Method of manufacture of resin film precision biomedical article

The method of manufacture of a precision article for biomedical use, such as a corneal implant glide, of the kind comprising first and second overlapping resin film members, each having a preselected thickness and a precise predetermined size and configuration, with the overlapping portions of the two resin film members corresponding in size and configuration and joined together along one or more mating edges, comprising the following steps:

• A. aligning a first resin film, having a thickness corresponding to that required for the first film member but larger in area than the first film member, in at least partially overlapping relation to a second resin film, having a thickness corresponding to that required for the second film member but larger in area than the second film member, the overlapping portions of the two films being larger in area than the overlapping portions of the resin film members of the article;
• B. constraining the two resin films to maintain areas of the two aligned films larger than the finished article in essentially flat, surface-to-surface contact, exposed from one side;
• C. directing a laser beam having a maximum cross-sectional dimension no larger than the combined thicknesses of the two resin films, to impinge upon the exposed area of the aligned, constrained films;
• and
• D. moving the laser beam relative to the exposed areas of the aligned, constrained films, along a predetermined path corresponding precisely to the size and configuration of the peripheral outline of the finished article to cut the two resin film members from the resin films and simultaneously to weld the resin film members together, in a narrow, controlled band not appreciably wider than the combined thicknesses of the two resin films, along their mating edges.