Miniature x-ray tube with micro cathode

Details Miniature x-ray tube with micro cathode Miniature x-ray tube with micro cathode

2006-01-17

2006-01-17

Ho, Allen C. (Department: 2882)

X-ray or gamma ray systems or devices

Source

Electron tube

C378S064000, C378S065000, C378S119000, C378S121000, C445S028000

Reexamination Certificate

active

06987835

ABSTRACT:
A miniature x-ray tube capable of intra vascular use, has a micro cathode preferably formed by MEMS techniques. The very fine wire of the cathode filament is formed on a semiconductor base and draws a current sufficiently low that lead wires in a cathode heater circuit, passing through a probe line connected to the x-ray tube, can be very small wires, which helps maintain sufficient dielectric spacing in the high voltage circuit handled by the same probe line. In a preferred embodiment the probe line comprises a glass fiber, held at a small diameter to allow flexibility for navigating small-radius turns within the vessels. In a preferred embodiment the fiber is overcoated with a high-dielectric polymer to significantly increase the dielectric strength of the overall cable, without adding significantly to stiffness. The high voltage ground conductor is a coaxial sheath on the outside of the polymer. Exterior to the ground conductor is a further flexible layer having paths for coolant.

REFERENCES:
patent: 5090043 (1992-02-01), Parker et al.
patent: 5773921 (1998-06-01), Keesmann et al.
patent: 6134300 (2000-10-01), Trebes et al.
patent: 6438207 (2002-08-01), Chidester et al.
patent: 6661875 (2003-12-01), Greenwald et al.

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