Hypodermic safety syringe with retracting needle system
First Claim
1. A hypodermic safety syringe with a retracting needle system comprising;
- a transparent cylindrical body element for containing a liquid;
having appurtenances interacting with;
a hollow needle temporarily interconnected with said body element for communicating liquid between said body element and a patient, area or process, said needle having a carriage and a hollow tine, said needle repositionable between an operable extreme wherein said needle projects axially outward from said body element and an inoperable extreme whereby said needle is retracted and contained completely within said body element by interacting with;
a plunger reciprocally received into said body element whereby vacuum and pressurization forces are generated by adjustment of said plunger within said body element wherein liquid is drawn into said body element communicating through said needle by vacuum caused by adjusting said plunger outward from said body element and wherein liquid is expelled from said body element communicating through said needle by pressurization force caused by adjusting said plunger into said body element;
a retraction mechanism whereby a retraction guide is permanently connected to a spring and is locking contact with spherical bearings thus held motionless within a cylindrical cavity within the plunger structure,a safing means associated with said hypodermic safety syringe with retracting needle whereby the needle is automatically retracted into a cavity within said plunger substantially at the end of the injection stroke whereby mating members extending from the retraction guide and needle carriage engage and become captured as an angled surface on the plunger deflects catches restraining the needle and carriage assembly;
spherical bearings within shafts in the plunger align with a radial concave interior surface of the barrel thereby releasing the retraction guide, captured needle and carriage assembly thereby retracting within the cavity in the plunger structure and rendering the syringe safe for handling and transport to disposal.
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Accused Products
Abstract
A hypodermic safety syringe, according to the present invention, includes a barrel having an open end, a cone shaped end and an interior surface. A hollow needle and carriage assembly is temporarily attached and is restrained by four catches extending from the interior tapered surface. A plunger assembly is reciprocally received into the barrel and is in air-tight engagement with the interior surface of the barrel. Thus, an interior chamber is formed in the barrel whereby liquids are retrieved and emitted through the hollow needle. A cavity within the plunger contains a spring and retraction guide assembly with a mating member corresponding to mating members extending from the needle carriage. As the mating members contact and become captured the needle and carriage assembly is released by the approaching plunger assembly as the catches are deflected outward by the angled surface of the plunger. At the end of the injection stroke small spherical bearings, in locking contact with the retraction guide, are caused to move outward and into a radially concave interior surface releasing the retraction guide, captured needle and carriage assembly thereby retracted into the cavity within the plunger structure. Thus rendering the syringe safe for handling and transport to disposal.
107 Citations
9 Claims
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1. A hypodermic safety syringe with a retracting needle system comprising;
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a transparent cylindrical body element for containing a liquid;
having appurtenances interacting with;a hollow needle temporarily interconnected with said body element for communicating liquid between said body element and a patient, area or process, said needle having a carriage and a hollow tine, said needle repositionable between an operable extreme wherein said needle projects axially outward from said body element and an inoperable extreme whereby said needle is retracted and contained completely within said body element by interacting with; a plunger reciprocally received into said body element whereby vacuum and pressurization forces are generated by adjustment of said plunger within said body element wherein liquid is drawn into said body element communicating through said needle by vacuum caused by adjusting said plunger outward from said body element and wherein liquid is expelled from said body element communicating through said needle by pressurization force caused by adjusting said plunger into said body element; a retraction mechanism whereby a retraction guide is permanently connected to a spring and is locking contact with spherical bearings thus held motionless within a cylindrical cavity within the plunger structure, a safing means associated with said hypodermic safety syringe with retracting needle whereby the needle is automatically retracted into a cavity within said plunger substantially at the end of the injection stroke whereby mating members extending from the retraction guide and needle carriage engage and become captured as an angled surface on the plunger deflects catches restraining the needle and carriage assembly;
spherical bearings within shafts in the plunger align with a radial concave interior surface of the barrel thereby releasing the retraction guide, captured needle and carriage assembly thereby retracting within the cavity in the plunger structure and rendering the syringe safe for handling and transport to disposal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification