共用题干 第三篇First Self-contained Heart ImplantedA patient on the brink（边缘）of death has received the worl...

共用题干
第三篇
First Self-contained Heart Implanted
A patient on the brink（边缘）of death has received the world's first self-contained artificial heart-a battery-powered device about the size of a softball that runs without the need for wires,tubes sticking out of the chest.
Two surgeons from the University of Louisville implanted the titanium（钛）and plastic pump during a seven-hour operation at Jewish Hospital Monday.The hospital said the patient was"awake and responsive" Tuesday and resting comfortably.It refused to release personal details.
The patient had been expected to die within a month without the operation,and doctors said they expected the artificial heart to extend the person's life by only a month.But the device is considered a major step toward improving the patient's quality of life.
The new pump,called AbioCor,is also a technological leap from the mechanical hearts used in the 1980s,which were attached by wires and tubes to bulky machinery outside the body.The most famous of those mechanical hearts,the Jarvic-7，used air as a pumping device and was attached to an apparatus about the size of a washing machine.
"I think it's potentially a major step forward in the artificial heart development,"said Dr.David
Faxon,president of the American Heart Association.However,he said the dream of an implantable,perma- nent artificial heart is not yet a reality."This is obviously an experimental device whose long-term success has to be demonstrated."
Only about half of the 4,200 Americans on a waiting list for donor hearts received them last year,and most of the rest died.Some doctors,including Robert Higgins,chairman of cardiology at the Medical Col-lege of Virginia in Richmond,said artificial hearts are unlikely to replace donor hearts.
"A donor heart in a good transplant can last 15 to 30 years."he said,"It's going to be hard to replace that with a machine." We can learn from Paragraph 4 that the Jarvic-7 is_____.