Temporary vascular filter guide wire
First Claim
1. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:
- an elongated flexible core wire having a proximal end and a distal end for insertion and steerage through a patient'"'"'s vasculature to a position downstream of said lesion;
a tubular flexible shaft slidably disposed along said core wire, said shaft including a proximal portion and a distal portion disposed proximally of said core wire distal end for placement downstream of said lesion; and
a collapsible filter coupled at its proximal end to said distal portion of said shaft and at its distal end to said core wire, said filter operable in response to the relative is displacement between said shaft and said core wire to radially extend outwardly within said vasculature and trap particulate matter arising from the treatment of said lesion.
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Accused Products
Abstract
A temporary filter is described for use in percutaneous intravascular procedures for the treatment of diseased blood vessels, such as angioplasty or stent placement procedures. The guide wire which is used to direct a catheter (such as a balloon catheter) to a treatment site contains a deployable filter. The guide wire is moveable independently of the catheter and can be used to position the filter at a desired location downstream of the treatment site. The guide wire includes parts moveable with respect to each other and the filter is connected to these parts in such a way that it can be deployed and collapsed by relative movement of the parts.
222 Citations
32 Claims
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1. A vascular filter guide wire for directing placement of a catheter with respect to a blood vessel lesion and filtering particulate matter dislodged by treatment of said vessel, said guide wire including:
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an elongated flexible core wire having a proximal end and a distal end for insertion and steerage through a patient'"'"'s vasculature to a position downstream of said lesion;
a tubular flexible shaft slidably disposed along said core wire, said shaft including a proximal portion and a distal portion disposed proximally of said core wire distal end for placement downstream of said lesion; and
a collapsible filter coupled at its proximal end to said distal portion of said shaft and at its distal end to said core wire, said filter operable in response to the relative is displacement between said shaft and said core wire to radially extend outwardly within said vasculature and trap particulate matter arising from the treatment of said lesion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A vascular filter guide wire for directing precision placement of a catheter with respect to a lesion and filtering particulate matter dislodged by treatment of said lesion, said guide wire including:
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an actuating mechanism;
an elongated flexible core wire having a proximal end attached to said actuating mechanism and a distal end for insertion and steerage through a patient'"'"'s vasculature to a position downstream of said lesion;
a tubular flexible shaft slidably disposed along said core wire, said shaft including a proximal portion affixed to said actuating mechanism in movable relation to said wire, and a distal portion disposed inwardly from the distal end of said core wire for placement downstream of said lesion;
a locking mechanism to maintain said filter in an extended position during lesion treatment; and
a collapsible filter coupled to said shaft distal portion, said filter including a collapsible support cage having respective front and back halves for slidably extending and retracting axially along said wire, said cage having a first end fixed to the distal extremity of said shaft, and an opposite end mounted to said core wire distal end, said strainer further including a continuous woven mesh disposed within said support cage for straining particulate matter and operable, in response to manual manipulation of said actuating mechanism to effect relative displacement between said shaft and said core wire, to radially extend outwardly within said vasculature and trap particulate matter arising from the treatment of said lesion.
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22. A catheter system for treating a blood vessel lesion within a vasculature, said catheter system including:
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a catheter having a lesion treatment device; and
a vascular filter guide wire for directing said balloon catheter to said lesion, said guide wire including a collapsible filter for manual deployment downstream of said balloon catheter to trap particulate matter arising from the treatment of said lesion. - View Dependent Claims (23, 26, 27, 29, 30, 31, 32)
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24. A method of filtering particulate debris from a vasculature caused by treatment of a lesion with a lesion treatment device, said catheter guided to the location of said lesion by a vascular filter guide wire having a core wire, a slidable shaft, and a manually collapsible filter mounted on the shaft and deployable upon relative displacement between said core wire and said shaft, said method including the steps of:
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guiding said vascular filter guide wire through said vasculature along a predetermined path to a lesion such that said filter is disposed downstream of said lesion;
deploying said filter radially outwardly by shifting said shaft relative to said core wire;
running said catheter over said guide wire along said predetermined path to position said lesion treatment device proximate said lesion;
treating said lesion according to a predetermined procedure;
maintaining said filter in a deployed position to trap particulate matter dislodged during said lesion treatment and prevent said matter from progressing downstream;
withdrawing said catheter from said vasculature;
retracting said filter radially inwardly by shifting said shaft back to said original position; and
removing said guide wire from said vasculature.
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25. A vascular filter for controllably expanding within a blood vessel to trap particulate matter loosened from a lesion, said filter responsive to relatively shiftable control elements to expand and retract, said filter including:
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a braid comprising a composite metallic/polymeric material, said material including a plurality of metallic filaments mounted to said respective shiftable shaft and core wire to define a support structure, and a polymeric mesh interwoven with said metallic filaments to define a strainer.
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28. A method of fabricating a vascular filter, said method including the steps of:
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selecting a mandrel having a plurality of consecutively connected forms;
weaving a continuous layer of braid over said consecutively connected forms;
bonding said braid filaments at spaced apart sections between respective forms;
separating said respective braided forms at said bonded sections; and
removing said forms from said layer of braid.
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Specification