| 摘要 |
A safety needle cap assembly for needles automatically caps the used needle the instant the needle is withdrawn from a patient. An elastic compressible sheath is attached to a safety needle cup shaped cap and is under compression with the cap in a retracted position exposing the needle tip for use. The cap is restrained in a rearward needle exposed state by one or more extension members extending rearwardly from the cap over the syringe hub. The extension may be a thin film, a string, a flexible rod or an articulated rod which are pressed against the hub by an outer packaging enclosure to retain the cap in the needle exposed state during shipping and handling prior to use. During removal of the enclosure for use of the needle, the extension is then pressed against the hub by the user in one embodiment, or a syringe grip or catheter body in other embodiments, holding the needle exposed ready for use. During use, the extension member is released while the needle is in the patient tissue and the needle remains exposed with the cap retracted. When the needle is removed from the patient, the elastic compression load on the cap is released, causing the safety needle cap to extend to its normal position and snap over the used needle tip automatically without operator assistance, the cap having a needle hole which displaces to an offset position when released to capture the needle in the cap cavity.
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