Fastening element and syringe
Inventors
Assignees
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Publication Number
US-10369297-B2
Publication Date
2019-08-06
Expiration Date
Abstract
A fastening element is proposed for fixing an attachment element on an extension piece of a syringe or a carpule, said extension piece having, on an outer face, at least one projection, wherein the fastening element (1) has an annular main body (3) on which a ring element (13) is articulated such that the ring element engages around the extension piece in a mounted state. The ring element has an annular first wall portion (15), which is articulated on the main body (3) via a first bearing area (19), and has an annular second wall portion (17), which is articulated on the first wall portion (15) via a second bearing area (21), wherein the first and second wall portions (15) and (17) are preferably connected to each other resiliently and enclose between them a free space (23), and wherein the first wall portion (15) is connected resiliently to the main body (3).
Core Innovation
The invention relates to a fastening element for fixing an attachment element on an extension piece of a syringe or a carpule. The extension piece has, on an outer face thereof, at least one projection, and the fastening element comprises an annular main body provided with an internal thread for engagement with an external thread of the attachment element of a needle.
The fastening element further comprises a ring element articulated on an inner face thereof such that the ring element engages around the extension piece in a mounted state. The ring element has an annular first wall portion and an annular second wall portion, with the first wall portion articulated on the main body via a first bearing area and the second wall portion articulated on the first wall portion via a second bearing area, the wall portions enclosing between them a free space.
The first wall portion is connected resiliently to the main body, so that when the fastening element is mounted on the extension piece, the first wall portion is widened and a gap between the inner face and the first wall portion is reduced. As the fastening element is mounted, the ring element is pushed together in a manner of an accordion, enabling the ring element to engage around the projection and increase the retaining forces while resisting accidental axial removal and rotation.
Claims Coverage
The explicitly provided independent claim content identifies one inventive concept with four inventive features. The focus is the articulated, resilient ring element that engages the syringe or carpule extension piece while maintaining a one-piece fastening element structure with an internal thread.
Annular main body with internal thread for needle engagement
An annular main body is provided with an internal thread into which an external thread of the attachment element of a needle can engage.
Articulated ring element engaging around the extension piece
An annular ring element is articulated on an inner face of the main body such that the ring element engages around the extension piece in a mounted state.
First and second wall portions articulated via first and second bearing areas enclosing a free space
The ring element has an annular first wall portion articulated on the main body via a first bearing area and an annular second wall portion articulated on the first wall portion via a second bearing area, wherein the first and second wall portions enclose between them a free space.
Resilient connection of first wall portion producing accordion-like pushing together while mounted
The first wall portion is connected resiliently to the main body, such that when the fastening element is mounted on the extension piece, the first wall portion is widened and a gap between the inner face and the first wall portion is reduced, causing the ring element to be pushed together in a manner of an accordion while the fastening element is mounted.
Across the provided claim content, the core inventive coverage is the one-piece fastening element with an internal thread and an articulated annular ring element whose resilient, accordion-like, two-wall construction enables engagement around the extension piece during mounting.
Stated Advantages
Increases retaining forces.
Resists accidental axial removal.
Resists accidental rotation.
Documented Applications
Fixing an attachment element on an extension piece of a syringe or a carpule, including engagement around an extension piece having projections.
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