Abstract:
PROBLEM TO BE SOLVED: To provide a method for improving the intraocular pressure control in a system for microscopic surgical operation using a flow measured value and two injection chambers.SOLUTION: An injection chamber 16 where a drench fluid enters is provided, and desired intraocular pressure is selected. The injection chamber 16 is pressurized by pressure gas to supply the drench fluid to a surgical operation device 29. The flow quantity of the fluid flowing in a passage fluidly connected to the surgical operation device is measured. A signal corresponding to the measured flow quantity is supplied to a computer 28. According to the signal, an estimated value of the intraocular pressure is calculated by the computer. According to a second signal from the computer, the level of the pressure gas is adjusted to keep the estimated value of the intraocular pressure to the neighborhood of a desired intraocular pressure.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method for attenuating brightness of a light beam while minimizing undesirable effects such as shadow and color rings caused by positional attenuation. SOLUTION: The output brightness of an illuminator is varied by chopping an output light beam such that the beam is alternately shielded and unshielded. A shield is rapidly moved into and out of the transmission path of the light beam. The brightness of the light beam received at a site is attenuated based on the time amount per cycle when the light beam is shielded or unshielded. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method for attenuating brightness of a light beam while minimizing undesirable effect such as shadow and color rings caused by positional attenuation.SOLUTION: Output brightness of a lighting device is varied by chopping an output light beam so that the beam is alternately shielded and unshielded. A light shield device is rapidly moved into and out of a transmission path of the light beam. Brightness of the light beam received at a certain site is attenuated on the basis of a time amount per cycle when the light beam is shielded or when the light beam is unshielded.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved method for controlling intraocular pressure during ophthalmic surgery.SOLUTION: This method for controlling intraocular pressure with a microsurgical system includes steps of: providing an infusion chamber containing an irrigating fluid; selecting an intraocular pressure; pressurizing the infusion chamber with a pressurized gas to provide irrigating fluid to a surgical device; measuring a flow rate of the fluid within a fluid line fluidly coupled to the surgical device; providing a signal corresponding to the measured flow rate to a computer; calculating a predicted value of the intraocular pressure with the computer in response to the signal; and adjusting a level of the pressurized gas in response to a signal from the computer to maintain the predicted value proximate the selected intraocular pressure.
Abstract:
An ophthalmic endoilluminator has a power supply coupled to a light source, a controller, a collimation device, an alignment device, a lens, and an optical fiber. The light source has three light emitting diodes. Each of the three light emitting diodes produces a different color light. The controller controls the operation of the three light emitting diodes. The collimation device collimates the light produced by at least one of the light emitting diodes. The alignment device aligns the light individually produced by the three light emitting diodes into a single light beam. The lens focuses the single light beam. The optical fiber for carries the single light beam.
Abstract:
A flow control device includes a fitting having three portals. Two of the portals are input portals and one of the portals is an exit portal. Located in one of the input portals is a normally closed back flow prevention valve. The normally closed back flow prevention valve prevents back flow of fluid through the fitting when the fluids flowing through the fitting are changed.
Abstract:
An ophthalmic endoilluminator includes a light source, a variable-wedge rotating-disk attenuator, a condensing lens, and an optical fiber. The variable-wedge rotating-disk attenuator attenuates the light produced by the light source. The variable-wedge rotating-disk attenuator includes a wedge capable of being adjusted over a variable angle as measured through an arc of the wedge and an axle to which the wedge is attached. The axle rotates such that the wedge rotates around a pivot defined by the axle. The condensing lens focuses the attenuated light. The optical fiber carries the focused light into an eye. The variable-wedge rotating-disk attenuator is located such that it affects the intensity of a light beam transmitted into an eye.
Abstract:
A microsurgical system capable of controlling aspiration and detecting an occlusion via monitoring a change in either suction flow rate or suction impedance.