Modified Laparoscopic Tool for Enhanced Haptic Feedback

2018 ◽  
Author(s):  
Rajesh Kumar ◽  
Sudipto Mukherjee
Keyword(s):  
Friction Coefficient ◽  
Surface Finish ◽  
Haptic Feedback ◽  
Minimal Invasive ◽  
Tactile Sensation ◽  
New Device ◽  
Input Force ◽  
Joint Clearances ◽  
The Cost ◽  
Original Device

Laparoscopic Devices are known to be used in Minimal Invasive Surgeries. However, the devices are unable to transmit the spectrum of feedback of the tissue to the hands of the surgeon, which makes the surgical procedure difficult. We have demonstrated a parameterization for the loss in feedback due to backlash and friction. Backlash is correlated to the joint clearances while friction correlates to joint clearance as well as the surface finish of mating pairs, though joint clearances don’t affect the friction coefficient largely. The laparoscope behavior has been dynamically modeled to understand and predict the behavior. Also, the cost to manufacture the graspers has been weighed against force bandwidth and reliability of improving the joint tolerances of the device so that it is able to transmit the desired force bandwidth. We conclude that to achieve kHz force bandwidth through purely mechanical means would entail prohibitively expensive manufacturing means and hence, we propose an alternate design. The alternate design makes the system deterministic without uncertainty in the position of the joint pins. The kinematically constrained joints in the new device completely transmit the input force spectrum at frequencies of multiple kHz. The non-sophisticated alteration in the original device doesn’t significantly alleviate the cost and eludes the loss of tactile sensation.

Study of Friction Coefficient and Friction Force on Magnetic Abrasive Finishing

2011 ◽  
Vol 675-677 ◽  
pp. 663-666
Author(s):  
Yan Chen ◽  
Akira Shimamoto ◽  
X. Gao ◽  
M.M. Zhang
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Magnetic Particles ◽  
Good Effect ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Particles ◽  
Abrasive Finishing ◽  
Alumina Particles ◽  
The Cost ◽  
Grinding Efficiency

In order to enhance grinding efficiency of the magnetic abrasive finishing (MAF) method, we usually use the sinter method or the cementation method to mix the magnetic particles and abrasive particles together. However, the cost is high, and the variety is incomplete. Therefore, with the ferromagnetism to iron particles, the alumina particles and the lipin three kind of material simple mixture participate in the magnetic abrasive finishing which directly polishes, already obtained the good effect through the experiment. This paper analyses and explains the characteristic of the friction coefficient and the friction force on magnetic abrasive finishing according as account and experiment data.

scholarly journals Management of Smart Switchboard Placement to Enhance Distribution System Reliability

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1406
Author(s):  
Peter Holcsik ◽  
Judith Pálfi ◽  
Miklos Tompa ◽  
Janusz Grabara ◽  
Zsolt Čonka ◽  
...  
Keyword(s):  
Distribution System ◽  
Low Voltage ◽  
Optimal Placement ◽  
Optimal Decision ◽  
Electric Industry ◽  
Complex Investigation ◽  
Network Characteristics ◽  
New Device ◽  
Distribution System Reliability ◽  
The Cost

One way of handling short-time short-circuits without causing equipment failure is the management of the reclose function integrated into smart switchboard which is described in this article. Due to the cost of the application, the optimal placement of such equipment must be well-planned. During the planning of the placement optimization of a low-voltage electricity network quality, the increase of the consumer supply security must be considered along with the best economic utilization. The research presented in this article aims to introduce a new special decision support methodology calculated with these variables. The management of smart switchboard (SSB) tool installation into low voltage (LV) network was investigated. The selection of the placement nodes is based on the complex investigation of the network characteristics. Investigation is performed by empiric analysis. This method can support the power companies to make the optimal decision. The presented new device can have outstanding importance for the electric industry and for further research as no testing results of such investigations have been published yet.

Performance Evaluation of Hot-Mix Asphalt Using Rotary Loaded-Wheel Testing

2005 ◽  
Vol 1929 (1) ◽  
pp. 157-164
Author(s):  
M. Shane Buchanan ◽  
Benjamin J. Smith
Keyword(s):  
Hot Mix Asphalt ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Hydrated Lime ◽  
New Device ◽  
Proof Testing ◽  
Reasonable Prediction ◽  
The Cost ◽  
Performance Results ◽  
Transportation Agencies

Permanent deformation and moisture damage (i.e., rutting and stripping) are two predominant hot-mix asphalt (HMA) distresses. Rutting can be caused by many factors, including stripping, which result in reduced HMA shear strength. Hot-mix asphalt stripping evaluation is a source of significant industry discussion and debate. Transportation agencies use a number of methods to evaluate stripping, with many methods customized depending on local concerns and environmental conditions. Today, many agencies use some type of loaded-wheel testing, with associated mix “pass–fail” criteria, as part of the mix design acceptance procedure. This process is often referred to as “proof” testing and provides a higher confidence that the HMA mix will perform satisfactorily during service conditions. A new device, the rotary wheel tester, has been developed to evaluate the rutting and stripping performance of HMA mixes. This device operates on a principle similar to that of the Hamburg wheel tester: the main difference is that the specimen is loaded along its diameter instead of from the top. The cost of the rotary wheel tester is less than half that of the Hamburg wheel tester. Testing was conducted to determine whether the rotary wheel tester could distinguish between good- and poor-performing mixes and to determine whether PG 76-22 or PG 67-22 plus hydrated lime improved mix performance. Results indicate that the rotary wheel tester is an easy-to-use testing device that appears to provide reasonable prediction of the rutting and stripping performance of HMA mixes. It also appears that PG 76-22 asphalt binder improves mix performance to a greater extent than does PG 67-22 plus hydrated lime.

New Device for Ergonomic Control of a Surgical Robot with 4 DOF Including Haptic Feedback

2013 ◽  
Author(s):  
Carsten Neupert ◽  
Florian Klug ◽  
Sebastian Matich ◽  
Andreas Kirschniak ◽  
Peter P. Pott ◽  
...  
Keyword(s):  
Haptic Feedback ◽  
Surgical Robot ◽  
New Device

A Liquid Metal Based Multimodal Sensor and Haptic Feedback Device for Thermal and Tactile Sensation Generation in Virtual Reality

2020 ◽  
pp. 2007772
Author(s):  
Jinhyeok Oh ◽  
Suin Kim ◽  
Sangyeop Lee ◽  
Seongmin Jeong ◽  
Seung Hwan Ko ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Liquid Metal ◽  
Haptic Feedback ◽  
Tactile Sensation

Compression anastomotic device

2015 ◽  
Vol 9 (2) ◽  
pp. 0-0
Author(s):  
Власов ◽  
A. Vlasov
Keyword(s):  
Clinical Practice ◽  
Subtotal Colectomy ◽  
New Technology ◽  
Compression Force ◽  
Colonic Anastomoses ◽  
Anastomotic Complications ◽  
New Device ◽  
Different Diameters ◽  
Device Simple ◽  
Original Device

The purpose of this study is to develop and clinical use the new technology of forming a circular compression seam for improvement the surgical results. Materials and methods. The author has proposed a new device – compression anastomotic device (RF patent № 110246). This is device simple, comfortable and reliable. The compression force is created by means of the special steel spring. Compression anastomotic device has 3 types of diameters: 28, 31 and 33 mm, this allows to using them at different diameters anastomosing bodies and throughout the colon. Results. The CAD has been applied in clinical practice in 71 resections for colon cancer: 20 right-sided hemicolectomy, 5 resections of the transverse colon, 12 left-sided hemicolectomy, 17 resection of the sigmoid colon, 6 subtotal colectomy and 11 anterior resections. There were no anastomotic complications. Conclusion. The author has created original device for forming a compression colonic anastomoses and implemented new technology into clinical practice, it helps to prevent the development of postoperative complications.

scholarly journals Application of automatic control furnace for combustion of biomass briquette fuel for tobacco curing

2020 ◽  
pp. 148-148
Author(s):  
Zhaopeng Song ◽  
Fengjie Wei ◽  
Xinfeng Su ◽  
Yongjun Wang ◽  
Yikuan Fan ◽  
...  
Keyword(s):  
Computer Technology ◽  
Biomass Energy ◽  
Small Scale ◽  
New Device ◽  
Direct Combustion ◽  
Curing Characteristics ◽  
Tobacco Production ◽  
Heat Demand ◽  
The Cost ◽  
First Time

Applying biomass energy for curing flue-cured/Virginia tobacco heating is the best way to realize green tobacco production. Aiming to satisfy the heating demand for flue-cured tobacco curing, a new heating device that uses biomass briquettes as fuel for curing tobacco is adopted the first time, which was developed using modern mature electromechanical and computer technology. The new device consists of automatic feeding, ash cleaning, ventilation, and ignition systems governed by an intelligent tobacco-curing controller designed for specific curing characteristics. The results of experiments conducted with an original direct combustion coal furnace, bulk curing barn, and controlled coal-fired heating indicated that the heat supply of the new device could satisfy the heat demand during the tobacco curing process, with a good performance-controlling difference of ? 0.5?C between the actual and target dry-bulb temperature in the barn. With its unattended heating management and use of fully burning fuel, the new device sharply decreased the cost of manual operation and tobacco leaves required per kilogram compared to a coal furnace. Considering the shape of its structure, the new device could be used to heat homes or small-scale boilers if the chip procedure of the controller is altered.

scholarly journals Analytical bond behavior of cold drawn SMA crimped fibers considering embedded length and fiber wave depth

2021 ◽  
Vol 60 (1) ◽  
pp. 862-883
Author(s):  
Ha Vinh Ho ◽  
Eunsoo Choi ◽  
Jun Won Kang
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Fiber Reinforced Concrete ◽  
Recovery Stress ◽  
Bond Behavior ◽  
Fea Model ◽  
Niti Sma ◽  
Increasing Trend ◽  
Cohesive Surface ◽  
The Cost

Abstract The NiTi SMA fibers were cold drawn to introduce prestrain, and then, they were made to crimped fibers with various wave depths. The recovery stress was measured, which was useful for closing the cracks in fiber-reinforced concrete. The pullout behaviors were also examined considering the existing recovery stress, and it is found that the recovery stress did not influence so much on the pullout behavior. According to the pullout results, a parametric study used a finite element analyzing (FEA) model to quantify the cohesive surface model’s parameters and the value of the friction coefficient. Then, the developed model is used to investigate the crimped fiber’s pullout behavior with various embedded lengths and wave depths. When the fiber in the elastic range, the peak stresses significantly raise due to increasing embedded waves; they show a linear relationship. After the yield of the SMA fiber, the peak stresses are also a function of embedded waves; however, the increasing trend is slow down. Concerning the cost, the even distribution of the fiber, and for guaranteeing the fiber experiences the pulling out, it is recommended that the embedded lengths and corresponding wave depths should be designed to avoid the yield.

Sign in / Sign up

Export Citation Format

Share Document