CN2553813Y - Syringe with self-distruction structure - Google Patents

Abstract

The utility model provides a syringe with a new clamp self-destruction structure, which improves the prior art, and comprises a needle cylinder component, a needle rod component and a needle seat component. A clamping self-destruction structure is arranged between the needle rod component and the needle seat component so as to clamp the needle rod component and the needle seat component together; the clamping self-destruction structure is formed by a hook part at the front of the needle rod component and a containing cavity part in the needle seat component. By use of the clamping self-destruction structure, the needle seat component of a used syringe can be forcedly drawn back to the needle cylinder component which is the middle part of the needle cylinder, thereby realizing the aim of protective self-destruction and preventing using again. Apart from the advantages of the prior art, the utility model further has advantages of perfect integral sealing performance and low cost as well as direct and convenient operation, thereby being capable of substituting the prior syringe.

Description

Syringe with novel engaging self-distruction structure

Invention field

The present invention relates to disposable medical instrument, be a kind of novel injector with engaging self-desttruction equipment.

Background technology

Conventional injector, great majority by syringe, shank, and entry needle formed.Syringe is a cylindrical shape, and pin is sleeved on the overhanging needle adapter (or needle stand) of syringe bottom separably, this needle stand and syringe integrated injection molding.Shank one end has piston, is used for the injection in the tube is expelled in the human body by tube head, pin; The other end of shank has handle, and there is the outer hand rest of opening the syringe end in addition, when injection by handle and hand rest with the injecting liquid drug in the syringe in human body.There is following defective in use in this syringe:

1, because curative activity is a rigorous job of preventing and curing diseases, prophylactic propagation is especially for can not be ignored because of directly contact factors such as infection with virus.But often there are some lawless persons to collect or reclaim exhausted disposable syringe for the individual interest of oneself in the society, sell through packing again, bring many drawbacks to curative activity; And existing syringe itself does not have mandatory breaking-up device, and the lawless person is had an opportunity to take advantage of.

2, existing syringe is on the needle stand owing to using its entry needle of back still to be sleeved on the injector syringe, and syringe needle is exposed, stabs human body easily, particularly stabs medical personnel and post processing personnel, and it is infected.

Based on above-mentioned situation, the inventor has proposed a series of syringes with self-desttruction equipment, wherein typical technology is that application number is 01279647.6 patent application, referring to Fig. 1, syringe includes syringe assembly 100`, shank assembly 200` in this patent, this syringe assembly 100` comprises the syringe 110` with needle cylindrical unit 111` at least, and shank assembly 200` is sleeved in the needle cylindrical unit 111`; And further including needle stand assembly 300`, this needle stand assembly 300` is positioned on the place, bottom in the needle cylindrical unit 111`; Described needle stand assembly 300` has medicine liquid channel hole 311` therein, on needle stand assembly 300`, exit that should medicine liquid channel hole 311` is had the entry needle mount pad or connects mounted head 312`, to should needle stand assembly mount pad or connect on the needle cylindrical unit base wall of mounted head and have through hole 112`; Between shank assembly 200` and needle stand assembly 300`, have and one both are fastened togather, and can make needle stand assembly 300` engage self-distruction structure along what the needle cylindrical unit inwall among the syringe assembly 100` slided with shank assembly 200`.Described engaging self-distruction structure is to be made of the 315` of cavity volume portion in hook portion 221` on the shank assembly and the needle stand assembly, this hook portion is in the front portion of shank assembly, and this cavity volume portion can make above-mentioned hook portion insert and rotate one less than behind an angle of 90 degrees degree both being fastened togather.The described shank hook 220` that has hook portion 221` links to each other with shank 210` by screw connection structure, and this shank hook can be with shank suit or be inlaid in the shank piston rotationally, and the cavity volume portion in its needle stand piston has and holds the cavity volumes of hook portion rotation one less than 90 degree, this technology is when finishing using, hook portion is inserted in the cavity volume portion, rotation through shank is fastened togather hook portion and cavity volume portion, thereby shank assembly and needle stand assembly are fastened togather, when outside pulling shank, the needle stand assembly is moved with shank, to reach the purpose of self-destruction, there is following defective in this structure: 1 when reality is used, because between shank hook and the shank piston is rotating fit structure, its sealing property can't guarantee, thereby make air admission unavoidably, to influence its injection effect; 2, its cavity volume portion must guarantee its hook portion rotation one angle less than 90 degree, its cavity volume portion cavity is bigger, when medicinal liquid sucks, air in the needle tubing is more, on the one hand, influences the suction volume of medicinal liquid, perhaps once can not fully suction medicinal liquid should be arranged, on the other hand, must after medicinal liquid sucks, the air in its needle tubing be discharged, influence its medical worker's work efficiency; 3, the structure of hook and cavity volume portion is complicated, as screw connection structure etc., has improved its whole cost; 4, because this technology mainly adopts irregular syringe cylinder structure, as oval-shaped planform,, be difficult to spur the needle stand piston when hook portion and cavity volume portion snap fit are not very to put in place, can not fully reach the purpose of self-destruction.

Based on the existing defective of above-mentioned technology, the inventor improves and improves its structure, the function preferably that this technology embodied is all given to keep, between pin medicated cap and syringe, frangibility structures on the shank etc., it mainly improves at shank hook and needle stand piston.

Summary of the invention

The objective of the invention is to mainly is to provide a kind of in use just can carry out destructive to its parts and handle, effectively prevent to be utilized once more at the existing defective of above-mentioned technology, and can make the pin retraction and prevent the infectious self-destroyed syringe with novel snap-in structure of source of disease; Tangible advantages such as this syringe has simple and reasonable for structure, and is easy to use and reliable.

The objective of the invention is to realize in the following manner: have the syringe of novel engaging self-distruction structure, include syringe assembly, shank assembly and needle stand assembly; This syringe assembly comprises the syringe with needle cylindrical unit at least, has pilot hole in the needle cylindrical unit bottom, the shank assembly is contained in the needle cylindrical unit, and this needle stand assembly is positioned on place, the intravital bottom of syringe by pilot hole, and described needle stand assembly has the medicine liquid channel hole of perforation therein; Described shank assembly includes shank, shank hook and shank piston, and shank links to each other with the shank hook, and the shank piston is installed in shank and shank hook junction; Described needle stand assembly includes needle stand, needle stand piston and hook reservoir body; This hook reservoir body be inlaid in the needle stand piston and be in of the cooperation of the forward needle stand of needle stand piston and firmly link to each other by interference, it is characterized in that: between shank assembly and needle stand assembly, have and one both are fastened togather, and can make the needle stand assembly engage self-distruction structure along what the needle cylindrical unit inwall in the syringe assembly moved with the shank assembly; This engaging self-distruction structure before by the shank assembly hook portion and the cavity volume portion in the needle stand assembly constitute; Described hook portion is the front portion hook of shank hook, and this hook portion is made of head and waist, and the outline height dimension of this head is greater than the waist height size, and described cavity volume portion is in the needle stand assembly, and its shape matches with hook portion.By this engaging self-distruction structure can be firmly be the syringe middle part in the needle stand assembly withdrawal syringe assembly with used syringe, reach the self-destruction purpose of protectiveness, in case be utilized once more.

The present invention is except that having the due superiority of above-mentioned technology institute, as self-destruction, reliability of manipulating etc., also owing in this invention, adopt hook portion directly to insert the engaging self-distruction structure of cavity volume portion, be different from the structure that both is fastened togather by spiral (less than an angle of 90 degrees), it is manipulated directly, convenience, its overall tightness is better, and the same with existing general syringe have a good sealing property; Its structure connection employing interference fit connection, one side can satisfy the function of syringe attended operation, and it is easy to process on the other hand simply, assemble, thereby has reduced the cost of this syringe widely, can better substitute conventional injector.

Description of drawings

Below in conjunction with accompanying drawing technical scheme of the present invention is further described:

Fig. 1 is the prior art constructions sketch map;

Fig. 2 is a schematic perspective view of the present invention;

Fig. 3 is the assembling schematic perspective view according to a kind of syringe that technical theme of the present invention proposed; (being embodiment one);

Fig. 4 is longitudinal section (along its long axis direction) structural representation of embodiment one;

Fig. 5 is longitudinal section (along its short-axis direction) structural representation of embodiment one;

Fig. 6 is a shank structure of piston sketch map among the embodiment one, and wherein Fig. 6 a is a structure chart, and Fig. 6 b is a left view, and Fig. 6 c is a right view;

Fig. 7 is the structural representation of hook reservoir body among the embodiment one, and wherein Fig. 7 a is a structure chart, and Fig. 7 b is a left view, and Fig. 7 c is a right view;

Fig. 8 is a needle stand structure of piston sketch map among the embodiment one, and wherein Fig. 8 a is a structure chart, and Fig. 8 b is a left view, and Fig. 8 c is a right view;

Fig. 9 is for being the vertical section structure sketch map (being embodiment two) according to the another kind of syringe that technical theme of the present invention proposed;

Figure 10 is the structural representation of hook reservoir body among the embodiment two, and wherein Figure 10 a is a structure chart, and Figure 10 b is a left view, and Figure 10 c is a right view.

Embodiment

Referring to each figure, i.e. Fig. 3 to Fig. 5 and Fig. 9, the syringe with novel engaging self-distruction structure of the present invention includes syringe assembly 100, shank assembly 200 and needle stand assembly 300; This syringe assembly 100 comprises the syringe 110 with needle cylindrical unit 111 at least, have pilot hole 112 in the needle cylindrical unit bottom, shank assembly 200 is contained in the needle cylindrical unit 111, and this composition is similar to conventional injector, closely cooperate between the two, to reach the purpose that the medicinal liquid in the syringe is outwards injected; This needle stand assembly 300 is located by the bottom that pilot hole 112 is positioned in the needle cylindrical unit 111, and described needle stand assembly 300 has the medicine liquid channel hole 302 of perforation therein; Described shank assembly 200 includes shank 210, shank hook 220 and shank piston 230, and shank 210 links to each other with shank hook 220, and shank piston 230 is installed in shank 210 and links up with 220 junctions with shank.Described needle stand assembly 300 includes needle stand 310, needle stand piston 320 and hook reservoir body 330; This hook reservoir body 330 be inlaid in the needle stand piston 320 and be in of the cooperation of needle stand piston 320 forward needle stands 310 and firmly link to each other by interference, three are combined into one, this needle stand 310 is assemblied in the above-mentioned pilot hole 112.Between shank assembly 200 and needle stand assembly 300, have and one both are fastened togather, and can make needle stand assembly 300 engage self-distruction structure along what the syringe inwall in the syringe assembly 100 moved with shank assembly 200; By this engaging self-distruction structure can be firmly with contract needle cylindrical unit middle part to the syringe assembly of the needle stand assembly of used syringe, reaching the self-destruction purpose of protectiveness, anti-ly be utilized once more.Part among the present invention in the alleged engaging self-distruction structure general reference shank assembly can be fastened togather and drive all structures that the needle stand assembly slides with the needle stand assembly, and its hook portion 201 before by the shank assembly and the cavity volume portion 301 in the needle stand assembly constitute.Described hook portion 201 is the front portion hook of shank hook 220, this hook portion is made of head 2011 and waist 2012, greater than the waist height size, this hook portion is in outside the front surface of shank piston the outline height dimension of this head (relatively shown in the figure) after the installation; Described cavity volume portion 301 is in the needle stand assembly 300, and its shape matches with hook portion 201.

Described hook portion head 2011 is a triangle column body, and described hook portion waist 2012 is the rectangle column

Referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 9, described syringe assembly 100 also includes the weak destructible structure 130 of pin medicated cap 120 and connection syringe 110 and pin medicated cap 120 except that above-mentioned syringe 110.This pin medicated cap 120 is positioned on corresponding to being pilot hole 112 places on the needle cylindrical unit in 302 exits, the medicine liquid channel hole bottom by weak destructible structure 130; Its pin medicated cap 120 is a column, has in it to hold the circular slotted hole 121 that entry needle is installed head and entry needle, and the end has with entry needle uncovered that pilot hole 112 on needle cylindrical unit 111 bottoms that head locates matches is installed thereafter; The easily broken ring structure 130 of described weakness is a plurality of less joint pin 131 that pin medicated cap 120 connects the syringe bottom, and this joint pin reaches the purpose of the pin medicated cap that fractures easily along pin medicated cap wall uniform distribution when easy to use.Equally, above-mentioned entry needle can be one-body molded with needle stand 310; Above-mentioned pin medicated cap 120 also can one-body moldedly be made with syringe 110, and when molding, between constitutes a weak destructible structure 130, before using with its destruction and separate (belonging to destructive permanent the separation), to reach disposable purpose; Can have ribs 122 on the outer wall at pin medicated cap rear portion, the end has with entry needle uncovered that pilot hole 112 matches on needle cylindrical unit 111 bottoms at head or union joint place is installed thereafter.

Referring to Fig. 3 to Fig. 5 and Fig. 9, above-mentioned needle cylindrical unit 111 is the column of open tubular or interior sky for rear port, and its cross section of inboard wall is uniformly ellipse shape or similar ellipse (being made of four arcs) shape, and shown in Fig. 3 is elliptical shape.Have symmetrical hand rest 113 at open-mouth, easy to use.

Above-mentioned shank 210 includes shank body 211, place the outer and link 213 that be positioned at the handle 212 of shank body rear end and be in the shank front end of needle cylindrical unit to constitute; This handle 212 has symmetric flap, and is easy to use; Described shank body also has the elliptical flat-plate 214 that is horizontally placed between shank front end and the link, is convenient to more advantageously connect its link 213, to strengthen its intensity.Described elliptical flat-plate 214 is similar to the cross sectional shape of syringe inwall, and less than the sectional dimension of syringe inwall.

Referring to Fig. 3 to 5 and Fig. 9, the cross section of above-mentioned shank body 211 is symmetric " ten " font structures (Fig. 3), and it dwindles gradually near the handle place, and its physical dimension is less than the inwall size of needle cylindrical unit, and is easy to use; On shank body 211, has frangibility structure 215.The V font groove easy to break that this frangibility structure 215 is offered for suitable position on the shank body or the slotted eye (being V font groove shown in this figure) of other shape, its area accounts for 30%～80% of shank body 211 cross-sectional areas.So that after syringe uses up, twist into two parts this shank, reach the purpose of destructive protection.Frangibility structure shown in the figure is the V-notch of offering on four faces of shank body 211 center " ten " font structure, according to circumstances also can adopt other frangibility structure, the breach or the like that fractures of other shape that the suitable position that is the body of rod as its frangibility structure has.

Referring to Fig. 6, above-mentioned shank piston 230 is a column, it is that its shape of cross section is elliptical shape recited above or class ellipse (four arcs formation) shape that its outline and needle cylindrical unit inwall match, structure shown in the figure is: its body shape is similar to needle cylindrical unit cross section of inboard wall shape, at the profile circle that its body surfaces has an evagination, this profile circle and needle cylindrical unit inwall match.Have center cavity 231 at shank piston middle part, the front end face of this shank piston 230 has the groove 232 that connects with this cavity.Described cavity 231 can make the union joint 213 of shank body embed.In order to guarantee the fastness of its connection, the size of its cavity can be slightly less than the size of union joint.

Again referring to Fig. 3 to Fig. 5 and Fig. 9, described shank hook 220 is except that the hook portion 201 with front, the connecting portion 221 that links to each other with shank body link 213 that also has the rear portion, it is shank hook 220 that this connecting portion 221 constitutes an integral body by central catch 222 and hook portion 201, the size of described catch 222 is slightly larger than the size of above-mentioned shank pistion recess 232, can firmly it be embedded in the groove 232 during assembling.This connecting portion 221 and hook portion 201 lay respectively at the back (left side among Fig. 4) and the front of catch 224, and connecting portion 221 is positioned at the central authorities of catch 222.

Above-mentioned shank hook 220 is installed in shank 210 and the shank piston 230 by setting-in structure or sleeve structure.Link to each other by its firm over-surplus fit structure between shank 210 and the shank hook 220, with shank piston 230 and shank link up with 220 and shank 210 be connected as a single entity; Described link 213 is for having the rectangle column (shown in the figure) of internal cavities, also can be the column of other shape, described connecting portion 221 is the column that matches fully with the link internal cavities, and both closely link together by interference fit.

Referring to Fig. 3 to Fig. 5 and Fig. 9, described needle stand 310 is made of entry needle peace joint 311, needle stand union joint 312, conical card 313, catch 314, it is cylindric that this entry needle is installed head, be positioned at the front portion of needle stand, it links to each other with catch 314 by conical card 313, this taper shape card 313 is positioned at the middle part, and its shape pilot hole 112 big or small and with the syringe bottom matches, and promptly above-mentioned syringe pilot hole 112 is a round taper hole; This catch 314 can stretch out by the front of taper shape card the institute constitute, be used for the needle stand block in syringe, these catch 314 sizes are greater than pilot hole, to stop that needle stand skids off in the needle cylindrical unit 111 from pilot hole 112, union joint 312 is positioned at the rear portion of needle stand 310, be the column of rectangle or other shapes, this figure is depicted as the rectangle column, is used for coupling hook reservoir body 330.And match with the front end face groove 322 of needle stand piston;

Simultaneously referring to Fig. 7, above-mentioned hook reservoir body 330 is the column of T shape, be convenient to be inserted in the needle stand piston and do not skid off the needle stand piston, has an inverted T-shaped through hole in its column, it is made of neck aperture 331 and base apertures 332, through hole shown in this figure is that the cross section is orthogonal T shape hole, also can adopt other shape hole.

Described cavity volume portion 301 be the base apertures zone that surrounded by this neck aperture 331 and hook reservoir body and needle stand union joint constituted.The waist 2012 of the size of described neck aperture 331 and the degree of depth and hook portion matches, can make the hook portion head by force by after can not retreat, described base apertures 332 can be held the head 2011 of hook portion and be used to assemble needle stand union joint 312, its size satisfies the head requirement of hook portion, and promptly its size is identical to projection of shape with the hook portion head shaft; The size and the base apertures of described needle stand union joint match.

Referring to Fig. 8, above-mentioned needle stand piston 320 for the needle cylindrical unit inwall column that matches, have through hole in it, this through hole by with match rear orifice 321 and constitute of hook reservoir body with front hole 322 that the needle stand catch matches, the front and rear portions hole connects; Assembling aft hook reservoir body just embeds in the rear orifice 321, and same, the needle stand catch just embeds in the front hole, and the union joint 313 of needle stand links to each other with base apertures in the hook reservoir body by interference fit.

Above-mentioned needle stand 310 is assemblied in needle stand assembly 300 the function in the syringe assembly 100 except that having, and also has the effect that entry needle is installed concurrently, the entry needle installation of entry needle and needle stand 311 can be solidified togather man-hour adding.

Shank piston 230 in the above-mentioned shank assembly 200 matches with the inwall of needle cylindrical unit 111, and can form sealed slip along this inwall; Needle stand piston 320 in the above-mentioned needle stand assembly 300 also matches with the inwall of needle cylindrical unit 111.Be that described shank piston matches with needle stand piston external diameter and syringe internal diameter; Being elliptical shape or being similar elliptical shape (four arcs), is oval column shown in the figure.

Described engaging self-distruction structure is that shank hook 220 and hook reservoir body 330 also can comprise a kind of fit structure between the needle stand 310; This fit structure is cooperating between shank assembly 200 that has a hook portion 201 and the needle stand assembly 300 with the cavity volume portion 301 that holds this hook portion 201, so the shape of the structure of hook portion and cavity volume portion can be varied.

Medicine liquid channel hole 302 in the above-mentioned needle stand assembly 300 is the through hole at hook reservoir body 330 and needle stand 310 centers, promptly links up with the neck aperture of reservoir body and the centre bore of needle stand (end indicates among the figure).Rear surface by hook reservoir body 330 connects to the front surface of needle stand 310 always, and the front surface of needle stand 310 constitutes entry needle head is installed.

In the foregoing description, on the inwall of needle cylindrical unit open-mouth, have annular projection 114 and syringe inwall front portion, be positioned at the annular projection 114` at needle stand piston rear end face place; Annular projection 114 and 114` stop shank assembly 200 and needle stand assembly 300 accidents to withdraw from and the setback needle cylindrical unit.Annular projection 114 seamlessly transits from the needle cylindrical unit open-mouth and forms, and is convenient to the assembling of needle stand assembly etc.

The front portion hook of described shank hook 220 is that hook portion 201 is one.Two i.e. side by side a pair of also can be set.Again referring to Fig. 9 and Figure 10, described hook portion is side by side a pair of, and is distributed in symmetrically on the centrage of catch; Should have cavity volume portion to have two neck aperture 331 mutually, for easy to process, they are also with a base apertures 332.This neck aperture corresponds respectively to the head of hook portion.

The planform of the above-mentioned hook portion of mentioning is wherein a kind of just, according to circumstances also can adopt other planform, and as coniform drag hook or the like, shown in the figure is triangle column drag hook; The triangle column hook head portions of this hook portion is distributed in the catch axis and is on the end face at center and is symmetrical arranged.The lock that this hook portion (i.e. triangle column shown in the figure hook) also can be injection when finishing post-tensioning back stitching is ruined structure.The external diameter of above-mentioned shank piston center cavity appropriate section is slightly less than the external diameter of shank body link, can the shank body be embedded in the shank piston and with union joint and catch in the shank Hook by the external force suit firmly to install; The shank piston can adopt thermoplastic elastomer (s) to make; Its catch 224 firmly is installed in the shank piston to guarantee and to forge ties in pistion recess, and the hook portion in the shank hook is protruded the piston front.

After finishing injection, the shank piston is anterior to be touched with needle stand piston base close proximity, at this moment, the hook portion 201 of shank hook front end just in time enters in the cavity volume portion 301 in the shank body, because the hook portion head dimensions is greater than cavity volume portion neck aperture size, make hook portion can't break away from cavity volume portion, thereby shank assembly and needle stand assembly are fastened togather, when firmly pulling back shank, related the needle stand assembly together is pulled in the needle cylindrical unit, to reach self-destroyed syringe and to have stopped the exposed generation of accidentally injuring situations such as operator or recovery personnel outside of syringe needle.

The foregoing description is when assembling, earlier needle stand 310 is enclosed within needle stand piston 320 front portions, by hook reservoir body 330 connecting portion 331 of three by hook reservoir body 330 is connected with interference fit with union joint 314 on the needle stand 310 again and is assembled together, constitute needle stand assembly 300, be loaded to the bottom of needle cylindrical unit and needle stand 310 is cooperated with the pilot hole 112 of needle cylindrical unit bottom from needle cylindrical unit 111 open rearward end; Again shank hook 220 is inserted in the shank piston 230, makes the connecting portion and the shank piston corresponding matching of shank hook 220, combine by interference fit with shank body 210 again; Pack into till contacting by the open rearward end of needle cylindrical unit with the part of hook reservoir body 330 is tight.During use, separate needle cylindrical unit 110 earlier and extract medicinal liquid and liquid medicine injection with pin medicated cap 120 (belonging to destructive forever the separation) back, after finishing injection, the hook portion of shank hook 220 just in time closely contacts the neck aperture of hook reservoir body, and enter in the hook reservoir body by this hole by force, this moment, hook portion just in time tangled in the hook reservoir body, to hook portion must not be retreated to realize self-destroying function.To take out behind the shank then, simultaneously in the lump draw in needle stand, needle stand piston, hook reservoir body in syringe and with syringe needle assurance needle stand on can not accidentally injure operator and recovery personnel because hook portion is stuck and can not returns this moment.With the contrary shank that fractures of shank, carry out and reduce Biohazard Waste after shank is drawn back.

Claims (7)

1, the syringe that has novel engaging self-distruction structure includes syringe assembly (100), shank assembly (200) and needle stand assembly (300); This syringe assembly (100) comprises the syringe (110) with needle cylindrical unit (111) at least, has pilot hole (112) in the needle cylindrical unit bottom, shank assembly (200) is contained in the needle cylindrical unit (111), this needle stand assembly (300) is located by the bottom that pilot hole (112) is positioned in the needle cylindrical unit (111), and described needle stand assembly (300) has the medicine liquid channel hole (302) of perforation therein; Described shank assembly (200) includes shank (210), shank hook (220) and shank piston (230), and shank (210) links to each other with shank hook (220), and shank piston (230) is installed in shank (210) and shank hook (220) junction; Described needle stand assembly (300) includes needle stand (310), needle stand piston (320) and hook reservoir body (330); This hook reservoir body (330) be inlaid in the needle stand piston (320) and be in the cooperation of the forward needle stand of needle stand piston (320) (310) and firmly link to each other by interference, it is characterized in that: between shank assembly (200) and needle stand assembly (300), have and one both are fastened togather, and can make needle stand assembly (300) engage self-distruction structure along what needle cylindrical unit (111) inwall in the syringe assembly (100) moved with shank assembly (200); Hook portion (201) and the cavity volume portion (301) in needle stand assembly of this engaging self-distruction structure before by the shank assembly constitutes; Described hook portion (201) is the front portion hook of shank hook (220), this hook portion is made of head (2011) and waist (2012), the outline height dimension of this head is greater than the waist height size, described cavity volume portion (301) is in the needle stand assembly (300), and its shape matches with hook portion (201).

2, syringe according to claim 1 is characterized in that: above-mentioned needle cylindrical unit (111) is the column of open tubular or interior sky for rear port, and its cross section of inboard wall is that uniformly ellipse shape or similar elliptical shape promptly are made of four arcs; Shank piston (230) in the described shank assembly (200) matches with the inwall of needle cylindrical unit (111), and can form sealed slip along this inwall; Needle stand piston (320) in the described needle stand assembly (300) also matches with the inwall of needle cylindrical unit (111); Be that described shank piston matches with needle stand piston external diameter and syringe internal diameter; Be elliptical shape or promptly constitute by four arcs for similar elliptical shape.

3, syringe according to claim 1, it is characterized in that: described needle stand (310) is made of entry needle peace joint (311), needle stand union joint (312), conical card (313), catch (314), this union joint (312) is positioned at the rear portion of needle stand (310), is the column of rectangle or other shapes; Described hook reservoir body (330) is the column of T shape, has an inverted T-shaped through hole in its column, and this through hole is made of neck aperture (331) and base apertures (332); To be that the base apertures that surrounded by above-mentioned neck aperture (331) and hook reservoir body and needle stand union joint is regional constituted in described cavity volume portion (301); The waist (2012) of the size of described neck aperture (331) and the degree of depth and hook portion matches, and described base apertures (332) can be held the head (2011) of hook portion.

4, according to claim 1 or 3 described syringes, it is characterized in that: the front portion hook of described shank hook (220) is that hook portion (201) is one.

5, according to claim 1 or 3 described syringes, it is characterized in that: the front portion hook of described shank hook (220) is that hook portion (201) is side by side a pair of.

6, syringe according to claim 4 is characterized in that: described hook portion head (2011) is a triangle column body, and described hook portion waist (2012) is the rectangle column.

7, syringe according to claim 5 is characterized in that: described hook portion head (2011) is a triangle column body, and described hook portion waist (2012) is the rectangle column.

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