Injection device with extraction mechanism and associated process
Inventors
Walter, Thomas • CARPENTIER, Léa
Assignees
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Publication Number
US-12377225-B2
Publication Date
2025-08-05
Expiration Date
Abstract
Disclosed is an injection device including: —a needle support; —an injection needle integral with the needle support and having a free end arranged away from the needle support; and —a needle extraction mechanism including a base connected to the needle support and a plunger movable relative to the base between a needle use position and a needle extraction position. The base is movable relative to the needle support between an inactive position of the extraction mechanism and an active position of the extraction mechanism. The plunger includes an outer member and an inner member, movable relative to the outer member, from a retracted plunger configuration to a deployed plunger configuration wherein the plunger length is greater than in the retracted configuration.
Core Innovation
The injection device includes a needle support and an injection needle integral with the needle support, where the injection needle has a free end arranged away from the needle support. The device further includes an injection needle extractor comprising a base connected to the needle support and a plunger movable relative to the base between a needle use position and a needle extraction position. The base is movable relative to the needle support between an extractor inactive position and an extractor active position.
The plunger comprises an outer member and an inner member movable relative to the outer member from a plunger retracted configuration to a plunger deployed configuration. The length of the plunger in the deployed configuration is greater than the length of the plunger in the retracted configuration. A temporary base immobilization assembly using slots in the outer and/or inner members and an engaged bar prevents base activation during the retracted state.
The base immobilization assembly is deactivated upon deployment so that the extractor base can move from the inactive position to the active position. The inner and outer members are retained relative to each other by a flexible snap-in interlocking mechanism with an asymmetrical tooth and/or tab geometry and defined front and rear housings, and a ramp defining the housings is described as part of the interlocking mechanism. The flexible interlocking mechanism locks the inner member in the deployed configuration and temporarily retains the inner member in the retracted configuration.
Claims Coverage
The independent claim is clm-00001. The inventive features include two main features: an integrated needle support/needle extractor architecture with a base movable between inactive and active positions, and a plunger with outer and inner members that deploys such that the deployed plunger length is greater than the retracted plunger length.
Integrated needle support with extractor base and movable plunger
An injection device comprising a needle support; an injection needle integral with the needle support and having a free end arranged away from the needle support; and an injection needle extractor comprising a base connected to the needle support and a plunger movable relative to the base between a needle use position and a needle extraction position, the base being movable relative to the needle support between an extractor inactive position and an extractor active position.
Deployed plunger configuration longer than retracted configuration
The plunger comprises an outer member and an inner member movable relative to the outer member from a plunger retracted configuration to a plunger deployed configuration, wherein a length of the plunger in the plunger deployed configuration is greater than a length of the plunger in the plunger retracted configuration.
Flexible interlocking locking of inner and outer members in deployed configuration
The plunger includes a flexible interlocking mechanism that locks an inner member relative to an outer member when the plunger is deployed.
Snap-in tab tooth engages housing for the flexible interlocking mechanism
The flexible interlocking mechanism comprises snap-in tabs and housings such that the snap-in tab’s tooth engages the housing when the plunger is in the deployed configuration.
Base immobilizer with first and second slots and engaged bar dimensional relationship
A base immobilizer includes first and second slots oriented toward a needle support, where the second slot is wider than the first and a bar engages both slots with a length greater than the width of the first slot but less than the width of the second slot.
Preparation method sequencing for needle removal using plunger deployment then base activation
A method for preparing to remove a needle previously inserted into a patient’s body by providing a device according to claim 1, moving an inner member relative to an outer member to deploy a plunger and increase its length, and then moving the base from an inactive position to an active position before removal.
Across the independent claim and the identified dependent refinements in the provided material, the coverage centers on an extractor in which a base transitions between inactive and active positions tied to a plunger that deploys to a configuration longer than its retracted state, with flexible snap-in interlocking locking and retention of inner and outer members and a base immobilizer described using slot and bar geometry; a related method sequences plunger deployment before base activation for needle removal preparation.
Stated Advantages
Reduced device footprint.
Improved patient comfort.
Reduced handling error.
Reduced pricking risk.
Documented Applications
A needle-removal preparation context for an injection device in which the needle is removed using an injection needle extractor having an inactive/active base and a plunger deployed configuration.
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