Updated February 24, 2017. The mean or average birth weight in the United States is about 3,389g or 7 lb, 7.5 oz. However, any birth weight of a term newborn between 5 lbs, 8 oz and 8 lbs, 13 oz is considered to be normal. Baby Birth Weight Statistics.
Development of coronary stents. WALLSTENTÂ® (Schneider AG), a self-expanding, stainless steel wire-mesh structure, was the first coronary stent implanted in a human coronary artery by Sigwart et al. in 1986.
A balloon catheter, placed over a guide wire, puts the stent into your narrowed coronary artery. Once in place, the balloon is inflated, and the stent expands to the size of the artery and holds it open. The balloon is then deflated and removed while the stent stays in place. Over several weeks, your artery heals around the stent. These are often placed during angioplasty to help keep the coronary artery open. The stent is usually made of metal and is permanent. It can also be made of a material that the body absorbs over time.