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Diameter expansion cannula

  • US 5,158,545 A
  • Filed: 05/02/1991
  • Issued: 10/27/1992
  • Est. Priority Date: 05/02/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for expanding the diameter of a blood vessel of a patient comprising:

  • a cannula for passing fluid into and out of a blood vessel of a patient, said cannula having a proximal end and a distal end defining a predetermined length and diameter, formed of a braided construction which allows the length of said cannula to become longer and the diameter of said cannula to become narrower when tension is applied along the longitudinal axis of said cannula;

    means disposed adjacent said distal end of said cannula for puncturing the blood vessel of a patient to permit insertion of said cannula into said blood vessel;

    a removable sheath disposed over said cannula when tension is applied thereto such that the length of said cannula is longer and the diameter is narrower, whereby said sheath maintains the tensioned length and diameter of said cannula during insertion into the patient, whereby said cannula body is allowed to return to its predetermined length and diameter upon removal of said sheath from said cannula.

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