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  Digital Catalogue for Technology and Products Development

   Technology and Product Development

    Basic Information

Technology developed: Passive Polycentric Knee Joint with Variable Link Length, Knee Rotator and Anterior-posterior Transl (TP19765340412)
Category: Nil
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Technical Application Area: Healthcare
If 'Other', please specify:
Please give more details of new technical application area:
The present invention is related to the passively operated prosthetic knee joint having the kinematics of four bar linkage planar mechanism More precisely the invention presents a polycentric knee joint with patient specific settings to change the length of the link used in the anterior and posterior side of the knee joint while ensuring its stability at the stance phase of the gait cycle in all conditions including variable walking speed greater toe clearance and different sizes of the residual limb Additionally for a specific set of length of the link the instantaneous center of rotation can move from superior to inferior position along the trochanter knee ankle TKA alignment line and anterior to posterior movement across the TKA alignment line at static condition during the fitment of knee joint prosthesis In addition a spring assisted knee rotator mechanism is incorporated within the top part of the knee joint to assist the cross legged sitting on the ground at no load condition Furthermore a dovetail adaptor enables the anterior posterior movement of the knee prosthesis to ensure the alignment of the load line and knee axis according to the need of the patient Moreover an elastomer which acts as an extension stopper is fixed posteriorly to absorb the force generated during the terminal impact at the end of the swing phase due to the retraction of torsion spring to its initial position and it also helps in minimizing the generated shock and noise and the change in stability significantly
Indian Institute of Technology (IIT) Guwahati
Affiliated Ministry: Ministry of Education
Type of technology development: Indigenous
Does the technology help in replacing any import items currently
procured from outside India?
Does the technology have export potential? Yes
Category of Technology developed: Import Substitution
Stage of Development: Field Test
Please describe in detail including the TRL Level:
A set of 5 pieces have been ordered for manufacturing . Different parts of the prototypes have been manufactured and assembly of the manufactured parts is still awaited. After the assembly protype will be ready for the field test in which several parameters of the GAIT cycle need to be assesed along with the compatibility of the developed protype with differeny stump length amputees. After the evalutaion of the obtained data from various parameters prototype will be enhanced in case of constructive feedback or can be sent for the batch or mass production.


Applications: 30 million amputees currently living in developing countries like Asia, Africa and South America out of which 9 million people have suffered from TF amputation and are in need of prosthetic knee joint. According to the 2011 census of India there are 5.4 million locomotor disabled persons in India. Only 5-15 percentage amputees acquires a prosthetic medical device. Upto 80 percentage of amputees are not able to afford a prosthesis A prosthetic knee joint is a lower limb artificial device used for above knee or transfemoral amputees along with the aid of other wearables device such as socket pylon and foot It is used to provide mobility and necessary ambulation to its user by achieving normal human GAIT pattern through its passive or active mechanism A normal human GAIT pattern reduces the metabolic cost associated with the walking. A skilled prosthetist decides the type of mechanism settings used in the knee joint device for the rehabilitation period and regular use requirement
Advantages: 360 degree Knee rotation mechanism Variable link length TKA alignment Noise Dampener Geometric feature for link angle orientation Polycentric knee with manual locking Light weight Patient specific stability Integrated form of polycentric and single axis knee joint Extension Bias TKA alignment adaptor and Universal knee joint adaptor can be used Deep squat feature up to 1350 Switchable extension-bias ISO 10328 structural tested simulation Aluminum alloy and nylon 66 material The developed technology has more number of functionalities incorporated within it than any comparable commercially available knee joint It provides a balance between the functionality and cost of the product which is expected to be in the range of 10000 to 13000 INR per piece

    Technology Inputs:

Imported Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Infra red camera 2019-20 90063000
Force plates 2019-20 90319000
EMG sensors 2019-20 90181990
Pressure Mapping mat 2019-20 90189019
laser posture correction device 2019-20 90213900
Video camera 2019-20 90063000
Indigenous Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Computer Desktop 2019-20 84714900
Imported Raw Materials:
Raw Materials Year ITC-HS Code
Nylone 66 2019-20
Aluminium alloy 2019-20
SS screw and nut 2019-20
Indigenous Raw Materials:
Raw Materials Year ITC-HS Code
Existing R&D Facilities used:
Facilities Year ITC-HS Code
Biomedical device and Bio materials laboratory, IIT guwahati NA

    R&D Investment:

R&D investment (Rs. in Lakhs):                    
Indian Source (Rs.) Foreign Source (Rs.) Year
0 0 NA

   Patents & Publications:

Filed Patents (No.) Granted Patents (No.) Year
2147483647 0 2019-20
Submitted (No.) Published (No.) Year
0 0 NA

    Commercialization Potential:

Who are the Potential Licensees? Proactive Technical Orthopedics Pvt. Ltd , endolite
What commercially available products address
the same problem?
Company Product Problem Addressed
Remotion knee Jaipur foot
4F20 knee wonderfull None of the above knees have knee rotation mechanism and anterior posterior alignment adjustment mec
3FM11 knee wonderfull All of the above knees have different size fixed link lengths which provides fixed alpha and beta st
Endolite S400 endolite vInstantaneous center of rotation ICR is fixed for all above commercial knees except endolite knee w
Balance Knee ossur india These knees can satisfy a limited range of trans femoral amputees because of fixed ICR and fixed l
Would you like to develop this invention further with
corporate research support?
Would you be interested in participating in cluster based
programs for commercialization research or business
planning for your invention?
      Submitted by: Jinti Saikia Date of Submission: 5-8-2020

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