Abstract: Injection systems and related methods including an injection device, an operator interface, and modules to determine operational parameters during an MRA imaging procedure. Such parameters may be used to optimize and/or maximize signal intensity during an MRA imaging procedure. The injection system may include a target in-bloodstream contrast agent concentration determination module that determines a target in-bloodstream contrast agent concentration at least partially based on contrast agent type and MRA imager parameters. The injection system may include a contrast agent injection rate determination module that determines a contrast agent injection rate at least partially based on the target in-bloodstream contrast agent concentration, an initial contrast agent concentration, and a cardiac output rate of a patient to be imaged. The injection system may include a diluent injection rate determination module that determines a diluent injection rate at least partially based on the contrast agent injection rate.

Abstract: Injection systems and related methods including an injection device, an operator interface, and modules to determine operational parameters during an MRA imaging procedure. Such parameters may be used to optimize and/or maximize signal intensity during an MRA imaging procedure. The injection system may include a target in-bloodstream contrast agent concentration determination module that determines a target in-bloodstream contrast agent concentration at least partially based on contrast agent type and MRA imager parameters. The injection system may include a contrast agent injection rate determination module that determines a contrast agent injection rate at least partially based on the target in-bloodstream contrast agent concentration, an initial contrast agent concentration, and a cardiac output rate of a patient to be imaged. The injection system may include a diluent injection rate determination module that determines a diluent injection rate at least partially based on the contrast agent injection rate.

Abstract: A microkeratome blade assembly 20 includes a cutting blade 22 having a forward cutting edge 24. A blade holder 26 is attached to the blade 22. At least one indentation 30 is formed in a front surface 29 of the blade holder 26 for reducing shear force between the blade holder 26 and a microkeratome cutting head 38.

Abstract: An adjustable fluid flow resistor 10 for use in ophthalmic surgery includes a housing 12, a first set of dividers 24, and a second set of dividers 28, contained without the housing 12. Fluid flow resistance is adjustable between a minimum when the apertures 26 and 30 of the first and second set of dividers 24 and 28 are aligned. The flow resistance increases as the apertures 26 of the first set of dividers 24 are positioned further away from the apertures 30 of the second set of dividers 28.

Abstract: A foot controller 32 for use with ophthalmic surgical equipment 34 includes a foot controller 32 having a door 18. Door 18 covers a surgical switch 24 when door 18 is in a closed position, and door 18 is a shroud for a surgical switch 24 when door 18 is in an open position. A door-position sensor 48 disables activation of the surgical switch 24, except when the door is in an open position.

Abstract: A collection reservoir 54 includes a rigid-walled cassette adapted for connection to aspiration tubing 50. The cassette also includes a pair of electrodes 36 positioned so that the electrodes are electrically connectable to a flow meter 34. In operation, the electrodes are exposed to the fluid and tissue being aspirated from the surgical site so that the flow meter indicates a flow rate of the fluid and tissue from the surgical site.

Abstract: An ophthalmic surgical pump system 32 includes a collection reservoir 54 and a venturi pump 56 for creating a vacuum level for aspirating fluid and tissue from a surgical site to the collection reservoir 54. Aspiration tubing 50 connects to each of a surgical handpiece 46 and the collection reservoir 54. A flow meter 34 is electrically connected to either the aspiration tube 50 or the collection reservoir 54. Control circuitry 38 is connected to the flow meter 34 and to the venturi pump 56 for varying a vacuum level of the pump 56 to maintain a desired flow rate of the fluid and tissue being aspirated from the surgical site.

Abstract: A foot controller 32 for use with ophthalmic surgical equipment 34 includes a foot controller 32 having a door 18. Door 18 covers a surgical switch 24 when door 18 is in a closed position, and door 18 is a shroud for a surgical switch 24 when door 18 is in an open position. A door-position sensor 48 disables activation of the surgical switch 24, except when the door is in an open position.

Abstract: A collection reservoir 54 includes a rigid-walled cassette adapted for connection to aspiration tubing 50. The cassette also includes a pair of electrodes 36 positioned so that the electrodes are electrically connectable to a flow meter 34. In operation, the electrodes are exposed to the fluid and tissue being aspirated from the surgical site so that the flow meter indicates a flow rate of the fluid and tissue from the surgical site.

Abstract: Surgical tubing 62 for carrying fluids to or from a surgical site. Tubing 62 also includes a pair of electrodes 64 positioned within the tubing. In operation, the electrodes are exposed to the fluids being carried to or from the surgical site so that the electrodes are electrically connectable to a flow meter 34 for indicating a flow rate of the fluids through the tubing.

Abstract: An ophthalmic surgical pump system 32 includes a collection reservoir 54 and a venturi pump 56 for creating a vacuum level for aspirating fluid and tissue from a surgical site to the collection reservoir 54. Aspiration tubing 50 connects to each of a surgical handpiece 46 and the collection reservoir 54. A flow meter 34 is electrically connected to either the aspiration tube 50 or the collection reservoir 54. Control circuitry 38 is connected to the flow meter 34 and to the venturi pump 56 for varying a vacuum level of the pump 56 to maintain a desired flow rate of the fluid and tissue being aspirated from the surgical site.

Abstract: An ophthalmic irrigation/aspiration venting system that vents a portion of an aspiration circuit by drawing sterile air from a bag. The bag is provided with an air reservoir member to ensure that an adequate air volume is available.

Abstract: An ophthalmic illumination system is provided that emits a light that is controllably variable in color. Because the light originates from LEDs, less heat is generated from the emitted light as compared to conventional ophthalmic illumination systems using tungsten or discharge sources.

Abstract: An ophthalmic irrigation/aspiration system that permits selection among or between various venting modes.

Abstract: A method for testing multifocal intraocular lenses and intraocular lenses having designed-in optical aberrations. The method includes the providing of a nullifying lens having an optical zone configured such that light passing through the optical zone and through the intraocular lens is focused at a single plane if the intraocular lens does not contain any fabrication flaws. The invention further includes a nullifying lens constructed such that light passing through the nullifying lens and through an intraocular lens is focused at a single plane if the intraocular lens does not contain any fabrication flaws.