Implantable medical devices fabricated from polymer blends with star-block copolymers
First Claim
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1. An implantable medical device fabricated from a polymer blend comprising:
- a biodegradable matrix polymer blended with biodegradable star-block copolymers having at least three arms, wherein the arms include inner segments and outer segments, the inner segments forming a discrete phase within a continuous phase, wherein the blend comprises discrete phase regions dispersed within the continuous phase, the continuous phase including the matrix polymer and the outer segments,wherein the inner segments are elastomeric with a glass transition temperature below body temperature, the discrete phase having a lower modulus than the matrix polymer of the continuous phase,wherein the matrix polymer is glassy with a glass transition temperature above body temperature,wherein the discrete phase increases the toughness of the blend,wherein the inner segments comprise units having acidic degradation products that enhance the degradation rate of the blend,wherein the implantable medical device is a stent scaffolding including a network of interconnecting struts and the scaffolding is made completely out of the blend.
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Abstract
Implantable medical devices are fabricated from polymer blends with star-block copolymers. The polymer blends include a biodegradable matrix polymer blended with a biodegradable star-block copolymer. The copolymer has at least three arms and the arms include inner segments and outer segments. The inner segments form a discrete phase within a continuous phase, the continuous phase including the matrix polymer and the outer segments. The segments can include units having acidic degradation products that enhance the degradation rate of the blend.
334 Citations
11 Claims
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1. An implantable medical device fabricated from a polymer blend comprising:
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a biodegradable matrix polymer blended with biodegradable star-block copolymers having at least three arms, wherein the arms include inner segments and outer segments, the inner segments forming a discrete phase within a continuous phase, wherein the blend comprises discrete phase regions dispersed within the continuous phase, the continuous phase including the matrix polymer and the outer segments, wherein the inner segments are elastomeric with a glass transition temperature below body temperature, the discrete phase having a lower modulus than the matrix polymer of the continuous phase, wherein the matrix polymer is glassy with a glass transition temperature above body temperature, wherein the discrete phase increases the toughness of the blend, wherein the inner segments comprise units having acidic degradation products that enhance the degradation rate of the blend, wherein the implantable medical device is a stent scaffolding including a network of interconnecting struts and the scaffolding is made completely out of the blend. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Current AssigneeAbbott Cardiovascular Systems Incorporated (Abbott Laboratories Incorporated)
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Original AssigneeAbbott Cardiovascular Systems Incorporated (Abbott Laboratories Incorporated)
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InventorsWang, Yunbing, Gale, David C., Huang, Bin
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Primary Examiner(s)Matthews, William
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Assistant Examiner(s)Ganesan, Suba
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Application NumberUS11/784,925Publication NumberTime in Patent Office1,982 DaysField of Search623/1.38, 623/1.15, 623/1.42, 623/23.7, 623/1.11, 623/1.16, 623 144- 146, 623/1.49, 623/23.75, 606/194US Class Current623/1.38CPC Class CodesA61F 2/91 made from perforated sheet ...A61F 2210/0004 bioabsorbableA61L 27/48 with macromolecular fillersA61L 27/58 Materials at least partiall...A61L 31/041 Mixtures of macromolecular ...A61L 31/148 Materials at least partiall...
