Test Method for Bend Testing of Needles Used in Surgical Sutures

10.1520/f1874 ◽  
2020 ◽  
Author(s):  
Keyword(s):  
Test Method ◽  
Bend Testing ◽  
Surgical Sutures

scholarly journals The Antibiofilm Effect of a Medical Device Containing TIAB on Microorganisms Associated with Surgical Site Infection

Molecules ◽  
2019 ◽  
Vol 24 (12) ◽  
pp. 2280 ◽  
Author(s):  
Valentina Puca ◽  
Tonino Traini ◽  
Simone Guarnieri ◽  
Simone Carradori ◽  
Francesca Sisto ◽  
...  
Keyword(s):  
Medical Device ◽  
Biofilm Formation ◽  
Inhibitory Concentration ◽  
Laser Scanning Microscopy ◽  
Test Method ◽  
Antibiofilm Activity ◽  
E Coli ◽  
Post Surgery ◽  
Agar Diffusion Test ◽  
Surgical Sutures

Surgical site infections (SSIs) represent the most common nosocomial infections, and surgical sutures are optimal surfaces for bacterial adhesion and biofilm formation. Staphylococcus spp., Enterococcus spp., and Escherichia coli are the most commonly isolated microorganisms. The aim of this research was to evaluate the antibiofilm activity of a medical device (MD) containing TIAB, which is a silver-nanotech patented product. The antibacterial effect was evaluated against Staphylococcus aureus ATCC 29213, Enterococcus faecalis ATCC 29212, and E. coli ATCC 25922 by assessing the minimum inhibitory concentration (MIC) by the Alamar Blue® (AB) assay. The antibiofilm effect was determined by evaluation of the minimum biofilm inhibitory concentration (MBIC) and colony-forming unit (CFU) count. Subsequently, the MD was applied on sutures exposed to the bacterial species. The antimicrobial and antibiofilm effects were evaluated by the agar diffusion test method, confocal laser scanning microscopy (CLSM), and scanning electron microscopy (SEM). The MIC was determined for S. aureus and E. faecalis at 2 mg/mL, while the MBIC was 1.5 mg/mL for S. aureus and 1 mg/mL for E. faecalis. The formation of an inhibition zone around three different treated sutures confirmed the antimicrobial activity, while the SEM and CLSM analysis performed on the MD-treated sutures underlined the presence of a few adhesive cells, which were for the most part dead. The MD showed antimicrobial and antibiofilm activities versus S. aureus and E. faecalis, but a lower efficacy against E. coli. Surgical sutures coated with the MD have the potential to reduce SSIs as well as the risk of biofilm formation post-surgery.

The IC in the Flexible Hybrid Electronics Technology: Flexibility and Bend Testing

2017 ◽  
Vol 2017 (1) ◽  
pp. 000103-000108 ◽  
Author(s):  
Val R. Marinov
Keyword(s):  
Flexural Strength ◽  
Empirical Test ◽  
Critical Issue ◽  
Test Method ◽  
Circuit Board ◽  
Radius Of Curvature ◽  
Bend Testing ◽  
Die Geometry ◽  
Silicon Chips ◽  
Semi Empirical

Abstract Flexible Hybrid Electronics (FHE) can be described as thinned, flexible silicon chips packaged on flexible circuit board (FCB) with printed conductors and passives. The flexibility of ICs can be achieved only if the thickness of the silicon is reduced to 50μm or less. The bend testing of the ultra-thin dies is a critical issue in the FHE technology as it allows to establish the fundamental relationships between the die flexural strength, die geometry, and the methods for thinning and dicing the silicon. The conventional bend tests are not adequate for testing ultra-thin dies. Presented is a semi-empirical test method, which allows for the estimation of the flexural strength of the highly compliant ultra-thin dies. The limiting Radius of Curvature (RoC) is an important parameter for the FHE device since it accounts for the bending characteristics of the entire FHE device, not only the IC. Presented is a simple analytical approach that allows to estimate the minimum RoC for an FHE assembly.

Metrological support of individual blood glucose meters in telemedicine

2019 ◽  
pp. 52-56
Author(s):  
Yu.F. Glukhov ◽  
N.V. Krutikov ◽  
A.V. Ivanov ◽  
N.P. Muravskaya
Keyword(s):  
Blood Glucose ◽  
Blood Glucose Level ◽  
Glucose Level ◽  
Measurement Data ◽  
Test Method ◽  
Level Measurement ◽  
Measurement Devices ◽  
Real Practice ◽  
Health Care Centers ◽  
Medical Measurement

We have studied and analyzed status and metrological supervision of blood glucose monitors, individual devices for a person’s blood glucose level measurement. It has been indicated that nowadays blood glucose monitors like other individual devices for medical measurement are not allowed to be involved in telemedicine public service. This accounts for absence of metrological supervision with these measurement devices in telemedicine. In addition, the key problem is absence of safe methods and means of remote verificaition, calibration and transmission of measurement data to health care centers. The article offers a remote test method for blood glucose monitors using a number of resistors with values correlating with measured blood glucose level. The available method has been successfully trialed in real practice.

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