System and method for removal of material from a blood vessel using a small diameter catheter
First Claim
1. A small-diameter material-removal device comprising:
- a thin-walled outer sheath constructed from polymer, at least at a distal part thereof, and including a proximal end and a distal end; and
a core wire having, at a distal end, a capture segment comprising a plurality of radially directed wire sections adapted to be retracted within and to extend from the distal end of the sheath and an opposing actuator handle at a proximal end that extends from the proximal end of the sheath constructed and arranged so that applying axial movement to the handle causes the capture segment to extend from a retracted state wherein the wires are housed fully within the sheath to an extended state wherein the wires define a radially directed shape for engaging a distal face of a material within a blood vessel.
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Accused Products
Abstract
This invention provides a small diameter snare device and device for thrombus removal consisting of a hollow, elongate, thin-walled outer sheath constructed from polymer, at least at a distal part thereof. A single central core wire extends through the entire length of the sheath. The outer diameter of the core wire is sized close to the inner diameter of the sheath while allowing for axial sliding, in order to maximize the support to the body portion of the snare device. The distal end of the core wire has a tapered section of reduced diameter or cross section to provide a “guidewire-like” flexibility to the distal portion of the device. A second wire (or wires) of about fifty percent or less of the inner diameter of the sheath is (are) shaped to form a snare loop or radially extended tool tip that is attached to the distal most portion of the central core wire. The snare loop is typically circular or oval shaped and can also be multiplanar (for example, a twisted, figure eight shape) so as to increase the ability to ensnare and capture objects. The tool tip can be a planar or multi-planar, proximally directed structure that, when deployed, is adapted to engage the thrombus from behind after piercing the thrombus with the sheath while the tool tip is retracted.
202 Citations
35 Claims
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1. A small-diameter material-removal device comprising:
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a thin-walled outer sheath constructed from polymer, at least at a distal part thereof, and including a proximal end and a distal end; and
a core wire having, at a distal end, a capture segment comprising a plurality of radially directed wire sections adapted to be retracted within and to extend from the distal end of the sheath and an opposing actuator handle at a proximal end that extends from the proximal end of the sheath constructed and arranged so that applying axial movement to the handle causes the capture segment to extend from a retracted state wherein the wires are housed fully within the sheath to an extended state wherein the wires define a radially directed shape for engaging a distal face of a material within a blood vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for using a small-diameter thrombus-removal device comprising the steps of:
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directing a thin-walled outer sheath constructed, at least at a distal part, from polymer and including a proximal end and a distal end into and through a thrombus in a blood vessel while a capture segment is retracted into the distal end of the sheath;
deploying the capture segment so that a plurality of wire sections extend radially; and
engaging the thrombus and withdrawing the engaged thrombus proximally out of the blood vessel. - View Dependent Claims (32, 33, 34, 35)
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Specification