Efficacy of navigating through the intraplaque route using AnteOwl WR intravascular ultrasound in femoropopliteal chronic total occlusion

Background There is no consensus on the optimal guidewire passage route for femoropopliteal (FP) chronic total occlusion (CTO). If intraplaque wiring can be performed, a stent-less strategy using a drug-coated balloon can be realized even with FP CTO, and there is a high possibility that good expansion can be obtained even when stent deployment is performed. AnteOwl WR (AnteOwl) is a novel intravascular ultrasound (IVUS) device useful for navigating the second guidewire into the intraplaque route under IVUS observation from the subintimal space. Here, we describe representative cases of FP CTO in which CTO-specific IVUS was extremely useful. Case presentation Case 1 involved a 79-year-old man with total occlusion of the left superficial femoral artery (SFA). We used a contralateral antegrade approach, but the guidewire was advanced into the subintimal space. We advanced AnteOwl into the CTO. By utilizing the asymmetric structure of the transducer and the IVUS wire, we were able to reflect the positional relationship among the IVUS transducer, IVUS wire, and target plaque onto the angiographic image. By aiming the wiring in that direction, we succeeded in traversing the center of the plaque and finally succeeded in obtaining good expansion using the drug-coated balloon. Case 2 involved a 76-year-old woman with total occlusion from the SFA to the popliteal artery. We used an ipsilateral antegrade approach. When AnteOwl was placed on the wire and advanced to the popliteal artery, the subintimal space in the middle of the SFA could be visualized. We employed an IVUS-guided parallel wiring technique and succeeded in passing through all intraplaque routes. Although the CTO was long, we could easily advance through the intraplaque route by reflecting the information obtained from AnteOwl in angiography. Conclusions AnteOwl is an effective IVUS for FP CTO and facilitates a complex IVUS-guided procedure.

Efficacy of Navigating Through the Intraplaque Route using AnteOwl WR Intravascular Ultrasound in Femoropopliteal Chronic Total Occlusion

BackgroundThere is no consensus on the optimal guidewire passage route for femoropopliteal (FP) chronic total occlusion (CTO). If intraplaque wiring can be performed, a stent-less strategy using a drug-coated balloon (DCB) can be realized even with FP CTO, and there is a high possibility that good expansion can be obtained even when stent deployment is performed. AnteOwl WR (AnteOwl) is a novel intravascular ultrasound (IVUS) device useful for navigating the second guidewire into the intraplaque route under IVUS observation from the subintimal space. Here, we describe representative cases of FP CTO in which CTO-specific IVUS was extremely useful.Case presentationCase 1 was a 79-year-old man undergoing hemodialysis who presented with claudication of the left lower limb. Control angiography showed total occlusion of the left superficial femoral artery (SFA). We performed antegrade wiring, but the guidewire was advanced into the subintimal space. We advanced AnteOwl into CTO. Using the AnteOwl IVUS transducer and IVUS-wire bias, we found that the IVUS-wire is at the top and the transducer is at the bottom, and based on this information, a plaque to aim exists on the right side of the IVUS catheter at right anterior oblique of 30°. By aiming the wiring in that direction, we succeeded in traversing the center of the plaque and finally succeeded in obtaining good expansion using the DCB. Case 2 was of an 76-year-old woman with ulceration and gangrene of the left foot. Control angiography showed total occlusion from the SFA to the popliteal artery (Pop A). When AnteOwl was placed on the wire and advanced to the Pop A, the subintimal space in the middle of the SFA could be visualized. We employed an IVUS-guided parallel wire technique and succeeded in passing through all intraplaque routes. Although the CTO was long, we could easily advance through the intraplaque route by reflecting the information obtained from AnteOwl in angiography.ConclusionsAnteOwl is an effective IVUS technique for FP CTO and facilitates a complex IVUS-guided procedure.

Adhesive properties of bio-based epoxy resin reinforced by cellulose nanocrystal additives

The adhesive properties of a self-prepared bio-based epoxy resin with native cellulose nanocrystals (CNCs) are evaluated in this article. The porosity of actual CNCs is high. The most promising finding is the acquisition of high tensile modulus. The addition of CNC composites significantly increased the tensile modulus at lower wt.%, and the maximum crystallinity of CNCs was obtained. Bearing in mind the advantages of CNCs, scanning electron microscopy (SEM) showed a uniform distribution of concentrated CNCs. Clusters were formed at higher CNCs ratios, and the composite matrix content with high CNCs produced good expansion, low crystallinity, and increased elongation. Our analysis showed that the original CNCs were more evenly distributed in the self-prepared bio-based epoxy resin, which enhanced transformation, supported by improved dispersion of native CNCs. The presence of native CNCs greatly improved and enhanced the bonding performance of the bio-based epoxy resin in the interface area. Enhancing the mechanical properties of native CNCs has broad application prospects in environmental areas. This suggests that the widespread use of native CNCs in environmental engineering applications is feasible, especially in terms of adhesives properties.

Numerical simulation and experimental study of the bursting performance of triaxial woven fabric and its reinforced rubber composites

In this paper, the bursting performance of triaxial woven fabric and its reinforced rubber composites are studied by the finite element method and the experimental approach, and compared with plain woven fabric and its reinforced rubber composites. The bursting morphologies and load–displacement curves of the specimens during the bursting process are obtained. The results indicate that the rubber matrix has a protective and consolidation effect on the inner fabric, significantly improving the bursting strength of the fabric. Triaxial woven fabric shows a steeper load–displacement slope, higher maximum bursting load, and smaller initial damage displacement than plain woven fabric. The bursting morphologies of the specimens indicate that the structure of triaxial woven fabric is more stable and exhibits good expansion resistance to bursting damage. The bursting process of triaxial woven fabric can be divided into four stages: yarn straightening, yarn slippage, yarn breakage, and breakage extension.

RANCANG BANGUN MOLD UNTUK PROSES TERMOFORMING PROSTHETIC BELOW KNEE (B/K)

ABSTRAK Industri semakin berkembang, kebutuhan terhadap plastik pun semakin bertambah. Akan tetapi, dalam aplikasi proses pembentukan plastik sering mengalami kendala. Salah satunya adalah penyusutan. Penyusutan sering terjadi pada proses pembentukan plastik, terutama pembentukan dengan sistem mechanical thermoforming. Sehingga perlu dianalisis hal-hal yang menyebabkan penyusutan pada produk yang dihasilkan. Beberapa hal yang diidentifikasi mempengaruhi terjadinya penyusutan adalah bentuk mold, temperatur, dan jenis plastik yang digunakan.Metode penelitian yang digunakan adalah membuat alat uji mechanical thermoforming dan membuat mold yang akan digunakan untuk menganalisis penyusutan. Mold yang digunakan ada 2 macam, yaitu mold telapak kaki atas dan mold telapak kaki bawah. Selain variasi pada mold, analisis juga ditujukan pada temperatur plastik polypropylene (PP) dan plastik PVC yang akan diproses. Variasi temperatur yaitu:1000C, 1200C, dan 140oC. Sedangkan jenis plastik yang diujikan adalah plastikpolypropylene (PP) dan plastik PVC.Dari data hasil pengujian dan pembahasan pada proses mechanical thermoforming untuk plastik polypropylene (PP) dengan ketebalan 1,0 mm tidak dapat dianalisis persentase penyusutan yang terjadi karena sifat viskos pada plastik rendah. Pada plastik jenis PP ini meskipun membentuk pola, tetapi tidak sempurna. Bahan plastik PP setelah proses penekanan dengan temperatur 100ºC-120ºC plastik tidak mengalami pemuaian yang cukup baik, karena plastik masih bersifat elastik. Pada temperatur140ºC plastik mengalami pemuaian, tetapi saat proses penekanan plastik mengalami bentuk pola yang tidak sempurna, karena temperatur terlalu tinggi. Sedangkan pada plastik PVC didapatkan hasil bahwa pada mold telapak kaki atas dengan ketinggian2 cm dan tebal plastik 1,0 mm menghasilkan persentase penyusutan rata-rata 7,85% dengan temperatur 100ºC, 9,80% dengan temperatur 120ºC dan 12,11% dengan temperatur 140ºC. Pada mold telapak kaki bawah dengan ketinggian 2 cm dan tebal plastik 1,0 mm menghasilkan persentase penyusutan rata-rata 10,01% dengan temperatur 100ºC, 10,96% dengan temperatur 120ºC dan 12,08% dengan temperatur140ºC. Kata Kunci: Mechanical thermoforming, penyusutan plastik, mold ABSTRACT The growing of industry has the effect to the increase of plastic need. However, the application of plastic forming process often experiences constraints. One of them is depreciation. Depreciation often occurs in the plastic forming process, especially forming with mechanical thermoforming system. So it is necessary to analyze the things that cause shrinkage on the product. Some of the things that are identified to influence the shrinkage are the molds, temperatures and types of used plastics.The used method is to make mechanical thermoforming test and make mold which will be used to analyze depreciation. There are 2 kinds of molds, namely upper foot sole mold and bottom foot sole mold. In addition to the variations of the mold, the analysis is also aimed at the temperature of polypropylene plastic (PP) and PVC plastic which will be processed. The temperature variations are 1000C, 1200C and 140oC and the types of plastics that are tested is polypropylene plastic (PP) and PVC plastic.The results show that on mechanical thermoforming process for polypropylene (PP) plastic with 1.0 mm thickness, the percentage of shrinkage can not be analyzed because of the low viscous nature of plastic. PP type plastic can form a pattern, but not perfect. PP plastic material does not experience a good expansion after pressing process with100ºC-120ºC plastic temperature. This is because the plastic is still elastic. At 140ºC, the plastic undergoes expansion, but when the plastic pressing process, it undergoes an imperfect pattern. The reason is the temperature is too high. Meanwhile for the PVC plastic, it was found that in the upper foot sole mold with height of 2 cm and 1.0 mm plastic thickness, the percentages of shrinkage average are 7.85% with temperature100ºC, 9.80% with temperature 120ºC and 12.11% with temperature of 140ºC. In the bottom foot sole mold with 2 cm height and 1.0 mm plastic thickness, the percentages of shrinkage average are 10.01% with temperature 100ºC, 10.96% with temperature120ºC and 12.08% with temperature 140ºC. Keywords: Mechanical thermoforming, plastic shrinkage, mold

Development of Magnetic Bearing Monitoring System

The monitoring system of AMB (Active Magnetic Bearing) can display rotor displacement signals and real-time current signal of electromagnetic coils, monitoring the rotor running status of AMB. This article describes the monitoring system that is based on the AMB original hardware circuit and details of its hardware components and software modules function. Experiments show that: the function of each part of the electromagnetic bearing monitoring system uptime, and has good expansion; this system has been successfully applied in second flexible critical speed rotor magnetic bearing system.

A Preliminary Study of the HPN Robot

Soft robots are robots made of soft materials and actuators. Previously we proposed the HPN (Honeycomb PneuNets) Robot, where PneuNets were placed as actuators into honeycomb shaped elastomer. In this paper, we present some progress of this effort. A random search algorithm is applied to plan the obstacle-avoid movements of an HPN robot. We test it through several cases, and the results showed that the algorithm can work effectively. We introduce an HPN robot prototype, which is made of RTV-2 silicone rubber. Preliminary experiments showed that some good expansion rate and flexibility can be achieved. A piston and soft body simulation model of HPN robots is also presented, which can mimic the basic behaviors of the HPN robot.

Study on the Realization of Music Education and Teaching Management System of Universities

Aiming at developing a music education and teaching management system for universities, the user’s need for this system is analyzed in this study. The system’s development process has always been object-oriented analysis and design analysis of needs, combined with extensive application of computer technology, the various features of object-oriented design, and ultimately a university music education tailored to teaching management system. The system uses J2EE architecture, using tomcat as a server, using Microsoft launched the SQL Server database as a background support. The Struts MVC architecture design is used to ensure good maintenance of the system with the same time enhances data processing capabilities. data with the view of the separation technology is used to keep good expansion of the system and promote the maintenance for the system.

Lipschitz Functions on Expanders are Typically Flat

This work studies the typical behaviour of random integer-valued Lipschitz functions on expander graphs with sufficiently good expansion. We consider two families of functions: M-Lipschitz functions (functions which change by at most M along edges) and integer-homomorphisms (functions which change by exactly 1 along edges). We prove that such functions typically exhibit very small fluctuations. For instance, we show that a uniformly chosen M-Lipschitz function takes only M+1 values on most of the graph, with a double exponential decay for the probability of taking other values.