Surgical cutting instrument
US4909249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1987 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Nov 5, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/00544
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical cutting instrument such as for use in intraocular surgery having a handpiece with an elongate probe extending foward from it. The probe has an elongate stationary outer cutter with a port at its tip and an elongate inner cutter with a cutting surface coaxially disposed therein. The interior of the inner cutter communicates with a vacuum source. A spring and diaphragm assembly in the handpiece and powered by a low pressure pump causes the inner cutter to rapidly reciprocate axially in the outer cutter, and body material, such as vitreous material, drawn in through the port by the vacuum source is thereby chopped by the cutting surface and aspirated out of the patient's body through the handpiece. A large adjustment nut on the handpiece allows the size of the port to be easily adjusted. Irrigation fluid can be provided at the surgical site through an infusion cap which is adjustable both longitudinally and rotatably on the handpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.