Patent ID: 7993391

Claim:
An endoprosthesis, comprising: a tubular member having a first layer including a first polymer matrix encapsulating a plurality of fibers in the first polymer matrix, the fibers having a stiffness greater than stiffness of the first polymer matrix and having lengths in the range of about 0.01 to about 10 millimeters, and being oriented in a first predetermined direction, the first polymer matrix being stable in body fluids; and a second layer including a second polymer matrix encapsulating a plurality of fibers in the second polymer matrix, the fibers having a stiffness greater than the stiffness of the second polymer matrix, having lengths in the range of about 0.01 to about 10 millimeters, and being oriented in a second predetermined direction, the second predetermined direction being different than the first predetermined direction, the second polymer matrix being stable in body fluids.