Reusable flexible ureteroscope repair rate and cost may make disposable devices a better option

2021 ◽  
Vol 889 (1) ◽  
pp. 25-25
Keyword(s):  
Repair Rate ◽  
Flexible Ureteroscope

Failure Analysis of Laser Blown Metal Fuse Failures in Submicron Technology by C-AFM

2006 ◽  
Author(s):  
Liang-Feng Wen ◽  
Chien-Hui Chen ◽  
Allen Timothy Chang
Keyword(s):  
Failure Analysis ◽  
Atomic Force Microscope ◽  
Laser Cutting ◽  
Spot Size ◽  
Repair Rate ◽  
Atomic Force ◽  
Measurement Laser

Abstract This paper presents a method of using a conductive atomic force microscope (C-AFM) to characterize a submicron metal fuse that has been blown open inadequately by laser. In order to obtain a proper I-V curve measured using the C-AFM without affecting the incompletely opened fuse, the paper proposes a method of preserving the fuse by coating its surface with spin-on glass. The paper explains how differences in laser cutting machines resulted in the high failure repair rate of customer product despite equivalent energy and spot size settings. Analysis of the fuse bank circuitry on wafers helped to find the critical physical differences between a fully blown and a poorly blown fuse. By overcoming difficulties in preserving the blown fuse failure sites for C-AFM measurement, laser settings could be easily optimized to ensure proper fuse opening.

scholarly journals Minimally-invasive mitral valve repair of symmetric and asymmetric Barlow´s disease

2021 ◽  
Author(s):  
Gloria Faerber ◽  
Sophie Tkebuchava ◽  
Mahmoud Diab ◽  
Christian Schulze ◽  
Michael Bauer ◽  
...  
Keyword(s):  
Mitral Valve ◽  
Minimally Invasive ◽  
Wide Spectrum ◽  
Mitral Valve Surgery ◽  
Valve Repair ◽  
Prolapse Repair ◽  
Repair Rate ◽  
Barlow’S Disease ◽  
Increased Risk

Abstract Objectives Barlow´s disease represents a wide spectrum of mitral valve pathologies associated with regurgitation (MR), excess leaflet tissue, and prolapse. Repair strategies range from complex repairs with annuloplasty plus neochords through resection to annuloplasty-only. The latter requires symmetric prolapse patterns and central regurgitant jets. We aimed to assess repair success and durability, survival, and intraoperative outcomes with symmetric and asymmetric Barlow’s disease. Methods Between 09/10 and 03/20, 103 patients (of 1939 with mitral valve surgery) presented with Barlow´s disease. All received surgery through mini-thoracotomy with annuloplasty plus neochords (n = 71) or annuloplasty-only (n = 31). One valve was replaced for endocarditis (repair rate: 99%). Results Annuloplasty-only patients were older (64 ± 16 vs. 55 ± 11 years, p = 0.008) and presented with higher risk (EuroSCORE II: 4.2 ± 4.9 vs. 1.6 ± 1.7, p = 0.007). Annuloplasty-only patients had shorter cross-clamp times (53 ± 18 min vs. 76 ± 23 min, p < 0.001) and received more tricuspid annuloplasty (15.5% vs. 48.4%, p < 0.001). Operating times were similar (170 ± 41 min vs. 164 ± 35, p = 0.455). In three patients, annuloplasty-only caused intraoperative systolic anterior motion (SAM), which was fully resolved by neochords to the posterior leaflet. There were no conversions to sternotomy or deaths at 30-days. Three patients required reoperation for recurrent MR (at 25 days, 2.8 and 7.8 years). At the latest follow-up, there was no MR in 81.4%, mild in 14.7%, and moderate in 2.9%. Three patients died due to non-cardiac reasons. Surviving patients report the absence of relevant symptoms. Conclusions Minimally-invasive Barlow’s repair is safe with good durability. Annuloplasty-only may be a simple solution for complex but symmetric pathologies. However, it may carry an increased risk of intraoperative SAM.

scholarly journals Multi-Machine Repairable System with One Unreliable Server and Variable Repair Rate

Mathematics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1299
Author(s):  
Shengli Lv
Keyword(s):  
Steady State ◽  
Transient State ◽  
Repairable System ◽  
Repair Rate ◽  
Numerical Illustration ◽  
Transform Method ◽  
Unreliable Server ◽  
Busy Time ◽  
The Mean ◽  
Mean Time

This paper analyzed the multi-machine repairable system with one unreliable server and one repairman. The machines may break at any time. One server oversees servicing the machine breakdown. The server may fail at any time with different failure rates in idle time and busy time. One repairman is responsible for repairing the server failure; the repair rate is variable to adapt to whether the machines are all functioning normally or not. All the time distributions are exponential. Using the quasi-birth-death(QBD) process theory, the steady-state availability of the machines, the steady-state availability of the server, and other steady-state indices of the system are given. The transient-state indices of the system, including the reliability of the machines and the reliability of the server, are obtained by solving the transient-state probabilistic differential equations. The Laplace–Stieltjes transform method is used to ascertain the mean time to the first breakdown of the system and the mean time to the first failure of the server. The case analysis and numerical illustration are presented to visualize the effects of the system parameters on various performance indices.

How can we protect flexible ureteroscope: Tips and tricks

2017 ◽  
Vol 16 (11) ◽  
pp. e2964
Author(s):  
V. Iordache ◽  
B. Geavlete ◽  
R. Multescu ◽  
P.A. Geavlete ◽  
M. Stan
Keyword(s):  
Tips And Tricks ◽  
Flexible Ureteroscope

Improved Durability of Flex-Xc Digital Flexible Ureteroscope: How Long Can You Expect It to Last?

Urology ◽  
2014 ◽  
Vol 84 (1) ◽  
pp. 32-35 ◽  
Author(s):  
Razvan Multescu ◽  
Bogdan Geavlete ◽  
Dragos Georgescu ◽  
Petrisor Geavlete
Keyword(s):  
Flexible Ureteroscope

Early and Mid-term Results of Mitral Valve Repair in Patients with Degenerative Mitral Regurgitation

2021 ◽  
Author(s):  
Hasan Erdem ◽  
Emre Selçuk
Keyword(s):  
Mitral Valve ◽  
Mitral Regurgitation ◽  
Mitral Valve Repair ◽  
Survival Rates ◽  
Mitral Valve Regurgitation ◽  
Valve Repair ◽  
Repair Rate ◽  
Mitral Repair ◽  
Mid Term Results

Objectives: In this study, we present the mid-term results of patients who underwent valve repair due to degenerative mitral valve regurgitation in the first five years of our mitral valve repair program. Patients and Methods: In this retrospective study, all patients who were operated for degenerative mitral regurgitation by a single surgical team between 2013 and 2017 were investigated. We determined early and mid-term cumulative survival rates, repair failure and freedom from reoperation. In addition, as a specific subgroup, the results of patients under 18 years of age after mitral valve repair were investigated Results: Mitral repair was performed in 121 of 153 degenerative mitral regurgitation patients during the study period. The overall repair rate was 79%. Mitral valve repair rate increased significantly over years. The Median follow-up time was 63 (range 10-92) months. Early mortality was 2.5% (n=3 patients). During the follow-up period, moderate-to-severe mitral regurgitation was observed in 14 (11.8%) patients, mitral valve reoperation was required in 7 (5.9%) patients. Valve repair was performed in 4 of 7 patients under the age of 18. There was no pediatric case requiring reoperation during the follow-up period (median 46 months). Conclusion: Mid-term results of mitral valve repair in degenerative mitral valve patients are satisfactory. The success rate of repair increases in line with surgical experience.

C163: Durability assessment of the Flex-Xc digital flexible ureteroscope

2014 ◽  
Vol 13 (6) ◽  
pp. e1343
Author(s):  
R. Multescu ◽  
P. Geavlete ◽  
D. Soroiu ◽  
D. Georgescu ◽  
G. Nita ◽  
...  
Keyword(s):  
Flexible Ureteroscope ◽  
Durability Assessment
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