Safety syringe
AssigneeOwen Mumford Limited
InventorDamian Alexander HOLLAND
Life of this patent
Estimating the term…
Abstract
A safety syringe (100; 700; 1200) comprising: a barrel (104; 704; 1204) having an opening at an end thereof; a syringe plunger (108; 708; 1208) configured to move within the barrel such that an inward stroke of the syringe plunger causes a substance within the barrel to be expelled from the opening; and a sheath (112; 712; 1212) configured to cover at least partially the opening in the barrel after use of the syringe, wherein the sheath is coupled to the syringe plunger and is configured to decouple from the syringe plunger at a point on the inward stroke such that the sheath is moveable independently of the syringe plunger and further movement of the sheath after decoupling at least partially covers the opening in the barrel.
Claims41
A safety syringe comprising:
- a barrel having an opening at an end thereof;
- a syringe plunger configured to move axially within the barrel to cause a substance within the barrel to be expelled from the opening;
- a safety plunger coupled to the syringe plunger such that an inward stroke of the safety plunger causes the syringe plunger to move axially within the barrel;
- and
- a sheath configured to cover at least partially the opening in the barrel after use of the syringe,
- wherein the safety plunger is configured to be coupled to the sheath at a first point on the inward stroke and is configured to decouple from the syringe plunger at a second point on the inward stroke, the second point being substantially the point at which the syringe plunger has reached the end of the barrel, such that the safety plunger is axially moveable independently of the syringe plunger,
- and wherein further axial movement of the safety plunger after the first and second points on the inward stroke causes the sheath at least partially to cover the opening in the barrel,
- the syringe plunger further comprising a lost motion device configured to compress, if needed, to account for manufacturing tolerances and ensure decoupling of the safety plunger from the syringe plunger only after a tip of the syringe plunger has reached the end of the barrel.
A safety syringe apparatus for use with a syringe, the syringe comprising a barrel having an opening at an end thereof and a syringe plunger configured to move axially within the barrel to cause a substance within the barrel to be expelled from the opening, wherein the safety syringe apparatus comprises:
- a safety plunger configured to be coupled to the syringe plunger such that an inward stroke of the safety plunger causes the syringe plunger to move axially within the barrel;
- and
- a sheath configured to cover at least partially the opening in the barrel after use of the syringe,
- wherein the safety plunger is configured to be coupled to the sheath at a first point on the inward stroke and is configured to decouple from the syringe plunger at a second point on the inward stroke, the second point being substantially the point at which the syringe plunger has reached the end of the barrel, such that the safety plunger is axially moveable independently of the syringe plunger,
- and wherein further axial movement of the safety plunger after the first and second points on the inward stroke causes the sheath at least partially to cover the opening in the barrel,
- the syringe plunger further comprising a lost motion device configured to compress, if needed, to account for manufacturing tolerances and ensure decoupling of the safety plunger from the syringe plunger only after a tip of the syringe plunger has reached the end of the barrel.
A kit of parts comprising:
- a safety plunger configured to be coupled to a syringe plunger of a syringe such that an inward stroke of the safety plunger causes the syringe plunger to move axially within the barrel;
- and
- a sheath configured to cover at least partially an opening in a barrel of the syringe after use of the syringe,
- wherein the safety plunger is configured to couple to the sheath at a first point on the inward stroke and is configured to decouple from the syringe plunger at a second point on the inward stroke, the second point being substantially the point at which the syringe plunger has reached the end of the barrel, such that the safety plunger is axially moveable independently of the syringe plunger,
- and wherein further axial movement of the safety plunger after the first and second points on the inward stroke causes the sheath at least partially to cover the opening in the barrel,
- the syringe plunger further comprising a lost motion device configured to compress, if needed, to account for manufacturing tolerances and ensure decoupling of the safety plunger from the syringe plunger only after a tip of the syringe plunger has reached the end of the barrel.
Dependencies are inferred from the claim text.