Title:
X-RAY CATHETER WITH MINIATURE EMITTER AND FOCUSING CATHODE CUP
Document Type and Number:
WIPO Patent Application WO2003006108
Kind Code:
A3
Abstract:
A cathode for a miniature X-ray device includes an insulating shell, a cathode and an anode. The cathode includes a focusing cup formed into and end. The focusing cup can include a thin metal layer that conforms to an inner surface of the cathode. An emitting material having a low work function, such as diamond, is deposited directly onto the internal surface of the focusing cup. The anode has a flat receiving surface for collecting electrons emitted from the anode. An interior coating is applied as a circumferential belt on the interior surface of the insulating shell. The interior coating, formed of a negative secondary emission yield material, extends lengthwise in the region of the cathode to an anode gap, covering the region of the insulating shell most likely to be subject to stray electrons emitted from the cathode.
Inventors:
KERSLICK GRAHAM S
CHORNENKY VICTOR I
JAAFAR ALI
CHORNENKY VICTOR I
JAAFAR ALI
Application Number:
PCT/US2002/021572
Publication Date:
August 14, 2003
Filing Date:
July 08, 2002
Export Citation:
Assignee:
MEDTRONIC AVE INC (US)
International Classes:
A61M36/04; A61N5/10; H01J35/06; H01J35/08; H01J35/14; H01J35/16; H01J35/32; (IPC1-7): H01J35/32; H01J35/06; H01J35/14
Foreign References:
| US6134300A | 2000-10-17 | |||
| US3783323A | 1974-01-01 | |||
| US2531583A | 1950-11-28 |
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