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Search Publications by: John A. Tesk (Assoc)

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Displaying 1 - 21 of 21

Medical Implant Information, Performance, and Policies Workshop

October 12, 2021
Author(s)
A A. Ciarkowski, G Devey, H Heffernan, C A. Kelley, B Liebler, W F. Regnault, W L. Shinowara, M D. Sourwine, John A. Tesk, J R. Watson
The BMIS Coordinating Committee organized a workshop on September 19 and 20, 2002, in Gaithersburg, MD, to evaluate the role of the Federal Government in extracting and disseminating information gained from explanted medical implants to provide information

Wear Analysis of UHMWPE Using a Load Sum Method

October 12, 2021
Author(s)
M C. Shen, Stephen M. Hsu, John A. Tesk, A Christou
An accelerated wear test pro-cedure has been developed for wear screening of ultra-high molecular weight polyethylene (UHMWPE) using a new wear tester. Results showed that the test procedure was able to discriminate known wear level samples within seven

Standards for Biomaterials

February 19, 2017
Author(s)
Stephen W. Freiman, John A. Tesk
This paper is a summary of a workshop session during the Workshop on Biomedical Materials and Devices, held June 13-14, 2001. The workshop is part of a series of workshops and topical meetings organized by NIST in the area of biomedical technology. The

Report From NIST to The Medical Devices Standards Board, July 15, 2004

October 16, 2008
Author(s)
John A. Tesk
Polymers Division Activities of interest to the Medical Devices Standards Board are summarized: The status of ASTM Task Force F04.42.06, Development of Reference Scaffolds for Tissue Engineering and the availability if the report on the NIBIB, NIST and FDA

Report to The Medical Devices Standards Board

October 16, 2008
Author(s)
John A. Tesk
News of recent NIST standards-related activities are presented for information to the Medical Devices Standards Board. These include the release of reference material 8457 for measurements of crosslinking of Ultra High Molecular Weight Polyethylene (UHMWPE

Symposium on Cleanliness of Biomedical Devices

October 16, 2008
Author(s)
John A. Tesk
An outline of the kinds of papers appropriate for an ASTM Symposium on Cleanliness of Medical Implants, May 2005 is presented, with example of the topical areas of interest. Organizations from which papers are sought include:The U.S. Food and drug

Permeability of Polymeric Scaffolds With Defined Pore Micro-Architecture and Interconnectivity Fabricated by Solid Free-Form Microprinting

November 7, 2004
Author(s)
K W. Lee, E Jabbari, L L. Lu, B L. Currier, Joy Dunkers, Martin Chiang, John A. Tesk, Marcus T. Cicerone, M J. Yaszemski
The hydraulic permeability of was measured as a function of interconnectivity of the pores. The hydraulic permeability of porous scaffolds for tissue engineering of bone was measured as interconnectivity of the pores was changed from 100 % to 70 %. The

High-Temperature Investments

January 1, 2002
Author(s)
O Okuno, K Asaoka, John A. Tesk
Dental investing materials, used for the processing of dental materials above temperatures of ca. 1200 degrees C to 1300 degrees C, are described. Their compositions and the effects of different ingredients are presented.

Effects of Annealing on UHMWPE Molecular Orientation

January 1, 2000
Author(s)
S Sambasvian, Daniel A. Fischer, M C. Shen, John A. Tesk, Stephen M. Hsu
Ultra-high molecular weight polyethylene (UHMWPE) is the dominant material used in artificial joints due to its outstanding wear resistance. At the same time, UHMWPE wear debris has been found to contribute to the loosening of the im-plants. As life

A Novel Multiaxial Wear Tester for Accelerated Testing of Materials

December 1, 1999
Author(s)
M C. Shen, Stephen M. Hsu, John A. Tesk, A Christou
A versatile wear tester has been designed and built. The initial study showed that that with this tester, tes procedures can be developed to achieve clinically relevant simulations in a short time. With the continuously monitored force traces, this tester

Generation of Different UHMWPE Particle Shape by Wear Through Surface Texturing

April 1, 1999
Author(s)
H. W. Fang, M C. Shen, U Cho, John A. Tesk, A Christou, Stephen M. Hsu
Ultra-high molecular weight polyethylene (UHMWPE) wear particles in replaced joints have been linked to biochemical reactions that eventually lead to loosening of prosthesis. Several studies have shown that UHMWPE produces a wide range of particle sizes

Amorphous Alloys Containing Cobalt for Orthopaedic Applications

November 1, 1998
Author(s)
John A. Tesk, C E. Johnson, Drago Skrtic, Ming S. Tung, Stephen M. Hsu
Amorphous metal alloys have properties and structures unlike those of theircrystalline counterparts. For example, a multiphase crystalline structure may exhibit poor corrosion resistance while the amorphous structure is corrosion resistant. The high