GB2189150A
Expired / Lapsed
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Prosthesis and process for its manufacture
Assignee: Medinvent SA
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Filing: 1987-04-16
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Granted: —
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Expires: 2007-04-16
Abstract
No abstract record available.
Inventors
- 👤 Hans Ivar Wallsten
- 👤 Christian Imbert
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-22 19:46
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61F2/02; A61F2/04; A61F2/06; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/045; D; D04; D04C; D04C1/00; D04C1/06; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029; D10; D10B; D10B2401/00; D10B2401/04; D10B2401/046; D10B2509/00; D10B2509/06
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
188 words
A resilient, elastic self-expanding prosthesis comprising a flexible tubular body, the dia meter of which is variable under axial movement of the ends of the body relative to each other, 5 said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, character- 10 ized in that the residual tension of the threaded elements as they form the structural elements of the tubular body, at least at the end sections thereof, is such that the diameter of the unloaded helix-shaped thread element, at least at the end sections thereof, when removed from the other elements forming the tubular body is not more than about 60% and preferably at most about 30% greater than the diameter of the said body in an unloaded state. 15
Claim 2
Dependent Claim
188 words
A resilient, elastic self-expanding prosthesis comprising a flexible tubular body, the dia meter of which is variable under axial movement of the ends of the body relative to each other, 5 said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, character- 10 ized in that the residual tension of the threaded elements as they form the structural elements of the tubular body, at least at the end sections thereof, is such that the diameter of the unloaded helix-shaped thread element, at least at the end sections thereof, when removed from the other elements forming the tubular body is not more than about 60% and preferably at most about 30% greater than the diameter of the said body in an unloaded state. 15
Claim 3
Dependent Claim
60 words
A prosthesis according to claim 1, characterized in that the thread elements are made of a medicinally acceptable material having an energy storage capacity oY2 - 20 E of at least about 5 N/MM2, preferably at least about 12 n/MM2 and a modulus of elasticity E (Young) which is at least about 100.000 N/MM2, preferably at least about 150.000 N/MM2.
Claim 4
Dependent Claim
34 words
A prosthesis according to claim 1 or 2, characterized in that at least one of the thread 25 elements at each crossing point thereof is deformed so as to embrace the other thread element.
Claim 5
Dependent Claim
36 words
A prosthesis according to claim 3, wherein at least the outer thread element at each crossing point is deformed by being bent over the inner thread element at the area of contact between the two elements.
Claim 6
Dependent Claim
54 words
A prosthesis according to any preceding claim, wherein each thread element extends 30 alternatingly radially outwardly and radially inwardly of the crossing thread elements at the respective crossing points, the number of thread elements of one direction of winding being the same as the number of thread elements of the other direction of winding.
Claim 7
Dependent Claim
18 words
A prosthesis according to claim 3, wherein both thread elements at each crossing point are oppositely deformed. 35
Claim 8
Dependent Claim
25 words
A prosthesis according to claim 6, wherein the deformation is constituted by flattening of the juxtaposed surfaces of crossing thread elements at the crossing point.
Claim 9
Dependent Claim
19 words
A prosthesis according to any preceding claim, characterized in that the thread elements are made of a metallic material.
Claim 10
Dependent Claim
19 words
A prosthesis according to claim 8, wherein the thread elements are made from an 40 austenitic strain hardening alloy.
Claim 11
Dependent Claim
18 words
A prosthesis according to claim 9, wherein said alloy is further hardenable by heating at a moderate temperature.
Claim 12
Dependent Claim
25 words
A prosthesis according to claim 9 or 10, wherein said alloy is mainly based on cobalt chromium, nickel and molybdenum, the balance being iron. 45
Claim 13
Dependent Claim
27 words
A prosthesis according to claim 11, wherein said alloy contains about 40% cobalt, about 20% chromium, about 16% nickel and about 7% molybdenum (percentages are be weight).
Claim 14
Dependent Claim
27 words
A prosthesis according to any preceding claim, wherein the axially directed angle () between crossing elements is greater than about 90' and preferably greater than about 10T.
Claim 15
Dependent Claim
41 words
A prosthesis according to any preceding claim, characterized in that the body at the ends 50 thereof in an unloaded condition is conically widening, for example up to a diameter which is about 20% greater than the diameter of the body.
Claim 16
Dependent Claim
31 words
A prosthesis according to any preceding claim, wherein the body (53) at least at one end thereof is designed with diminishing diameter so as to act as a filter when applied.
Claim 17
Dependent Claim
26 words
A prosthesis according to any preceding claim, comprising interspersed or cobraided 55 therein extra filaments or porous material to provide for desired porosity of the prosthesis.
Claim 18
Independent Claim
150 words
A method of preparing a resilient, self-expanding prosthesis comprising a flexible tubular body, the diameter of which is variable by axial movement of the ends of the body relative to each other, said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line 60 of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, characterized by braiding in a braiding machine known per se the tubular body while applying such tension to each individual thread element as to permanently deform and brake same over 65 12 GB2189150A 12 the underlying thread element at the crossing point.
Claim 19
Independent Claim
150 words
A method of preparing a resilient, self-expanding prosthesis comprising a flexible tubular body, the diameter of which is variable by axial movement of the ends of the body relative to each other, said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line 60 of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, characterized by braiding in a braiding machine known per se the tubular body while applying such tension to each individual thread element as to permanently deform and brake same over 65 12 GB2189150A 12 the underlying thread element at the crossing point.
Claim 20
Dependent Claim
65 words
A method according to claim 17, characterized in that the manufacture of the prosthesis is performed using thread elements made of a medicinally acceptable material having an energy storage capacity 5 aY2 of at least about 5 N/MM2, preferably at least about 12 N/MM2 and a modulus of elasticity E 10 (Young) which is at least about 100.000 N/mM2, preferably at least about 150.000 N/MM2.
Claim 21
Dependent Claim
31 words
A method according to claim 17 or 18, wherein the tension applied to each thread element is at least about 20% of the yield strength of the material of said element.
Claim 22
Independent Claim
169 words
A method of preparing a resilient, self-expanding prosthesis comprising a flexible tubular body, the diameter of which is variable by axial movement of the ends of the body relative to 15 each other, said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, 20 characterized by subjecting such body after its initial manufacture, such as by braiding, to mechanical deformation so that at least one of the thread elements at each crossing point thereof will at least partly embrace the other thread element to prevent sliding movement between crossing threads but permit relative rotatory motion between the thread elements at said crossing point. 25
Claim 23
Independent Claim
169 words
A method of preparing a resilient, self-expanding prosthesis comprising a flexible tubular body, the diameter of which is variable by axial movement of the ends of the body relative to 15 each other, said body being composed of several individual rigid but resiliently flexible thread elements with spring properties each of which extends in helix configuration with the centre line of the body as a common axis, a number of elements having same direction of winding but being axially displaced relative to each other crossing a number of elements also axially displaced relative to each other but having the opposite direction of winding to form a braided structure, 20 characterized by subjecting such body after its initial manufacture, such as by braiding, to mechanical deformation so that at least one of the thread elements at each crossing point thereof will at least partly embrace the other thread element to prevent sliding movement between crossing threads but permit relative rotatory motion between the thread elements at said crossing point. 25
Claim 24
Dependent Claim
20 words
A method according to claim 20, wherein the mechanical deformation is provided by hammering, mechanical or isostatic pressing or blasting.
Claim 25
Independent Claim
40 words
A method according to any of claims 17 to 21, wherein the tubular body is made from a metal alloy and is finally heat treated at an increased temperature for the purpose of releasing tension in the braided structure. 30
Claim 26
Dependent Claim
30 words
A method according to claim 22, wherein the tubular body is made from an austenitic strain hardening alloy which is finally hardened by heat treatment at a moderately increased temperature.
Claim 27
Dependent Claim
23 words
A method according to claim 23, wherein the heat treatment takes place at a tempera- ture within the range of about 400-600T. 35
Claim 28
Independent Claim
50 words
A method for manufacturing a prosthesis according to any of claims 8 to 12, character ized by braiding the tubular body in a braiding machine known per se, and then reducing the residual tension of the thread elements of the body by heating to provide for fixation of its shape.
Claim 29
Dependent Claim
15 words
A prosthesis manufactured by the method according to any of claims 17 to 25. 40
Claim 30
Dependent Claim
27 words
A resilient, elastic self-expanding prosthesis substantially as hereinbefore described with reference to, and as illustrated in, any one of Figs. 2 to 11 of the accompanying drawings.
Claim 31
Dependent Claim
27 words
A resilient, elastic self-expanding prosthesis substantially as hereinbefore described with reference to, and as illustrated in, any one of Figs. 2 to 11 of the accompanying drawings.
Claim 32
Independent Claim
53 words
A method of manufacturing a prosthesis substantially as hereinbefore described with reference to any of Figs. 2 to 11. Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd, Dd 899 1685, 1987. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 'I AY, from which copies may be obtained.
Claim 33
Independent Claim
53 words
A method of manufacturing a prosthesis substantially as hereinbefore described with reference to any of Figs. 2 to 11. Printed for Her Majesty's Stationery Office by Burgess & Son (Abingdon) Ltd, Dd 899 1685, 1987. Published at The Patent Office, 25 Southampton Buildings, London, WC2A 'I AY, from which copies may be obtained.
References Cited (Backward Citations)
WO1983003752A1
Cited
GB2135585A
Cited
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