Retractor Light Guide Faceted Surfaces Surgical Illumination
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Solution Overview
Problem
Existing illumination systems for surgical procedures, particularly during minimally invasive surgery, face limitations such as overhead lighting that requires direct exposure and frequent adjustments, head-mounted fiber optic systems that restrict mobility and cause fatigue, and inefficient light delivery through fiber bundles, which result in inadequate and uneven illumination.
Innovation Solution
A surgical illumination system featuring a retractor with a light guide having faceted surfaces that direct light towards the surgical field, minimizing the need for overhead lighting and reducing eye fatigue by ensuring uniform illumination with high efficiency, using a light guide that can be securely attached to various retractor types and configured to adapt to different surgical fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If overhead lighting systems are used, then illumination of the surgical field is provided, but frequent adjustments are required and the lighting is inadequate for deeper cavities
Solution Approach 1:
The patent combines the retractor and illumination system into a single integrated device. The light guide is positioned on the retractor blade, allowing the illumination source to move with the retractor and maintain optimal positioning without requiring separate adjustments of overhead lights during the procedure.
Solution Approach 2:
The patent introduces a light guide as an intermediary component that delivers light from a remote source directly to the surgical field through the retractor. This light guide acts as a mediator that overcomes the limitations of both overhead lighting and direct head-mounted systems.
2Illumination intensity
If head mounted fiber optic systems are used, then illumination of the surgical field is provided, but the surgeon is tethered by the light cord and experiences head and neck fatigue
Solution Approach 1:
The patent extracts the light source from the surgeon's head and relocates it to a fixed position away from the surgical field. Only the lightweight light guide remains on the retractor, eliminating the need for the surgeon to wear a head-mounted system with cords, thereby restoring full mobility and eliminating head and neck fatigue.
3Illumination intensity
If fiber bundles are used for light delivery, then light can be delivered to the surgical field, but tremendous inefficiencies occur with approximately 10% loss per foot of cable
Solution Approach 1:
The patent replaces the inefficient fiber bundle mechanical system with a light guide that uses optical principles of total internal reflection. This substitution eliminates the need for long fiber optic cables and their associated losses, achieving greater than 65% light delivery efficiency by directing light through a controlled path along the retractor.
4Illumination intensity
If fiber-based illumination devices are positioned on top of the retractor, then direct illumination of the surgical field is achieved, but the devices get in the way and occupy valuable work space
Solution Approach 1:
The patent positions the light guide on the top surface of the retractor blade, utilizing the vertical dimension rather than extending laterally into the surgical field. This dimensional placement allows the illumination device to provide direct illumination without occupying valuable lateral work space or interfering with surgical instruments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides efficient, adaptable, and uniform illumination, reducing the need for frequent adjustments and minimizing light loss, with improved mobility and reduced eye fatigue for surgeons, achieving greater than 65% light delivery efficiency compared to traditional fiber-based systems.
Implementation Method 1
the distally oriented surface of said facets, ridges, steps or shoulders are angle relative to the axis of the light guide and the location of the surgical field such that light passing through the light guide is emitted and directed toward the surgical field
Implementation Method 2
a portion of the distal surface adapted to face the surgical field is faceted with a plurity of facets, ridges, steps or shoulders
Data Source
AI summary
An apparatus for the efficient provision of directed illumination to a subdermal surgical field that is attachable to or completely forms a surgical retractor blade. This illuminated surgical retractor system may include a retractor and a light guide disposed over the retractor. The retractor has a front surface facing a surgical field, a rear surface adapted to engage tissue, a distal end, and a proximal end. The light guide conforms to the shape of the retractor and is removably secured to the retractor and conducts light through the front or rear surface of the retractor. The light guide has an input adaptor and one or more light emitting surfaces.