Suction conduit switching apparatus and endoscope
US9717395B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 2015 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Dec 6, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K11/0716
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A piston is inserted into a piston passage of a cylinder. The piston is displaced between a first position of a non-contact state and a second position by a pressing operation. At the first position, a suction source connection port of the cylinder faces a circumferential groove of the piston and a suction source conduit communicates with an outside atmosphere. At the second position, the suction source connection port faces an outer peripheral surface opening and the suction source conduit communicates with a suction connection port. A V-shaped opening portion as a correction opening portion is formed in the outer peripheral surface opening. The V-shaped opening portion causes an increment of a communication opening width at which the suction source connection port overlaps with the outer peripheral surface opening to be three times or less an increment of a pressing stroke of the piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.