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Publication Number
US-10076356-B2
Publication Date
2018-09-18
Expiration Date
Abstract
A subcutaneous access device has a skin attachment plate coated with an adhesive layer. The skin attachment plate is moveably linked by a retraction mechanism to a needle support with fixedly positioned needles. In the ready-to-use position the skin attachment plate is spaced away from the needle support and covers the fixedly positioned needles. Subcutaneous insertion of the needles is effected by attachment of the skin attachment plate with the adhesive layer to the skin and releasing the retraction mechanism, thus triggering the pulling of the attached skin with high velocity against the tip of the needles.
Core Innovation
The invention relates to a device for subcutaneous access adapted to insert a needle into an individual's skin by effecting a relative movement between a surface of the skin and the needle. The device comprises a device body including a needle support, with the needle fixedly held by the needle support, and a skin attachment plate with an adhesive surface adapted for attachment to the skin, placed between the device body and the skin.
The device body and the skin attachment plate are movable relative to one another by linear guideways, where one end of the linear guideways is fixedly connected to the skin attachment plate and the other end is movably connected to the device body. The linear guideways include inner tubes connected to the skin attachment plate that are telescopically slidable in outer tubes connected to the device body, and retraction mechanisms are arranged between the skin attachment plate and the movable end of the linear guideways.
In a ready-to-use position, with the skin attachment plate spaced from the device body, the spring-type mechanisms are held pre-stressed by a withholding mechanism and actuated by a release element to shoot into a relaxed state. After release, the device body with the fixedly held needle and the skin attachment plate move towards one another so that the needle is inserted into the skin.
The described concept addresses limitations of prior patch/shot insertion approaches by using forced skin pulling based on the relative movement between the skin attachment plate and the device body, rather than relying on skin elasticity. It further discusses improved safety and penetration, independent insertion depth and angle, insertion of multiple non-central needles, including angled insertion such as 45°, and reduced dependence on flexible connections by employing telescopic linear guideways and spring-type retraction mechanisms.
Claims Coverage
The provided content identifies one explicit independent claim and related inventive features. The main inventive features are centered on telescoping linear guideways, spring-type retraction mechanisms held pre-stressed by a withholding mechanism, and a release element that drives relative motion between an adhesive skin attachment plate and a needle-fixed device body.
Fixed needle in a needle support within a device body
The device comprises a device body including a needle support, and the needle is fixedly held by the needle support in the device body.
Adhesive skin attachment plate between device body and skin
The device includes a skin attachment plate with an adhesive surface adapted for attachment to the skin, the skin attachment plate being placed between the device body and the skin.
Movable relative movement by linear guideways
The device body and the skin attachment plate are movable relative to one another by linear guideways, with one end of the linear guideways fixedly connected to the skin attachment plate and another end movably connected to the device body.
Telescopically slidable inner tubes in outer tubes
The linear guideways include inner tubes connected to the skin attachment plate, the inner tubes being telescopically slidable in outer tubes connected to the device body.
Spring-type retraction mechanisms with withholding and release
In a ready-to-use position, the spring-type mechanisms are held pre-stressed by a withholding mechanism and, actuated by a release element, shoot into a relaxed state so that the device body with the fixedly held needle and the skin attachment plate move towards one another.
Coverage centers on a subcutaneous access device that inserts a fixed needle using telescoping inner/outer linear guideways and spring-type retraction mechanisms held pre-stressed by a withholding mechanism and actuated by a release element to move an adhesive skin attachment plate and a needle-fixed device body towards one another.
Stated Advantages
Improved safety and penetration compared to prior patch/shot insertion approaches by using forced skin pulling rather than relying on skin elasticity.
Ability to insert multiple non-central needles.
Independent insertion depth and angle.
Ability to perform angled insertion, including 45° insertion.
Reduced dependence on flexible connections.
Avoidance of failed piercing or unreliable insertion depth.
Documented Applications
Subcutaneous access for inserting a needle into an individual's skin to enable delivery or measurement configurations described in the document, including injection fluid delivery via sequentially actuated needles connected to a pump.
Subcutaneous analyte determining systems, including microdialysis/probe setups with a guide needle and analyte determining system with periodic calibration.
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