| 摘要 |
The variable distention angioplasty balloon assembly, for insertion into a blood vessel, comprises an inner elongated, inflatable balloon having a distal portion, a proximal portion and an intermediate portion therebetween and defining therein a first chamber. The inner balloon has a first Young's modulus. The outer elongated, inflatable balloon has a distal portion, a proximal portion and an intermediate portion therebetween positioned around the inner balloon and defines between the balloons a second chamber. The outer balloon has a second Young's modulus. The inner balloon is substantially enclosed by the outer balloon, and the first Young's modulus of the inner balloon is less than the second Young's modulus of the outer balloon. The first chamber of the inner balloon and the second chamber of the outer balloon define a variable dilation structure for dilating an anatomical stricture. The dilation structure with variable characteristics has a first diameter and pressure characteristic curve defined by a first rate of radial expansion dependent on the Young's modulus of the inner balloon and a second diameter and pressure characteristic curve defined a second rate of radial expansion dependent upon the combined Young's modulus of the inner balloon and the outer balloon.
|
