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    • 6. 发明授权
    • Biodegradable vehicle and filler
    • 生物降解车辆和填料
    • US06432438B1
    • 2002-08-13
    • US09605661
    • 2000-06-28
    • Atul J. Shukla
    • Atul J. Shukla
    • A61F1300
    • A61K31/00A61K9/0024A61K47/14A61K47/32A61K47/34C08K5/11C08L67/04
    • A biodegradable vehicle and filler (referred to in this invention as biodegradable vehicle), which can be mixed with one or more biologically active substances (BAS), or can be used as a biodegradable filler to fill in cavities or body tissues in animals, birds and humans. The consistency and rheology, hydrophilicity and hydrophobicity, and in vivo degradation rates of the biodegradable vehicle is controlled by modulating the molecular weight of polymers and copolymers, concentration of plasticizers, ratios of two or more plasticizer in the blends, types of polymers and copolymers, copolymer ratios, and ratios of blends of polymers with different molecular weights or different copolymers. The biodegradable vehicle is mixed with one or more BAS (which is separately stored away from the biodegradable vehicle in an appropriate container) just prior to use. Mixing of the BAS with the biodegradable vehicle can be accomplished by simply stirring the mixture with a stirring device, or by triturating the mixture or employing an ointment mill or a suitable device or apparatus or equipment that can be used for blending/mixing. Alternatively, a device, which resembles two syringes, attached together with a removable partition or a valve assembly can also be used to uniformly mix the BAS with the biodegradable vehicle. The mixing is performed in order to dissolve or uniformly suspend the BAS particles in the biodegradable vehicle. Modulating the polymer to plasticizer ratio, polymer molecular weight, copolymer ratio, and hydrophobicity and hydrophilicity of the plasticizer controls the release of the BAS from the biodegradable vehicle.
    • 可生物降解的载体和填料(在本发明中称为可生物降解载体),其可与一种或多种生物活性物质(BAS)混合,或可用作可生物降解的填料以填充动物,鸟类的空腔或身体组织 和人类。 通过调节聚合物和共聚物的分子量,增塑剂的浓度,共混物中的两种或更多种增塑剂的比例,聚合物和共聚物的类型,可控制可生物降解载体的稠度和流变性,亲水性和疏水性以及体内降解速率, 共聚物比例以及具有不同分子量或不同共聚物的聚合物的共混物的比例。 可生物降解的车辆在使用之前与一个或多个BAS(在适当的容器中分开存储在可生物降解的车辆上)混合。 BAS与生物可降解载体的混合可以通过简单地用搅拌装置搅拌混合物,或通过研磨混合物或使用可用于混合/混合的软膏磨或合适的装置或设备来实现。 或者,也可以使用类似于两个注射器的装置,其与可拆卸的隔板或阀组件连接在一起,以将BAS与可生物降解的车辆均匀混合。 进行混合以便将BAS颗粒溶解或均匀地悬浮在可生物降解的载体中。 调节聚合物与增塑剂的比例,聚合物分子量,共聚物比例以及增塑剂的疏水性和亲水性控制了BAS从生物降解性载体的释放。
    • 7. 发明授权
    • Biodegradable delivery systems of biologically active substances
    • 生物活性物质的生物可降解递送系统
    • US06193991B1
    • 2001-02-27
    • US09181515
    • 1998-10-28
    • Atul J. Shukla
    • Atul J. Shukla
    • A61F200
    • A61K31/00A61K9/0024A61K47/14A61K47/32A61K47/34C08K5/11C08L67/04
    • Biodegradable delivery systems of physiologically, pharmacologically and biologically active substance(s) (BAS) are provided. These systems are obtained by incorporating the BAS into a blend of biodegradable polymers and plasticizers using a novel solvent evaporation method. This method involves dissolving the biodegradable polymer or copolymer and a plasticizer into a volatile solvent. The BAS may then be added to this mixture. The volatile solvent is removed using vacuum or at an elevated temperature or using a combination of both vacuum and elevated temperature. The resultant mixture is a BAS-loaded formulation which when injected, implanted or applied in vivo in an animal or human, provides controlled release of the BAS over the desired period of time. Alternatively, a blank formulation may be first prepared by the aforementioned methodology without incorporating the BAS in the formulation. An appropriate quantity of BAS is then added to this formulation to yield a BAS-loaded formulation which may control the release of the BAS for the desired length of time.
    • 提供了生理,药理和生物活性物质(BAS)的生物可降解递送系统。 这些系统通过使用新型溶剂蒸发法将BAS并入可生物降解聚合物和增塑剂的混合物中而获得。 该方法包括将可生物降解的聚合物或共聚物和增塑剂溶解在挥发性溶剂中。 然后可以将BAS加入到该混合物中。 使用真空或在升高的温度或使用真空和升高的温度的组合除去挥发性溶剂。 所得混合物是BAS-加载的制剂,其在动物或人体内注射,植入或施用时,在所需时间段内提供BAS的受控释放。 或者,可以首先通过上述方法制备空白制剂,而不在制剂中并入BAS。 然后将适量的BAS加到该配方中以产生BAS加载的配方,其可以控制BAS在所需时间长度上的释放。