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US 7,842,377 B2Granted
Porous polymeric particle comprising polyvinyl alcohol and having interior to surface porosity-gradient
AssigneeBoston Scientific Scimed, Inc.
InventorsJanel Lanphere, Ernest J. St. Pierre, Greg Kapoglis, Thomas V. Casey, II
Life of this patent
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Abstract
A composition includes a plurality of particles. At least some of the plurality of particles include cross-linked polyvinyl alcohol and have a diameter of about 500 microns or less. The particles have a first average pore size in an interior region, and a second average pore size at a surface region. The first average pore size being greater than the second average pore size. The composition also includes a carrier fluid. The plurality of particles being in the carrier fluid.
Claims23
A composition, comprising:
- a plurality of particles, at least some of the plurality of particles comprising cross-linked polyvinyl alcohol and having a diameter of about 500 microns or less, the at least some of the particles having a first average pore size in an interior region and a second average pore size at a surface region, the first average pore size being greater than the second average pore size;
- and
- a carrier fluid, the plurality of particles being in the carrier fluid.
A composition, comprising:
- a plurality of particles, at least some of the plurality of particles comprising polysaccharide and having a diameter of about 500 microns or less, the at least some of the particles having an interior region defining pores and a surface region defining pores, the at least some of the particles having a first density of pores in the interior region and a second density of pores at the surface region, the first density being different from the second density, the at least some of the particles having a first average pore size in the interior region and a second average pore size at the surface region, and the first average pore size being greater than the second average pore size;
- and
- a carrier fluid, the plurality of particles being in the carrier fluid.
Dependencies are inferred from the claim text.