Retractor System with Oximeter and Force Sensor for Tissue Protection
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Solution Overview
Problem
Current tissue retractors in medical procedures lack the ability to monitor and adjust the force applied to tissues in real-time, leading to potential damage during surgery, particularly affecting nerve tissues which can result in permanent sensory or motor deficits.
Innovation Solution
A retractor system equipped with sensors, such as oximeters and force sensors, connected to a controller that adjusts the retraction force based on measured parameters like oxygen saturation and force applied, ensuring the tissue remains within a healthy range during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current retractors are used to hold aside tissue during surgery, then the surgeon can gain access to the surgical area, but the tissue may be damaged due to inability to monitor retraction force
Solution Approach 1:
The patent incorporates sensors (force sensors, oximeters) that provide real-time feedback on retraction force and tissue oxygen saturation levels. This feedback loop allows the system to monitor tissue condition continuously and adjust retraction force accordingly, preventing tissue damage while maintaining surgical access. The controller processes sensor data and automatically adjusts the retractor force to keep tissue within safe parameters.
Solution Approach 2:
The patent replaces purely mechanical retractors with an intelligent system that uses sensors and controllers to monitor and adjust retraction force. Instead of relying solely on manual mechanical adjustment, the system uses electronic sensing and control mechanisms to automatically regulate the force applied to tissue, substituting mechanical intuition with precise electronic measurement and control.
2Ease of operation
If retraction force is increased to improve surgical access, then better visibility is achieved, but tissue damage risk increases
Solution Approach 1:
The system uses real-time feedback from force sensors and oximeters to monitor both the retraction force applied and the resulting tissue oxygen saturation. When tissue integrity thresholds are approached or oxygen saturation drops, the system automatically adjusts the retraction force downward, maintaining optimal visibility while protecting tissue. This closed-loop control ensures reliability by preventing excessive force application.
Solution Approach 2:
The patent dynamically changes the retraction force parameter based on real-time tissue condition monitoring. The controller adjusts force levels according to feedback from sensors, modifying the mechanical parameter (force) to maintain tissue integrity while achieving sufficient surgical exposure. This adaptive parameter adjustment resolves the contradiction between visibility and tissue protection.
3Reliability
If sensors are added to the retractor system to monitor tissue condition, then tissue damage is prevented, but device complexity increases
Solution Approach 1:
The retractor system is designed with multi-functionality, combining mechanical retraction, force sensing, oxygen saturation monitoring, and automatic control in a single integrated device. The sensor array and controller serve multiple purposes: monitoring tissue health, regulating retraction force, and providing surgical feedback. This universal design reduces overall system complexity by consolidating functions rather than requiring separate devices.
Solution Approach 2:
The patent merges the retractor mechanism with sensing elements and control systems into an integrated unit. The force sensors and oximeters are incorporated directly into the retractor structure, and the controller is unified with the mechanical system. This merging of components reduces the number of separate devices needed and simplifies the overall system architecture while maintaining comprehensive tissue protection capabilities.
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
The system minimizes tissue damage by continuously monitoring and adjusting the retraction force, maintaining tissue health and reducing the risk of complications such as hypoxia and structural damage.
Implementation Method 1
an oximeter sensor... The oximeter sensor measures an oxygen saturation value of a retracted tissue
Data Source
AI summary
A retractor system includes a retractor with an oximeter sensor at its tip and a force sensor coupled to the retractor. The retractor system also includes a system unit which can send signals to and receive signals from the oximeter sensor via optical fibers. The oximeter sensor measures oxygen saturation of a tissue being retracted by the retractor, and the force sensor measures an amount of force that is applied to the retracted tissue by the tip of the retractor. Another retractor system has a closed loop control arrangement with a positioning mechanism which moves the retractor based on measurements of the sensors.