EP0286108A2
Expired / Lapsed
EP
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Medical tool introduction cannula and method of manufacturing the same
Assignee: Terumo Corp
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Filing: 1988-04-07
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Granted: —
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Expires: 2008-04-07
Abstract
Abstract Medical instrument introduction cannula, which is useful as a guide means for introducing and indwelling a rod-like medical instrument such as a catheter and a guide wire. This cannula is removed after use from the medical instrument by being splitted. This cannula is formed of a hollow tubular body (11) having a strip member (13) consisting of a material different from the other portion of the tubular body (11), which extends over the entire or almost the entire length of the tubular body (11). The strip member (13) has a weld line (14) along the length of the strip member, or consists of a resin which exhibits a good bonding property only to one of the other components forming the tubular body. The tubular body (11) can be splitted by way of the weld line (14) or the removal of the strip member having such a bonding property. The method of manufacturing the medical instrument intruduction cannular by a two-color extruder is also disclosed.
Inventors
- 👤 Tadashi Kousai
- 👤 Toshinobu Ishida
- 👤 Yousuke Moriuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/06; A61M25/0662; A61M25/0668; A61M25/0009; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29L; B29L2031/00; B29L2031/753; B29L2031/7542
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
110 words
(1) A medical tool introduction cannula (11) for introducing a rod-like medical tool into a living body, characterized in that said introduction cannula (11) comprises a hollow tubular body of a synthetic resin capable of inserting said rod-like medical tool therethrough, at least one portion of said hollow tubular body is formed by a strip member (13) of a material different from the other portion of said hollow tubular body to extend over the entire length of said tubular body or over the entire length excluding a distal end portion, and a weld line (14) which is bonded with a relatively weak force is longitudinally formed in said strip member.
Claim 2
Dependent Claim
41 words
(2) An introduction cannula according to claim 1, characterized in that the distal end of said tubular body is machined to be in tight contact with an inner cannula inserted therethrough, and a base portion (11c) thereof has an extended shape.
Claim 3
Dependent Claim
24 words
(3) An introduction cannula according to claim 1, characterized in that a pair of said strip members are arranged to radially oppose each other.
Claim 4
Dependent Claim
17 words
(4) An introduction cannula according to claim 1, characterized in that said strip member (13) is colored.
Claim 5
Dependent Claim
21 words
(5) An introduction cannula according to claim 1, characterized in that the other portion of said hollow tubular body is colored.
Claim 6
Dependent Claim
29 words
(6) An introduction cannula according to claim 1, characterized in that said strip member (13) and the other portion of said hollow tubular body are colored in different colors.
Claim 7
Dependent Claim
66 words
(7) An introduction cannula according to claim 1, characterized in that a main portion of said hollow tubular body is formed of a material selected from the group consisting of polypropylene, polyethylene, and poly-4-methyl-pentene-1, and said strip member is formed of a material selected from the group consisting of a polypropylene/ethylene-vinyl acetate copolymer, polypropylene/polyethylene, a polyethylene/ethylene-vinyl acetate copolymer, a methylpentene polymer/ethylene-vinyl acetate copolymer, and methylpentene polymer/polyethylene.
Claim 8
Dependent Claim
169 words
(8) A method of manufacturing a medical tool introduction cannula for introducing a rod-like medical tool into a living body, characterized in that said introduction cannula comprises a hollow tubular body capable of inserting said rod-like medical tool therethrough, at least one portion of said hollow tubular body is formed by a strip member (13) of a material different from the other portion of said hollow tubular body to extend over the entire length of said tubular body or over the entire length excluding a distal end portion (11b), and a weld line (14) which is bonded with a relatively weak force is longitudinally formed in said strip member (13), characterized in that molding resin flows for forming the strip member are divided by at least one buffer plate (18) which is disposed near a die outlet port (21) of a molding resin flow path of an extruder and are subsequently joined and the joined flow is extruded from said die outlet port (21) to mold said introduction cannula.
Claim 9
Dependent Claim
37 words
(9) A method according to claim 8, characterized in that said buffer plate is positioned so that a distal end thereof is separated from an edge portion of the die outlet port by 0 to 5 mm.
Claim 10
Dependent Claim
34 words
(10) A method according to claim 9, characterized in that a height of said buffer plate (18) is set to be not less than 1/2 that of the resin flow path of the die.
Claim 11
Dependent Claim
26 words
(11) A method according to claim 9, characterized in that the molding resin flows are initially one integral resin flow before divided by the buffer plate.
Claim 12
Dependent Claim
172 words
(12) A medical tool introduction cannula (31) for introducing a rod-like medical tool such as a catheter into a living body, characterized in that said introduction cannula (31) comprises a tubular body having a longitudinal hollow portion capable of receiving said medical tool therethrough, said tubular body (33) consists of a plurality of strip members (34) which are liquid-tightly integrated to extend along a longitudinal direction of said tubular body (33), one strip member (34) consists of a molded body of a mixture of a plurality of materials and is formed of a material essentially having no bonding property with at least one material of the other strip member adjacent thereto and a material having good bonding property therewith, said strip members (32) are bonded with a strength which which said strip members (32) can be separated by a predetermined force, and after said medical tool is introduced, said strip members (32) are separated by the predetermined force to remove said introduction cannula from said medical tool inserted in said hollow portion.
Claim 13
Dependent Claim
69 words
(13) An introduction cannula according to claim 12, characterized in that one of said linear members consists of a molded body of a mixture of first and second materials, the other strip member (32) contacting said one strip member consists of a molded body of a third material, said first and third materials essentially have no bonding property, and said second and third materials have a good bonding property.
Claim 14
Dependent Claim
19 words
(14) An introduction cannula according to claim 12, characterized in that said first material consists of a polyolefin-based resin.
Claim 15
Dependent Claim
30 words
(15) An introduction cannula according to claim 13, characterized in that said second material is prepared by modifying the polyolefin-based resin to improve a bonding property with said third material.
Claim 16
Dependent Claim
30 words
(16) An introduction cannula according to claim 13, characterized in that said third material is a material selected from the group consisting of a polyamide-based resin and a polyester-based resin.
Claim 17
Dependent Claim
21 words
(17) An introduction cannula according to claim 13, characterized in that said second material consists of a maleic acid-modified polyolefin resin.
Claim 18
Dependent Claim
44 words
(18) An introduction cannula according to claim 13, characterized in that said first material consists of a polyamide-based resin or polyester-based resin, said secohd material consists of a modified polyolefin resin, and said third material consists of a polyester-based resins and a polyolefin-based resin.
Claim 19
Dependent Claim
29 words
(19) An introduction cannula according to claim 13, characterized in that said second material is prepared by modifying the same type of polymer as that of said third material.
Claim 20
Dependent Claim
49 words
(20) An introduction cannula according to claim 13, characterized in that said first material consists of a polyolefin-based resin, said second material consists of a modified polyolefin-based resin, and said third material consists of a material selected from the group consisting of a polyamide-based resin and a polyester-based resin.
Claim 21
Dependent Claim
37 words
(21) An introduction cannula according to claim 13, characterized in that said first material consists of a polyester-based resin, said second material consists of a modified polyolefin-based resin, and said third material consists of a polyolefin-based resin.
Claim 22
Dependent Claim
24 words
(22) An introduction cannula according to claim 19, characterized in that said second material is prepared by modifying the polyolefin-based resin with maleic acid
Claim 23
Dependent Claim
32 words
(23) An introduction cannula according to claim 16, characterized in that said third material consists of a material selected from the group consisting of 6-nylon, 6,6-nylon, 11-nylon, polyethylene terephthalate, and polybutylene terephthalate.
Claim 24
Dependent Claim
21 words
(24) An introduction cannula according to claim 13, characterized in that said second and third materials consist of an identical material.
Claim 25
Dependent Claim
33 words
(25) An introduction cannula according to claim 24, characterized in that said second and third materials consist of a material selected from the group consisting of polypropylene, polyethylene, and an ethylene-vinyl acetate copolymer.
Claim 26
Dependent Claim
52 words
(26) An introduction cannula according to claim 25, characterized in that said first material consists of the ethylenevinyl acetate copolymer, said second material consists of polypropylene, a mixing ratio (weight ratio) of said first and second materials is 1 : 1 to 1 : 5, and said third material consists of polypropylene.
Claim 27
Dependent Claim
28 words
(27) An introduction cannula according to claim 26, characterized in that the mixing ratio (weight ratio) falls within the range of 1 : 3 to 1 : 5.
Claim 28
Dependent Claim
17 words
(28) An introduction cannula according to claim 12, characterized in that the one strip member is colored.
Claim 29
Dependent Claim
17 words
(29) An introduction cannula according to claim 12, characterized in that the other strip member is colored.
Claim 30
Dependent Claim
20 words
(30) An introduction cannula according to claim 12, characterized in that both said strip members are colored in different colors.
Claim 31
Dependent Claim
157 words
(31) A medical instrument assembly comprising: (a) a medical tool introduction cannula for introducing a rod-like medical tool into a living body, characterized in that said introduction cannula comprises a hollow tubular body (11) of a synthetic resin capable of inserting said rod-like medical tool therethrough, at least one portion of said hollow tubular body is formed by a strip member (13) of a material different from the other portion of said hollow tubular body to extend over the entire length of said tubular body (11) or over the entire length excluding a distal end portion, and a weld line (14) which is bonded with a relatively weak force is longitudinally formed in said strip member; and (b) a syringe (2) fitted with an inner cannula, and detachably inserted into the medical tool introduction cannula (11) such that a distal end of the inner cannula is projected from a tip end of the medical tool introduction cannula.
Claim 32
Dependent Claim
214 words
(32) A medical instrument assembly comprising: (a) a medical tool intruduction cannula for introducing a rod-like medical tool such as a catheter into a living body, characterized in that said introduction cannula (31) comprises a tubular body having a longitudinal hollow portion capable of receiving said medical tool therethrough, said tubular body consists of a plurality of strip members (34) which are liquid-tightly integrated to extend along a longitudinal direction of said tubular body, one strip member consists of a molded body of a mixture of a plurality of materials and is formed of a material essentially having no bonding property with at least one material of the other strip member adjacent thereto and a material having good bonding property therewith, said strip members (34) are bonded with a strength which said strip members (34) can be separated by a predetermined force, and after said medical tool is introduced, said strip members (34) are separated by the predetermined force to remove said introduction cannula from said medical tool inserted in said hollow portion; and (b) a syringe (2) fitted with an inner cannula, and detachably inserted into the medical tool introduction cannula (31) such that a distal end of the inner cannula is projected from a tip end of the medical tool introduction cannula.
References Cited (Backward Citations)
No citation records indexed.
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