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Stent delivery system

  • US 9,883,962 B2
  • Filed: 07/10/2014
  • Issued: 02/06/2018
  • Est. Priority Date: 02/23/2012
  • Status: Active Grant
First Claim
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1. A stent delivery system comprising:

  • an inner tube;

    a stent which is compressed toward a center axis and disposed on a distal side of the inner tube during insertion into a lumen of a living body, and which can be restored to a pre-compression shape by expanding outward when put indwelling in the lumen of the living body;

    an outer tube which is disposed on an outer surface side of the inner tube, the outer tube containing the stent, and movable relative to the inner tube and the stent to release the stent by moving proximally relative to the inner tube; and

    an operating unit operable by an operator to move the outer tube in an axial direction relative to the inner tube,wherein the operating unit includesa plurality of rotary bodies configured to be rotated by an operation performed by the operator,a displacement body connected to the outer tube and movable in the axial direction, anda speed change mechanism which is provided between the rotary bodies and the displacement body and changes a speed of the rotation of the rotary bodies, thereby changing a moving speed of the displacement body by transmitting the rotation to the displacement body, andwherein the speed change mechanism includesa plurality of speed change portions which have different respective outer diameters and each of which is rotated together with a respective one of the rotary bodies, said plurality of speed change portions configured to rotate at different respective speeds, anda unitary transmission portion which is provided on the displacement body and which is meshed with or is in sliding contact with all of the speed change portions.

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