Linear insertion device with rotational drive
Inventors
Coker, Justin • DeStefano, Mark A. • Hsu, Kenneth C. • STANSBERRY, Amber • Strasma, Paul • Gillett, David • Estes, Mark • Karunaratne, Amrith
Assignees
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Publication Number
US-12357751-B2
Publication Date
2025-07-15
Expiration Date
Abstract
A system for delivering fluid to a user transcutaneously includes a torsion spring, a drive wheel, a linear slide having a stylet attached thereto, and a cannula. The torsion spring, when actuated, is configured to rotate the drive wheel to cause the linear slide to move axially to drive the stylet and cannula into a user-s skin.
Core Innovation
The invention provides a system for delivering fluid to a user transcutaneously. The system includes a drive wheel and a torsion spring disposed within the drive wheel. When actuated, the energized torsion spring delivers a spring force to rotate the drive wheel, and the rotation causes a linear slide engaged with the drive wheel to move axially to drive a stylet and cannula into a user's skin.
The system includes an infusion set base configured to removably couple to an inserter housing and to attach to a user's skin. As the cannula is driven into the user's skin, the infusion set base engages with the cannula to hold the cannula in the user's skin as the stylet is retracted. The system further includes an automatic release mechanism configured to automatically decouple the inserter housing from the infusion set base following insertion of the cannula.
The disclosure further specifies mechanical delivery geometry and cannula sealing features. The drive mechanism can include a pin and an elongate slot arranged to transfer rotational movement of the drive wheel to axial movement of the linear slide, and an angled internal housing surface enabling angled delivery. The cannula includes a septum configured to allow passage of a stylet and to self-seal as the stylet is removed, and an infusion set base includes a central port through which an elongate flexible member extends while locking the cannula barrel thereto.
Claims Coverage
The partial content contains three independent claims (clm-00001, clm-00013, clm-00015). Across these independent claims, there are inventive features centered on a torsion-spring-powered rotational-to-axial drive for transcutaneous stylet/cannula insertion, coupling, retention, and automatic decoupling via an infusion set base and release mechanism, and cannula septum self-sealing with an infusion set base that locks a barrel via a central port.
Energized torsion spring driving a drive wheel and axial linear slide insertion
The torsion spring is energized such that, when actuated, the torsion spring delivers a spring force on the drive wheel to rotate the drive wheel, and rotation of the drive wheel causes the linear slide engaged with the drive wheel to move axially to drive the stylet and cannula into a user's skin.
Infusion set base retention and automatic release after insertion
The infusion set base is configured to engage with the cannula as the cannula is driven into the user's skin so as to hold the cannula in the user's skin as the stylet is retracted, and the system includes an automatic release mechanism configured to automatically decouple the inserter housing from the infusion set base following insertion of the cannula.
Pin and elongate slot framework for rotational-to-axial transfer
The drive wheel comprises a pin and the linear slide comprises a framework having an elongate slot therein, the elongate slot configured to be positioned around the pin to transfer rotational movement of the drive wheel to axial movement of the linear slide.
Self-sealing septum with passage of a stylet
A cannula comprising a barrel and an elongate flexible member, wherein the barrel further includes a septum therein, the septum configured to allow passage of a stylet through the cannula and to self-seal as the stylet is removed from the cannula.
Infusion set base central port and barrel locking
An infusion set base comprising a central port through which the elongate flexible member is configured to extend, the infusion set base configured to lock the barrel thereto.
Overall, the independent claims cover a transcutaneous fluid-delivery system using an energized torsion spring to rotate a drive wheel that moves a linear slide axially to drive a stylet and cannula, with an infusion set base that holds the cannula and an automatic release mechanism decoupling an inserter housing after insertion. The mechanical drive can use a pin and elongate slot to transfer rotational movement to axial movement, and the cannula includes a septum that self-seals when the stylet is removed, while the infusion set base uses a central port to extend an elongate flexible member and lock the cannula barrel.
Stated Advantages
Documented Applications
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