X-ray or gamma ray systems or devices – Source – Target
Reexamination Certificate
2001-09-10
2002-11-05
Bruce, David V. (Department: 2882)
X-ray or gamma ray systems or devices
Source
Target
C378S119000, C378S121000, C378S065000, C445S028000
Reexamination Certificate
active
06477235
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed generally to a method of manufacturing an X-ray emitter and, more particularly, to a method of forming an X-ray emitter having a diamond anode and a diamond housing.
BACKGROUND OF THE INVENTION
In the medical field, doctors and scientists are striving to find less invasive ways to treat patients. By using treatments that are less intrusive to the body, doctors can greatly reduce the stress on the patient's system and exposure to infection. For example, laparoscopic techniques enable physicians to explore the interior of the body and perform surgery through a small opening in the skin. Less intrusive medical techniques are extremely beneficial when-applied to cardiovascular diseases, for example.
Cardiovascular diseases affect millions of people, frequently causing heart attacks and death. One common aspect of many cardiovascular diseases is stenosis, or the thickening of the artery or vein, which decreases blood flow through the vessels. Angioplasty procedures have been developed to reopen clogged arteries without resorting to a bypass operation. However, in a large percentage of cases, arteries become occluded again after an angioplasty procedure. This recurrent decrease of the inner diameter of the vessel is termed restenosis. Restenosis frequently requires a second angioplasty and eventual bypass surgery. Bypass surgery is very stressful on a patient, requiring the chest to be opened, and presents risks from infection, anesthesia, and heart failure. Effective methods of preventing or treating restenosis could benefit millions of people.
One treatment for restenosis that has been attempted is radiation of the vessel wall. For example, U.S. patent application Ser. No. 08/701,764, filed Aug. 22, 1996, titled “X-ray Catheter,” describes an X-ray device for insertion into a lumen of a body, capable of localized X-ray radiation. U.S. application Ser. No. 08/701,764 is hereby incorporated by reference in its entirety. There are many difficult technical issues associated with delivering localized X-ray radiation to the interior of a patient's lumen. U.S. Pat. No. 5,854,822, titled “Miniature X-ray Device Having Cold Cathode” discusses improved cathode configurations that improve the rate of electron emission and decrease the required electric field. U.S. Pat. No. 5,854,822 is incorporated herein by reference in its entirety.
There is a need for effective devices to be used to treat the interior of the body with minimal intrusion. Effective, less invasive techniques for preventing and treating stenosis and restenosis at a lumen wall are especially needed. Size improvements on an X-ray device reduce the size of the required incision, improve maneuverability, decrease the stress on the lumen, and enable the device to reach more remote locations in the patient's body. Other applications for localized X-ray radiation are numerous, such as treating the interior of the esophagus, and providing radiation to tumors. Further, numerous non-medical applications require miniature x-ray devices that operate effectively, simplify manufacturing, and minimize the required voltage. For example, investigation of very small spaces can be performed using localized x-ray radiation.
SUMMARY OF THE INVENTION
Generally, the present invention relates to an x-ray emitter and a method for manufacturing an X-ray emitter. In one embodiment of the invention, a method of fabricating an X-ray emitter includes the steps of coupling a diamond housing to a diamond anode structure. The housing may include a diamond material that has a high resistivity while the anode structure may comprise conductive diamond, in one alternative. The method may further include forming a target metal on the anode structure. In one embodiment, the target metal may have characteristic X-ray emission of at least 11 kiloelectron volts.
In another embodiment of the invention, a device for producing X-ray radiation includes a diamond housing, a cathode disposed within the housing, and a diamond anode structure, the anode structure coupled to the housing and the device arranged to enable the production of X-ray radiation. The device may include a target metal on a tip of the anode structure. The anode structure may include graphite in one alternative embodiment. The housing may further include an external metallic layer in one embodiment. Alternatively, an exterior layer of the housing may include diamond doped with boron to provide conductivity.
In yet another embodiment of the invention, a component for an X-ray emitter is described that includes a diamond housing coupled to a diamond anode structure.
The above summary of the present invention is not intended to describe each embodiment or every implementation of the present invention. The figures and the detailed description which follow more particularly exemplify these embodiments.
REFERENCES:
patent: 5982094 (1999-11-01), Niigaki et al.
patent: 6108402 (2000-08-01), Chornenky
patent: 6134300 (2000-10-01), Trebes et al.
patent: 6267866 (2001-07-01), Glesener et al.
patent: 6289079 (2001-09-01), Chornenky et al.
Chornenky Victor Ivan
Jaafar Ali
Kerslick Graham Steven
Bruce David V.
Hobden Pamela R.
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