CN201578701U - Self-destroy type injector with retractable needle head - Google Patents
Self-destroy type injector with retractable needle head Download PDFInfo
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- CN201578701U CN201578701U CN2009202181307U CN200920218130U CN201578701U CN 201578701 U CN201578701 U CN 201578701U CN 2009202181307 U CN2009202181307 U CN 2009202181307U CN 200920218130 U CN200920218130 U CN 200920218130U CN 201578701 U CN201578701 U CN 201578701U
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- injection
- needle holder
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- injection rod
- needle
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- 238000002347 injection Methods 0.000 claims abstract description 118
- 239000007924 injection Substances 0.000 claims abstract description 118
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 9
- 230000009471 action Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000003612 virological effect Effects 0.000 description 1
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Abstract
The utility model provides a self-destroy type injector with a retractable needle head, which belongs to the technical field of medical appliances. The self-destroy type injector with the retractable needle head solves the problem that existing self-destroy type injectors have bad injection effect, high assembly difficulty and high production cost. The self-destroy type injector comprises an injection tube and an injection bar in the injection tube, a needle head holder which can be used for a needle head to be fixed and is provided with a liquid through hole is arranged inside the front end of the injection tube, a front locating mechanism for preventing the needle head holder from moving forward axially to be separated from the injection tube is arranged between the needle head holder and the injection tube, a rod head for integrally connecting the injection rod with the needle head holder is arranged at the front end of the injection rod, a rear locating mechanism for preventing the needle head holder from moving backward axially is arranged between the rear end of the needle head holder and the injection tube, when the injection rod and the needle head holder are connected and the injection rod moves backwards axially, and the rear locating mechanism can be invalid under the inclination acting force of the injection rod, thereby enabling the injection rod to drive the needle head holder to move backward axially. The self-destroy type injector has high working stability, convenient and smooth use, and saves labor in operation.
Description
Technical field
This utility model belongs to technical field of medical instruments, relates to the self-destruction syringe of a kind of syringe, particularly a kind of retractable needle.
Background technology
Cause viral cross infection for fear of using antihygienic syringe, disposable syringe is widely used in medical field.Can only not use the technical measures that once and not are reused but common disposable syringe does not have, make secondary to occur free can the boring of the not really regular individual medical clinic of some medical institutions, particularly minority and use, even the phenomenon that is repeatedly used.For this reason, many people have proposed various disposable syringes with self-destroying function, but a lot of syringe can not really be accomplished complete self-destruction.Though some has realized self-destruction, after finishing using, its syringe needle still is retained on the original position, and the medical worker is stabbed by sharp syringe needle when compiling easily, must be very careful, and make troubles for recycling work.
In view of the existence of more above-mentioned problems, people can make syringe needle be contracted to the interior self-destruction syringe of injection tube by improving structure, having designed.For example, Chinese patent literature discloses a kind of syringe [Chinese patent application 01113237.X; Publication number CN1323637A], this syringe comprises injection tube and injection rod, injection rod is made up of the bar head and the body of rod, be provided with between bar head and the injection tube and lock device in, be provided with a needle holder in the injection tube front end, the center of needle holder is provided with the liquid-through hole of perforation, the injection tube front inner wall is provided with the retaining edge, retaining is along the outside that is positioned at needle holder, and the injection tube inwall of needle holder inboard is provided with stopping means, between bar head and the needle holder coupling arrangement is set.The advantage of this re-use preventing once-used syringe is difficult to be recovered again and produces for the back self-destruction degree height of finishing using; Simultaneously, in its needle holder and the syringe needle retraction injection tube, be convenient to the syringe collection and treatment.Obviously, such scheme solved to a certain extent existing disposable syringe can't realize self-destruction and be exposed to the outside syringe needle have problems such as potential safety hazard.
But the location structure design of the syringe of this class formation needle holder when work is also reasonable inadequately.In such scheme, be provided with an annular projection as stopping needle holder at the injection tube inwall, utilize annular projection to prevent that needle holder from axially moving backward when injection.Though this structure can realize axially locating backward, when self-destruction, need bigger active force just can make needle holder cross annular projection, realize moving axially, use relatively effort.In addition, this structure can't realize the circumferential location of needle holder, can cause syringe needle to rotate in use, influence injection effect.This on the other hand, the difficulty of assembling is also bigger, is difficult to realize automatization assembling, production cost is higher.
Summary of the invention
The purpose of this utility model is at the problems referred to above, and a kind of job stability height is provided, and is easy to use, smooth and easy, the self-destruction syringe of the retractable needle of rapid operation.
For achieving the above object, this utility model has adopted following technical proposal: the self-destruction syringe of this retractable needle, comprise the injection rod in injection tube and the injection tube, be provided with the needle holder that an energy is fixed thereon syringe needle and have liquid-through hole in the front end of injection tube, between needle holder and injection tube, be provided with and prevent that needle holder axially breaks away from the prelocalization mechanism of injection tube forward, has the bar head that injection rod and needle holder can be linked together at the front end of injection rod, it is characterized in that, be provided with the back detent mechanism that can prevent that needle holder from axially moving backward between described needle holder rear end and the injection tube, when injection rod links to each other with needle holder and injection rod when axially mobile backward, back detent mechanism can lose efficacy under the tilting action power of injection rod, and then it is axially mobile backward to make injection rod drive needle holder.
Owing to be provided with prelocalization mechanism and back detent mechanism, when normal the use, needle holder is for being fixed in the injection tube.When finishing using, injection rod pulls back, and the back detent mechanism was lost efficacy under the tilting action power that injection rod applies, and like this, injection rod just can be pulled into needle holder in the injection tube, avoids causing accident to stab when reclaiming.Because what injection rod applied is tilting action power, therefore, the easier back detent mechanism that makes lost efficacy, and it is very laborsaving to operate.
In the self-destruction syringe of above-mentioned retractable needle, described back detent mechanism comprises the lamellar locating ring and is arranged on the positioning step of injection tube inwall, described needle holder is pressed in locating ring on the positioning step, can make that the bar head is unidirectional to be passed and can be under the effect of bar head when the bar head retreats apply tilting action power to locating ring and make locating ring break away from the disengaging structure of positioning step also being provided with on the locating ring, and should break away from after locating ring breaks away from positioning step that structure can link to each other with needle holder and under the injection rod effect drive needle holder axially mobile backward.
Under the effect of injection rod, break away from structure locating ring is applied tilting action power, therefore apply less power and just can make between local disengaging needle holder earlier of locating ring and the positioning step.At this moment, continue to apply the active force of inclination, locating ring is broken away between needle holder and the positioning step fully.Obviously, this structure is very laborsaving when self-destruction.
In the self-destruction syringe of above-mentioned retractable needle, described disengaging structure comprises can make the unidirectional central tube that passes of bar head, the rear end of central tube by firm part and easily broken piece link with locating ring, the front end of central tube has and inserts in the needle holder and when the injection rod drive central tube mobile backward projection of stretchy needle holder during mobile setpoint distance backward.
Because firmly part links with central tube and locating ring all the time, and easily broken piece less axially can rupture during active force backward applying.When easily broken piece ruptured, because injection rod continues to apply active force by firm part to locating ring, at this moment, because only part connection between central tube and the locating ring, its active force tilted.The locating ring here, central tube, firm part and easy broken piece are connected as a single entity, and are made into integration by modes such as injection mouldings.
For the ease of locating ring is pulled out between needle holder and positioning step, in the self-destruction syringe of above-mentioned retractable needle, described locating ring ovalize, the both ends of its major axis are pressed on the positioning step by needle holder.The active force that this structure helps tilting is more pulled out locating ring.
In the self-destruction syringe of above-mentioned retractable needle, described easy broken piece has several and is thin rod shape, and easily broken piece is evenly distributed between central tube and the locating ring, and its two ends are connected with central tube and locating ring respectively.
Because when injection rod advanced, the bar head can be unidirectional through central tube, therefore, this moment, injection rod was less to the active force that central tube applies, and was not enough to easy broken piece is broken.And when the injection rod pumpback, the bar head is stopped that by central tube the active force that central tube is subjected to increases, thereby makes easy broken piece fracture occur.
In the self-destruction syringe of above-mentioned retractable needle, described needle holder rear end has the cavity that inserts for the projection of central tube, be provided with the annular retaining edge that is positioned at protruding rear in the cavity rear end, and when bar head drive central tube moved setpoint distance, described projection can be resisted against the annular retaining along last.
Behind the unidirectional insertion central tube of bar head, the injection rod pumpback, this moment, the bar head only applied active force to central tube, and needle holder is not applied active force for easy broken piece is broken.So just can make easy broken piece be subjected to the active force of bar head and occur breaking.And break and locating ring when breaking away between needle holder and the positioning step when easy broken piece, the projection of central tube can be resisted against the annular retaining along last, thereby makes injection rod apply active force to needle holder, realizes that it axially moves backward.
In the self-destruction syringe of above-mentioned retractable needle, described prelocalization mechanism comprises the location convex body that is arranged on the injection tube front inner wall and is arranged on the location baffle ring at needle holder middle part that described location baffle ring can be resisted against on the convex body of location.When injector to inject, injection rod moves to the injection tube front end, and the location baffle ring can be resisted against on the convex body of location, just avoids needle holder axially to move forward.
In the self-destruction syringe of above-mentioned retractable needle, described location convex body has several and distributes ringwise along the injection tube inwall, described needle holder outer wall have some its inners extend to the location baffle ring detent, each detent distribute ringwise and with the above-mentioned corresponding one by one setting of location convex body.Detent and the location convex body mutually against, avoided the syringe circumferential rotation of needle holder at work, make the state of the whole work of syringe more stable.
In the self-destruction syringe of above-mentioned retractable needle, the middle part of described needle holder is with sealing ring.Sealing ring is set improves sealing between needle holder and the injection tube, prevent to reveal.
In the self-destruction syringe of above-mentioned retractable needle, described injection rod front end is with piston body, and described bar head passes piston body, has otch at the middle part of injection rod.Owing to be provided with otch, after needle holder is drawn into injection tube, apply bigger active force to injection rod, injection rod is ruptured in incision, further improve the self-destruction degree.
Compared with prior art, the advantage of the self-destruction syringe of this retractable needle is: 1, owing to firm part links with central tube and locating ring all the time, and easily broken piece less axially can rupture during active force backward applying, central tube applies tilting action power to locating ring under the effect of injection rod, thereby locating ring is broken away between needle holder and the positioning step, enter in the injection tube thereby be convenient to needle holder.2, after the self-destruction, syringe needle also is brought in the injection tube along with needle holder, avoids causing accident to stab when reclaiming, and is safe.3, detent and location convex body mutually against, avoided the syringe circumferential rotation of needle holder at work, make the in stable condition of the whole work of syringe.
Description of drawings
Fig. 1 is the perspective view that this utility model provides.
Fig. 2 is the explosive view that this utility model provides.
Fig. 3 is the cutaway view that this utility model provides.
Fig. 4 is the partial enlarged drawing of A portion among Fig. 3.
Fig. 5 is the part-structure axonometric chart that this utility model provides.
Among the figure, injection tube 1, positioning step 11, location convex body 12, injection rod 2, bar head 21, otch 22, needle holder 3, cavity 31, annular retaining along 32, location baffle ring 33, detent 34, locating ring 41, central tube 42, protruding 42a, firmly part 43, easily broken piece 44, sealing ring 5, piston body 6.
The specific embodiment
As illustrated in fig. 1 and 2, the self-destruction syringe of this retractable needle comprises the injection rod 2 in injection tube 1 and the injection tube 1.Be provided with the needle holder 3 that an energy is fixed thereon syringe needle and has liquid-through hole in the front end of injection tube 1, the middle part of needle holder 3 is with sealing ring 5.Front end at injection rod 2 has the bar head 21 that injection rod 2 and needle holder 3 can be linked together.Injection rod 2 front ends are with piston body 6, and bar head 21 passes piston body 6, have otch 22 at the middle part of injection rod 2.
Shown in Fig. 3 and 4, between needle holder 3 and injection tube 1, be provided with and can prevent that needle holder 3 axially breaks away from the prelocalization mechanism of injection tube 1 forward, be provided with the back detent mechanism that can prevent that needle holder 3 from axially moving backward between needle holder 3 rear ends and the injection tube 1.When injection rod 2 links to each other with needle holder 3 and injection rod 2 when axially mobile backward, back detent mechanism can lose efficacy under the tilting action power of injection rod 2, and then makes injection rod 2 drive needle holder 3 axially to move backward.
More particularly, back detent mechanism comprises lamellar locating ring 41 and is arranged on the positioning step 11 of injection tube 1 inwall, needle holder 3 is pressed in locating ring 41 on the positioning step 11, can make that bar head 21 is unidirectional to be passed and can apply tilting action power to locating ring 41 under 21 effects of bar head and make locating ring 41 break away from the disengaging structure of positioning steps 11 when bar head 21 retreats also being provided with on the locating ring 41, and should break away from after locating ring 41 breaks away from positioning steps 11 that structure can link to each other with needle holder 3 and under injection rod 2 effects drive needle holder 3 axially mobile backward.The disengaging structure comprises can make the bar head 21 unidirectional central tubes that pass 42, the rear end of central tube 42 by firm part 43 and easily broken piece 44 link with locating ring 41, the front end of central tube 42 has and inserts in the needle holder 3 and drive the central tubes 42 mobile backward protruding 42a of stretchy needle holder 3 during mobile setpoint distance backward when injection rod 2.
As shown in Figure 5, locating ring 41 ovalizes, the both ends of its major axis are pressed on the positioning step 11 by needle holder 3.Easily broken piece 44 has several and is thin rod shape, and easily broken piece 44 is evenly distributed between central tube 42 and the locating ring 41, and its two ends are connected with central tube 42 and locating ring 41 respectively.Needle holder 3 rear ends have the cavity 31 for the protruding 42a insertion of central tube 42, be provided with the annular that is positioned at protruding 42a rear in cavity 31 rear ends and keep off along 32, and when bar head 21 drive central tubes 42 moved setpoint distance, protruding 42a can be resisted against the annular retaining along on 32.
In the present embodiment, locating ring 41, central tube 42, firm part 42 and easy broken piece 44 are connected as a single entity, and are made into integration by modes such as injection mouldings.
Because when injection rod 2 advanced, bar head 21 can be unidirectional through central tube 41, therefore, the active force that 2 pairs of central tubes 41 of injection rod this moment apply is less, is not enough to easy broken piece 44 is broken.Owing to be provided with cavity 31, bar head 21 can have moving freely of certain axial space in cavity 31.Behind bar head 21 unidirectional insertion central tubes 41, injection rod 2 pumpbacks, this moment, bar head 21 only applied active force to central tube 41, and needle holder 3 is not applied active force for easy broken piece 44 is broken.So just can make easy broken piece 44 be subjected to the active force of bar head 21 and occur breaking.And break and locating ring 31 when breaking away between needle holder 3 and the positioning step 11 when easy broken piece 44, the protruding 41a of central tube 41 can be resisted against the annular retaining along on 32, thereby makes 2 pairs of needle holder 3 of injection rod apply active force, realizes that it axially moves backward.
Shown in Fig. 2,3 and 4, prelocalization mechanism comprises location convex body 12 that is arranged on injection tube 1 front inner wall and the location baffle ring 33 that is arranged on needle holder 3 middle parts, and location baffle ring 33 can be resisted against on the convex body 12 of location.Location convex body 12 has several and distributes ringwise along injection tube 1 inwall, and needle holder 3 outer walls have the detent 34 that some its inners extend to location baffle ring 33, each detent 34 distribute ringwise and with the above-mentioned corresponding one by one setting of location convex body 12.
When injector to inject, injection rod 2 moves to injection tube 1 front end, and location baffle ring 33 can be resisted against on the convex body 12 of location, just avoids needle holder 3 axially to move forward.Detent 34 and location convex body 12 mutually against, avoided the syringe circumferential rotation of needle holder 3 at work, make the state of the whole work of syringe more stable.
Specific embodiment described herein only is that this utility model spirit is illustrated.This utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper used morely injection tube 1, positioning step 11, location convex body 12, injection rod 2, bar head 21, otch 22, needle holder 3, cavity 31, annular retaining along 32, location baffle ring 33, detent 34, locating ring 41, central tube 42, protruding 42a, firmly part 43, easy terms such as broken piece 44, sealing ring 5, piston body 6, do not get rid of the probability of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with this utility model spirit.
Claims (10)
1. the self-destruction syringe of a retractable needle, comprise the injection rod (2) in injection tube (1) and the injection tube (1), be provided with the needle holder (3) that an energy is fixed thereon syringe needle and have liquid-through hole in the front end of injection tube (1), between needle holder (3) and injection tube (1), be provided with and prevent that needle holder (3) axially breaks away from the prelocalization mechanism of injection tube (1) forward, front end at injection rod (2) has the bar head (21) that injection rod (2) and needle holder (3) can be linked together, it is characterized in that, be provided with the back detent mechanism that can prevent that needle holder (3) from axially moving backward between described needle holder (3) rear end and the injection tube (1), when injection rod (2) links to each other with needle holder (3) and injection rod (2) when axially mobile backward, back detent mechanism can lose efficacy under the tilting action power of injection rod (2), and then it is axially mobile backward to make injection rod (2) drive needle holder (3).
2. the self-destruction syringe of retractable needle according to claim 1, it is characterized in that, described back detent mechanism comprises lamellar locating ring (41) and is arranged on the positioning step (11) of injection tube (1) inwall, described needle holder (3) is pressed in locating ring (41) on the positioning step (11), can make that bar head (21) is unidirectional to be passed and can apply tilting action power to locating ring (41) down and make locating ring (41) break away from the disengaging structure of positioning step (11) in bar head (21) effect when retreating at bar head (21) also being provided with on the locating ring (41), and should break away from after locating ring (41) breaks away from positioning step (11) that structure can link to each other with needle holder (3) and under injection rod (2) acts on drive needle holder (3) axially mobile backward.
3. the self-destruction syringe of retractable needle according to claim 2, it is characterized in that, described disengaging structure comprises can make the unidirectional central tube that passes of bar head (21) (42), the rear end of central tube (42) by firm part (43) and easily broken piece (44) link with locating ring (41), the front end of central tube (42) has in the insertion needle holder (3) and drives central tube (42) the mobile backward projection (42a) of stretchy needle holder (3) during mobile setpoint distance backward when injection rod (2).
4. according to the self-destruction syringe of claim 2 or 3 described retractable needles, it is characterized in that, described locating ring (41) ovalize, the both ends of its major axis are pressed on the positioning step (11) by needle holder (3).
5. the self-destruction syringe of retractable needle according to claim 3, it is characterized in that, described easy broken piece (44) has several and is thin rod shape, easily broken piece (44) is evenly distributed between central tube (42) and the locating ring (41), and its two ends are connected with central tube (42) and locating ring (41) respectively.
6. the self-destruction syringe of retractable needle according to claim 3, it is characterized in that, described needle holder (3) rear end has the cavity (31) that inserts for the projection (42a) of central tube (42), be provided with the annular retaining edge (32) that is positioned at projection (42a) rear in cavity (31) rear end, and when bar head (21) drove the mobile setpoint distance of central tube (42), described projection (42a) can be resisted against the annular retaining along on (32).
7. according to the self-destruction syringe of claim 1 or 2 or 3 described retractable needles, it is characterized in that, described prelocalization mechanism comprises the location convex body (12) that is arranged on injection tube (1) front inner wall and is arranged on the location baffle ring (33) at needle holder (3) middle part that described location baffle ring (33) can be resisted against on the location convex body (12).
8. the self-destruction syringe of retractable needle according to claim 7, it is characterized in that, described location convex body (12) has several and distributes ringwise along injection tube (1) inwall, described needle holder (3) outer wall have some its inners extend to the location baffle ring (33) detent (34), each detent (34) distribute ringwise and with the above-mentioned corresponding one by one setting of location convex body (12).
9. according to the self-destruction syringe of claim 1 or 2 or 3 described retractable needles, it is characterized in that the middle part of described needle holder (3) is with sealing ring (5).
10. the self-destruction syringe of retractable needle according to claim 9 is characterized in that, described injection rod (2) front end is with piston body (6), and described bar head (21) passes piston body (6), has otch (22) at the middle part of injection rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202181307U CN201578701U (en) | 2009-10-19 | 2009-10-19 | Self-destroy type injector with retractable needle head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202181307U CN201578701U (en) | 2009-10-19 | 2009-10-19 | Self-destroy type injector with retractable needle head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201578701U true CN201578701U (en) | 2010-09-15 |
Family
ID=42720694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202181307U Expired - Lifetime CN201578701U (en) | 2009-10-19 | 2009-10-19 | Self-destroy type injector with retractable needle head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201578701U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094626A1 (en) * | 2012-12-20 | 2014-06-26 | Bencha International Group Inc. | Prefillable auto-retractable safety syringe |
-
2009
- 2009-10-19 CN CN2009202181307U patent/CN201578701U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094626A1 (en) * | 2012-12-20 | 2014-06-26 | Bencha International Group Inc. | Prefillable auto-retractable safety syringe |
| CN104902946A (en) * | 2012-12-20 | 2015-09-09 | 明辰股份有限公司 | Prefillable auto-retractable safety syringe |
| CN104902946B (en) * | 2012-12-20 | 2017-06-16 | 明辰股份有限公司 | Can preliminary filling automatic contractile safety syringe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100915 Effective date of abandoning: 20091019 |