Laser welding of disc to close needle end
AssigneeMedical Instrument Development Laboratories, Inc.
InventorsDavid E-bin Chen, Jeffrey Wayne Etter
Life of this patent
Estimating the term…
Abstract
A cutting apparatus has a handle and a hollow needle having a first end connected to the handle and a second end. The needle outer diameter is about 0.04 inch or less. An end cap is formed from a blank material. Preferably, at least one bridge is formed between the end cap and the blank material. The end cap is welded to the second end to enclose the needle and then the bridge is cut. The end cap has substantially flat inner and outer surfaces. The needle has a port and a hollow cutter that slides within the needle. The cutter has a first end connected to a drive, and a second end having a cutting edge. An outer cutter diameter is less than the needle inner diameter. The drive reciprocates the cutter within the needle to perform a cut.
Claims22
An ophthalmic surgical cutting apparatus, the apparatus comprising:
- a handle;
- a hollow needle, the needle having
- an inner surface defining an inner diameter,
- an outer surface defining an outer diameter that is about 0.04 inch or less,
- a first end connected to the handle,
- a second end opposite the first end,
- an end cap shaped and sized as a plate and formed from a blank material such that at least one bridge is left between the end cap and the blank material after the end cap is formed, the end cap welded to the second end by a weld to enclose the needle, the bridge being cut when the end cap is welded to the second needle end, the end cap having a substantially flat inner surface, and a substantially flat outer surface, and
- a port positioned a tip distance from the outer surface of the end cap;
- and
- a hollow cutter slidably disposed within the needle, the cutter having
- a first end, the first end connected to a drive,
- a second end opposite the first end,
- a cutting edge disposed at the second end of the cutter, and
- an outer cutter surface defining an outer cutter diameter, the outer cutter
- diameter of the cutter being less than the inner diameter of the needle,
- wherein the drive reciprocally moves the cutter within the needle to perform a cutting operation and the cutter travels an overtravel distance past the port.
A method of welding an end cap onto an end of a hollow needle of an opthalmic surgical cutting apparatus, the method comprising:
- forming an end cap from a material;
- forming a port through the side of the needle;
- welding the end cap to the needle to enclose one end of the needle, and;
- cutting the at least one bridge during welding.
Dependencies are inferred from the claim text.