Fluid delivery system with retractable needlesTechnical field
The present invention relates to technical field of medical instruments, and in particular to a kind of fluid delivery system with retractable needles.
Background technology
Traditional typically no anti-acupuncture function of pin group that decoction or blood sampling are inputted into human body, the pin after the completion of usePoint easily stabs medical personnel or other related personnel outside, meanwhile, decoction, tissue, microorganism are remained on syringe needleDeng multiple pollutant, these pollutants are easily traveled in air in the case of no quarantine measures, and environment is damaged.Moreover, for health, decoction is inputted into human body or the pin group of blood sampling is generally first use and avoids secondary use,If to needle cap on the needle point sleeve after the completion of use, although it is outer to solve the problems, such as that needle point is exposed to, probably makePin group is by secondary use, while needle cap also loss easy to fall off, still can not fundamentally solve the problems, such as anti-acupuncture.
Publication No. CN205885894U patent document discloses a kind of safty pin group, including connecting base, solid needle ring, folderThe lower seat of tug, the folder tug seat of honour and sheath, Gu needle ring has needle section, the folder tug seat of honour and the lower seat of folder tug coordinate integral, sheath setGroup is outside solid needle ring and is located among the tug seat of honour and the lower seat of folder tug, and grooved rail is corresponded on sheath and is provided with fixing projection, is fixedProjection can pass grooved rail from inside to outside, because grooved rail is gradually reducing with the abaculus groove place of communicating width and is being provided with symmetrical limit convexBlock, when needle section extrapolates sheath after use, fixing projection thereon enters abaculus groove, and with spacing block set prevents from fixing convexBlock exits abaculus groove and is positioned, and by needle section upper shield in sheath, if being now pushed outwardly sheath, sheath is because of limit convexThe stop of block can not again from abaculus groove deviate from, so as to prevent needle section stretched out from sheath it is exposed outside.
Although function of the safty pin group with anti-acupuncture disclosed in above-mentioned patent document, need by the folder tug seat of honour and folderThis two-part docking of the lower seat of tug, it could realize and the fixing projection on sheath is encased in grooved rail and prevents from fixing projection from grooveDeviate from rail, and this needle assemblies are generally disposable medical supplies, product consumption is big, and cost requirement is low, and productIt is smaller, so needle assemblies generally use high polymer material, and the wall thickness of each structure of component can not be too thick, and therefore, above-mentioned peaceBy holding section under being set on the seat of honour of pulling is pressed from both sides and in the case where folder is pulled on seat, setting can engage full pin group with the cooperation of lower holding sectionPortion, this two-part docking of seat under the tug seat of honour and folder tug is pressed from both sides to realize, while coordinate the seat shaping length perforation in the case where folder is pulled, pulled in folderThe corresponding shaping in the seat of honour can be caught in the fixing barb in long perforation, and the folder tug seat of honour is realized by fixing the cooperation of barb and long perforationThat is pulled folder between lower seat further engages；But upper and lower holding section is due to the influence of product structure, the comparison that can only be designedIt is small, it is easily deformed plus the structure of high polymer material, institute easily deviates from following holding section from upper holding section；Similarly, fixing is fallenHook and the cell wall of long perforation are also all the relatively thin structures for being easier to deformation, and it is also to be easier to take off from long perforate to fix barbGo out, so, docking built on the sand between seat, easily separated under the folder tug seat of honour in above-mentioned safty pin group is pulled with folder, and once presss from both sidesLoosening is docked between seat under the tug seat of honour is pulled with folder, the fixing projection of sheath will be detached easily from the abaculus groove at the folder tug seat of honourCome, so as to stretch out sheath so that safty pin group loses the effect of anti-acupuncture.
The content of the invention
Therefore, the technical problem to be solved in the present invention is to overcome the anti-acupuncture effect of needle assemblies of the prior art can notLean on, the defects of being easier to lose anti-acupuncture effect, while can not ensure to make a one-time use only, so as to provide a kind of anti-acupuncture effectThe fluid delivery system with retractable needles that fruit is reliable and syringe needle can not reuse after retraction.
In order to solve the above technical problems, a kind of fluid delivery system with retractable needles provided by the invention, including：
Syringe needle；
Needle guard, including set body, and the intrinsic accommodating cavity of set is formed at, the syringe needle is movably retracted to instituteState in accommodating cavity, one end of the accommodating cavity has the extending port for being available for the syringe needle to stretch out, and the set body is backwards to the pinOne end of head is elastic deformation end；
Locking set, have and axially extend, can house the installation cavity of the needle guard, the cavity wall of the installation cavity is provided with theOne lock；
The elastic deformation end is provided with corresponding with the described first lock the second lock, described second latch in described inThe elastic deformation end of needle guard forms buckle structure after the installation cavity of the elasticity extruding insertion locking set with the described first lock.
Also include axial limit structure, for when the syringe needle is entirely retracted in the accommodating cavity to the syringe needle and instituteThe relative position for stating needle guard is locked.
First lock is the projection or groove being arranged in the cavity wall of the installation cavity；
It is described second lock be by the accommodating cavity outer wall stretch out, with it is convex in the cavity wall of the installation cavityRise or groove coordinate to prevent the needle guard from moving axially relative groove or projection occurs with the locking set.
The cavity wall of the accommodating cavity in the corresponding position of the described second lock, circumferentially offer and extend respectively in axial directionThe first groove, the second groove；The set body is divided into the first elastic arm and the by first groove and second grooveTwo elastic arms, first elastic arm and the second elastic arm form the elastic deformation end, and second lock is arranged at describedOn first elastic arm and/or second elastic arm.
First groove, second groove respectively from it is described set body the remote extending port one end end face toExtend close to one end of the extending port.
Second groove is arranged at one end end of the set body away from the extending port.
The syringe needle is installed on the pin mounting structure of the fluid delivery system with retractable needles, the pin installationStructure includes：
Pin attachment structure, can be communicatively affixed with the one end of the syringe needle away from needle point；
Needle construction is held, can be reciprocatingly slided in first groove, and including affixed with the pin attachment structure and stretch outThe linking arm of first groove, and it is affixed with the linking arm and that stretches out first groove holds needle handle.
The needle handle of holding extends on the linking arm to the direction of the needle point.
The linking arm is between the outer wall of the syringe needle and the outer wall of the close linking arm for holding needle handleAngle is 30 °~150 °, or the linking arm is set close to the outer wall circular arc of the syringe needle.
The pin attachment structure is needle stand, and the one end of the needle stand away from the syringe needle connects with fluid delivery tube.
The pin attachment structure is fluid delivery tube.
The axial limit structure includes being entirely retracted to the appearance on the cell wall of first groove, in the syringe needlePut and hold the first block that needle construction moves relative to the needle guard towards the extending port described in stopping when in chamber.
The locking set is by the engagement sleeves of the described first lock and the described second lock loaded on the needle guard away from describedOne end of extending port, and its close to one end end face of the extending port when the syringe needle is entirely retracted in the accommodating cavity and instituteState and hold the one end of needle construction away from the extending port and offset.
The locking is enclosed on close to one end of the extending port formed with the opening portion connected with the installation cavity, described to openOral area is suitable to the needle guard, the syringe needle and the pin mounting structure and loaded；The hole wall of the installation cavity is close to the openingFormed with axially extending, can house the holding tank for holding needle construction, the axial limit structure includes setting for the one end in portionHold what needle construction was deviate from from the holding tank on the cell wall of one end of the opening portion, described in stop in the holding tankBlocking arm, and when it is described hold needle construction be placed in the holding tank, it is described second lock be caught in it is described first lock in when, it is describedSyringe needle is placed in the accommodating cavity completely.
The blocking arm forms the oriented inclined lead-in chamfered in groove center direction close to one end of the opening portion.
The cell wall of first groove is provided with holds pin when the syringe needle is entirely retracted in the accommodating cavity described in stopStructure is relative to the needle guard towards the second block away from extending port direction motion.
The needle guard is provided with the pushing part for being suitable to apply external force close to one end of the extending port, is molded on the pushing partThere is fixture block, the locking set forms the breach coordinated with the fixture block close to the corresponding position of one end of opening portion.
Technical solution of the present invention, have the following advantages that：
1. the fluid delivery system provided by the invention with retractable needles, by extruding the elasticity of the needle guard during installationDeformed end makes the needle guard smoothly enter in the locking set, and after the needle guard enters the locking set, and the elasticity becomesThere is the trend for recovering deformation at shape end in the presence of self-recovery elastic force, the second lock thereon is outwards flicked and the lockSurely the first snap fit on the installation cavity put forms buckle structure, is finished in blood sampling or transfusion, blood transfusion, mobile pinSet, after the syringe needle is fully retracted to the accommodating cavity of the needle guard, due to the buckle structure, the needle guard is locked notCan be mobile, the syringe needle is completely in the needle guard, and anti-acupuncture effect is reliable, and the syringe needle after retraction can not be againUse.
2. the fluid delivery system provided by the invention with retractable needles, in addition to axial limit structure, in instituteState syringe needle to be entirely retracted to lock the relative position of the syringe needle and the needle guard when in the accommodating cavity, so setting canPrevent the syringe needle from being moved when by external force in the needle guard towards the extending port direction and the syringe needle is stretched out instituteNeedle guard is stated, makes the anti-acupuncture effect of the fluid delivery system relatively reliable.
3. the fluid delivery system provided by the invention with retractable needles, the cavity wall of the accommodating cavity is in the described second lockThe corresponding position of button, circumferentially offer the first groove extended respectively in axial direction, the second groove；First groove and instituteState the second groove and the set body is divided into the first elastic arm and the second elastic arm, first elastic arm and the second elastic arm shapeInto the elastic deformation end, second lock is arranged on first elastic arm and/or second elastic arm.By settingThe first groove and the second groove are put, extrudes the first elastic arm and the second elastic arm, the first elastic arm and the second elasticity when mountedArm is deformed, and makes the groove width of first groove and the second groove while reduces, and second lock can be made to be pressed intoIn the installation cavity, and when described second snaps into up to the described first lock opening position, the first elastic arm and the second elastic armThere is the trend for recovering deformation in the presence of self-recovery elastic force, second lock is outwards flicked and be caught in first lockIn button.So that the needle guard is locked out moving, the syringe needle after the completion of use is completely in the needle guard, anti-pinIt is more reliable to pierce effect, and the syringe needle can not reuse after retraction.
4. the fluid delivery system provided by the invention with retractable needles, first groove, second groove pointDo not extend from one end end face of the remote extending port of the set body to close to one end of the extending port, described first is logicalGroove, the second groove are arranged at the free end of the needle guard, are easier that elastic deformation occurs when being squeezed, the needle guard is moreIt is convenient to enter in the locking set.
5. the fluid delivery system provided by the invention with retractable needles, second groove is arranged at the set bodyOne end end away from the extending port, the length of second groove are shorter so that the first elastic arm and the second elastic arm were bothThere can be a certain degree of deformation, and can enough keeps enough rigidity, so as in meeting that needle guard can cover into lockingMeanwhile the second lock formed with the first lock after buckle structure is more difficult relative to the first lock abjection, so that describedNeedle guard is locked out moving, and the syringe needle after the completion of use is completely in the needle guard and is more not easy to take off from needle guardGo out.
6. the fluid delivery system provided by the invention with retractable needles, described to hold needle handle on the linking arm to instituteThe direction extension of needle point is stated, so setting makes to hold that needle handle is nearer apart from needle point, facilitates the control to syringe needle.
7. the fluid delivery system provided by the invention with retractable needles, the axial limit structure is included located at describedNeedle construction is held relative to the pin described in stopping on the cell wall of first groove, when the syringe needle is entirely retracted in the accommodating cavityThe first block towards extending port motion is covered, can be prevented when the syringe needle is entirely retracted in the accommodating cavity by external forceIn the case of moved to the extending port direction, make the anti-acupuncture effect of the fluid delivery system relatively reliable, it is simple in construction, sideJust fabricate.
8. the fluid delivery system provided by the invention with retractable needles, the locking set by the described first lock withThe engagement sleeves of second lock are loaded on the one end of the needle guard away from the extending port, simple in construction, facilitate the locking setWith the installation of the needle guard, and its close to one end end face of the extending port when the syringe needle is entirely retracted in the accommodating cavityOffseted with the described one end of needle construction away from the extending port of holding.So setting can prevent the syringe needle to be directed away from the stretchingThe direction motion of mouth, makes anti-acupuncture effect relatively reliable.
9. the fluid delivery system provided by the invention with retractable needles, the locking is enclosed on close to the extending portFormed with the opening portion connected with the installation cavity, the opening portion is suitable to the needle guard, the syringe needle and pin peace for one endAssembling structure loads；The hole wall of the installation cavity is described formed with axially extending, can house close to one end of the opening portionThe holding tank of needle construction is held, the axial limit structure includes being arranged on groove of the holding tank close to one end of the opening portionOn wall, the blocking arm that needle construction is deviate from from the holding tank is held described in stop, and holds needle construction described in and is placed in the receivingIn groove, it is described second lock be caught in it is described first lock in when, the syringe needle is placed in the accommodating cavity completely.The syringe needleWhen being placed in completely in the accommodating cavity, the axial movement of the blocking arm limitation syringe needle and the locking set, described secondWhen lock is caught in first lock, the relative position of the needle guard and the locking set is locked, by setting the lockSurely covering such a middleware structure is finally locked the relative position of the syringe needle and the needle guard so that the fluid conveysApparatus structure is compact, and anti-acupuncture effect is reliable.
10. the fluid delivery system provided by the invention with retractable needles, the blocking arm close to the opening portion oneEnd forms the oriented inclined lead-in chamfered in groove center direction, facilitates the pin mounting structure smoothly to enter in the holding tank notEasily deviate from from the holding tank.
11. the fluid delivery system provided by the invention with retractable needles, the cell wall of first groove is provided withNeedle construction is held described in stopping when the syringe needle is entirely retracted in the accommodating cavity relative to the needle guard towards away from the extending portSecond block of direction motion, can prevent the needle guard from being taken off in the case of by the larger external force towards the extending port directionGo out the locking set and expose the syringe needle, anti-acupuncture effect is relatively reliable.
12. the fluid delivery system provided by the invention with retractable needles, the needle guard close to the extending port oneEnd is provided with the pushing part for being suitable to apply external force, fixture block is formed on the pushing part, the locking set is close to one end of opening portionCorresponding position form the breach coordinated with the fixture block, the convenient promotion to the needle guard.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior artThe required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing belowAccompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paidPut, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the needle guard provided in embodiments of the invention 1；
Fig. 2 is the structural representation of the locking set provided in embodiments of the invention 1；
Fig. 3 is the shaft side figure of the locking set shown in Fig. 2；
Fig. 4 is the sectional view of the locking set shown in Fig. 2；
Fig. 5 is the structural representation that the syringe needle that embodiments of the invention 1 provide is installed on pin mounting structure；
Fig. 6 is the structural representation for the fluid delivery system with retractable needles that the embodiment of the present invention 1 provides；
Fig. 7 is the structural representation for the needle guard that the embodiment of the present invention 2 provides；
Fig. 8 is the structural representation for the locking set that the embodiment of the present invention 2 provides；
Fig. 9 is that the syringe needle for the fluid delivery system with retractable needles that the embodiment of the present invention 2 provides is being installed with needle guardPreceding structural representation；
Figure 10 is that the syringe needle shown in Fig. 9 loads after needle guard with locking the structural representation of set in a pre-installation；
Figure 11 is that the structure after the fluid delivery system installation with retractable needles that the embodiment of the present invention 2 provides is shownIt is intended to；
Figure 12 is structural representation of the fluid delivery system with retractable needles after the completion of use shown in Figure 11.
Figure 13 is installed on the structural representation of the another embodiment of pin mounting structure for the syringe needle shown in Fig. 5.
Description of reference numerals：
1- syringe needles；2- needle guards；3- locking sets；
11- needle stands；12- holds needle handle；13- linking arms；
The grooves of 21- first；The grooves of 22- second；23- second is latched；
The blocks of 24- first；The blocks of 25- second；26- pushing parts；
31- first is latched；32- holding tanks.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementationExample is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skillThe every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each otherIt is be combined with each other into conflict can.
Embodiment 1
As shown in figures 1 to 6, the present embodiment provides a kind of fluid delivery system with retractable needles, including syringe needle 1, needle guard2nd, locking set 3 and axial limit structure.
Needle guard 2 includes set body, and is formed at the intrinsic accommodating cavity of set, and the syringe needle 1 is movably retracted toIn the accommodating cavity, one end of the accommodating cavity has the extending port for being available for the syringe needle 1 to stretch out, and the set body is backwards to describedOne end of syringe needle 1 is elastic deformation end.
Locking set 3 has the installation cavity for axially extending, can housing the needle guard 2, and the cavity wall of the installation cavity is provided withFirst lock 31；The elastic deformation end is provided with second lock 23 corresponding with the described first lock 31, second lockButton 23 latches in the elastic deformation end of the needle guard 2 after the installation cavity of the elastic extruding insertion locking set 3 with described first31 form buckle structure.
The needle guard is set smoothly to enter in the locking set by extruding the elastic deformation end of the needle guard 2 during installation,After the needle guard enters the locking set, and the elastic deformation end has becoming for recovery deformation in the presence of self-recovery elastic forceGesture, make second latching and can outwards flick and first snap fit locked on the installation cavity that puts is formed and locked thereonBuckle structure, finished in blood sampling or transfusion, blood transfusion, the mobile needle guard 2, the syringe needle 1 is fully retracted to the appearance of the needle guard 2After putting intracavitary, due to the buckle structure, the needle guard 2 is locked out moving, and the syringe needle 1 is completely in the needle guard 2Inside, anti-acupuncture effect is reliable, and the syringe needle 2 can not reuse after retraction.
First lock 31 is the projection or groove being arranged in the cavity wall of the installation cavity；Described second, which latches 23, isStretched out from the outer wall of the accommodating cavity, coordinated with the projection in the cavity wall of the installation cavity or groove with described in preventingNeedle guard 2 covers 3 with the locking and moving axially relative groove or projection occurs.In the present embodiment, as in Figure 2-4,First lock 31 is is arranged on the groove on the installation cavity, as shown in figure 1, second lock 23 is described to be arranged onProjection on the outer wall of accommodating cavity.
In the present embodiment, the needle guard 2 needs to be extruded and inserted in the installation cavity of the locking set 3, and toSecond lock 23 described in when flicking outside can be caught in first lock 31, therefore the needle guard 2 needs have reliable elastic force,To ensure that the needle guard 2 has reliable elastic force, the cavity wall of the accommodating cavity is on corresponding position, the edge of the described second lock 23Circumferentially offer the first groove 21 extended respectively in axial direction, the second groove 22；First groove and second groove willThe set body is divided into the first elastic arm and the second elastic arm, and first elastic arm and the second elastic arm form the elasticity and becomeShape end, second lock are arranged on first elastic arm and/or second elastic arm.By setting the first groove 21With the second groove 22, the first elastic arm and the second elastic arm are extruded when mounted, and the first elastic arm and the second elastic arm becomeShape, make the groove width of the groove 22 of the first groove 21 and second while reduce, second lock 23 can be enable to be pressed into instituteState in installation cavity, and when the described second lock 23 reaches 31 opening position of the first lock, the first elastic arm and the second elasticityArm has the trend for recovering deformation in the presence of self-recovery elastic force, second lock 23 is outwards flicked and is caught in described theIn one lock 31.So that the needle guard is locked out moving, the syringe needle after the completion of use is completely in the needle guardInterior, anti-acupuncture effect is more reliable, and the syringe needle can not reuse after retraction.When the length of second groove 22 is spentWhen big, the rigidity of the needle guard 2 can be influenceed, is easily deformed, therefore in the present embodiment, second groove 22 is setIn one end end of the set body away from the extending port so that the first elastic arm and the second elastic arm can either have necessarilyThe deformation of degree, and can enough keep enough rigidity, so as to while meeting that needle guard can enter in locking set, be locked with firstIt is buckle-shaped to deviate from into the second lock after buckle structure is more difficult relative to the first lock, so that the needle guard is locked outMobile, the syringe needle after the completion of use is completely in the needle guard and is more not easy to deviate from from needle guard.And describedOne groove, the second groove are arranged at the free end of the needle guard, are easier that elastic deformation, the pin occurs when being squeezedSet is more convenient to be entered in the locking set.As disposable embodiment, first groove 21, second groove 22 divideDo not extend from one end end face of the remote extending port of the set body to close to one end of the extending port, can so make instituteState the first groove 21, the second groove 22 has larger length, make the needle guard 2 that there is reliable elastic force.
As disposable embodiment, second groove 22 is arranged on the needle guard 2 and the described second lock 23The interlude of correspondence position.
In the present embodiment, the syringe needle 1 is installed on the pin installation of the fluid delivery system with retractable needlesIn structure, the pin mounting structure includes：Pin attachment structure, can be communicatively affixed with the one end of the syringe needle away from needle point；HoldNeedle construction, it can be reciprocatingly slided in first groove 21, and including affixed with the pin attachment structure and stretch out described firstThe linking arm of groove 21, and it is affixed with the linking arm and that stretches out first groove holds needle handle 12.It is as shown in figure 5, describedHold needle handle on the linking arm to the direction of the needle point to extend, so set that to make to hold needle handle nearer apart from needle point, facilitate pairThe control of syringe needle.In the present embodiment, the linking arm close to the syringe needle outer wall and it is described hold needle handle close to describedAngle between the outer wall of linking arm is 30 °~150 °.In the embodiment of deformation, as shown in figure 13, the linking arm leans onThe outer wall circular arc of the nearly syringe needle is set.Specifically, as shown in fig. 7, the pin attachment structure is needle stand 11, the needle stand 11 is remoteOne end from the syringe needle 1 connects with fluid delivery tube.
In the present embodiment, when the syringe needle 1 is entirely retracted in the accommodating cavity, for prevent the syringe needle 1 byTo during external force in the needle guard 2 towards extending port direction motion and the syringe needle 1 is stretched out the needle guard 2 influences anti-pinPierce effect, as shown in Fig. 2 the locking set 3 close to one end of the extending port formed with being opened with what the installation cavity connectedOral area, the opening portion are suitable to the needle guard 2, the syringe needle 1 and the pin mounting structure and loaded；The hole wall of the installation cavity existsClose to one end of the opening portion formed with axially extending, can house the holding tank 32 for holding needle construction, the axial direction limitsBit architecture holds needle construction from institute including being arranged on the holding tank 32 on the cell wall of one end of the opening portion, described in stopState the blocking arm deviate from holding tank 32, and when it is described hold needle construction be placed in the holding tank 32, the card of the second lock 23When entering in first lock 31, the syringe needle 1 is placed in the accommodating cavity completely.The syringe needle is placed in the appearance completelyWhen putting in chamber, the blocking arm limits the axial movement of the syringe needle and the locking set, and second lock is caught in described firstWhen in lock, the relative position of the needle guard and the locking set is locked, by setting the locking to cover such a centrePart structure is finally locked the relative position of the syringe needle and the needle guard so that the fluid delivery system is compact-sized, preventsAcupuncture effect is reliable.
Smoothly it can enter for convenience of the pin mounting structure in the holding tank 32, as shown in Fig. 2 close in the blocking armOne end of the opening portion forms the oriented inclined lead-in chamfered in groove center direction, and so setting also makes the pin mounting structure notEasily deviate from from the holding tank 32.
When the syringe needle 1 is entirely retracted in the accommodating cavity, the needle construction of holding is located in the holding tank 1, it is impossible toThe extending port direction motion, at this moment if applied to the needle guard 2 towards the larger power in the extending port direction, may make instituteState needle guard 2 to deviate from the locking set 3 and make the syringe needle 1 expose the anti-acupuncture effect of influence, to ensure the reliable of anti-acupuncture effectProperty, as shown in figure 1, being hindered being provided with the cell wall of first groove 22 when the syringe needle 1 is entirely retracted in the accommodating cavityNeedle construction is held described in gear relative to the needle guard 2 towards the second block 25 away from extending port direction motion.
In improved embodiment, the needle guard 2 is promoted for convenience, the needle guard 2 is close to one end of the extending portProvided with the pushing part 26 suitable for applying external force, fixture block is formed on the pushing part, the locking set 3 is close to one end of opening portionCorresponding position form with the fixture block coordinate breach.
During specific installation, the pin mounting structure for including needle stand 11, holding needle construction of syringe needle 1 will have been installed first from needle guard 2The remote extending port one end load in the accommodating cavity of the needle guard 2 and be pushed to first groove 21 close to describedOne end of extending port, then needle guard 2 is fitted into the installation cavity of the locking set 3 from the opening portion, the needle guard 2 is enteringThe position of relatively described first lock 31 in position of second lock 23 is staggered during the installation cavity, prevent described secondLock 23 is caught in first lock 31, the remote extending port in the described second lock 23 positioned at the described first lock 31Side after, rotate the needle guard 2, make it is described hold the correspondence position that needle handle 12 is located at the holding tank 32, now described secondThe position of lock 23 is corresponding with the position of the described first lock 31, then proceedes to promote the needle guard 2, until described hold pin knotStructure enters in the holding tank 32, installs, puts needle cap to syringe needle 1, syringe needle 1 can come into operation.When blood sampling or infuse, defeatedBlood finishes, pushing part 26 described in hand propelled, the needle guard 2 is moved to the extending port direction until the syringe needle 1 is completeIn the accommodating cavity of the needle guard 2, now first lock 31 engages with the described second lock 23, the needle guard 2 and instituteThe relative position for stating locking set 3 is locked, at the same it is described hold needle construction and be located in the holding tank 32 and can not move, anti-acupuncture is imitatedFruit is reliable and syringe needle 1 can not reuse after retraction.Also the needle guard 2 can be pinned with hand makes the needle guard 2 motionless, pulls atLocking set 3, the locking set 3 is set to be moved to away from the extending port direction, the locking set 3 is driven by the holding tank 32The syringe needle 1 moves to away from the extending port direction, until the syringe needle 1 is entirely retracted in the accommodating cavity, it is now describedFirst lock 31 engages with the described second lock 23, and the relative position of the needle guard 2 and the locking set 3 is locked.
In interchangeable embodiment, the pin attachment structure is fluid delivery tube, and the syringe needle 2 to be mounted directly to streamIn body delivery pipe.
Embodiment 2
The difference of the present embodiment and above-described embodiment is that as Figure 7-9, the axial limit structure includes being located at instituteState on the cell wall of the first groove 21, stop when the syringe needle 1 is entirely retracted in the accommodating cavity described in hold needle construction relative toThe first block 24 that the needle guard 2 moves towards the extending port, when can prevent that the syringe needle is entirely retracted in the accommodating cavityMoved in the case of by external force to the extending port direction, make the anti-acupuncture effect of the fluid delivery system relatively reliable,Convenient processing and manufacturing simple in construction.
For convenience of the locking set and the installation of the needle guard, the locking set 3 by the described first lock 31 with it is describedThe engagement sleeves of second lock 23 are loaded on the described one end of needle guard 2 away from the extending port, and it is close to one end of the extending portEnd face offsets when the syringe needle 1 is entirely retracted in the accommodating cavity with the described one end of needle construction away from the extending port of holding.The direction motion that the syringe needle can be prevented to be directed away from the extending port is so set, makes anti-acupuncture effect relatively reliable.
When specifically used, when mounted, as shown in figs9-12, first by installed syringe needle 1 include needle stand 11, hold pin knotThe pin mounting structure of structure loads in the accommodating cavity of the needle guard 2 from one end of the remote extending port of needle guard 2 and makes the pinThe position of seat 11 is located at the side of the close extending port of first block 24, and the locking then is covered into 3 is sleeved on instituteThe elastic deformation end of needle guard 2 is stated, the first lock 31 that the locking is covered on 3 forms lock with the second lock 23 on the needle guard 2Buckle structure, the locking set 3 is seted, from moving, the needle stand 11 to be pushed into described first with the relative position of the needle guard 2The end of the close extending port of groove 21, needle cap is covered to the syringe needle 1, the syringe needle 1 can be used.When blood sampling or defeatedLiquid, blood transfusion finish, hold on the other hand it is described hold needle handle 12, by it is described hold needle handle 12 promote to the direction away from the extending port untilThe opposite side held needle handle 12 and move to first block 24, at this moment the syringe needle 1 be entirely retracted in the accommodating cavity, instituteLocking set 3 is stated to offset close to one end end face of the extending port and the described one end of needle handle 12 away from the extending port of holding, it is describedSyringe needle 1 can neither move to the direction of the extending port, can not be moved to the direction away from the extending port, anti-acupuncture effectReliable and described syringe needle 1 can not reuse after retraction.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is rightFor those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change orChange.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out orAmong changing still in the protection domain of the invention.