In an embodiment, an implantable medical device such as a filter includes a plurality of struts 22 arranged in a generally conical form with each strut 22 having a first end, a second end, and an operative length between the first and second ends. Each strut 22 is able to flex along its operative length 32 and includes a strut skeleton (34) having a first flexural modulus and a reinforcement element (36) extending along the operative length 32 and attached to the strut skeleton. The reinforcement element (36) and the strut skeleton (34) together have a second flexural modulus greater than the first flexural modulus. At least one of the reinforcement element (36) and the strut skeleton (34) varies in at least one of amount and composition continuously along the operative length 32 such that the second flexural modulus varies in a continuous manner along the operative length 32. The reinforcement element is biodegradable thereby changing the flexural modulus of the strut from the second flexural modulus to the first flexural modulus as the reinforcement element biodegrades.
