<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区
          您現在的位置: > Language Tips > Audio & Video > Normal Speed News  
           





           
          Engineers and doctors develop heart pump for babies
          [ 2006-10-10 10:26 ]

          A $4.5 million grant from the U.S. government-sponsored National Heart, Lung and Blood Institute is helping to make medical history. The funds are supporting a collaborative effort by scientists, doctors and engineers from five research institutions across the United States to develop a new medical device that will help save babies' lives.

          Baby Isabella was born five days ago. She has a condition called pulmonary hypertension or high pressure in the lungs, which causes the heart to fail.

          Rushed by helicopter to Children's Hospital in Pittsburgh, Pennsylvania, she was hooked up to a heart/lung machine, the same machine routinely used by adults during heart bypass surgery. Pediatric surgeon Peter Wearden says it is a short-term fix for Isabella. "It is a very large machine. It requires the children to be completely relaxed with medicines, to be on a ventilator. Their families can't hold them. And really, it will only work for about two weeks before they can develop serious complications that ultimately can be fatal."

          For Isabella, two weeks is enough time for her heart to rest. But many babies waiting for heart transplants need more time. One quarter of the 4,000 babies waiting die before a new heart becomes available.

          James Antaki wants to change that. He is associate professor of biomedical engineering at Carnegie Mellon University in Pittsburgh where he heads a team working on an infant heart pump.

          "It assists part of the heart while the heart is recovering or is too weak to provide the pressure and flow to keep the baby alive and in some cases it is used as a bridge to a transplant. You can think of it as a crutch," Antaki says.

          But in this case the crutch can last, not two weeks, but six months. Antaki says the artificial device must mimic the baby heart.

          "The heart itself is a pump. It provides pressure and flow of blood to all the vital organs of the body and when the heart takes a break there is really no substitute." 
           
          "So our device is a booster pump inserted into the circulation," Antaki says, "and provides a extra flow or pressure to keep the baby alive and unload the weak heart to give it a chance to take a break."

          Holding a prototype of the pump in his hand, Antaki explains that the walnut-sized device uses so-called turbo-dynamic technology to delicately circulate the baby's blood with a tiny turbine: "In our case,[prototype] is supported by a magnetic bearing or magnetic levitation. A rotor will spin indefinitely because there is no friction and nothing to wear out and in the case of a blood pump, it would never damage the blood cells."

          Antaki says the challenge is to get the blood to flow at exactly the proper rate. Pumping too fast could harm blood cells. Pumping too slow could make the blood clot. Testing so far has been computer-based with models and simulations, such as the kind engineering graduate student Dorian Arnold is using on virtual patients. "What this work allows us to do is test how the pump is going to perform under a whole set of conditions that are not available to us in the clinic or in animals. In doing so we can develop controllers that guide how the pump operates when it is implanted in a patient."

          James Antaki says these cyber tools allow engineers to design components and predict outcomes before actually building anything. But he adds the prototype is the result of collaboration among engineers and teams of doctors and research scientists. "We are really looking forward to the first baby's life that we save and (to) just feel(ing) good that we made a difference."

          Antaki says the infant heart pump will be tested in a baby lamb in October. He expects the device to be available for a human baby within three years.

           


          (來源:VOA  英語點津姍姍編輯

           

           
           

           

           

           
           

          48小時內最熱門

               

          本頻道最新推薦

               
            Accreditation is important in US higher education
            Two Americans awarded Nobel Medicine Prize
            Dance with my father(通訊員投稿)
            US congress acts to limit internet gambling
            Ban Seen to become next UN secretary-general






          主站蜘蛛池模板: 国产三级精品三级在线区| 少妇人妻av毛片在线看| 理论片午午伦夜理片久久| 国产二级一片内射视频插放 | 无线乱码一二三区免费看| 成人无码无遮挡很H在线播放| 国产福利无码一区二区在线| 美女自卫慰黄网站| 日韩视频免费| 日韩有码中文字幕一区二区| 欧美成人www免费全部网站 | 日韩av在线不卡免费| 99久久激情国产精品| 日日碰狠狠添天天爽超碰97久久| 日韩中文字幕人妻精品| 天干夜天干天天天爽视频| 国产午夜三级一区二区三| 久久综合五月丁香久久激情| 激情内射亚洲一区二区三区| 国产一区二区精品尤物| 久久精品亚洲精品国产色婷| 成人特黄特色毛片免费看| 亚洲乱码日产精品一二三| 2020国产成人精品视频| 免费国产高清在线精品一区| 屁股中文字幕一二三四区人妻| 日韩中文字幕免费在线观看| 成午夜福利人试看120秒| 久久人人爽人人人人片av| 国产日韩一区二区在线| 国产成人精品自在钱拍| 亚洲夂夂婷婷色拍ww47| 国产毛片子一区二区三区| 久久综合97丁香色香蕉| 亚洲熟少妇一区二区三区| 国内视频偷拍久久伊人网| 夜夜摸日日摸视频| 一区二区三区四区激情视频| 无码成人AV在线一区二区| 亚洲av综合色区在线观看| 中文字幕av无码免费一区|