Optical Coherent Tomography Shutter Control for Tissue Safety
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Solution Overview
Problem
Optical coherent tomography diagnosis apparatuses face challenges in minimizing exposure to measuring light, particularly near-infrared rays, which are invisible and can cause unintended biological tissue illumination, especially when the light source takes time to stabilize and when the optical probe is not rotating, leading to potential tissue damage and exposure risks.
Innovation Solution
The apparatus incorporates a shutter or frequency shifter control system that only allows measuring light emission when the catheter is connected and the optical probe is rotating, ensuring light is not emitted unless the system is ready for diagnosis, thereby reducing unnecessary exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light source is activated beforehand to ensure stable light supply, then the light stability is improved, but the measuring light illuminates continuously causing harmful exposure to biological tissue
Solution Approach 1:
The light source is activated in advance before the catheter is inserted into the blood vessel, ensuring that stable light is available when needed. The shutter control mechanism is pre-positioned to block the light path, and upon catheter insertion detection, it automatically opens to allow light emission, thus combining preliminary activation with controlled release.
Solution Approach 2:
A shutter control mechanism acts as an intermediary between the light source and the biological tissue. The shutter selectively blocks or permits light transmission based on catheter insertion status, mediating the interaction between the activated light source and the potential harmful exposure to tissue.
2Object-affected harmful factors
If the shutter control mechanism is added to control light emission, then the harmful exposure is reduced, but the device complexity increases
Solution Approach 1:
The shutter control mechanism operates automatically based on the detection of catheter insertion status. The system self-regulates light emission without requiring manual intervention, reducing operational complexity while maintaining safety control.
Solution Approach 2:
The shutter control is linked to the catheter insertion detection system, creating a feedback loop where the insertion status automatically triggers the appropriate shutter state. This feedback mechanism simplifies control by eliminating the need for separate manual switching.
3Measurement precision
If the measuring light intensity is increased to improve image clarity, then the tomographic image quality is improved, but the risk of biological tissue damage increases
Solution Approach 1:
The measuring light is emitted in periodic pulses rather than continuously. The light source activates briefly during catheter insertion and data acquisition, then shuts off, providing sufficient illumination for imaging while minimizing cumulative exposure and potential tissue damage.
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
This solution effectively minimizes biological tissue exposure to measuring light, ensuring safer operations and reducing the risk of tissue damage by controlling light emission based on the catheter connection and probe rotation status.
Implementation Method 1
measuring light is light-emitted in the blood vessel while rotating the optical mirror, and radial scanning is carried out by receiving reflected light from biological tissue. A tomographic image of the blood vessel is created based on the coherent light
Implementation Method 2
A tomographic image of the blood vessel is created based on the coherent light by making interference between the obtained reflection light and reference light divided from the measuring light beforehand
Implementation Method 3
an optical coherent tomography diagnosis apparatus which utilizes wavelength-sweeping for an improvement type of optical coherent tomography diagnosis apparatus... a catheter with a built-in optical lens and an optical fiber mounted with an optical mirror at the distal tip
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
An image diagnostic apparatus includes a probe capable of light transmission and reception, wherein a reflection light in a coelom is obtained from the probe by scanning the probe rotatingly in the coelom, and a tomographic image in the coelom is formed and outputted based on the obtained reflection light. A light-shield is provided to shield the light transmitted to the probe, a connection detector detects whether or not the probe is connected, and a controller controls the light-shield based on a detected result by the connection detector.