초록 ▼

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 inter

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.

대표청구항 ▼

A surgical cutting instrument comprising: a diaphragm assembly connectable to a source of pressure, an inner cutter operatively connected to said diaphragm assembly, connectable to a source of vacuum, and defining a cutting surface, an outer cutter positioned outside of said inner cutter and definin

A surgical cutting instrument comprising: a diaphragm assembly connectable to a source of pressure, an inner cutter operatively connected to said diaphragm assembly, connectable to a source of vacuum, and defining a cutting surface, an outer cutter positioned outside of said inner cutter and defining a suction port, a biasing means for biasing said inner cutter against the bias caused by the force of the source of pressure on said inner cutter via said diaphragm assembly, said biasing means and the operation of the source of pressure causing said cutting surface to reciprocate relative to said port and to thereby cut the matter drawn into said port by the operation of the source of vacuum, and said diaphragm assembly including a transverse portion and including flexible means connected to and movable with a proximal end portion of said inner cutter for being expandable and contractible generally along a longitudinal axis of said inner cutter in response to the reciprocation of said inner cutter.