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In general, the disclosure is directed toward transmitting radiant energy across a boundary of a medical device via an optical feedthrough. A system for transmitting radiant energy across a boundary of a medical device includes a first functional module of a medical device, a second functional modul

In general, the disclosure is directed toward transmitting radiant energy across a boundary of a medical device via an optical feedthrough. A system for transmitting radiant energy across a boundary of a medical device includes a first functional module of a medical device, a second functional module of the medical device, an optical feedthrough assembly coupled to the first functional module, and a radiant energy source that emits a beam through the optical feedthrough assembly to perform a manufacturing process on the first functional module and the second functional module.

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1. A system comprising: a first functional module of a medical device;a second functional module of the medical device;an optical feedthrough assembly different than the first functional module and coupled to the first functional module; anda radiant energy source that emits a beam through the optic

1. A system comprising: a first functional module of a medical device;a second functional module of the medical device;an optical feedthrough assembly different than the first functional module and coupled to the first functional module; anda radiant energy source that emits a beam through the optical feedthrough assembly to perform a manufacturing process on the first functional module and the second functional module. 2. The system of claim 1, wherein the first functional module comprises a shell that encloses components within the first functional module, wherein the optical feedthrough assembly is coupled to the shell of the first functional module. 3. The system of claim 1, wherein the second functional module comprises a fitting that mates with an aperture defined by the first functional module. 4. The system of claim 1, wherein the second functional module comprises a shell that encloses components within the second functional module. 5. The system of claim 1, wherein the medical device comprises an implantable medical device. 6. The system of claim 1, wherein the medical device comprises a therapeutic agent delivery device. 7. The system of claim 1, wherein the optical feedthrough assembly comprises an optical window that allows the beam through the optical feedthrough assembly, wherein the optical window is at least one of transparent or translucent to light of the beam. 8. The system of claim 1, wherein the manufacturing process comprises at least one of coupling the first functional module and the second functional module, detaching the first functional module and the second function module, and creating a fluid path between the first functional module and the second functional module. 9. The system of claim 2, wherein an interface between the shell and the optical feedthrough assembly is hermetically sealed. 10. The system of claim 2, wherein the shell provides a hermetic housing for the first functional module. 11. The system of claim 2, wherein the components enclosed in the shell are sterile. 12. The system of claim 4, wherein the shell provides a hermetic housing for the second functional module. 13. The system of claim 4, wherein the components enclosed in the shell are sterile. 14. The system of claim 6, wherein the first functional module comprises a catheter access port. 15. The system of claim 7, wherein the optical window comprises at least one of glass, sapphire, polymer, or a crystalline material. 16. The system of claim 8, wherein the first functional module, second functional module, and optical feedthrough assembly are all configured to allow the radiant energy source to emit the beam through the optical feedthrough assembly to couple the first functional module and the second functional module and create a fluid path between the first functional module and the second functional module. 17. A method comprising: assembling a first functional module of a medical device;assembling a second functional module of the medical device;coupling an optical feedthrough assembly to the first functional module, wherein the optical feedthrough assembly is different than the first functional module; andapplying radiant energy through the optical feedthrough assembly to perform a manufacturing process on the first functional module and the second functional module. 18. The method of claim 17, wherein coupling the optical feedthrough assembly to the first functional module comprises welding the optical feedthrough assembly to the first functional module. 19. The method of claim 17, wherein applying radiant energy through the optical feedthrough assembly to perform a manufacturing process on the first functional module and the second functional module comprises coupling the first functional module and the second functional module by welding the first functional module to the second functional module. 20. The method of claim 17, wherein the second functional module comprises a shell that encloses components within the second functional module, further comprising sterilizing the components enclosed in the shell. 21. The method of claim 17, further comprising hermetically sealing the second functional module. 22. The method of claim 17, wherein the performing the manufacturing process comprises at least one of coupling the first functional module and the second functional module, detaching the first functional module and the second function module, and creating a fluid path between the first functional module and the second functional module. 23. The method of claim 18, wherein coupling the optical feedthrough assembly to the first functional module comprises coupling the optical feedthrough assembly to a shell of the first functional module that encloses components within the first functional module. 24. The method of claim 23, wherein coupling the optical feedthrough assembly to the shell of the first functional module comprises hermetically sealing an interface between the shell and the optical feedthrough assembly. 25. The method of claim 23, further comprising sterilizing the components enclosed in the shell. 26. The method of claim 19, further comprising applying radiant energy through the optical feedthrough assembly to create a fluid path between the first functional module and the second functional module. 27. A system comprising: a first functional module of a medical device;a second functional module of the medical device;means for optically transmitting radiant energy to at least one of the first functional module and the second functional module, wherein the means for optically transmitting radiant energy is different than the first functional module; andmeans for applying radiant energy through the means for optically transmitting radiant energy to perform a manufacturing process on the first functional module and the second functional module. 28. The system of claim 8, wherein the manufacturing process comprises at least one of coupling the first functional module and the second functional module, detaching the first functional module and the second function module, and creating a fluid path between the first functional module and the second functional module.