CN101128232A - Safety medical syringe with retractable needle - Google Patents

Safety medical syringe with retractable needle Download PDF

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Publication number
CN101128232A
CN101128232A CNA2005800426643A CN200580042664A CN101128232A CN 101128232 A CN101128232 A CN 101128232A CN A2005800426643 A CNA2005800426643 A CN A2005800426643A CN 200580042664 A CN200580042664 A CN 200580042664A CN 101128232 A CN101128232 A CN 101128232A
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CN
China
Prior art keywords
syringe
plunger
syringe needle
binding clasp
needle binding
Prior art date
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Granted
Application number
CNA2005800426643A
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Chinese (zh)
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CN101128232B (en
Inventor
格雷格·雅内克
文森特·伦福拉
李仙·玉
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Mitchell R Clark
Midland Medical Devices Holdings LLC
Original Assignee
Safety Medical International Inc
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Application filed by Safety Medical International Inc filed Critical Safety Medical International Inc
Priority claimed from PCT/US2005/036535 external-priority patent/WO2006044390A2/en
Publication of CN101128232A publication Critical patent/CN101128232A/en
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Publication of CN101128232B publication Critical patent/CN101128232B/en
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Abstract

A syringe includes a hollow barrel, a hollow plunger movable within the barrel and a needle assembly secured within and at a distal end of the barrel. The needle assembly includes a needle holder, a resilient member that biases the needle holder toward the proximal end opening of the barrel, and a retaining member releasably secured to the needle holder via a reduced material section. The retaining member maintains the needle holder at the distal end of the barrel against the bias of the resilient member. When the plunger is fully depressed within the barrel, the plunger engages the needle holder such that the retaining member is forced to break away and separate from the needle holder along the reduced material section to facilitate retraction of the needle holder and a needle secured to the needle holder into the retraction cavity disposed within the plunger.

Description

Safe medical syringe with retractable needle
Cross reference to related application
It is " safe medical syringe with retractable needle " and the U.S. Provisional Patent Application No.60/618 that submits on October 14th, 2004 that the application requires exercise question, 137, exercise question is for " safe medical syringe with retractable needle " and in the U.S. Provisional Patent Application No.60/626 of submission on November 12nd, 2004,916, be " safe medical syringe " and the U.S. Provisional Patent Application No.60/657 that submits on March 3rd, 2005,700 priority with exercise question with retractable needle.Whole disclosures of these patent applications are bonded to here by reference.
Technical field
The present invention relates to safe medical syringe, and relate to the syringe that has withdrawal and be limited to the syringe needle of single use particularly.
Background technology
Because a lot of reasons, retractable syringe becomes and becomes more and more important to heavens and be used for hospital and medical mechanism ideally.Particularly, retractable syringe is limited to single usually to be used, wherein the hypodermic needle of syringe is withdrawn in the syringe after absorption and injecting fluid, therefore prevents from repeatedly to use pathophorous potential propagation between syringe and HIV (human immunodeficiency virus) (HIV) and other patient.After usefulness, the syringe needle retract syringes also shielded syringe needle and prevent to cause careless syringe needle to pink or puncture for patient and health worker.
Various retractable syringe device has been designed to effectively syringe needle is withdrawn in the syringe after usefulness.Yet difficulty is a kind of like this retractable syringe of design, and it is limited to single uses, yet design and assembling are simple, thereby syringe can reduce manufacturing cost simultaneously with big production scale manufacturing.
Summary of the invention
One object of the present invention is to provide a kind of retractable syringe simple and can not reuse that uses.
Another purpose of the present invention is to provide the retractable syringe of a kind of simplicity of design and low cost of manufacture.
Realized aforementioned purpose respectively and in combination, and the present invention should not be understood as that and require two or more purposes to combine, unless explicitly call for by claims.
According to the present invention, a kind of syringe comprises: hollow syringe, and it has at the opening of syringe proximal end, at the opening at distal barrel end place be located at fluid chamber in the syringe; And hollow plunger, it extend in the syringe via proximal openings and can be in syringe towards with axially move away from distal openings, this plunger has end wall, and this end wall moves so that reach the withdrawal cavity of being located at the plunger from the plunger distal end opening during the opening part of being located at the plunger distal end place is fixed to plunger releasedly and is using syringe.This syringe also has in the distal barrel end of being fixed on and is positioned at the needle assembly at this place.This needle assembly has the syringe needle binding clasp, towards the elastomeric element of syringe proximal openings bias voltage syringe needle binding clasp, be fixed to the holding member of syringe needle binding clasp releasedly via the material part that reduces, thereby wherein this syringe needle binding clasp has adapter and allows syringe needle to extend through the distal openings of syringe syringe needle is fixed to the syringe needle binding clasp.
This holding member overcomes elastomeric element at the distal barrel end place bias voltage keeps the syringe needle binding clasp, and when plunger fully is pressed in the syringe, be forced in the plunger and holding member is forced to break away from and separate along the material part that reduces from the syringe needle binding clasp so that end wall, syringe needle binding clasp and the syringe needle that is fixed to the syringe needle binding clasp are withdrawn into the withdrawal cavity thereby plunger is configured to joint pin head binding clasp plunger end wall.
In the exemplary embodiment, this plunger end wall is included in the frictionally connector of engage pistons of plunger distal end opening part, and when distal barrel end is pressed into plunger, connector is configured to joint pin head binding clasp and so that connector breaks away from and is convenient to from plunger connector, syringe needle binding clasp and the syringe needle that is fixed to the syringe needle binding clasp is withdrawn into the withdrawal cavity.
By following detailed to its specific embodiment, especially when in conjunction with the accompanying drawings, can know the present invention above-mentioned with other purpose, feature and advantage, identical reference number is used to illustrate identical member in each figure.
Description of drawings
Fig. 1 is the side cross-sectional view according to embodiment of the invention syringe, and wherein syringe needle is in resting state from injector syringe extension and syringe;
Fig. 2-the 5th, the cross section partial side view of the syringe of Fig. 1 illustrates that in detail the interaction in being pressed into the different phase of plunger of plunger distal end and needle assembly near-end is so that withdraw needle assembly according in the syringe of the present invention;
Fig. 6 is the side cross-sectional view of Fig. 1 syringe, and fully is being withdrawn in the syringe with the back syringe needle;
Fig. 7-the 10th, the cross section partial side view according to the optional embodiment of syringe of the present invention illustrates that in detail the interaction in being pressed into the different phase of plunger of plunger distal end and needle assembly near-end is so that be withdrawn into needle assembly in the syringe;
Figure 11 is the cross section partial side view of another optional embodiment of the syringe according to the present invention;
Figure 12 and 13 is the partial views in cross section according to the plunger of optional syringe embodiment of the present invention;
Figure 14 is the side cross-sectional view of syringe according to another embodiment of the present invention, and wherein syringe needle is in resting state from injector syringe extension and syringe;
Figure 15 is that perspective and local cross-section with Figure 14 syringe of injector syringe proximal part are divided view;
Figure 16 is the exploded perspective illustration of a part with Figure 14 syringe of needle assembly and injector syringe distal portions, and a part is removed to disclose syringe inside;
Figure 17-the 20th, the cross section partial side view of Figure 14 syringe illustrates the interaction in being pressed into the different phase of plunger of plunger distal end and needle assembly near-end so that needle assembly is withdrawn according in the syringe of the present invention in detail;
Figure 21 is the side cross-sectional view of Figure 14 syringe, and fully is being withdrawn in the syringe with the back syringe needle;
Figure 22 is the cross section partial exploded side view of the part of another embodiment of syringe according to the present invention;
Figure 23 is the cross section partial side view of another embodiment of syringe according to the present invention;
Figure 24 is the cross section partial side view of the another embodiment of the syringe according to the present invention;
Figure 25 is the cross section partial side view of another embodiment of the syringe according to the present invention;
Figure 26 A is used for the partial side view of the syringe needle binding clasp of syringe according to another embodiment of the present invention;
Figure 26 B is according to of the present invention and have the cross section partial side view of syringe embodiment of the syringe needle binding clasp of Figure 26 A.
The specific embodiment
With reference to figure 1, injector for medical purpose 20 has hollow cylindrical syringe 22, and this syringe has the opening 23 that size is suitable for receiving hollow plunger 30 in its proximal end, and has permission exposes syringe needle 60 from syringe opening at its far-end.The remote extension portion 26 that syringe 22 has the main part 24 of a part that receives and keep plunger 30 and has the internal diameter that reduces with respect to main part 24 is to receive needle assembly as described below 56.Plunger 30 has near the elastic sealing element 32 of its far-end around plunger.Fluid cavity 50 is limited in the syringe 22 between the far-end 25 of other distal portions of elastic sealing element 32 and plunger and syringe main part 24, wherein fluid cavity based on plunger with respect to the axial displacement of syringe and change volume.The far-end that sheath 68 can be fixed to syringe 22 removedly uses the syringe syringe needle 60 that is fixed in the syringe as described below before to be enclosed in.Other member of all of syringe, plunger, elastic sealing element, sheath and syringe can be constructed by any suitable medical grade material of being convenient to operating syringe as described below (for example plastics and/or rustless steel).
The near-end of plunger 30 has convex surface or cheese thumb pad 38 and radially extending flange 39 so that engage user finger and/or thumb during operating syringe.Similarly, syringe main part 24 has near its near-end setting so that engage the radially extending flange 28 of user finger and/or thumb during operation.The syringe part 27 that prolongs extends between flange 28 and syringe near-end and internal diameter is a bit larger tham the remainder of main part 24.The syringe part 27 that prolongs also has sufficient longitudinal size, and internal diameter is slightly smaller than the plunger lateral dimension that limits at flange 39 places, thereby, when plunger 30 fully was pressed in the syringe, plunger flange 28 forced the syringe part 27 of prolongation to enter the prolongation syringe part in syringe proximal end slight bending to allow flange.When fully being pressed into plunger in the syringe, plunger flange 39 engages near the syringe near-end along the annular groove 29 of the inwall setting that prolongs syringe part to prevent removing the plunger (see figure 6) from syringe with the chucking locking relation.
With reference to figure 2, the far-end of plunger 30 is sealed shut by end wall 44, and wherein this end wall preferably is molded into a part of plunger.End wall 44 has the annular incision or the barbed portion 46 of extending around the end wall periphery.Barbed portion 46 be limited to be pressed into the thin membrane that is torn during the plunger or ruptures or minimizing the material part so that during use syringe as described below, arrive the withdrawal cavity 48 of plunger.End wall 44 also has the fi-ustoconical surface 45 of extending and engage partly the frustoconical cavity part 59 of needle assembly 56 towards distal barrel end when plunger as described below fully is pressed in the syringe.Alternatively, according to concrete application need end wall can be formed with suitable outwards or the surface (for example, taper, convex, V-arrangement, multiaspect shape etc.) or even the flat surfaces that extend internally.
Needle assembly 56 has syringe needle binding clasp or valve rod 58, thus its connect syringe needle 60 and be fixed in the distal barrel end extension 26 before use and between the operating period syringe needle 60 extend (as shown in Figure 1) from distal barrel end.Syringe needle valve rod 58 and syringe needle 60 preferably be bonded with each other releasedly (for example via threads engage).Thereby extend axially cavity 57 from the proximal extension of syringe needle valve rod 58 to being communicated with fluid that the junction point of syringe needle 60 is convenient to the fluid cavity 50 in syringe needle and syringe.In addition, cavity 57 has the part of broadening 59 in the proximal end of syringe needle valve rod 58, thereby this part is Frusto-conical and broadens substantially corresponding to the fi-ustoconical surface 45 of plunger 30 towards the syringe near-end.Especially, the central axial line that the part that broadens 59 departs from syringe needle valve rod 58 a little (for example, with about 3-5 °) and have somewhat different than the angled surface on the angled surface of plunger end wall 44, thereby when plunger was pressed towards needle assembly, conical butt plunger end wall surface 45 was also not exclusively aimed at and corresponding to the part 59 that broadens.Syringe needle valve rod 58 also has radially extending flange 62 in its proximal end, thereby its size is suitable for engaging along the step or the protuberance 21 of the inner surface setting of remote extension portion 26 and prevents that needle assembly surpasses protuberance 21 to distal movement during being pressed into plunger towards distal barrel end.
Disc valve burr 64 is fixed to the flange 62 of syringe needle valve rod 58 and from then on radially extends inner wall surface with the remote extension portion 26 that engages syringe.Stem ring 64 preferably is molded into the part of flange 62 and syringe needle valve rod 58 and has otch or barbed portion 65 at the junction point place of stem ring 64 and syringe needle valve rod 58.Barbed portion 65 limits the thin barrier film or the material part of minimizing, and this part is torn during operating syringe or ruptures so that retracted needle assembly 56 in the following manner.The gravel size decision ground of stem ring 64 is suitable for impelling when plunger is pressed into, and the breaking portion of stem ring partly slides with joint pin head valve bar 58 as described below along the syringe inner wall surface.
Engage the position of syringe at stem ring, the diameter of stem ring can be selected as being slightly smaller than, being equal to or slightly greater than the diameter of the inner wall surface of remote extension portion 26.In Fig. 1-6 illustrated embodiment, compressed a little and is formed effectively fluid seal thoroughly thereby the diameter of stem ring 64 is a bit larger tham diameter stem ring during engaging syringe of the inner wall surface of the syringe that engages stem ring.The size of stem ring is also selected with when plunger is pressed in the syringe fully, provides compressed fit/not saturating fluid seal at the interface at stem ring/syringe inwall, is convenient to stem ring simultaneously and slides in the syringe inner wall surface.
Radial protrusion or shoulder 66 are along the near-end setting of inner surface and close distal barrel end extension 26.Shoulder 66 engages stem ring 64 to prevent needle assembly towards the motion of syringe near-end, and stem ring keeps connecting with syringe needle valve rod 58 simultaneously.Alternatively, notice that a series of spaced radial projection can be configured to be implemented in the identical result of distal barrel end extension place joint or lock-up valve burr, thereby prevent needle assembly that stem ring still is attached to the syringe needle valve rod simultaneously towards the motion of syringe near-end.Elastomeric element 84 (for example wind spring) is located between the flange 62 and inner protuberance 86 of syringe needle valve rod 58, should be located on the inner surface of remote extension portion 26 by the inside protuberance in the position between radial protrusion 64 and the distal barrel end.When needle assembly 56 be press fitted in the remote extension portion 26 of syringe (as described below) thus stem ring 64 is when remote extension surpasses syringe radial protrusion 66, elastomeric element 84 is compressed with towards syringe near-end bias voltage needle assembly.
Syringe 20 be designed such that with plunger 30 be pressed into fully be convenient in the syringe 22 tear in combination or rupture plunger end wall 44 and also from the flange 62 of syringe needle valve rod 58 tear or the stem ring 64 that ruptures so that syringe needle valve rod and syringe needle 60 are withdrawn into the withdrawal cavity 48.Particularly, plunger 30 has ring edge 78 at its far-end, and this edge tilts with respect to the plane perpendicular to the central axial line of syringe with minute angle (for example, approximately 3-5 °).Similarly, syringe needle valve rod 58 has ring edge 80 in its proximal end, and this edge tilts with minute angle (for example, about 3-5 °) with respect to the plane perpendicular to the syringe central axial line.
Thereby plunger and syringe needle valve rod can be assembled in the syringe summit that is formed by their annular surface in opposite directions 78 and 80 and aim at any selected mutual orientation.Mutual certain orientation is not particular importance for the function of syringe on the summit of plunger in the syringe and syringe needle valve rod.Therefore, though Fig. 1-5 illustrates the annular surface 78 of plunger and syringe needle valve rod become with about 180 ° anglec of rotation with 80 summit and departs from mutually, this summit also can be aimed at substantially mutually or depart from and do not influence the operability of syringe withdrawal feature with any other selected anglec of rotation (for example, 45 °, 90 ° etc.).The annular surface 78 of plunger and syringe needle valve rod and 80 when the syringe longitudinal direction also has suitable size and is pressed into plunger fully with box lunch and/or near its barbed portion 46 and 65 place's engage pistons end wall 44 and stem rings 64, this be convenient to then from plunger tear or rupture end wall 44 and from syringe needle valve rod flange 58 tear or the stem ring 64 that ruptures to begin making needle assembly 56 be withdrawn into the withdrawal cavity 48 of plunger.Alternatively, the annular surface 78 of plunger can be oriented to joint from barbed portion 65 with suitable distance (for example, more near the external diameter of stem ring and syringe inner wall surface) thus a part of the syringe needle valve rod of removing forms the leverage of required degree with respect to barbed portion 65 for plunger when the plug engages syringe needle valve rod and therefore is convenient to be more prone to during operating syringe and tears or the stem ring that ruptures from syringe needle valve rod flange more efficiently.
Syringe assembling so realizes, promptly at first with elastomeric element 84 and then needle assembly 56 (having or do not have syringe needle 60) insert in the opening 23 of syringe 22 proximal ends, by main part 24 and enter remote extension portion 26.When the stem ring 64 of syringe needle valve rod 58 ran into the annular shoulder 66 of syringe, stem ring connected the mode of closing with card and is compressed a little and be forced to far-end and surpass shoulder 66.Surpassed shoulder 66 in case stem ring 64 is forced to far-end, then needle assembly 56 is locked into place in remote extension portion 26, and elastomeric element 84 be compressed with in syringe to near-end bias voltage needle assembly.Stem ring 64 keeps being compressed to selected degree and fluid seal thoroughly is provided at its compressed fit contact point place with syringe effectively between flange 62 and syringe inner wall surface in this locking mechanism.Plunger 30 be inserted into then the opening 23 of syringe 22 and axially displacement suitably distance so that use syringe.Before needle assembly was inserted syringe 22, syringe needle 60 can connect syringe needle valve rod 58.Alternatively, syringe needle 60 can be connected to the coupling part of syringe needle valve rod 58 after the fixed needle valve rod in syringe.In arbitrary situation, syringe needle 60 is outstanding so that use syringe from the opening of distal barrel end after assembling.
In operation, plunger distal end is shifted suitable distance so that fluid is sucked the fluid cavities 50 from syringe needle 60 towards the syringe near-end.When syringe needle was placed the injection site, plunger was pressed towards distal barrel end then to force fluid flow from cavity 50 and by syringe needle 60.With reference to figure 2-5, when plunger was pressed further in the syringe, the fi-ustoconical surface 45 of plunger end wall 44 moved in the part 59 that broadens of central cavity 57 of syringe needle valve rod 58 with the fluid that forced any remainder before withdrawal by syringe needle (therefore reducing " extremely " space between the bonding part of plunger and needle assembly).In addition, the summit of the ring edge 80 of syringe needle valve rod 58 is bonded on or tears or separate end wall 44 from plunger 30 beginning near a part of the end wall 44 at fi-ustoconical surface 45 places.Roughly side by side, the summit of the ring edge 78 of plunger is bonded on or near a part of the stem ring 64 at its barbed portion 65 places, forces contact point place between stem ring and plunger 62 to tear or the seperating vale burr along barbed portion 65 from flange.
Plunger is pressed in the syringe fully also plunger ring edge 78 is urged to stem ring 64, thus make from the part of the stem ring of flange 62 fractures along the syringe inwall to far-end slide short distance with respect to syringe needle valve rod 58 central axial line (see figure 4)s with the minute angle orientation.In addition, prevent from not have the stem ring part of fracture to move to far-end, until it from the syringe needle valve stem crack.The breaking portion of stem ring 64 is along this slip of syringe inwall, be applied to the continuous pressure of stem ring together with the plunger that fully is pressed into, cause in both direction, constantly tearing or the stem ring that ruptures is fully separated from fin 62 until stem ring along barbed portion 65.In addition, the ring edge 80 of syringe needle valve rod 58 engages with forcing of plunger end wall 44 and causes constantly tearing in both direction or the end wall that ruptures along barbed portion 46, causes end wall to separate fully from plunger 30.Notice from plunger fracture end wall and need not the ring edge 78 of plunger and syringe needle valve rod and 80 shear action from the fin fracture stem ring of syringe needle valve rod in addition.In fact, ring edge 78 and 80 needn't form any contact realizing with barbed portion 65 and 46 and tear or rupture, because the adverse effect power that is applied by the engagement end portion surface of plunger and syringe needle valve rod is enough to realize the fully fracture of plunger end wall 44 from plunger and stem ring 64 from the syringe needle valve rod.
Injector designed was constructed such that before stem ring 64 separates fully from fin 62 immediately or with it substantially side by side, end wall 44 separates fully from plunger 30.Alternatively, syringe can be constructed such that also stem ring separated from syringe needle valve rod fin immediately fully before end wall separates fully from plunger, thereby the near-end bias voltage of needle assembly helps to force tearing fully of plunger end wall.In case stem ring separates and end wall is achieved from the separation fully of plunger fully from the fin of syringe needle valve rod, then elastomeric element 84 forces syringe needle valve rod 58 and syringe needle 60 to enter in the withdrawal cavity 48 in the plunger (seeing Fig. 5 and 6) to near-end together with end wall 44.
As seen from Figure 6, when plunger 30 fully has been pressed in the syringe 22 and the withdrawal of needle assembly 56 when taking place, the flange 39 of plunger extends to a little and prolongs in the syringe part 27 and be locked in the annular groove 29.In this latched position, can prevent to remove plunger from syringe.
An optional embodiment of syringe illustrates in Fig. 7-10 and is as described below.This syringe is being similar to the syringe of describing and illustrating in the above in Fig. 1-6 aspect design, assembling and the operability, and the similar member of identical numeral.The design that is the plunger end wall in the main difference between Fig. 1-6 syringe and Fig. 7-10 syringe, is used for the stem ring of needle assembly and before withdrawal, is used for locked needle assembly in a fixed manner along the locking protuberance/projection of syringe inner wall surface.With reference to figure 7, syringe 20 ' syringe needle valve rod 58 have radially extending flange 62 and be attached to flange 62 (preferably, stem ring is molded into the part of flange) thereby and the there radially extend the inwall that engages syringe 22 with provide at joint effectively not the stem ring 64 of saturating fluid seal '.The stem ring 64 of Fig. 7 embodiment ' gauge be a bit larger tham the stem ring 64 of front embodiment (in Fig. 1-6 signal) and have part to remote extension, this part be assembled to along the annular shoulder of syringe inner wall limit or base 21 ' in and engage.Stem ring 64 ' size also be adapted such that when syringe needle valve rod 58 is inserted in the syringe and is forced to far-end and surpasses annular shoulder 66 in the syringe, annular shoulder 66 of stem ring 64 ' closely be assemblied in and base 21 ' between to prevent any motion in syringe of before retracted needle assembly syringe needle valve rod substantially to near-end or far-end.Stem ring 64 ' and the junction point place stem ring 64 ' also of syringe needle valve rod 58 have annular incision or barbed portion 65 ', it is limited to the thin membrane that is torn during the retract syringes or ruptures or the material part of minimizing.
End wall 44 ' (end wall preferably is molded into the part of plunger herein) that is fixed on plunger 30 far-ends have annular incision of extending around the end wall periphery or barbed portion 46 ', it is limited to and is pressed into the thin membrane that is torn during the plunger or ruptures or the material part of minimizing.Towards the end wall surface 45 of needle assembly ' be substantially flat, this fi-ustoconical surface 45 with the embodiment of signal in Fig. 1-6 is opposite.Be similar to the embodiment of front, the annular surface in opposite directions 78 of plunger 30 and syringe needle valve rod 58 ' and 80 ' all with minute angle (for example, approximately 3-5 °) thus with respect to the plane perpendicular to the syringe central axial line tilt limit summit at each annular surface place in case during plunger is pressed into syringe to plunger end wall 44 ' and stem ring 64 ' exert pressure.
With reference now to Fig. 7-10 describe syringe 20 ' operation.By plunger distal end is brought into use syringe towards the suitable distance of syringe near-end displacement, so that fluid is sucked fluid cavity 50 from syringe needle.With syringe needle during as for the injection site, plunger is pressed towards distal barrel end then to force fluid flow from cavity 50 and by syringe needle.When plunger is pressed further in the syringe, the ring edge 80 of syringe needle valve rod 58 ' the summit or near end wall surface 45 ' locate engage end wall 44 ' a part with begin from plunger 30 tear or the end wall 44 that ruptures '.
Roughly side by side, plunger ring edge 78 ' the summit or near its barbed portion 65 ' locate engage stem ring 64 ' a part, force contact point place between stem ring and plunger along barbed portion 65 ' tear or the stem ring that ruptures from flange 62.Yet, be different from the embodiment of front, from the stem ring 64 of flange 62 fractures ' free part do not slide along the syringe inwall.In fact since against the base 21 of stem ring ', stem ring 64 ' this free part prevented from substantially in syringe, to move to far-end.
With plunger be pressed into fully force in the syringe continue further from flange 62 along its barbed portion 65 ' both direction, tear or the stem ring 64 that ruptures ' and from plunger 30 along its barbed portion 46 ' both direction, tear or the end wall 44 that ruptures '.In embodiment in front, syringe 20 ' be preferably designed so that make from fin 62 complete seperating vale burrs 64 ' before immediately or with it substantially side by side, end wall 44 ' separated fully from plunger 30.Alternatively, syringe can be constructed such that also before end wall is separated fully from plunger that immediately stem ring takes place from the separation fully of the fin of syringe needle valve rod, thereby the near-end bias voltage of needle assembly helps to force the plunger end wall to break fully.In case stem ring was achieved from separating fully of plunger with end wall from separating fully of the fin of syringe needle valve rod, then elastomeric element 84 forces syringe needle valve rod 58 and syringe needle, together with end wall 44 ' enter withdrawal cavity 48 in the plunger to near-end.Therefore, the Starting mode of retracted needle assembly wherein, as among the embodiment in front, need not the ring edge 78 of plunger and syringe needle valve rod ' and 80 ' shear action.
Another embodiment of syringe illustrates in Figure 11 and is described below.This syringe is being similar to above-mentioned and syringe signal in Fig. 1-6 aspect design, assembling and the operability, and the similar member of identical numeral.Yet the stem ring of Figure 11 syringe is improved a little to comprise that one or more surfaces along stem ring are from otch or the radially spaced one or more other otch of barbed portion.This other otch has strengthened stem ring tearing or rupture from the syringe needle valve rod along barbed portion.The otch (for example, one or more) of noticing any proper number can be set in any appropriate location along any one or a plurality of surface of stem ring.This otch also can extend any selected radical length (for example, 45 °, 90 °, 180 °, 360 ° etc.) with radial manner with respect to the center of stem ring.
With reference to Figure 11, stem ring 64 " near and the junction point of the flange 62 of syringe needle valve rod 58 have barbed portion 65 " and be located at stem ring 64 " the apparent surface on and in barbed portion 65 " and the stem ring periphery between be in the pair of notches part 92 and 94 of spaced radial position.Stem ring also has the groove that extends along its outer periphery surface, and it is bonded on annular shoulder 66 and protuberance 21 " between the otch 94 that is provided with along the inner surface of syringe main part 24.
Syringe 20 " assembling be similar to the assembling of said syringe and other stem ring 64 substantially " thereby the feature peripheral groove that is pushed the stem ring that puts in place in syringe cooperate with syringe projection 96.When plunger distal end engages stem ring 64 " with beginning in barbed portion 65 " locate when syringe needle valve rod 58 is torn or rupture stem ring, because stem ring is at the joint at its peripheral localized groove and syringe projection 96 places, stem ring is prevented substantially towards protuberance 21 " slide.In addition, thus notch portion 92 and 94 strengthened the flexibility of stem ring when it is contacted by plunger and further strengthened stem ring in its barbed portion 65 " fracture located.
Above-mentioned and syringe signal in the drawings can improve and not leave scope of the present invention in the mode of any number.For example, being used for the stem ring of syringe needle valve rod can be in any appropriate manner (for example, by heat or ultrasonic bonding, adhere to etc.) is fixed to the inner surface of needle cylinder wall rather than is held and form friction/compression with needle cylinder wall and closely cooperate.In such an embodiment, will can not be forced to form certain angle from the part of the stem ring that is attached to the internal needle barrel between syringe needle valve rod separation period at stem ring with respect to the syringe central axial line.Yet, separate still caused along the stem ring barbed portion in case stem ring from the syringe needle valve stem crack.
In other exemplary embodiment, the plunger end wall can be connector or barrier film, and it is frictionally assembled to engage the inner surface portion in the hollow plunger, perhaps alternatively, snaps fit onto in the one or more grooves in the hollow plunger internal table face portion.For example, with reference to Figure 12, hollow plunger 30 ' have frictionally the engage inner walls surface and be maintained at the plunger distal end place connector 44 in the plunger '.In being shown in another embodiment of Figure 13, hollow plunger 30 " have a connector 44 that is snap fit onto in the respective annular groove that is provided with along inner wall surface near plunger distal end ".In each of these embodiment, plunger membrance or connector have appropriate size and are held in place with respect to plunger between moving period in syringe at plunger.When the plunger connector engaged with the part of syringe needle valve rod, the plunger connector was from engaging oppressed with plunger this and utilizing syringe needle valve rod and syringe needle to be withdrawn into the withdrawal cavity of plunger.
Further feature also can be set between stem ring or syringe needle binding clasp and the syringe to prevent that stem ring and syringe needle binding clasp (for example rotate after assembled syringe in syringe, when the pin hub was coupled to the syringe needle binding clasp via threads engage, stem ring and syringe needle binding clasp rotatablely moved resistance).For example, stem ring/syringe needle binding clasp can be provided with groove, nicked projection and/or tooth, and when the syringe needle binding clasp was assembled in the syringe, they engaged complementary groove, otch and/or tooth in the syringe.For example, when syringe needle was connected (via threads engage) to the syringe needle binding clasp, this joint between syringe needle binding clasp and syringe prevented syringe needle binding clasp rotatablely moving in syringe.Alternatively, perhaps except tooth and groove, any other suitable complimentary engagement structure also can be set between syringe needle binding clasp and the syringe and be assembled any rotation of hour hands head binding clasp with respect to syringe to reduce or to prevent substantially fully when syringe.
Other improvement of syringe is included in the syringe proximal end cut-out is provided in the extension, wherein (that is, when a part of plunger by when syringe spurs) this cut-out provides the import of the clamping surface that arrives plunger thumb pad and flange for user during fluid is drawn to the syringe fluid cavity.For example, two or more can be along the relative cut-out of diametric(al) along prolonging the syringe part setting.Yet the cut-out of any proper number (for example, one or more) can be according to the needs of concrete application along prolonging syringe part with any suitable arrangement setting.The thumb pad that the remainder that prolongs syringe part comprises engage pistons is to be locked in plunger in mode similar to the above after using syringe in the latch recess in the syringe.
Being combined with some of above-mentioned feature and the syringe embodiment of further other feature illustrates in Figure 14-21.This syringe is being similar to above-mentioned and syringe signal in Fig. 1-6 aspect design, assembling and the operability, and additional features is described below.With reference to Figure 14, injector for medical purpose 120 has hollow cylindrical syringe 122, has opening 123 in its proximal end and size is suitable for receiving hollow plunger 130.This syringe also has opening to allow from syringe exposed needle 160 at its far-end.Syringe 122 has the main part 124 of a part that receives and keep plunger 130 and has the remote extension portion 126 of the internal diameter that reduces with respect to main part 124, and it receives needle assembly 156 as described below.At least one protuberance or convex ridge 212 are faced the wall and meditated the part setting to resist or to prevent that plunger removes fully from syringe during operating syringe along the internal table of main part 124 in syringe and near its near-end.For example, convex ridge can be successive (for example, forming outstanding annular ring) in syringe.Alternatively, a series of (for example, two or more) convex ridge can be set in the spaced radial position along inner needle cylinder surface.
Plunger 130 has near the elastic sealing element 132 of its far-end around plunger.Fluid cavity 150 is limited in the syringe 122 between the far-end 125 of other distal portions of elastic sealing element 132 and plunger and syringe main part 124, wherein the volume of fluid cavity based on plunger with respect to the axial displacement of syringe and change.The far-end that sheath 168 is fixed to syringe 122 removedly uses the syringe needle 160 that is fixed on before the syringe in the syringe to be enclosed in.In embodiment in front, the syringe of syringe, plunger, elastic sealing element, sheath and all other members can be made of any suitable medical grade material of being convenient to the syringe operability as described below (for example, plastics and/or rustless steel).And syringe can design suitable fluid cavity to satisfy the requirement (for example, 1 cubic centimetre or cc, 3cc, 5cc etc.) of concrete any fluid displacement of using.
The near-end of plunger 130 has convex surface or cheese thumb pad 138 and radially extending flange 139 so that engage user finger and/or thumb during operating syringe.Similarly, the main part 124 of syringe has the radially extending flange 128 of close its near-end setting so that engage user finger and/or thumb during operation.Prolongation syringe part 127 extends between flange 128 and syringe near-end and internal diameter is a bit larger tham the remainder of main part 124.Prolong syringe part 127 and also have enough longitudinal sizes, and internal diameter is slightly smaller than the lateral dimension of the plunger that limits at flange 139 places, thereby, when plunger 130 fully was pressed in the syringe, plunger flange 128 forced prolongation syringe part 127 to enter the prolongation syringe part at syringe proximal end slight curvature to allow flange.
With reference to Figure 15, two are removed from prolonging syringe part 127 along the relative part of diametric(al), thereby form cut-away area or part 210 along prolonging the syringe periphery.When plunger as described below by from syringe pulling when beginning to draw the fluid the syringe fluid cavity, cut-out 210 is convenient to expose the plunger thumb pad 138 of enough parts and flange 139 to help syringe user clamping plunger.Though illustrated two cut-outs, noticed that the cut-out of any proper number can be set up (for example, one or more) at any one or more select locations place along prolonging syringe part.Preferably, prolong the syringe part wall thickness and/or form the plastics of this part or other material is selected when being gripped by user with box lunch, slight elasticity and reversible deformation take place during being drawn to fluid in the syringe, further help from axially the be shifted plunger of a part of syringe thereby prolong syringe part.
Annular groove 129 is provided with along all the other inner wall section (that is the isolating wall part of cut part) that prolong syringe part near the syringe near-end.Be pressed into plunger in the syringe fully and plunger that syringe withdrawn in the time, plunger flange 139 with chucking locking relation engagement annular groove 129 to prevent removing plunger from syringe.
With reference to Figure 17, plunger 130 has the plunger distal end of being located at place and is frictionally remained on barrier film or the connector 144 that (for example, is similar to frictional engagement above-mentioned and that illustrate in Figure 12) between the plunger inner wall section.Inner or the withdrawal cavity 148 of the hollow of connector 144 sealed plungers 130, and the frictional engagement between connector and plunger is suitable for keeping connector to take place as described below with the withdrawal that engages until needle assembly of plunger.Alternatively, notice that plunger membrance or connector can be fixed on the plunger distal end place with chucking assembly relation (for example, as in the embodiment of Figure 13) or in any other suitable mode.
As shown in figure 17, the far-end of plunger 130 has and is communicated with withdrawal cavity 148 and connector 144 and is fixed to wherein opening.Internal annular wall at the plunger distal end place has the radially protuberance 141 that extends internally.As the diameter of the plunger opening that limits at protuberance 141 places or lateral cross section less than the diameter or the lateral cross section that in plunger, limit and surpass the withdrawal cavity 148 of protuberance 141.Similarly, connector 144 has from the extension 147 of connector near-end horizontal expansion.The lateral cross section size of the extension 147 of connector 144 is a bit larger tham the lateral cross section size of the plunger opening that limits at protuberance 141 places, thereby is convenient to the CONTACT WITH FRICTION between the extension 147 of protuberance 141 and connector 144.The lateral cross section size of extension 147 and connector 144 remainders is less than the lateral cross section size of the withdrawal cavity 148 between plunger protuberance 141 and plunger near-end.And the lateral cross section size of all the other plug section of extending between extension 147 and connector 144 far-ends is slightly smaller than the lateral cross section size of plunger opening.Therefore, during the retracted needle assembly, when the extension 147 of connector 144 was axially displaced from the protuberance 141 of plunger 130, the frictional engagement between plunger and connector was released and connector can be free to travel in the withdrawal cavity.
Plunger connector 144 has towards the distal barrel end extension and engage the complementary substantially spill of needle assembly 156 and the convex and the fi-ustoconical surface 145 of frustoconical cavity part 159 when plunger quilt as described below fully is pressed in the syringe.As in above-mentioned front embodiment, pointing out ground, end wall be formed with alternatively concrete application required any suitably outwards or the surface (for example, taper, convex, V-arrangement, multiaspect shape etc.) or even the smooth or flat surface that extend internally.Yet, thereby the complementary composition surface feature of plunger connector and needle assembly be preferably during fluid cavity removes fluid, reduce or the eliminate fluid cavity opening or " extremely " space.
At least one otch 146 is formed on the connector at the base portion place of fi-ustoconical surface.Otch 146 can be at fi-ustoconical surface base portion place extends around the connector periphery, perhaps alternatively, is made of independent otch or one or more separately notch portion.This otch is used for providing fluid flowing path between fluid cavity in syringe and the fluid passage in the needle assembly substantially when plunger engages needle assembly substantially or fully.In addition, the plunger connector with otch reduces or has eliminated at plunger towards the needle assembly probability that hydraulic pressure increases or raises in fluid cavity between moving period.
Thereby needle assembly 156 have syringe needle binding clasp in the remote extension portion 126 that is connected with syringe needle 160 and is fixed on syringe or valve rod 158 before using and between the operating period syringe needle 160 extend from distal barrel end.Syringe needle valve rod 158 and syringe needle 160 preferably engage via any suitable not saturating fluid and are bonded with each other releasedly.In a preferred embodiment, the discharged joint between syringe needle valve rod and syringe needle is a threads engage, and wherein the syringe needle valve rod has the convex thread structure and syringe needle has the spill screw thread coupling to connect the syringe needle valve rod releasedly.This that illustrate in Figure 14 and 17-20 is connected and is different from traditional syringe needle and connects, for example the LuerLock structure.In addition, this helicitic texture provides and being easy to of the syringe needle of all size and type, general being connected.Yet, notice syringe needle also can be any other suitable discharge or can not be coupled to the syringe needle valve rod by delivery mode.
Thereby cavity 157 axially extends to the fluid of being convenient between the fluid cavity 150 syringe needle and syringe with the junction point of syringe needle 160 from the near-end of syringe needle valve rod 158 to be communicated with.In addition, cavity 157 has the part 159 that broadens in the proximal end of syringe needle valve rod 158, thus it have truncated conical configuration and towards the syringe near-end broaden substantially aim at and with fi-ustoconical surface 145 complementations of plunger 130.Ground as noted before, when plunger was pressed towards needle assembly, the part 159 that broadens is aimed at and engaged to the fi-ustoconical surface 145 of connector 144 substantially.When the plunger connector by with to and fully engage the broadening during part 159 of needle assembly, guarantee between fluid cavity 150 and needle assembly cavity 157, to exist fluid flowing path and reduction or eliminate hydraulic any rising in fluid cavity at the otch 146 that limits on the connector 144.
Syringe needle valve rod 158 also has radially extending flange 162 in its proximal end, thereby its size is suitable for engaging along the step or the protuberance 121 of the inner surface setting of remote extension portion 126 and prevents that needle assembly exceeds protuberance 121 to distal movement during plunger is pressed to distal barrel end.
Stem ring 164 is fixed to and radially extends inner wall surface with the remote extension portion 126 that engages syringe from the flange 162 of syringe needle valve rod 158.Stem ring 164 preferably forms or is molded as part of flange 162 and syringe needle valve rod 158 and has otch or barbed portion 165 at the junction point place of stem ring 164 and syringe needle valve rod 158, and wherein this barbed portion is formed on the apparent surface of syringe needle valve rod flange and stem ring.Barbed portion 165 is limited to the material part of the barrier film that is torn during the operating syringe or ruptures or minimizing so that retracted needle assembly 156 in the following manner.Stem ring 164 preferably has certain size with when plunger is as described below when being pressed into joint pin head valve bar 158, and the breaking portion of being convenient to stem ring slides along the syringe inner wall surface is local.
In the position of stem ring joint syringe, the diameter of stem ring can be selected to and be slightly smaller than, be equal to or slightly greater than the diameter of remote extension portion 126 inner wall surface.In the present embodiment, thus the diameter that the diameter of stem ring 164 is a bit larger tham the syringe inner wall surface that engages stem ring stem ring during engaging syringe is compressed a little and is formed effectively fluid seal thoroughly.The size of stem ring also is selected at stem ring/syringe inwall compressed fit/not saturating fluid seal is provided at the interface, is convenient to stem ring simultaneously when plunger is pressed in the syringe fully and slides in the syringe inner wall surface.Alternatively, notice that stem ring can be directly connected to syringe inner wall surface (for example, via bonding, welding etc.).
Radial protrusion or annular shoulder 166 are along the near-end setting of inner surface and close distal barrel end extension 126.Shoulder 166 engages stem ring 164 to prevent needle assembly towards the motion of syringe near-end, and stem ring keeps connecting mutually with syringe needle valve rod 158 simultaneously.Elastomeric element 184 (for example, wind spring) is located between the flange 162 and inner protuberance 186 of syringe needle valve rod 158, and this protuberance is located on the inner surface of remote extension portion 126 in the position between protuberance 121 and the distal barrel end.When needle assembly 156 be press fitted in the remote extension portion 126 of syringe (as described below) thus stem ring 164 is when remote extension surpasses the radial protrusion 166 of syringe, elastomeric element 184 is compressed with the near-end bias voltage needle assembly towards syringe.
With reference to Figure 16, syringe needle valve rod and syringe have complementary projection and groove so that assembling syringe needle valve rod and restriction or prevent that the syringe needle valve rod is with respect to any rotation of syringe after assembling and during operating syringe in syringe easily.Particularly, syringe needle valve rod 158 has in the position of proximate valves burr 164 one group of projection or the tooth 200 from the outer surface horizontal expansion of syringe needle valve rod.These teeth are around the peripheral intervals of syringe needle valve rod and arrange with corresponding at remote extension portion 126 places and the complemental groove 202 that is provided with along internal needle barrel surface in position corresponding substantially and syringe protuberance 121.As seen from Figure 16, tooth 200 and complemental groove 202 are configured so that easily assembling syringe needle valve rod 150 in syringe 122, wherein rotate according to needs until these teeth suitably alignment indentation and syringe needle valve rod oppressed putting in place in the distal barrel end part when inserting in the syringe hour hands head valve pole-footing.In case syringe needle valve rod 158 is assembled in the syringe 122 and tooth 200 engagement groove 202, the syringe needle valve rod with respect to the syringe rotation (for example is prevented from during operating syringe, when connecting from the syringe needle valve rod or removing syringe needle and in plunger during the retracted needle assembly).
Alternatively, syringe can be provided with other syringe needle valve rod and syringe cylinder structure of the locking joint that is provided between syringe needle valve rod and the syringe.For example, syringe needle valve rod and syringe can have suitable complementary projection and/or groove and simultaneously limit or prevent syringe needle valve rod in syringe in the opposite direction the ratcheting that rotatablely move or cam structure along the selected degree that rotatablely moves of a direction to realize allowing the syringe needle valve rod in syringe.
In embodiment in front, syringe 120 be designed such that with plunger 130 be pressed into fully be convenient in the syringe 122 plunger connector 144 from plunger displacement also have from the flange 162 of syringe needle valve rod 158 tear or the stem ring 164 that ruptures so that syringe needle valve rod and syringe needle 160 are withdrawn into the withdrawal cavity 148.In this embodiment, the stem ring 164 of syringe needle valve rod 158 has from syringe needle valve rod proximal extension and is configured to form at least one convex ridge 172 that initially contacts with the annular distal end edge 178 of plunger syringe when plunger is shifted.Though only a convex ridge 172 is illustrated in Figure 17-20, the convex ridge of noticing any selected number can be set at any appropriate position and suitably along the near-end space towards the syringe needle valve rod of plunger.In this embodiment, convex ridge 172 as with the similar purpose of angled annular surface in embodiment above-mentioned and signal in Fig. 1-6 with summit.Yet convex ridge 172 also allows in application to remove may being compared easily from syringe at the bubble that gathers along one or more positions of syringe inwall after fluid is sucked fluid cavity before from syringe force fluid (for example being expelled to patient).The annular distal end edge 178 of plunger has the structure of substantially flat.Yet, notice that plunger distal end can have any one or a plurality of projection of similar syringe needle valve rod, perhaps alternatively, have angled profile to form as summit in embodiment above-mentioned and signal in Fig. 1-6.
Thereby plunger elastic sealing element 132 is further designed and suitably determine size and contiguous plunger distal end around the plunger location when be pressed into plunger in the syringe fully, the distal engagement of elastic sealing element and be compressed in main part 124 a little and remote extension portion 126 between the part that narrows down 190 of internal needle barrel of qualification transition portion.Elastic sealing element does not slide with respect to plunger, but compress the needle cylinder wall narrowed portion a little in the end of the plunger stroke that starts the syringe needle withdrawal, and this is used for further reducing or " extremely " space of eliminate fluid cavity 150 and any residual fluid is displaced to the syringe needle valve rod cavity 157 from fluid cavity.
Thereby the syringe needle valve rod can be assembled into convex ridge in the syringe ( or a plurality of convex ridge ) with respect to plunger distal end with any selected aligning. ( ) 、 ( ) 172/164178144158,1651641581411445648。
The assembling of syringe is to realize with the similar mode of above-mentioned other syringe embodiment.Elastomeric element 184 and then needle assembly 156 (having or do not have syringe needle 160) at first be inserted in the opening 123 of syringe 122 proximal ends, by main part 124 and enter remote extension portion 126.When the stem ring 164 of syringe needle valve rod 158 ran into the annular shoulder 166 of syringe, stem ring was by mild compression and oppressedly surpass shoulder 166 in the snap fit engagement mode to far-end.Surpass shoulder 166 in case stem ring 164 is oppressed to far-end, then needle assembly 156 is locked into place in remote extension portion 126, and elastomeric element 184 be compressed with in syringe to near-end bias voltage needle assembly.Stem ring 164 remains on and is compressed to selected degree between flange 162 and the syringe inner wall surface and fluid seal thoroughly is provided at its compressed fit contact point place with syringe effectively in this latch-up structure.
Plunger 130 extends from plunger thereby the extension of connector 147 frictionally is bonded on the distal portions (comprising connector surface 145 and otch 146) of localized plunger protuberance 141 in the open distal end place of plunger and plunger connector by plunger connector 144 being inserted in the plungers and assembled.The plunger connector can directly be inserted the plunger open distal end and be arrived its frictional fit position.In the embodiment of Figure 14-21 signal, the near-end of plunger comprises thumb pad 138 and flange 139, is independent molded or molded component.Alternatively, plunger flange and thumb lid (as in following and the embodiment that in Figure 22, illustrates) from the isolating embodiment of plunger remainder therein, plunger connector can be at first open proximal by plunger be inserted into and utilizing flange and thumb pad to be pushed in its frictional fit position before sealing this open end.
After the assembling plunger, plunger be inserted in the opening 123 of syringe 122 and by displacement axially suitably distance so that use syringe.Syringe needle 160 can be connected to syringe needle valve rod 158 (for example, via the threads engage as illustrating) in Figure 16 before needle assembly is inserted syringe 122.Alternatively, after the fixed needle valve rod, syringe needle 160 can be connected to the coupling part of syringe needle valve rod 158 in syringe.In case be fixed, after assembling, syringe needle 160 is outstanding so that use syringe from the opening of distal barrel end.
In operation, the far-end of plunger is shifted suitable distance so that fluid is sucked the fluid cavities 150 from syringe needle 160 towards the syringe near-end.When syringe needle was placed the injection site, plunger was pressed towards distal barrel end then with from cavity 150 and by syringe needle 160 force fluid.With reference to figure 17-20, when plunger was pressed further in the syringe, the fi-ustoconical surface 145 of plunger connector 144 moved in the part 159 that broadens of central cavity 157 of syringe needle valve rod 158 with the fluid that forced any remainder before withdrawal by syringe needle (so reduce between the bonding part of plunger and needle assembly " extremely " space).Otch 146 on the plunger connector provides the fluid passage so that fluid continues to flow in the central cavity 157, even when plunger surface 145 contacts the cavity part 159 that broadens substantially.In addition, the part at the annular distal end edge 178 of the convex ridge of syringe needle valve rod 158 (a plurality of) 172 initial engagement plungers is torn or the stem ring 164 that ruptures along barbed portion 165 from syringe needle valve rod 158 with beginning.Roughly side by side, the syringe needle valve rod 158 that the surface 145 of plunger connector 144 engages in the cavity part 159 that broadens, and like this towards needle assembly continue be pressed into plunger and overcome the plunger connector is remained on frictional force in the plunger, towards plunger near-end compressing plunger connector and it is entered in the withdrawal cavity 148.
Plunger is pressed in the syringe further fully plunger annular remote edge 178 is urged to other surface portion of stem ring 164, thus make from the part of the stem ring of flange 62 fractures along the syringe inwall to far-end slide short distance with respect to the central axial line of syringe needle valve rod 158 with the slight angle orientation.In addition, prevent from not have the part of the stem ring of fracture to move to far-end, until it from the syringe needle valve stem crack.The breaking portion of stem ring 164, causes constantly tearing in both direction or the stem ring that ruptures fully separates from fin 162 until stem ring along barbed portion 165 with the continuous pressure that is applied to stem ring by the plunger that fully is pressed into along this slip of syringe inwall.In addition, plunger connector 144 engages with forcing of syringe needle valve rod 158 and causes the plunger connector further to move from the frictional engagement of itself and plunger distal end protuberance 141, causes the plunger connector to break away from from plunger.Plunger elastic sealing element 132 enters needle assembly towards narrowed portion 190 mild compression of syringe inwall to force residual fluid, when plunger surface 145 engaged syringe needle valve rod 158 in the cavity part 159 that broadens, plunger connector otch 146 provided fluid flowing path for this fluid simultaneously.
The design of syringe be constructed such that stem ring 164 before plunger connector 144 breaks away from fully from plunger immediately, with it substantially side by side, perhaps separate fully from syringe needle valve rod 158 immediately after this.As shown in the series of drawing 17-20, the initially-separate of plunger connector 144 and axial displacement just in time at the initial contact between stem ring convex ridge 172 and the plunger distal end edge 178 and stem ring 164 before the local fracture of syringe needle valve rod fin 162.Yet syringe can be designed such that also initial the and local any initially-separate and the axial displacement that breaks at the plunger connector of stem ring takes place before.In case stem ring is achieved from the separation fully of syringe needle valve rod fin and local at least disengaging of the frictional engagement between plunger connector and plunger, then elastomeric element 184 forces syringe needle valve rod 158 and syringe needle 160, together with plunger connector 144, in near-end enters withdrawal cavity 148 in the plunger.
As can be as can be seen from Figure 21, when plunger 130 fully has been pressed in the syringe 122 and the withdrawal of needle assembly 156 when having taken place, the flange 139 of plunger extends to a little and prolongs in the syringe part 127 and be locked in the annular groove 129.In this blocked position, prevent that plunger is removed from syringe.
Ground as noted before has as thumb pad or lid from piston body separated components or member thereby the syringe of Figure 14-21 can be modified plunger.An exemplary embodiment is illustrated in Figure 22.Syringe 220 has and is similar to the same parts above-mentioned and signal in Figure 14-21 or the syringe 122 and the needle assembly of member substantially.Plunger has hollow body part 230, and this part has the setting of close main part far-end and is similar in the above the elastic sealing element 232 of the plunger seal of describing among the embodiment in front substantially.Thumb pad or cover 238 and have size and be suitable for being assembled to opening that limits in the proximal end of main body 230 and the plug-in unit 242 that frictionally engages with it.Thumb lid also has flange 239, this flange have than the bigger lateral cross section size of plug-in unit 242 and when plug-in unit engages in plunger in abutting connection with the plunger near-end.Flange 239 also provides clamping surface as plunger and engage the gradually cusp edge that prolongs the annular groove 129 in the syringe part 127 when plunger fully is pressed into and is locked in the syringe during using syringe.
Plunger connector 244 is with in the opening that is similar to the mode of describing among the embodiment in front substantially and is frictionally remained on the plunger distal end place.Yet connector 244 is different from the plunger connector of front embodiment, and this is that it has the distal surface 245 of substantially flat or planar shaped, and otch 247 is provided with along this surface.The part of the cavity part 159 that broadens of the flat surfaces 245 joint pin head valve bars 158 of connector 244, and otch 247 is used for raising with the hydraulic pressure that is reduced in the syringe cavity during causing the syringe needle withdrawal towards the needle assembly axially-movable at plunger.
She Ji plunger allows easily to assemble the plunger connector by this way.Particularly, before connecting thumb lid 238 and main body, connector 244 can be inserted in the piston body 230 at the open proximal place.Can force the plunger connector to form frictional engagement at piston body open distal end place, subsequently thumb be covered the opening that plug-in unit 242 is inserted in the plunger proximal end by plunger withdrawal cavity 248.Thumb lid 238 (for example, via binding agent, welding etc.) in any appropriate manner is fixedly secured to main body 230 to prevent removing the thumb lid from main body after assembling.In case plunger is assembled in the syringe 122, syringe 220 is to operate so that single uses and the syringe needle withdrawal with the basic similarly mode of the embodiment above-mentioned and front of signal in Figure 14-21.
The invention is not restricted to above-mentioned syringe embodiment and have additional features.For example, the syringe coloud coding that also can have a needle cover that is used for syringe needle binding clasp and coupling is with corresponding to concrete application.Particularly, the coupling coloud coding can be selected to meet ISO 6009 and/or any other selected coloud coding standard.
Thereby the elastic sealing element of plunger also can be modified the sealing member of a part to be extended on the segment distal at least of plunger.Elastic sealing element also can have opening to hold and frictionally to keep the plunger connector of a part as described in some embodiment in front.Being provided at the elastic sealing element that extends on the plunger distal end has by this way also reduced otherwise may be present in potential " extremely " space in the syringe fluid cavity.
An exemplary embodiment with syringe of the plunger elastic sealing element that centers on the plunger distal end extension is illustrated in Figure 23.The syringe embodiment of Figure 23 is similar to syringe above-mentioned and that illustrate in design and operating aspect in Figure 14-21, its difference is plunger elastic sealing element 132 ' the have far-end 302 that extends on plunger 130 far-ends.Elastic sealing element 132 ' far-end 302 have also that size is suitable for receiving and the opening of engage pistons connector 144 frictionally.In this embodiment, the plunger connector frictionally engages the far-end protuberance of elastic sealing element and plunger, and during syringe needle withdrawal plunger connector and elastic sealing element and plunger the motion fully that frictionally engages within plunger or be overcome when being pressed in the syringe.Opening in the plunger seal also has enough sizes and passes through plunger seal with the syringe needle stem movement that allows to have syringe needle during the syringe needle withdrawal.
Thereby the syringe of illustrating in Figure 23 can be modified the plunger connector and frictionally engage in elastic sealing element and the plunger only one.In another improved syringe of Figure 23, stem ring convex ridge 172 ' have towards plunger distal end and when plunger moves in the syringe fully, engage elastic sealing element far-end 302 point or sharpened edge.Elastic sealing element 132 ' reduce substantially or prevent when plunger fully is pressed in the syringe " extremely " space that in fluid cavity, exists.
Ground as noted before, the plunger connector also can be held with chucking or releasably locking structure with respect to one or more parts of plunger, thus wherein when fully or fully be pressed in the syringe plunger this snap-fit arrange that being overcome the plunger connector can move to the syringe needle valve rod in the cavity of withdrawing.Projection that can be by any proper number (for example, one or more) is provided on one or two of plunger and plunger connector and/or complemental groove and realize that this snap-fit or releasably locking arrange.
With reference to Figure 24, above-mentioned and plunger syringe that illustrate in Figure 14-21 is modified to have the one or more projectioies that are used for during use and before the syringe needle withdrawal locking of plunger connector put in place.Particularly, the close plunger distal end of plunger 130 ' have and from the radially protuberance 141 that extends internally the radial protrusion that extends internally 320 to the near-end setting.When plunger connector 144 was fixed in the distal openings of plunger, projection 320 was in abutting connection with the extension 147 of plunger connector and prevent from moving to near-end the withdrawal cavity with the fluid inhalation syringe with fluid plunger connector during syringe penetrates.Yet when plunger was pressed into fully or move in the syringe, the contact between plunger connector and syringe needle valve rod forced connector extension 147 to surpass convex ridge 320, and this allows the plunger connector to be withdrawn in the withdrawal cavity 148 with syringe needle valve rod and syringe needle.
A similar embodiment illustrates that in Figure 25 wherein the syringe of Figure 23 is modified to have and is clasped or locking member between plunger connector and plunger.Particularly, plunger 130 ' the have radial protrusion of in the embodiment of Figure 24, describing as the front that extends internally 320.In addition, outward extending radially protuberance of plunger connector 144 ' have or projection 400, it is configured to engage along elastic sealing element 132 " the corresponding radial groove 402 that is provided with to inner surface.Projection 400 arranges that with the locking that is clasped engagement groove 402 is forced into until connector joint pin head valve bar and with the syringe needle valve rod in the withdrawal cavity 148 with respect to plunger motion further to prevent the plunger connector.
This syringe also can be designed to have the needle locking feature to prevent during using syringe from the syringe needle valve rod or binding clasp removes accidentally or the releasing syringe syringe needle.For example, syringe needle is fixed among the embodiment of syringe needle binding clasp removedly via threads engage therein, this needle locking feature prevents the careless separation between syringe needle and syringe needle binding clasp, otherwise may be because when needle cover or twist syringe needle with respect to the syringe needle binding clasp immodestly when sheath is removed from syringe and/or other twisting resistance is applied to syringe needle by user during injector operations this separation takes place.
The needle locking feature can be by providing the corresponding latch recess with at least one of at least one projection to be achieved on the convex of syringe needle binding clasp and syringe needle and spill screw thread coupling in syringe above-mentioned and signal in Figure 14-21.With reference to figure 26A and 26B, the improvement embodiment of the syringe of sketch map 14-21, wherein the syringe needle valve rod 158 of needle assembly ' the have convex helicitic texture of the respective concave screw thread coupling 400 that is releasably connected to syringe needle 160.As seen from Figure 26 A, syringe needle valve rod 158 ' the convex threaded portion radially extend and the coiling valve rod from valve rod.The convex threaded portion also has from the initial or guiding-part 402 of syringe needle valve rod outward radial inclination, realizes the final radial dimension of convex threaded portion until its.Groove or otch 406 are located on the leader 402 of syringe needle valve rod convex threaded portion, and wherein otch 406 laterally extends through this leader.Corresponding protuberance or projection 408 are located on the spill threaded portion 404 of adapter 400.
Thereby otch and projection have appropriate size and aim on each of needle assembly that is used for syringe needle and spill screw thread coupling when engaging convex screw needle head assembly and spill screw thread coupling substantially fully for syringe needle, and projection 408 slides in the otch 406 and engages so that the releasably locking joint to be provided between needle assembly and syringe needle.Particularly, projection 408 is ridden the initial tilt that leans against guiding-part 402 and is partly gone up until it and run into and engage otch 406.This locking engage to resist that be applied to syringe needle slight refused with careless turning round or twisting resistance (for example, during removing sheath 168 from syringe) and can being overcome with respect to needle assembly when syringe needle applies sufficient twisting resistance.
Alternatively, projection and/or groove can have multiaspect shape and/or inclined surface so that the locking action of ratchet-type, wherein syringe needle with respect to needle assembly along first direction (for example, clockwise direction) rotation is threaded with joint convex and spill and is relatively easily promoted to utilize the fixed projection of rabbeted lock, and syringe needle is resisted by the joint of projection in groove with respect to reverse (for example, counterclockwise) of needle assembly along the second direction opposite with first direction.In addition, sheath also can be designed to prevent that sheath reverses with respect to injector syringe during removing sheath, thereby further alleviates or prevent syringe needle reversing accidentally with respect to needle assembly.
During the needleless that also can be configured to other according to syringe of the present invention is used (that is, not comprising the application of the use of syringe needle).For example, syringe of the present invention can be configured to have suitable adapter with direct connection intravenous (IV) fluid line with fluid from injector to inject to the IV pipeline.The withdrawal of syringe needle valve rod can prevent the further use of syringe after the injection of single fluid.
Though at length and with reference to its specific embodiment described the present invention, those skilled in the art can know under the prerequisite that does not deviate from its spirit and scope can make various changes and modification.Therefore, the present invention is intended to contain modification of the present invention and the change in the scope that belongs to the claims and the equivalent form of value thereof.

Claims (23)

1. syringe comprises:
Hollow syringe has opening in the syringe proximal end, at the opening at distal barrel end place be located at fluid chamber in the syringe;
Hollow plunger, via proximal openings extend in the syringe and can be in syringe towards with axially move away from distal openings, wherein this plunger has during the opening part of being located at the plunger distal end place is fixed to plunger releasedly and is using syringe and can move so that arrive the end wall of the withdrawal cavity of being located at the plunger from the plunger distal end opening; With
Be fixed in the distal barrel end and be positioned at the needle assembly at this place, this needle assembly has the syringe needle binding clasp, towards the elastomeric element of syringe proximal openings bias voltage syringe needle binding clasp, with the holding member that is fixed to the syringe needle binding clasp via the material part that reduces releasedly, thereby wherein this syringe needle binding clasp has adapter and allows syringe needle to extend through the distal openings of syringe syringe needle is fixed to the syringe needle binding clasp;
Wherein plunger, holding member and syringe needle binding clasp are constructed such that holding member overcomes the bias voltage maintenance syringe needle binding clasp of elastomeric element at the distal barrel end place, and when plunger fully is pressed in the syringe, thereby plug engages syringe needle binding clasp breaks away from along the material part that reduces from the syringe needle binding clasp and separates the syringe needle of being convenient to end wall, syringe needle binding clasp and being fixed to the syringe needle binding clasp and be withdrawn into the cavity of withdrawing to force the plunger end wall and enter in the plunger and to force holding member.
2. according to the syringe of claim 1, wherein plunger and needle assembly also are formed at and are convenient to the initially-separate of holding member from the syringe needle binding clasp when plunger distal end contacts at least one part of holding member, this contact is used for constantly separating from the syringe needle binding clasp along the material part that reduces with this at least one part that causes holding member towards this at least one part of distal barrel end compressing holding member, and another part at least of holding member keeps being attached to the syringe needle binding clasp and be prevented from towards distal barrel end move until this at least another part separate from the syringe needle binding clasp.
3. according to the syringe of claim 1, wherein this holding member comprises the retaining ring that is provided with around the near-end of syringe binding clasp, and the material of this minimizing partly is included at least one the annular barbed portion that limits between retaining ring and the syringe binding clasp.
4. according to the syringe of claim 3, wherein this retaining ring has at least one projection of extending from towards the surface of the retaining ring of plunger, and plunger and needle assembly also are configured to when combining with the motion of plunger towards distal barrel end, during at least one bump bonds plunger distal end of retaining ring, cause that retaining ring constantly separates along annular barbed portion from the syringe needle binding clasp.
5. according to the syringe of claim 1, wherein this plunger end wall is included in the frictionally connector of engage pistons of plunger distal end opening part, and this connector is constructed such that when towards the distal barrel end depression of plunger, and this connector joint pin head binding clasp is so that connector breaks away from and the syringe needle being convenient to connector, syringe needle binding clasp and being fixed to the syringe needle binding clasp is withdrawn into the withdrawal cavity from plunger.
6. according to the syringe of claim 1, wherein this plunger end wall is fixed to plunger distal end releasedly via the material part that reduces, and plunger is constructed such that when proper plunger fully is pressed in the syringe, and the material along the minimizing that end wall is connected to plunger partly breaks away from separating and being convenient to thus end wall, syringe needle binding clasp and the syringe needle that is fixed to the syringe needle binding clasp are withdrawn into the withdrawal cavity plug engages syringe needle binding clasp from the syringe needle binding clasp to force the plunger end wall.
7. according to the syringe of claim 1, wherein this syringe has at least one projection of extending from the inner surface portion of syringe to engage and to prevent that holding member and syringe needle binding clasp from moving towards the syringe near-end before beginning that the syringe needle binding clasp is withdrawn into the withdrawal cavity.
8. according to the syringe of claim 1, wherein this plunger has flange at the plunger distal end place, and syringe has the extension with when plunger fully is pressed in the syringe in the syringe proximal end, prevents that plunger is axially displaced from syringe thereby receive plunger flange after the syringe needle binding clasp being withdrawn into the withdrawal cavity.
9. syringe according to Claim 8, thus comprise that also the locking device of being located in the syringe extension prevents that with engage pistons flange when plunger fully being pressed in the syringe and be withdrawn into the syringe needle binding clasp in the withdrawal cavity plunger near-end from moving from syringe.
10. syringe according to Claim 8, wherein this syringe extension has at least one cut-out to expose the inside of syringe extension at the cut-out place.
11. according to the syringe of claim 1, wherein syringe needle binding clasp and syringe have the complementary standing part that is bonded with each other with restriction syringe needle binding clasp rotatablely moving with respect to syringe when the syringe needle binding clasp is fixed in the syringe.
12. syringe according to claim 11, wherein should the complementation standing part comprise the projection of extending from the outer surface part of syringe needle binding clasp and the corresponding recesses that is provided with along the inner surface portion of syringe, and should projection and groove when the syringe needle binding clasp is fixed in the syringe, be bonded with each other to prevent syringe needle binding clasp rotatablely moving with respect to syringe.
13. according to the syringe of claim 1, wherein the near-end of this plunger end wall and syringe needle binding clasp has at plunger towards complimentary engagement surface that distal barrel end was bonded with each other between moving period.
14. according to the syringe of claim 13, wherein the composition surface of plunger end wall is convex and the composition surface syringe needle binding clasp is a spill.
15. according to the syringe of claim 14, wherein the plunger end wall has at least one otch that close composition surface is provided with.
16. according to the syringe of claim 1, wherein this plunger has around the sealing member that extends and be configured to the degree of selecting towards the compression of syringe inner wall section near the part of the plunger of plunger distal end when be pressed into plunger in the syringe fully.
17. according to the syringe of claim 1, wherein the convex of this syringe needle binding clasp adapter with the respective concave screw thread coupling that connects the syringe needle be fixed to the syringe needle binding clasp is threaded.
18. according to the syringe of claim 1, wherein this plunger has the lid in the opening that is fixed on the plunger proximal end, and when described lid was fixed in the proximal openings, described lid had the flange that contiguous plunger near-end is provided with.
19. the syringe according to claim 1 also comprises:
Around the sealing member that the part of the plunger at plunger distal end place is provided with, wherein the sealing part also extends on plunger distal end at least partly.
20. syringe according to claim 1, wherein the end wall of this plunger is fixed to plunger releasedly via at least one projection, and this projection is located at least one complemental groove of going up and engage on another that be located at plunger and end wall of plunger and end wall.
21. the syringe according to claim 1 also comprises:
Be fixed to syringe needle syringe needle is fixed to releasedly the needle connector of the adapter of syringe needle binding clasp, wherein this needle connector and syringe needle binding clasp adapter comprise have at least one projection and the complimentary engagement part of corresponding recesses that is bonded with each other when needle connector are fixed to the syringe needle binding clasp.
22. a syringe comprises:
Hollow syringe has opening in the syringe proximal end, at the opening at distal barrel end place be located at fluid chamber in the syringe;
Hollow plunger, via proximal openings extend in the syringe and can be in syringe towards with axially move away from distal openings, wherein this plunger has during the opening part of being located at the plunger distal end place is fixed to plunger releasedly and is using syringe and can move to be convenient to arrive the end wall of the withdrawal cavity of being located at the plunger thus from the plunger distal end opening; With
Be fixed in the distal barrel end and be positioned at the needle assembly at this place, this needle assembly has the syringe needle binding clasp, towards the elastomeric element of syringe proximal openings bias voltage syringe needle binding clasp with the bias voltage that is used for the overcoming elastomeric element fixture of fixed needle binding clasp releasedly at the distal barrel end place;
Wherein:
This plunger distal end and fixture are constructed such that proper when fully being pressed into plunger in the syringe, fixture has the first that is constantly torn and be pressed towards distal barrel end from the syringe needle binding clasp, and another part at least of fixture be prevented from towards distal barrel end move until first after the syringe needle binding clasp is torn this at least another part torn from the syringe needle binding clasp; With
In the first of fixture with another part is when the syringe needle binding clasp is torn fully at least, plunger end wall, syringe needle binding clasp and the syringe needle that is fixed to the syringe needle binding clasp are urged in the withdrawal cavity by elastomeric element.
23. a method of using syringe, this instrument used for injection be just like this type, promptly it have the opening that is included in the syringe proximal end, at the opening at distal barrel end place be located at the hollow syringe of the fluid chamber in the syringe; Hollow plunger, it extend in the syringe via proximal openings and can be in syringe towards with axially move away from distal openings, this plunger has the end wall that is fixed to plunger at the opening part of being located at the plunger distal end place releasedly; Be fixed in the distal barrel end and be positioned at the needle assembly at this place, this needle assembly has the syringe needle binding clasp, towards the elastomeric element of syringe proximal openings bias voltage syringe needle binding clasp, be fixed to the holding member of syringe needle binding clasp releasedly and be fixed to the syringe needle of syringe needle binding clasp via the material part that reduces; This method comprises:
By impelling by the syringe needle draw fluid towards syringe near-end mobile plunger far-end and it being entered in the fluid cavity in the syringe;
By impel the fluid cavity from syringe to extract the fluid of being drawn towards distal barrel end mobile plunger far-end; And
In the withdrawal cavity that impels the syringe needle binding clasp to be withdrawn into when plunger moves in the syringe fully to limit in plunger, thereby wherein this plunger is configured to when plunger moves in the syringe fully joint pin head binding clasp plunger end wall and is forced in the plunger and holding member is forced to partly to break away from from the syringe needle binding clasp along the material that reduces and separates so that end wall, syringe needle binding clasp and the syringe needle that is fixed to the syringe needle binding clasp are withdrawn into the cavity of withdrawing.
CN2005800426643A 2004-10-14 2005-10-14 Safety medical syringe with retractable needle Active CN101128232B (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US61813704P 2004-10-14 2004-10-14
US60/618,137 2004-10-14
US62691604P 2004-11-12 2004-11-12
US60/626,916 2004-11-12
US65770005P 2005-03-03 2005-03-03
US60/657,700 2005-03-03
PCT/US2005/036535 WO2006044390A2 (en) 2004-10-14 2005-10-14 Safety medical syringe with retractable needle

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CN101128232B CN101128232B (en) 2011-06-08

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103079614A (en) * 2010-07-22 2013-05-01 贝克顿·迪金森公司 Dual chamber syringe with retractable needle
CN103079615A (en) * 2010-07-22 2013-05-01 贝克顿·迪金森公司 Dual chamber syringe with retractable needle
CN103764208A (en) * 2011-03-07 2014-04-30 米德兰医药设备控股公司 Retractable syringe with segmented retaining ledge
CN104470558A (en) * 2012-04-10 2015-03-25 卡贝欧洲有限公司 Infusion device
US9550030B2 (en) 2010-07-22 2017-01-24 Becton, Dickinson And Company Dual chamber syringe with retractable needle

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US4973308A (en) * 1987-05-22 1990-11-27 Ramon M. Rovira Injection syringe with mechanism preventing reuse
US5324265A (en) * 1993-10-20 1994-06-28 Gabbard Murray Gabbard Inc. Hypodermic safety syringe with retracting needle system
US5405327A (en) * 1994-07-29 1995-04-11 Chen; Long-Hsiung Simplified safety syringe with retractable self-biased needle and minimized plunger
US5632733A (en) * 1995-05-11 1997-05-27 Shaw; Thomas J. Tamperproof retractable syringe
US5935104A (en) * 1998-08-21 1999-08-10 Safety Medical Manufacturing, Incorporated Safety medical syringe with retractable needle

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9550030B2 (en) 2010-07-22 2017-01-24 Becton, Dickinson And Company Dual chamber syringe with retractable needle
US9452268B2 (en) 2010-07-22 2016-09-27 Becton, Dickinson And Company Dual chamber syringe with retractable needle
US11426533B2 (en) 2010-07-22 2022-08-30 Becton, Dickinson And Company Dual chamber syringe with retractable needle
US10549050B2 (en) 2010-07-22 2020-02-04 Becton, Dickinson And Company Dual chamber syringe with retractable needle
CN103079614B (en) * 2010-07-22 2015-06-17 贝克顿·迪金森公司 Dual chamber syringe with retractable needle
CN103079615B (en) * 2010-07-22 2015-11-25 贝克顿·迪金森公司 With can the double-chamber syringe of retracting type pin
CN103079615A (en) * 2010-07-22 2013-05-01 贝克顿·迪金森公司 Dual chamber syringe with retractable needle
US10525207B2 (en) 2010-07-22 2020-01-07 Becton, Dickinson And Company Dual chamber syringe with retractable needle
CN105169527A (en) * 2010-07-22 2015-12-23 贝克顿·迪金森公司 Dual Chamber Syringe With Retractable Needle
CN103079614A (en) * 2010-07-22 2013-05-01 贝克顿·迪金森公司 Dual chamber syringe with retractable needle
CN105169527B (en) * 2010-07-22 2019-07-12 贝克顿·迪金森公司 Double-chamber syringe with retractable needle
CN103764208B (en) * 2011-03-07 2016-03-23 米德兰医药设备控股公司 There is the retractable syringe that segmentation keeps protuberance
CN103764208A (en) * 2011-03-07 2014-04-30 米德兰医药设备控股公司 Retractable syringe with segmented retaining ledge
CN104470558B (en) * 2012-04-10 2017-08-15 卡贝欧洲有限公司 Injection device
CN104470558A (en) * 2012-04-10 2015-03-25 卡贝欧洲有限公司 Infusion device

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CN101128232B (en) 2011-06-08

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