Variable Duty Cycle Vitrectomy Cutter Cam Mechanism
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Solution Overview
Problem
Conventional vitrectomy probes lack the ability to continuously vary operational parameters, making them less efficient for delicate ophthalmic surgeries where precision is crucial, especially when cutting and removing tissue near the retina.
Innovation Solution
A vitrectomy probe with a variable duty cycle cutting mechanism, featuring a motor-driven cam driver with a non-planar surface and a follower mechanism that transitions between different radii to change the duty cycle, allowing for continuous adjustment of the cutting mechanism's operation from a higher to a lower duty cycle without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional vitrectomy probes with fixed duty cycle are used, then the device structure is simple, but the adaptability to different surgical conditions is poor
Solution Approach 1:
The patent implements a dynamic duty cycle adjustment mechanism where the cam driver can be rotated to different angular positions, each corresponding to a different duty cycle setting. This allows the cutting mechanism to dynamically adapt between high-duty cycle (aggressive cutting) and low-duty cycle (delicate tissue management) modes during surgery, resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The patent changes the operational parameter (duty cycle) by physically rotating the cam driver to different angular positions. Each angular position alters the timing relationship between the cutting member actuation and the port opening/closing, thereby changing the duty cycle. This parameter change approach enables adaptability without requiring complex electronic controls or multiple interchangeable components
2Manufacturing precision
If conventional vitrectomy probes with fixed operational parameters are used, then the device is easy to operate, but the precision for delicate tissue management is insufficient
Solution Approach 1:
The patent enables dynamic switching between high-duty cycle mode (for efficient vitreous removal) and low-duty cycle mode (for delicate tissue management near the retina). The surgeon can adjust the cam driver angular position to select the appropriate cutting precision level, thereby improving precision for delicate tissue management while maintaining ease of operation through a simple mechanical adjustment
3Productivity
If conventional vitrectomy probes are used, then the device complexity is low, but the surgical efficiency for varying tissue types is reduced
Solution Approach 1:
The patent implements a dynamic duty cycle adjustment mechanism that allows the surgeon to optimize cutting efficiency for different tissue types and surgical conditions. By rotating the cam driver to different angular positions, the system can switch between aggressive cutting (high duty cycle) for bulk vitreous removal and delicate cutting (low duty cycle) for membrane dissection, thereby improving surgical efficiency without requiring multiple separate devices
Solution Approach 2:
The patent makes a single vitrectomy probe device capable of performing multiple cutting functions by adjusting the cam driver angular position. The same cutting member and port assembly can operate in different duty cycle modes, enabling the device to handle various tissue types (vitreous, membranes, fibrotic tissue) with a single multi-functional instrument, thus improving productivity without proportionally increasing device complexity
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 more efficient surgeries by allowing surgeons to adjust the duty cycle on-the-fly, reducing tissue disruption near the retina and potentially lowering surgical costs by improving precision and efficiency.
Implementation Method 1
a cam driver rotationally driven by the motor. The cam driver has a non-planar driver surface having surface features that vary at different radii. A follower mechanism is arranged to selectively interface with the driver surface at different radii on the driver surface
Data Source
AI summary
A vitrectomy probe having a variable duty cycle cutting mechanism is disclosed. The probe includes a motor and a cam driver rotationally driven by the motor. The cam driver has a non-planar driver surface having surface features that vary at different radii. A follower mechanism is arranged to selectively interface with the driver surface at different radii on the driver surface in a manner to selectively interface with the varied surface features at the different radii. The follower is arranged to transfer rotational movement of the cam driver into linear movement of the follower mechanism.