Devices for applying liquid to skin
US11052232B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jul 5, 2019 |
| Grant date | Jul 6, 2021 |
| Priority date | — |
| Expiry date | Mar 11, 2040 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2209/082
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A needle assembly for a liquid applicator comprises housing with longitudinal channel. The channel comprises upper and lower open ends. A needle bundle is movably mounted in the channel, which comprises needle shaft and needles attached thereto. A biasing member is configured and mounted for (i) biasing the needle bundle longitudinally towards a retracted position and (ii) biasing the needles laterally towards a needle-guiding side wall of the housing adjacent the lower open end. The biasing member is configured and mounted to form a fluid seal between the lower and upper open ends. The biasing member comprises an elastic tubular section with opposite sides. The first side has a first rectified length. The second side has a second rectified length longer than the first rectified length so that the second side is less tensioned than the first side to bias the needles towards the needle-guiding side wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.