Importance

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Abstract

A pullback device for axial positioning of a core of an intravascular catheter, including a pullback chassis having a catheter extension extending therefrom for attachment of the intravascular sheath with a distal passage therethrough and an interface unit extension for attachment of an interface unit with a proximal passage therethrough. An intermediate sheath receives and encloses the intravascular catheter drive cable and has a pullback loop for enclosing the drive cable. The pullback loop includes a fixed segment attached to the proximal passage through the interface unit extension and a variable segment extending towards the distal end of the intravascular sheath and having a sliding section adjoining the distal end of the intravascular sheath. When the catheter is attached to the device, the catheter drive cable extends from the proximate end of the intravascular catheter and through the distal passage, the intermediate sheath and the proximal passage for connection to the interface unit wherein the drive cable forms a loop contained within the intermediate sheath pullback loop forming a loop between the distal and proximal passages. The intermediate sheath is attached to an attachment point of an actuating member and the actuating member acts to increase and decrease the length of the sliding section of the variable segment included in the pullback loop, thereby enlarging and reducing the diameter of the pullback loop and the length of drive cable contained in the pullback loop to control the axial location of the working head.

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First Claim