CN202859789U - Medical safety syringe - Google Patents

Abstract

The utility model relates to a medical safety syringe which is composed of injection needle components, needle auto-recycling components and a syringe body. The medical safety syringe is characterized in that one pointed end of a recycling spring extends outward, the external diameter of the spring is larger than the diameter of an inner hole of a push rod, and the compressed spring and a latch are stopped by the front end of the inner hole of the push rod. A user pulls out the needle after injection and presses the push rod again to compress and deform a piston, the round edge at the front end of the latch pushes a damp ring forward, the damp ring is free from being inserted in a needle base, and thus the needle base is in an unbound state. The expansion part at the front end of the latch is embedded in an inner hole of the needle base, the pressure frees the latch from the limitation of the inner hole at the central front of the push rod, the spring is released and shoot out, the latch, an inner needle seat and the needle are injected to the back end of the inner hole of the push rod along the spring, and the needle is shielded completely. The pointed end of the steel spring which is close to the needle extends outward, when the spring moves toward the needle, the pointed end of the steel spring is embedded on the inner wall of the inner hole of the push rod, therefore, the latch is stopped, and the injection needle is limited and is not exposed. The needle seat and the needle auto-recycling device are separated, so the injection needle can be changed as needed before injection, and thus the medical safety syringe is convenient to use in clinic and easy to popularize.

Description

A kind of Medical safety syringe

(1), technical field

This utility model relates to a kind of medical apparatus and instruments, specifically a kind of for to the piercing process of tissue and after puncture to organizing administration or extracting a kind of Medical safety syringe of tissue specimen.

(2), background technology

Since the plastics disposable sterilized syringe has appearred in nineteen forties, because product can be reused, a large amount of propagation of blood borne disease have been caused thus, especially take acquired immune deficiency syndrome (AIDS), hepatitis C, hepatitis B as serious; World Health Organization (WHO) (WHO) in 1994 promotion is used: " disposable use self-destroyed syringe ", and how technical staff and enterprise prevent from having done a large amount of explorations aspect the reusing of syringe; But, medical personnel and patient's (cross-reference entry needle) are again punctured or stab cause because the basic reason that causes blood borne disease to propagate is injection needle at medical procedure, but not syringe itself; So WHO just proposed again in 1998: the requirement of " disposable use safety needle " requires technical staff and business research production " safety needle ", the pathophoresis that causes with thorough solution needle stick injury.The aid of syringe but be limited to entry needle, must cooperate with syringe (simultaneously) to use, and because the entry needle structure is too simple, realize that the safety self-destruct technical difficulty is larger, the technical staff is many to combine their (entry needle and syringes), studies, and makes it after common the use, interact, realize the purpose of self-destruction and security protection.

At present, the self-destroyed syringe of common various structures (active self-destruction formula or passive type self-destroyed) can only be realized unmaking of syringe on the market, 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 respectively two different products with disposable needle, respectively have (world) national standard to come standard; Syringe is a container and metering outfit; Entry needle then needs the professional and technical personnel to use or operates, puncture tissue, by the external passage of setting up an administration in the tissue or extracting specimen, and carry out the conveying of medicinal liquid or the collection of tissue specimen by passage; So.Entry needle is that a lancet device, its degree of risk are very high.

Mostly technical scheme in the world and domestic contrast maturation that entry needle can be shielded fully, present is: by effect artificial or machinery (spring) power, with entry needle income syringe or the push rod inner chamber after using, but all have certain deficiency:

1, the mode manually to draw injection needle to enter urceolus needs both hands to realize, has in operation the risk of self stabbing, and does not meet modern prevention standard and requirement: in realizing the syringe safe protection process, only allow one-handed performance.

2, in the mode of spring the automatic recovery injection needle: spring is positioned at the structure of needle stand position (main flow scheme both at home and abroad), so that retracting device and needle stand are integral structure, in a single day syringe dispatches from the factory, just can not again change syringe needle, also different to the requirement of entry needle simultaneously in clinical environment for use make troubles to user; 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 the test tube time, blood has started clotting mechanism, if at this moment 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 propagation and employment in clinical.

Chinese patent: CN92109192.3 has announced " a kind of disposable safety injector ", its technical characterictic is the structure that adopts the recovery syringe needle that Compress Spring separates with needle stand, its deficiency is utilize the different structure of plug and needle stand intermeshing, reach the locking of injector push-rod and the startup of security feature, nowadays, its scheme is also failed fine enforcement, because elastic piston mainly is sealing member, want it to bear chimeric triggering, positioning limiting fixator, be difficult to implement, nowadays the inventor also fails fine realization.

I Chinese patent: CN201020237543.2 (and relevant similar technical scheme) disclose a kind of before push rod inner chamber front end arranges plug and in the mode of its appearance suit Compress Spring, but syringe needle can be changed.The deficiency that exists is: rely on the sealing of sealing ring between entry needle needle stand and the outer hoop, need urceolus taper hole inwall projection mutually to support, the guarantee needle stand has certain non-return power (to keep needle point in piercing process, can freely not return and get loose), clinical middle requirement must not be less than 10N in the world for this power; So that the moment resilience force that spring triggers will substantially exceed this non-return power, also just require to be much higher than spring force to the locking force behind the spring-compressed (the static timeliness that keeps push rod, Compress Spring to be in after compression is winded up will keep more than 2 years).More than the last accumulative total of these technical parameters become: need a very large triggering power, just can overcome push rod to the locking force of spring force, could so that syringe obtains definite triggering, start security feature: the entry needle automatic retracted.This triggering (startup) power is large (being not less than 40N), so that this syringe (is slowly injected therapeutic process, needed at last to add the strength that several times are injected, could trigger in use procedure.For operation uncomfortable sensation is arranged.

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.

Also not seeing the technical scheme that can solve a kind of Medical safety syringe of above-mentioned deficiency fully both at home and abroad is disclosed.

Automatic clamped MULTIPLE COMPOSITE safeguard construction after a kind of Medical safety syringe of the present utility model has adopted the protection of entry needle the automatic recovery, needle stand support, spring to discharge; so that this programme rational in infrastructure, safe and reliable, meet China's clinical treatment working specification with the treatment code requirement; adapt to clinical various complicated environment for use; do not have limitation, the enforcement of use simple, be beneficial to universal.

(3), summary of the invention

This utility model provides a kind of a kind of Medical safety syringe that can solve above-mentioned deficiency.The technical solution of the utility model is such: a kind of Medical safety syringe is made of jointly needle assembly, injector assembly, entry needle the automatic recovery protector; It is characterized in that: entry needle the automatic recovery protector is comprised of spring, lock bolt, end plug and push rod; Needle assembly is made of jointly needle stand, needle tubing, damped ring, outer hoop; Injector assembly by urceolus, push rod, piston, form.

Spring is the forward disc spring, and an end gauage entire volume is bent, and the most advanced and sophisticated abduction of the steel wire head of the other end so that herein the spring race diameter greater than push rod central inner hole diameter, the internal diameter of spring greater than in the lock bolt, the external diameter at rear portion, but less than the external diameter of lock bolt rear end crimping.Spring steel wire abduction end is enclosed within the lock bolt periphery outside the entry needle direction, be installed in behind the rotary compression in the push rod central inner hole, and the diameter of the annular projection of push rod front end endoporus is slightly less than the diameter at lock bolt middle part.

Endoporus in outer cylinder front end has screw thread, and the rear end crimping of urceolus forms handle, in the bottom of handle, the barrel structure of extension is arranged, and its internal diameter is slightly larger than the diameter of pusher grip; The leading portion of urceolus has the termination, and the antetheca of termination is porose, and this aperture is slightly larger than the external diameter of needle stand leading portion; The length of urceolus leading portion is greater than more than two times of damped ring thickness, and the internal orifice dimension of urceolus leading portion is slightly less than the internal diameter of urceolus stage casing and back segment.

Outer hoop is medicated cap shape hollow structure, and the outer hoop appearance has screw thread; The leading portion of outer hoop is porose, the aperture is greater than the external diameter of needle stand leading portion, and in the outer hoop, back segment hollow, the stage casing internal orifice dimension of outer hoop is greater than the external diameter in needle stand stage casing, the internal diameter of the back segment endoporus of outer hoop is slightly less than the external diameter of damped ring, and the length of the endoporus of outer hoop back segment is greater than more than two times of damped ring thickness.

Damped ring is the ring that an elastomeric material is made, and its internal diameter is slightly less than the external diameter of needle stand hypomere; The external diameter of damped ring is slightly larger than the internal diameter of urceolus leading portion, also is slightly larger than the internal orifice dimension of outer hoop.

The front end of lock bolt be wedge shape expand outstanding, can be chimeric with the lower end endoporus annular projection of needle stand, the lower edge of lock bolt has the crimping of turning up, and carries a spring in order to holder.

Said a kind of Medical safety syringe, diameter of bore at the urceolus leading portion is slightly less than the urceolus internal diameter, the interior hole length of urceolus leading portion is greater than more than two times of damped ring thickness, the entry needle needle stand is installed in the endoporus of urceolus leading portion, closely cooperated by damped ring between endoporus inwall and the needle stand hypomere external diameter, damped ring forms sealing and build-in between outer tube inner wall and injecting needle base hypomere appearance, this build-in force (frictional resistance) is greater than 10N, to satisfy the non-return power requirement to entry needle; Said safety injector, when not using, its entry needle structure is not related with the entry needle automatic recycling device, so that this utility model can be changed entry needle before use with the need, for clinical use brings convenience.

Front inner wall at urceolus is shaped with spiral interface, and by the spiral interface sealing that can mutually spin with the external screw thread of the outer hoop of entry needle; The rear end abduction of urceolus consists of operating grip, and below handle, urceolus axially-extending certain-length consists of push rod is pressed concealing of handle.

The utlity model has following technical characterictic and technological progress:

Carry out routine operation during use, until puncture injection, treat successfully after, extract entry needle, push rod is pressed again, make lock bolt and needle stand chimeric, push rod front end annular wall moves forward damped ring, disengaging is to the build-in of needle stand, moves after making simultaneously lock bolt, and the restriction that breaks away from annular projection in the push rod front end endoporus is fastening, Compress Spring discharges, and the lock bolt resilience can enter the entry needle automatic drawing back push rod inner chamber and keep.

The automatic recovery injection needle assembly that is formed by spring, lock bolt, push rod inner chamber; be positioned at the front end of push rod centre bore; the most advanced and sophisticated abduction of its spring one end; spring at front end diameter after the abduction is greater than the push rod diameter of bore; so that the safety syringe has: entry needle automatic safety device volume is little, is hidden by piston, so that this product appearance is attractive in appearance; be as good as with ordinary syringe, be accepted use easilier.After injection for curing finishes, press again push rod and start safety device, can automatically entry needle be reclaimed into the inner shield of push rod endoporus and fix, can definitely effectively shield entry needle and needle point no longer exposes, thereby eliminate medical personnel by the risk of needle stick injury, avoided medical personnel and other staff to be injected pricking wound and cause and infect and pathophoresis.

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

(4), description of drawings

Fig. 1 is that the integral body of a kind of Medical safety syringe of this utility model consists of decomposing schematic representation;

Fig. 2 is urceolus and the entry needle member assembling structure sketch map of a kind of Medical safety syringe of this utility model;

Fig. 3 is the structural representation after the entry needle retracting device of a kind of Medical safety syringe of this utility model is installed;

Fig. 4 is the overall structure sketch map after a kind of Medical safety syringe assembling of this utility model, when to be used;

Fig. 5 be a kind of Medical safety syringe of this utility model after use, trigger the structural representation of state;

Fig. 6 be a kind of Medical safety syringe of this utility model after triggering, the entry needle the automatic recovery enters the push rod inner chamber and is in the structural representation of hold mode;

Fig. 7, be the outer tube structure sketch map of the second embodiment of a kind of Medical safety syringe of this utility model;

Fig. 8 is the structural representation after the urceolus of the second embodiment of a kind of Medical safety syringe of this utility model and entry needle, damped ring are installed;

(5), the specific embodiment

As shown in Figure 1, a kind of Medical safety syringe of this utility model by: outer hoop 10, needle tubing 1, needle stand 2, damped ring 3, urceolus 4, piston 5, push rod 6, spring 7, lock bolt 8, end plug 9, jointly form.Outer hoop 10, needle tubing 1, needle stand 2, damped ring 3 common needle assemblies; Needle tubing 1 front end has keen edge 1A; Damped ring 3 is made for elastic plastic material, and its endoporus is slightly less than the external diameter of needle stand hypomere 2C, the endoporus 10C diameter that its external diameter is slightly larger than the outer hoop back segment; Needle stand 2 centers are porose, its epimere 2A external diameter is slightly less than the endoporus 10A diameter of outer hoop 10 leading portions, needle stand 2 hypomere 2C hollows, and the inner edge of hollow has annular projection, the external diameter of needle stand hypomere 2C also is slightly larger than the internal diameter of damped ring 3 greater than the stage casing of needle stand and the external diameter of epimere 2A; The front end of urceolus 4 has spiral interface 4A, and in the rear end of urceolus, the operating grip 4B that has projection to form below handle, has a barrel structure 4C who prolongs; Piston 5 is ring bodies made from elastomeric material, and its endoporus and appearance can have several annular ditch grooves or as scheduled; The front end appearance of push rod 6 has a ring-shaped groove 6B, can with piston 5 endoporus match join chimeric; The front end of push rod 6 is porose, and its inwall has an annular projection 6A, and the push rod afterbody turns up to be expanded into and presses handle 6C, push rod hollow, the diameter of push rod leading portion endoporus less than in the push rod, the diameter of back segment endoporus, putting back-end has one with the expanded hole 6D of step, can with end plug 9 couplings; End plug 9 is circular blocks, and diameter is equal to or slightly less than the diameter of push rod lower end perforate 6D; Spring 7 one ends are the normal disk spring structure, and an other end steel wire head is abduction 7A then, and the diameter after the most advanced and sophisticated abduction of steel wire is greater than push rod 6 endoporus middle part diameter; Spring 7 is sleeved on the appearance of lock bolt 8, and be installed in front end in the push rod endoporus behind direction among the figure (towards the needle point direction) rotary compression, because spring is when rotary compression is installed, spring can be curling, make the reduced of abduction circle, be convenient to install less than the push rod diameter of bore.The front end of lock bolt 8 is by the fastening braking of annular projection 6A of the anterior endoporus of push rod, the lower end hollow of lock bolt 8, the outside turnup of lower edge limit 8B, its diameter greater than in the lock bolt, the epimere external diameter, also greater than the external diameter of spring 7.

Fig. 2 is urceolus and the entry needle member assembling structure sketch map of a kind of Medical safety syringe of this utility model; Outer hoop 10 screws among the female thread 4A of outer cylinder front end, mutually closely cooperates with its appearance screw thread 10B; The epimere 2A that is bonded with needle tubing 1, needle stand 2 in needle stand 2 endoporus is installed in the front aperture 10A of outer hoop, the hypomere 2C appearance suit damped ring 3 of needle stand 2, damped ring 3 is compressed to be installed among the endoporus 10C of outer hoop 10 hypomeres, forms closely chimericly with outer hoop 10, consists of needle assembly.

Fig. 3 is the structural representation of the entry needle retracting device (also being push-rod assembly) of a kind of Medical safety syringe of this utility model; As seen from the figure, be installed in the endoporus of push rod 6 front ends at the appearance suit Compress Spring 7 of lock bolt 8, the front end of lock bolt 8, by the annular projection 6A build-in of push rod front end 6 endoporus; The wedge shape of lock bolt 8 front ends is expanded the 8A of section and is protruded from push rod 6 front ends.Piston 5 is sleeved among the groove 6B of front end appearance of push rod 6; End plug 9 is installed among the endoporus 6D of push rod afterbody.

Fig. 4 is the overall structure sketch map after a kind of Medical safety syringe assembling of this utility model, when to be used; As seen from the figure, needle tubing 1 is bonded in the mesopore of needle stand 2, and the hypomere 2C of needle stand 2 is inlaid in by damped ring 3 among the endoporus 10C of outer hoop 10, and outer hoop 10 spins by external screw thread 10B and is fixed in the internal thread interface 4A of urceolus 4 front ends; Referring to Fig. 3, piston 5 is sleeved among the ring-shaped groove 6B of push rod 6 front end appearances, is tight slipper seal in the inner chamber of the urceolus 4 of packing into; Lock bolt 8 overcoats have spring 7, after spring 7 is compressed and lock bolt 8 together fastening by the annular projection 6A of push rod 6 front end endoporus; In the rear end of push rod 6, outwards crimping forms and presses handle 6C, among the expanded hole 6D of the end face of handle 6C, end cap 9 is housed.

Fig. 5 be a kind of Medical safety syringe of this utility model after use, be in the structural representation of triggering state; As seen from the figure, when injecting liquid drug or treatment finish, push rod 6 moves forward and needle stand 2 interacts, the wedge shape of lock bolt 8 is expanded the 8A of section and is goed deep in the lower end endoporus of needle stand 2, chimeric with needle stand 2 lower edge annular projections, along with the continuation of push rod 6 is goed deep into, the annular ancient piece of jade, round, flat and with a hole in its centre of push rod front end can with the stage casing 2B of damped ring 3 front passing to needle stand 2, be in free state because the overall diameter of needle stand 2 stage casing 2B less than the internal diameter of damped ring 3, makes needle stand 2 break away from damped ring 3; Along with to push rod 6 continue press, drive the continuation of lock bolt 8 deeply, because it is chimeric with needle stand 2 rear end endoporus annular projections that lock bolt 8 front ends expand the 8A of section, and needle stand 2 stage casing 2B external diameters can not move outward greater than outer hoop front end perforate 10A footpath, above-mentioned thrust reaction is in lock bolt 8, move after making lock bolt 8, relatively move with push rod 6 front end endoporus, moved, broken away from restriction and the build-in of annular projection 6A in the push rod front end endoporus behind the lock bolt 8; Finally cause between lock bolt 8 and the push rod 6 slippage with separate.

Fig. 6 be a kind of Medical safety syringe of this utility model after triggering, the entry needle the automatic recovery enters the push rod inner chamber and is in the structural representation of hold mode; In above-mentioned Fig. 5, along with the process of pressing of push rod 6, push away before making a push rod front end annular ancient piece of jade, round, flat and with a hole in its centre with damped ring, break away from the build-in to needle stand 2, and make fastening separation the between lock bolt 8 and the push rod 6; Because dissociating of lock bolt 8, spring 7 loses constraint, the elastic force abrupt release, can make lock bolt 8 drive needle stand 2, needle tubing 1 together by elastic force income push rod 6 inner chambers, because the elastic force of spring 7 is larger, speed is very fast, make spring 7 launch the rear end tails of push rod 6 near end plug 9, simultaneously also entry needle needle stand 2 and needle point 2 are regained shielding fully, needle point is no longer exposed, realize the purpose of security protection.Because spring 7 is after launching end, be in the rear end of push rod 6, stopped and to expose by end plug 9, also because the abduction circle 7A of spring 7 is released, its diameter is greater than the push rod diameter of bore, if needle stand moves to the push rod front end, then can make the most advanced and sophisticated 7A of spring 7 steel wires thrust or be embedded on the push rod 6 inner chamber tube walls, form and fix, make needle stand 2 and injection needle 1 be fixed on the rear end of push rod 6 inner chambers, and can not again expose.Simultaneously, the afterbody handle 6C of push rod 6 is in pushing the rear portion extension tube 4C of syringe urceolus 4 time, and handle 6C curved edges is flooded fully, and push rod 6 can not be pulled out again, thereby prevents that it is reused.

Fig. 7, be the outer tube structure sketch map of the second embodiment of a kind of Medical safety syringe of this utility model; As seen from the figure, the leading portion of urceolus has the termination 4D of a undergauge, termination hollow and urceolus UNICOM, and the internal diameter of termination is slightly larger than the external diameter of needle stand 2 stage casing 2B, and the front end of termination 4D has a perforate, and the perforate footpath is greater than the external diameter of the front end 2A of needle stand 2.The length of the endoporus of the leading portion 4E of urceolus is greater than more than 2 times of thickness of damped ring 3, and the internal diameter of the leading portion 4E of urceolus is slightly less than the internal diameter in urceolus stage casing; The outside crimping in the rear end of urceolus forms handle 4B, below handle, a barrel structure 4C who prolongs is arranged;

Fig. 8 is the structural representation after the urceolus of the second embodiment of a kind of Medical safety syringe of this utility model and needle stand, entry needle, damped ring are installed; The front end 2A of bonding needle tubing 1, needle stand 2 is installed in the front perforate of termination 4D of urceolus 4 leading portions in needle stand 2 endoporus, the back segment 2C appearance suit damped ring 3 of needle stand 2, damped ring 3 is compressed to be installed in the endoporus of urceolus leading portion 4E, forms closely chimeric with urceolus leading portion 4E inwall.

Because this utility model has adopted, damped ring in the process of push rod with its reach, only need to overcome the frictional force of its damped ring to the restriction of needle stand; Then, push rod pushes away before continuing, and can be realized definite triggering of the present utility model as long as can overcome front plug by the fastening force of push rod, starts spring and discharges.This triggering power (less than 20N) is far smaller than the in the past restriction of safety injector security feature tripping force (greater than 40N), can accomplish that low tripping force triggers, and is basically identical with the clinical injection operating physical force, uses comfortablely, meets the treatment operating routine.

Claims (8)

1. a Medical safety syringe is made of jointly needle assembly, injector assembly, entry needle the automatic recovery protection structure; It is characterized in that: entry needle the automatic recovery protector is comprised of with push rod (6) spring (7), lock bolt (8), end plug (9); Needle assembly is made of jointly needle stand (2), needle tubing (1), damped ring (3), outer hoop (10); Injector assembly by urceolus (4), push rod (6), piston (5), form.

2. said Medical safety syringe according to claim 1, it is characterized in that: spring (7) is the forward disc spring, one end gauage entire volume is bent, and most advanced and sophisticated (7A) abduction of the steel wire head of the other end, so that herein the spring race diameter greater than push rod (6) central inner hole diameter, the internal diameter of spring (7) greater than in the lock bolt (8), the external diameter at rear portion, but less than the external diameter of lock bolt rear end crimping.

3. said Medical safety syringe according to claim 1, it is characterized in that: spring (7) steel wire abduction end (7A) is enclosed within lock bolt (8) periphery outside the entry needle direction, be installed in behind the rotary compression in push rod (6) central inner hole, the diameter of the annular projection (6A) of push rod (6) front end endoporus is slightly less than the diameter at lock bolt (8) middle part.

4. said Medical safety syringe according to claim 1, it is characterized in that: the endoporus (4A) at urceolus (4) front end has screw thread, the rear end crimping of urceolus (4) forms handle (4B), bottom at handle, the barrel structure (4C) of extension is arranged, and its internal diameter is slightly larger than the diameter of push rod (6) handle (6C).

5. said Medical safety syringe according to claim 4, it is characterized in that: the leading portion of urceolus (4) has termination (4D), and the antetheca of termination is porose, and this aperture is slightly larger than the external diameter of needle stand (2) leading portion (2A); The length of urceolus leading portion (4E) is greater than more than two times of damped ring (3) thickness, and the internal orifice dimension of urceolus leading portion (4E) is slightly less than the internal diameter of urceolus stage casing and back segment.

6. said Medical safety syringe according to claim 1, it is characterized in that: outer hoop (10) is medicated cap shape hollow structure, outer hoop (10) appearance has screw thread (10B); The leading portion of outer hoop porose (10A), the aperture is greater than the external diameter of needle stand leading portion (2A), in the outer hoop, back segment hollow, the stage casing internal orifice dimension of outer hoop is greater than the external diameter of needle stand stage casing (2B), the internal diameter of the back segment endoporus (10C) of outer hoop is slightly less than the external diameter of damped ring (3), and the length of the endoporus (10C) of outer hoop (10) back segment is greater than more than two times of damped ring (3) thickness.

7. said Medical safety syringe according to claim 1, it is characterized in that: damped ring (3) is the ring that an elastomeric material is made, and its internal diameter is slightly less than the external diameter of needle stand hypomere (2C); The external diameter of damped ring (3) is slightly larger than the internal diameter of urceolus leading portion (4E), also is slightly larger than the endoporus (10C) of outer hoop (10) directly.

8. said Medical safety syringe according to claim 1, it is characterized in that: the front end of lock bolt (8) is wedge shape and expands outstanding (8A), can be chimeric with the lower end endoporus annular projection of needle stand (2), the lower edge of lock bolt (8) has the crimping of turning up (8B), carries spring (7) in order to holder.

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