Design and Prototype Fabrication of a UCSD Photonics Neonatal Video - - PowerPoint PPT Presentation

▶

Nov 13, 2022 804 likes •964 views

Design and Prototype Fabrication of a UCSD Photonics Neonatal Video Laryngoscope Katherine Baker and Joseph Ford University of California, San Diego Jacobs School of Engineering Wade Rich and Neil Finer University of California, San Diego

SLIDE 1

UCSD Photonics

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Photo: Kevin Walsh, OLR

University of California, San Diego Jacobs School of Engineering

Design and Prototype Fabrication of a Neonatal Video Laryngoscope

Katherine Baker and Joseph Ford

October 15, 2009

Wade Rich and Neil Finer

University of California, San Diego Medical Center

SLIDE 2

UCSD Photonics

Introduction / Motivation

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Dr. Neil Finer, Chief of the UCSD Medical Center’s Division of Neonatology, and

Wade Rich, Research Coordinator for the Division of Neonatology, approached the Photonic Systems Integration Lab with a collaboration proposal.

25,000 extremely low birth weight infants born annually,
Most require intubation, a difficult / traumatic process for neonates
Current instruments designed for adults, not infants, esp. not neonates.
Project goal: Working model of a neonatal video laryngoscope.

SLIDE 3

UCSD Photonics

Infant Intubation

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

85 - 90% of extremely low birth weight infants need intubation. Intubation requires 3 (average) to 10 tries Multiple attempts lead to serious risks.

Images from Manual of Emergency Airway Management, ed. Murphy and People’s Daily Online

SLIDE 4

UCSD Photonics

Laryngoscopes

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Our goal was to create a working model neonatal video laryngoscope to evaluate the feasibility of a commercial device.

Images are from Karl Storz website, GlideScope website

Traditional Laryngoscopes

GlideScope: Video Camera Karl Storz: Coherent Fiber Bundle

Video Laryngoscopes

SLIDE 5

UCSD Photonics

Blade and Device Constraints

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Constraints

Blade Width
2.5mm by 6.5 mm tip
Variable Blade Angle
Image Quality
Combination of Imager and Lighting
Mechanical Properties
Strength
Heat
Texture

SLIDE 6

UCSD Photonics

Imager Selection

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

We identified a promising camera in the Medigus IntroSpicio CCD Video Camera, with a camera head measuring only 1.8 by 1.8 by 12 mm.

Effective Focal Length .712 mm Field of View 100° F-number f/5.99

2 4 6 8 10 12 14 16 18 20 40 60 80 Spatial Frequency (in Line Pairs per mm) Distance in mm

Maximum Resolvable Frequency

Given Resolution Measured Vertical Resolution Measured Horizontal Resolution 0.2 0.4 0.6 0.8 1 1.2 50 100 150 200 Contrast Spatial Frequency (Line Pairs per mm)

Modulation Transfer Function

Measured MTF for Vertical Lines Measured MTF for Horizontal Lines Average Measured MTF Given MTF Image from Medigus website

SLIDE 7

UCSD Photonics

Design Solutions

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

The most elegant solution is a tapered acrylic light pipe acting as the blade. We make use of a Fraen coupling lens. With a necessary optical power of at least 30 to 40 mW, an LED at the tip would dissipate far too much heat. Calculated efficiency is just over 50%.

Image from Fraen website

SLIDE 8

UCSD Photonics

Waveguide Fabrication

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Acrylic blanks are cut at the right aspect ratio. The edges are sanded, then flame-polished with a hydrogen-oxygen torch. Blanks are heated to pliability, then stretched to form a taper

SLIDE 9

UCSD Photonics

Measured efficiency is 28%, but the LED is bright enough that this is sufficient.

Assembly and Optical Testing of Initial Model

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Using an Inova X0 LED flashlight as the handle and light source, we created a working model. Ideal Backlit Target 1 cm 4 cm LED/Waveguide Lit Target

SLIDE 10

UCSD Photonics

The medical team tested the device

n a Premi-Blue Neonatal Simulator

(Gaumard).

Medical Testing and Feedback

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

SLIDE 11

UCSD Photonics

Final Model

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

SLIDE 12

UCSD Photonics

Final Model Videos

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

SLIDE 13

UCSD Photonics

Conclusions and Future Directions

Neonate anatomy guided our design.
We met all the constraints of the project.
Less expensive wafer cameras could be used to reduce cost.
We would need a sterilizable device to perform a clinical trial
Further modifications could be made

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

SLIDE 14

UCSD Photonics

10/26/200 9

PHOTONIC SYSTEMS INTEGRATION LABORATORY – UCSD JACOBS SCHOOL OF ENGINEERING

Thank you

kabaker@ucsd.edu