Temporary vascular filter, guide wire
a technology of vascular filter and guide wire, which is applied in the field of vascular filter, can solve the problems of inability to adjust during the procedure, the operator's ability to use balloon catheters and stent devices involving the same procedure, and the inability to achieve the use of filter protection in place, so as to achieve the effect of reducing complexity and facilitating modification of relative spacing between the filter and the lesion location
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first embodiment
[0034] In order to reach the lesioned area, however, the catheter must be able to follow a trackable path defined by a catheter guide wire. In accordance with the present invention, a catheter guide wire, generally designated 30, provides a trackable path for a catheter and includes a distally disposed collapsible filter 50 to trap particulate matter dislodged by the catheter 20 during treatment of the stenosis.
[0035] Referring now to FIGS. 2 through 5, the guide wire 30 includes a proximal section 32 comprising a solid core wire 34 having a wave-shaped proximal end 36 (FIG. 2). A tubular shaft 38 is coaxially disposed around the core wire and includes an outer diameter equal to the nominal size of the guide wire. The inner diameter of the tube is sized to form a friction fit with the core wire proximal end when slid thereover during insertion and removal of the guide wire. The shaft functions to deploy and retract the filter device, and to guide and support the catheter 20, and to ...
embodiment 80
[0046] The alternative filter embodiment 80 may be fabricated similar to the procedure above with only minor variations. Conveniently, because of the composite nature and relatively high pic density of the metallic / polymeric braid, only one braiding step is required. After the final braid, the polymeric strands at the proximal end are mechanically or thermally cut away, and the filaments fused at the large diameter of the formed cone to form the collection cavity and to allow for greater blood flow.
[0047] In operation, the guide wire 30 may be advanced through a vascular system in any conventional manner to establish a path for the catheter to track over. Generally, as shown in FIG. 1, the guide wire is inserted through the lesion and disposed downstream of the lesion 24 a variably selected distance. The distance selected by the operator may be conveniently adjusted merely by further advancing or slightly withdrawing the guide wire. This provides the highly desirable capability of e...
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