CN201701572U

CN201701572U - Medical safety syringe

Info

Publication number: CN201701572U
Application number: CN2010202375432U
Authority: CN
Inventors: 张亚平
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-24
Filing date: 2010-06-24
Publication date: 2011-01-12
Anticipated expiration: 2020-06-24
Also published as: WO2011160445A1

Abstract

A medical safety syringe comprises an injection needle, an automatic return component, a needle tip and edge positioning structure and a syringe, and is characterized in that one tip end of a return spring extends outwards so that the outer diameter of a ring of the tip end is larger than the inner aperture of a push rod, the compressed spring and a latch are braked by the front end of an inner hole of the push rod, after the needle is pulled out prior to injection, the piston can be compressed to deform by repressing the push rod, the annular edge of the front end of the latch cuts a support plate on the inner wall of a central hole of the front end of an outer cylinder to release support of an inner needle seat, an expanded part of the front end of the latch is in embedded fit with an annular projection of the inner hole of the inner needle seat, pressing can release the latch from limitation of the inner hole at the center of the front end of the push rod, the spring ejects to drive the latch, the inner needle seat and the needle tip to return to the rear end of the inner hole of the push rod so that the needle tip is completely shielded, a steel wire tip of the spring close to the needle tip extends outwards, the spring moves towards the needle tip, and the steel wire tip can be embedded into the lateral wall of the inner hole of the push rod to brake the latch so that the injection needle tip is limited and cannot be released to be exposed. The upper half of the inner needle seat is square, a square hole is arranged at the front end of an outer needle seat, and the square upper haft and the square hole form the needle tip and edge positioning structure. The structure of the needle seat separated from the needle tip automatic return device allows the injection needle of the syringe to be replaceable according to needs. The characteristics bring convenience for clinical use and facilitate popularization of the syringe.

Description

The medical safe syringe

Technical field

This utility model relates to a kind of medical apparatus and instruments, a kind of specifically medical safe syringe that is used for tissue penetration process and puncture back administration thereof or extracts tissue specimen.

Background technology

Since plastics system disposable sterilized syringe occurring the forties in last century, because technology (structure) reason can be reused product, brought a large amount of propagation of blood borne disease thus, serve as serious with acquired immune deficiency syndrome (AIDS), hepatitis C, hepatitis B especially; The World Health Organization (WHO) in 1994 advocates and uses: " disposable use self-destroyed syringe ", and how technical staff and enterprise just prevent from, forbid to have done a large amount of explorations aspect the repeated use of syringe; But, because the basic reason that causes blood borne disease to propagate is that injection needle is in medical treatment

Process is stabbed once more medical personnel and patient (intersect and use entry needle) and is caused, but not syringe itself; So WHO just proposed again in 1998: the requirement of " disposable injection needle safe in utilization ", technical staff and business research production " safety needle ", cause the problem of basic propagation with thorough solution needle stick injury.

At present, the self-destroyed syringe of the various structures of usually seeing on the market (active self-destruction formula or passive type self-destroyed), it can only realize unmaking of syringe, and it can not be reused, and but can not carry out security protection and unmakes entry needle; We know that disposable syringe belongs to two different products respectively with disposable needle, respectively have (world) national standard to come standard; Syringe is a container and metering outfit; Entry needle then is a lancet device, needs under the prerequisite of certain technology, sets up the passage of administration or extraction specimen, and carries out the conveying of medicinal liquid or the collection of tissue specimen by passage, and its degree of risk is very high.

The technical scheme of the world and domestic comparative maturity is at present: by the effect of artificial or spring force, the entry needle withdrawal after using is entered in syringe or the push rod inner core space, its method is more, but all has certain deficiency:

1, manually to retract the mode of syringe needle, need both hands to realize, in operation, there is the risk of self stabbing, do not meet modern prevention standard and requirement: in realizing the syringe safe protection process, only allow one-handed performance.

2, reclaim the mode of injection needle automatically with spring: spring is positioned at the structure of needle stand position (main flow scheme both at home and abroad), make retracting device and needle stand be integral structure, in a single day syringe dispatches from the factory, just can not change syringe needle once more, also different to the requirement of entry needle simultaneously in clinical environment for use make troubles to user; Moreover: because needle tubing once is fixed in the needle stand in process of production; the needle stand random installation is in the spring protection device; the needle point edge direction can not be adjusted once more; after producing end; make that the needle point edge direction can not consistent with syringe urceolus containing mark (same plane); medical personnel are in clinical manipulation; when especially puncturing inserting needle in the blood vessel; need cutting edge upwards; be convenient to skin and blood vessel inserting needle; in case behind the intravasation, when the medicinal liquid of injection doses, need to observe graduation mark; and this moment; because edge direction may be opposing with graduation mark, just rotary injection device once more just can be seen graduation mark; this process is very easy to cause needle point to puncture the vascularization seepage or needle point pierces through out blood vessel, makes puncture failure.Entry needle also has: owing to can not be changed, in the state of emergency such as ambulatory environment, just can not use this syringe collecting blood sample, because the existence of blood blood clotting mechanism is easy during blood drawing, but to shift specimen in test tube the time, blood has started clotting mechanism, at this moment if force from entry needle, blood preparation to be migrated out, will cause a large amount of fragmentations of hemocyte, make the testing result deviation distortion.So all there is wretched insufficiency in the automatic or manual safety injector that reclaims of syringe needle in the market, has restricted its popularization and application in clinical.

Chinese patent: CN92109192.3 has announced " a kind of disposable safety injector ", its technical characterictic is the structure that adopts compression spring and the isolating recovery syringe needle of needle stand, it is insufficient to utilize the different structure of plug and being meshing with each other of needle stand, the locking and the security feature that reach injector push-rod are to start, nowadays, its scheme is also failed fine enforcement, because elastic piston mainly is a sealing member, want it to bear chimeric triggering, positioning limiting fixator, the real difficulty that belongs to, nowadays utility model people also fails fine realization.

Chinese patent: CN200710031083.0 (and relevant similar technical scheme) disclose a kind of the push rod inner chamber is provided with an end plug outside suit compress the mode of spring, basic technical features and above-mentioned identical, certain improvement is arranged, syringe needle can be changed, but the deficiency that exists is that the needle point cutting edge can not be fixed, and is in free position.Can not finely satisfy clinical user demand, act on behalf of hidden danger to the operator.All there is certain deficiency in the technical scheme of above-described various safety injectors, makes product have limitation in clinical practice, can not be popularized.

At present, also not seeing the technical scheme that can solve above-mentioned insufficient medical safe syringe fully both at home and abroad is disclosed.

Medical safe syringe of the present utility model has adopted entry needle to reclaim protection, needle point cutting edge location, needle stand support, spring release back clamped MULTIPLE COMPOSITE safeguard construction automatically automatically; make that this programme is rational in infrastructure, safe and reliable, meet China's clinical treatment working specification and therapeutic process requirement; adapt to clinical various complicated environment for use; do not have limitation, the enforcement of use simple, be beneficial to universal.

The utility model content

This utility model provides a kind of can solve above-mentioned insufficient medical safe syringe.The technical solution of the utility model is such: reclaim the protection structure automatically by needle assembly, injector assembly, the spacing location structure of entry needle cutting edge, entry needle and form jointly.It is characterized in that: entry needle reclaims the protection structure automatically to be made up of lock bolt, recovery spring and push rod, and spring is the forward disc spring, and an end gauage is whole to curl, and the other end is the most advanced and sophisticated abduction of steel wire head then, makes that the spring race diameter is greater than push rod central bore diameter herein; Spring steel wire abduction end is towards the entry needle direction, and spring overcoat is installed in the push rod central bore after the rotation compression (spring front end abduction loop diameter is diminished) in the lock bolt periphery, and the annular projection at lock bolt middle part is by the fastening braking of a push rod front end endoporus ancient piece of jade, round, flat and with a hole in its centre; When not starting, they are static to be installed in the central space of push rod front end, puncturing successfully, injection or collection treatment finish, extract entry needle, after the observation needle point is complete, push push rod once more, make piston distortion compression, lock bolt front end ring edge cutting needle seat supports sheet makes needle stand lose support simultaneously, it is chimeric that lock bolt front end center wedge shape is expanded portion and needle stand endoporus annular projection, continue to push, power makes the restriction of lock bolt disengaging push rod front end central bore, under the effect of spring force, lock bolt is rapidly with needle stand, needle point is recovered to the rear end of push rod central bore, makes the complete conductively-closed of needle point; Because the special construction of spring: it can only be ejected along the direction that discharges, after it ejects fully, because of the most advanced and sophisticated abduction of the nearly needle point one end steel wire of spring, make this coil spring diameter greater than push rod central bore footpath, if spring moves to the push rod front end, push rod endoporus sidewall will be thrust or embed in the spring steel wire tip, makes the spring can not move left and right, makes the injection needle point spacing and can not deviate to expose once more.

Said entry needle positioning limit structure is to be cooperatively interacted by the interior needle stand that the outer needle stand with square hole and the first half are the square body to finish.In process of production, the interior needle stand of needle point cutting edge and square body front end is unified the location, in installation process,, also just can guarantee to inject the system of needle point edge direction because outer needle stand has square hole.Said medical safe syringe, at the outer cylinder front end centre bore at inboard basilar part, be shaped on four lamellar kicks, the weakness that is connected of its basilar part and center bore inner wall, it is outstanding to constitute base of a fruit shape, constitute the support of internal needle stand, this support force requires to get final product to the puncture force of organizing to satisfy needle point, generally is not more than 10N; Said safety injector, when not using, its entry needle structure is not related with the entry needle automatic recycling device, makes this utility model can change entry needle before use with the need, for clinical use brings convenience.

Said medical safe syringe, its injector assembly is made up of urceolus, push rod and end cap and piston; Piston is inlaid in the push rod front end, and interference fit and outer tube inner wall are slipper seal again; Spiral interface in the upper end system standard Luer structure of urceolus, and centre bore by spiral interface and outer tube inner chamber UNICOM, the lower end abduction formation operating grip of urceolus is below handle, urceolus axially-extending certain-length constitutes the sheath of concealing that push rod is pushed handle; Piston center is porose, and a plurality of annular grooves are arranged in the hole, with push rod front end exterior annular projection tabling, in the interior outside of the first half of piston annular groove is arranged all, is convenient to piston under external force pressure, can produce the radial compression distortion; Said needle assembly is made of jointly sealing ring, needle tip shield between needle tubing, interior needle stand, outer needle stand, the inside and outside needle stand; Interior needle stand has bonding needle tubing in through hole, the hole, the interior needle stand first half outside to be square column type, Lower Half hollow, and there is annular constriction projection the lower edge inboard; Outer needle stand lower end endoporus is standard 6% tapered hole, mates with outer cylinder front end standard Luer spiral interface; The depths of outer needle stand lower end endoporus settle sealing ring and with interior needle stand tight seal, outer needle stand lower end outer rim has Rule structure, the upper end of outer needle stand is a square inner bore, matches with interior needle stand front end.

The utlity model has following technical characterictic and technological progress:

Because safety injector of the present utility model is not when using, entry needle is installed in the spiral interface of syringe front end; Take off needle tip shield during use, carry out routine operation, after treating puncture injection, treating successfully, extract entry needle, push rod is pushed once more, make lock bolt and interior needle stand chimeric, cutter pin seat supports limb, start safety device, trigger the compression spring and discharge, the lock bolt resilience can enter the entry needle automatic drawing back push rod endoporus and keep.This case is easy to manufacture, and is safe and reliable, implement simply, not limited by environment for use, widely applicable, is beneficial to universal.

Owing to adopted the automatic recovery entry needle structure of forming by spring, lock bolt, push rod endoporus; this device is positioned at the front end of push rod centre bore; the most advanced and sophisticated abduction of its spring one end; spring point diameter after the abduction is greater than the push rod diameter of bore; make the safety syringe have: entry needle automatic safety device volume is little, is hidden by piston, makes this product appearance attractive in appearance; be as good as more acceptant use with ordinary syringe.To needle point spacing, the location is definite, be convenient to operation.After injection for curing finishes, push push rod again and start safety device, can automatically entry needle be reclaimed into push rod endoporus inner shield and fix, do not expose, security protection is reliable.

Because the structure that this utility model has adopted automatic recovery needle point and effectively continued to keep, in use, but definite effective shielding entry needle and needle point, thereby avoid the nurse by the risk of pricking wound, avoided medical personnel and other people member to be stabbed and cause and infect and the danger of pathophoresis by entry needle.

Because this utility model has adopted injecting needle base and pin automatic recycling device separated structures, the replaceable entry needle of safety injector that makes the present technique proposition, it no longer is limited making range of application, is convenient to penetration and promotion.

Description of drawings

Fig. 1 is that the integral body of this utility model medical safe syringe is formed decomposing schematic representation;

Fig. 2 is the outer needle stand structural representation of this utility model medical safe syringe;

Fig. 3 is the interior needle stand structural representation of this utility model medical safe syringe;

Fig. 4 is that the automatic recovery structure of injecting needle base supporting construction, needle point of this utility model medical safe syringe concerns sketch map;

Fig. 5 is the structural representation of the lock bolt of this utility model medical safe syringe;

Fig. 6 is that this utility model medical safe syringe is reclaiming the spring structure sketch map;

Fig. 7, the 8th, this utility model medical safe syringe are when injection for curing finishes, move structural representation with the needle stand interaction process with the entry needle push rod;

Fig. 9 is that the entry needle of this utility model medical safe syringe reclaims the structural representation that enters the push rod inner chamber and be in hold mode automatically;

Specific embodiment

As shown in Figure 1, this utility model medical safe syringe by: needle tip shield 0, outer needle stand 1, needle tubing 2, sealing ring 3, interior needle stand 4, piston 5, spring 6, lock bolt 7, end plug 8, push rod 9, urceolus 10 are formed jointly.Sheath 0, outer needle stand 1, needle tubing 2, sealing ring 3, interior needle stand 4 common needle assemblies; Sheath 0 is sleeved on the appearance of outer needle stand 1 when flat, the protection needle point is avoided collsion damage, and needle tubing 2 front ends have keen edge 2a; Sealing ring 3 is made for elastic plastic material, plays friction sealed effect between inside and outside needle stand; Interior needle stand 4 centers are porose, can bonding needle tubing 2 in the hole, the Lower Half hollow of interior needle stand 4, the lower end inner edge has annular projection, interior needle stand first half outer rim is square, and cooperates with outer needle stand 1 upper end square hole, in the centre bore in needle point is bonded on the needle stand, interior needle stand is installed in the outer needle stand by the sealing ring frictional fit, constitutes needle assembly of the present utility model; The front end of urceolus 10 has Rule spiral interface 10a, the porose 10b in center to be communicated with outer tube inner chamber, in the rear end of urceolus, has projection to form operating grip 10d, below handle, a barrel structure 10e who prolongs is arranged; The front end of push rod 9 has several annular projections 9a, can match chimeric with several annular grooves of piston 5 inside; The afterbody of push rod 9 turn up enlarge become curved surface shaped push handle 9b, push rod hollow, anterior diameter of bore is less than the postmedian diameter of bore, there is an expanded hole 9c who has step the rear end, can with end plug 8 couplings; Spring 6 one ends are the normal disk spring structure, and an other end steel wire head is abduction 6a then, and diameter is greater than push rod 9 endoporus middle part diameter after the most advanced and sophisticated abduction of steel wire; Spring 6 is sleeved on lock bolt 7 appearances, and be installed in front end in the push rod endoporus after direction among the figure (towards the needle point direction) the rotation compression, the middle part annular projection 7b of lock bolt 7 is by the fastening braking of the anterior endoporus sidewall of push rod, and the wedge shape of lock bolt 7 front ends is expanded the 7a of portion and protruded in push rod 9 front ends.After lock bolt 7 installs, end plug 8 shutoff in the afterbody expanded hole 9c of push rod 9.

Fig. 2 is the outer needle stand 1 of this utility model medical safe syringe, outer needle stand 1 lower end outer rim Rule structural protrusions 1c, and the lower end endoporus is standard 6% a tapering circular hole, there is annular groove 1b the circular hole depths, to hold sealing ring 3; There is square hole 1a the upper end of outer needle stand 1, is communicated with the lower end circular hole; Outer needle stand 1 can spin fixing with the female Luer of syringe outer cylinder front end.

Fig. 3 is the interior needle stand 4 of this utility model medical safe syringe, the interior needle stand porose 4a in 4 centers, lower end hollow, the lower end inner edge has annular projection 4b, the interior needle stand first half outer rim 4c that is square, cooperate assembling with outer needle stand 1 upper end square hole 1a, in needle tubing 2 is bonded in the centre bore 4a of needle stand 4 front ends, the friction of interior needle stand 4 by sealing ring 3 is installed in that mutual group becomes needle assembly of the present utility model in the outer needle stand.

Fig. 4 is the structural representation after the needle assembly of this utility model medical safe syringe is installed in the urceolus female Luer: interior needle stand 4 is assembled in the outer needle stand 1 by sealing ring 3, spin with urceolus 10 front end female Luer 10a by outer needle stand 1 then and be fixed on the front end of syringe urceolus 10, lower end at interior needle stand 4, the bottom inner edge that is urceolus conehead endoporus 10b has at least four small pieces to be base of a fruit shape projection 10c, internally needle stand 4 supports, to keep the firm of needle stand, provide certain puncture force, not loosening slippage in urceolus 10 of needle stand 4 in making; As shown in Figure 4, piston 5 is chimeric to be sleeved on the annular projection of push rod 9 front ends, is installed in the outer tube inner chamber of syringe and is tight slipper seal; Be with springs 6 outside the lock bolt 7, together be fastened on the front end of push rod 9 central bore after spring 6 is compressed with lock bolt 7 by push rod 9 front end endoporus sidewalls by the annular projection 7b at lock bolt middle part; In the rear end of push rod 9, outwards crimping forms and injects handle 9b, and the outer rim of handle 9b is circular arc spherical surface (curved surface), in the expanded hole of handle 9c end face, is equipped with end cap 8.

Fig. 5 is lock bolt 7 structural representations of this utility model medical safe syringe, at the front end of lock bolt 7, the 7a of the portion of expanding of a projection is arranged, and its center has the slit, and the distortion that is beneficial to interior needle stand 4 lower end endoporus when chimeric is inserted; At the front outer of lock bolt 7, circular sharpened edge 7d is arranged, at the periphery first half of lock bolt 7, an annular projection 7b is arranged, it directly is slightly larger than push rod front end diameter of bore.The lower end hollow of lock bolt 7, the oriented crimping 7c that turns up of lower edge, but bearing spring 6.

Fig. 6 is the structural representation of the recovery spring of this utility model medical safe syringe, spring 6 is the conventional disc spring of forward, but at the one end, the steel wire pitch enlarges gradually, steel wire front end 6a abduction, the outmost turns diameter of spring abduction are greater than push rod 9 diameter of bores (φ Td 〉=φ Q; See Fig. 5); Spring is enclosed within the periphery of lock bolt 7 and is rotated towards the direction of (near entry needle) by the abduction tip and is compressed in assembling in the push rod.Because when spring was installed in the rotation compression, spring can curl, and makes the reduced of abduction circle, was convenient to install less than the push rod diameter of bore.

Fig. 7, Fig. 8 be this utility model medical safe syringe injection for curing when finishing, injector push-rod moves and the structural representation of needle stand interaction process; In Fig. 7, as can be known, when injecting liquid drug when finishing, the lock bolt wedge shape expand the 7a of portion deeply in the lower end endoporus of needle stand 4, chimeric with interior needle stand 4 lower edge annular projection 4b, along with push rod continues deeply, the annular sharpened edge 7d of lock bolt 7 front end peripheries moves forward, four base of a fruit shape support chip 10c on the urceolus 10 front end centre bore lower edge inwalls are cut, and needle stand 4 loses support in making; Along with to push rod 9 continue push, the continuation that drives lock bolt 7 is goed deep into, because it is chimeric with interior needle stand 4 rear end endoporus annular projection 4b that lock bolt 7 front ends expand the 7a of portion, and interior needle stand 4 has square column body 4c to be fixed in the square hole 1a of outer needle stand 1, and outer needle stand 1 is screwed among the front end female Luer 10a of urceolus 10 not removable; The continuing of push rod 9 pushed, certainly will cause between lock bolt 7 and the push rod 9 relative slippage with separate.

Fig. 9 is that the entry needle of this utility model medical safe syringe reclaims the structural representation that enters the push rod inner chamber and be in hold mode automatically; In above-mentioned Fig. 7, Fig. 8, along with pushing in the process of push rod 9, the front end of piston 5 is owing to exist

annular groove

5a, 5b on the structure, under certain pressure under the condition: such as injection finish the back to syringe unmake and brute force when exciting security feature is pushed push rod 9, piston 6 front ends distortion can occur and shrink, as Fig. 9, making push rod reach has enough spaces to go deep into conehead endoporus 10b with bolt 7, because of the Incoercibility of interior needle stand 4 with lock bolt 7, continue to push push rod 9, must make fastening separation the between lock bolt 7 and the push rod.Because dissociating of lock bolt 7, spring 6 loses constraint, the elastic force abrupt release, can make the interior needle stand 4 of lock bolt 7 drives, needle tubing 2 together are recovered to the push rod inner chamber by elasticity rapidly, because the elastic force of spring 6 is very big, speed is very fast, make spring 6 launch the rear end tails of push rod 9 near end plug 8, simultaneously also needle stand in the entry needle 4 and needle point 2 are regained shielding fully, needle point is no longer exposed, realize the purpose of security protection.Because spring 6 is after launching end, be in the rear end of push rod 9, stopped and to expose by end plug 8, also because the abduction circle 6a of spring 6 is released, its diameter is greater than push rod diameter of bore (φ Td 〉=φ Q), if move to the push rod front end, then can make the most advanced and sophisticated 6a of steel wire thrust or be embedded on the push rod 9 inner chamber tube walls, form and fix, needle stand 4 and injection needle 2 are fixed on the rear end of push rod 9 inner chambers in making, and can not expose once more.Simultaneously, the afterbody handle 9b of push rod 9 is circular arc camber, and in the time of in the rear portion that pushes syringe urceolus 10 prolongs pipe 10e, the handle curved edges is flooded fully, and push rod can not be pulled out once more, thereby realizes disposable restriction.

Claims

1. a medical safe syringe reclaims the protection structure automatically by needle assembly, injector assembly, the spacing location structure of entry needle cutting edge, entry needle and forms jointly; It is characterized in that: entry needle reclaims the protection structure automatically and is made up of with push rod (9) lock bolt (7), spring (6); Again

Needle assembly is made of jointly sheath (0), outer needle stand (1), needle tubing (2), sealing ring (3), interior needle stand (4); Again

Injector assembly is made up of urceolus (10), push rod (9), piston (5), end plug (8); Again

Needle point cutting edge location structure is by square body (4c) formation of square hole (1a) with interior needle stand (4) first half of outer needle stand (1) front end.

2. according to the said medical safe syringe of claim 1, it is characterized in that: spring (6) is the forward disc spring, and an end gauage is whole to curl, and steel wire head tip (6a) abduction of the other end, make that the spring race diameter is greater than push rod (9) central bore diameter, i.e. φ Td 〉=φ Q herein.

3. according to the said medical safe syringe of claim 1, it is characterized in that: spring (6) steel wire abduction end (6a) is enclosed within lock bolt (7) periphery outside the entry needle direction, be installed in push rod (9) central bore after the rotation compression, annular projection (7b) diameter at lock bolt (7) middle part is a bit larger tham push rod (9) front end diameter of bore.

4. according to the said medical safe syringe of claim 1, it is characterized in that:, be shaped on four base of a fruit shapes kick (10c) in urceolus (10) front end centre bore (10b) basilar part inboard.

5. according to the said medical safe syringe of claim 1, it is characterized in that: the front end of outer needle stand (1) has square hole (1a), the first half of interior needle stand (4) body (4c) that is square.

6. according to the said medical safe syringe of claim 1, it is characterized in that: urceolus (10) is to turn up and constitute handle (10d) in the rear end, and handle, at its lower end has the tubular (10e) of prolongation vertically..

7. according to the said medical safe syringe of claim 1, it is characterized in that: piston (5) center is porose, a plurality of annular grooves are arranged in the hole,, annular groove (5a, 5b) is all arranged in the interior outside of the first half of piston (5) with push rod (9) front end exterior annular projection (9a) tabling.

8. according to the said medical safe syringe of claim 1, it is characterized in that: the front end of lock bolt (7) is wedge shape and expands protuberance (7a), and chimeric with lower end endoporus annular projection (4b) of interior needle stand (4), the lower edge of lock bolt (7) has the crimping of turning up (7c).