Variable Polarization Medical Illuminator
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Solution Overview
Problem
Existing hand-held medical illuminators with polarization features, such as the DermLite Platinum, require manual manipulation of a dial to switch between cross-polarization and parallel-polarization modes, which can disrupt the viewing process and lack the ability for instantaneous switching, and do not allow for incremental control of intermediate polarizations.
Innovation Solution
A hand-held illumination device with a microprocessor-controlled system that uses a pulse generator and drivers to adjust the intensity of LEDs, allowing for variable polarization without mechanical rotation of polarizers, using a dial with an optical encoder to detect movement and adjust light intensity for both cross-polarized and parallel-polarized light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual dial manipulation is used to switch between cross-polarization and parallel-polarization modes, then the device can provide polarization switching capability, but the viewing process is disrupted and instantaneous switching is not achieved
Solution Approach 1:
The patent replaces the manual mechanical dial system with an electronic control system using a pulse generator and driver circuitry. The pulse generator produces pulsed voltages that are inverted by an inverter circuit to independently control the intensity of cross-polarized and parallel-polarized LEDs, enabling instantaneous polarization mode switching without mechanical manipulation during viewing.
Solution Approach 2:
The patent employs pulsed voltage control where the pulse generator produces periodic pulsed voltages to drive the LEDs. By adjusting the pulse width and frequency, the system can dynamically control the intensity of polarized light sources, enabling rapid switching between polarization modes and intermediate states without mechanical movement.
2Adaptability or versatility
If manual dial rotation is used to control polarization, then the device can provide polarization adjustment, but incremental control of intermediate polarizations is not achieved
Solution Approach 1:
The patent replaces the mechanical dial rotation system with an electronic pulse width modulation system. The pulse generator and driver circuitry provide precise electronic control over LED intensity, enabling incremental adjustment of polarization states through digital control parameters rather than mechanical rotation, thereby achieving intermediate polarization control without complex mechanical mechanisms.
3Adaptability or versatility
If separate control of cross-polarized and parallel-polarized light intensity is implemented, then variable polarization is achieved, but the control system becomes more complex
Solution Approach 1:
The patent segments the polarization control into two independent control paths: one for cross-polarized LEDs and one for parallel-polarized LEDs. Each path has its own driver circuit controlled by inverted versions of the same pulsed voltage signal, allowing independent intensity adjustment of each polarization type while maintaining a unified control architecture through the inverter relationship.
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
Enables seamless and incremental control of polarization states, allowing for enhanced viewing of skin structures at different depths without manual interference, improving the efficiency and accuracy of medical examinations.
Implementation Method 1
a first polarizer arranged to polarize light emitted from the first set of one or more LEDs in a first polarization direction
Implementation Method 2
a second polarizer arranged to polarize light emitted from the second set of one or more LEDs in a second polarization direction
Implementation Method 3
a viewing polarizer arranged to polarize the light collected from the organic tissue in the second polarization direction
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A device for variable polarization by an illumination device for illuminating organic tissue. The device includes a first set of one or more light emitting diodes (LEDs), a first polarizer arranged to polarize light emitted from the first set of LEDs in a first polarization direction, a second set of one or more LEDs, a second polarizer arranged to polarize light emitted from the second set of LEDs in a second polarization direction. A lens is arranged to collect light from organic tissue illuminated by the first and/or second sets of LEDs including a viewing polarizer arranged to polarize the light collected from the organic tissue in the second polarization direction. A signal generator is operable to signal one or more drivers for driving one of the first and second sets according a signal value and driving the other of the first and second sets according to an inverse value thereof.