Wound implant materials
First Claim
1. A reticulated wound implant material comprising a plurality of bioabsorable microspheres bound together by a bioabsorable matrix which extends between adjacent microspheres, the wound implant having open pores formed by and between adjacent microspheres and the matrix material, the approximate size and volume fraction of the microspheres in the implant material being preselected to provide an approximate size of the pores of between 50 mm and 250 mm whereby to enhance tissue ingrowth into the wound implant material, and wherein at least one of the microspheres and the matrix contains a medicament selected from the group consisting of:
- fibronectin, a cytokine, a growth factor, an antiseptic, an antibiotic, steroid and an analgesic; and
wherein the microspheres are formed of a first bioadsorable biopolymer and the matrix is formed of a second bioabsorable bipolymer, wherein the first bioabsorable biopolymer and the second bioabsorable biopolymer are the same or different and wherein each of the first and second bioabsorable biopolymers are selected from the group consisting of;
a polymer or copolymer of lactic acid and/or glycolic acid, collagen, cross-linked collagen, hyaluronic acid, cross-linked hyaluronic acid, an alaginate and a cellulose derivative.
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Accused Products
Abstract
Wound implant materials are described comprising a plurality of bioabsorbable microspheres bound together by a bioabsorbable matrix, such as in a freeze-dried collagen matrix. The microspheres preferably comprise over 30% of the volume of the material, and preferably have diameters of 10 μm to 1500 μm. The microspheres and/or the matrix preferably comprise a polylactic/polyglycolic copolymer, collagen, cross-linked collagen, hyaluronic acid, cross-linked hyaluronic acid, an alginate or a cellulose derivative. The resulting implants are stronger and more slowly resorbed than conventional collagen sponge implants. Better control over the porosity of the implant is achieved.
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Citations
21 Claims
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1. A reticulated wound implant material comprising a plurality of bioabsorable microspheres bound together by a bioabsorable matrix which extends between adjacent microspheres, the wound implant having open pores formed by and between adjacent microspheres and the matrix material, the approximate size and volume fraction of the microspheres in the implant material being preselected to provide an approximate size of the pores of between 50 mm and 250 mm whereby to enhance tissue ingrowth into the wound implant material, and wherein at least one of the microspheres and the matrix contains a medicament selected from the group consisting of:
- fibronectin, a cytokine, a growth factor, an antiseptic, an antibiotic, steroid and an analgesic; and
wherein the microspheres are formed of a first bioadsorable biopolymer and the matrix is formed of a second bioabsorable bipolymer, wherein the first bioabsorable biopolymer and the second bioabsorable biopolymer are the same or different and wherein each of the first and second bioabsorable biopolymers are selected from the group consisting of;
a polymer or copolymer of lactic acid and/or glycolic acid, collagen, cross-linked collagen, hyaluronic acid, cross-linked hyaluronic acid, an alaginate and a cellulose derivative. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18, 19, 20, 21)
- fibronectin, a cytokine, a growth factor, an antiseptic, an antibiotic, steroid and an analgesic; and
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12. A process of preparing a reticulated wound implant material, comprising the steps of:
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preparing bioabsorbable microspheres; dispersing the bioabsorbable microspheres in a solution or suspension of a bioabsqrbable material in a solvent; and removing the solvent by evaporation; forming pores by and between the microspheres and matrix, and adjusting the size of the microspheres and their density within the matrix to achieve an average pore size of between 50 mm and 250 mm; wherein the microspheres and/or the bioabsorbable material contain a medicament selected from the group consisting of;
fibronectin, a cytokine, a growth factor, an antiseptic, an antibiotic, a steroid and an analgesic; andwherein the microspheres are formed of a first bioabsorbable biopolymer and the matrix is formed of a second bioabsorbable biopolymer, wherein the first bioabsorbable biopolymer and the second bioabsorbable biopolymer are the same or different and wherein each of the first and second bioabsorbable biopolymers are selected from the group consisting of;
a polymer or copolymer of lactic acid and/or glycolic acid, collagen, cross-linked collagen, hyaluronic acid, cross-linked hyaluronic acid, an alginate and a cellulose derivative. - View Dependent Claims (13)
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Specification