Surgery – Instruments – Corneal cutter or guide for corneal cutter
Reexamination Certificate
2000-06-02
2003-12-16
Milano, Michael J. (Department: 3731)
Surgery
Instruments
Corneal cutter or guide for corneal cutter
C604S022000
Reexamination Certificate
active
06663644
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a blade assembly that can be assembled into a medical device that is used to cut a cornea.
2. Prior Art
There have been developed a number of different surgical techniques to correct hyperopic or myopic conditions of a human eye. U.S. Pat. No. 4,840,175 issued to Peyman discloses a procedure wherein a thin layer of the cornea tissue is cut and removed from the cornea. A laser beam is then directed onto the exposed corneal tissue in a predetermined pattern. The laser beam ablates corneal tissue and changes the curvature of the eye. This procedure is sometimes referred to as Laser in situ Keratomileusis (LASIK).
U.S. Pat. No. Re 35,421 issued to Ruiz et al. discloses a device for cutting a cornea in a LASIK procedure. Such a device is commonly referred to as a microkeratome. The Ruiz microkeratome includes a ring that is placed onto a cornea and a blade that is located within an opening of the ring. The device also contains a drive mechanism which moves the blade across the cornea in a first direction while the blade moves in a reciprocating transverse direction to cut the eye. The device can create a lamella flap of the cornea which is flipped back so that the stromal bed of the cornea can be ablated with a laser.
U.S. Pat. No. 6,051,009 issued to Hellenkamp et al. discloses a microkeratome that is sold under the trademark HANSATOME. The HANSATOME microkeratome moves the blade in an arcuate path about the cornea. The HANSATOME includes a disposable blade assembly that can be readily loaded and removed from the device. The blade assembly includes a blade holder that is attached to a cutting blade. The blade holder has a recess that receives the end of a drive shaft. Rotation of the output shaft both moves the blade in an arcuate path and moves the blade in a back and forth motion to create the lamella flap of the cornea.
It is critical to control the depth of the cut to prevent a deep or shallow cut of the cornea. The depth of the cut is a function of the distance between the cutting edge of the blade and a reference surface of the blade holder. The HANSATOME blade holder is attached to the cutting blade by a pair of plastic protrusions that extend from the blade holder through corresponding apertures of the blade. The plastic protrusions located on the underside of the blade holder are then ultrasonically welded to the top side of the blade. The accuracy of the distance between the cutting edge and the reference surface, and thus the depth of the cut into the cornea, is dependent upon the mechanical tolerance between the cutting edge and the aperture of the blade, and the mechanical tolerance between the protrusions and the reference surface of the blade holder. This tolerance “build up” can reduce the predictability of the cutting depth. It would be desirable to provide a blade assembly and process for assembling the blade assembly that would tightly control the tolerance between the cutting edge and the reference surface and thus the depth of the cut.
BRIEF SUMMARY OF THE INVENTION
One embodiment of the present invention is a blade assembly that can be assembled to a medical device used to cut a cornea. The blade assembly may include a blade holder that is coupled to a blade. The blade has a notch.
REFERENCES:
patent: 1841968 (1932-01-01), Lowry
patent: 1847658 (1932-03-01), Lasker
patent: 2070281 (1937-02-01), Leggiadro
patent: 2457772 (1948-12-01), Brown
patent: 2480737 (1949-08-01), Jayle
patent: RE23496 (1952-05-01), Seeler
patent: 2708437 (1955-05-01), Hutchins
patent: 2824455 (1958-02-01), Ristow et al.
patent: 3033196 (1962-05-01), Hay
patent: 3252623 (1966-05-01), Corbin et al.
patent: 3266494 (1966-08-01), Brownrigg et al.
patent: 3308828 (1967-03-01), Pippin
patent: 3399677 (1968-09-01), Gould et al.
patent: 3511162 (1970-05-01), Truhan
patent: 3561429 (1971-02-01), Jewett
patent: 3583403 (1971-06-01), Pohl
patent: 3589363 (1971-06-01), Banko
patent: 3624821 (1971-11-01), Henderson
patent: 3693613 (1972-09-01), Kelman
patent: 3723030 (1973-03-01), Gelfand
patent: 3752161 (1973-08-01), Bent
patent: 3763862 (1973-10-01), Spieth
patent: 3812855 (1974-05-01), Banko
patent: 3815604 (1974-06-01), O'Malley et al.
patent: 3841799 (1974-10-01), Spinosa et al.
patent: 3842839 (1974-10-01), Malis et al.
patent: 3882872 (1975-05-01), Douvas et al.
patent: 3884238 (1975-05-01), O'Malley et al.
patent: 3899829 (1975-08-01), Storm et al.
patent: 3903881 (1975-09-01), Weigl
patent: 3913584 (1975-10-01), Walchle et al.
patent: 3920014 (1975-11-01), Banko
patent: 3930505 (1976-01-01), Wallach
patent: 3977425 (1976-08-01), Hayashida
patent: 3982539 (1976-09-01), Muriot
patent: 3983474 (1976-09-01), Kuipers
patent: 3986512 (1976-10-01), Walliser
patent: 4004590 (1977-01-01), Muriot
patent: 4011869 (1977-03-01), Seiler, Jr.
patent: 4034712 (1977-07-01), Duncan
patent: 4043342 (1977-08-01), Morrison, Jr.
patent: 4108182 (1978-08-01), Hartman et al.
patent: 4135515 (1979-01-01), Muriot
patent: 4137920 (1979-02-01), Bonnet
patent: 4168707 (1979-09-01), Douvas et al.
patent: 4173980 (1979-11-01), Curtin
patent: 4178707 (1979-12-01), Littlefield
patent: 4204328 (1980-05-01), Kutner
patent: 4205682 (1980-06-01), Crock et al.
patent: 4210146 (1980-07-01), Banko
patent: 4217993 (1980-08-01), Jess et al.
patent: 4223676 (1980-09-01), Wuchinich et al.
patent: 4245815 (1981-01-01), Willis
patent: 4246902 (1981-01-01), Martinez
patent: 4274411 (1981-06-01), Dotson, Jr.
patent: 4301802 (1981-11-01), Poler
patent: 4304262 (1981-12-01), Icking
patent: 4308385 (1981-12-01), Goorden
patent: 4308835 (1982-01-01), Abbey
patent: 4314560 (1982-02-01), Helfgott et al.
patent: 4319899 (1982-03-01), Marsh
patent: 4320761 (1982-03-01), Haddad
patent: 4344784 (1982-08-01), Deckas et al.
patent: 4354838 (1982-10-01), Hoyer et al.
patent: 4395258 (1983-07-01), Wang et al.
patent: 4396386 (1983-08-01), Kurtz et al.
patent: 4427427 (1984-01-01), DeVecchi
patent: 4428748 (1984-01-01), Peyman et al.
patent: 4429696 (1984-02-01), Hanna
patent: 4445517 (1984-05-01), Feild
patent: 4474411 (1984-10-01), Peters et al.
patent: 4475904 (1984-10-01), Wang
patent: 4476862 (1984-10-01), Pao
patent: 4479717 (1984-10-01), Cornillault
patent: 4481948 (1984-11-01), Sole
patent: 4493695 (1985-01-01), Cook
patent: 4493698 (1985-01-01), Wang et al.
patent: 4522371 (1985-06-01), Fox et al.
patent: 4523911 (1985-06-01), Braetsch et al.
patent: 4524948 (1985-06-01), Hall
patent: 4530357 (1985-07-01), Pawloski et al.
patent: 4531934 (1985-07-01), Kossovsky et al.
patent: 4540406 (1985-09-01), Miles
patent: 4555645 (1985-11-01), Atkinson
patent: 4560395 (1985-12-01), Davis
patent: 4589414 (1986-05-01), Yoshida et al.
patent: 4598729 (1986-07-01), Naito et al.
patent: 4647209 (1987-03-01), Neukomm et al.
patent: 4660556 (1987-04-01), Swinger et al.
patent: 4660970 (1987-04-01), Ferrano
patent: 4662370 (1987-05-01), Hoffmann et al.
patent: 4665914 (1987-05-01), Tanne
patent: 4674499 (1987-06-01), Pao
patent: 4674503 (1987-06-01), Peyman et al.
patent: 4678459 (1987-07-01), Onik et al.
patent: 4688570 (1987-08-01), Kramer et al.
patent: 4690099 (1987-09-01), Gregan et al.
patent: 4701049 (1987-10-01), Beckmann et al.
patent: 4705395 (1987-11-01), Hageniers
patent: 4706687 (1987-11-01), Rogers et al.
patent: 4723545 (1988-02-01), Nixon et al.
patent: 4743770 (1988-05-01), Lee
patent: 4757814 (1988-07-01), Wang et al.
patent: 4767403 (1988-08-01), Hodge
patent: 4768506 (1988-09-01), Parker et al.
patent: 4770654 (1988-09-01), Rogers et al.
patent: 4782239 (1988-11-01), Hirose et al.
patent: 4782849 (1988-11-01), Hodge
patent: 4791934 (1988-12-01), Brunnett
patent: 4805615 (1989-02-01), Carol
patent: 4805616 (1989-02-01), Pao
patent: 4807623 (1989-02-01), Lieberman
patent: 4819635 (1989-04-01), Shapiro
patent: 4825091 (1989-04-01), Breyer et al.
patent: 4828306 (1989-05-01), Blatt
patent: 4830047 (1989-05-01), Hodge
patent: 4837857 (1989-06-01), Scheller et al.
patent: 4838281 (1989-06-01), Rogers et al.
patent: 4840175 (1989-06-01), Peyman
patent
Dennewill James Robert
Hughes Gregg
Moyer Mark
Ross Rod
Irell & Manella LLP
Med-Logics, Inc.
Milano Michael J.
Nguyen Victor
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