Assisted Leg Holding Device For Medical Procedures

1
Assisted Leg Holding Device For Medical
Procedures

• ByJennifer BrunoKatherine EtterGehendra
  Kunwar
• Team 1
• Funded byRehabilitation Education Research
  Center
• Client Contact InformationDr. John D. Enderle

2
Overview

• Introduction
• Purpose
• Requirements
• Research/Work Done By Others
• Final Design
• Subunits
• Future additions
• Budget
• Highlighted Features
• Conclusion/Acknowledgements/Questions

3
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

4
Purpose

• The assisted leg holding device employs
  anti-gravity techniques to balance each patients
  weight, so that the patients legs can be
  positioned effortlessly by a practitioner.

5
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

6
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

7
Patents

• 2714541
• approved in August, 1955
• One of the earliest patents found pertaining to
  this subject, stirrup only supports the patients
  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 patients 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

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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(mgl)/(ab)
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Patients benefiting from this device

• Phylis rheumatoid arthritis, joint stiffness,
  pain
• Jerry Parkinsons 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

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Final Design
Assisted Leg-Holding Device
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• Gravity-Balancing Mechanism

                                                 
WELDED I-HOOK
LINEAR SLIDE
CORD
SPRING
MOTOR
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Motor Stepper Motor
MDrive23 Plus Microstepping
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PIC Microprocessor
PIC16F877
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Foot and Thigh Supports
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Attachment to Table
Pivot and Lock
Aluminum Support
Device
Top View
Front View
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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

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Highlighted Features

• Anti-gravity technology allows the practitioner
  to adjust the position of a patients 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

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Budget
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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

20
Acknowledgements

• RERC-AMI Funding
• Dr. John D. Enderle
• Dave Price
• Rich and Serge
• Dave Kaputa

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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.

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Questions??

• Thank you for your attention!