Surgical cutting instrument
First Claim
1. A surgical cutting instrument comprisinghub means,an elongate probe extending from said hub means includinga tubular outer member having a distal end with an aperture in a side wall thereof, andan inner cutting member slidably disposed in said outer member having a distal end defining a cutting edge positioned at said distal end of said outer member and an elongate body extending from said distal end of said inner cutting member and having a cut away portion running therealong from a position adjacent said cutting edge to said hub means, the cross sectional configuration of said elongate body along said cut away portion being partially cylindrical ranging from 180°
- to 220°
;
drive means for reciprocating said inner cutting member and said outer member relative to each other to move said cutting edge of said inner cutting member back and forth past said aperture in said outer member; and
suction means communicating with said probe adjacent said hub means to remove sustance cut by relative reciprocation of said inner cutting member and said outer member whereby said cut away portion along said elongate body of said inner cutting member provides increased cross sectional flow area along said probe and causes relative reciprocation of said inner cutting member and said outer member to agitate the cut substance to prevent clogging of said probe.
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Accused Products
Abstract
A surgical cutting instrument, particularly useful for ophthalmic surgery, includes an elongate probe formed of an outer tubular member having an aperture in the distal end thereof and an inner cutting member having a peripheral cutting edge at the distal end thereof and an elongate body with an opening running therealong and carrying a piston disposed in a chamber of a hub through which the inner cutting member extends and which communicates with a source of suction, a drive unit for reciprocating the inner cutting member relative to the outer member, the opening along the inner cutting member forming an increased cross sectional flow area for cut substances being withdrawn by suction and the relative reciprocation of the inner and outer members coupled with increasing and decreasing pressure from the piston agitating the cut substances to prevent clogging of the probe. A finger-operated valve is formed of an elastic tubing stretched over the closed end of a rigid tube communicating with the chamber of the hub, the rigid tube having an opening in a side wall adjacent the closed end, which opening is normally sealed by the elastic tubing and can be opened by applying a force to the tubing at a position opposite the opening.
435 Citations
12 Claims
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1. A surgical cutting instrument comprising
hub means, an elongate probe extending from said hub means including a tubular outer member having a distal end with an aperture in a side wall thereof, and an inner cutting member slidably disposed in said outer member having a distal end defining a cutting edge positioned at said distal end of said outer member and an elongate body extending from said distal end of said inner cutting member and having a cut away portion running therealong from a position adjacent said cutting edge to said hub means, the cross sectional configuration of said elongate body along said cut away portion being partially cylindrical ranging from 180° - to 220°
;drive means for reciprocating said inner cutting member and said outer member relative to each other to move said cutting edge of said inner cutting member back and forth past said aperture in said outer member; and suction means communicating with said probe adjacent said hub means to remove sustance cut by relative reciprocation of said inner cutting member and said outer member whereby said cut away portion along said elongate body of said inner cutting member provides increased cross sectional flow area along said probe and causes relative reciprocation of said inner cutting member and said outer member to agitate the cut substance to prevent clogging of said probe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- to 220°
Specification