Needleless injection device equipped with an improved percussion device
Inventors
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Assignees
Member
CrossjectCrossject is a specialty pharmaceutical company focused on drug-device combination products for emergency medicine. Leveraging a proprietary needle-free auto-injection platform, the company develops and manufactures fast-acting treatments for life-threatening situations such as epilepsy, adrenal crisis, and anaphylaxis. Crossject conducts advanced regulatory development, clinical validation, and large-scale industrialization to deliver innovative therapies for global markets, with an emphasis on simplicity, reliability, and patient usability.
Crossject is a specialty pharmaceutical company focused on drug-device combination products for emergency medicine. Leveraging a proprietary needle-free auto-injection platform, the company develops and manufactures fast-acting treatments for life-threatening situations such as epilepsy, adrenal crisis, and anaphylaxis. Crossject conducts advanced regulatory development, clinical validation, and large-scale industrialization to deliver innovative therapies for global markets, with an emphasis on simplicity, reliability, and patient usability.
Publication Number
US-10835679-B2
Publication Date
2020-11-17
Expiration Date
Abstract
A needleless injector includes a cap, an injection system, a body, a gas generator, and a percussion device. The body is covered by the cap and is mounted to slide relative to the cap. The percussion device includes a striker that is slidingly mounted along a sliding axis between a rest position and a percussion position and a lock mechanism. The lock mechanism includes a lug and a retention tab. The lug projects from a peripheral face of the striker along an axis that is perpendicular to the sliding axis and has a first support ramp. The retention tab is attached to the cap, and has a second support ramp. The ramps are configured to move the retention tab radially when pushed by the striker from a retaining position to a release position and the retention tab is moved aside to release the striker.
Core Innovation
The invention relates to a needleless injection device having an injection system with at least one plunger, a reservoir containing an active ingredient, and an injection nozzle defining at least one injection channel. A body that is enveloped by a cover is slidably mounted relative to the cover from bottom to top along a sliding axis between a rest position and an injection position. The device further includes a gas generator that comprises a primer.
The percussion device includes a striker and a lock mechanism. The striker is slidably mounted along the sliding axis between a rest position, in which the striker is blocked in translation by the lock mechanism against a prestressed spring, and a percussion position, in which the striker is released by the lock mechanism to strike the primer of the gas generator by the action of the spring. The striker therefore actuates the gas generator primer.
The lock mechanism includes a lug protruding from a peripheral face of the striker along an axis perpendicular to the sliding axis and having a first bearing ramp, together with a retaining tab secured to the cover and having a second bearing ramp arranged opposite to the first bearing ramp. The ramps are configured to interface to drive the retaining tab radially from a retaining position to a release position, such that the retaining tab opposes sliding of the striker in the retaining position and is spaced apart to release the striker in the release position.
Claims Coverage
The document includes one independent claim that defines a needleless injection device with a percussion-driven gas generator primer and a lock mechanism using lug and retaining tab bearing ramps to move from a retaining position to a release position during striker travel and body translation. The independent claim’s inventive features are further narrowed in multiple dependent claims concerning ramp geometry, symmetry, active ingredient selection, and primer ignition interface.
Percussion-driven gas generator primer with striker lock and release
A needleless injection device in which a striker is blocked in translation by a lock mechanism against a prestressed spring in a rest position and is released to strike the primer of a gas generator in a percussion position.
Lug and retaining tab bearing-ramp lock transitioning from retaining to release
A lock mechanism having a lug with a first bearing ramp and a retaining tab secured to the cover with a second bearing ramp arranged opposite to the first bearing ramp, configured to interface to drive the retaining tab radially from a retaining position to a release position, opposing striker sliding in the retaining position and spacing the retaining tab apart to release the striker in the release position.
Obstruction constrained by body position to hold and release the retaining tab
An obstruction secured to the body that constrains the retaining tab in its retaining position when the body is at the rest position and releases the retaining tab in its release position when the body is at the injection position.
Independent claim defines a needleless injection device in which an injection system is actuated by a gas generator primer via a percussion striker that is held by a lock mechanism against a prestressed spring and then released to strike the primer. Claim coverage further relies on a lug and retaining tab with opposing bearing ramps that drive the retaining tab radially from a retaining to a release position, with an obstruction that changes the retaining tab state based on body position.
Stated Advantages
Documented Applications
No documented applications found
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