A method of selecting laser parameters for performing laser-assisted myocardial revascularization to avoid inducing undesired cardiac arrhythmia without synchronization of delivery of laser energy and the patient's cardiac cycle, the method comprising the steps of minimizing the power level of laser energy used, thereby decreasing the overall trauma to the heart, selecting a pulse frequency as great as possible while avoiding adverse summation effects, selecting a pulse width as wide as possible to prevent excessively high peak powers per pulse and not so wide as to cause undesired thermal damage, selecting an energy flux rate, shaping the front end of each pulse of laser energy to provide efficient, non-explosive TMR channeling, and correcting the selected power level, pulse width, pulse frequency and energy flux rate for mechanical events, including method of access to the heart, position of selected portions of myocardium in the heart, temporal duration of the procedure, natural movement of the heart, specific heart geometry, pre-existing heart arrhythmia and other factors causing a predisposition to heart arrhythmia. A method for performing laser-assisted transmyocardial revascularization (TMR) and percutaneous transluminal myocardial revascularization (PTMR) using such laser energy with parameters selected to avoid inducing undesired cardiac arrhythmia, the method comprising the steps of generating laser energy having a predetermined non-square wave shape, a predetermined wavelength, a predetermined energy flux and a predetermined power level, and delivering the laser energy in a plurality of pulses, the plurality of pulses having a predetermined pulse frequency and a predetermined pulse width, to selected portions of myocardium to form TMR and PTMR channels without synchronizing delivery of the laser beam with the cardiac cycle.
RELATED APPLICATIONS
This application is a continuation-in-part of U.S. patent application Serial No. 08/904,222 entitled METHOD FOR NON-SYNCHRONOUS LASER-ASSISTED TRANSMYOCARDIAL REVASCULARIZATION filed Jul. 31, 1997, now U.S. Pat. No. 5,931,834 which is a continuation-in-part of U.S. Ser. No. 08/729,325 entitled METHOD FOR NON-SYNCHRONOUS LASER-ASSISTED TRANSMYOCARDIAL REVASCULARIZATION, filed Oct. 15, 1996, issued Jul. 28, 1998 as U.S. Pat. No. 5,785,702, both of which are incorporated herein by reference.
A method for transmitting data without carrier wave, using one-cycle electromagnetic or electric impulses. Data is encoded in the transmission by modulating the impulse wavelength and optionally also the impulse position in a transmission interval. Also two different methods for receiving such impulses. The other amplifies the received impulse in multiple reception channels with AC impulses having different modulation states, the most intense amplified impulse is then filtered to find out the correct modulation state of the received impulse. The other measures the time difference between the positive and negative amplitude maximums of the AC equivalent of the received impulse to find out its correct wavelength modulation state. Also a method for organizing wireless communication traffic that uses presented transmission method, where different impulse wavelengths are allocated for different use.
An apparatus and method to apply photo-stimulation, photo-dynamic therapy and/or ablation laser treatment to biological tissue. The apparatus includes a plurality of radiation energy sources, preferably laser beams. Additionally, the apparatus allows either a single wavelength or a combination of various wavelengths, either coincidentally or adjacently, to be utilized to achieve a desired treatment effect. Laser beams are transmitted to the treatment area by one or more fiber optic cables which terminate at an assembly structured to collimate the emitted radiation prior to application to the tissue. In addition, the apparatus includes a focal length setting mechanism which assures that a constant, fixed distance exists between the point of discharge of the laser beam and the biological tissue, thus assuring a constant energy density at the point of application. A method is presented for applying photo-stimulation, photocollagen stimulation and/or ablation laser treatment utilizing the above apparatus.
