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Publication Number
US-12318598-B2
Publication Date
2025-06-03
Expiration Date
Abstract
A safety syringe for medical use having an injection molded plastic body with a tubular barrel, a transverse finger flange surrounding the barrel and two upwardly projecting wings with substantially flat, outwardly facing surfaces disposed forwardly of the finger flange, a plunger assembly slidably engaging an inside wall of the barrel, a needle with a tip projecting forwardly from the barrel, and a needle safety shield slidably engaging the body between the wings, wherein the transverse finger flange has a window that allows core pin insertion through the window during injection molding of the body, the plunger assembly has a proximal end cap that is integral with the plunger handle and abuts a rearwardly facing surface of the transverse finger flange, and the needle safety shield has a distal end with a cylindrical needle guard that is forwardly movable following use of the syringe to guard the needle tip.
Core Innovation
A safety syringe for medical use is provided with an injection-molded plastic body. The body includes a tubular barrel, a cylindrical nose projecting forwardly from the barrel, a needle holder projecting forwardly from the cylindrical nose, and a finger flange projecting transversely from the barrel, with two substantially parallel, spaced-apart wings extending forwardly from the finger flange and a window formed between the wings.
The syringe includes a needle coupled to and projecting forwardly from the needle holder, and a plunger assembly with a plunger handle having an elastomeric plunger seal insertable into the barrel through a rearwardly facing opening in a cylindrical collar to slidably engage an inside wall of the barrel. The proximal end of the plunger handle has a thumb cap with a forwardly projecting cylindrical collar that slides forwardly over the cylindrical collar of the body and abuts against a rearwardly facing surface of the finger flange when fully advanced.
A needle safety shield is disposed to initiate forward sliding movement relative to the body and selectively reposition a cylindrical needle guard to guard the needle tip after use. The needle safety shield includes an activation handle disposed between and slidably engaging the wings and an upwardly facing touch surface that facilitates manual pressure to initiate forward sliding movement, with guide rails and stop features preventing retraction once repositioned.
Claims Coverage
The document contains two independent claims. Both independent claims cover a safety syringe architecture combining an injection-molded plastic body, a plunger assembly with an elastomeric plunger seal, and a needle safety shield that moves between a first pre-use/during-use position and a second post-use position, with wing-based guiding via a window and inwardly projecting guide rails.
Injection-molded plastic body with finger flange window between spaced wings
An injection-molded plastic body comprising a tubular barrel, a cylindrical nose projecting forwardly, a needle holder projecting forwardly, a finger flange projecting transversely, a cylindrical collar projecting rearwardly from the finger flange, and two substantially parallel, spaced-apart wings extending forwardly from the finger flange and projecting tangentially from the barrel, wherein the finger flange comprises a window formed between the two substantially parallel, spaced-apart wings.
Plunger assembly with elastomeric plunger seal insertable through collar opening
A plunger assembly comprising a plunger handle having a distal end with an elastomeric plunger seal insertable into the barrel through a rearwardly facing opening in the cylindrical collar to slidably engage an inside wall of the barrel, and a proximal end having a thumb cap with a forwardly projecting cylindrical collar that slides forwardly over the cylindrical collar and abuts against a rearwardly facing surface of the finger flange when fully advanced.
Needle safety shield with manual pressure activation to reposition needle guard
A needle safety shield comprising an activation handle disposed between and slidably engaging the wings and an upwardly facing touch surface that facilitates manual pressure by a user to initiate forward sliding movement of the needle safety shield relative to the body to selectively reposition a cylindrical needle guard from a first position surrounding the cylindrical nose during use to a second position guarding the needle tip following use.
Wing guide rails slidably engaging channels on activation handle
A needle safety shield comprising an activation handle having channels disposed on opposing sides, a needle guard disposed at a forward end of the activation handle, and an outwardly facing touch surface at a rear end of the activation handle, wherein the channels slidably engage the inwardly projecting, longitudinally extending guide rails of the wings during movement of the needle safety shield between a first position where the needle guard surrounds the cylindrical nose and a second position where the needle guard circumferentially surrounds the needle to protect a user from inadvertent contact with the needle tip.
Across both independent claims, the core claim coverage is directed to a safety syringe having an injection-molded plastic body with a finger flange window between spaced wings, a plunger assembly with an elastomeric plunger seal and thumb-cap geometry, and a needle safety shield that is manually activated and guided by wing-based structures to move a needle guard from a first surrounding position to a second protective position after use, including guide-rail/channel engagement and stop behavior to maintain the second position.
Stated Advantages
Protects a user from inadvertent contact with the needle tip after use.
Enables selectively repositioning a cylindrical needle guard from a first position surrounding the cylindrical nose during use to a second position guarding the needle tip following use.
Provides a sliding needle safety shield guided by channels that engage inwardly projecting, longitudinally extending guide rails of the wings during movement between first and second positions.
Documented Applications
Medical use safety syringe.
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