Device and method for needle penetrating and filling a chamber with a predetermined substance, and hermetically resealing a resulting needle hole in the device by applying radiation thereto. The needle penetrable and resealable portion defines a predetermined wall thickness in an axial direction thereof, and may include a thermoplastic that substantially prevents the formation of particles released into the chamber from the needle penetrable and resealable portion during penetration by and withdrawal of the needle. Such thermoplastic may include a predetermined amount of pigment that allows the thermoplastic to substantially absorb laser radiation at a predetermined wavelength, substantially prevent the passage of radiation through the predetermined wall thickness thereof, and hermetically seal a needle aperture formed in the needle penetration region thereof in a predetermined time period.

A method for forming a weld between two thermoplastic materials includes contacting a laser to a precursor thermoplastic assembly including a thermoplastic plate and a thermoplastic sheet in direct contact with a first surface of the thermoplastic plate to cause localized melting at an interface between the first thermoplastic material layer and the second thermoplastic material layer, where the first and second thermoplastic material layers are opaque to the laser. The laser has a speed greater than or equal to about 0.05 m/s to less than or equal to about 0.2 m/s, a power greater than or equal to about 14 W to less than or equal to about 43 W, and a density greater than or equal to about 9,800 pulses per meter to less than or equal to about 29,600 pulses per meter.