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    • 7. 发明申请
    • MEDICAL INSTRUMENT AND METHOD OF USE
    • 医用仪器及其使用方法
    • US20120271300A9
    • 2012-10-25
    • US11329381
    • 2006-01-10
    • John ShadduckMichael Hoey
    • John ShadduckMichael Hoey
    • A61B18/18A61F7/12A61F7/00
    • A61B18/042A61B18/04A61B2018/00619A61B2018/0063A61B2018/046A61B2018/048
    • An instrument for thermally-mediated therapies in targeted tissue volumes or for volumetric removal of tissue. In one embodiment, the instrument has an interior chamber that includes a diffuser structure for diffusing a biocompatible conductive fluid that is introduced under high pressure. The interior chamber further includes surfaces of opposing polarity electrodes for vaporizing the small cross-section diffused fluid flows created within a diffuser structure. In one embodiment, the diffuser structure includes a negative temperature coefficient of resistance material between the opposing polarity surfaces. The NTCR structure can self-adjust the lengths of current paths between the opposing polarities to insure complete vaporization of the volume of flow of conductive fluid. The non-ionized vapor phase media is ejected from a working surface of the instrument and a controlled vapor-to-liquid phase change in an interface with tissue applies thermal energy substantially equal to the heat of vaporization to ablate tissue. In another embodiment, the instrument provides voltage means for converting the non-ionized vapor phase media into an ionized media or plasma for applying energy to body structure.
    • 用于靶向组织体积或体积去除组织的热介导疗法的仪器。 在一个实施例中,仪器具有内部腔室,其包括用于扩散在高压下引入的生物相容性导电流体的扩散器结构。 内部腔室还包括相对极性电极的表面,用于蒸发在扩散器结构内产生的小横截面扩散的流体流。 在一个实施例中,扩散器结构包括在相对的极性表面之间的电阻材料的负温度系数。 NTCR结构可以自我调节相对极性之间的电流通路的长度,以确保导电流体流量的完全蒸发。 非离子化的气相介质从仪器的工作表面喷出,并且与组织的界面中受控的蒸气 - 液相变化施加基本上等于蒸发热消融组织的热能。 在另一个实施例中,仪器提供电压装置,用于将非电离气相介质转换成离子化介质或等离子体,以将能量施加到体结构。