Light Cables Research Articles

A Case of Skin Burns Occurring during Laparoscopic Surgery

Skin burn injury from light cables is a rare complication of laparoscopic surgery. We report the case of a 57-year-old female who underwent laparoscopic-assisted right hemicolectomy under general anesthesia. During surgery, the anesthesiologist discovered that the tip of the light cable, with the light source powered on, penetrated the surgical drape and was positioned on the right forearm of the patient, where a bulla measuring 2.0× 2.5 cm in size and a second-degree burn were identified. All medical personnel participating in laparoscopic and arthroscopic procedures should always be aware that the light cable can cause burns to the patient. Additionally, after connecting the light cable to the scope, the light source should be activated. The light cable should not be placed around the patient or on the surgical drape while the light source is active. Immediately after completing the surgery, the power to the light source should be turned off, and the light cable should be placed in a safe place.

Design of Power Supply for Distributed Aero-engine Intelligent Control System

Compared with centralized power supply system architecture, distributed power supply architecture can better meet the requirements of distributed aero-engine intelligent control systems. The design of distributed power supply topology plays a vitally important role in the distributed power supply system. The paper presents an engineering design method of distributed power supply for the distributed control system in a certain aero-engine. The distributed power supply topology is developed. Based on this topology, the bus voltage level and the current of the distributed intelligent nodes are designed. The optimal selection method of transmission cable types between intelligent nodes is also provided based on the equivalent circuit of a distributed power supply system. The results show that the cable transmission loss and voltage drop meet the design specifications of electrical cable. The proposed distributed power scheme for the distributed engine control system results in minimal modifications, smaller transmission current, and lighter cables.

Geometry and Stability: Design and Construction of a 115m Span Freeform Roof in Kuala Lumpur

Pavilion Bukit Jalil Mall is a new high-end commercial development located in Bukit Jalil, Kuala Lumpur, Malaysia. The main attraction of the mall is the piazza, an external event space covered by the Mega Canopy, a 115m span and 20 to 40m high freeform steel roof covered with ETFE, supporting fans, lights and exhibits and providing an aerated and impressive 80m to 100m column-free space for the visitors. Although complex, the geometry was generated to fully take into account the buildability and to facilitate the fabrication of the ETFE. Many services run on the structure - such as lighting cables, winches cables or fans cables. The structure was designed so that all the cables could be fully concealed within the columns and above the main arches to keep the services out of sight. Challenging supporting conditions made the structure highly prone to buckling and sway. Optimization of the columns layout and height enabled to reduce the sensitivity of the structure to buckling while keeping an elegant and lightweight structure.

CMOS MAPS upgrade for the Belle II Vertex Detector

The success of the Belle II experiment in Japan relies on the very high instantaneous luminosity, close to 6×1035 cm−2 s−1, expected from the SuperKEKB collider. The corresponding beam conditions at such luminosity levels generate large rates of background particles and creates stringent constraints on the vertex detector, adding to the physics requirements. Current prospects for the occupancy rates in the present vertex detector (VXD) at full luminosity fall close to the acceptable limits and bear large uncertainties. In this context, the Belle II collaboration is considering the possibility to install an upgraded VXD system around 2027 to provide a sufficient safety margin with respect to the expected background rate and possibly enhance tracking and vertexing performance.The VTX collaboration has started the design of a fully pixelated VXD, called VTX, based on fast and highly granular Depleted Monolithic Active Pixel Sensors (DMAPS) integrated on light support structures.The two main technical features of the VTX proposal are the usage of a single sensor type over all the layers of the system and the overall material budget below 2% of radiation length, compared to the current VXD which has two different sensor technologies and about 3% of radiation length. A dedicated sensor (OBELIX), taylored to the specific needs of Belle II, is under development, evolving from the existing TJ-Monopix2 sensor. The time-stamping precision below 100 ns will allow all VTX layers to take part in the track finding strategy contrary to the current situation. The first two detection layers are designed according to a self-supported all-silicon ladder concept, where 4 contiguous sensors are diced out of a wafer, thinned and interconnected with post-processed redistribution layers. The outermost detection layers follow a more conventional approach with a cold plate and carbon fibre support structure, and light flex cables interconnecting the sensors.This document will review the context, technical details and development status of the proposed Belle II VTX.

Wireless vs. Wired Arthroscopic Cameras: A Comparative OR Simulation Study of Efficiency, Cost Per Case, Setup, and Takedown

Arthroscopic cameras have undergone numerous incremental improvements over the last 50 years and yet continue to be tethered by light and power cables. Technological advancements in operating room (OR) equipment hold the greatest promise for improvements in value-based care. This study compares the FDA-cleared, wireless ArthroFree SystemTM to a traditional wired camera in terms of setup, takedown, and total time under simulated OR conditions by nurses and scrub technicians with varying degrees of experience with arthroscopic equipment. The data collected was then used to determine setup and takedown efficiencies and projected cost savings. The participants also completed a human factors questionnaire at the conclusion of their participation. Results demonstrated the ArthroFree System was 44% (24.5 seconds) faster to assemble, 23% (4.9 seconds) faster to disassemble, and 38% (29.4 seconds) faster overall compared to a traditional wired camera system. With OR costs per minute ranging from $20 to $239.50 per minute, the projected savings per case are $9.80 to $117.36. On a Likert Scale (1=poor to 5=excellent) evaluating the following human factors—ease of setup, efficiency, ease of use, ease of disassemble, patient safety, and stress reduction—the ArthroFree wireless camera scored between 4.4 and 4.8 reflecting OR nurses and scrub technicians’ high ratings for all parameters.

The Wireless Arthroscopic Era Begins: Arthroscopy’s Evolution from the Incandescent Era to the Fiber-Optic Era to the Wireless Era

Arthroscopic surgery was invented in 1912, when Dr. Severin Nordentoft used a cystoscope powered by an incandescence light to visualize a knee joint. This form of visualization initiated the paradigm shift from open surgery to minimally invasive surgery. The next major paradigm shift occurred in the mid-1970s with the connection of the arthroscopic camera via a fiber-optic cable, powered by a Xenon or LED light, to a display monitor. This system has helped propel the arthroscopic market to an expected US $16.3 BN by 2027. While there have been numerous incremental advances in arthroscopic camera technology over the last half-century the current arthroscopic camera systems remains largely the same. They remain tethered to the tower by a power cable and, most importantly, a light cable that generates significant heat. ArthroFreeTM, a wireless arthroscopic surgical camera powered by a high-efficiency, low-heat light source, is expected to initiate the next paradigm shift in arthroscopy. The expected benefits of a wireless camera system include ease of use, improved OR efficiency, reduction in costs, and better patient outcomes.

Механические свойства, электропроводность и термостабильность проволоки из сплавов системы Al–Fe, полученных литьем в электромагнитный кристаллизатор

The development and production of new aluminum-based materials is a critical task of the up-to-date industry. Particularly, new materials are necessary to produce light, strong, and thermally-stable wires and cables for household usage, transport, and power sphere. The paper presents the results of the study of the microstructure and physical and mechanical properties of Al–0.5Fe and Al–1.7Fe alloys (wt. %), produced by continuous casting into an electromagnetic crystallizer (EMC). The authors carried out a comparative analysis of alloys under the study and commercial alloys. During this analysis, the authors produced a wire with the diameter of 3 mm from the primary cast blanks by the cold drawing method (CD). The microstructure analysis showed that as a result of casting into an electromagnetic crystallizer, the particles of metastable modification Al2Fe phase appear during the crystallization process that have sizes close to the nanometric range. The use of the cold drawing method led to the substructure formation in both alloys and the refinement of intermetallic particles, which ensured the significant hardening of alloy specimens. After cold drawing, the intermetallic particles were grinded and distributed along the boundaries of grains/sub-grains. The ultimate tensile strength of the Al–0.5Fe alloy was 204 MPa, while in the Al–1.7Fe alloy, it reached 295 MPa. The electrical conductivity level of the Al–0.5Fe and Al–1.7Fe alloys wire was 58.4 and 52.0 % IACS, respectively. The study showed that the Al–Fe alloys wire with ferrum concentration of up to 1.7 wt. % demonstrated thermal stability at the level of thermally-stable Al–Zr and Al–REM conductive alloys.

Design of a Planar Cable-Driven Parallel Robot for Non-Contact Tasks

Cable-driven parallel robots offer significant advantages in terms of workspace dimensions and payload capability. Their mechanical structure and transmission system consist of light and extendable cables that can withstand high tensile loads. Cables are wound and unwound by a set of motorized winches, so that the robot workspace dimensions mainly depend on the amount of cable that each drum can store. For this reason, these manipulators are attractive for many industrial tasks to be performed on a large scale, such as handling, pick-and-place, and manufacturing, without a substantial increase in costs and mechanical complexity with respect to a small-scale application. This paper presents the design of a planar overconstrained cable-driven parallel robot for quasi-static non-contact operations on planar vertical surfaces, such as laser engraving, inspection and thermal treatment. The overall mechanical structure of the robot is shown, by focusing on the actuation and guidance systems. A novel concept of the cable guidance system is outlined, which allows for a simple kinematic model to control the manipulator. As an application example, a laser diode is mounted onto the end-effector of a prototype to perform laser engraving on a paper sheet. Observations on the experiments are reported and discussed.

Dynamic model estimating and designing controller for the 2-DoF planar robot in interaction with cable-driven robot based on adaptive neural network

This study intends to investigate the dynamic model estimation and the design of an adaptive neural network based controller for a passive planar robot, performing 2-DoF motion pattern which is in interaction with an actuated cable-driven robot. In fact, the main goal of applying this structure is to use a number of light cables to drive serial robot links and track the desired reference model by the robot’s end-effector. The under study system can be used as a rehabilitation setup which is helpful for those with arm disability. In this way, upon applying sliding mode error dynamics, it is necessary to determine a vector that contains the matrices related to the robot dynamics. However, finding these matrices requires the use of computational approaches such as Newton-Euler or Lagrange. In addition, since the purpose of this paper is to express comprehensive methods, so with increasing the number of links and degrees of freedom of the robot, finding the dynamics of the robot becomes more difficult. Therefore, the Adaptive Neural Network (ANN) with specific inputs has been used for estimation unknown matrices of the system and the controller design has been performed based on it. So, the main idea in using an adaptive controller is the fact there is no pre-knowledge for the dynamic modeling of the system since the human arm could have different dynamic properties. Hence, the controller is formed by an ANN and robust term. In this way, the adaptation laws of the parameters are extracted by Lyapunov approach, and as a result, as aforementioned, the asymptotic stability of the whole of the system is guaranteed. Simulation results certify the efficiency of the proposed method. Finally, using the Roots Mean Square Error (RMSE) criteria, it has been revealed that, in the presence of bounded disturbance with different amplitude, adding the robust term to the controller leads to improve the tracking error about 34% and 62%, respectively.

Optimum Wavelength for Oxygen Detection using optical absorption

Oxygen gas detection systems are used in many areas such as environment, clinical, food and automotive industries. Most of the detection systems are based on chemical absorption sensing method. This type of sensing method has their own drawbacks. Therefore, a development of a new oxygen sensor using an optical method is necessary as an alternative to the current sensors. A preliminary study on the molecular absorption cross section for oxygen gas is vital to determine the optimum wavelength is reported. The experimental setup consists of four major components which are light source, gas cell, detector and optical fibre cable. For the light source, a deuterium-halogen bulb will be used as it can provide a broadband wavelength light source from 215 nm - 2500 nm. A miniature spectrometer will be used as the detector and the gas cell is connected to the light source and detector using the optical fibre cables. A software package to display absorption of oxygen molecules is installed in a computer to study on the optimum wavelength. The experiment results show that the light is most absorbed at 230 nm and absorption is increased by cell length. The highest absorption was observed to be in a 100 cm gas cell length with pressurized 5 bar of 99% pure oxygen gas. Based on this result, a wavelength of 230 nm is selected as optimum wavelength to detect oxygen.

Reducing fire and burn risk in the operating room-testing of a novel device.

Burn injury and operating room fires are significant risks for both surgical patients and staff. The purpose of this study was to examine the fire and burn risks associated with two types of fiberoptic light cables and evaluate the efficacy of a novel device in reducing the risk of these fire and burn injuries. A 300-W light source was connected sequentially to two standard fiberoptic cables (Storz and Olympus). The distal ends were buried in, or rested on, standard operating room materials including a cotton green towel and a blue propylene drape to assess the risk of fire formation or burn injury. The Gloshield device was then attached to the ends of the cables and the experiment was repeated. Trials simulating improper use of the device were then conducted with the Gloshield device placed either too deep or too shallow on the end of the light cable. All trials were conducted for a maximum of 10min or until a positive result (burn or fire) was achieved. Trials were conducted in room air or with supplemental 100% oxygen and repeated for accuracy. Both the Storz and Olympus fiber optic cables were capable of producing burns in standard operating room towels and drapes in control trials. The Gloshield device prevented thermal injury when properly attached in all conditions. Improper use trials demonstrated that the device may be ineffective when not applied properly. The Gloshield device is effective in reducing the risk of thermal burn injury by protecting the distal ends of endoscopic light cables from operating room materials. However, the device needs to be attached appropriately in order to provide protective benefits.

ОПТОВОЛОКОННІ СИСТЕМИ ПЕРЕДАЧІ ІНФОРМАЦІЇ

Features of information transmission on optical fibers in the presence of spark and electric noise are investigated in detail. The purpose of research: to determine the requirements for light sources, optical cables and photodetectors most suitable for the manufacture of fiber optic systems suitable for information exchange. The object of research is fiber optic systems. Research method is theoretical. The basic requirements for the choice of light-emitting diodes, photodiodes and optical cables in the technical implementation of optical communication in the presence of spark and electromagnetic interference. KEYWORDS: LED, OPTICAL LINE, PHOTODETECTOR, INFORMATION.

Study of Snap Loads for Idealized Mooring Configurations with a Buoy, Inextensible and Elastic Cable Combinations for the Multi-Float M4 Wave Energy Converter

There has been considerable modelling and wave basin validation of the multi-mode, multi-float, moored wave energy converter M4. The 6 float (2 power take off) (PTO) configuration is considered here with mooring from a buoy with light inextensible cables. Large mean mooring forces and very large peak or snap forces were measured in large waves while the rotational response about the hinges (for power take off in operational conditions) was predominantly linear. Modelling has been extended with elastic mooring cables connected directly to the base of the bow float and to the buoy. The experimental mean force is input to the linear diffraction/radiation model. The device response is effectively unchanged. The peak mooring force and tensions remain large with direct connection to the base of the bow float but are only slightly greater than the mean forces with elastic cables to the buoy, and an elastic hawser provides a further slight reduction. For the largest waves measured, the force was about 10% of the dry weight of the platform. The idealized efficient modelling may inform more detailed design while efficient methods for determining highly nonlinear mean forces remain to be established.

Experimental study of chemical composition of aluminium alloys

The Aluminium has been popular in the recent years due to the necessity to produce light weight components in the aircraft and automobile industries. These have been used in the manufacture of producing light weight transmission cables, heat exchangers, evaporators, automotive cylinder heads and radiators. These materials have excellent mechanical properties such as high tensile strength, high strength to weight ratio, corrosion resistance, ductility, formability, recyclability, etc. For these reasons, Aluminium alloys have been used in most of the applications. In this work the characteristics of aluminium alloys are studied and a new alloy with a different chemical composition is studied through experimental tests such as tensile test, hardness test and chemical test. The results were obtained from the experiments and were analyzed and conclusions were drawn.

Thermal injury to common operating room materials by fiber optic light sources and endoscopes.

To determine the thermal energy damage potential by heat sources, such as endoscopes and fiber optic light cables, in contact with materials commonly placed around an operating room (OR) table. Injury by xenon and halogen light sources were tested by direct and indirect contact using fiber optic light bundle cables and scopes at light intensities between ranging from Standby to 100%. The scopes had diameters ranging from 2.7 mm to 10 mm and were set at varying angles. The materials tested were surgical drapes, cotton towels, child shirts, child pants, lap sponges, X-ray detectable sponges, and Mayo covers. The damage potential was determined qualitatively by presence of smoking or smell of burning. Permutations involving direct contact were able to cause thermal injury, while permutations involving indirect contact, endoscopes, or halogen lamp were not. The xenon light source with the fiber optic light cable created thermal injury at light intensities of 50%, 75%, and 100%. Time to injury increased as light intensity was decreased. Only the surgical drape, child shorts, and cotton towel showed evidence of burn injury. This report supports the potential for thermal injury to the patient secondary to fiber optic light sources, although this potential may be limited in extent. The injury risk can be reduced by avoiding direct contact to materials overlying the patient, confirming standby mode or 25% light intensity, and maintaining the endoscope connected to the fiber optic cable at all times.

The "Body Mass Index" of Flexible Ureteroscopes.

To assess the "body mass index" (BMI) (weight and length) of 12 flexible ureteroscopes (digital and fiber optic) along with the light cables and camera heads, to make the best use of our instruments. Twelve different brand-new flexible ureteroscopes from four different manufacturers, along with eight camera heads and three light cables were evaluated. Each ureteroscope, camera head, and light cable was weighted; the total length of each ureteroscope, shaft, handle, flexible end-tip, and cable were all measured. According to our measurements (in grams [g]), the lightest ureteroscope was the LithoVue (277.5 g), while the heaviest was the URF-V2 (942.5 g). The lightest fiber optic endoscope was the Viper (309 g), while the heaviest was the Cobra (351.5 g). Taking into account the entirety of the endoscopes, the lightest ureteroscope was the Lithovue and the heaviest was the Wolf Cobra with the Wolf camera "3 CHIP HD KAMERA KOPF ENDOCAM LOGIC HD" (1474 g). The longest ureteroscope was the URF-P6 (101.6 cm) and the shortest was the LithoVue (95.5 cm); whereas the Viper and Cobra had the longest shaft (69 cm) and URF-V had the shortest shaft (67.2 cm). The URF-V2 had the longest flexible end-tip (7.6 cm), while the LithoVue had the shortest end-tip (5.7 cm) in both directions (up/down), while the URF-V had the shortest upward deflection (3.7 cm). Newer more versatile digital endoscopes were lighter than their traditional fiber optic counterparts in their entirety, with disposable endoscope having a clear advantage over other reusable ureteroscopes. Knowing the "BMI" of our flexible ureteroscopes is an important information that every endourologist should always take into consideration.

예인 음탐기용 케이블 개발

Cables for Towed Array Sonar System(TASS) were developed. In order to verify the performance of cables, environmental and operational conditions as well as functional requirements were investigated during design stage. Double armored high and low voltage integrated cable for towed body and two kinds of cables, armored and light weight power and optic hybrid cables for towed array sensor system were developed by modeling and simulation. Customized manufacturing process and test method, such as foam extrusion and dynamic fatigue test were applied to this development. In conclusion, underwater towed hybrid cable with high tensile strength and compact structure were developed.

Protection Against Common Mode Currents on Cables Exposed to HIRF or NEMP

Above deck, cables on naval ships are exposed to high-intensity radiated fields and nuclear electromagnetic pulse (NEMP) that may cause conducted interference and generate electromagnetic fields that exceed the immunity levels of commercially available equipment above and below deck. Exposed cables, such as open power plugs or lighting cables, are modeled and characterized both as a monopole antenna perpendicular to the deck and as a transmission line, representing a cable close to the deck. The placement of an illuminated cable close to the deck is a good protection measure for long cables at low frequencies, which includes NEMP protection. The coupled pulse from a high-intensity NEMP illumination is not expected to cause damage on electric installations. It is shown that for exposed cable length of maximum 25 cm and not placed in the line of sight of transmitters above 400 MHz, no additional protection measures are needed.

Laser Welding of Glass Replaces Glueing Procedure

AbstractGlass welding with femtosecond lasers is now ready for industrial practice. Clever heat management prevents tension and cracks occurring in the material. Laser welding supersedes earlier joining methods such as glueing as well as offering a number of advantages: no additional materials are necessary, no evaporation and embrittlement of materials, and greater durability. Laser welded glass protective caps for laser light cables are one demonstration of it. Furthermore, glass welding by laser opens up new design options.

인체 감지형 자기장 코일의 감지거리 13.4mm를 이용한 디지털 잠금장치 설계에 관한 연구

Abstract This study evaluated a digital locking device design using detection distance of 13.4mm of a human bodysensing type magnetic field coil. In contrast to digital locking devices that are used nowadays, the existing serial number entering buttons, lighting, number cover, corresponding pcb, exterior case, and data delivery cables have beendeleted and are only composed of control ON/OFF power switches and emergency terminals. When the magnetic fieldcoil substrates installed inside the inner case detects the electric resistance delivered from the opposite side of the12mm interval exterior contacting the glass body part, the corresponding induced current flows. At this time, the magnetic field coil takes the role as a sensor when coil frequency of the circular coil is transformed. The magnetic coil as a sensor detects a change in the oscillation frequency output before and after the body is detected. This isthen amplified to larger than 2,000%, transformed into digital signals, and delivered to exclusive software to compareand search for embedded data. The detection time followed by the touch area of the body standard to a 12.8O magnetic field coil was 30% contrast at 0.08sec and 80% contrast at 0.03sec, in which the detection distance was 13.4mm, showing the best level