Capsule polishing device and method for capsule polishing
View Patent ↗Various embodiments of a capsule polishing device include a resistive-heating element including an electrically resistive, superelastic wire forming a loop between first and second ends of the superelastic wire. The first and second ends of the loop may at least partially extend from a planar face defined by the loop, to an insulating portion. In some embodiments, the capsule polishing device may be configured to perform active capsule polishing through a combination of hyperthermia of LECs and mechanical abrasion of the capsule surface. In some embodiments, at least a side and end portion of the loop of the capsule polishing device may be shaped to follow a contour of the capsule bag. The loop may be heated to approximately 40 to 47 degrees Celsius to destroy LECs (other temperatures are also possible). In some embodiments, the loop may include a roughened surface to increase mechanical abrasion.
1. A method for capsule polishing, comprising:
performing phacoemulsification to remove a lens from an eye;
inserting a capsule polishing device comprising a bare wire resistive-heating element loop into the eye by ejecting the bare wire resistive-heating element loop in a collapsed loop configuration through an insertion sleeve into the eye whereby the bare wire resistive-heating element loop expands into an expanded loop configuration upon exiting the insertion sleeve, wherein the bare wire resistive-heating element loop comprises a bare electrically resistive, superelastic wire having first and second ends, the expanded loop configuration comprising the bare electrically resistive, superelastic wire formed in an open loop configuration having a gap between the first and second ends, wherein the first and second ends are adjacent to each other;
electrically heating the bare wire resistive-heating element loop through application of radio frequency power to the loop, wherein electrically heating the bare wire resistive-heating element loop comprises providing a current to the first end of the loop and receiving the current back through the second end of the loop after the current has traveled around the loop;
moving the heated bare wire resistive-heating element loop around a capsule surface of a lens capsule bag while applying heat and mechanical abrasion to destroy lens epithelial cells (LECs) without the heated bare wire resistive-heating element loop cutting through the lens capsule, wherein at least a side and end portion of the bare wire resistive-heating element loop are shaped to follow a contour of the lens capsule bag such that the heated bare wire resistive-heating element loop directly contacts the LECs during destruction of the LECs; and
withdrawing the capsule polishing device from the eye by retracting the bare wire resistive-heating element loop into the insertion sleeve where the bare wire resistive-heating element loop collapses back into the collapsed loop configuration for withdrawal from the eye.
2. The method of claim 1 , wherein a length of the bare wire resistive-heating element loop is approximately in a range of 4 to 5 mm.
3. The method of claim 1 , wherein a width of the bare wire resistive-heating element loop is approximately in a range of 2.5 to 3.5 mm.
4. The method of claim 1 , wherein electrically heating the bare wire resistive-heating element loop comprises heating the bare wire resistive element loop to a temperature of approximately 40 to 47 degrees Celsius to destroy LECs.
5. The method of claim 1 , wherein the bare superelastic wire is made of a nickel titanium alloy.
6. The method of claim 1 , wherein the resistive-heating element loop has a roughened surface and wherein applying mechanical abrasion comprises pressing the roughened surface against the capsule surface.
7. The method of claim 1 , wherein the resistive-heating element loop has a surface with an applied abrasive and wherein applying mechanical abrasion comprises pressing the surface with an applied abrasive against the capsule surface.