stand 1 is a needle point conduit 11, and the middle part is a spring guide 12, and the rear portion is engaging outer shroud 13, and the periphery of

conduit

11,12 has axially stablizes gusset 14.Engaging outer shroud 13 inner chambers have engaging depressed part 131.The internal diameter of conduit 11 makes both form stable being slidingly matched approximately greater than the external diameter of needle point body 31.The stable implication that is slidingly matched is meant, though needle point body 31 in conduit 11, can be promoted by spring 2, can not double swerve.

Overcoat 4 front end peripheries have snap fit tabs portion 41, and the central authorities of its nose circle conical surface are convexly equipped with the circular cone interface 44 of an identical wall thickness by ring awl thin-walled 42 and annular thin wall 43.The angle of annular thin wall 43 outer ring surfaces and circular cone interface 44 outer conical surface is convexly equipped with a plurality of circumferential boss 45 (at least two), makes its spacer portion form the weak connection of relative thin.The wall thickness of ring awl thin-walled 42, annular thin wall 43 and circular cone interface 44 is 0.1mm-0.5mm.The internal conical surface 441 of circular cone interface 44 and spring base outer conical surface 331,331 ' tapering identical, and become contact to be sealed and matched.

Plug 5 front end faces central authorities are protruding thin-walled 51.The initial part inwall of projection thin-walled 51 has annular lip 52.The wall thickness of projection thin-walled 51 is 0.1mm-0.5mm, and its end is under needle point puncture portion 32 effect, and the limit elastic deformation amplitude that is not punctured is greater than the length of needle point puncture portion 32.

The portion 61 that has vacant position of the intersection of core bar 6 crossed stiffened plates.The end that vacancy portion 61 extends to core bar 6 forms through hole 62.The periphery of core bar 6 front ends has annular groove 63.The internal diameter of through hole 62 is greater than the external diameter of spring base 33 (or 33 ', down with) and the wall thickness sum of plug thin-walled 51.The 43 one-tenth axial corresponding matching in core bar 6 ends and plug thin-walled 51 front ends and annular thin wall.

During the location, needle point body 31 passes spring 2, makes the inner end of spring 2 enter positioning catheter 332 inner chambers (or detent 332 ').Needle point body 31 front ends pass needle point conduit 11, make the outer end of spring 2 enter spring guide 12 inner chambers.The outer conical surface 331 of spring base (or 331 ', be butted on the internal conical surface 441 of overcoat circular cone interface 44 down together), with external force the engaging depressed part 131 of needle stand engaging outer shroud is engaged with overcoat snap fit tabs portion 41, the spring 2 stressed limit compressive states that are in, internal conical surface 431 and the outer conical surface 331 stressed formation sealing states of being close to.Core bar 6 front ends insert plug 5 inner chambers, prop up protruding thin-walled 51, make its further projection with external force, engage with annular groove 63 until annular lip 52, and protruding thin-walled 51 ends are tight state because of elastic deformation is in.At last plug 5 is inserted overcoat 4 inner chambers.

During use, promote core bar 6 the medicinal liquid pressurized is flowed out from needle point 3.When protruding thin-walled 51 end faces contacted naturally with overcoat annular thin wall 43, puncture portion 32 can not puncture it because of the elastic deformation of protruding thin-walled 51.When injection finishes, when afterburning continuation promotes core bar 6, the spring 2 that needle point spring base 33 is in limit compressive state stops and can not move, make annular thin wall 43, circular cone interface 44 and boss 45 with respect to the displacement vertically of spring base 33 integral body, the weak connecting portion between the boss 45 is torn under the retroaction of spring base outer conical surface 331 support power.Because the further propelling of core bar, needle point puncture portion 32 further acts on protruding thin-walled 51 end faces, and it is punctured because of the elastic deformation amplitude that oversteps the extreme limit, and its otch further ftractures under the effect of outer conical surface 331.Needle point 3 is under spring force promotes, and its postmedian passes protruding thin-walled 51 end face breaches and through hole 62, springs in the core bar vacancy portion 61.So far, this utility model can't be rebuild and can not re-use with the sealing state of spring base outer conical surface 331 because of the internal conical surface 441 of its circular cone interface, and the inner chamber safety of the exposed parts indentation needle stand 1 of needle point body 31 is concealed.

Claims

1. a simple safety self-destructing syringe is made up of needle point, needle stand, overcoat, plug and core bar, it is characterized in that: described needle point rear body has spring base and puncture portion; The rear end of described spring base is an outer conical surface; Described needle stand front portion is the needle point conduit, and the middle part is a spring guide, and the rear portion is the engaging outer shroud; Described overcoat nose circle conical surface central authorities are convexly equipped with the circular cone interface of an identical wall thickness by ring awl thin-walled and annular thin wall; There are at least two boss the angle of described annular thin wall outer ring surface and circular cone interface outer conical surface; Described plug end face central authorities are protruding thin-walled; The initial part inwall of described protruding thin-walled has annular lip; The portion that has vacant position of the intersection of described core bar crossed stiffened plate; Described vacancy portion runs through described core bar front end and forms through hole; Described core bar front end periphery has annular groove; Described needle point body periphery overlaps a spring, and described needle point conduit is passed in its front portion, and the internal conical surface of the outer conical surface of its rear portion spring base and described circular cone interface is close to; Described spring is in limit compressive state in described spring guide; The annular lip of described plug engages with the annular groove of described core bar, makes described plug projection thin-walled end be in tight state.

2. a kind of simple safety self-destructing syringe as claimed in claim 1 is characterized in that: the wall thickness of described outer sleeve awl thin-walled, annular thin wall and circular cone interface is 0.1mm-0.5mm.

3. a kind of simple safety self-destructing syringe as claimed in claim 1 is characterized in that: the wall thickness of described plug projection thin-walled is 0.1mm-0.5mm, and its limit elastic deformation amplitude is greater than the length of needle point rear end puncture portion.

4. a kind of simple safety self-destructing syringe as claimed in claim 1 is characterized in that: the joint portion of described needle stand and overcoat is concavo-convex snap-in structure.

5. a kind of simple safety self-destructing syringe as claimed in claim 1 is characterized in that: described needle point pipe inner wall and needle point body periphery are slidingly matched for stable.