超声探头穿刺盲区

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                    <p style="text-indent: 2em; line-height: 2em;">普通探头安装穿刺架后，穿刺针在探头接触面下方扫描平面之间，有1～2cm穿刺针体在显示器上呈无反射的扫描盲区，致使穿刺针进入皮肤后，有一段在显示器上无法显示的穿刺针长度。</p><p style="text-indent: 2em; line-height: 2em;">不同类型的探头，其扫描盲区宽度不同。扫描盲区愈宽，穿刺角度愈小，则穿刺针的无反射长度愈长，增加穿刺的盲目性，易导致远离穿刺目标，降低穿刺准确性。反之扫描盲区愈窄，穿刺角度愈大，则穿刺针的无反射长度愈短，从而接近穿刺目标，提高穿刺的准确性。</p><p style="text-indent: 2em; line-height: 2em;">扫描盲区有时还会造成定位穿刺的困难，故设置穿刺引导线时，必须考虑到扫描盲区的因素，如图13为穿刺盲区与穿刺引导线、穿刺角度以及皮肤表面的相对关系示意。</p><p style="line-height: 21.3333px;"><br  /></p><p style="text-indent: 2em; line-height: 2em;"><img data-s="300,640" data-type="png" src="http://mmbiz.qpic.cn/mmbiz_png/dx3KibwtDhvcE2dNZZsDGo0jwFuF60w0c0jicESfoQyNBKUy6j1DsJedia9PGcSv9ia2LIzFiaJAaY7dtg0RoPtfk5g/0?wx_fmt=png" data-ratio="0.8565310492505354" data-w="467"  /><br  /></p><p style="text-indent: 2em; line-height: 2em;">总之要求安装穿刺架的探头小巧，使得瞄准定位过程简单而准确，扫描盲区小，而且穿刺架易装卸，操作灵便，对临床适用，可调角度的穿刺探头较为理想。 &nbsp;</p><p style="line-height: 21.3333px;"><br  /></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); text-indent: 2em; line-height: 2em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: Arial, Verdana, sans-serif; font-size: 14px; line-height: 24px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(249, 249, 249);">广州市设备维修有限公司</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; text-indent: 2em; line-height: 2em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">地址：广州市天河区银利街银利茶叶博览中心E栋4楼E4030室 &nbsp; &nbsp; &nbsp; 邮编：510507</span></p><p style="max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; text-indent: 2em; 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