久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

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: 亚洲视频在线观 | 国产三级观看 | 狠狠色综合久久婷婷 | 在线视频日本 | 精品三级国产一区二区三区四区 | 亚洲第一区香蕉_国产a | 欧美成人亚洲国产精品 | 欧美观看一级毛片 | 久草在线资源 | 91av小视频 | 美女喷水网站 | 夜色成人免费观看 | 成人久久18免费网站 | 亚洲网站视频 | 亚洲久草在线 | 99久久精品视香蕉蕉er热资源 | 国产做a爰片久久毛片 | 步兵一区二区三区在线观看 | 国产第一页在线观看 | 久操免费在线视频 | 成人精品视频网站 | theav视频在线观看 | 国产99视频在线 | 神马我我不卡伦影视 | 精品免费久久久久久成人影院 | 美女一级毛片免费观看 | 毛片免费观看成人 | 亚洲欧美国产中文 | 鲁老汉精品视频在线观看 | 亚洲欧美精品一区 | 久久国产精品夜色 | 亚洲国产日韩欧美一区二区三区 | 欧美成成人免费 | 在线国产一区二区 | 国产在线观看精品 | 国产免费影院 | 成人免费视频日本 | 国产精品亚洲精品日韩已方 | 欧美日韩亚洲v在线观看 | 在线成人天天鲁夜啪视频 | 亚洲天堂免费看 |