Needle assembly for liquid applicator
US12246156B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 28, 2022 |
| Grant date | Mar 11, 2025 |
| Priority date | — |
| Expiry date | Mar 22, 2043 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/0216
- 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 elastic 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 first portion and a second portion thinner than the first portion, which are separated by a boundary. The boundary extends helically between the first and second ends of the tubular member. The first portion may include one or more helical ridges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.