Needle hub and IV catheter system comprising such needle hub
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Publication Number
US-11406794-B2
Publication Date
2022-08-09
Expiration Date
Abstract
An intravenous (IV) catheter system may include a catheter hub, a needle hub and a needle shield. The needle hub may include a needle having a high friction surface part. Furthermore, embodiments may include an open and closed IV catheter system. Embodiments may include a needle hub and a shielded needle system.
Core Innovation
The invention relates to an IV catheter system with a catheter hub body defining a catheter hub cavity and a needle hub arranged in the catheter hub cavity in a retained manner. A needle shield with at least one resilient arm and a base plate having a through hole receives the needle therethrough, and in an assembled state the at least one arm rests upon and is spring loaded by the needle while the needle is slidingly arranged within the through hole of the base plate.
The invention further provides a needle hub geometry in which the needle has a needle bulge at a distal end zone and a high friction surface part covering the needle bulge and extending proximally and distally of the needle bulge. The needle bulge includes opposing flattened sides that are circumferentially interposed by corresponding outwardly extending protrusions, and the high friction surface part extends proximally and distally of the needle bulge along only a portion of a shaft of the needle, with a defined surface roughness range.
During needle withdrawal to release the needle shield from the catheter hub, an outer diameter of the needle bulge is larger than an inner diameter of the through hole of the base plate. In the released state, the at least one arm covers a trip of the needle, and the disclosed arrangements address open IV catheter systems and closed IV catheter systems using valve/connector configurations, including bifunctional valve and septum valve arrangements, to control the system state when the needle is withdrawn.
Claims Coverage
The partial content explicitly identifies three independent claims: clm-00001 (IV catheter system), clm-00017 (needle hub), and clm-00019 (shielded needle system). The inventive coverage centers on the needle bulge geometry, a defined high friction surface part, and a resilient needle shield/base plate through-hole arrangement configured to achieve a release behavior based on bulge diameter versus through-hole diameter.
Needle bulge with opposing flattened sides interposed by outwardly extending protrusions
A needle bulge including opposing flattened sides that are circumferentially interposed by corresponding outwardly extending protrusions.
High friction surface part limited to a portion of the needle shaft with defined surface roughness
A high friction surface part at a distal end zone that covers the needle bulge and extends proximally and distally of the needle bulge along only a portion of a shaft of the needle, having a surface roughness in a defined range and optionally with a defined length.
Needle shield with resilient arm on a base plate having a through hole
A needle shield including at least one resilient arm extending distally from a base plate, the base plate having a through hole for receiving the needle therethrough.
Retained needle-to-cavity cooperation and release behavior based on bulge OD vs through-hole ID
The needle hub is arranged in the catheter hub cavity in a retained manner through cooperation between the needle shield and an inner wall of the catheter hub in said catheter hub cavity, such that the at least one arm rests upon and is spring loaded by the needle; and wherein an outer diameter of the needle bulge is larger than an inner diameter of the through hole of the base plate when the needle hub is withdrawn from the catheter hub to release the needle shield from the catheter hub, and the at least one arm will cover a trip of the needle in a released state.
Shield location between needle bulge and distal side of the needle hub body
The needle shield is located between the needle bulge and a distal side of the needle hub body.
Across the independent claims, the coverage is directed to a specific distal needle bulge geometry combined with a defined high friction surface part that is restricted to a portion of the needle. This is paired with a resilient needle shield/base plate through-hole arrangement configured for a retained assembled state and a release behavior in which bulge outer diameter exceeds the through-hole inner diameter so the resilient arm covers the needle travel in the released state.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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