Ophthalmologic knife
The present invention relates to an ophthalmologic knife for being guided into an incision formed at an eyeball and for widening the width of the incision, the ophthalmologic knife comprising a handle and a blade portion having a flat shape formed at a end portion of the handle. The blade portion is formed with cutting edges arranged on both sides in a narrowing manner toward a front tip of the blade portion, and the front tip of the blade portion is formed with a guide portion arranged between the two cutting edges for guiding the blade portion into the incision formed at the eyeball.
1. An ophthalmologic knife for being guided into an incision formed at an eyeball and for widening the width of the incision, said knife comprising:
a handle having an end portion; and
a blade portion having a flat shape formed at the end portion of said handle, said blade portion having:
a front tip,
two cutting edges arranged on both sides of said blade portion in a narrowing manner toward the front tip of the blade portion, and
a guide portion disposed in a width direction of the blade portion having an arc-shaped edge without a sharp tip disposed between the two cutting edges for guiding the blade portion into the incision formed at the eyeball, having a bottom surface, a top surface, a wedge-shaped cross section formed at a side cross section thereof in a longitudinal direction of the knife, cross sectional slopes formed at both the top surface and bottom surface thereof, and having a greater angle than that of the cutting edges, the top surface having an inclination angle different from that of the bottom surface.
2. The ophthalmologic knife according to claim 1 , wherein the bottom surface of the guide portion has an inclination angle greater than that of the top surface.
3. The ophthalmologic knife according to claim 1 , wherein a flat surface of the guide portion is comprised of a straight portion and an arc portion continuing to the cutting edges on both sides.
4. The ophthalmologic knife according to claim 1 , wherein the guide portion is treated with reflection prevention upon the surface thereof.
5. The ophthalmologic knife according to claim 1 , wherein the arc-shaped linear edge of said guide portion has an angle of from 36 to 150 degrees.
6. The ophthalmologic knife according to claim 1 , wherein the arc-shaped linear edge of said guide portion has an angle of from 36 to 90 degrees.
7. The ophthalmologic knife according to claim 1 , wherein the guide portion has a width of 60% or less that of a maximum width of the knife.