Fabrication, permeation, and corrosion stability measurements of silica membranes for HI decomposition in the thermochemical iodine–sulfur process

Purpose. The purpose of this study was to determine whether intraoperative prereconstruction stability measurements and/or patient characteristics were associated with final knee stability after computer-assisted ACL reconstruction.Methods. This was a retrospective review of all patients who underwent computer-assisted single-bundle ACL reconstruction by a single surgeon. Prereconstruction intraoperative stability measurements were correlated with patient characteristics and postreconstruction stability measurements. 143 patients were included (87 male and 56 female). Average age was 29.8 years (SD ± 11.8).Results. Females were found to have significantly more pre- and postreconstruction internal rotation than males (P< 0.001 andP= 0.001, resp.). Patients with additional intra-articular injuries demonstrated more prereconstruction anterior instability than patients with isolated ACL tears (P< 0.001). After reconstruction, these patients also had higher residual anterior translation (P= 0.01). Among all patients with ACL reconstructions, the percent of correction of anterior translation was found to be significantly higher than the percent of correction for internal or external rotation (P< 0.001).Conclusion. Anterior translation was corrected the most using a single-bundle ACL reconstruction. Females had higher pre- and postoperative internal rotation. Patients with additional injuries had greater original anterior translation and less operative correction of anterior translation compared to patients with isolated ACL tears.

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Stability measurements of PPL atmospheric pressure arc

IEEE Conference Record - Abstracts. 1997 IEEE International Conference on Plasma Science ◽

10.1109/plasma.1997.604403 ◽

2002 ◽

Author(s):

L. Roquemore ◽

S.J. Zweben ◽

G.A. Wurden

Keyword(s):

Atmospheric Pressure ◽

Stability Measurements

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Combined Corrosion and Fatigue Degradation of Nitinol Implants

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.474 ◽

2013 ◽

Vol 712-715 ◽

pp. 474-477

Author(s):

Stepan Major ◽

Stepan Hubalovsky ◽

Josef Šedivý

Keyword(s):

Stent Graft ◽

Graft Failure ◽

Chemical Etching ◽

Surface Preparation ◽

Corrosive Environment ◽

Stent Grafts ◽

Corrosion Stability ◽

Aggressive Environment ◽

Wide Range ◽

Significant Application

Nitinol is metal alloy of nickel and titanium. It has wide range of applications. The most significant application is production of self-expanding stent-grafts, which are commonly used in vascular surgery. Stent-graft manufactures are confronted with two basic requirements: stents must have an infinite life; stents must be made of the thinnest wires us possible. Stent-graft failure or device fatigue remains major concern for stent-graft manufactures and researches. The stent-grafts are mechanically loaded, and also the device is placed in very aggressive environment. The corrosion stability of Nitinol is strongly dependent on the surface preparation: grinding, polishing, chemical etching. The paper deals with fatigue degradation of stent-grafts in corrosive environment.

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