Abstract:
This invention relates to an improved method and apparatus for generating profiled pulses of ultrasonic frequency vibratory energy at a distal surface of an ultrasonic surgical instrument for application to tissues of a patient, including the providing of a profiled pulse signal with a first profile and a maximum magnitude during a first time portion and a second profile and a minimum magnitude during a second time portion, the second time portion being greater than or equal to the duration of the first time portion, the first time portion being between one millisecond and fifty milliseconds in duration, and the maximum magnitude in the range between two and twenty times the minimum magnitude.
Abstract:
Disclosed are an apparatus and a method for generating a constant current pulse wave, a medical operation method using the same, and a light generating apparatus. The apparatus for generating the constant current pulse wave comprises: a charge unit for receiving the current and charging the electric charges; a converter unit for applying the constant voltage to a flash lamp during a first reference time and applying the constant current to the flash lamp during a second reference time using the electric charges charged in the charge unit; and a control unit which is operated in a constant voltage control mode to transmit a constant voltage control signal for controlling an output of the constant voltage of the converter unit during the first reference time to the converter unit and is operated in a constant current control mode to transmit a constant current control signal for controlling an output of the constant current of the converter unit during the second reference time to the converter unit. Accordingly, the stable pulse wave of the constant current can be applied to the flash lamp.
Abstract:
The invention concerns a laser photocoagulator comprising a laser emitting at a wavelength within the ICG absorption spectrum and provided with focusing means and a programmed or controlled module powering the laser such that the mean fluence (F) at the focus starting from an initial time varies according to an increasing function in time not varying at any time by more than 10 % of an increasing monoexponential corresponding to formula F = Fo(1-e ) wherein F is the initial fluence and tau is a time constant ranging between 3 and 5 mn.
Abstract:
A method of non-thermally ablating undesirable tissue in the body by application of pulsed, bipolar, instant charge reversal electrical fields of sufficient energy to cause complete and immediate cell membrane rupture and destruction. Energy is delivered through radio frequency pulses of particular frequencies, wave characteristics, pulse widths and pulse numbers, such that enhanced physical stresses are placed on the cell membrane to cause its immediate and complete destruction thereby spilling the entire cell content and membrane constituents into, the extracellular space without denaturing proteins so as to enable an immunological response to destroy and remove the target tissue and similarly marked tissue elsewhere in the subject.
Abstract:
An IOL injection device comprises a tubular housing with a plunger longitudinally disposed within the tubular housing. The device is configured so that when the plunger is translated towards the front of the device, its tip engages an intraocular lens insertion cartridge mounted at or near the front end of the housing. The IOL injection device further comprises a control circuit. The control circuit is configured to perform the steps of advancing the plunger to a critical point at which an axial compressive force on the lens suddenly increases, retracting the plunger from the critical point to a sufficient distance for material of the intraocular lens to relax, pausing to allow the material of the intraocular lens to relax, advancing the plunger to the critical point a second time, and continuing to advance the plunger beyond the critical point to implant the intraocular lens.
Abstract:
A shock wave catheter system and method produces a shock wave with reduced energy. The system includes a catheter and a power source. The catheter has an elongated carrier and a balloon about the carrier in sealed relation thereto. The balloon is arranged to receive a fluid therein that inflates the balloon. The catheter further includes an arc generator including at least two electrodes within the balloon. The power source is coupled to the at least two electrodes and is configured to grow a bubble at one of the at least two electrodes and then thereafter to rapidly expand the bubble to form a shock wave within the balloon.
Abstract:
Medical apparatus for cauterisation functions with capacitive coupling (19) from a patient (18) back to an electrical power source (11). Energy from the power source is delivered at a frequency in the Kilohertz region and of amplitude less than 5KV to the patient (18) along a conductor (12). Substantially insert gas is delivered to the end of the conductor (12) where a nozzle (13A) is formed from which and ionised plasma emerges for incidence on the patient (18). The gas may include up to 25 % oxygen. The end piece may take the form of a hand tool and be made of material of low permittivity.
Abstract:
The LEDs in a phototherapy LED pad are controlled so that the intensity of the light varies in accordance with a sinusoidal function, thereby eliminating the harmonics that are generated when the LEDs are pulsed digitally, in accordance with a square-wave function. This is accomplished analogically by using a sinusoidal wave to control the gate of a MOSFET connected in series with the LEDs or by using a digiltal-to-analog converter to control the gate of the MOSFET with a stair step function representative of the values of a sinusoidal function at predetermined intervals. Alternatively, pulse-width modulation is used to control the gate of the MOSFET in such a way that the average current through the LEDs simulates a sinusoidal function. In additional to using a simple sine wave function, the LED current may also be controlled in accordance with "chords" containing multiple sine waves of different frequencies.