Shaped Phacoemulsification Needle Tips
Phacoemulsification needle tips have indentations formed thereon to allow the needles to be used with torsional motion phaco handpieces and with phaco handpieces producing linear or longitudinal motion.
1 . A phacoemulsification needle, said needle of the type made to be mounted on a phacoemulsification handpiece, said needle comprising:
a hollow needle shaft adapted at a proximal end to be attached to said handpiece;
a hollow needle tip formed at a distal end of said shaft
said tip having a wall terminating in a lip,
said lip defining a mouth;
means formed on said tip to form at least one cutting or emulsifying surface when said handpiece imparts longitudinal motion to said needle; and
means formed on said tip to form at least one cutting or emulsifying surface when said handpiece imparts torsional motion to said needle.
2 . The apparatus as recited in claim 1 wherein at least one said torsional cutting surface is formed at said lip.
3 . The apparatus as recited in claim 2 wherein said torsional cutting surface comprises an indentation formed in said tip wall and including a portion of said lip.
4 . The apparatus as recited in claim 3 wherein said indentation has a pair of planar sides meeting at a crease.
5 . The apparatus as recited in claim 4 wherein said planar sides form an angle of about 90° with said crease.
6 . The apparatus as recited in claim 4 wherein said planar sides meet said lip at an angle of about 90°.
7 . The apparatus as recited in claim 4 wherein said crease is formed to be approximately parallel to said tip wall.
8 . The apparatus as recited in claim 4 wherein said crease is formed at an angle less than 90° to said tip wall.
9 . The apparatus as recited in claim 3 wherein four said indentations are formed spaced about said tip wall.
10 . The apparatus as recited in claim 4 wherein said indentation further comprises a land formed between said planar sides distal from said lip.
11 . The apparatus as recited in claim 10 wherein said longitudinal cutting means comprises said lands and said lip.
12 . The apparatus as recited in claim 1 wherein at least one said torsional cutting surface is formed distal from said lip.
13 . The apparatus as recited in claim 12 wherein said torsional cutting surface comprises an indentation formed in said tip wall.
14 . The apparatus as recited in claim 12 wherein said longitudinal cutting surface comprises said lip.
15 . A method for manufacturing a phacoemulsification needle for use with phacoemulsification handpieces that impart a torsional or longitudinal motion to said needle, said needle of the type including a hollow needle shaft adapted at a proximal end to be attached to said handpiece, a hollow needle tip formed at a distal end of said shaft, said tip having a wall terminating in a lip, said lip defining a mouth, said method comprising the steps of:
positioning said needle tip proximate at least one die block; and
forming at least one indentation on said wall by advancing said die block to contact said wall at said lip.
16 . A method for manufacturing a phacoemulsification needle for use with phacoemulsification handpieces that impart a torsional or longitudinal motion to said needle, said needle of the type including a hollow needle shaft adapted at a proximal end to be attached to said handpiece, a hollow needle tip formed at a distal end of said shaft, said tip having a wall terminating in a lip, said lip defining a mouth, said method comprising the steps of:
positioning said needle tip proximate two opposed of said die blocks; and
forming a first pair of opposed said indentations by advancing said die blocks to contact said wall at said lip.
17 . The method of claim 16 including the step of:
forming said indentations to include a pair of substantially planar sides meeting at a crease.
18 . The method of claim 16 including the steps of:
rotating said tip 90° between said blocks; and
advancing said blocks to form a second pair of said indentations.
19 . A method for manufacturing a phacoemulsification needle for use with phacoemulsification handpieces that impart a torsional or longitudinal motion to said needle, said needle of the type including a hollow needle shaft adapted at a proximal end to be attached to said handpiece, a hollow needle tip formed at a distal end of said shaft, said tip having a wall terminating in a lip, said lip defining a mouth, said method comprising the steps of:
positioning said needle tip proximate at least one die block; and
forming at least one indentation on said wall by advancing said die block to contact said wall at a point distal from said lip.
20 . The method of claim 19 including the steps of:
inserting a block a selected distance into said mouth prior to advancing said blocks; and
forming at least one said indentation by advancing said die blocks to contact said wall at a point greater than said selected distance distal from said lip.
21 . A method for manufacturing a phacoemulsification needle for use with phacoemulsification handpieces that impart a torsional or longitudinal motion to said needle, said needle of the type including a hollow needle shaft adapted at a proximal end to be attached to said handpiece, a hollow needle tip formed at a distal end of said shaft, said tip having a wall terminating in a lip, said lip defining a mouth, said method comprising the steps of:
inserting a block a selected distance into said mouth prior to advancing said blocks;
positioning said needle tip proximate two opposed pairs of said die blocks; and
forming first and second pairs of opposed said indentations by advancing said die blocks to contact said wall at a point greater than said distance distal from said lip.