Dr. S. Kanagaraj


Mechanical Engineering

Indian Institute of Technology Guwahati

Assam - 781039

email: kanagaraj[at]iitg.ernet.in

Brief Introduction

Dr. S. Kanagaraj graduated from Thiagarajar college of Engineering, Madurai, affiliated to Madurai Kamaraj University in 1997. He received his Ph.D degree from Indian Institute of Technology Kharagpur in 2004. He did his post-doctorate at University of Aveiro, Portugal till May 2008 and then he has been with the Department of Mechanical Engineering at the Indian Institute of Technology Guwahati since 2008. He was appointed as an Associate Professor and Professor in 2012 and 2017, respectively. His research interests include biomedical devices, biomaterials, assistive technology devices, prosthesis and orthosis, and materials characterization. He has received many awards including BIRAC-SRISTI GYTI Award 2016, Silver Award for Best Innovator at 7th India Innovation Initiative - i3 National Fair 2015, award under MLM (More from Less for Many) category from Gandhian Young Technical Innovation Award 2015, and meritorious scholar award in 2001 and 2002. He has authored more than 77 journal and conference papers. One US patent was granted and 4 Indian patents were applied. Three students completed their Ph.D and 10 students are currently doing their Ph.D under his supervision in addition to 1 post doctorate fellow. He has completed 8 projects as a PI worth of about Rs. 4.5 crore and there are 4 on-going projects worth of Rs.6.6 crore and one consultancy project worth of Rs.11.5 lakh. He completed 1 consultancy project, 4 projects as a Co-PI. He started one startup company, M/s Assistive Devices Technology Private Limited, Guwahati


Design and development of passive polycentric knee joint and dynamic ankle joint for trans-femoral amputees:

Background: According to World Health Organization (WHO), there are about 30 million amputees currently living in developing countries like Asia, Africa and South America etc. According to the 2011 census, there are 5.4 million locomotor disabled persons in India. It is estimated that around 5-15% of them acquire a prosthetic medical device, and up to 80% of amputees are not able to bear the cost of prosthesis. A knee joint is one of the strongest and most important joints in the human body. Movements at the knee joint are essential to many activities, including walking, running, sitting and standing. The above knee amputation is a surgical interference that severs the thigh segment between the hip and knee joint. Though many prosthetic devices are available in the market, which can generate sophisticated and versatile functional joint movements equivalent to that of human lower limb, each one of them has inherent limitations in different aspects. The commercially available prosthetic devices are either expensive or produce many technical problems leading to mismatch of the gait pattern of both sound and prosthetic leg.

Objective: The objective of the present work is to design and develop a light weight and user friendly passive artificial limb having prosthetic knee joint and dynamic ankle joint with improved functionality and affordability.

Material and Method: The knee joint, fabricated from Acrylonitrile butadiene styrene (ABS)/Nylon-66 was designed based on the Grashof's criterion, stance phase stability, extension bias and the maximum flexion angle. Developed design was tested in ANSYS as per the ISO 10328 loading conditions. Based on the results obtained from the analysis, the product was fabricated. The ankle joint with different kinematic motions was testing under the dynamic loading conditions as per ISO standard.

Results and conclusion: The maximum stress, strain, and deflection developed in the knee joint and akle joint under the ISO 10328 loading condition were found to be within the acceptable limits. The polymeric-passive-polycentric-prosthetic knee joint having significant advantages over conventional knee joints was designed, developed and trialed with good number of amputees. The dynamic ankle joint is being fabricated.