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    • 1. 发明申请
    • SYSTEMS AND METHODS FOR DELIVERY OF MATERIALS
    • 用于输送材料的系统和方法
    • WO2009073192A3
    • 2009-10-22
    • PCT/US2008013335
    • 2008-12-03
    • LANDEC CORPTAFT DAVID DBITLER STEVEN PZHENG QIANGTZANNIS STELIOS TBELL ADAM WDAI WEI-GUOOTTENSMANN SANDRA NBALACHANDER NATARAJAN
    • TAFT DAVID DBITLER STEVEN PZHENG QIANGTZANNIS STELIOS TBELL ADAM WDAI WEI-GUOOTTENSMANN SANDRA NBALACHANDER NATARAJAN
    • A61K9/16A61K31/196A61K31/519A61P25/18A61P29/00
    • A61K9/146A61K9/1647A61K31/136A61K31/196A61K31/519A61K31/5513A61K47/34
    • Systems and methods for delivering release materials, for example drugs and other bioactive materials. Crystalline polymeric systems, referred to as CYC carriers, are associated with the release materials, through chemical bonding or through physical association. The crystallinity of the CYC carriers results from the presence of crystallizable side chains, for example long chain n-alkyl moieties, which results in relatively low and sharp melting temperatures. One class of CYC carriers, referred to as CYSC polymers, have a majority of the crystallizable side chains pendant from the polymer backbone. Another class of CYC carriers, referred to as ECC polymers, have a majority of the crystallizable side chains attached to terminal units of the polymer backbone. The ECC polymers can for example be obtained by modification of PLGA polymers. The CYC carriers in another class of non-polymeric. Some CYC carriers, referred to as CYC assemblies, have enhanced crystallinity as a result of the physical association of crystallizable moieties which are present in different types of molecule, for example between a polymer containing crystallizable moieties and a monomer containing crystallizable moieties. For some uses, particularly the delivery of drugs, a bioerodable CYC carrier is preferably used.
    • 用于输送释放材料的系统和方法,例如药物和其他生物活性材料。 称为CYC载体的结晶聚合体系通过化学键合或通过物理缔合与释放材料相关联。 CYC载体的结晶度来自可结晶侧链的存在,例如长链正烷基部分,这导致相对低的和尖锐的熔融温度。 称为CYSC聚合物的一类CYC载体具有从聚合物主链悬挂的大部分可结晶侧链。 称为ECC聚合物的另一类CYC载体具有连接至聚合物主链末端单元的大部分可结晶侧链。 ECC聚合物可以例如通过改性PLGA聚合物获得。 CYC载体在另一类非聚合物中。 一些称为CYC组件的CYC载体由于存在于不同类型分子中的可结晶部分的物理结合而具有增强的结晶度,例如在含可结晶部分的聚合物和含可结晶部分的单体之间。 对于一些用途,特别是药物的递送,优选使用生物侵蚀性CYC载体。
    • 9. 发明专利
    • ORTHOPEDIC CASTS
    • CA2173967A1
    • 1995-05-18
    • CA2173967
    • 1994-11-08
    • LANDEC CORP
    • GREENE LAWRENCE CDAHLEN BURTON LLARSON ANDREW WTAFT DAVID DBITLER STEVEN P
    • A61F13/04A61F5/04A61F5/058A61L15/07
    • Heat-recoverable orthopedic casts include a support which is maintained in an elastically deformed condition by a casting polymer, e.g. a polycaprolactone (PCL) or a side chain crystallizable polymer having a relatively low melting point. The cast is placed around the limb and is then heated. The casting polymer softens and the cast recovers around the limb. A liner is preferably placed between the cast and the limb, especially when the casting polymer is PCL or has a comparable or higher melting point. For high strength casts, the support is preferably an open-mesh knitted fabric which, when fully relaxed, contains at most 300 holes per inch2 (at most 45 holes per cm2). Such a fabric, when it is extensible to a maximum of 15 to 40 %, is also useful as casting tape which comprises a curable polymer casting composition, e.g. a water-curable polyurethane prepolymer. As illustrated in Figures 1 and 2, a stockinette liner (2) is preferably placed between the cast (1) and the limb as a thermal barrier. A reinforcing component may be used to strengthen the recovered cast. Suitable reinforcing components include (A) polyurethane precursors which are applied to the cast before or after recovery, and are polymerized during or after recovery, and (B) thermoplastic materials which are applied hot to the recovered cast. Casts made in this way can be divided to make splints which can be easily removed and replaced.