Surgical blade
OwnerRavi Nallakrishnan, Lee T. Nordaninventors
Life of this patent
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Abstract
A surgical blade for use in ophthalmic surgery has a multi-faceted distal end with cutting edges which meet at an angle greater than 90° and preferably 140°, resulting in a blade with a relatively large surface area. An anterior shoulder is positioned intermediate the distal and proximal ends of the blade to direct the blade to dimple down when the blade has been inserted into the cornea a sufficient distance to bring the shoulder into contact with the corneal tissue, allowing the surgeon to make a linear entry into the anterior chamber resulting in a reproducible, leak-free incision by using a straight-in hand motion. The blade is rounded at certain of its lateral edges to avoid snagging the incision when the blade is passed through the cornea.
Claims24
A surgical knife blade comprising:
- an elongated body having a proximal end, a distal end, opposed anterior and posterior surfaces, and first and second opposed longitudinal sides extending between said proximal end and said distal end;
- a compound faceted cutting face positioned at said distal end and extending from said first longitudinal side to said second longitudinal side,
- said cutting face having first and second anterior bevels formed at said distal end;
- first and second cutting edges located at said distal end,
- said first and second cutting edges being formed by the intersection of said first and second anterior bevels with said posterior surface,
- said intersection of said first and second anterior bevels with said posterior surface positioning said first and second cutting edges to be substantially coplanar with said posterior surface at said distal end;
- first and second side facets,
- said first side facet contiguous with said first anterior bevel and extending from said first anterior bevel to said first longitudinal side,
- said second side facet contiguous with said second anterior bevel and extending from said second anterior bevel to said second longitudinal side,
- said first and second cutting edges being disposed at an angle greater than 90° with respect to each other as measured in the plane of said posterior surface.
A surgical knife blade comprising:
- an elongated body having a proximal end, a distal end, opposed anterior and posterior surfaces, and first and second opposed longitudinal sides extending between said proximal end and said distal end;
- a compound faceted cutting face positioned at said distal end and extending from said first lateral side to said second lateral side,
- said cutting face having first and second anterior bevels formed at said distal end;
- first and second cutting edges located at said distal end,
- said first and second cutting edges being formed by the intersection of said first and second anterior bevels with said posterior surface,
- said intersection of said first and second anterior bevels with said posterior surface positioning said first and second cutting edges to be substantially coplanar with said posterior surface at said distal end;
- first and second side facets,
- said first side facet contiguous with said first anterior bevel and extending from said first anterior bevel to said first longitudinal side,
- said second side facet contiguous with said second anterior bevel and extending from said second anterior bevel to said second longitudinal side,
- said first and second cutting edges being disposed at an angle greater than 90° with respect to each other as measured in the plane of said posterior surface;
- and
- a top shoulder formed on and extending a distance above said anterior surface intermediate said distal and proximal ends.
Dependencies are inferred from the claim text.