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Fetal Stabilizer for Intrauterine Surgery

Developed to assist in surgery for Spina Bifida, this fetal stabilizer holds the fetus steady, allowing for open repair procedures while minimizing damage to the spinal cord. The device is designed with varying adjustability for different fetal sizes, eliminating the need for retaining hooks and ensuring simplicity in use.

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Fetal Stabilizer for Intrauterine Surgery

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  1. BME 273Fetal Stabilizer for Intrauterine Surgery Michael Dinh Advisor: Dr. Joseph Bruner

  2. One of the most common debilitating neural tube defect Incomplete closure in the spinal column usually in the lower section during initial pregnancy. Spina Bifida affects approximately 1 out of every 1,000 newborns in the U.S Spina Bifida

  3. Degree of Spina Bifida • Spina Bifida Occulta • Spina bifida occulta is a small gap in one or more of the vertebrae. This is the mildest form of spina bifida as there is no apparent damage to the spinal cord. • Meningocele • Meninge (protective layer covering the spinal cord) protrudes through the gap in the spinal column in a form of a sac. The spinal cord itself remains intact and repairs can be made with little or no damage. Least common occuring form. • Mylemeningocele • Most severe form. This term is generally used interchangeably with spina bifida. Spinal cord itself protrudes through the gap in the spinal column.

  4. Spina Bifida Manifesta • Protrusion of spinal cord membrane, spinal cord, and nerve roots • Spinal cord exposure result in progressive damage • Most often found in the lumbo-sacral region

  5. Adverse Affect • Hydrocephalus • Accumulation of spinal fluid in brain is common among infants with spina bifida • Permanent weakness or paralysis in lower extremity below defect • Loss of bowel and bladder control due to the nerve damage

  6. Vanderbilt University • 165 cases of spina bifida repair • Age range of infants 19-30 weeks • Mean operating time is about 87 min • Ranges from 62-131 min

  7. Design Objective • Design a fetal stabilizer to assist in surgery • Hold fetus steady while providing an opening for operation

  8. Approach • Observe open repair of spina bifida • Collect fetal biometrical data • Look at similar device in handling fetus • Simpson Forceps: Used in delivery

  9. Fetal Data • 19 week old fetus • 6 inches head to end • Weight about 8.5 ounces • Abdominal Circumference about 133 mm • Width about 60 mm

  10. Device Design Top View Front View Side View

  11. Overall Length: 20 cm Depth of Paddle Arm: 6 cm Width of Paddle Arm: 4 cm Width of device: 7.5 cm Space b/w Arm Center: 6 cm Space b/w Arm bottom: 5 cm Width of opening: 5 cm Length of opening: 7 cm Side handle about 45 mm in length Device Specification

  12. Conclusion • Design stabilizes fetus using forces present • Contracting uterine wall force & fetal outward force • Facilitate in operation • No need for retaining hooks • Simple in use • Two piece device • Varying degree of adjustability for variation in fetal size

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