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    • 2. 发明授权
    • Flow visualization needle system
    • 流动可视化针系统
    • US5439449A
    • 1995-08-08
    • US231276
    • 1994-04-22
    • Harold C. MapesWilliam M. ApplingMichael P. CodyEamonn P. Hobbs
    • Harold C. MapesWilliam M. ApplingMichael P. CodyEamonn P. Hobbs
    • A61M25/06A61M5/00
    • A61M25/0693
    • A needle system which upon arterial entry provides a visual indication of pulsatile blood flow. The needle system includes an elongated needle with distal and proximal ends. There is a needle hub at the proximal end of the needle and a port position between the proximal needle end and proximal hub end. The visualization connector tube having two ends is provided. The tube is sufficiently clear to permit visualization of material held therein. The first end of the tube is in communication with the port. An elastomeric reservoir is provided. The reservoir is in free, direct, unrestricted two-way communication with a second tube end. The needle, needle hub, and tube all have predetermined volumes. The reservoir has an initial unexpanded state with a first pressure and a first volume and a second state expanded with a second pressure and a second volume. Air pressure in the needle system is increased upon arterial entry. The increase in air pressure compresses and displaces the air in the needle system allowing blood to migrate into a portion of the connector. This air compression and displacement results in a decrease of the volume of air in the system while the volume in the reservoir increases.
    • 在动脉进入时的针系统提供脉动血流的视觉指示。 针系统包括具有远端和近端的细长针。 在针的近端处有针座,并且在近端针端和近端毂端之间的端口位置。 提供具有两端的可视化连接管。 管足够透明以允许保持在其中的材料的可视化。 管的第一端与端口连通。 提供一个弹性储存器。 水库与第二管端自由,直接,无限制的双向通信。 针,针头和管都具有预定的体积。 储存器具有初始未膨胀状态,其具有第一压力和第一容积,第二状态以第二压力和第二容积膨胀。 动脉进入时,针系统中的空气压力增加。 空气压力的增加压缩并移动针系统中的空气,从而允许血液迁移到连接器的一部分中。 这种空气压缩和排量导致系统中的空气体积的减小,同时储存器中的体积增加。