Patent EP0009941A1 successfully refreshed from Google Patents.
EP0009941A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Production of electrostatically spun products
Assignee: University of Liverpool
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Filing: 1979-09-28
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Granted: —
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Expires: 1999-09-28
Abstract
Abstract Preparation of products having a tubular portion (8) comprising electrostatically spinning a fibreizable liquid, the electrostatic field being distorted by the presence of an auxiliary electrode (6), preferably so as to encourage the deposition of circumferential fibres.
Inventors
- 👤 Alan Bornat
- 👤 Roy Malcolm Clarke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 14:03
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/0007; D01D5/0061; D01D5/0092; A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; D04; D04H; D04H1/00; D04H1/70; D04H1/72; D04H1/728; D04H1/76
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
72 words
A process for the preparation of a product comprising a tubular portion which process comprising introducing into an electrostatic field a liquid comprising ` a fibreizable material, whereby the material is caused to produce fibres which tend to be drawn to a collector charged relative to said fibres and upon which they are deposited to form said portion, said electrostatic field being distorted by the presence of at least one auxiliary electrode.
Claim 2
Dependent Claim
72 words
A process for the preparation of a product comprising a tubular portion which process comprising introducing into an electrostatic field a liquid comprising ` a fibreizable material, whereby the material is caused to produce fibres which tend to be drawn to a collector charged relative to said fibres and upon which they are deposited to form said portion, said electrostatic field being distorted by the presence of at least one auxiliary electrode.
Claim 3
Dependent Claim
14 words
A process according to claim 1 in which the collector is of cylindrical shape.
Claim 4
Dependent Claim
15 words
A process according to claim 1 or 2 in which the product is a tube.
Claim 5
Dependent Claim
39 words
A process according to claim 1 in which at least one auxiliary electrode is located so that the collector is positioned substantially between said auxiliary electrode and the point at which the liquid is introduced into the electrostatic field.
Claim 6
Dependent Claim
22 words
A process according to claim 1 in which the auxiliary electrode carries a charge of the same sign as does the collector.
Claim 7
Dependent Claim
19 words
A process according to claim 1 in which the auxiliary electrode carries a-charge smaller than that on the collector.
Claim 8
Dependent Claim
25 words
A process according to claim 6 in which the auxiliary electrode carries a charge between 2 and 8 KV less than that on the collector.
Claim 9
Dependent Claim
39 words
A process according to claim 1 in which the distortion of the electrostatic field is such that the relative disposition of the deposited fibres upon the collector is altered from that obtained in the absence of the auxiliary electrode.
Claim 10
Dependent Claim
40 words
A process according to claim 8 in which the auxiliary electrode is so positioned and charged that the proportion of fibres deposited in substantially circumferential disposition is increased relative to those so deposited in the absence of said auxiliary electrode.
Claim 11
Dependent Claim
30 words
A process according to claim 1 in which the disposition of fibres deposited upon the collector is such that upon removal of the collector the tubular portion reduces in diameter.
Claim 12
Dependent Claim
17 words
A process according to claim lO in which the reduction in internal diameter is greater than 10%.
Claim 13
Dependent Claim
17 words
A process according to claim 10 in which the reduction in diameter is between 10 and 25%.
Claim 14
Dependent Claim
17 words
A process according to claim 10 in which the reduction in diameter is between 25 and 40%.
Claim 15
Dependent Claim
35 words
A product comprising a tubular portion comprising fibres, said tubular portion having been formed upon a former and said fibres being so disposed that upon removal of the former the tubular portion reduces in diameter.
Claim 16
Dependent Claim
35 words
A product comprising a tubular portion comprising fibres, said tubular portion having been formed upon a former and said fibres being so disposed that upon removal of the former the tubular portion reduces in diameter.
Claim 17
Dependent Claim
33 words
A product comprising a tubular portion comprising both longitudinally and circumferentially disposed fibres, the disposition of said fibres being such that not more than 25% of them lie predominantly in any one direction.
Claim 18
Dependent Claim
33 words
A product comprising a tubular portion comprising both longitudinally and circumferentially disposed fibres, the disposition of said fibres being such that not more than 25% of them lie predominantly in any one direction.
Claim 19
Dependent Claim
34 words
A product comprising a tubular portion, said tubular portion comprising fibres deposited upon a charged collector, the field around said charged collector having been distorted by the presence of at least one auxiliary electrode.
Claim 20
Dependent Claim
34 words
A product comprising a tubular portion, said tubular portion comprising fibres deposited upon a charged collector, the field around said charged collector having been distorted by the presence of at least one auxiliary electrode.
Claim 21
Dependent Claim
29 words
A product according to claim 16 in which the fibre disposition in the product is different from that which - is obtained in the absence of the auxiliary electrode.
Claim 22
Dependent Claim
25 words
A product according to claim 17 comprising a proportion of substantially circumferentially disposed fibres higher than that obtained in the absence of the auxiliary electrode.
Claim 23
Dependent Claim
59 words
A tube of internal diameter of between 1 and 30 mm comprising a plurality of fibres of diameter 0.1 to 25 mp, at least a proportion of said fibres lying longitudinally to the long axis of the tube and at least a proportion lying circumferentially, and not more than 25% of said fibres lying predominantly in any one direction.
Claim 24
Dependent Claim
59 words
A tube of internal diameter of between 1 and 30 mm comprising a plurality of fibres of diameter 0.1 to 25 mp, at least a proportion of said fibres lying longitudinally to the long axis of the tube and at least a proportion lying circumferentially, and not more than 25% of said fibres lying predominantly in any one direction.
Claim 25
Dependent Claim
17 words
A tube of internal diameter between 1 and 30 mm obtained by the process of claim 1.
Claim 26
Dependent Claim
26 words
A tube according to claim 20 comprising fibres of polymeric material selected from the group consisting of fibre forming polyurethane, fluorinated hydrocarbons, polyester, polyamides and polyacrylonitrile.
Claim 27
Dependent Claim
14 words
A prosthetic device according to any of claims 15, 16, 19, 20 and 21.
Claim 28
Dependent Claim
34 words
A method of repairing a damaged blood vascular component which comprises excising a portion of the said vascular component and replacing said excised portion with a suitably dimensioned prosthesis device according to claim 22.
References Cited (Backward Citations)
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