Insulin syringe with magnified sheath
The insulin syringe with magnified sheath is a syringe with a transparent outer sleeve constructed of a material capable of magnifying printed information. The outer sleeve is slidably attached to the syringe barrel and can lock into a retracted position where it surrounds the syringe barrel and magnifies the dosage indicia thereon while exposing the syringe needle for use or can lock into an extended position where it surrounds the needle to help prevent inadvertent needle sticks.
1. An insulin syringe with magnified sheath, comprising:
a syringe including a needle, a barrel and a plunger with said barrel having dosage indicia thereon; and
a sheath being cylindrical, constructed of a transparent, magnifying material, and dimensioned to surround said barrel of said syringe;
said sheath being slidably coupled with said barrel of said syringe;
said sheath being constructed for axial rotation around said barrel; and
said sheath being constructed for longitudinal movement between a retracted position in which said sheath is disposed over said barrel with said needle exposed for use, and an extended position in which said sheath surrounds said needle thereby preventing inadvertent needle sticks;
wherein, when in its retracted position, said sheath magnifies said dosage indicia on said barrel of said syringe regardless of rotational position of said sheath relative to said barrel.
2. The insulin syringe with magnified sheath according to claim 1 , wherein:
each of said sheath and said barrel has a proximal end and a distal end;
said barrel being threaded around a portion of its outer circumference near each of said distal and said proximal ends; and
said sheath being threaded around a portion of its inner circumference near said proximal end;
wherein, when said sheath is in said retracted position, clockwise axial rotation of said sheath engages threading of said sheath with threading near proximal end of said barrel; and
wherein, when said sheath is in said extended position, counter-clockwise axial rotation of said sheath engages threading of said sheath with threading near distal end of said barrel;
whereby, said sheath is locked in either of said retracted or said extended positions by engaging threading of said sheath with threading of, respectively, either said proximal end or said distal end of said barrel.
3. The insulin syringe with magnified sheath according to claim 1 , wherein:
said sheath is constructed of methyl methacrylate.