US 2026/0263699 A1 · AUTO-DISABLE SYRINGE

Abstract

A fixed-dose auto-disable syringe and locking clip therefor, the syringe having a barrel with an axial fluid chamber length reduced by approximately 20% to 40%, achieved by removing a non-functional proximal barrel portion while preserving the inner diameter, distal geometry, and fill volume. The auto-disable mechanism comprises a stamped stainless steel open-arc locking clip carrying three inwardly directed tabs evenly spaced at approximately 85 degree intervals that engage plunger rod serrations and maintain coaxial alignment of plunger rod with barrel axis, and two outwardly directed tabs that embed in the barrel inner wall to prevent reuse. A circumferential gap of approximately 104 degrees permits lateral placement of clip onto the plunger rod at predetermined dose-setting axial position. A frangible reduced-diameter section in plunger rod fractures at controlled force upon any reuse attempt, rendering the syringe permanently unusable. An alternative embodiment provides an integrally moulded plunger rod and piston.

Claims20

Dependent claims

A fixed-dose auto-disable syringe comprising:

(a) a barrel formed from a transparent polymeric material and having a proximal end, a distal end, a barrel flange at the proximal end, an inner wall defining a fluid chamber, and a needle hub at the distal end;
(b) a plunger rod received within the barrel for axial movement therein, the plunger rod having a plunger rod flange at its proximal end and a piston at its distal end, the piston forming a fluid-tight sliding seal with the inner wall of the barrel, the plunger rod having a plurality of serrations on its outer surface;
and
(c) an auto-disable mechanism configured to passively and automatically prevent reuse of the syringe upon delivery of a nominal dose volume, without any additional action by the user;
wherein the barrel has a reduced axial fluid chamber length, said reduction being achieved only by removal of a proximal barrel portion that does not contribute to the fluid chamber volume or to the plunger stroke length required for activation of the auto-disable mechanism, and wherein the inner diameter of the barrel, the distal barrel geometry, and the needle tip interface of the barrel are unchanged.

2 more elements

Dependencies are inferred from the claim text.

Auto-disable syringe

Life of this patent

Auto-disable syringe

Life of this patent

Abstract

Claims20