Method of laser cutting pericardial tissue for use with an implantable medical device
First Claim
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1. A method of creating an implantable medical prosthesis, comprising:
- providing a sheet of pericardium, wherein the pericardium has at least two tissue layers;
cutting a segment of tissue out of the sheet of pericardium with a laser beam;
said cutting comprising operating a laser at a power and pulse rate such that said beam welds the layers of the pericardium together along a laser cut edge;
wherein the laser is operated in a pulsed manner, supplying between about 0.005-0.5 joules of laser energy per pulse, with a laser spot size of about 0.002-0.005 inches in diameter, thereby producing a laser cut edge without significantly burning the pericardium adjacent the cut edge.
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Abstract
A method of cutting material for use in an implantable medical device employs a plotted laser cutting system. The laser cutting system is computer controlled and includes a laser combined with a motion system. The laser precisely cuts segments out of source material according to a predetermined pattern as designated by the computer. The segments are used in constructing implantable medical devices. The cutting energy of the laser is selected so that the cut edges of the segments are melted to discourage delamination or fraying, but communication of thermal energy into the segment beyond the edge is minimized to avoid damaging the segment adjacent the edge.
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Citations
9 Claims
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1. A method of creating an implantable medical prosthesis, comprising:
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providing a sheet of pericardium, wherein the pericardium has at least two tissue layers; cutting a segment of tissue out of the sheet of pericardium with a laser beam; said cutting comprising operating a laser at a power and pulse rate such that said beam welds the layers of the pericardium together along a laser cut edge; wherein the laser is operated in a pulsed manner, supplying between about 0.005-0.5 joules of laser energy per pulse, with a laser spot size of about 0.002-0.005 inches in diameter, thereby producing a laser cut edge without significantly burning the pericardium adjacent the cut edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification