Surgical instrument ringing a titanium needle with a node of minimum amplitude in a substantially cylindrical portion of the needle
US9216035B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Mar 26, 2012 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Mar 30, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/22018
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical instrument and method, for example to accomplish phacoemulsification, are disclosed. The surgical instrument includes a handpiece that has a piezoelectric transducer, and a titanium needle having a free distal tip and a supported end that is attached to the handpiece. The titanium needle has a substantially cylindrical portion with an outer diameter in the range 0.5 mm to 1.5 mm and a length in the range 12 mm to 37 mm. A circuit drives the piezoelectric transducer to periodically longitudinally expand and longitudinally contract at a driving frequency. The driving frequency is selected to ring the titanium needle with a standing wave that is characterized by longitudinal expansion and longitudinal contraction, the standing wave having a distal node of minimum amplitude in the substantially cylindrical portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.