EP0420488A1
Expired / Lapsed
EP
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Multilayer extrusion as process for making angioplasty balloons
Assignee: Schneider USA Inc
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Filing: 1990-09-19
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Granted: —
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Expires: 2010-09-19
Abstract
Abstract A method of producing laminated inflatable, substantially inextensible expander members having composite properties enhancing their use on intravascular catheters, such as angioplasty catheters is described. Diverse polymeric compounds of differing properties are coextruded to create a multilayer parison (40). The parison (40) is subsequently drawn and expanded in a blow molding operation to yield an expander member exhibiting enhanced properties including lubricity, burst strength, limited radial expansion, bondability, and rupture characteristics.
Inventors
- 👤 Robert N. Hamlin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 01:30
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0043; A61M25/0045; A61L; A61L29/00; A61L29/04; A61L29/041; A61L29/06; A61L29/12; A61L29/126; A61M25/0009; A61M25/10; A61M25/1027; A61M25/1029; B; B29; B29C; B29C49/00; B29C49/02; B29C49/04; B29C49/22; A61M2025/1031; A61M2025/1043; A61M2025/1075; A61M25/1034; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/08; B29K2023/083; B29K2067/00; B29L; B29L2031/00; B29L2031/753; B29L2031/7542; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/1397
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
An expander member for attachment to a medical catheter comprising: (a) an outer biaxially-oriented tubular polymeric film layer (40) exhibiting relatively high polymer crystallinity; and (b) an inner polymeric plastic film layer (48) adhered to said outer layer (40) and exhibiting relatively low polymer crystallinity.
Claim 2
Dependent Claim
45 words
An expander member for attachment to a medical catheter comprising: (a) an outer biaxially-oriented tubular polymeric film layer (40) exhibiting relatively high polymer crystallinity; and (b) an inner polymeric plastic film layer (48) adhered to said outer layer (40) and exhibiting relatively low polymer crystallinity.
Claim 3
Dependent Claim
27 words
The expander member of Claim 1 wherein said outer film layer (40) comprises polyethylene terephthalate co-polyester or homopolyester exhibiting a burst pressure in excess of seven atmospheres.
Claim 4
Dependent Claim
16 words
The expander as in Claim 2 wherein said inner film layer (48) comprises an amorphous polyester.
Claim 5
Dependent Claim
14 words
The expander as in Claim 2 wherein said inner layer (48) comprises a polyolefin.
Claim 6
Dependent Claim
23 words
The expander as in Claim 4 and further including a hot-melt adhesive disposed between said outer layer (40) and said inner layer (48).
Claim 7
Dependent Claim
17 words
The expander as in Claim 1 wherein said outer layer (40) is coated with a hydrophilic polymer.
Claim 8
Dependent Claim
12 words
The expander as in Claim 6 wherein said hydrophilic polymer is polycaprolatom.
Claim 9
Dependent Claim
99 words
Process for forming an expander member for attachment to an intravascular catheter body member comprising the steps of: (a) co-extruding a polyester plastic exhibiting high polymer crystallinity with a polymeric material exhibiting low polymer crystallinity to form a layered tubular parison with said polymeric material exhibiting low polymer crystallinity on the interior of said tubular parison; (b) heating said parison in a mold to a predetermined temperature; (c) drawing said parison longitudinally and radially expanding same to biaxially orient said polyester exhibiting high polymer crystallinity such that said expander member exhibits a burst strength greater than about seven atmospheres.
Claim 10
Dependent Claim
99 words
Process for forming an expander member for attachment to an intravascular catheter body member comprising the steps of: (a) co-extruding a polyester plastic exhibiting high polymer crystallinity with a polymeric material exhibiting low polymer crystallinity to form a layered tubular parison with said polymeric material exhibiting low polymer crystallinity on the interior of said tubular parison; (b) heating said parison in a mold to a predetermined temperature; (c) drawing said parison longitudinally and radially expanding same to biaxially orient said polyester exhibiting high polymer crystallinity such that said expander member exhibits a burst strength greater than about seven atmospheres.
Claim 11
Dependent Claim
29 words
The method as in Claim 8 wherein said polyester plastic is polyethylene terephthalate and said polymeric material is selected from the class including polyethylene, urethane and amorphous polyethylene terephthalate.
Claim 12
Dependent Claim
21 words
The method as in Claim 8 and further including the steps of: (d) coating said expander member with a hydrophilic plastic.
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