Assisted leg holding device for medical procedures
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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

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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


Foot and Thigh Supports


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


Budget


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!


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