摘要:
Bicomposite intraocular lenses having an anterior surface material different from a posterior surface material are disclosed. The posterior surface material reduces the risk of posterior capsule opacification.
摘要:
A thermoplastic polyurethane having inherent softness properties is formed from a diisocyanate, a polyetherglycol and a mixture of diol chain extenders. The mixture of chain extenders includes a first diol and a second diol which has side chain branching. A method for making the polyurethane of the present invention includes mixing the components to induce an exothermic reaction, followed by curing. The polyurethane formed is suitable for melt processing into medical devices such as catheters, other tubing, hubs and the like.
摘要:
A melt extruded catheter of thermoplastic elastomeric hydrophilic polyurethane synthesized from a diisocyanate, polyethyleneoxide glycol of high molecular weight and a chain extender expands to a larger lumen size when contacted with an aqueous liquid. The catheter may include an antithrombogenic agent, antiinfective agent and radiopaque agent. The hydrophilic polyurethane may be synthesized by one-shot bulk polymerization, and may be melt extruded into the catheter tubing, and may encapsulate a stripe of a stiffening polyurethane.
摘要:
A method for preparing stable even coatings of a silicone lubricant on a low surface energy polymeric surface of an article includes plasma treatment of the surface in an atmosphere of a siloxane monomer. A layer of polysiloxane is deposited on the low energy surface to give a polysiloxane surface. A film of a polysiloxane lubricant having a surface tension substantially the same as or less than the surface energy of the polysiloxane surface is applied to the polysiloxane layer.
摘要:
Partition membranes which are permeable to blood electrolytes fabricated from crosslinked polyetherurethane compositions having from 20 to 50% hard segments. The membranes absorb from 50 to 120% of their dry weight of water and have electrolyte diffusion constants of up to 1.times.10.sup.-6 cm.sup.2 /sec. The membranes are included in electrochemical, fiber optic and solid state blood electrolyte sensors to provide blood compatible surfaces and to ensure that blood components deleterious to analysis of electrolyte in the blood remain separated from the sensing elements.
摘要:
An ophthalmic lens system comprises a lens body with a curved outer surface and an assembly including a plurality of spaced apart nanostructures. The assembly covers at least a portion of the curved outer surface.
摘要:
An intraocular lens (IOL) delivery device is disclosed. The device includes an intraocular lens cartridge having an internal coating wherein the coating includes a polymeric material that is compatible with a polymeric material of a material that forms the cartridge. Preferably, the polymeric material of the coating, the cartridge or both is a polyurethane material.
摘要:
In one aspect, the present invention provides an ophthalmic lens (e.g., an IOL) that includes an optic having an anterior surface and a posterior surface disposed about an optical axis. At least one of the surfaces (e.g., the anterior surface) has a profile characterized by superposition of a base profile and an auxiliary profile. The auxiliary profile can include an inner region, an outer region and a transition region between the inner and the outer regions, where an optical path difference across the transition region (i.e., the optical path difference between the inner and the outer radial boundaries of the transition region) corresponds to a non-integer fraction (e.g., ½) of a design wavelength (e.g., a wavelength of about 550 nm).
摘要:
The present invention is generally directed to accommodative intraocular lenses (IOLs) that exhibit a dynamic spherical aberration as a function of accommodative power. By way of example, in one aspect, the present invention provides an intraocular lens (IOL) having an anterior optical element, a posterior optical element, and a mechanism for coupling the anterior and posterior elements so as to allow axial movement of those elements relative to one another for providing accommodation when the lens is implanted in a patient's eye. Each of the anterior and the posterior elements includes at least one aspherical surface, where the asphericities of the surfaces are adapted to provide a combined spherical aberration that varies with accommodation.
摘要:
In one aspect, the present invention provides a method of designing an intraocular lens (IOL) to address variations of at least one ocular parameter in a population of patient eyes. The method can include establishing at least one eye model in which the ocular parameter can be varied over a range exhibited by the population. The eye model can be employed to evaluate a plurality of IOL designs in correcting visual acuity for eyes in the patient population. An IOL design that provides a best fit for visual performance over at least a portion of the parameter range can then be selected.