Probe intended to be introduced within a living body

Details Probe intended to be introduced within a living body Probe intended to be introduced within a living body

1989-08-04

1991-03-19

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

606194, A61M 2510

Patent

active

050007343

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a probe intended to be introduced within a living body, of the type comprising an elorgoled structure adapted to be introduced into a canal in said living body conveying a fluid, and presenting, at its end intended to be introduced into the canal, a single bag element, connected to said structure, surrounding the latter and radially deformable so as to be able to come into contact with the inner wall of said canal.
Such "balloon" probes or so-called "expanding" catheters allow an intervention within a body canel, particularly a blood vessel, to treat disorders observed therein. Such disorders are generally constituted by deposite, atheromas, on the walls of the canal, bringing about stenoses thereof.
More particularly, such probes make it possible, on the one hand thanks to the radially deformable bag element, to improve the section of passage of the canal and, on the other hand, by injection of treatment product, for example through the walls of said bag element, to render long-lasting such re-establishment of the section of passage of the canal, possibly forming "in situ" a prosthesis of corresponding section.
However, during the intervention, it is necessary to maintain a minimum circulation of fluid in the body canal in order not to risk damaging the tissues or organs located downstream of the bag element, if the canal is blocked by the probe. Up to the present time, such fluid circulation is ensured either by perfusion of fluid brought from outside the body via a conduit provided in said elongated structure of the probe, or, as shown in U.S. Pat. No. 4 581 017, by "internal perfusion", lateral orifices open out in the canal being provided in said structure upstream and downstream of said bag element and being connected to one another by a "by-pass" traversing said strcture.
The first solution is not entirely satisfactory as it requires the supply of a fluid "outside" the body. Furthermore, in the two cases indicated herein-above, at least a part of the section, necessarily small, of the elogeted structure is used for the passage of the fluid, which, of course, renders more difficult, if not impossible, the passage in said structure of means for guiding the probe, or possibly of endo-scopic or surgical instruments, or the positioning of the means ensuring deformation of said bag element.
The present invention has for its object to avoid these drawbacks and relates to a probe, of the type indicated hereinabove, making it possible to maintain a minimum circulation of fluid in the body canal, whilst conserving a maximum section of free passage for said elogeted structure.
To that end, the probe, of the type indicated hereinabove, is noteworthy, according to the invention, in that it comprises at least one conduit, connected to said structure, extending at least substantially parallel to said structure and outside the latter, over a distance corresponding substantially to the longitudinal dimension of said bag element, so as to be able to place in communication those parts of said canal immediately upstream and downstream of said bag element, in order thus to maintain a minimum circulation of fluid in said canal.
In this way, the section of the said elogeted structure, at least at the level of said bag element, may be used to a maximum for the passage, as indiated herein-above, of means for guiding the probe, of endoscopic or surgical instruments, etc.
Each conduit may be made to pass on the periphery of said long structure, or on the periphery of said deformable bag element. However, it is advantageous if each conduit traverses said bag element.
Furthermore, said bag element being inflatable, according to another characteristic of the invention, each conduit is closed in the deflated state of said bag element and is open in the inflated state thereof.
According to another characteristic of the invention, the probe comprises a plurality of said conduits extending at least parallel with respect to one another.
Said conduits are advantageously angularly equi-distributed about

REFERENCES:
patent: 4183102 (1980-01-01), Guiset
patent: 4289128 (1981-09-01), Rusch
patent: 4299237 (1981-11-01), Foti
patent: 4423725 (1984-01-01), Baran et al.
patent: 4581017 (1986-04-01), Sahota
patent: 4762129 (1988-08-01), Bonzel

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