Sensor-Guided Retractor Control for Safe Tissue Retraction
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Solution Overview
Problem
Current retractors lack the ability to monitor and adjust retraction force to prevent tissue damage during surgery, particularly affecting nerve tissues, leading to potential hypoxia and other complications.
Innovation Solution
A retractor system with integrated sensors, such as oximeters and force sensors, that continuously monitor tissue parameters like oxygen saturation and applied force, adjusting retraction force through a closed-loop control mechanism to maintain these parameters within a desired range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If retraction force is increased to hold tissue aside effectively, then retraction effectiveness is improved, but tissue damage risk increases
Solution Approach 1:
The patent implements a closed-loop control system where sensors continuously monitor tissue parameters (such as oxygen saturation levels) and provide feedback to a controller. The controller adjusts the retraction force in real-time based on this feedback, ensuring the force remains within safe limits while maintaining effective retraction. This resolves the contradiction by dynamically balancing retraction effectiveness against tissue damage prevention.
Solution Approach 2:
The system changes the retraction force parameter dynamically based on monitored tissue conditions. When tissue oxygen saturation drops below a threshold, the system automatically reduces retraction force to prevent further deterioration. This parameter adjustment resolves the contradiction by adapting the force level to actual tissue tolerance rather than applying constant maximum force.
2Object-affected harmful factors
If retraction force is monitored continuously to prevent tissue damage, then tissue safety is improved, but device complexity increases
Solution Approach 1:
The retractor device integrates multiple functions into a single system: mechanical retraction, sensor monitoring, signal processing, and automated force adjustment. By making the device universal and multi-functional, the patent reduces the need for separate monitoring and control devices, thereby managing complexity while achieving continuous tissue safety monitoring.
Solution Approach 2:
The patent combines the retraction mechanism, sensing elements, control electronics, and actuation system into an integrated device. This merging of components allows continuous monitoring and automated response within a single device, improving tissue safety without requiring multiple separate systems that would increase overall 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
Minimizes tissue damage by ensuring oxygen saturation and force levels are maintained, reducing the risk of hypoxia and other complications during surgical procedures.
Implementation Method 1
The oximeter sensor measures oxygen saturation level of a retracted tissue
Data Source
AI summary
A retractor system with a closed loop control includes a retractor having one or more sensors, which measure parameters associated with a retracted tissue. The system further includes a positioning mechanism connected to the retractor and a controller which receives feedback signals from the sensors. Based on the feedback signals from the sensors, the retractor is actuated by the positioning mechanism so that the tissue can be retracted while maintaining the parameters associated with the retracted tissue above a threshold level or within a desired range. Another retractor system includes a retractor with a force sensor and at least one additional sensor, which can be used without a closed loop control arrangement.