Administration apparatus for medical use
US11058817B2 · kind B2 · utility
5Cited by
21References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2018 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Jul 11, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/583
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An expansion/compression mechanism of a piston rod assembly is composed of a bush shaft, a first cylindrical piston rod that is screwed with the bush shaft, a second cylindrical piston rod that is screwed with the first piston rod, and a piston rod holding member for housing the bush shaft and these piston rods. Therefore, the piston rods move linearly in multiple stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.