referring initially to fig1 , a safety catheter in accordance with the present invention is shown and is generally designated 10 . more specifically , the safety catheter 10 is shown to include a handle 12 having a textured surface , and a shield ( cap ) 14 . in fig1 the shield 14 is shown engaged with the handle 12 . with this engagement , ribs ( not shown ) that are located inside the shield 14 help stabilize components of the safety catheter 10 prior to its use . for an operational use of the safety catheter 10 , however , the shield 14 is removed from the handle 12 . in fig2 , a luer assembly 16 , which is an essential component of the safety catheter 10 , is shown positioned to establish fluid communication with the vasculature of a patient 18 . as intended for the present invention , the luer assembly 16 is used to establish a single fluid - access site for repetitively or sequentially infusing fluid medicaments into the vasculature of a patient 18 from a fluid source ( not shown ). the exploded view of the safety catheter 10 that is shown in fig3 illustrates the various component parts that are required for construction and assembly of the catheter 10 . as shown , in addition to the shield 14 , the safety catheter 10 includes a hollow body portion 20 , a cannula 22 , an eyelet 24 , and a one - way valve 26 . in combination , these particular parts establish the luer assembly 16 . further , it will also be seen that the body portion 20 has guides 28 which are formed in the hollow of the body portion 20 . in order to assemble the luer assembly , fig3 and 4 show that the proximal end 30 of the cannula 22 is bonded to the eyelet 24 . the eyelet 24 is then fitted into the hollow body portion 20 so that the cannula 22 extends from the distal end 32 of the body portion 20 , with its distal end 34 exposed . also , as shown in fig4 , the luer assembly 16 includes a one - way valve 26 that is positioned at a location inside the hollow body portion 20 , proximal to the eyelet 24 . for the purposes of the present invention , the cannula 22 is preferably made of a flexible , bio - compatible elastomeric material . returning briefly to fig3 it will be seen that the safety catheter 10 also includes a stylet 36 and a shuttle body 38 . further , in fig5 it will be seen that a filter plug 40 is positioned inside the shuttle body 38 . it will also be seen in fig5 that the distal tip 42 of the stylet 36 is beveled to present a sharp end for penetrating tissue of the patient 18 . and , the proximal end 44 of the stylet 36 is bonded to the distal end 46 of the shuttle body 38 . fig5 also shows that the distal end 46 of the shuttle body 38 is formed with diametrically opposed flats 48 a and 48 b . together , and as shown in fig5 , the stylet 36 and the shuttle body 38 , in combination with the filter plug 40 , establish a shuttle assembly 50 . for the present invention , the shuttle body 38 of the shuttle assembly 50 is preferably made of a clear plastic material . with reference to fig3 it is to be appreciated that the handle 12 of safety catheter 10 includes a handle body 52 and a body top 54 . structurally , the proximal end 56 of the body top 54 is bonded to the distal end 58 of the handle body 52 . further , as best seen in fig6 , the handle body 52 is formed with an internal chamber 60 . also , the body top 54 is formed with a window 62 that is located between the proximal end 56 and the distal end 64 of the body top 54 . importantly , the body top 54 is formed with a pair of resilient fingers 66 a and 66 b that extend in a distal direction from the distal end 64 of the body top 54 . each of the resilient fingers 66 a and 66 b is formed with a respective nib 68 a and 68 b . additionally , a registration flat is formed at the distal end 64 to prevent rotation of the handle 12 when it is engaged with the shield ( cap ) 14 . preferably , the body top 54 is made of a clear plastic material . fig3 also shows that the safety catheter 10 includes a spring 70 . more specifically , when the safety catheter 10 is assembled , the spring 70 is positioned between a lip 72 that is formed on the shuttle body 38 ( see fig5 ) and an abutment 74 that is formed inside the body top 54 ( see fig6 ). as intended for the present invention , the spring 70 is used to selectively provide a motive force that will change the configuration of the safety catheter 10 during its operation . in the operation of the safety catheter 10 of the present invention , it is necessary that the shuttle assembly 50 be moved from a first location on the handle 12 , to a second location inside the chamber 60 of the handle 12 . more specifically , with the shuttle assembly 50 in its first location on the handle 12 , the safety catheter 10 can be used to establish fluid access for the luer assembly 16 into the vasculature of the patient 18 . to maintain this fluid access site , the luer assembly 16 needs to be effectively separated from the rest of the safety catheter 10 . this is done by moving the shuttle assembly 50 to its second location inside the handle 12 . further , with the shuttle assembly 50 in its second location , the sharp distal tip 42 of the stylet 36 is effectively concealed inside the chamber 60 of the handle 12 to prevent inadvertent or accidental “ sticks ” by the stylet 36 . referring now to fig7 , when the shuttle assembly 50 is in its first location , the luer assembly 16 , the shuttle assembly 50 and the handle 12 all interact with each other . in more detail , with the engagement of the shuttle assembly 50 to the luer assembly 16 , the stylet 36 of the shuttle assembly 50 extends through the lumen in the cannula 22 of the luer assembly 16 . this stiffens the cannula 22 . at the same time , the guides 28 in the hollow body portion 20 of the luer assembly 16 register the stylet 36 of the shuttle assembly 50 with the luer assembly 14 . also , as the hollow body portion 20 of the luer assembly 16 is positioned over the resilient fingers 66 a and 66 b of the body top 54 , the respective nibs 68 a and 68 b are aligned with flats 48 a and 48 b of the shuttle body 38 by the guides 28 of the luer assembly 16 . this interaction between the luer assembly 16 and the handle 12 effectively holds the shuttle assembly 50 in its first location on the handle 12 . a view of the safety catheter 10 when the shuttle assembly 50 is in its first location on the handle 12 is shown in fig8 . there it will be seen that the stiffened cannula 22 ( i . e . as it is stiffened by the stylet 36 ) extends distally from the handle 12 for insertion of the cannula 22 into the vasculature of a patient 18 ( see fig2 ). it should also be noted that , as shown in fig7 , while the shuttle assembly 50 is in its first location , the spring 70 is compressed between the lip 72 on the shuttle body 38 and the abutment 74 on body top 54 . to confirm the safety catheter 10 has been properly positioned ( i . e . the luer assembly 16 is in fluid communication with the vasculature of the patient 18 ), a blood “ flash ” can be observed through the window 62 . the filter plug 40 then confines the blood that enters into the shuttle assembly 50 with this “ flash ”, and prevents blood born pathogens from leaking out of the safety catheter 10 . at this point , the luer assembly 16 can be disengaged from the handle 12 . to do this , the hollow body portion 20 of the luer assembly 16 is lifted and removed from the resilient fingers 66 a and 66 b of the shuttle body 38 . in turn , this causes the resilient fingers 66 a and 66 b of the handle 12 to be lifted from the flats 48 a and 48 b . this action disengages the body top 54 of the handle 12 from the shuttle assembly 50 . at this point , the compressed spring 70 is no longer constrained . thus , an expansion of the spring 70 then moves the shuttle assembly 50 through the internal chamber 60 to its second location on the handle 12 ( see fig9 ). importantly , as a consequence of the above - described functionality , the luer assembly 16 remains in place in fluid communication with the vasculature of the patient 18 ( see fig2 ). further , as best appreciated with reference to fig9 , the distal tip 42 of stylet 36 can be observed through the window 62 when the shuttle assembly 50 has been properly concealed within the chamber 60 of the handle 12 . while the particular safety catheter as herein shown and disclosed in detail is fully capable of obtaining the objects and providing the advantages herein before stated , it is to be understood that it is merely illustrative of the presently preferred embodiments of the invention and that no limitations are intended to the details of construction or design herein shown other than as described in the appended claims .
a device and method for positioning a catheter to establish a fluid access site into the vasculature of a patient includes a luer assembly that incorporates the catheter . also included is a shuttle assembly that has a stylet for stiffening the catheter . in combination , the stiffened catheter and the shuttle assembly are held on a handle by the interaction of the luer assembly with the handle . once the stiffened catheter is inserted into the vasculature , the luer assembly is separated from the handle and from the stylet , and is left in place . with this separation , the shuttle assembly is also released to be repositioned and concealed within the handle .