Ophthalmic Pressure Control via Fluid Impedance Calibration
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Solution Overview
Problem
Existing ophthalmic pressure control systems face challenges in accurately controlling infusion fluid pressure during surgical procedures, leading to instability in intraocular pressure due to variations in fluid flow caused by surgical acts, which existing systems struggle to compensate for effectively.
Innovation Solution
The system performs a fluid calibration process to determine the fluid impedance of the ophthalmic irrigation module, using a kit of parts with a second calibration device to improve pressure control accuracy and stability, allowing for pre-defined set points to be maintained during surgery, even when the actual surgical device is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fluid pressure sensor is used to control infusion fluid pressure, then pressure control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a calibration device that replicates the fluid pathway and impedance characteristics of the actual surgical irrigation device. By measuring fluid pressure and flow through this calibrated copy, the system can determine system impedance without needing direct pressure sensors in the eye or complex real-time sensing in the surgical field, thus improving measurement accuracy while avoiding the complexity of invasive sensing.
Solution Approach 2:
The calibration device acts as an intermediary between the pressure regulator and the surgical irrigation device. It provides a controlled environment to characterize fluid impedance without requiring direct integration of pressure sensors into the surgical pathway, thereby achieving accurate pressure control characterization without the complexity of invasive sensing systems.
2Adaptability or versatility
If the ophthalmic irrigation module is used directly for both surgical use and calibration, then device versatility is improved, but measurement precision of fluid impedance deteriorates
Solution Approach 1:
The system is divided into separate functional components: a surgical irrigation device for actual eye surgery and a separate calibration device for fluid impedance measurement. This segmentation allows each component to be optimized for its specific function - the surgical device for versatility in surgery and the calibration device for precise measurement control - thereby resolving the contradiction between versatility and measurement precision.
Solution Approach 2:
The calibration device creates a precise copy of the surgical irrigation device's fluid pathway characteristics. This copy allows accurate measurement of fluid impedance under controlled conditions without requiring the actual surgical device to be used for calibration, thereby maintaining both the versatility of the surgical device and the measurement precision needed for accurate calibration.
3Productivity
If calibration is performed with the surgical device in place, then surgical disruption is minimized, but measurement precision of fluid response deteriorates
Solution Approach 1:
The calibration device provides a controlled replica of the surgical irrigation system that can be used for precise fluid response measurements without interfering with ongoing surgery. This copy allows accurate characterization of fluid impedance and system response under standardized conditions, thereby maintaining surgical efficiency while improving measurement precision that would be compromised if calibration were performed with the actual surgical device in place.
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 approach enables stable intraocular pressure control by accurately estimating fluid response and compensating for pressure losses, minimizing surgical disruptions and maintaining pre-defined pressure settings during surgical procedures.
Implementation Method 1
a fluid pressure regulator having an input port and an output port, an infusion line having a proximal end and a distal end, the proximal end being connected to the output port of the pressure regulator
Implementation Method 2
the control unit is arranged for performing a fluid calibration process including a step of determining a fluid impedance of the ophthalmic irrigation module
Data Source
AI summary
The invention relates to an ophthalmic pressure control system, comprising: a pressure regulator having an input port and an output port, and an infusion line having a proximal end and a distal end, the proximal end being connected to the output port of the pressure regulator, and the distal end being detachably connected to an ophthalmic irrigation module. Further, the system includes a control unit driving the pressure regulator for controlling an infusion fluid pressure at a distal end of the ophthalmic irrigation module. The control unit is arranged for performing a fluid calibration process including a step of determining a fluid impedance of the ophthalmic irrigation module. The infusion line is associated with a kit of parts including a first and a second ophthalmic irrigation device, or the ophthalmic irrigation module is an ophthalmic irrigation device for surgical use.