Hollow needle for an ophthalmic surgical instrument
First Claim
1. An ophthalmic surgical instrument for high frequency lens crushing and removing the lens debris by suction, comprising:
- a hollow needle having a ring-shaped distal end;
a suction channel extending through said hollow needle and having a longitudinal axis; and
a segment radially expanding toward said ring-shaped distal end and comprising;
a plurality of bores arranged coaxially with said suction channel and extending from the distal end into the suction channel, said bores having walls with stepped diameters separated by ring shoulders; and
a plurality of cuts formed on at least one of the distal end and ring shoulders, said cuts expanding toward said at least one of said distal end and ring shoulders, and having side surfaces inclined relative to said at least one of said distal end and ring shoulders.
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Accused Products
Abstract
A hollow needle for use as an ultrasonic probe for crushing lenses during ophthalmic surgery. The needle has a suction channel extending toward the distal end into a radially expanding segment. The segment having a plurality of coaxial bores having stepped diameters forming ring shoulders. The bores extend from the distal end into the hollow needle. A plurality of tetrahedrally-shaped cuts are arranged around the circumference of at least one of the ring shoulders or the distal end of the needle. The cuts substantially enlarge the reflecting surface area for the ultrasonic waves and thereby permit intensive admission of ultrasound to the operative tissue. The ring shoulders may be additionally or alternatively be undercut for obtaining additional reflecting surfaces.
36 Citations
12 Claims
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1. An ophthalmic surgical instrument for high frequency lens crushing and removing the lens debris by suction, comprising:
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a hollow needle having a ring-shaped distal end; a suction channel extending through said hollow needle and having a longitudinal axis; and a segment radially expanding toward said ring-shaped distal end and comprising; a plurality of bores arranged coaxially with said suction channel and extending from the distal end into the suction channel, said bores having walls with stepped diameters separated by ring shoulders; and a plurality of cuts formed on at least one of the distal end and ring shoulders, said cuts expanding toward said at least one of said distal end and ring shoulders, and having side surfaces inclined relative to said at least one of said distal end and ring shoulders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An ophthalmic instrument for high frequency lens crushing and removal of lens debris by suction, comprising
a hollow needle having a ring-shaped distal end; -
a suction channel extending through said hollow needle; and a segment radially expanding toward said distal end and comprising a plurality of bores extending coaxially with the suction channel from the distal end into the hollow needle and having stepped diameters separated by ring shoulders, wherein at least one ring shoulder is undercut to form a reflecting surface facing away from said distal end. - View Dependent Claims (12)
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11. An ophthalmic surgical instrument for high frequency lens crushing and removal of the lens debris by suction, comprising:
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a hollow needle having a ring-shaped distal end; a suction channel extending through said hollow needle; and a segment radially expanding toward said ring-shaped distal end and comprising; a plurality of bores arranged coaxially with each other and said suction channel and extending from the distal end into the suction channel, said bores having stepped diameters separated by ring shoulders; and a plurality of cuts formed on at least one of the distal end and ring shoulders, said cuts having shapes expanding toward said at least one of said distal end and ring shoulders, and having side surfaces inclined relative to said at least one of said distal end and ring shoulders; wherein at least one ring shoulder is undercut to form a reflecting surface facing away from the distal end.
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Specification