Darrell W Smith

US Patent:

58418300, Nov 24, 1998

Filed:

Feb 19, 1997

Appl. No.:

8/802618

Inventors:

John J. Barni - Mayfield Village OH
Kenneth L. Freeman - Stow OH
Gary A. Kaufmann - Hinckley OH
Darrell M. Smith - Cleveland Heights OH

Assignee:

Picker International, Inc. - Highland Heights OH

International Classification:

A61B 603

US Classification:

378 15

Abstract:

A radiation source which generates a radiation cone-beam (14) and a two-dimensional radiation detector are spiralled continuously around and longitudinally relative to an imaging volume. Image data from the two-dimensional display is reconstructed (30. sub. 1, 30. sub. 2,. . . 30. sub. n) into a volumetric, physiological image stored in a subject memory (32). During an interventional surgical procedure with a surgical instrument (42), the x-ray source is gated to operate intermittently, e. g. , at 60. degree. angular intervals, at a reduced radiation intensity by an x-ray tube control (40). The additional data is reconstructed into a three-dimensional image representation of the surgical instrument and stored in an instrument memory (34). An operator image selection processor (60) causes data retrieval circuits (62a, 62b) to retrieve like slices or other image representations from the subject and instrument memories. The retrieved data is combined (64) such that a resultant human-readable display (68) shows the instrument superimposed on the anatomical image.

US Patent:

50098420, Apr 23, 1991

Filed:

Jun 8, 1990

Appl. No.:

7/535379

Inventors:

Alfred A. Hendrickson - Lake Leelanau MI
Darrell W. Smith - Chassell MI

Assignee:

Board of Control of Michigan Technological University - Houghton MI

International Classification:

B22F 324

US Classification:

419 28

Abstract:

High strength steel parts or articles are made from a powder alloy by compacting the powder into a preform, sintering the preform in a sintering furnace or the like under a highly-reducing atmosphere and at a temperature of at least 1150. degree. C. , cooling the preform, preheating the sintered preform in a highly-reducing atmosphere, such as an inert gas-based atmosphere containing hydrogen or pure hydrogen, to a temperature of at least 1000. degree. C. and transferring the preheated preform to an impact forging device and impacting the preform at a peak averaging forging pressure of at least about 1000 MPa to obtain a forged part or article. The time period between removal of the preheated preform from the preheater and the first forging impact is no more than about 8 seconds. The sintering and preheating steps can be combined with the sintered preform being cooled to the preheating temperature in the sintering furnace and transferred directly from the sintering furnace to the impact forging device.