Surgical Retractor with Pressure and Timing Feedback
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Solution Overview
Problem
Traditional surgical retraction methods often cause tissue necrosis and prolonged recovery due to excessive pressure and prolonged tissue retraction, leading to increased recovery time, scarring, and pain.
Innovation Solution
A retractor system equipped with pressure sensors and timers that monitor and display the pressure and time of tissue retraction, allowing surgeons to adjust the retraction to avoid excessive pressure and prolonged contact, thereby minimizing tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional surgical retraction methods are used to access surgical sites, then adequate tissue retraction and surgical access are achieved, but tissue necrosis and prolonged recovery occur due to excessive pressure and prolonged contact time
Solution Approach 1:
The patent applies feedback by implementing pressure sensors that continuously monitor the force applied by the retractor on tissue and provide real-time feedback to the control system. This allows the system to automatically adjust the retraction force to remain within safe thresholds, preventing tissue necrosis while maintaining adequate surgical access. The feedback loop ensures that the harmful effect (excessive pressure) is continuously detected and corrected.
Solution Approach 2:
The patent changes the parameter of pressure application by using controlled force limits and time-based protocols. The system dynamically adjusts the retraction pressure parameters based on tissue type, surgical location, and duration of application. This parameter control prevents the transition from safe retraction to harmful compression that causes necrosis.
2Ease of operation
If excessive pressure is applied by the retractor to achieve adequate tissue retraction, then surgical access is improved, but localized cell necrosis and bruising increase
Solution Approach 1:
Pressure sensors embedded in the retractor provide continuous feedback on the force applied to tissue. The control system receives this feedback and automatically adjusts the retraction force to maintain it within safe thresholds, preventing the excessive pressure that leads to localized cell necrosis and bruising while still achieving adequate tissue retraction for surgery.
Solution Approach 2:
The system dynamically adjusts retraction pressure in real-time based on feedback from pressure sensors and timing information. Rather than applying static excessive pressure, the system modulates the force dynamically to maintain effectiveness while preventing tissue damage, adapting to changes in tissue properties and surgical conditions.
3Productivity
If retraction is maintained for extended periods to facilitate complex procedures, then surgical completeness is achieved, but recovery time increases due to prolonged tissue stress
Solution Approach 1:
The timing component provides feedback on the duration of retraction application. When the retractor has been in place for a predetermined period, the system automatically alerts the surgeon or reduces the retraction force, preventing prolonged tissue stress that extends recovery time while still allowing sufficient time for complex surgical procedures to be completed.
Solution Approach 2:
The system implements periodic monitoring and adjustment of retraction force based on elapsed time. Rather than continuous maximum retraction, the system uses periodic assessments of duration to determine when to reduce or redistribute retraction force, allowing surgical procedures to proceed while minimizing cumulative tissue stress and subsequent recovery time.
4Object-affected harmful factors
If minimally invasive techniques are used to reduce tissue dissection, then initial trauma is reduced, but damage to retracted tissue still occurs due to pressure application
Solution Approach 1:
The patent applies feedback through pressure sensors that monitor the force exerted on retracted tissue during minimally invasive procedures. This feedback enables real-time adjustment of retraction force to prevent damage to the tissue being held, ensuring that the benefits of minimal initial trauma are not offset by pressure-induced damage during the procedure.
Solution Approach 2:
The system changes the pressure parameters applied to retracted tissue by using lower, more controlled force levels compared to traditional open surgery. The control system adjusts these parameters dynamically based on tissue response and duration, maintaining adequate retraction for minimally invasive access while preventing the pressure-related damage that can occur even with reduced dissection.
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 reduces tissue necrosis, shortens recovery time, and decreases post-operative pain by ensuring that pressure is applied within safe limits and for minimal durations.
Implementation Method 1
at least one pressure sensor for actuating sensing pressure applied to tissue being retracted and for generating a sensor signal representative of the pressure
Data Source
AI summary
A retractor system for percutaneous surgery in a patient includes first and second retractor portions positionable opposite one another in an incision of the patient. The system also includes at least one actuating member operable to provide an oscillating motion to at least one of the first and second retractor portions. The actuating member is in communication with a controller and is responsive to the controller to move and adjust at least one of the first and second retractor portions between a first position and a second position. The system also includes at least one pressure sensor and display and at least one timing circuit with display. In another form, a method is directed to retracting tissue for percutaneous access to a surgical site in a patient using the pressure sensors and display as will as the timing circuit and display to assure that the amount of pressure applied and the duration does not exceed pre-determined values.