CN100522269C - Needle retraction type safety injector - Google Patents

Needle retraction type safety injector Download PDF

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Publication number
CN100522269C
CN100522269C CNB2006100529097A CN200610052909A CN100522269C CN 100522269 C CN100522269 C CN 100522269C CN B2006100529097 A CNB2006100529097 A CN B2006100529097A CN 200610052909 A CN200610052909 A CN 200610052909A CN 100522269 C CN100522269 C CN 100522269C
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China
Prior art keywords
elasticity
syringe
needle
forms
push rod
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Active
Application number
CNB2006100529097A
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Chinese (zh)
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CN1911467A (en
Inventor
林作钱
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI SOL-MILLENNIUM MEDICAL PRODUCTS Co Ltd
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Individual
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Priority to CNB2006100529097A priority Critical patent/CN100522269C/en
Publication of CN1911467A publication Critical patent/CN1911467A/en
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Publication of CN100522269C publication Critical patent/CN100522269C/en
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/32Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321Means for protection against accidental injuries by used needles
    • A61M5/322Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/315Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31501Means for blocking or restricting the movement of the rod or piston
    • A61M2005/31508Means for blocking or restricting the movement of the rod or piston provided on the piston-rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178Syringes
    • A61M5/31Details
    • A61M5/315Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31516Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery

Abstract

A high-safety injector with withdrawn needle is disclosed. The elastic supporting jaws with external convex step and supporting legs with flange at lower end are formed at lower end of elastic needle holder. The injection tube with internal slot matched with said convex step of supporting jaw. A supporting seat has the external convex step is contact with said supporting jaws, the internal upper flange matched with the flange of said supporting leg, and the lower supporting arm with elastic ratchets and close to said supporting leg. The fastening core has a conic table matched with said elastic ratchets.

Description

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.

Claims (9)

1, a kind of needle retractable safety injector, comprise a hollow barrel (1), push rod (2), plug (3), needle holder (4), elasticity connects needle stand (5), supporting seat (6), push rod (2) front end is provided with a 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), described elasticity connects needle stand (5) lower end and forms elasticity support claw (512) and feet (513), described elasticity support claw (512) outside forms the first boss rank (518), the outside, lower end of described feet (513) forms first flange (514), described syringe (1) inboard is provided with the groove (111) that matches with the first boss rank (518), form a frustum (811) that can fasten with elastic pawl (615) on the described the core of the card (8), it is characterized in that: described supporting seat (6) outside forms the second boss rank (612) that press mutually with elasticity support claw (512), inner top side forms second flange (611) that matches with first flange (514), the lower end forms the support arm (614) that fits with feet (513), form elastic pawl (615) on the support arm (614), the groove (111) of described syringe (1) has boss (112), and the outside molding of described supporting seat (6) lower end cooperates the 3rd spacing boss rank (613) with boss (112).
2, a kind of needle retractable safety injector as claimed in claim 1 is characterized in that: be provided with sealing device between described elasticity connection needle stand (5) and syringe (1).
3, a kind of needle retractable safety injector as claimed in claim 2, it is characterized in that: described sealing device, comprise that elasticity connects first circle (516) and sealing plug (7) that needle stand (5) is gone up molding, inboard, first circle (516) upper end forms sharp-pointed flange (517), sealing plug (7) outside forms support claw (711), the outside, lower end molding flange (712).
4, a kind of needle retractable safety injector as claimed in claim 2, it is characterized in that: described sealing device, comprise that elasticity connects second circle (5112) and sealing ring (5113) that needle stand (5) is gone up molding, sealing ring (5113) is installed between second circle (5112) and syringe (1) inwall.
5, a kind of needle retractable safety injector as claimed in claim 1 or 2 is characterized in that: described push rod (2) is provided with some easy breakpoints.
6, a kind of needle retractable safety injector as claimed in claim 1 or 2, it is characterized in that: described push rod (2) is provided with thrust brake, thrust brake comprises thrust block (211) and slide rail (212), have the chute (213) that slide rail (212) is installed in the thrust block (211), thrust block (211) lower end is extended with elasticity blocking bar (214), correspondingly push rod (2) lower end is provided with the first step (215) that fastens with elasticity blocking bar (214), and first step (215) is provided with second step (216).
7, a kind of needle retractable safety injector as claimed in claim 6, it is characterized in that: form the first inclined platform rank (219) on the described elasticity blocking bar (214), described syringe (1) inboard, lower end is provided with and cooperates the second spacing inclined platform rank (113) with the first inclined platform rank (219).
8, a kind of needle retractable safety injector as claimed in claim 6, it is characterized in that: the lower end of elasticity blocking bar (214) forms first inclined-plane (220), the terminal inboard of syringe (1) is provided with oblique groove (114), and oblique groove (114) forms second inclined-plane (115) that matches spacing with first inclined-plane (220) with syringe (1) inwall.
9, a kind of needle retractable safety injector as claimed in claim 1 or 2 is characterized in that: the quantity of described elasticity support claw (512) is at least two, and the quantity of described elastic pawl (615) is at least two.
CNB2006100529097A 2006-08-08 2006-08-08 Needle retraction type safety injector Active CN100522269C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006100529097A CN100522269C (en) 2006-08-08 2006-08-08 Needle retraction type safety injector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100529097A CN100522269C (en) 2006-08-08 2006-08-08 Needle retraction type safety injector

Publications (2)

Publication Number Publication Date
CN1911467A CN1911467A (en) 2007-02-14
CN100522269C true CN100522269C (en) 2009-08-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2594816C2 (en) * 2011-10-20 2016-08-20 Баодун БАЙ Self-destructing syringe with high level of safety and ease of assembly
RU169008U1 (en) * 2016-05-13 2017-03-01 Цзяньюй ЦЗЯ Retractable safety syringe with selective trigger

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201100133A (en) * 2009-06-26 2011-01-01 shu-ming Zhang Retraction device of safe syringe
CN201469833U (en) * 2009-07-30 2010-05-19 林作钱 Improved safety injector
CN101642593B (en) * 2009-08-31 2011-12-21 王兴章 Safety syringe capable of pulling back syringe needle
CN102813985B (en) * 2011-06-07 2016-09-21 王祖扬 Safety self-destruction syringe
EP2601992A1 (en) 2011-12-08 2013-06-12 Sanofi-Aventis Deutschland GmbH Syringe carrier
CN103638582B (en) * 2013-12-25 2015-09-30 徐雪花 The syndeton of needle holder and syringe in a kind of safety injector
TW201705994A (en) 2015-06-03 2017-02-16 賽諾菲阿凡提斯德意志有限公司 Autoinjector and method of assembling
TW201700117A (en) 2015-06-03 2017-01-01 賽諾菲阿凡提斯德意志有限公司 Syringe carrier for an autoinjector and method of assembling
CN107184397B (en) * 2017-07-18 2023-04-14 山西医科大学 Radiation-proof automatic radiopharmaceutical preparation injection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2594816C2 (en) * 2011-10-20 2016-08-20 Баодун БАЙ Self-destructing syringe with high level of safety and ease of assembly
RU169008U1 (en) * 2016-05-13 2017-03-01 Цзяньюй ЦЗЯ Retractable safety syringe with selective trigger

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Owner name: SHANGHAI MENGLI INTERNATIONAL TRADE CO., LTD.

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Address after: 200120 room 58, No. 2202 Liu long road, Shanghai, Pudong New Area

Patentee after: Shanghai Sol-Millennium Medical Products Co., Ltd.

Address before: 317513, Zhejiang City, Wenling Province town of stone industry zone launched Wenling plastic mold factory

Patentee before: Lin Zuoqian