EP0349640B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Catheter equipped with expansible member and production thereof
Assignee: Terumo Corp
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Filing: 1988-02-25
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Granted: 1994-07-13
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Expires: 2008-02-25
Abstract
Abstract This invention relates to a catheter equipped with an expansible member for expanding a constricted portion inside a blood vessel which comprises an inner tube having a first lumen whose tip is open; an outer tube disposed coaxially with the inner tube, having the tip thereof at a position recessed by a predetermined length from the tip of the inner tube and forming a second lumen between it and the outer surface of the inner tube; a contractible or foldable expansible member having the tip portion fitted to the inner tube and the base end portion fitted to the outer tube, and communicating with the second lumen near the base end portion; and a rigidity imparting member having a first opening communicating with the first lumen disposed at the base end portion of the inner tube and a second opening communicating with the second lumen disposed at the base end portion of the outer tube, and disposed in at least one of the inner and outer tubes so as to extend in an axial direction. This invention relates also to a method of production of an expansible member for use in a catheter equipped with an expansible member, which comprises a step of forming a thermoplastic resin tube and heating an expansible member forming portion of this tube; a step of disposing the heated expansible member forming portion of the tube in an expansible member molding die the inner surface of which is formed in a shape obtainable when the expansible member is inflated; a step of bringing the heated expansible member forming portion of the tube disposed in the expansible member molding die into close contact with the inner surface of the molding die by pressurizing the inside of said tube; a step of cooling the expansible member forming portion of the tube; removing the expansible member molding die from the tube; and a step of cutting the molded expansible member portion off the tube.
Inventors
- 👤 Masakiyo Nobuyoshi
- 👤 Yoshiaki Sugiyama
- 👤 Kyuuta Sagae
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1027; A61M25/1029; A61M25/104; A61M2025/0004; A61M2025/1043; A61M2025/1079
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
177 words
A catheter equipped with an expansible member which comprises an inner tube (1) having a first lumen (4) whose tip is open, an outer tube (2) disposed coaxially with said inner tube, forming a second lumen (6) between it and the outer surface of said inner tube (1), a contractible or foldable expansible member (3) having a tip portion fitted to said inner tube (1) and a proximal portion fitted to said outer tube (2), and communicating with said second lumen near said proximal portion, a first opening (9) communicating with said first lumen (4) disposed at the proximal portion of said inner tube (1), a second opening (11) communicating with said second lumen (6) disposed at the proximal portion of said outer tube (2), the tip of said outer tube (2) being at a position recessed by a predetermined length from the tip of said inner tube (1), characterized in that a rigidity imparting member (13) is disposed at at least one of said inner and outer tubes so as to extend in the axial direction.
Claim 2
Dependent Claim
20 words
A catheter according to claim 1 wherein said expansible member (3) is made of polyolefin, polyvinylchloride, polyamide elastomer or polyester.
Claim 3
Dependent Claim
23 words
A catheter according to claim 1 or 2, wherein said expansible member (3) has a substantially cylindrical portion (3a) having approximately equal diameter.
Claim 4
Dependent Claim
27 words
A catheter according to any claim 1 to 3, wherein a forward and a backward portion of said cylindrical portion (3a) of said expansible member are tapered.
Claim 5
Dependent Claim
20 words
A catheter according to claim 2, wherein said polyolefin is polyethylene, polypropylene, ethylene-vinyl acetate copolymer or cross-linked ethylene-vinyl acetate copolymer.
Claim 6
Dependent Claim
37 words
A catheter according to any preceding claim, wherein said first opening and said second opening are disposed at a branched hub (20) attached to the proximal ends of said inner tube (1) and said outer tube (2).
Claim 7
Dependent Claim
45 words
A catheter according to any claims 1 to 6, wherein an outer surface of said outer tube and said expansible member has been submitted to a hydrophilic treatment so as to exhibit lubricancy when said outer surface is brought into contact with blood during use.
Claim 8
Dependent Claim
36 words
A catheter according to claim 7, wherein said hydrophilic treatment is carried out by coating a hydrophilic polymer selected from poly(2-hydroxyethylmethacrylate), polyhydroyethylacrylate, hydroxypropylcellulose, methyl vinyl ether - maleic anhydride copolymer, polyethylene glycol, polyacrylamide and polyvinyl pyrrolidone.
Claim 9
Dependent Claim
20 words
A catheter according to any preceding claim, wherein said rigidity imparting member (13) is disposed at said inner tube (1).
Claim 10
Dependent Claim
23 words
A catheter according to any of claim 1 to 6, wherein said rigidity imparting member (13) is disposed at said outer tube (2).
Claim 11
Dependent Claim
26 words
A catheter according to any of claim 1 to 6, wherein said rigidity imparting member (13) is disposed at both of said inner and outer tubes.
Claim 12
Dependent Claim
41 words
A catheter according to any of claim 1 to 6, wherein said outer tube (2) has said rigidity imparting member (13) extending in the axial direction and said rigidity imparting member is not disposed at the tip of said outer tube.
Claim 13
Dependent Claim
31 words
A catheter according to claim 12, wherein the portion not having said rigidity imparting member is formed with an annular member (25) disposed at the tip of said outer tube (2).
Claim 14
Dependent Claim
50 words
A catheter according to any of claim 1 to 6, wherein said inner tube (1) has said rigidity imparting member (13) extending in the axial direction from the proximal portion to the tip portion and, further, said rigidity imparting member is not disposed at the tip of said inner tube.
Claim 15
Dependent Claim
43 words
A catheter according to claim 14, wherein said rigidity imparting member disposed at said inner tube is provided at least from the proximal portion of said inner tube to the portion corresponding to the contractible or foldable portion of said expansible member (3).
Claim 16
Dependent Claim
35 words
A catheter according to claim 14, wherein the tip of said inner tube is formed with an annular member (25) attached to said tip of said inner tube and not having said rigidity imparting member.
Claim 17
Dependent Claim
27 words
A catheter according to any of claim 1 to 6, wherein said rigidity imparting member (13) is embedded inside of said inner tube or said outer tube.
Claim 18
Dependent Claim
29 words
A catheter according to any of claim 1 to 6, wherein said rigidity imparting member is embedded in the outer surface of said inner tube or said outer tube.
Claim 19
Dependent Claim
27 words
A catheter according to any of claim 1 to 6, wherein said rigidity imparting member is a braided member formed by wire material in a mesh-like manner.
Claim 20
Dependent Claim
13 words
A catheter according to claim 19, wherein said wire material is metal wire.
Claim 21
Dependent Claim
15 words
A catheter according to claim 19, wherein said wire material is made of synthetic fibers.
Claim 22
Dependent Claim
21 words
A catheter according to claim 21, wherein said synthetic fiber is any one of polyamide fibers, polyester fibers and polypropylene fibers.
Claim 23
Dependent Claim
154 words
A method of producing a catheter as set forth in claim 1, which comprises the steps of: forming an inner tube (1) having a lumen opened from the tip to the rear end; forming an outer tube (2) having a lumen opened from the tip to the rear end, with the inner diameter being larger than the outer diameter of said inner tube said outer tube being formed shorter by a predetermined length than said inner tube; disposing a rigidity imparting member (13) at at least one of said inner and outer tubes, forming separately a contractible or foldable expansible member (3) having a tip portion and a proximal portion; inserting said inner tube to the inside of said outer tube; securing said proximal portion of said expansible member to the tip portion of said outer tube; and securing said tip portion of said expansible member to the tip portion of said inner tube.
Claim 24
Dependent Claim
40 words
A method according to claim 23, wherein said step of forming said inner tube (1) comprises forming a tube member and said step of disposing a rigidity imparting member (13) comprises disposing said rigidity imparting member at said tube member.
Claim 25
Dependent Claim
40 words
A method according to claim 23, wherein said step of forming said outer tube (2) comprises forming a tube member and said step of disposing a rigidity imparting member (13) comprises disposing said rigidity imparting member at said tube member.
Claim 26
Dependent Claim
50 words
A method according to claim 24 or 25, wherein said step of disposing said rigidity imparting member (13) comprises applying said rigidity imparting member to said tube member forming said inner tube (1) or said outer tube (2) and embedding the thus applied rigidity imparting member into said tube member.
Claim 27
Dependent Claim
71 words
A method according to any of claim 23 to 26, wherein said step of securing said tip portion of said expansible member (3) to said tip portion of said inner tube (1) is conducted after securing said proximal portion of said expansible member (3) to said tip portion of said outer tube (2) and then inserting said inner tube (1) into said outer tube (2) secured with said expansible member (3).
Claim 28
Dependent Claim
47 words
A method according to any of claim 23 to 27 wherein said step of securing said tip portion of said expansible member (3) to said tip portion of said inner tube (1) comprises securing said tip portion of said expansible member (3) by heat shrinkage under heating.
Claim 29
Dependent Claim
45 words
A method according to any of claim 23 to 28, wherein said step of securing said tip portion of said expansible member (3) to said tip portion of said inner tube (1) comprises securing said proximal portion of said expansible member by heat-shrinkage under heating.
Claim 30
Dependent Claim
61 words
A method according to any of claim 23 to 29, further comprising a step of forming an opening to the proximal portion of said inner tube (1) in communication with said lumen of said inner tube and a step of forming an opening to the proximal portion of said outer tube (2) in communication with said lumen of said outer tube.
References Cited (Backward Citations)
JPS5321910Y2
Cited
JPS5838565A
Cited
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