A kind of needle retractable safety injector
Technical field
The present invention relates to a kind of injector for medical purpose, especially a kind of syringe needle can bounce back and pull out pin, uses the back syringe needle to conceal to be unlikely to expose the injector for medical purpose of hurting sb.'s feelings without the doctor.
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 syringe, after but injector to inject is intact, if syringe needle still is trapped in the syringe outside, destroy in the process at it and can stab the staff, thereby cause the secondary cross infection, in order to address the above problem, people developed multiple injection finish after the syringe of retractable needle to the syringe, wherein have to be no lack of the person of patenting, see all various safety injector patents, mostly be to be made as concavo-convex the cooperation between the front end of injector push-rod and needle holder, push rod be pushed into syringe after injection finishes foremost the time, push rod combines with needle holder, when push rod back during pull, needle holder and syringe head break away from, and needle holder contracts to syringe together with syringe needle, to prevent the needle sting people.But the syringe of this structure, push rod are with after needle holder combines, and push rod happens occasionally its reason with the situation that needle holder breaks away from again when pulling back: the one, because the concavo-convex fit structure between push rod and the needle holder is unreasonable; The 2nd, the power that disengaging need apply between needle holder and the syringe head is relatively large, and needle holder is difficult for drawing back; The 3rd, its required precision is higher, and mould is difficult to exploitation, is not easy to produce in batches.
Summary of the invention
Technical problem to be solved by this invention is: a kind of needle retractable safety injector is provided, and this syringe construction is reasonable, is easy to assembling, and needle holder is easy to draw back, and effectively avoids the generation of break-off between push rod and needle holder.
In order to solve the problems of the technologies described above, the present invention is by the following technical solutions: a kind of needle retractable safety injector, comprise that a hollow barrel, push rod, plug, needle holder, elasticity connect needle stand, supporting seat, the push rod front end is provided with a core of the card, needle holder is connected needle stand with elasticity and is connected, the resilient connection needle stand is spacing in the syringe upper end by supporting seat, it is characterized in that, described elasticity connects the needle stand lower end and forms elasticity support claw and feet, the described elasticity support claw outside forms the boss rank, and the outside, described feet lower end forms flange; Described syringe inboard is provided with the groove that matches with boss rank, the elasticity support claw outside; The described supporting seat outside forms the boss rank that press mutually with the elasticity support claw, and inner top side forms the flange that matches with feet lower end outboard flanges, and the lower end forms the support arm that fits with feet, forms elastic pawl on the support arm; Form a frustum that can fasten with elastic pawl on the described the core of the card.
By above technical scheme as can be known: on the one hand: needle holder of the present invention is connected needle stand with elasticity and is connected, the elasticity support claw on the elasticity connection needle stand and the groove of syringe fasten, the boss rank in the supporting seat outside press the elasticity support claw, when supporting seat moves downward with push rod, be easy to break away between elasticity connection needle stand and the syringe, thereby easily drive the needle holder retraction, the core of the card is firm with engaging of elastic pawl simultaneously, break-off can not take place; On the other hand: the present invention is rational in infrastructure, is easy to assembling, and mould is easy to exploitation, is convenient to produce in batches.
In order to solve the problems of the technologies described above, the present invention adopts following further technical scheme:
The groove of described syringe has boss, and the outside molding of described supporting seat lower end cooperates spacing boss rank with this boss.After adopting this structure, make supporting seat can be spacing better in the syringe upper end.
Be provided with sealing device between described elasticity connection needle stand and syringe.After adopting the sealing device, the syringe front end can be sealed better, prevent leak of liquid.
Described sealing device comprises that elasticity connects the circle and sealing plug of molding on the needle stand, and inboard, circle upper end forms sharp-pointed flange, and fluid sealant side beyond the Great Wall forms support claw, lower end outside molding flange.
Described sealing device comprises that elasticity connects the circle and the sealing ring of molding on the needle stand, and sealing ring is installed between circle and syringe inwall.
Described push rod is provided with some easy breakpoints.After being provided with easy breakpoint, when injection finishes rear push-rod backward during withdrawing, can breaking or fracture, reach the purpose of thorough self-destruction along described easy breakpoint.
Described push rod be provided with the thrust block device, thrust brake comprises thrust block and slide rail, has the chute that slide rail is installed in the thrust block, and the thrust block lower end is extended with elasticity blocking bar, correspondingly the push rod lower end is provided with the first step that fastens with elasticity blocking bar, and first step is provided with second step.This thrust block device can prevent the transportation and the drawing liquid body before because of maloperation, make syringe shift to an earlier date self-destruction.
Description of drawings
Fig. 1 is the cutaway view of unused state of the present invention;
Fig. 2 prepares the cutaway view of drawing liquid state for the present invention;
Fig. 3 is the cutaway view of beginning drawing liquid state;
Fig. 4 is the finish cutaway view of state of drawing liquid,
Fig. 5 pushes away the liquid cutaway view of state on earth;
Fig. 6 prepares the cutaway view of retracted state for syringe needle;
Fig. 7 is the cutaway view of needle retractable to the syringe internal state;
Fig. 8 is a cutaway view of finishing the self-destruction state;
Fig. 9 is Fig. 1 partial enlarged drawing;
Figure 10 is the cutaway view of syringe;
Figure 11 is the cutaway view of the resilient connection needle stand among the embodiment 1;
Figure 12 is the upward view of the resilient connection needle stand among the embodiment 1;
Figure 13 is the cutaway view of sealing plug;
The cutaway view of Figure 14 supporting seat;
The vertical view of Figure 15 supporting seat;
Figure 16 is the structural representation of push rod;
Figure 17 is the structural representation of thrust block;
Figure 18 is that the E-E of Figure 17 is to cutaway view;
Figure 19 is that the D-D of Figure 17 is to cutaway view
Figure 20 is the cutaway view of the syringe shown in the embodiment 2;
Figure 21 is the partial enlarged drawing of Figure 20;
Figure 22 is the cutaway view of the resilient connection needle stand among the embodiment 2;
The specific embodiment
Embodiment 1: referring to Fig. 1, shown in Figure 9: the present invention includes a hollow barrel 1, push rod 2, plug 3, needle holder 4, elasticity and connect needle stand 5, supporting seat 6, sealing plug 7, the core of the card 8, needle holder 4 is connected needle stand 5 and is connected with elasticity, resilient connection needle stand 5 is spacing in syringe 1 upper end by supporting seat 6
Referring to Figure 10, inboard, syringe 1 upper end is provided with a circle groove 111, and groove 111 has a circle boss 112, and inboard, syringe 1 lower end is provided with inclined platform rank 113, and syringe 1 terminal inboard is provided with oblique groove 114, and oblique groove 114 forms inclined-plane 115 with syringe 1 inwall.
Referring to Figure 11, Figure 12, resilient connection needle stand 5 is provided with the inner chamber 511 that injection passes through, the lower end forms elasticity support claw 512 and feet 513, described elasticity support claw 512 is at least two, elasticity support claw 512 outsides form boss rank 518, match with the groove 111 of syringe 1 in these boss rank 518, elasticity support claw 512 is snapped in the groove 111.The outside, lower end of feet 513 forms flange 514, and elasticity support claw 512 and lower surface, 513 junctions of feet are provided with groove 515, upper end surface molding one circle 516 of elasticity support claw 512, and inboard, circle 516 upper end forms sharp-pointed flange 517.
Referring to Figure 13, be provided with a sealing plug 7 between resilient connection needle stand 5 and syringe 1 inwall, sealing plug 7 outsides form support claw 711, support claw 711 is at least two, support claw 711 presses with syringe 1 inwall, and the outside, lower end forms flange 712, this flange 712 location of matching with sharp-pointed flange 517 on the elasticity connection needle stand 5, sealing plug 7 seals syringe 1 front end better, prevents leak of liquid.
Referring to Figure 14, Figure 15, inboard, supporting seat 6 upper end forms flange 611, this flange 611 is used for when lower slider matching spacing with the flange 514 in the outside, lower end of resilient connection needle stand 5 feets 513, the outside, middle part forms boss rank 612, these 612 outsides, boss rank press the elasticity support claw 512 on the resilient connection needle stand 5, elasticity support claw 512 is stuck in the groove 111 of syringe 1, outside molding boss rank, supporting seat 6 lower ends 613, circle flange 112 on these boss rank 613 and the syringe 1 location of matching, the inboard, lower end forms support arm 614, support arm 614 fits with feet 513 lower ends, form the elastic pawl of gathering to the center 615 on the support arm 614, described elastic pawl 615 is at least two.
Referring to Figure 16, push rod 2 front ends are provided with a core of the card 8, the core of the card 8 is injection molded into one with push rod 2 or flexibly connects with push rod 2, the core of the card 8 can stop up the inner chamber 511 of resilient connection needle stand 5, form a frustum 811 on the core of the card 8, and frustum 811 is arranged on position on the core of the card 8 and elastic pawl 615 positions on the supporting seat 6 adapt, when pushing away liquid forward, make frustum 811 pass elastic pawl 615 on the supporting seat 6, elastic pawl 615 props up frustum 811, and the core of the card 8 is stuck.
Push rod 2 is provided with some easy breakpoints, and present embodiment is provided with three easy breakpoint A, B, C, when injection finishes rear push-rod 2 backward during withdrawing, can break along described easy breakpoint, thereby described push rod 2 can't be reused, and reaches the purpose of thorough self-destruction.
Referring to Figure 16, Figure 17, Figure 18, Figure 19, push rod 2 is provided with a thrust brake, thrust brake comprises thrust block 211 and slide rail 212, slide rail 212 is located on the push rod 2, have the chute 213 that slide rail 212 is installed in the thrust block 211, thrust block 211 can move up and down along slide rail 212, thrust block 211 lower ends are extended with elasticity blocking bar 214, correspondingly push rod 2 lower ends are provided with the first step 215 that fastens with elasticity blocking bar 214, first step 215 is provided with second step 216, and form inclined-plane 217 and inclined-plane 218, form inclined platform rank 219 on the elasticity blocking bar 214, match spacing with the inclined platform rank 113 of inboard, syringe 1 lower end when these inclined platform rank 219 are used for push rod 2 pumpbacks, the lower end of elasticity blocking bar 214 forms inclined-plane 220 and inclined-plane 221, inclined-plane 220 matches with the inclined-plane 115 of syringe 1 lower end, inclined-plane 221 matches with inclined-plane 217 on the push rod 2, the lower surface of elasticity blocking bar 214 and first step 215 upper surfaces are butt mutually, this moment is spacing with push rod 2, push rod 2 can not be pushed ahead, can only pumpback, can prevent from before transportation and drawing liquid body, to push described elastic pawl 615, make syringe shift to an earlier date self-destruction because of maloperation misses described the core of the card 8.When extracting liquid pumpback push rod 2, butt is spacing mutually on the inclined platform rank 113 of the inclined platform rank 219 on the elasticity blocking bar 214 and syringe 1 inboard, 212 of thrust block 211 and slide rails produce relative motion, thrust block 211 is relative to moving forward with push rod 2, elasticity blocking bar 214 breaks away from first step 215, fall into second step 216,214 inclined platform rank 219 are separated with the inclined platform rank 113 of syringe 1 inboard on the elasticity blocking this moment bar, and push rod 2 is forward impelling easily.
As Fig. 1,2,3,4,5,6,7 and shown in Figure 8, be the overall process of the present invention's use.Wherein Fig. 1 is the cutaway view of unused state, this moment, the core of the card 8 did not pass the elastic pawl 615 on the supporting seat 6, fasten on elasticity blocking bar 214 on the thrust brake and the push rod 2 simultaneously, push rod 2 is propped up, Fig. 2 is for preparing the cutaway view of drawing liquid state, push rod 2 pumpbacks this moment, butt is spacing mutually on the inclined platform rank 113 of the inclined platform rank 219 on the elasticity blocking bar 214 and syringe 1 inboard, Fig. 3 is the cutaway view of beginning drawing liquid state, elasticity blocking this moment bar 214 breaks away from first step 215, begin to fall into second step 216, Fig. 4 is the finish cutaway view of state of drawing liquid, and elasticity blocking this moment bar 214 falls into second step 216 fully, and Fig. 5 pushes away the liquid cutaway view of state on earth, the frustum 811 of the core of the card 8 passes the elastic pawl 615 on the supporting seat 6 at this moment, elastic pawl 615 is stuck with the core of the card 8, hinders the core of the card 8 pumpbacks, and the core of the card 8 stops up inner chamber 511, can not reuse, finish the self-destruction first step.Fig. 6 prepares the cutaway view of retracted state for syringe needle; This moment, the core of the card 8 drive supporting seats 6 were toward swivel motions, butt is spacing mutually for flange 514 outside the flange 611 of the inboard molding in supporting seat 6 upper ends and the lower end of feet 513, elasticity support claw 512 falls in the groove of 612 upper ends, boss rank on the supporting seat 6 simultaneously, break away from the groove 111 of syringe 1 inwall, for needle retractable is prepared, Fig. 7 is the cutaway view of needle retractable to the syringe internal state; Fig. 8 finishes the cutaway view of self-destruction state, and this moment, push rod 2 certainly easy breakpoint places broke, and made push rod 2 heads, broke and can't come out in syringe 1, reached thorough self-destruction.
Embodiment 2:
Referring to Figure 20, Figure 21, Figure 22, provided the resilient connection needle stand 5 of another kind of structure in the present embodiment, this resilient connection needle stand 5 is basic identical with the structure of the resilient connection needle stand 5 shown in the embodiment 1, difference is: elasticity support claw 512 and upper surface, 513 junctions of feet are provided with a circle 5112, correspondingly are provided with a sealing ring 5113 between circle 5112 outsides and syringe 1 inwall.
Other structure is identical with embodiment 1 in the present embodiment.