Eye Surgery Trocar Positioning for Optimal Instrument Angles
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Solution Overview
Problem
Existing eye surgery techniques face challenges in accurately positioning trocars on the sclera to ensure optimal angles of attack for surgical instruments, leading to complications such as vessel perforation, medicament rinsing out, reduced degrees of freedom, and increased operation time and cost due to the need for multiple instruments or repositioning.
Innovation Solution
An eye surgery surgical system that includes a visualization device and a computer unit to calculate and display the optimal position of a trocar point on the sclera based on a patient's eye model, considering ergonomic posture and geometric data of surgical instruments, allowing for multiple possible positions and angles of attack within a tolerance range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stationary trocar is used to introduce surgical instruments, then the trocar provides stable access to the interior of the patient's eye, but the number of degrees of freedom of movement of the surgical tool is reduced
Solution Approach 1:
The system calculates and determines the optimal trocar position before the actual surgical intervention. By pre-calculating the position based on the surgical site location and instrument geometry, the system enables optimal angles of attack to be achieved while maintaining trocar stability during the procedure
2Adaptability or versatility
If multiple surgical instruments are kept available to achieve different angles of attack, then the desired angle of attack can be achieved, but the time required for surgical intervention increases
Solution Approach 1:
The system pre-calculates the optimal trocar position based on the intended surgical instrument and target location. This preliminary calculation allows the surgeon to use a single pre-positioned trocar with the intended instrument, eliminating the need to try multiple instruments or reposition trocars during surgery
Solution Approach 2:
The system creates a digital model of the patient's eye with marked trocar positions and surgical sites. This virtual copy allows pre-planning and optimization of the surgical approach without affecting the actual surgical time
3Reliability
If the hollow needle is placed on the vessel at a steep angle of attack, then the needle can reach the vessel lumen, but the region in which the end of the hollow needle is located in the lumen is very small
Solution Approach 1:
The system calculates the optimal angle of attack as a specific parameter that balances vessel access reliability with maneuverability. By determining the precise angle based on vessel orientation and target location, the system optimizes the balance between reaching the lumen and having sufficient working region
4Object-affected harmful factors
If the hollow needle enters the vessel at a flat angle of attack, then the needle can be safely positioned, but the needle cannot reach the lumen of the vessel
Solution Approach 1:
The system determines the optimal angle of attack parameter that ensures the needle reaches the vessel lumen while minimizing the risk of perforation. The calculation considers vessel orientation, diameter, and target location to find the safe and effective angle
5Productivity
If a trocar is placed without precise positioning, then the surgical procedure can begin quickly, but complications such as vessel perforation and medicament rinsing out occur
Solution Approach 1:
The system performs preliminary calculation of the optimal trocar position before surgery begins. This pre-positioning ensures that the trocar is placed at the correct location and angle from the start, preventing complications while allowing the surgical procedure to proceed efficiently
Solution Approach 2:
The system provides visual feedback by marking the calculated trocar position and surgical site on the displayed image of the patient's eye. This allows the surgeon to verify the planned position before making the actual incision, ensuring accuracy while maintaining surgical efficiency
Data Source
AI summary
An eye surgery surgical system includes a visualization device for visualizing the position of at least one trocar point for a trocar on the sclera of a patient's eye. The trocar serves to introduce a surgical instrument configured for surgical interventions on the fundus of the patient's eye into the patient's eye. The eye surgery surgical system also includes a computer unit which is configured to provide the position of the at least one trocar point to the visualization device. Here, the computer unit contains a trocar point computation routine configured to calculate the position of the at least one trocar point from the location of at least one surgical site in a model of the patient's eye and from geometric data relating to at least one surgical instrument introducible into the patient's eye through the trocar.