Automatically retracting safety needle assembly
Inventors
Daily, David • Raday, Lior • Lewkonya, Gad • Carmel, Ehoud • LAYBOVITCH, Elyasaf • SARKOROV, Dmitri • Benarous, Nir • Keenan, Guy
Assignees
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Publication Number
US-11850410-B2
Publication Date
2023-12-26
Expiration Date
Abstract
An automatically retracting safety needle assembly configured to receive a syringe. The assembly has distal and proximal ends, and comprises: a housing, with internal housing (IH), and a base wall. A moving sleeve (MOS): at least partially within the IH; having a flange wall; axially movable.A biasing element (BE), within the IH, biasing the MOS proximally.A syringe, receiving a plunger rod; movable axially within the IH, and coupled to the MOS.An activation fork (AF), partially disposed within the IH. AF has a guiding arm coupled with the IH and the MOS; preventing motion of the MOS during non-deployment state.An automatic retraction mechanism, retracting the syringe after injection.Deployment: advance plunger rod and the AF axially (distally), until AF guiding arm allows proximal movement of the MOS, retracting the syringe. Distal advancement of plunger rod is constant without an abrupt increase in resistive force; allowing safe disposal.
Core Innovation
The invention relates to an automatically retracting safety needle assembly configured to receive a syringe. The assembly includes an internal housing with a base wall at the distal end of the internal housing, and a moving sleeve at least partially disposed within the internal housing. The moving sleeve comprises a flange wall and is axially movable, and a biasing element is supported between the base wall and the flange wall to bias the moving sleeve in the proximal direction.
A syringe is disposed in and movable axially within the internal housing, and is coupled to the moving sleeve so that the syringe receives a plunger rod. An activation fork is partially disposed within the internal housing and comprises at least one guiding arm that is coupled with the internal housing and the moving sleeve to prevent proximal motion of the moving sleeve when the assembly is in a non-deployment state.
Deployment for injection is performed by advancing the plunger rod and the activation fork axially in the distal direction with respect to the internal housing until the guiding arm allows proximal movement of the moving sleeve, thereby causing retraction of the syringe after completion of injection. The distal advancement of the plunger rod is substantially constant without an abrupt increase in resistive force to overcome for activating the retraction mechanism, and completion is indicated visually, audibly, or tactilely.
Claims Coverage
The independent claims are directed to an automatically retracting safety needle assembly and a method for retracting a syringe in such an assembly. The core claim set centers on distal deployment that permits proximal moving sleeve movement for automated syringe retraction, with substantially constant distal plunger advancement without an abrupt resistive-force increase to activate retraction. The claims present four inventive features.
Constant-resistance distal deployment enabling automated syringe retraction
The assembly is configured to be deployed for injection by advancing the plunger rod and the activation fork axially in the distal direction with respect to the internal housing, the plunger rod advancing until the at least one guiding arm of the activation fork allows proximal movement of the moving sleeve, thereby causing retraction of the syringe, wherein the distal advancement of the plunger rod is substantially constant without an abrupt increase in resistive force to overcome for activating the retraction mechanism, allowing for safe disposal of the assembly.
Activation fork guiding arms preventing moving sleeve proximal motion in non-deployment
An activation fork, partially disposed within the internal housing, the activation fork comprising at least one guiding arm, the at least one guiding arm being coupled with the internal housing and the moving sleeve so as to prevent proximal motion of the moving sleeve when the assembly is in a non-deployment state.
Internally housed, biasing-element-supported moving sleeve coupled to syringe
A moving sleeve, at least partially disposed within the internal housing, the moving sleeve comprising a flange wall, the moving sleeve being axially movable; and a biasing element, disposed within the internal housing, the biasing element being supported between the base wall and the flange wall, the biasing element being configured to bias the moving sleeve to the proximal direction; the syringe, disposed in and movable axially within the internal housing, and coupled to the moving sleeve.
Advancing plunger rod and activation fork distally until guiding arm allows moving sleeve proximal movement
Advancing the plunger rod and the activation fork axially in the distal direction with respect to the internal housing, the plunger rod advancing until the at least one guiding arm of the activation fork allows proximal movement of the moving sleeve, thereby causing retraction of the syringe, wherein the distal advancement of the plunger rod is substantially constant without an abrupt increase in resistive force to overcome for activating the retraction mechanism.
The independent claim coverage is grounded in a mechanically biased moving sleeve within an internal housing, an activation fork having guiding arms that hold the moving sleeve in a non-deployment state, and a distal plunger and activation fork advance sequence that allows moving sleeve proximal movement for automatic syringe retraction after injection completion, while keeping distal plunger advancement substantially constant without an abrupt resistive-force increase to activate retraction.
Stated Advantages
Safe disposal of the assembly.
Reliable full injection by maintaining distal plunger advancement substantially constant without an abrupt increase in resistive force required to activate retraction.
Prevention of premature termination of injection, as characterized by the constant distal plunger advancement behavior.
Documented Applications
Hypodermic injections using a syringe and needle assembly that automatically retracts the syringe upon completion of injection, with completion indicated visually, audibly, or tactilely.
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