Surgery – Instruments – Light application
Reexamination Certificate
2005-12-30
2011-10-04
Yao, Sam (Department: 3769)
Surgery
Instruments
Light application
C606S009000, C606S013000, C607S089000
Reexamination Certificate
active
08029501
ABSTRACT:
The present invention provides a method of laser processing of materials, specifically laser induced ablation processes for laser removal of material particularly important in medical and dental applications in which the laser removal of material should be done in such a way as to not damage any of the surrounding soft or hard biomaterial. The ablation process is achieved by impulsive heat deposition (IHD) by direct and specific excitation of short lived vibrations or phonons of the material in such a way as to not generate highly reactive and damaging ions through multiphoton absorption. The heat deposition and ensuing ablation process under prescribed time and wavelength conditions for laser irradiation is achieved faster than heat transfer to surrounding tissue by either acoustic or thermal expansion or thermal diffusion that otherwise would lead to excess heat related damage. The result is that all the deposited laser energy is optimally channelled into the ablation process in which the inertially confined stresses from both photomechanical expansion forces and thermally driven phase transitions and associated volume changes constructively interfere to drive the most efficient ablation process possible with minimal damage to surrounding areas by either ionizing radiation or heat effects. By choosing a specific range of wavelengths, spatial and temporal shaping of infrared laser pulses, the energy can be optimally deposited in a manner that further increases the efficiency of the ablation process with respect to minimizing collateral damage.
REFERENCES:
patent: 5656186 (1997-08-01), Mourou et al.
patent: 5720894 (1998-02-01), Neev et al.
patent: 5782822 (1998-07-01), Telfair et al.
patent: RE37504 (2002-01-01), Lin
patent: RE37585 (2002-03-01), Mourou et al.
patent: 6552301 (2003-04-01), Herman et al.
patent: 6621040 (2003-09-01), Perry et al.
patent: 6824541 (2004-11-01), Boutoussov et al.
patent: 6943964 (2005-09-01), Zhang et al.
patent: 2002/0016587 (2002-02-01), Furumoto
patent: 2004/0005349 (2004-01-01), Neev
patent: 2004/0195221 (2004-10-01), Haglund, Jr. et al.
patent: 2006/0195072 (2006-08-01), Miller
patent: 0 502 101 (1990-12-01), None
patent: 0 589 468 (1994-03-01), None
A. Vogel and V. Venugopalan. “Mechanisms of pulsed laser ablation of biological tissues.”,Chemical Reviews103.2 (2003) 577-644.
F. H. Loesel, M.H. Niemz, J.F. Billie, T. Juhasz. “Laser-induced optical breakdown on hard and soft tissues and its dependence on th pulse duration: Experiment and model.”IEEE J. Quant. Elect.32.10 (1996) 1717-22.
L. Genberg, Q. Bao, S. Gracewske, and R.J.D. Miller, “Picosecond Transient Thermal Phase Grating Spectroscopy—A New Approach to the Study of Vibrational-Energy Relaxation Processes in Proteins,” Chem. Phys. 131 (1989) 81.
B. Rethfeld, K. Sokolowski-Tinten and D. von der Linde :Ultrafast Thermal Melting of Laser-Excited Solids by Homogeneouse Nucleation, Phys. Rev. B 65.9 (2002) 092103.
E. Leveugle, D.S. Ivanov, and L.V. Zhigilei, “Photomechanical Spallation of Molecular and Metal Targets: Molecular Dynamics Study”, Appl. Phys. A 79, (2004) 1643.
G. Edwards et al., “Tissue ablation by a free-electron laser tuned to the amide II band,” Nature 371 (1994) 416.
Laser-induced breakdown and damage in bulk transparent materials induced by tighty focused femtosecond laser pulses, Schaffer et al, Measurement and Science Technology, 12(200I) 1784-1794 Oct. 9, 2001.
A study of the deterministic character of optical damage by femtosecond laser pulses and applications to nanomachining, Joglekar et al, Applied Physics B77,25-30, Jul. 30, 2003.
Ultraviolet diffraction limited nanosurgery of live biological tissues, Colombelli et al, Review of Scientific Instruments vol. 75, No. 2, p. 472-478, Feb. 2004.
Breaddown threshold and localized electron density in water induced by ultrashort lase pulses, Fan et al, Journal of Applied Physics, vol. 91, No. 4, Feb. 15, 2002 p. 2530-2536.
Femtosecond laser ablation ICP-MS, Russo et al, j. Anal. At. Spectrom, 2002, 17, 1072-1075.
Frequency dependence of the ablation of pig tissue with an IR-FEL: a microspectroscopic analysis, Glotin et a, SPIE vol. 3775 Jul. 1999, 113-117.
Attodyne Inc.
Crandall Lynsey
Hill & Schumacher
Schumacher Lynn C.
Yao Sam
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