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Patent EP0433447B1 successfully refreshed from Google Patents.
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EP0433447B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Catheter

Assignee: Terumo Corp
•
Filing: 1988-08-12
•
Granted: 1994-06-22
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Expires: 2008-08-12
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Abstract

Abstract This invention relates to a catheter equipped detachably at the tip thereof with a cylindrical expansion holding member of expanding the inner diameter of the lumen of the blood vessel or other tubular organ and for holding it in an expanded state either temporarily or permanently. The tip of the catheter which supports this member has a sufficiently smaller outer diameter than those of the other portions and the outer diameter of the expansion holding member is equal to, or smaller than, the outer diameters of the rest of portions of the catheter even when the expansion holding member is supported at the tip. The expansion holding member is made of a shape memory alloy so that it can expand or contract in the radial direction with a temperature change. Expansion or contraction of this member is made by causing the outflow of a heated or cooled liquid from a side hole bored at said tip of the catheter and bringing it into contact with the expansion holding member.

Inventors

  • 👤 Fumiaki Harada

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 12:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/95; A61F2/82; A61F2/86; A61F2/88; A61F2/0004; A61F2210/00; A61F2210/0014; A61F2210/0019; A61F2210/0023; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 190 words
A catheter comprising a catheter tube (11) having an open proximal end and at least one side opening formed on a circumferential wall near a distal end of said catheter tube to communicate with an opening at said proximal end, a hub portion (12) formed to communicate with said opening at said proximal end of said catheter tube, an expansion holder (13) for holding an inner diameter of an internal cavity of a tubular organ, said expansion holder being made of a shape memory alloy cylinder which can radially expand or contract upon changes in temperature, and said expansion holder being mounted to cover at least part of a catheter tube portion (11a) corresponding to said side opening, an outer diameter of said catheter tube portion (11a) corresponding to said side opening being smaller than that of other catheter tube portions, and said expansion holder (13) is mounted on said catheter tube portion (11a) corresponding to said side opening characterized in that an outer diameter of said expansion holder is equal to or smaller than that of other catheter tube portions and said catheter tube may have two open ends.
Claim 2
Dependent Claim 25 words
A catheter according to claim 1, wherein at least one X-ray non-transmission marker is formed on said catheter tube portion corresponding to said side opening.
Claim 3
Dependent Claim 18 words
A catheter according to claims 1 or 2, wherein at least one port is added to said hub.
Claim 4
Dependent Claim 44 words
A catheter according to any preceding claim, characterized in that at least part of a distal end portion in front of said catheter tube portion corresponding to the side opening has an outer diameter substantially equal to that of said other catheter tube portions.
Claim 5
Dependent Claim 15 words
A catheter according to any preceding claim, wherein said expansion holder has a helical shape.
Claim 6
Dependent Claim 17 words
A catheter according to any preceding claim wherein said shape memory alloy exhibits unidirectional shape memory properties.
Claim 7
Dependent Claim 21 words
A catheter according to any one of claims 1 to 5 wherein said shape memory alloy exhibits bidirectionnal shape memory properties.

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