Abstract: Self-restrained stent for use in a lumen of a vessel of a patient having a body with the vessel therein, comprising a substantially cylindrical member formed of a plastic material having a built-in elastic predetermined diameter and having a memory provided therein of a diameter greater than the predetermined diameter. The plastic is characterized in that it will attempt to assume the greater diameter in its memory upon occurrence of one or more of the following conditions:(a) adsorption of heat by the plastic material;(b) adsorption of a liquid by the plastic material; and(c) a change in the pH in the liquid in which the plastic member is disposed.

Abstract: A stent designed to be carried on the balloon of a balloon catheter to a target site is described. The stent is formed of a series of expandable, strip-like segments, each formed of a memory polymer and adapted for movement between a closed, high-curvature condition and an expanded, low-curvature condition upon exposure to a selected stimulus.

Abstract: An apparatus for dispensing pressurized material is comprised of a container, a polymeric matrix having a network of macropores located within the container, and a propellant that may be reversibly sorbed with the network of macropores so as to desorb as the partial pressure of the propellant within the container decreases. The network of pores is substantially non-swellable upon sorption and desorption of the propellant during filling and use of the dispensing apparatus. The polymeric matrix may comprise aggregates of macroporous polymeric particles in which the particles define a substantially non-collapsible pore network and the aggregates define interstitial spaces between the particles, and the interstitial spaces are substantially larger than the pore network.

Abstract: Self-restrained stent for use in a lumen of a vessel of a patient having a body with the vessel therein, comprising a substantially cylindrical member formed of a plastic material having a built-in elastic predetermined diameter and having a memory provided therein of a diameter greater than the predetermined diameter. The plastic is characterized in that it will attempt to assume the greater diameter in its memory upon occurrence of one or more of the following conditions:(a) adsorption of heat by the plastic material;(b) adsorption of a liquid by the plastic material; and(c) a change in the pH in the liquid in which the plastic member is disposed.

Abstract: An apparatus for dispensing pressurized material is comprised of a container, a polymeric matrix having a network of macropores located within the container, and a propellant that may be reversibly sorbed with the network of macropores so as to desorb as the partial pressure of the propellant within the container decreases. The network of pores is substantially non-swellable upon sorption and desorption of the propellant during filling and use of the dispensing apparatus. The polymeric matrix may comprise aggregates of macroporous polymeric particles in which the particles define a substantially non-collapsible pore network and the aggregates define interstitial spaces between the particles, and the interstitial spaces are substantially larger than the pore network.

Abstract: Self-restrained stent for use in a lumen of a vessel of a patient having a body with the vessel therein, comprising a substantially cylindrical member formed of a plastic material having a built-in elastic predetermined diameter and having a memory provided therein of a diameter greater than the predetermined diameter. The plastic is characterized in that it will attempt to assume the greater diameter in its memory upon occurrence of one or more of the following conditions:(a) adsorption of heat by the plastic material;(b) adsorption of a liquid by the plastic material; and(c) a change in the pH in the liquid in which the plastic member is disposed.

Abstract: Contact lens compositions containing monomers or cross-linking materials which result in satisfactory moisture content but lowered protein absorption capability are described. Lenses are comfortable for extended wear, but because of lowered protein absorption do not become opaque, and present less infection risk. Included are compositions with over 20% conventional cross-linkers, with 20-100% cross-linkers which are unsaturated diesters of the alcohol of the formula HO(CH.sub.2 CH.sub.2 O).sub.n H wherein n is 5-300; or 1-69% copolymerizing monomer which is an ester of an alcohol of similar formula; or 0.1-90% cross-linkers which are diesters of the diol of the formula HOCH.sub.2 (CF.sub.2).sub.m CH.sub.2 OH, or which contain silyl components such as HO(SiR.sub.2 O).sub.x --; or with inclusions of 1-40% polyethylene glycol or polyethylene oxide; or copolymers containing 1-90% polyethylene oxide segments when the composition does not include carboxylic acids and is not treated with alkali.

Abstract: Contact lens compositions containing monomers or cross-linking materials which result in satisfactory moisture content but lowered protein absorption capability are described. Lenses are comfortable for extended wear, but because of lowered protein absorption do not become opaque, and present less infection risk. Included are compositions with over 10% conventional cross-linkers, with 0.1-100% cross-linkers which are unsaturated diesters of the alcohol of the formula HO(CH.sub.2 CH.sub.2 O).sub.n H wherein n is 5-300; or 10-50% copolymerizing monomer which is an ester of an alcohol of similar formula; or 0.1-90% cross-linkers which are diesters of the diol of the formula HOCH.sub.2 (CF.sub.2).sub.m CH.sub.2 OH, and compositions containing more than 10% cross-linker; or with inclusions of 1-40% polyethylene glycol or polyethylene oxide; or copolymers containing 1-60% polyethylene oxide segments.