Method for fabrication of an implantable hermetic transparent container

A method of fabrication of an implantable, hermetic transparent container for electronic circuitry, comprising:

• selecting a circular cylindrical tube of transparent material having a proximal end, a distal end, and a circular lumen from said proximal end to said distal end, and having a melting point sufficiently high to permit brazing thereto;
• selecting a metal proximal weld collar having a proximal end, a distal end, and a circular lumen extending from said proximal end to said distal end, the proximal end of the lumen of said weld collar having a first diameter at the proximal end of said weld collar and having a circumferential indentation in the distal end surface of said weld collar, said circumferential indentation corresponding to the proximal end of-said tube;
• selecting a metal distal weld collar having a proximal end, a distal end and a circular lumen extending from said proximal end to said distal end, the lumen of said weld collar having a second diameter at the distal end of said weld collar and a circumferential indentation in the proximal end surface of said weld collar, said circumferential indentation corresponding to the distal end of said tube;
• selecting a metal body having a proximal end and a distal end and having electronic circuitry attached thereto intermediate said proximal and distal ends of said body, said proximal end of said body having a circular cross section of said first diameter and said distal end of said body having a circular cross section of said second diameter, the length of said body exceeding the length of said tube;
• inserting the proximal end of said tube into the circular indentation rn the distal end of said proximal weld collar and inserting the distal end of said tube into the indentation at the proximal end of said distal weld collar;
• brazing said proximal and distal weld collars to said tube;
• after said brazing step, sliding said sapphire tube and said weld collars over said body such that the proximal end of said body extends proximal to the proximal end of said proximal weld collar and such that the distal end of said body extends distally to the distal end of said distal weld collar;
• and
• after said sliding step, welding the distal end of said distal weld collar to the distal end of said body and said proximal end of said proximal weld collar to the proximal end of said body.