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Assisted Leg Holding Device For Medical Procedures. By: Jennifer Bruno Katherine Etter Gehendra Kunwar Team 1 Funded by: Rehabilitation Education Research Center Client Contact Information: Dr. John D. Enderle. Overview . Introduction Purpose Requirements Research/Work Done By Others
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Assisted Leg Holding Device For Medical Procedures By:Jennifer BrunoKatherine EtterGehendra Kunwar Team 1 Funded by:Rehabilitation Education Research Center Client Contact Information:Dr. John D. Enderle
Overview • Introduction • Purpose • Requirements • Research/Work Done By Others • Final Design • Subunits • Future additions • Budget • Highlighted Features • Conclusion/Acknowledgements/Questions
Introduction • In the United States, about 51.2 million people are disabled • Leg holding devices are required for many medical procedures • Important for patients to have a positive experience as to keep up with preventative screenings and to reduce anxiety • Problems with traditional leg-holding devices. • Lack of adjustability, patients outside the “normal” range • Practitioners have difficulty positioning patients who are overweight or have severe disabilities
Purpose The assisted leg holding device employs anti-gravity techniques to balance each patient’s weight, so that the patient’s legs can be positioned effortlessly by a practitioner.
Requirements • Comfortable • Versatile (can be used by a wide variety of patients) • Adhere to medical standards • Low cost • Compact and easy to relocate • Easy to sterilize • Not imposing or intimidating • Durable and reliable
Product Research • Allen YellofinTM Lithotomy Stirrups • intra-operative re-positing of patients • mimics natural motion of the hip • prevents excessive pressure on the calf • Accommodates patients up to 500 lbs
Patents • 2714541 • approved in August, 1955 • One of the earliest patents found pertaining to this subject, stirrup only supports the patient’s foot • extremely compact and can be easily stored to maximize space within the operating room • 4809687 • approved in September 1989 • cushioned shell that supports a patient’s foot and lower leg • accommodates for patients with joint or muscle disease • 5802641 • approved in September 1998 • can be adjusted to support a patient against gravity • uses a motorized system
A Useful Paper: “A Simple Technique to Passively Gravity-Balance Articulated Mechanisms” Link Free Body Diagram Total Potential Energy Must Equal Zero! Substituting and solving… Spring Constant K=(m*g*l)/(a*b)
Patients benefiting from this device: • Phylis rheumatoid arthritis, joint stiffness, pain • Jerry Parkinson’s disease, tremor, rigidity, and decreased range of motion • Jamie T11 spinal cord injury • Betty limited and asymmetrical lower extremity range of motion, limited strength in her right leg, pain caused by her hip • Violet short stature • Paul two below-the-knee amputations
Final Design Assisted Leg-Holding Device
Gravity-Balancing Mechanism WELDED I-HOOK LINEAR SLIDE CORD SPRING MOTOR
Motor – Stepper Motor MDrive23 Plus Microstepping
PIC Microprocessor PIC16F877
Attachment to Table Pivot and Lock Aluminum Support Device Top View Front View
Future Additions • Scale with Bluetooth capabilities to transmit patient weight to PIC for automatic adjustment • Automatic braking system to lock the device in place during a medical procedure
Highlighted Features • Anti-gravity technology allows the practitioner to adjust the position of a patient’s leg in a “weightless” environment • Device is adjustable for patients weighing up to 300 pounds • Device is adjustable for a patient leg range of 20 inches to 44 inches • Device is adjustable for a variety of leg positions from fully bent to fully extended • Device is adjustable for a variety of leg positions from close together to widely spread • Device can be removed from table and stored when not in use • Medical drapings allow the device to be sterilized easily between procedures • Adjustable, Velcro-secured foot and knee supports allow for extra comfort and support during procedures and can accommodate amputees
Conclusion • The proposed design - provides full leg support to disabled patients -offers an easy solution for practitioners who are unable to comfortably adjust patients - allows a wide range of adjustability to ensure patient comfort and procedure integrity
Acknowledgements RERC-AMI Funding Dr. John D. Enderle Dave Price Rich and Serge Dave Kaputa
References • www.census.gov/PressRelease/www/releases/archives/facts_for_features_special_editions/010102.html • T. Rahman, R. Ramanathan, R. Seliktar, and W. Harwin, "A Simple Technique to Passively Gravity-Balance Articulated Mechanisms," J Mech. Des. vol. 117, pp. 655-658, 1995.
Questions?? Thank you for your attention!