Vascular prosthesis and method in producing it
First Claim
1. A method of producing a vascular prosthesis comprising(1) mounting a tube of a biologically acceptable resinous material in relation to a laser means producing two focused beams directed to the outer surface of said tube from opposite sides thereof, whereby said tube and said laser means can move rotationally relative to each other around the longitudinal axis of said tube, and transversely relative to each other parallel to the longitudinal axis of said tube;
- (2) moving said tube rotationally relative to said laser means and simultaneously moving said tube axially relative to said laser means whereby the focus of light from said laser means traces a helical pattern on the surface of said tube;
(3) focusing pulsed beams of light from said laser on the surface of said tube during said rotation; and
(4) controlling the energy of each pulse and directing the beams to form microdepressions in the surface of said tube, the depth of which are not more than about 75% of the thickness of the wall of the tube, and wherein the microdepressions formed by the two laser beams intersect within the wall of the vascular prosthesis, thereby forming an interconnected hole which extends from one position on the external surface of the tube, and concurrently controlling the frequency of said pulses relative to the rotational and axial movement of the tube in relation to the laser beams such that the pulsed beams form a regularly spaced helical array of microdepressions in the surface of said tube.
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Accused Products
Abstract
The invention relates to a vascular prosthesis in the form of a flexible tube which can be implanted in animals or human beings, with a regular pattern of blind holes in the external surface of the tube, which are regular with regard to direction, transverse dimensions and depth and are produced by laser treatment.
The invention also relates to a method of producing such a vascular prosthesis consisting in that the holes are produced by means of pulsated laser beams along one or more helical lines, the tube being rotated and displaced axially at the same time.
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Citations
10 Claims
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1. A method of producing a vascular prosthesis comprising
(1) mounting a tube of a biologically acceptable resinous material in relation to a laser means producing two focused beams directed to the outer surface of said tube from opposite sides thereof, whereby said tube and said laser means can move rotationally relative to each other around the longitudinal axis of said tube, and transversely relative to each other parallel to the longitudinal axis of said tube; -
(2) moving said tube rotationally relative to said laser means and simultaneously moving said tube axially relative to said laser means whereby the focus of light from said laser means traces a helical pattern on the surface of said tube; (3) focusing pulsed beams of light from said laser on the surface of said tube during said rotation; and (4) controlling the energy of each pulse and directing the beams to form microdepressions in the surface of said tube, the depth of which are not more than about 75% of the thickness of the wall of the tube, and wherein the microdepressions formed by the two laser beams intersect within the wall of the vascular prosthesis, thereby forming an interconnected hole which extends from one position on the external surface of the tube, and concurrently controlling the frequency of said pulses relative to the rotational and axial movement of the tube in relation to the laser beams such that the pulsed beams form a regularly spaced helical array of microdepressions in the surface of said tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification
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Current AssigneeKjell Bockasten, Kurt Strid, Sven Erik Bergentz
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Original AssigneeAstra Meditec AB
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InventorsBockasten, Kjell, Strid, Kurt, Bergentz, Sven E.
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Primary Examiner(s)Apley, Richard J.
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Assistant Examiner(s)Isabella, David J.
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Application NumberUS06/725,153Time in Patent Office1,051 DaysField of Search3/1, 3/1.4, 128/1 R, 623/1, 623/10, 623/11, 623/16, 623/17, 219/121 LJ, 219/121 LE, 219/121 LF, 219/121 LHUS Class Current600/36CPC Class CodesA61F 2/0077 Special surfaces of prosthe...A61F 2/06 Blood vesselsB29C 2035/0838 using laserB29C 59/165 of profiled articles, e.g. ...B29L 2031/7534 Cardiovascular prothesesY10S 623/901 Method of manufacturing pro...
