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Dual bend radii steering catheter

  • US 9,855,404 B2
  • Filed: 08/27/2013
  • Issued: 01/02/2018
  • Est. Priority Date: 05/03/2013
  • Status: Active Grant
First Claim
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1. A catheter assembly, comprising:

  • a shaft portion having a proximal end and a distal end and including a shaft section sidewall that defines a central lumen;

    a steering portion having a proximal end and a distal end, said proximal end of said steering portion being operatively coupled with said distal end of said shaft portion, said steering portion including a steering section sidewall having a first steering section sidewall lumen and a second steering section sidewall lumen formed therein, wherein the first and second steering section sidewall lumens are continuous lumens that extend between the steering portion proximal end and the steering portion distal end,wherein said catheter assembly defines a central axis that passes through said proximal end of said shaft portion and said distal end of said steering portion, said shaft portion and said steering portion being substantially concentric about said central axis;

    a uni-directional stiffening member operatively coupled to said steering section sidewall proximate said first steering section sidewall lumen and over a standoff length of said steering portion, said uni-directional stiffening member defining a uni-directional bending portion of said steering portion and an offset axis that is radially offset from and substantially parallel to said central axis;

    a first pull wire portion extending through said central lumen and said first steering section sidewall lumen such that actuation of said first pull wire portion causes deflection of said steering portion in a first lateral direction, said first pull wire portion being routed proximate said uni-directional stiffening member,wherein during actuation of said first pull wire portion, a neutral axis of said catheter assembly along said uni-directional bending portion is proximate said offset axis such that a first bend radius of said steering portion is defined for a steering angle α

    ; and

    a second pull wire portion extending through said central lumen and said second steering section sidewall lumen such that actuation of said second pull wire portion causes deflection of said steering portion in a second lateral direction,wherein during actuation of said second pull wire portion, said neutral axis of said catheter assembly along said uni-directional bending portion is proximate said central axis such that a second bend radius of said steering portion is defined for said steering angle α

    , said second bend radius being greater than said first bend radius.

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