Stent retrieval device

Details Stent retrieval device Stent retrieval device

1999-09-14

2001-02-13

Philogene, Pedro (Department: 3732)

Surgery

Instruments

Means for inserting or removing conduit within body

C606S191000, C606S192000, C606S194000

Reexamination Certificate

active

06187016

ABSTRACT:

BACKGROUND OF THE INVENTION
Often times following balloon angioplasty, it is necessary to insert a coronary stent into the artery to keep the artery open. On occasion it is necessary to remove the stent from the artery. There are a number of devices that have been proposed for this purpose. One is shown in U.S. Pat. No. 5,098,440 Hillstead which is a loop device for engaging the stent and removing it. Another is U.S. Pat. No. 5,464,408 Duc which utilizes two flexible tubes with a number of gripping members which are part of the inner tube which are directed to engage the stent and pull it into the outer tube. U.S. Pat. No. 4,990,151 Wallsten shows a stent removal device where the portion which engages the stent is straight and would not expand the artery to permit the stent to be drawn back more easily.
In balloon angioplasty, a small radiopaque guidewire is steered through a coronary guiding catheter and down a coronary artery past the area of blockage and over the wire. The physician then passes a thin flexible tube with a balloon at the end of it into the blocked artery. By inflating the balloon, the plaque causing the blockage is pressed back against the artery wall. Doing this, of course, opens the artery and increases the blood flow through the artery to the heart muscle. When the coronary stent is introduced into the blood vessel, it is collapsed down upon the balloon catheter until it reaches the narrow area of the artery. Sometimes, however, the stent may slip back off the balloon or become dislodged in the placement process and must be retrieved.
BRIEF SUMMARY OF THE INVENTION
The invention involves a stent retrieval device which may be guided along the radiopaque guidewire to the location where the stent is to be removed at which time the fingers of the device are pushed out of the tube in which they have been carried. They are naturally biased outward so that they will expand the artery and go over the stent and then grip it as the fingers are drawn back thus keeping the artery expanded and enabling the stent to be readily withdrawn from its location in the artery.
It is therefore an object of this invention to provide a stent removal device which may be inserted into an artery and grip a stent by enveloping it between the stent and the interior artery wall, and thus grasp it and remove it.
It is a further object of this invention to provide such a stent removal device that may be guided along the radiopaque guidewire.
This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.


REFERENCES:
patent: 4990151 (1991-02-01), Wallsten
patent: 5098440 (1992-03-01), Hillstead
patent: 5464408 (1995-11-01), Duc
patent: 5474563 (1995-12-01), Myler et al.
patent: 5520697 (1996-05-01), Lindenberg et al.
patent: 5624450 (1997-04-01), Glastra
patent: 5910144 (1999-06-01), Hayashi
patent: 6027508 (2000-02-01), Ren et al.
patent: 6027509 (2000-02-01), Schatz et al.

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