Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Patent
1998-04-03
2000-05-30
Yu, Mickey
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
623 12, A61F 206
Patent
active
060686553
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device permitting the treatment of bodily conduits in the area of a bifurcation, that is to say in the area where a principal conduit separates into two secondary conduits. It also relates to equipment for positioning this device.
This device can be used for the treatment of vascular bifurcations, in particular the carotid, femoral, iliac, popliteal, renal or coronary bifurcations, or nonvascular bifurcations, such as tracheal or biliary bifurcations, for example between the common bile and cystic ducts, or in the area of the bifurcation of the principal bile tract.
The treatment can consist in re-establishing the appropriate diameter of the bifurcation, in cases of arteriosclerosis or internal cell proliferation, in rectifying a localized or nonlocalized dissection in the wall of the conduit, or, in cases of aneurysm, in recreating a bifurcation of normal diameter, while eliminating the aneurysmal pouch.
DESCRIPTION OF THE PRIOR ART
It is known to treat narrowing of a rectilinear blood vessel by means of a radially expandable tubular device, commonly referred to as a stent. This device is introduced in the unexpanded state into the internal lumen of the vessel, in particular by the percutaneous route, as far as the area of narrowing. Once in place, it is expanded in such a way as to support the vessel wall and thus re-establish the appropriate cross section of the vessel.
The device can be made of a nonelastic material, and in this case is expanded by means of an inflatable balloon on which it is engaged, or can be self-expanding, that is to say made of an elastic material, expanding spontaneously when withdrawn from a sheath which is holding it in the contracted state.
The documents U.S. Pat. No. 4,733,665 and U.S. Pat. No. 4,886,062 are illustrative of existing devices and of corresponding positioning techniques.
A conventional stent is not entirely suitable for the treatment of a narrowing situated in the area of a bifurcation, since its engagement both in the principal conduit and in one of the secondary conduits can cause immediate or delayed occlusion of the other secondary conduit.
It is known to reinforce a vascular bifurcation by means of a device comprising two elements, each formed by helical winding of a metal filament. One of the two elements has two parts of diameter corresponding respectively to the diameter of the principal vessel and to the diameter of one of the secondary vessels, and is intended to be engaged on the one hand in this principal vessel and, on the other hand, in this secondary vessel. The other element has a diameter corresponding to the diameter of the other secondary vessel and is coupled to the first element, after the latter has been put into place, by engaging one or more of its turns in the turns of the first element.
This equipment permits reinforcement of the bifurcation but appears unsuitable for treating a vascular narrowing or an occlusive lesion, in view of its structure and of the low possibility of radial expansion of its two constituent elements.
Moreover, the shape of the first element does not correspond to the shape of a bifurcation, which has a widened transitional zone between the end of the principal vessel and the ends of the secondary vessels. Thus, this equipment does not make it possible to fully support this wall or to treat a dissection in the area of this wall.
In addition, the separate positioning of these two elements seems relatively difficult.
SUMMARY OF THE INVENTION
The present invention aims to overcome these various disadvantages by making available a device with which it is possible to treat a pathological condition in the area of a bifurcation, by fully supporting the vascular wall and by being relatively simple to position.
The device to which the invention relates comprises, in a manner known per se, segments delimiting longitudinal conduits, one of which is intended to be engaged through the bifurcation, and another of which is intended to be engaged in a secondar
REFERENCES:
patent: 4733665 (1988-03-01), Palmaz
patent: 4886062 (1989-12-01), Wiktor
patent: 5104404 (1992-04-01), Wolff
patent: 5135536 (1992-08-01), Hillstead
patent: 5540701 (1996-07-01), Sharkey et al.
patent: 5609605 (1997-03-01), Marshall et al.
patent: 5628788 (1997-05-01), Pinchuk
patent: 5632763 (1997-05-01), Glastra
patent: 5632772 (1997-05-01), Alcime et al.
patent: 5639278 (1997-06-01), Dereume et al.
patent: 5667486 (1997-09-01), Mikulich et al.
patent: 5749825 (1998-05-01), Fischell et al.
patent: 5755771 (1998-05-01), Penn et al.
patent: 5824040 (1998-10-01), Cox et al.
patent: 5824042 (1998-10-01), Lombardi et al.
patent: 5851228 (1998-12-01), Pinheiro
Laborde Jean-Claude
Seguin Jacques
Nguyen Tram A.
Yu Mickey
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