Vitreoretinal Viewing Control to Prevent Corneal Contact During Focusing
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Solution Overview
Problem
The risk of the vitreoretinal viewing system's front piece contacting and potentially damaging the eye during ophthalmic surgical procedures, especially when the optics carrier is moved and the microscope lens lacks internal focus, necessitating a solution to maintain the front piece's position stationary relative to the microscope support.
Innovation Solution
A microscope motion controller that computes and maintains the front piece's target position stationary with respect to the microscope support, compensating for the optics carrier's movement by counter-movement of the front piece, ensuring v=−w, allowing simultaneous movement of both the optics carrier and the front piece to prevent eye contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the optics carrier is moved for focusing/zooming, then the microscope can perform surgical procedures on the posterior segment of the eye, but the front piece may contact and damage the cornea of the eye
Solution Approach 1:
The motion controller continuously receives carrier position signals representing the actual position of the optics carrier and uses this feedback information to compute and adjust the front piece target position in real-time, ensuring the front piece remains stationary relative to the microscope support while the optics carrier moves for surgical procedures
Solution Approach 2:
The motion controller acts as an intermediary device that decouples the movement of the optics carrier from the front piece position. It receives positioning signals for the optics carrier, computes the corresponding front piece target position, and sends counter-movement commands to the front piece drive system, thereby preventing direct contact between the front piece and the eye
2Adaptability or versatility
If the front piece is pivoted into the optical path for vitreoretinal viewing, then surgical procedures on the posterior segment can be performed, but the risk of corneal contact and damage increases
Solution Approach 1:
The system dynamically adjusts the front piece position based on the optics carrier position. The motion controller continuously computes the front piece target position using the relationship between carrier target position and carrier actual position, enabling the front piece to dynamically counter-move and maintain a stationary position relative to the microscope support, thus ensuring eye safety while maintaining vitreoretinal viewing capability
3Ease of operation
If the microscope lens lacks internal focus and must be moved as a whole, then focusing can be achieved, but the front piece movement control becomes more complex
Solution Approach 1:
The motion controller automatically computes the front piece target position based on the carrier positioning signal and carrier position signal without requiring manual intervention. The system self-regulates by using the relationship between optics carrier position and front piece position to generate appropriate counter-movement commands, simplifying operation while managing the complexity through automated computation
Data Source
AI summary
The invention relates to a microscope (1), in particular an ophthalmic surgical microscope having a vitreoretinal viewing system (6), an optics carrier (14) and a support (2). The invention also relates to a method and a motion controller controlling the movement of the vitreoretinal viewing system (6). The optics carrier (14) is attached movably to the support (2). The vitreoretinal viewing system (6) in turn is attached movably to the optics carrier (14). The vitreoretinal viewing system (6) comprises a front piece (30), such as a optics carrier (14). To avoid contact of the front piece (30) with an eye (16) while the optics carrier (14) is moved for focusing a microscope lens (18), the position of the front piece (30) is automatically maintained stationary with respect to the support (2). This is obtained by controlling the vitreoretinal viewing system (6) to perform a counter movement to the movement of the optics carrier (14).