Needle assembly for liquid applicator
US12409306B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 24, 2023 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Mar 26, 2044 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2210/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A needle assembly for a liquid applicator comprises a housing, a needle bundle, and an elastic tubular member. The housing comprises a longitudinal channel having upper and lower open ends. The needle bundle is movably mounted in the channel and configured to be driven by a driving shaft to reciprocatively move between a retracted position and an extended position. The tubular member comprises a first end attached to the housing and a second end attached the needle bundle to bias the needle bundle to move longitudinally towards the retracted position. The tubular member comprises a thicker first portion and a thinner second portion separated by a slanted boundary, which extends between the first and second ends in both the longitudinal direction and a lateral perimetral direction. The slanted boundary may be helical. The first portion may include a pair of symmetrically arranged slanted ridges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.