Phacoemulsification Needle Tips for Torsional Motion
Phacoemulsification needle tips are provided with emulsifying surfaces enhancing their capacity to emulsify eye tissue when used with phaco handpieces that vibrate such needles torsionally. In one version, prongs are formed on the tip proximate the tip mouth and are bent to be positioned to provide additional emulsifying surfaces in both needle rotational directions. In another version, additional emulsifying surfaces are formed on the interior of the tip or the needle.
1 . A phacoemulsification needle for use with a phaco handpiece, said needle comprising:
a hollow shaft having a proximal end, a distal end and a central axis,
said proximal end adapted to be attached to said handpiece;
a needle tip formed at said distal end of said shaft,
said tip having a side wall terminating in a lip;
said lip defining a tip mouth;
means formed on said tip comprising an emulsifying surface when said tip is rotated torsionally about said axis,
said surface means formed at said lip and extending into said mouth toward said axis.
2 . The apparatus as recited in claim 1 wherein said surface means comprises at least one prong.
3 . The apparatus as recited in claim 2 wherein said at least one prong has at least a first edge surface,
said edge surface comprising an emulsifying surface when said needle is rotated torsionally in a first direction about said axis.
4 . The apparatus as recited in claim 2 wherein each said at least one prong has at least a first edge surface and a second edge surface,
said first edge surface comprising a first emulsifying surface when said needle is rotated torsionally in a first direction about said axis, and
said second edge surface comprising a second emulsifying surface when said needle is rotated torsionally in a second direction about said axis.
5 . The apparatus as recited in claim 4 wherein at least one said edge surface has a bevel formed thereon.
6 . The apparatus as recited in claim 2 wherein at least one said prong is formed at said lip and extends at about a 90° angle to said tip side wall.
7 . The apparatus as recited in claim 2 wherein at least one said prong is formed at said lip and comprises a first prong segment that extends at about a 90° angle to said tip side wall and a second prong segment extending at an angle from said first prong segment and into said mouth.
8 . The apparatus as recited in claim 2 wherein at least one said prong is formed at said lip and comprises a curved prong segment that extends from said lip toward said axis.
9 . The apparatus as recited in claim 1 wherein said side wall has a square cross-section, forming a square tip.
10 . The apparatus as recited in claim 9 wherein at least one said prong is formed at the midpoint of one side of said square tip.
11 . The apparatus as recited in claim 1 wherein at least one said prong is substantially triangular in shape.
12 . The apparatus as recited in claim 2 wherein said surface means comprises four said prongs.
13 . A phacoemulsification needle for use with a phaco handpiece, said needle comprising:
a hollow shaft having a proximal end, a distal end and a central axis,
said proximal end adapted to be attached to said handpiece;
a needle tip formed at said distal end of said shaft,
said tip having an outer side wall and an inner side wall, said sidewalls terminating in and forming a lip;
said lip defining a tip mouth;
means formed on said tip comprising an emulsifying surface when said tip is rotated torsionally about said axis,
said surface means formed extending from said lip into said mouth in the direction of said axis.
14 . The apparatus as recited in claim 13 wherein said surface means comprises at least one scallop formed longitudinally along said inner side wall.
15 . The apparatus as recited in claim 14 wherein each said at least one scallop comprises at least a first edge surface,
said edge surface comprising an emulsifying surface when said needle is rotated torsionally in a first direction about said axis.
16 . The apparatus as described in claim 14 wherein each said at least one scallop has at least a first edge surface and a second edge surface,
said first edge surface comprising a first emulsifying surface when said needle is rotated torsionally in a first direction about said axis, and
said second edge surface comprising a second emulsifying surface when said needle is rotated torsionally in a second direction about said axis.
17 . The apparatus as recited in claim 16 wherein said surface means comprises six said scallops.
18 . A phacoemulsification needle for use with a phaco handpiece, said needle comprising:
a planar plate of material suitable for the manufacture of said phacoemulsification needle,
said plate having at least first and second opposed edges, a third edge extending from said first edge to said second edge and a plate surface extending between said edges,
said first edge rolled toward said second edge about a central axis to form said plate into a spiral shape,
said second edge fastened to said surface at a seam thereby forming a tube with the portion of said plate extending from said seam to said first edge held in said spiral shape,
said third edge forming a needle mouth.
19 . The apparatus as recited in claim 18 wherein said needle mouth is formed at an angle with respect to said axis.
20 . The apparatus as recited in claim 19 wherein said plate is titanium.
21 . A method for making a phacoemulsification needle for use with a phaco handpiece, said needle of the type having a hollow shaft having a proximal end, a distal end and a central axis, said proximal end adapted to be attached to said handpiece, a needle tip formed at said distal end of said shaft, said tip having a side wall terminating in a lip, said lip defining a tip mouth, said method comprising the steps of:
severing portions of said side wall proximate said lip;
removing said side wall portions to form at least one prong extending from said lip; and
bending said prong toward said axis to position said prong at said tip mouth.
22 . The method as recited in claim 21 including the step of forming a plurality of said prongs.
23 . The method as recited in claim 22 including the step of forming said at least one prong to extend at an angle of about 90° to said side wall.
24 . The method as recited in claim 22 including the step of forming said at least one prong to have a curved prong segment that extends from said lip toward said axis.
25 . The method as recited in claim 22 including the steps of forming said at least one prong with a first edge surface and a second edge surface,
said first edge surface comprising a first emulsifying surface when said needle is rotated torsionally in a first direction about said axis, and
said second edge surface comprising a second emulsifying surface when said needle is rotated torsionally in a second direction about said axis.