Fluorescence Imaging Probe with 45-Degree Dichroic Filter
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Solution Overview
Problem
Existing portable and lightweight handheld open surgical imaging systems face limitations in effective working distance due to non-uniform excitation light power density, which affects imaging quality.
Innovation Solution
A fluorescence imaging probe with a dichroic filter arranged at a 45° included angle with the main optical axis of incident excitation light, allowing the incident excitation light to be reflected and coaxial with the image detector, thereby expanding the working distance and improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If oblique illumination or ring-shaped LED illumination is used, then the device can be made portable and lightweight, but the effective working distance is limited and excitation light power density becomes non-uniform
Solution Approach 1:
A beam combining optical component is introduced as an intermediary element to merge the excitation light path and fluorescence detection path into a single coaxial configuration. This optical mediator enables the handheld probe to achieve uniform excitation light distribution and extended working distance while maintaining portability, resolving the contradiction between device lightweight design and imaging quality reliability
2Length of stationary object
If the working distance is increased, then more surgical field can be observed, but excitation light power density becomes non-uniform
Solution Approach 1:
The beam combining optical component acts as an optical intermediary that maintains uniform excitation light power density across the surgical field even at extended working distances. By integrating the excitation and detection paths coaxially through this intermediary component, the system achieves both increased working distance and uniform illumination intensity distribution
3Ease of operation
If the excitation light beam is offset from the central uniform area, then a light guide system can be used, but excitation light power density within the field of view becomes non-uniform
Solution Approach 1:
The beam combining optical component serves as an intermediary that eliminates the need for offset light guide systems. By integrating the excitation light path with the detection path in a coaxial configuration through this optical intermediary, uniform excitation light power density is achieved across the entire field of view while maintaining ease of operation
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 proposed solution enhances imaging quality by ensuring better alignment of excitation and fluorescence axes, thereby expanding the effective working distance and improving the overall performance of the fluorescence imaging probe.
Implementation Method 1
a dichroic filter and an image detector, the dichroic filter is arranged at an included angle of 45° with a direction of a main optical axis of incident excitation light, the incident excitation light is reflected by the dichroic filter to a target detection position
Implementation Method 2
the reflected incident excitation light excites a fluorescent substance at the target detection position to form fluorescence
Implementation Method 3
the incident excitation light is emitted by a laser device and transmitted to the dichroic filter through optical fiber
Implementation Method 4
the diverging element is configured to diffuse a divergence angle of the incident excitation light
Implementation Method 5
the dodging lens is configured to homogenize the diffused incident excitation light
Implementation Method 6
an optical adapter is further provided at the light emergent side of the dichroic filter, and the fluorescence passes through the dichroic filter, and is incident to the image detector after being converged by the optical adapter
Data Source
AI summary
Provided are a fluorescence imaging probe and a handheld imaging prober, relating to the technical field of medical devices. The fluorescence imaging probe includes a dichroic filter and an image detector, the dichroic filter is arranged at an included angle of 45° with a direction of a main optical axis of incident excitation light, the incident excitation light is reflected by the dichroic filter to a target detection position, the reflected incident excitation light excites a fluorescent substance at the target detection position to form fluorescence, a main optical axis of the fluorescence is arranged coaxially with the image detector, the fluorescence is incident to the image detectors through the dichroic filter, and the image detector converts the received fluorescence into an image signal.