System and method for multiple site injection
Inventors
Shanley, Conor Edward • Shluzas, Alan E. • Leung, Mina M. • Diaz, Stephen H.
Assignees
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Publication Number
US-12329953-B2
Publication Date
2025-06-17
Expiration Date
Abstract
A system for injecting includes a syringe body having proximal and distal ends, a syringe interior, and a syringe flange at the proximal end thereof. The system also includes an injectable fluid disposed in the syringe interior. The system further includes a finger flange coupled to the syringe flange. Moreover, the system includes a stopper member disposed in the syringe interior. In addition, the system includes a plunger ratchet member coupled to the stopper member. The system also includes a plunger tube disposed coaxially around at least a portion of the plunger ratchet member and operatively coupled thereto.
Core Innovation
The disclosure describes a microliter-range multiple site injection system that enables repeated fixed-dose delivery at multiple patient injection sites while minimizing needle stick risk. It addresses limitations of conventional safety syringes, including issues related to aerosolization or collapse and problems with dose accuracy during repeated use.
The system uses off-the-shelf syringe components configured with a finger-flange, lever, and ratchet mechanism that delivers a predetermined microdose by incremental engagement. Reset between doses is achieved using return springs, and variants include ratchet pawl arrangements and ratchet tube variants that use elastic leaves.
Needle retraction is implemented through manipulation of components within the syringe interior, including retraction into a plunger interior upon transforming an energy-storage member latching member from a latched state to an unlatched state. The disclosure further describes embodiments with anti-retraction or brake mechanisms to limit proximal movement, priming and de-bubbling via a priming screw, and one-way-valve-based fluid control using proximal and distal chambers.
Claims Coverage
The independent claim covers an injection system with four inventive features centered on syringe actuation, plunger structure, needle latching, and internal retraction control.
Finger flange with distally directed thumb-pad actuation
A syringe body having a syringe flange at the proximal end and a finger flange coupled to the syringe flange, with a thumb pad configured to apply a distally directed force to the plunger member and movable relative to the plunger member along a longitudinal axis.
Stopper and plunger member with coaxial plunger tube
A stopper member disposed in the syringe interior and a plunger member coupled to the stopper member, and a plunger tube disposed coaxially around at least a portion of the plunger member and operatively coupled thereto.
Needle hub assembly with selective proximal movement prevention
A needle hub assembly coupled to the syringe body at the distal end, the needle assembly including a needle with a needle proximal end feature, a hub, and a needle latching member configured to selectively prevent the needle from moving proximally relative to the hub.
Energy-storage member latching/unlatching enabling needle retraction
The plunger member comprises a needle retention feature disposed in a plunger interior, an energy-storage member disposed in the plunger interior, and an energy-storage member latching member disposed in the plunger interior, wherein the needle is at least partially retractable into the plunger interior upon manipulation of the plunger tube to transform the energy-storage member latching member from a latched state to an unlatched state.
Across the independent claim, the coverage centers on a syringe system that couples finger-flange and thumb-pad actuation to a stopper/plunger and coaxial plunger tube, while using a needle latching member to control proximal needle movement relative to the hub. The independent claim further ties needle retraction to an internal energy-storage member latching/unlatching transformation triggered by manipulation of the plunger tube.
Stated Advantages
Minimizes needle stick risk during repeated multiple-site procedures.
Enables repeated fixed-dose delivery at multiple patient injection sites.
Improves dose accuracy compared with conventional safety syringes that exhibit dose accuracy problems.
Reduces aerosolization or collapse issues described for conventional safety syringes.
Documented Applications
Multiple site injection using a microliter-range fixed-dose system for repeated delivery at multiple patient injection sites.
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