Surgical Retraction Device with Oscillating Load for Tissue Trauma Reduction
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Solution Overview
Problem
Current surgical retraction methods cause significant tissue trauma due to the application of large forces during deformation and holding phases, leading to complications such as fractures, muscle tears, and ischemia, which often exceed the trauma from the medical procedure itself.
Innovation Solution
The development of retraction devices with paired opposed retraction members and drive mechanisms that provide continuous, smooth deformation, constant force, automated control for imminent fracture detection, and features like tissue cooling and pharmacologically active compound elution to minimize trauma, along with oscillating loading and self-balancing mechanisms to accommodate tissue creep and reduce force requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional retraction devices apply large forces to deform and hold tissue, then the retraction effect is achieved, but significant tissue trauma occurs including fractures, muscle tears, and ischemia
Solution Approach 1:
The patent applies periodic oscillating loads to the tissue during retraction instead of continuous static force. The retraction device alternates between loading and unloading phases, which reduces peak stress on tissues while maintaining sufficient retraction effect. This periodic action allows tissues to relax between loads, preventing ischemia and reducing the risk of fractures and muscle tears.
Solution Approach 2:
The invention transitions from static retraction force to dynamic, time-varying force application. The drive mechanism continuously adjusts the retraction force based on real-time tissue response, oscillating between compression and relaxation cycles. This dynamic approach accommodates tissue creep and viscoelastic properties, reducing peak forces required while maintaining retraction effectiveness.
2Duration of action of stationary object
If retraction devices hold tissue at deformation for extended periods, then the retraction effect is maintained, but ischemia and tissue damage increase
Solution Approach 1:
During the holding phase, the device continues to apply periodic oscillating loads rather than maintaining constant static force. This periodic unloading allows blood flow to resume in retracted tissues, preventing ischemia while maintaining the retraction effect. The oscillation continues throughout the holding period, ensuring tissues receive periodic oxygenation.
Solution Approach 2:
The useful retraction action continues throughout the holding phase through continuous oscillation, rather than stopping entirely. The drive mechanism maintains periodic loading and unloading cycles during the holding period, ensuring that the retraction effect is sustained while simultaneously preventing ischemia through continuous blood flow promotion.
3Device complexity
If manual retraction methods are used, then device complexity is low, but force control precision and detection of imminent fracture are insufficient
Solution Approach 1:
The retraction device incorporates sensors that continuously monitor tissue response, force levels, and retraction progress. This feedback information is fed to a control system that automatically adjusts the oscillation parameters and force application in real-time. The feedback mechanism enables precise force control and early detection of imminent fracture, preventing tissue damage while maintaining retraction effectiveness.
Solution Approach 2:
The patent replaces manual mechanical operation with automated control systems that use electronic sensors and computer algorithms. The drive mechanism is controlled by a microprocessor or microcontroller that processes sensor data and adjusts motor output accordingly. This substitution of mechanical control with automated electronic control enables precise force regulation and real-time detection of tissue stress patterns indicating imminent fracture.
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
These devices reduce tissue trauma by minimizing peak forces, accommodating viscoelastic properties of tissues, and detecting impending fractures, thereby decreasing post-surgical pain and complications associated with traditional retraction methods.
Implementation Method 1
OSCILLATING LOADING TO MINIMIZE TISSUE TRAUMA DURING SURGICAL PROCEDURES
Implementation Method 2
accommodating viscoelastic properties of tissues
Implementation Method 3
tissue cooling
Data Source
AI summary
Methods and devices are disclosed to reduce the tissue trauma that occurs when a physician retracts or otherwise deforms a patient's tissues for surgery or other medical procedures. In one part, methods and devices are disclosed for controlling the force and pace of retraction to reduce tissue trauma. In another part, methods and devices are disclosed for applying an oscillating load when opening. In another part, pads that cool the tissue around the incision are disclosed. In another part, pads that elute drugs into the tissues of the tissue margin are disclosed. In another part, methods and devices are disclosed that self-align components of the retractor and engage hard tissues directly to avoid soft tissue damage. In another part, pads that engage tissues to cushion, to sense tissue state, and to modulate tissue state are disclosed.