Ophthalmic incisional procedure instrument and method

An ophthalmic incisional instrument for making limbal relaxing incisions (LRIs) on a patient's eye having a sclera, a cornea, and a corneal limbus, the instrument comprising:

• a docking piece having proximal and distal ends;
• said docking piece proximal end configured for placement on the sclera of said patient's eye;
• a cutting piece having proximal and distal ends and a rotational axis extending between said cutting piece ends;
• said cutting piece configured for insertion within said docking piece and for rotation relative to said docking piece about said rotational axis in an assembled configuration of the instrument;
• said cutting piece mounting two cutting blades, each cutting blade configured for extending into said patient's eye in said assembled configuration;
• a guide template having proximal and distal ends;
• said guide template proximal end configured for attachment to said docking piece distal end in said assembled configuration;
• said guide template distal end comprising raised stoppers configured for providing lateral, arcuate stops for said cutting piece in said assembled configuration preventing rotation of said cutting piece beyond desired LRI locations;
• said docking piece further comprising a step portion configured for providing a mechanical stop for said cutting piece in said assembled configuration preventing further extension of said cutting blades into said patient's eye beyond a desired LRI depth of cut;
• said docking piece further comprising a suction chamber open at said docking piece proximal end;
• wherein said docking piece is configured for releasable attachment to the sclera of said patient's eye via sub-atmospheric pressure in said suction chamber;
• said cutting blades configured for forming arcuate LRIs in said patient's eye coaxial to said rotational axis;
• said docking piece further comprises an open center accommodating alignment of said docking piece on said sclera of said patient's eye;
• said docking piece, including reticle markings configured for placing and measuring the LRIs on the patient's eye;
• said cutting piece further comprises an open center accommodating better visualization of said LRIs;
• said docking piece further comprises an opening to said suction chamber;
• said suction chamber opening is configured for sealable attachment to a sub-atmospheric pressure source;
• said docking piece further comprises a base handle;
• said base handle comprises a housing;
• said suction chamber opening connects to said base handle housing;
• said base handle housing is configured for housing tubing connecting said suction chamber to said sub-atmospheric pressure source;
• said cutting blades are positioned in 180-degree opposed relation;
• said cutting blades are configured for making symmetrical incisions of equal length, depth, and curvature;
• said cutting piece further comprises a handle on said cutting piece distal end;
• said handle accommodates efficient rotation of said cutting piece relative to said docking piece;
• said docking piece further comprises axis alignment markings;
• said guide template further comprises reference markings for alignment in relation to said docking piece;
• said cutting blades comprise depth-controlled blades for preventing perforation of said patient's eye;
• a spacer mounted on said docking piece distal end said and configured for engaging said cutting piece in a frictional relation;
• and
• said docking piece comprising a first, relatively rigid polymer and said spacer comprising a second, relatively flexible, elastomeric polymer.

An ophthalmic method for making limbal relaxing incisions (LRIs) on a patient's eye having a sclera, a cornea, and a corneal limbus with an incisional instrument including a docking piece having proximal and distal ends, a suction chamber open at the docking piece proximal end, and a step portion;

• a cylindrical cutting piece having proximal and distal ends and a rotational axis extending between the cutting piece ends;
• the cutting piece configured for insertion within the docking piece and for rotation relative to the docking piece about the rotational axis in an assembled configuration of the instrument;
• the cutting piece mounting two cutting blades;
• a guide template having proximal and distal ends;
• the guide template proximal end configured for attachment to the docking piece distal end in the assembled configuration;
• and the guide template distal end comprising raised stoppers and said docking piece further comprises axis alignment markings, and said guide template further comprises reference markings for alignment in relation to said docking piece;
• the method comprising the steps of:
• aligning said docking piece proximal end on the sclera of said patient's eye;
• applying sub-atmospheric pressure to said suction chamber, attaching said docking piece to said sclera of said patient's eye;
• and
• aligning said guide template with said docking piece and said patient's eye as desired and attaching said guide template to said docking piece;
• aligning said cutting piece with said docking piece, said guide template, and said patient's eye as desired;
• placing said cutting piece within said docking piece in said assembled position, inserting said cutting blades into said patient's eye at desired LRI locations;
• said step portion stopping said cutting piece and preventing further extension of said cutting blades into said patient's eye beyond desired LRI depths;
• rotating said cutting piece relative to said docking piece about said rotational axis, forming arcuate LRIs in said patient's eye coaxial to said rotational axis
• said guide template raised stoppers stopping rotation of said cutting piece beyond desired LRI locations;
• and
• removing said cutting piece and said docking piece from said patient's eye.