Surgery – Instruments – Means for inserting or removing conduit within body
Patent
1995-12-11
1998-10-06
Bockelman, Mark
Surgery
Instruments
Means for inserting or removing conduit within body
606194, 623 1, 623 12, A61F 1100
Patent
active
058171002
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a stent device introduced into a vessel, such as blood vessel, via e.g., a catheter. More particularly, it relates to a stent supplying system employing the stent device.
BACKGROUND ART
Up to now, there is known a vessel stent introduced into the vessel, such as blood vessel, esophagus, trachea, bronchial tubes, bile-duct or ureter for retaining the shape of the vessel. For example, a stent is attached for prohibiting re-constriction of the blood vessel after percutaneous transluminal angioplasty (PTA) on the constricted portion of the blood vessel, such as arterial vessel. The PTA is an operation consisting in introducing a balloon-forming portion attached to the distal end of a catheter in a constricted portion of the blood vessel and dilating the balloon forming portion for dilating the constricted portion for improving the blood flow.
As such stent, a self-expandable stent, which is contracted in diameter under an external pressure and dilated on removing the external pressure, a balloon dilated stent (mechanically expanded stent) dilated by e.g., a balloon and maintained in the dilated state even after removing the balloon, and a shape memory stent formed of a shape memory resin or a shape memory alloy.
There are a variety of sorts of the stent and the catheter or a system constituted by a stent-dilating mechanism, or a so-called stent delivery system.
For example, the stent delivery system employing the balloon dilated stent is classified by the stent holding methods which may be exemplified by a method employing a so-called sleeve (as shown for example in U.S. Pat. No. 4,950,227), a method employing a protective sheath, a method employing an adhesive, and a method of mechanical caulking.
Similarly, the method employing the shape memory stent may be classified into a method exploiting temperature changes for dilation and a method exploiting the phenomenon of maintaining the same shape but of being changed in property, such as strength, with changes in temperature.
Recently, the progress in the field of the catheter is significant. In particular, the balloon catheter is diversified in shaft design, flexibility, material of the ballooning portion and reduction in outside diameter. It is up to the operator to select an optimum type depending upon symptoms or the like in order to achieve good results.
However, with the stent delivery system, such as one employing a balloon dilated stent, the sort of the balloon catheter is defined once the sort of the stent is defined, such that a catheter not desirable has to be used from time to time.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a stent device which can be loaded on any sort of the balloon catheter and which enables an arbitrary stent to be used in combination with an arbitrary catheter.
It is another object of the present invention to provide a stent supply system which enables the stent to be smoothly introduced into the vessel. It is a further object of the present invention to provide a stent device attachment method which enables a stent device to be easily attached to a balloon catheter.
For accomplishing the above objects, the present invention provides a stent device including a stent fitted on the outer peripheral surface of a radially dilatable and contractible tubular cartridge.
With the stent device of the present invention, the sorts of the stent can be selected freely. Thus the stent may be of any desired configuration, such as diamond-meshed, sheet-shaped, knitted, woven or coil-shaped configurations. The stent material may also be optionally selected from metal, synthetic resin and biodegradable materials. Most preferred is a knitted stent formed of fibers of the biodegradable material.
Although the material of the tubular cartridge is optional, such a material as is extendable and contractible radially and hardly extendable and contractible axially is most preferred. The tubular cartridge exhibiting flexibility and ease in bending is preferred in consid
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Bockelman Mark
Kabushikikaisya Igaki Iryo Sekkei
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