a preferred exemplary needle and blood collection tube holder in accordance with the present invention is shown generally at 10 n fig1 , and 5 . as best shown in fig2 the holder 10 includes an inner tube 12 and an outer tube 14 . the tubes can be made from any of the conventional materials utilized for making needle and blood collection tube holders . typically , these materials are plastics , which are strong , lightweight and inert with respect to blood and other liquids . the preferred plastic materials are polypropylene and similar plastics which are conventionally known and used in the art . the inner tube 12 includes a cylindrical exterior surface 16 and an interior cylindrical surface 18 . the interior cylindrical surface 18 defines a blood collection tube receptacle chamber 20 . the inner tube 12 has an open rear end 22 and a restricted forward end 24 . the forward end includes an annulus 26 which is threaded on its interior surface for receiving the threaded collar 28 of the blood collection needle 30 . the blood collection needle 30 includes a forward end 32 which extends outwardly along the longitudinal axis of the inner tube 12 and a rearward end 34 . the blood collection needle is of conventional design with the forward end 32 designed for piercing the patient &# 39 ; s vein and the rearward end 34 being designed for piercing the rubber septum of a standard blood collection vial or tube . the inner tube 12 is designed to be inserted into the outer tube 14 . the outer tube 14 includes an exterior surface 36 and an interior cylindrical surface 38 . the interior cylindrical surface 38 defines a needle protection chamber 40 . the outer tube 14 also includes an open rear end 42 and a restricted forward end 44 . the restricted forward end 44 includes an annulus 46 which has a diaphragm 48 mounted thereto . the diaphragm 48 is best shown in fig6 . the diaphragm 48 is preferably made from a resilient material such as resilient plastic or rubber . the diaphragm 48 includes individual sections or leafs 50 which are sufficiently flexible so that the central orifice 52 can be expanded to receive protective sheaths of different sizes . referring to fig2 a protective sheath 54 is shown inserted within the orifice 52 . the diaphragm leafs 50 provide a means for centering and holding the protective sheath 50 within the annulus 46 . as is conventional , the protective sheath 54 is provided with ridges 55 that are designed to engage mating locations between ridges 57 on needle collar 28 . this engagement allows the blood collection needle to be conveniently screwed into the inner tube annulus 26 prior to blood collection and unscrewed from the annulus after completion of the blood collection procedure . retracted position locking means are included to provide releasable locking of the inner tube 12 to the outer tube 14 when the inner tube is in a retracted position . this locking means includes tabs 56 and 58 and which are located on the exterior surface 16 of the inner tube . the inner tube is provided with adequate resiliency so that tabs 56 and 58 may be compressed sufficiently to allow the inner tube 12 to be inserted into the needle protection chamber . the tabs 56 and 58 are designed to releasably interlock with groove 60 in the outer tube 14 . the expansion of tabs 56 and 58 into groove 60 provides releasable locking of the inner tube 12 at a retracted position wherein needle 32 is completely housed within the needle protection chamber 40 . locking of tabs 56 and 58 within groove 60 can be overcome by pushing or pulling the inner tube 12 with an additional amount of force sufficient to overcome the locking engagement . alternatively , the inner tube 12 can be compressed to remove the tabs 56 and 58 from groove 60 . longitudinal slits 62 are provided at both ends of tabs 56 and 58 to provide easier compression of the tabs for release from groove 60 . the tab and slit arrangement and the method by which tabs are compressed for insertion into the outer tube is best shown in fig3 and 4 . when the inner tube 12 is pushed forward to the extended position as shown in fig5 the compression of tabs 56 and 58 against the interior wall 38 of the outer tube 14 provides sufficient resistance to give a certain amount of releasable locking of tube 12 in the extended position . alternatively , a groove 64 ( shown in phantom in fig2 ) can be provided to increase the amount of force necessary to unlock the inner tube from the extended position as shown in fig5 . operation of the exemplary needle and blood collection tube holder is as follows : the tabs 56 and 58 on inner tube 12 are compressed as shown in fig3 and the inner tube is inserted into the outer tube 14 to the extended position as shown in fig5 . the inner and outer tubes may be stored separately or the entire assembly as shown in fig5 may be stored and / or sold as a single unit . in order to obtain a blood sample , a standard blood collection tube or vial 70 is inserted into the inner tube as shown in fig1 just prior to venipuncture , the needle sheath 54 is removed and venipuncture accomplished . upon venipuncture , the blood collection tube 70 is moved forward so that needle portion 34 punctures the rubber septum 71 to allow transfer of blood into the evacuated blood collection tube . the diameter of the holder can be any size necessary to receive the usual sized blood vacuum containers or collection tubes conventionally used . after one or more samples have been collected , the needle 32 is removed from the vein and simultaneously the inner tube 12 is moved to the retracted position wherein tabs 56 and 58 are seated within groove 60 . at this point , needle 32 is completely housed within needle protection chamber 40 . the needle 32 is then resheathed by inserting the sheath 54 through orifice 52 in the diaphragm 48 . the sheath 54 can be inserted completely through orifice 52 onto the needle 32 . however , it is preferred to only partially insert the sheath 54 and then move the inner tube to the extended position to complete sheathing of needle 32 . at this point , the needle may be removed from the holder and discarded . the holder is then ready to receive the next uncontaminated needle for use in drawing a subsequent blood sample . in carrying out the blood drawing operation , it is desirable that operation of the needle and blood collection tube holder be conducted with one hand . accordingly , the inner tube 12 is provided with an annular ridge 72 and outer tube 14 is provided with an annular ridge 74 . these annular ridges facilitate manual grasping of the tubes during one - hand operation to provide easy manipulation of the inner tube between the extended and retracted positions previously described . having thus described exemplary embodiments of the present invention , it should be noted by those skilled in the art that the within disclosures are exemplary only and that various other alternatives , adaptations , and modifications may be made within the scope of the present invention . accordingly , the present invention is not limited to the specific embodiment as illustrated herein but is only limited by the following claims .
an injury resistant needle and blood collection tube holder which includes an inner tube which telescopes within an outer protective tube . the inner tube is movable between a retracted position wherein the blood collection needle is housed entirely within the outer protective tube and an extended position wherein the needle protrudes for venipuncture . the inner tube is releasably locked in the retracted position to prevent inadvertent disengagement of the protective outer tube . the annular ridges are provided on the tubes to facilitate single - handed operation of the device .