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    • 7. 发明申请
    • CENTER_HOLLOWED_TUBULAR_SHAPED BALLOON FOR ANGIOPLASTY PROCEDURES
    • CENTER_HOLLOWED_TUBULAR_SHAPED BALLOON FOR
    • US20070067010A1
    • 2007-03-22
    • US11162784
    • 2005-09-22
    • William WangZhiyong Wang
    • William WangZhiyong Wang
    • A61F2/06
    • A61M25/1002A61M25/104
    • The present invention is directed to a procedure and a special balloon used in balloon angioplasty and stent installation in percutaneous transluminal coronary angioplasty (PTCA), which employs a heart catheter with a balloon at its distal end. After being inflated, the balloon is in doughnut shape with a hole in the center; its length is made to fit the length of the stent to be inflated. During an angioplasty procedure, the balloon is pushed forward into the stenosis and inflated with a device to dilate the blockage. The doughnut_shaped balloon provides a pass way for blood to flow through the coronary artery vessel, which does not cause angina akin to a heart attack resulted from traditional tube_shaped balloons used in the PTCA procedure that completely block blood flow after being fully inflated during balloon angioplasty and stent installation.
    • 本发明涉及用于经皮腔内冠状动脉血管成形术(PTCA)的球囊血管成形术和支架安装中的程序和特殊球囊,其在其远端采用具有气囊的心脏导管。 充气后,气球呈圆环状,中心有孔; 使其长度适合于要充气的支架的长度。 在血管成形术过程中,将气囊向前推入狭窄并用装置膨胀以扩大阻塞。 面团形气球提供血液流过冠状动脉血管的通行方式,其不会引起类似于在PTCA程序中使用的传统管状球囊引起的心脏病发作的心绞痛,其在球囊血管成形术中完全充满后完全阻断血流量, 支架安装。
    • 8. 发明授权
    • Motion analysis based buffer regulation scheme
    • 基于运动分析的缓冲区调节方案
    • US06389072B1
    • 2002-05-14
    • US09220292
    • 1998-12-23
    • Shing-Chi TzouZhiyong WangJanwun Lee
    • Shing-Chi TzouZhiyong WangJanwun Lee
    • H04N712
    • H04N19/17H04N19/124H04N19/139H04N19/152H04N19/162H04N19/172H04N19/176H04N19/196H04N19/197H04N19/503H04N19/61
    • A method and apparatus for processing and encoding video data is presented that allocates available bandwidth, and hence image quality, in dependence upon the relative speed of motion of objects in a sequence of images forming the video data. Fast moving objects are allocated less quality, or precision, than slower moving or stationary objects. In a preferred embodiment of this invention, the quantization step size is dependent upon the magnitude of the motion vector associated with each block in each frame of a video sequence. In a further embodiment of this invention, the quantization step size is also dependent upon the location of each block in each frame, providing more precision to a central area of each frame. To reduce computational complexity, a motion activity map is created to identify areas of higher precision based upon the location and motion associated with each block. To further reduce computational complexity in a preferred embodiment, the sets of parameters for effecting the desired quality levels are predefined, and include, for example, an initial value and bounds for the quantizing factor that is used for encoding independent and predictive frames of the sequence of images. In a further preferred embodiment, the sets of parameters for effecting the desired quality levels are adjustable based upon a user's preferences.
    • 呈现用于处理和编码视频数据的方法和装置,其根据形成视频数据的图像序列中的对象的相对运动速度分配可用带宽,并因此分配图像质量。 与较慢的移动或静止物体相比,快速移动的物体的质量或精度分配较少。 在本发明的优选实施例中,量化步长取决于与视频序列的每个帧中的每个块相关联的运动向量的大小。 在本发明的另一实施例中,量化步长也取决于每个帧中的每个块的位置,为每个帧的中心区域提供更多的精度。 为了降低计算复杂度,创建运动活动图,以基于与每个块相关联的位置和运动来识别更高精度的区域。 为了进一步降低优选实施例中的计算复杂度,用于实现期望质量水平的参数集是预定义的,并且包括例如用于编码序列的独立和预测帧的量化因子的初始值和界限 的图像。 在另一优选实施例中,用于实现期望质量水平的参数组可基于用户的偏好进行调整。