CN201469833U

CN201469833U - Improved safety injector

Info

Publication number: CN201469833U
Application number: CN2009201903293U
Authority: CN
Inventors: 林作钱
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-30
Filing date: 2009-07-30
Publication date: 2010-05-19
Anticipated expiration: 2019-07-30
Also published as: WO2011012014A1

Abstract

The utility model relates to an improved safety injector, comprising a hollow needle cylinder, a push rod, a rubber plug and a needle bed, a locking ring movably matched with the inner wall of the needle cylinder is arranged below the needle bed, a cone-shaped table is formed at the front end of the push rod, at least two elastic supporting claws are arranged at the lower end of the needle bed, a groove of the elastic supporting claw is arranged on the inner wall of the needle cylinder correspondingly, the elastic supporting claws are contacted with the outer wall of the locking ring in a pressing way, at least two convex plates are arranged at the lower end of the needle bed, circular beads matched with the convex plates are arranged on the inner wall of the needle cylinder correspondingly, a first elastic pawl clamped with the cone-shaped table is arranged in an inner hole of the locking ring, after the injection is carried out, the cone-shaped table at the front end of the push rod is clamped with the first elastic pawl in the locking ring, the push rod is pulled downwards to drive the locking ring to slide downwards, so as to separate the needle bed and the inner wall of the needle cylinder. By adopting the structure of the injector, as the convex plates are arranged on the needle bed and are matched with the circular beads on the needle cylinder wall, after the injection is carried out, the needle bed can not be pushed outside the needle cylinder under the action of pushing force, and the residual injection fluid in the needle cylinder is less after the injection is finished.

Description

A kind of improved safety injector

Technical field

This utility model belongs to a kind of medical apparatus, belongs to a kind of safe self-breaking syringe particularly.

Background technology

Syringe is that an indispensable apparatus is gone up in medical treatment, for avoiding the blood cross infection, present syringe all adopts disposable product, but this disposable syringe, if inartificial damages, can reuse, cause cross infection in order not make existing disposable syringe be repeated to utilize, spread disease, have many syringes just to arise at the historic moment.Such as the pull-back safety injector, when push rod retracted, entry needle was followed up in the syringe, but when promoted by external force, syringe needle can come out, and also can cause cross infection.Also have a kind of pull-back safety injector 200410017938.0, when retracting push rod, entry needle and then enters in the syringe, syringe needle can be difficult for pulling out, but needle point be sharp tiltedly on one side, plastic needle cylinder is generally made of common PP, material is very soft, and under the effect of external force, needle tubing easily is punctured, needle point can be exposed, also can cause cross infection,, just adopt following three kinds of methods in conjunction with on probation: 1. increase the syringe wall thickness for safety.2. in the PP raw material, add and increase the steel agent.3. select inflexible needle tubing, so just increased cost, reduced the sharpness of needle tubing, brought misery to patient.On push rod, be provided with damaged part in addition, after finishing, injection firmly push rod is fractureed, destroy push rod, reach self-destruction, though this class syringe push rod is destroyed, but still can continue to use after changing push rod, can not reach the purpose of overall safety, this class syringe is drawing liquid (blood) secondary piston front end (being that piston is not pulled to the end) not on zero line in addition, so during drawing liquid (especially in blood drawing) uses, causes drawing liquid (blood) dosage nonstandard on the one hand, make that on the other hand the air in the syringe was residual not more when syringe used, also have on this class syringe needle boss is not set, can not prevent effectively that injection from finishing after, needle stand is gone out outside the syringe.

Summary of the invention

The technical problems to be solved in the utility model is: a kind of improved safety injector is provided.Needle stand can not gone out outside the syringe after this injector to inject finished.

In order to solve the problems of the technologies described above, this utility model by the following technical solutions:

A kind of improved safety injector, comprise a hollow barrel, one push rod that in syringe, slides, be installed in the plug of push rod front end, the syringe front end is equipped with the needle stand that can break away from syringe, needle stand below be provided with one with syringe inwall lock ring movingly, the push rod front end forms frustum, it is characterized in that: described needle stand lower end is provided with at least two elasticity support claws, correspondingly the syringe inwall is provided with the groove that the elasticity support claw snaps in, the lock ring outer wall presses the elasticity support claw, the needle stand lower end also is provided with at least two boss, correspondingly the syringe inwall is provided with the shoulder that cooperates with boss, the lock ring endoporus is provided with first elastic pawl that can fasten with frustum, and after injection finished, intra-annular first elastic pawl of the frustum of push rod front end and locking fastened, following pulling-pushing rod drives lock ring and glides, and needle stand and syringe inwall are broken away from.

Form cannular boss in the hollow cavity of described plug, push rod is provided with block, block is positioned at the below of cannular boss, block and cannular boss bottom offset, plug is subjected to the counteracting force of injection generation and the thrust compressive deformation of block during injection, this moment the push rod front end frustum along axially the protracting of push rod, the injection back frustum that finishes can engage with first elastic pawl.

Described push rod is provided with round platform, round platform is provided with second elastic pawl that extends to syringe inwall oblique angle, the end of syringe is provided with diameter-increasing portion, transition position in non-diameter-increasing portion of syringe and diameter-increasing portion is provided with the sloping platform rank, second groove that second elastic pawl can snap in when below, sloping platform rank was provided with down pulling-pushing rod is provided with the back-up ring that can prop up the round platform bottom in the diameter-increasing portion.

Described back-up ring and syringe end diameter augmenting portion inwall are moving joins, can be along axially the moving up and down and do not deviate from syringe of push rod, and the back-up ring upper end is provided with the elasticity support claw of the propped up round platform bottom of gathering to the center.

At least two of quantity of described second elastic pawl and being symmetrical arranged, the distance between the symmetric two pawl points are less than the internal diameter of the non-diameter-increasing portion of syringe, greater than the minimum diameter at place, sloping platform rank in the syringe.

Described second groove is a circle draw-in groove, and its upper surface is from inside to outside and along oblique angle or plane that the second elastic pawl cephalad direction is extended, and its side-walls diameter is greater than the distance between the symmetrical two ratchet points.

Adopt the syringe of said structure, because needle stand is provided with boss, boss matches with shoulder on the needle cylinder wall, needle stand can not gone out outside the syringe under the effect of thrust after injection finished, lock ring and needle stand fastened after injection finished, and lock ring drives needle stand and moves downward, because needle stand lower end elasticity support claw has inside movement tendency under the effect of elastic force, just can make the disengaging of needle stand and syringe inwall so apply less pulling force, reach the purpose of needle retractable to the syringe.The end of syringe is provided with diameter-increasing portion, self-locking mechanism can be arranged on back end of syringe, push rod is provided with elastic pawl and extends to the syringe inwall, elastic pawl snaps in groove during following pulling-pushing rod, stop push rod to move upward, the bottom that the back-up ring of elastic pawl below props up the push rod round platform stops push rod to move downward, because the effect elastic pawl of groove can not move in radial direction, reaches the purpose of locked push rod.Piston nose (piston is pulled to the end) on zero line is without hindrance not unimpeded in the drawing liquid final vacuum when injecting, and the residual quantity of injection is less in the syringe of injection back.

Description of drawings

Fig. 1 is for push rod installs, the cutaway view of unused state;

Fig. 2 is the cutaway view of drawing liquid state;

Fig. 3 is for injecting the cutaway view of the state that finishes;

Fig. 4 is the cutaway view of needle retractable shape;

Fig. 5 is the finish cutaway view of state of self-destruction;

Fig. 6 is the structural representation of push rod;

Fig. 7 is the cutaway view of syringe;

Fig. 8 is the cutaway view of the B of Fig. 7 to view;

Fig. 9 is that the A-A of Fig. 7 is to cutaway view;

Figure 10 is the cutaway view of needle stand;

Figure 11 is the cutaway view of the C of Figure 10 to view;

Figure 12 is the vertical view of figure needle stand;

Figure 13 is the cutaway view of back-up ring;

Figure 14 is the cutaway view of lock ring;

Figure 15 is the vertical view of lock ring;

Figure 16 is the structural representation of plug;

Figure 17 is the partial enlarged drawing of Fig. 1;

Figure 18 is the partial enlarged drawing of Fig. 5;

Figure 19 is the partial enlarged drawing of Fig. 7;

Figure 20 is the partial enlarged drawing of Fig. 4.

The specific embodiment

Referring to Fig. 1, Fig. 2, a kind of safety injector, comprise the push rod 2 that a hollow barrel 1, slides, the plug 3 that is installed in push rod 2 front ends in syringe 1, the front end of syringe 1 is equipped with the needle stand 4 that can break away from syringe, needle holder 5 is installed on the needle stand 4, for guaranteeing sealing between needle stand 4 and the syringe 1, injection does not leak during injection, between needle stand 4 and the syringe 1 O RunddichtringO 41 is installed.

Referring to Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 14, Figure 15, Figure 17, needle stand 4 lower ends are provided with at least two elasticity support claw 6 (see figure 6)s, correspondingly the syringe inwall is provided with groove 611 (see figure 7)s that elasticity support claw 6 snaps in, liquid body pressure when injection, for anti-needle stand 4 is gone out outside the syringe 1, needle stand 4 lower ends are provided with at least two boss 612 (seeing Figure 11), and correspondingly the syringe inwall is provided with shoulder 613 (see figure 8)s that cooperate with boss.Needle stand 4 belows be provided with one with syringe 1 inwall lock ring 7 (seeing Figure 20) movingly, the lock ring outer wall presses elasticity support claw 6, make it spacing in groove 611, needle stand 4 is fixing, push rod 2 front ends form frustum 211 (see figure 6)s, lock ring 7 endoporus are provided with and can (see Figure 14 with first elastic pawl 8 that frustum 211 fastens, Figure 15), at least two of the quantity of first elastic pawl 8, after injection finishes, the frustum 211 of push rod front end and first elastic pawl 8 in the lock ring 7 fasten, elastic pawl 8 props up the lower surface of frustum 211, following pulling-pushing rod drives lock ring 7 and glides, elasticity support claw 6 ejects from groove 611 under the effect of self elastic force, and needle stand 4 and syringe inwall are broken away from.

Referring to Figure 16, Figure 20, form cannular boss 311 in the hollow cavity of plug 3, push rod 2 is provided with block 212 (see figure 6)s, and block 212 is positioned at the below of cannular boss 311, and block 212 offsets with cannular boss 311 bottoms.Plug 3 is subjected to the counteracting force that injection produces and the thrust compressive deformation of block 212 during injection, this moment the push rod front end frustum 211 along axially the protracting of push rod, the injection back frustum 211 that finishes can engage with first elastic pawl 8.The below that is positioned at plug 3 on the push rod 2 is provided with round platform 19 (see figure 6)s, and the ratchet point that round platform 19 is provided with second elastic pawl, 20, the second elastic pawls 20 that extend to syringe inwall oblique angle rises on the extreme direction oblique angle before syringe.Referring to Figure 19, the end of syringe is provided with diameter-increasing portion 21, transition position in non-diameter-increasing portion 22 of syringe and diameter-increasing portion 21 is provided with sloping platform rank 23, the groove 24 that elastic pawl 20 can snap in when 23 belows, sloping platform rank were provided with down pulling-pushing rod, be provided with the back-up ring 25 (seeing Figure 18) that can prop up round platform 19 bottoms in the diameter-increasing portion 21, back-up ring 25 upper ends are provided with the elasticity support claw 26 (referring to Figure 13) of propped up round platform 19 bottoms of gathering to the center.The external diameter of round platform 19 is positioned at the minimum diameter at elasticity support claw 26 pawls point place smaller or equal to the minimum diameter on syringe sloping platform rank 23 greater than back-up ring 25.At least two of quantity of elastic pawl 20 and being symmetrical arranged are preferably four and be to be symmetrical arranged, and the distance between the symmetric two pawl points is less than the internal diameter of the non-diameter-increasing portion 22 of syringe, greater than the minimum diameter on sloping platform rank 23 in the syringe.

Referring to Figure 19, groove 24 is circle draw-in grooves along the circumferential direction, and its upper surface 91 is from inside to outside and along oblique angle or plane that elastic pawl 20 cephalad direction are extended, and its sidewall 92 place's diameters are greater than the distance between the symmetrical elastic pawl 20 pawl points.Back-up ring 25 is joined with syringe end diameter augmenting portion 21 inwalls are moving, can move up and down vertically, and do not deviate from syringe, its distance that moves adds the distance of top cylinder sloping platform rank 23 length greater than tip to round platform 19 bottoms of the elastic pawl on the push rod 2 20, and back-up ring 25 upper ends can prop up round platform 19 bottoms.Round platform 19 can be entered the big extruding of elasticity support claw 26 supports of back-up ring 25.The inwall of syringe end diameter augmenting portion 21 is provided with and back-up ring 25 moving circle big grooves 61 (referring to Fig. 7) of joining, on it top 62 can with back-up ring 25 upper ends 121 butts, be provided with flange step 28 in big groove 61 lower ends, the outer ring of back-up ring 25 upper ends is provided with flange 29 (referring to Figure 13), bottom face 122 butts of flange step 28 and flange 29, step 28 stop the slippage in the syringe of these back-up rings 25.

Referring to Figure 18, after injection finishes, pulling push rod 2 moves to the syringe bottom direction, the top of the elasticity support claw 26 of the back-up ring 25 that is installed in syringe 1 inside will be run in the baseplane of the round platform 19 on the push rod 2, therefore the internal diameter of locating is less than the external diameter of round platform 19, thereby driving back-up ring 25 moves downward, pull on push rod 2 downwards, elastic pawl 20 contacts with sloping platform rank 23 upper inclined surface 81 (referring to Figure 19), and under these inclined-plane 81 effects, central part direction to push rod produces strain, and moving down and cross the minimum place of internal diameter on sloping platform rank 23 with push rod, elastic pawl 20 is after crossing the minimum place of sloping platform rank 23 internal diameters, by self elastic return to former naturalness, the pawl point of elastic pawl 20 will snap in the groove 24 of 23 belows, sloping platform rank, when push rod 2 continues down to move, the bottom face 122 of back-up ring 25 upper end flange 29 and syringe end diameter increase inwall flange step 28 butts of part 21, stop push rod to move downward, if certain external force is arranged when injection direction promotes push rod, because elastic pawl 20 plays interception under the effect of groove 24, the sidewall 92 of groove 24 can prevent the direction upset of elastic pawl to needle cylinder wall, reaches the purpose of locked push rod.

This utility model in use, at first, as shown in Figure 1, this is a user mode, elastic pawl 20 enters the non-diameter-increasing portion 22 of syringe by sloping platform rank 23 smoothly under the effect of back-up ring 25, round platform 19 also enters the non-diameter-increasing portion 22 of syringe to the big extruding of support claw 26 supports of back-up ring 25, and as shown in Figure 2, this is the drawing liquid state; As shown in Figure 3, this moment, injection finished; Because of the inertia of thrust continues to push against forward push rod 2 at this moment, plug 3 is subjected to the counteracting force of injection generation and the thrust compressive deformation of block 212, this moment the push rod front end frustum 211 axially protracting along push rod, as shown in Figure 4, the push rod of pulling back downwards, frustum 211 engages with first elastic pawl 8 on the lock ring 7, continuing down, pulling-pushing rod drives lock ring 7 downslides, needle stand 4 breaks away from the syringe inwall, as shown in Figure 5, continues to pull down push rod, drive needle holder retraction, second elastic pawl 20 is 23 downslides along the sloping platform rank, and this moment, elastic pawl 20 snapped in the groove 24 of 23 belows, sloping platform rank, and push rod 2 is by locked, push rod is provided with damaged part, firmly push rod is fractureed after injection finishes, destroy push rod, self-destruction is finished.

Claims

1. improved safety injector, comprise a hollow barrel (1), one push rod (2) that in syringe (1), slides, be installed in the plug (3) of push rod (2) front end, the syringe front end is equipped with the needle stand (4) that can break away from syringe, needle stand (4) below be provided with one with syringe inwall lock ring (7) movingly, the push rod front end forms frustum (211), it is characterized in that: described needle stand (4) lower end is provided with at least two elasticity support claws (6), correspondingly the syringe inwall is provided with the groove (611) that elasticity support claw (6) snaps in, the lock ring outer wall presses elasticity support claw (6), needle stand (4) lower end also is provided with at least two boss (612), correspondingly the syringe inwall is provided with the shoulder (613) that cooperates with boss (612), lock ring (7) endoporus is provided with first elastic pawl (8) that can fasten with frustum (211), after injection finishes, first elastic pawl (8) in frustum of push rod front end (211) and the lock ring (7) fastens, following pulling-pushing rod drives lock ring (7) and glides, and needle stand and syringe inwall are broken away from.

2. a kind of according to claim 1 improved safety injector, it is characterized in that: form cannular boss (311) in the hollow cavity of described plug, push rod is provided with block (212), block (212) is positioned at the below of cannular boss (311), block (212) offsets with cannular boss (311) bottom, plug during injection (3) is subjected to the counteracting force of injection generation and the thrust compressive deformation of block (212), this moment the push rod front end frustum (211) along axially the protracting of push rod, the injection back frustum (211) that finishes can engage with first elastic pawl (8).

3. improved as claimed in claim 1 or 2 a kind of safety injector, it is characterized in that: described push rod (2) is provided with round platform (19), round platform (19) is provided with second elastic pawl (20) that extends to syringe inwall oblique angle, the end of syringe is provided with diameter-increasing portion (21), transition position in non-diameter-increasing portion of syringe (22) and diameter-increasing portion (21) is provided with sloping platform rank (23), second groove (24) that second elastic pawl (20) can snap in when below, sloping platform rank (23) was provided with down pulling-pushing rod is provided with the back-up ring (25) that can prop up round platform (19) bottom in the diameter-increasing portion (21).

4. as a kind of improved safety injector as described in the claim 3, it is characterized in that: described back-up ring (25) is joined with syringe end diameter augmenting portion (21) inwall is moving, can be along axially the moving up and down and do not deviate from syringe of push rod, back-up ring (25) upper end is provided with the elasticity support claw (26) of propped up round platform (19) bottom of gathering to the center.

5. a kind of improved safety injector as claimed in claim 3, it is characterized in that: at least two of the quantity of described second elastic pawl (20) and being symmetrical arranged, distance between the symmetric two pawl points is less than the internal diameter of the non-diameter-increasing portion of syringe (22), the minimum diameter of locating greater than sloping platform rank (23) in the syringe.

6. as a kind of improved safety injector as described in the claim 3, it is characterized in that: described second groove (24) is a circle draw-in groove, its upper surface (91) is from inside to outside and along oblique angle or plane that the second elastic pawl cephalad direction is extended, and its sidewall (92) is located diameter greater than the distance between the symmetrical two ratchet points.