When I went for my follow-up to get my stitches out after my PD cath placement I remember my dr saying that the caths were made so that in the event that we (PT's) were in car accidents or "accidentally" pulled to hard on our caths there is no way that it would come out unless we really and she said "REALLY" pulled hard would it come out, so I really do not think you have anything to worry about.......