referring to fig6 a - 6c , a safety syringe embodiment is depicted wherein a luer adaptor allows for convenient switching between a direct needle injection configuration — and a luer adaptor injection configuration wherein the needle remains safety contained . referring to fig6 a , a glass syringe body ( 32 ) is shown with a plunger ( 6 ) inserted therein . the distal portion of the body ( 32 ) is coupled to a luer adaptor coupling member ( 48 ), which is removably coupled to a luer adaptor member ( 46 ), the distal portion of which comprises a luer interface ( 14 ) for luer style injection coupling as described above . fig6 b shows a cross sectional view wherein in the luer configuration with the luer adaptor member intact , as illustrated in fig6 a , the needle member ( 38 ) is safely contained within a lumen or passageway formed through the distal portion ( 34 ) of the syringe body ( 32 ) for a luer - configuration injection fitting without using the needle ( 38 ). a luer fitting ( 36 ) is bonded , such as with an adhesive , to the distal portion ( 34 ) of the syringe body ( 32 ) to provide a threaded interface for coupling the luer adaptor ( 46 ) to the syringe body ( 32 ). in the event that conversion to needle injection is desired , an operator may manually apply a twisting load to the luer adaptor ( 46 ), thereby utilizing the threads of the luer adaptor ( 46 ) to controllably break or fracture a frangible interface between the luer adaptor ( 46 ) and the luer adaptor coupling member ( 48 ), which is fixedly attached to the luer fitting ( 36 ) and therefore to the syringe body ( 32 ). thus such a twisting motion allows for controlled removal of the luer adaptor ( 46 ), and therefore exposure of the needle ( 38 ) for direct needle injection . when remaining in the luer coupling configuration , such as is shown in fig6 a and 6b , a tapered fluid seal ( 40 ) seals the interface between luer adaptor ( 46 ) and syringe body ( 32 ) distal portion ( 34 ). referring to fig6 c , a partially exploded orthogonal view of a configuration such as is shown in fig6 a and 6b is depicted , also illustrating that this safety syringe configuration includes a needle ( 38 ) which is coupled to the distal portion of the syringe body ( 32 ) ( and held in place and sealed by a grommet member 44 ) until the plunger ( 6 ) is fully inserted into the syringe body , wherein a needle - mating fitting on the plunger couples to the needle holder structure ( 42 ) and is configured to withdraw the needle ( 38 ) back into the body ( 32 ) of the syringe upon withdrawal of the plunger ( 6 ) relative to the syringe body ( 32 ). fig7 a - 7c illustrate a similar configuration to that depicted in fig6 a - 6c , with the exception that the syringe body ( 54 ) comprises a polymeric material into which geometric features may be more easily formed as compared with glass . as shown in fig7 c , the embodiment of fig7 a - 7c features a luer fitting ( 56 ) that may be formed into the distal portion of the syringe body ( 54 ) so that a separate luer fitting ( such as element 36 in fig6 a - 6c , which may be bonded to a glass syringe body distal portion as described above ) is not required . as shown in fig7 b , the luer adaptor coupling member ( 52 ) may be mounted directly to the luer fitting ( 56 ), and may be removably coupled to the luer adaptor ( 50 ) via a frangible coupling interface that may be controllably broken or released with relative motion , as described above . referring to fig8 , configurations such as those described in reference to fig6 a - 7c may be utilized in operation to provide an assembly having a controllably removable luer adaptor ( 60 ). the assembly may be prepackaged in kits with a precision amount of medication or other fluid measured into the volume between the plunger and syringe body such that a full insertion of the plunger always receives a predicted and premeasured amount of the medication or other fluid . for example , in one embodiment , pre - measured assemblies are available in varieties of medications at 5 milliliter intervals . the healthcare provider may decide upon infusion via either needle or luer coupling ( 62 ), and then the assembly may be transformed appropriately : with needle injection ( 64 ) the luer adaptor may be removed at the frangible coupling with the coupling member to expose the injection needle and allow for direct injection of the injection target ( i . e ., a muscle , etc ); with luer injection ( 66 ), the distal luer interface may be utilized for simple luer coupling while the needle remains in place , protected and unexposed from the operator within the housing provided by the intact luer adaptor and other portions of the assembly , as shown , for example , in fig6 a - 7c . injection may be completed by advancing the plunger relative to the syringe body ( 68 ), and with the safety syringe style needle coupling to the plunger upon full insertion of the plunger , the needle may be retracted back into a protected configuration , wherein it is at least partially housed within the syringe body ( 70 ). referring to fig9 a - 9c , a configuration similar to that of fig6 a - 6c is depicted , with the exception that a removable adaptor coupling jacket ( 78 ) has been coupled and fitted around the decouplable junction between the luer adaptor ( 46 ) and the luer adaptor coupling member ( element 48 in fig6 a , for example ) to bolster this removable coupling and ensure that it does not become accidentally uncoupled . to controllably decouple the luer adaptor ( 46 ) from the luer adaptor coupling member , first the removable adaptor coupling jacket ( 78 ) must be removed , after which the luer adaptor ( 46 ) may be twisted off , breaking the frangible coupling interface between it and the luer adaptor coupling member . in the depicted embodiment , the removable adaptor coupling jacket ( 78 ) comprises a manipulation tab ( 82 ) configured to allow an operator to pull along a pre - biased tearing or perforation pattern ( 80 ) to controllably release the jacket ( 78 ), which may comprise a polymeric material such as polyethylene or heat shrink tubing material . fig9 c illustrates an exploded view of a configuration such as that featured in fig9 a and 9b . referring to fig1 , a process embodiment similar to that of fig8 is depicted , with the exception that in a needle injection configuration ( 72 , 74 ), prior to decoupling the luer adaptor from the remainder of the syringe assembly , the adaptor coupling jacket is removed by the operator . referring to fig1 a - 14 , various configurations are illustrated that are applicable not only to configurations such as those described in reference to fig1 a - 10 , but also to various other styles of safety syringes involving needle member retraction after plunger insertion , with or without luer adaptor configurations . referring to fig1 a - 12g , in one embodiment , after full insertion of a plunger assembly ( 84 ) relative to a syringe body / needle assembly ( 88 ), an intentional misalignment or shim member ( 86 ) may be provided at the mechanical interface between the needle and the plunger that causes the needle member ( 85 ) to reorient itself away from the axis of previous insertion when the plunger is fully withdrawn , thereby allowing the needle member ( 85 ) to have axial freedom of motion . referring to fig1 b , the shim member ( 86 ) may comprise a portion of elastomeric material formed from an interruption in the geometry of a forward - oriented portion ( 96 ) of the plunger seal ( 94 )— as shown in fig1 b wherein the shim member ( 86 ) comprises a flapped over portion that will be compressed and biased to re - orient the needle member when the plunger shaft ( 90 ) is inserted to a full insertion position relative to the syringe body ( 92 ). fig1 a - 12g show a sequential progression . referring to fig1 a , a full syringe is ready for injection . fig1 b shows partial insertion of the plunger shaft ( 90 ), while fig1 c shows full insertion of the plunger shaft ( 90 ) and thereby coupling of the plunger assembly to the needle assembly ( for example , as described above )— with the shim member ( 86 ) in compression and biased to misalign the needle relative to the axis of insertion should the needle member be free to deflect / reorient . fig1 d shows partial retraction with the needle still following along the axis of needle insertion by virtue of the mechanical constraints of the distal syringe body componentry ; fig1 e shows that the shim member remains in compression , biased to reorient the needle should the needle have less constraint . referring to fig1 f , with the end of the needle withdrawn fully past the end of the constraining syringe body structure , the shim member ( 86 ) causes the needle to reorient and stay reoriented , so that even with insertion forces applied against the plunger shaft , the needle generally will be biased to stay within the safe confines of the syringe body , as shown . fig1 g illustrates a similar configuration for a shorter needle member . the configuration of fig1 f is approximately illustrative of a 30 mm long needle reoriented by 6 degrees ; the configuration of fig1 g is approximately illustrative of a 10 mm long needle reoriented by 12 degrees . in one embodiment , it is desirable for a reorienting element that has a relatively low spring constant such that it will work to reorient both long and short needles into configurations such as those depicted in fig1 f and 12g . referring to fig1 a - 13c , a cantilever bending reorientation member ( 102 ) coupled to the needle member or plunger member ( in the depicted embodiment , coupled to the needle member ) may serve a similar purpose as the shim member ( element 86 ) of fig1 a - 12g . a partial safety syringe assembly ( 98 ) is shown in fig1 a , and close - up in fig1 b and 13c to illustrate that upon coupling / interfacing of a plunger assembly ( 100 ) and a needle assembly ( needle holder 42 and interfacing grommet 44 are shown ), such as by full insertion of the plunger assembly relative to a syringe body ( not shown ), the cantilever bending reorientation member ( 102 ) may be placed into bending , as shown in fig1 c , such that upon full withdrawal of the plunger assembly and now - intercoupled needle assembly past the orientation constraints which may be associated with the syringe body or housing , stored energy in the bent cantilever bending reorientation member ( 102 ) will cause the needle member to reorient and generally become resistant to further insertion back out of the syringe body , in a similar manner as illustrated in fig1 f and 12g for the shim member configuration . the spring constant of the reorienting member may be modulated by changing not only the material comprising such element , but also the geometry ( i . e ., length , cross sectional shape , cross sectional area versus length , etc ). for example , in one embodiment with an elastomeric compression reorienting member ( 86 ), a pyramidal cross sectional geometry may be utilized to produce a nonlinear profile of bending / reorienting loading which does not significantly interfere with plunger insertion or needle capture . referring to fig1 , a process embodiment similar to that shown in fig1 is depicted , with the addition that upon retraction of the needle past the distal alignment constraints , such as those which may be provided by the syringe body , the needle is “ canted ” or reoriented so that it will be prevented from re - exiting the syringe body . referring to fig1 a - 15c , another embodiment of a luer adaptor member ( 112 ) suitable for use with configurations such as those shown in fig6 a and 7a ( i . e ., in replacement of adaptors 46 and 50 , respectively ), for example , is illustrated in three views . this embodiment ( 112 ) comprises a flange ( 114 ) configured to be protective of the fingers of an operator when the adaptor member ( 112 ) is being re - coupled to the syringe assembly , such as in a configuration as described below in reference to fig1 . referring to fig1 , a process embodiment somewhat similar to that shown in fig1 is depicted , with a filling process before usage . as shown in fig1 , an assembly of a safety syringe coupled to a luer adaptor is provided ( 104 ). the adaptor coupling jacket may be removed ( 106 ), along with the luer adaptor ( 108 ) so that the syringe may be filled using the conventional technique of inserting the needle into a medicine vial and pulling back the plunger . in one embodiment the plunger should not be fully inserted before withdrawal so that the needle does not become coupled to the plunger and withdrawn into the syringe body prematurely before the remaining steps outlined herein . with the syringe filled with the appropriate fluid ( 108 ), the luer adaptor may be re - coupled to the syringe assembly to again isolate the needle member ( 110 ); in one embodiment a flanged luer adaptor , such as that illustrated in fig1 a - 15c , may be utilized to assist with protecting the fingers of the operator during such re - coupling step . at such point , with a filled syringe and luer adaptor in place , the steps are similar to those described in reference to fig1 , with the exception that the adaptor coupling jacket has already been removed ( element 106 — described above ). various exemplary embodiments of the invention are described herein . reference is made to these examples in a non - limiting sense . they are provided to illustrate more broadly applicable aspects of the invention . various changes may be made to the invention described and equivalents may be substituted without departing from the true spirit and scope of the invention . in addition , many modifications may be made to adapt a particular situation , material , composition of matter , process , process act ( s ) or step ( s ) to the objective ( s ), spirit or scope of the present invention . further , as will be appreciated by those with skill in the art that each of the individual variations described and illustrated herein has discrete components and features which may be readily separated from or combined with the features of any of the other several embodiments without departing from the scope or spirit of the present inventions . all such modifications are intended to be within the scope of claims associated with this disclosure . any of the devices described for carrying out the subject diagnostic or interventional procedures may be provided in packaged combination for use in executing such interventions . these supply “ kits ” may further include instructions for use and be packaged in sterile trays or containers as commonly employed for such purposes . the invention includes methods that may be performed using the subject devices . the methods may comprise the act of providing such a suitable device . such provision may be performed by the end user . in other words , the “ providing ” act merely requires the end user obtain , access , approach , position , set - up , activate , power - up or otherwise act to provide the requisite device in the subject method . methods recited herein may be carried out in any order of the recited events which is logically possible , as well as in the recited order of events . exemplary aspects of the invention , together with details regarding material selection and manufacture have been set forth above . as for other details of the present invention , these may be appreciated in connection with the above - referenced patents and publications as well as generally known or appreciated by those with skill in the art . for example , one with skill in the art will appreciate that one or more lubricious coatings ( e . g ., hydrophilic polymers such as polyvinylpyrrolidone - based compositions , fluoropolymers such as tetrafluoroethylene , hydrophilic gel or silicones ) may be used in connection with various portions of the devices , such as relatively large interfacial surfaces of movably coupled parts , if desired , for example , to facilitate low friction manipulation or advancement of such objects relative to other portions of the instrumentation or nearby tissue structures . the same may hold true with respect to method - based aspects of the invention in terms of additional acts as commonly or logically employed . in addition , though the invention has been described in reference to several examples optionally incorporating various features , the invention is not to be limited to that which is described or indicated as contemplated with respect to each variation of the invention . various changes may be made to the invention described and equivalents ( whether recited herein or not included for the sake of some brevity ) may be substituted without departing from the true spirit and scope of the invention . in addition , where a range of values is provided , it is understood that every intervening value , between the upper and lower limit of that range and any other stated or intervening value in that stated range , is encompassed within the invention . also , it is contemplated that any optional feature of the inventive variations described may be set forth and claimed independently , or in combination with any one or more of the features described herein . reference to a singular item , includes the possibility that there are plural of the same items present . more specifically , as used herein and in claims associated hereto , the singular forms “ a ,” “ an ,” “ said ,” and “ the ” include plural referents unless the specifically stated otherwise . in other words , use of the articles allow for “ at least one ” of the subject item in the description above as well as claims associated with this disclosure . it is further noted that such claims may be drafted to exclude any optional element . as such , this statement is intended to serve as antecedent basis for use of such exclusive terminology as “ solely ,” “ only ” and the like in connection with the recitation of claim elements , or use of a “ negative ” limitation . without the use of such exclusive terminology , the term “ comprising ” in claims associated with this disclosure shall allow for the inclusion of any additional element — irrespective of whether a given number of elements are enumerated in such claims , or the addition of a feature could be regarded as transforming the nature of an element set forth in such claims . except as specifically defined herein , all technical and scientific terms used herein are to be given as broad a commonly understood meaning as possible while maintaining claim validity . the breadth of the present invention is not to be limited to the examples provided and / or the subject specification , but rather only by the scope of claim language associated with this disclosure .
one embodiment is directed to a method of conducting an injection , comprising : providing an assembly of a syringe plunger movably coupled to a syringe body which may contain fluid for infusion , the syringe body having a distal end that is removably coupled to a luer adaptor , the luer adaptor defining a needle lumen through which a needle may be coupled , the luer adaptor comprising a distal surface configured to be removably coupled to a luer fitting of another device ; deciding upon infusion via needle injection or luer coupling ; and selectably configuring the assembly for needle injection or luer coupling by removing the luer adaptor to further expose the needle for needle injection , or by leaving the luer adaptor in place and coupling it to the luer fitting of the other device .