Abstract:
The present invention provides hydrogel coated, implantable medical devices and methods of coating hydrogels onto implantable medical devices. In one embodiment, a hydrogel coated medical device is formed by physically treating a surface of the medical device, chemically treating the surface, applying a hydrogel precursor and then crosslinking the hydrogel precursor to form a hydrogel coating on the surface of the medical device. The present invention may be particularly applicable for coating articulating surfaces on implantable medical devices such as artificial joints.
Abstract:
This invention provides methods and processes to attach or bond hydrogels to suitable surfaces using irradiation techniques and also provides methods and processes to create crosslinked regions in hydrogel articles using these irradiation techniques. Specifically, lasers at wavelengths tuned to the irradiation absorption bands of hydroxyl groups, carboxylic acid groups or water may be used to attach or bond hydrogels to surfaces such as soft tissue and hydrogel surfaces or to crosslink regions in hydrogel articles.
Abstract:
A prosthetic dental device has an inner portion formed of an inner material and an outer portion formed of an outer material that covers at least a part of the inner portion. The inner material is substantially different from the color of natural teeth while the outer material is substantially the same color as natural teeth. Both the inner material and the outer material comprise a polymer.
Abstract:
The present invention provides a method for producing a xanthophyll from a photosynthetic microalga, which includes inoculating a photosynthetic microalga containing a xanthophyll, preferably an encysted microalga, into a nutrient medium to grow the microalga; and encysting the grown microalga, by a single-step culture method in which the growth step and the encystment step are performed continuously using a nutrient medium having a low nitrogen source concentration, or by a two-step culture method in which the microalga is grown in a nutrient medium having a high nitrogen source concentration and then transferred to an encystment medium.
Abstract:
An apparatus, system, and method are disclosed for selective, end-to-end message level security. The apparatus includes a message class definition module, a security module, and a messaging module. The message class definition module identifies a predetermined message class of an internode message. The security module applies security to the message at an application layer. The security that is applied to the message corresponds to a security level, which depends on the message class of the message. The security may include encryption, authentication, and/or other security features. The messaging module communicates the message between a first node and a second node. A third node, such as a broker, may be interposed between the first and second nodes, in which case the security of the message is preserved at the third node.
Abstract:
A method for forming a dual damascene interconnect in a dielectric layer is provided. Generally, a first aperture is etched in the dielectric. A poison barrier layer is formed over part of the dielectric, which prevents resist poisoning. A patterned mask is formed over the poison barrier layer. A second aperture is etched into the dielectric layer, wherein at least part of the first aperture shares the same area as at least part of the second aperture.
Abstract:
Protective caps are formed over horizontally closely spaced apart metal lines of an integrated circuit structure. Low k silicon oxide dielectric material is then deposited over and between the metal lines and over protective caps on the lines. After the formation of such low k material between the lines and over the caps, standard k dielectric material is deposited over the low k layer as a planarizing layer over low portions of the low k layer between the lines which may be lower than the top of the caps on the lines to prevent further etching or dishing of the low k layer of during planarizing. The structure is then planarized to bring the low k dielectric material down to the tops of the protective caps on the metal lines. A layer of standard k silicon material is then formed over the planarized low k layer and the caps to allow via formation without passing through the low k layer to avoid via poisoning.
Abstract:
A composite layer of dielectric material is first formed over the integrated circuit structure, comprising a thin barrier layer of dielectric material, a layer of low k dielectric material over the barrier layer, and a thin capping layer of dielectric material over the layer of low k dielectric material. A photoresist mask, formed over the capping layer, is baked in the presence of UV light to cross-link the mask material. The composite layer is then etched through the resist mask using an etchant gas mixture including CO, but not oxygen. Newly exposed surfaces of low k dielectric material are then optionally densified to harden them. The resist mask is then removed using a plasma of a neutral or reducing gas. Exposed surfaces of low k dielectric material are then passivated by a low power oxygen plasma. Preferably, optional densification, mask removal, and passivation are all done in the same vacuum apparatus. The substrate is then solvent cleaned to remove etch residues and then annealed to degasify the low k dielectric material. The substrate is then RF cleaned and a thin layer of PVD titanium is then formed in the same chamber over the surfaces of the openings. CVD titanium nitride is then formed over the titanium in the same vacuum apparatus. The coated openings are then filled with aluminum, tungsten, or copper.
Abstract:
An EMI shielding and environmental sealing gasket for interposition between a first substrate and an oppositely-disposed second substrate. The gasket is formed of a resilient, tubular body having a generally continuous interior and exterior surface defining a wall thickness of the gasket therebetween, and including base, arcuate, and lateral members. The base member extends intermediate a first and a second edge and has an inner and outer for contact with the second substrate. The arcuate member, which has an inner surface spaced apart radially from the inner surface of the base member and an outer surface for contact with the first substrate, extends intermediate a first proximal end disposed radially inwardly of the first edge of the base member, and a second proximal end disposed radially inwardly of the second edge of the base member. A first lateral member extends from the first edge of the base member to the first proximal end of the arcuate member, with a second lateral member extending from the second edge of the base member to the second proximal end of the arcuate member. Each of the lateral members has an outer surface and an inner surface which defines a acute angle with the inner surface of the base member. The gasket so constructed is deflectable under a predetermined compressive force between the first and second substrates into a collasped orientation characterized in that substantially continuous contact is maintained between the outer surface of the base member and the second substrate.
Abstract:
An improved polarization beam splitter formed by a collimator and two similarly shaped, birefringent crystal prisms is provided. The light from the collimator is incident upon the first face of the first birefringent crystal prism which also has second and third faces. The collimated light is incident upon the second face at an angle .phi. with respect to a line normal to the second face so that light polarized perpendicular to a plane of incidence upon the second face is reflected toward the third face and light polarized in the plane of incidence is refracted at the second face. The second birefringent crystal prism has a second face parallel to, and in close proximity with, the second face of the first birefringent prism so that light refracted at the second face of said first prism is refracted at the second face of the second prism and into the second prism. A first face of the second prism is positioned with respect to its second face so that light refracted into the second prism is refracted at the first face from the second prism cross-sectionally undistorted with respect to a cross-section of the light polarized in the plane of incidence at the second face of the first prism. This polarization beam splitter can handle high power without distorting the beam.