Patent ID: 7959595

Claim:
A catheter assembly comprising: a catheter having a distal end and a proximal end; a lumen running longitudinally from said distal end of said catheter to said proximal end of said catheter; and a solid slidable member disposed within said lumen, said slidable member having an elongate center portion, said elongate center portion having a proximal end and a distal end, said slidable member being adapted to slide within said first lumen; an expandable tip attached to said distal end of said elongate center portion of said slidable member, said tip of said slidable member comprising a first leg and a second leg connected together a distal end of said expandable tip, wherein said first leg extends from said distal end of said elongate center portion to a most distal location of said slidable member and said second leg is attached to said most distal location and extends proximally therefrom, said second leg being curved and forming a cutting surface along an outer edge, said outer edge of said cutting surface abutting an inner surface of said catheter forming said lumen in a retracted position, said outer edge being capable of cutting skin, wherein a lateral width of said cutting surface of said expandable tip in an expanded state is wider than a lateral width of said lumen, and wherein said second leg engages said opening of said lumen when said slidable member is retracted within said lumen, thereby compressing said second leg to permit said expandable tip of said slidable member to be withdrawn into said lumen.