This innovation focuses on the design of cam to achieve desired torque profile, assembly support plate and minor design modifications for performance enhancement. A prototype is developed and tested for validation of design theory via bench analysis and motion analysis in solid works. The test rig developed can be used to test differently sized Ankle Foot Orthosis (AFO) of articulated and non-articulated types. The rig is capable of applying torque ranging from 0 to 30 Nm.
Figure (1) Physical prototype (2) CAD model
To develop an Ankle Foot Orthosis aid, for people suffering with hemiparesis, that provides both resistive and assistive ankle joint moments as per the gait phase requirement.
- This device provides resistive and assistive torque at the ankle joint tailored to different gait phases.
- It features a cam-based mechanism for varying stiffness for each dorsiflexion (DF) motion and plantarflexion (PF) motion and provision for adjustable physical stops for both DF and PF movement.
- The adjustable stops enhance flexibility and range of motion while ensuring controlled movement to prevent further injury. Thus, it allows precise adjustments to suit individual rehabilitation needs and provide customized support.
- The device features an articulated joint, allowing for more natural ankle movement compared to rigid designs and a free second rocker motion, if required.
- Its portability and non-reliance on external power make it highly convenient and user-friendly, especially for everyday use.
- The integration of spring elements with varying stiffness and the use of rubber blocks for optimal alignment enhance both comfort and functionality.
- This design innovation stores energy and provides the same during the pre-swing phase of gait. This enhances walking efficiency by capturing and releasing energy with each step, reducing the physical effort required from the user.
- Custom fabricated PP cast, standard size of 9 inch
- Non-articulated type, modified to articulate type
- Torque range: 0 to 30 Nm
- Plunger made of MS, spring guide inside housing
- Threaded spring retainer nut for adjusting initial compression
- Rubber blocks for alignment with ankle joint
- Offset cam for torque generation
- Back plate made of PP, attached to cast with Velcro straps
An experimental proof of concept of the invention has been done.
- Advancements in Rehabilitation: This innovation provides affordable and portable physical therapy to every citizen who needs it.
- Affordable: It can be mass produced at a cheaper cost.
- Healthcare and Rehabilitation: The ankle-foot orthosis is a versatile device designed for gait rehabilitation in neurological conditions, providing dynamic flexibility and biomechanical optimization to aid in retraining gait patterns.
- Medical Devices and Orthopedics: For orthopedic support in lower limb injuries, it offers enhanced stability, support, and shock absorption, promoting recovery.
- Elderly and Disability Services: As an assistive device for elderly and disabled individuals, it features an adjustable design and ease of use, ensuring comfort and accessibility.
- Sports and Physical Therapy: In sports and physical therapy, its lightweight materials and compatibility with footwear enable greater mobility and use during training and competitions.
2276/MUM/2015
414392