Retractable needle system

A hypodermic syringe system comprising a captured needle a spring loaded needle means for holding and ejecting soul captured needle, barrel means for holding injectable fluid therein and connectable to said spring loaded needle means on one end, and a plunger means having a hollow portion, said plunger means positionable within and movable through said barrel means, said plunger means having a breakable end adjacent said hollow portion which breaks free from one end of said plunger means and allows said captured needle to be ejected into said hollow portion of said plunger means within said barrel means, wherein said spring loaded needle means has a housing with resilient fingers on one end, which can be spread radially outward by said one end of said plunger means in contact therewith to release said captured needle from said housing, wherein said breakable end of said plunger means breaks allowing said captured needle to be propelled out of said housing and into said hollow portion of said plunger means and be retained therein, wherein said breakable end of said plunger means includes tapered shoulders which engage oppositely and complementing shoulders of said resilient fingers, allowing forward movement of said plunger means to spread said resilient fingers radially outward, said syringe system further comprising an extending tab and a receiving slot associated between an exterior of said plunger means and the interior of said barrel means, said extending tab and said receiving slot oriented to lock together when said tab and said slot are brought into alignment with each other within said barrel means, thereby locking said plunger means within said barrel means.

A retractable needle system comprising:

• (a) an injection needle having a shaft with an axial passageway therethrough, said shaft having a sharp end and a holder defining a lip on another end,
• (b) a spring housing having an exterior surface, resilient legs spreadable radially outward on a first end, said spring housing having exteriorly located attachment tabs extending radially outward, an opening on a second end of said spring housing to receive said shaft of said injection needle in sealing engagement while retaining said holder, said resilient legs having radially inwardly positioned hooks sized to engage and hold said lip of said holder of said injection needle when said shaft of said injection needle is forwardly positioned within said spring housing, said hooks having inwardly tapered shoulders,
• (c) a coiled spring means positioned axially within said spring housing between said holder and said second end of said spring housing, said spring means exerting a repulsive force between said holder of said injection needle and said second end of said spring housing less than the retaining force exerted by said hooks of said resilient legs, thereby retaining said injection needle within said spring housing against said repulsive force of said spring means,
• (d) barrel means for engaging and holding said spring housing, said barrel means including slots and a groove sized and positioned within an interior of said barrel means to receive said extending tabs of said spring housing in locking engagement, said interior of said barrel means shaped sufficient to engage said spring housing and allow said resilient legs to flex radially outward;
• and
• (e) a plunger sized to be received concentrically within said barrel means, said plunger having a hollow axially located chamber therein, and having a dissociable end and outwardly tapered shoulders adjacent to said dissociable end, wherein said dissociable end dissociates from said plunger and is ejected into said chamber when said outward tapered shoulders forcibly engage said inwardly tapered shoulders of said hooks of said resilient legs, spreading said resilient legs outwardly and disengaging said hooks from said lip of said injection needle, thereby allowing said dissociable end to dissociate under a predetermined normal force between said holder of said injection needle and said dissociable end, and allowing said coiled spring means to eject said injection needle from said spring housing into said chamber within said plunger.

A retractable needle system comprising:

• (a) a barrel having an attachment end,
• (b) a plunger including an interior cavity and a dissociable end adjacent thereto said plunger sized to be received within and slide through said barrel,
• (c) a hollow needle;
• and
• (d) a spring holding means including a spring, said spring holding means associated with and held by said attachment end of said barrel, for holding said needle and selectively retracting said needle into said interior cavity of said plunger when said plunger abuts against said spring holding means and moves beyond a portion of said barrel, causing dissociation of said dissociable end, and allowing said dissociable end of said plunger to separate, and wherein said spring holding means can easily be attached to said attachment end of said barrel and lockable thereto.

A syringe or sampling system comprising:

• (a) a barrel having an attachment end;
• (b) a plunger including an interior cavity and a dissociable end adjacent thereto, said plunger sized to be received within and slide through said barrel, and having a slideable piston retained on an interior end, slideable along a predetermined length,
• (c) a hollow needle;
• and
• (d) a spring holding means including a spring, said spring holding means associable with and holdable by said attachment end of said barrel, for holding said needle and selectively retracting said needle into said interior cavity of said plunger when said plunger abuts against said spring holding means and moves beyond a portion of said barrel, causing dissociation of said dissociable end, and allowing said dissociable end of said plunger to separate, while said slideable piston rearwardly slides from a first forward position to a second rearward position, and wherein said spring holding means attachable to said barrel means.

A retractable needle system comprising:

• (a) a barrel having a partially open end and a fully opened end,
• (b) a plunger, having a hollow portion and a converging taper with a resiliently slideable piston on one end, slideably received within said barrel
• (c) a plunger dissociable end adjacent the converging taper end of said plunger,
• (d) a needle positioned within the partially opened end of the barrel, said needle having an axial passageway therethrough, a sharp end and a holder end, and
• (e) spring holding means associable with and positionable on said syringe barrel, and having a coiled spring surrounding said needle for exerting and expansive force between the holder end and the holding means, wherein the spring holding means selectively holds the holder end and the spring therebetween and further having extended resilient fingers with interior and inferiorly positioned hooks engageable with said holder end in an assembled condition, the retractable needle system safely retracting said injection needle by urging the plunger completely into the barrel toward the partially open end until the plunger dissociable end forcibly dissociates and spreads the resilient fingers of the spring holding means radially outward releasing the holder end against the expansive force of said coiled spring separating the plunger dissociable end and permitting the plunger dissociable end, the spring, the needle and its holder end to extend into the hollow portion of the plunger retracting and retaining the injection needle therewithin.

A blood extraction or injection system comprising:

• (a) a barrel having a partially open end and a fully opened end,
• (b) a plunger having a hollow portion slideably received within said barrel having a converging taper with a resilient piston on one end and a axial flange on the other,
• (c) a stopper fixably disposed within said hollow portion at the flange end forming a seal,
• (d) a plunger dissociable end adjacent the converging taper end of said plunger,
• (e) an injection needle positioned into the partially open end of the barrel, said needle having an axial passageway therethrough, a sharp end and a holder end having a lip, and
• (f) spring holding means associated with and positionable on said barrel, and having a coiled spring surrounding said needle for exerting an expansive force between the holder end and the spring holding means, wherein the spring holding means selectively holds the holder end and the spring therebetween and further having extended resilient fingers with interior and inferiorly positioned hooks engageable with said lip to retain the lip on the holder end in an assembled condition, the system safely retracting said injection needle by urging the plunger completely into the barrel toward the partially open end until the plunger's dissociable end forcibly dissociates and spreads the resilient fingers of the spring holding means radially outward releasing the lip of the holder end against the expansive force of said coiled spring and permitting the dissociable end, the spring along with the needle and holder end to extend into the hollow portion of the plunger retracting and retaining the injection needle therewithin.

A retractable needle system for taking body fluid samples comprising:

• (a) a barrel having a partially open end and a fully opened end,
• (b) a plunger having a hollow portion slideably received within said barrel having a converging taper with a resilient piston on one end and a hollow linking needle fixably attached on the other end,
• (c) an injection needle positioned onto the partially open end of the barrel, said needle having an axial passageway therethrough, a sharp end and a holder end having a lip,
• (d) a sampling fluid vacuum container having a resilient perforatable seal on one end, slideably disposed within said barrel and impinged upon said linking needle such that communication is made between the container and the injection needle through the plunger allowing body fluid to be drawn into the container by vacuum for fluid sampling, and
• (e) a spring holding means associated with and positionable on said barrel, said spring holding means having a coiled spring surrounding said needle for exerting an expansive force between the lip of the holder end and the spring holding means wherein the spring holding means selectively holds the holder end against the spring while allowing the injection needle to extend through the spring holding means in an assembled condition, and further having extended resilient fingers with interior and inferiorly positioned hooks engageable with said lip to retain the holder end and the needle in an assembled condition, the system safely retracting said injection needle after a sample of body fluid has been drawn into the vacuum container by urging the container further into the barrel toward the partially open end with the plunger converging tapered end forcibly spreading the resilient fingers of the spring holding means radially outward releasing the lip against the expansive force of said coiled spring permitting the spring to extend into the hollow portion of the plunger retracting the injection needle therewithin.