Surgical cutting instrument with reciprocating inner cutter
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United States of America Patent
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Jan 22, 1991
Issued Date -
N/A
app pub date -
Mar 16, 1990
filing date -
Nov 5, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surgical cutting instrument such as for use in intraocular surgery having a handpiece with an elongate probe extending forward 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.
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