Method of preparing biodegradable dual pore polymer scaffolds for tissue engineering
    1.
    发明申请
    Method of preparing biodegradable dual pore polymer scaffolds for tissue engineering 有权
    制备用于组织工程的可生物降解双孔聚合物支架的方法

    公开(公告)号:US20070092557A1

    公开(公告)日:2007-04-26

    申请号:US11526280

    申请日:2006-09-21

    IPC分类号: A61K9/70 B29C65/00

    摘要: There is provided a method of preparing biodegradable dual pore polymer scaffolds, comprising the steps of: maintaining a polymer solution containing a biodegradable polymer, an effervescent mixture of carbonate and organic acid, and solvent at a temperature range of −196° C. to ambient temperature so as to evaporate the solvent and produce a polymer sample; and foaming the polymer sample in a mixed solution of water and alcohol. According to the present invention, the pore size of the polymer scaffolds can be easily controlled, and biodegradable polymer scaffolds can be more simply prepared compared to conventional methods such as salt leaching technique, phase separation technique or gas foaming technique. Further, since the biodegradable polymer scaffolds prepared according to the present invention have a high surface area and porosity without formation of skin layer, secretion of toxic substances and remnant phenomenon, they can be advantageously used for regenerating almost all living tissues and organs in tissue engineering.

    摘要翻译: 提供了一种制备可生物降解的双孔聚合物支架的方法,包括以下步骤:将含有可生物降解的聚合物,碳酸盐和有机酸的泡腾混合物和溶剂的聚合物溶液保持在-196℃至环境温度 温度以蒸发溶剂并产生聚合物样品; 并将聚合物样品在水和酒精的混合溶液中发泡。 根据本发明,与常规方法如盐浸技术,相分离技术或气体发泡技术相比,可以容易地控制聚合物支架的孔径,并且可以更简单地制备可生物降解的聚合物支架。 此外,由于根据本发明制备的可生物降解的聚合物支架具有高的表面积和孔隙率,而没有形成皮肤层,有毒物质的分泌和残留现象,因此它们可有利地用于组织工程中几乎所有活组织和器官的再生 。

    Scoop
    2.
    外观设计
    Scoop 有权

    公开(公告)号:USD850222S1

    公开(公告)日:2019-06-04

    申请号:US29630719

    申请日:2017-12-22

    申请人: Dong Han

    设计人: Dong Han

    Circuit Module For Silicon Condenser Microphone
    3.
    发明申请
    Circuit Module For Silicon Condenser Microphone 有权
    硅电容麦克风电路模块

    公开(公告)号:US20160173993A1

    公开(公告)日:2016-06-16

    申请号:US14832535

    申请日:2015-08-21

    IPC分类号: H04R19/04 H04R3/02

    摘要: A circuit module for a silicon condenser microphone of the present disclosure includes a transducer, a charge pump, an isolator, a first amplifier, a second amplifier, a reaction circuit, a first bias circuit, and a second bias circuit. The charge pump electrically connects to an input port of the transducer, and an output port of the transducer electrically connects to an input port of the first amplifier via the isolator. An output port of the first amplifier electrically connects to an input port of the second amplifier. The reaction circuit is arranged between the output port of the first amplifier and the input port of the transducer. The isolator isolates the direct-current components of the first electrical signal, and therefore, the oscillations of the direct-current components will not affect the performance of the first amplifier.

    摘要翻译: 本公开的用于硅电容式麦克风的电路模块包括换能器,电荷泵,隔离器,第一放大器,第二放大器,反应电路,第一偏置电路和第二偏置电路。 电荷泵电连接到换能器的输入端口,并且换能器的输出端口通过隔离器电连接到第一放大器的输入端口。 第一放大器的输出端口电连接到第二放大器的输入端口。 反应电路设置在第一放大器的输出端口和换能器的输入端口之间。 隔离器隔离第一电信号的直流分量,因此直流分量的振荡不会影响第一放大器的性能。