Luminal stent and device for inserting luminal stent

Details Luminal stent and device for inserting luminal stent Luminal stent and device for inserting luminal stent

1994-05-03

1998-06-09

Buiz, Michael

Surgery

Devices transferring fluids from within one area of body to...

528370, 606192, A61F 206, A61M 2902

Patent

active

057626251

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a luminal stent adapted to be inserted into the vessel, such as a blood vessel, lymph vessel, bile duct vessel, ureter vessel or esophagus for maintaining the shape of the vessel. More particularly, it relates to a luminal stent inserting device for inserting the luminal stent to a desired site in the vessel.


BACKGROUND ART

As this type of the luminal stent, there is known a textile structure in which linear longitudinal and transversal materials of stainless steel or the like are woven or knitted in a tube, and which may be enlarged and fitted to a site of an vasculogenetic operation.
However, this known type of the luminal stent suffers from the problem that it is harder and likely to apply the stress to the vessel to produce inflammation or excess hypertrophy susceptible to re-constriction in the vessel, and that the stent is left semi-permanently as a foreign matter in the living body which by nature acts to dispel such foreign matter.
If the luminal stent, such as a metal stent, which is left in the vessel semi-permanently or for a period longer than is necessary, is inserted into the vessel, it tends to act as a kind of a nucleus around which re-constriction is likely to occur in the vessel. In addition, if a part of the vessel in the vicinity of the stent is injured, there is a risk that the cells on the inner wall of the vessel increase in number due to multiplication to reduce the inner diameter of the vessel.


DISCLOSURE OF THE INVENTION

It is an object of the present invention to provide a luminal stent which is less susceptible to re-constriction in the vessel or reduction in the inner vessel diameter, and a device for inserting the luminal stent.
That is, the present invention is characterized in that a yarn formed of a continuous bioabsorbable polymer fibers is formed in a non-woven, non-knitted state in a shape conforming to the peripheral surface of an imaginary tubular member. Such a luminal stent is fitted on a balloon-forming portion in the vicinity of the distal end of a catheter and bonded to the balloon-forming portion by means of a bio-compatible material which does not cause any rejection symptoms.
The present invention includes a tubular luminal stent prepared in such a manner that the yarn formed of a continuous bioabsorbable polymer fibers is formed in a non-woven non-knitted state in a shape conforming to the peripheral surface of an imaginary tubular member. The stent prepared in this manner is superior in pliability and shape retentivity to other cloths, that is, non-woven fabrics like felt or a customary woven cloth prepared from weft and warp yarns. The knitted luminal stent may be further improved in pliability and shape retentivity by heat treatment (heat-setting).
The above-mentioned luminal stent is inserted into the site of vasculogenesis via a catheter provided with a balloon. If, after the luminal stent is fitted on the balloon-forming portion, the solution of the bioabsorbable polymer is applied for bonding the luminal stent to the balloon-forming portion, the luminal stent may be prevented from being deviated in its position at the time of insertion of the catheter into the vessel.
With the above-described luminal stent of the present invention, the inflammation or excess hypertrophy of the vessel is not produced and hence re-constriction may be prevented from occurring. Also, the luminal stent disappears in several months by being absorbed into the living tissue and is therefore convenient for the living body.
In addition, with the device for inserting and fixing the luminal stent of the present invention, since the luminal stent is immobilized in the balloon-forming portion, the luminal stent may be reliably inserted and fixed in the vessel.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing several morphological examples of bioabsorbable polymer fibers in the non-woven non-knitted state.
FIG. 2 is a schematic side view showing an example of a luminal stent to which the present invention is appli

REFERENCES:
patent: 4045418 (1977-08-01), Sinclair
patent: 4922905 (1990-05-01), Strecker
patent: 4950227 (1990-08-01), Savin et al.
patent: 5059211 (1991-10-01), Stack et al.
patent: 5085629 (1992-02-01), Goldberg et al.
patent: 5147399 (1992-09-01), Dellon et al.
patent: 5195984 (1993-03-01), Schatz
patent: 5274074 (1993-12-01), Tang et al.
Abstracts of 63rd Scientific Session, III-72, Supplemental III Circulation, vol. 82, No. 4, Oct. 1990.

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