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EP0323144A2
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EP
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Method of manufacturing at least single-layer tubular blood vessel endoprosthesis, especially of a small internal diameter, and extruding nozzle for carrying out this method
Assignee: VYZKUMNY USTAV POTRAVINARSKEHO PRUMYSLU
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Filing: 1988-12-22
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Granted: —
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Expires: 2008-12-22
Abstract
Abstract The method comprises a first phase wherein a thermoplastic biological material is extruded through an axial passage in a nozzle onto a core which is capable to reduce its profile if exposed to an axial tension whereby a homogeneous uniform layer of said material is created on said core, further a second phase wherein the layer of biological material is hardened and dried on said core, or, optionally, to the hardenen and dried layer at least another layer is applied and fixed thereon, and, finally, a third phase wherein the layer of biological material, or a laminate, respectively, contracts and becomes loose on the core by axially tensioning the latter so that the tubular layer can be easily removed therefrom.
Inventors
- 👤 Vlastimil Cermak
- 👤 Milan Krajicek
- 👤 Ivan Janovec
- 👤 Miloslav Adam
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/44; B29C33/48; B29C33/50; B29C33/505; A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/062; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/15; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/34; B29C48/88; B29C48/919; B29L; B29L2031/00; B29L2031/753; B29L2031/7532; B29L2031/7534
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A method of manufacturing at least single-layer tubular blood vessel endoprosthesis, especially of a small internal diameter, on the basis of an absorbable biological material, the method being characterized in that it comprises a first phase wherein a thermoplastic biological material is extruded through an axial passage in a nozzle onto a core which is capable to reduce its profile if exposed to an axial tension/ whereby a homogeneous uniform layer of said material is created on said core, further a second phase wherein the layer of biological material is hardened and dried on said core, or, optionally, to the hardened and dried layer at least one other layer is applied and fixed thereon, and, finally, a third phase wherein the layer of biological material, or a laminate, respectively, becomes loose on the core by axially tensioning the latter so that the tubular layer can be easily removed therefrom.
Claim 2
Independent Claim
149 words
A method of manufacturing at least single-layer tubular blood vessel endoprosthesis, especially of a small internal diameter, on the basis of an absorbable biological material, the method being characterized in that it comprises a first phase wherein a thermoplastic biological material is extruded through an axial passage in a nozzle onto a core which is capable to reduce its profile if exposed to an axial tension/ whereby a homogeneous uniform layer of said material is created on said core, further a second phase wherein the layer of biological material is hardened and dried on said core, or, optionally, to the hardened and dried layer at least one other layer is applied and fixed thereon, and, finally, a third phase wherein the layer of biological material, or a laminate, respectively, becomes loose on the core by axially tensioning the latter so that the tubular layer can be easily removed therefrom.
Claim 3
Dependent Claim
38 words
A method according to claim 1, characterized in that to the layer of biological material hardened and dried on the core a non-absorbable layer is applied and then fixed thereon by means of another layer of biological material.
Claim 4
Dependent Claim
30 words
A method according to claim 1, characterized in that the surface of the layer of biological material, or of the laminate, respectively, on the core is plastified by chemical means.
Claim 5
Dependent Claim
71 words
A method according to claim 1, characterized in that the thermoplastic biological material, when forced under pressure through the extruding nozzle, is shaped into the form of streams which are extruded through the cavity of the actual rotating extruding nozzle into its output portion and deposited, after leaving it, onto the core which is axially moved and rotated in the direction corresponding to the rotation of the actual rotating extruding nozzle.
Claim 6
Dependent Claim
24 words
A method according to claim 1, characterized in that the first and the second phase are effected on a core reinforced by a rod.
Claim 7
Dependent Claim
191 words
An extruding nozzle for carrying out the method according to claims 1 through 4, characterized in that it comprises a head (1-) with a radial cavity (2) communicating with a pressurized supply pipe (3) for supplying the thermoplastic biological material, a guiding tube (8) for a core (23), the tube (8) being axially secured in said head (1), a hub (10) which is fixedly attached to the head (1) and in which an actual extruding nozzle (13) is mounted for rotation, the nozzle (13) being provided at its outer end with a pulley (15), further a distributor (16) immovably disposed between the head (1) and the hub (10) and provided, on the one hand, with an axial opening (17) in which the guiding tube (8) is secured, and, on the other hand, with a system of holes (18) which extend in parallel to said guiding tube (8), merge into said radial cavity (2) of said head (1) and open into the cavity of the actual rotating extruding nozzle (13), said guiding tube (8), which passes through said cavity of the actual rotating extruding nozzle (13), terminating in the nozzle output (22).
Claim 8
Dependent Claim
25 words
An extruding nozzle according to claim 6, characterized in that the core (23) is provided with an axial bore (25) for a removable rod (26).
References Cited (Backward Citations)
No citation records indexed.
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