A medical device constraint (106) includes an elastic element having proximal and distal ends, a continuous lumen extending between the proximal and distal ends of the tubular elastic element； and a medical device (104) disposed at least partially within the continuous lumen, wherein the generally tubular element has a first state in which the tubular element is longitudinally held in tension to conceal a gap (112) between the medical device and a distal tip and a second state in which the tubular element is longitudinally relaxed and spaced apart from the gap.
