Modular Tissue Retractor for Controlled Spinal Access
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Solution Overview
Problem
Existing surgical retractors lack the flexibility and configurability needed for various spinal surgical approaches, particularly for anterior, lateral, and oblique techniques, and do not provide controlled tissue retraction and dilation.
Innovation Solution
A modular retractor system comprising a primary and secondary retractor assembly with adjustable blades and pinion gear mechanisms for precise control over arm movement and blade angulation, allowing for customizable and controlled tissue retraction and dilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-configured retractor is used, then the device structure is simple, but it cannot adapt to various spinal surgical approaches (anterior, lateral, oblique techniques)
Solution Approach 1:
The retractor system is divided into a primary retractor assembly and a secondary retractor assembly that can be used independently or combined. Each assembly has its own actuation mechanism, allowing modular configuration for different surgical approaches while maintaining manageable complexity through functional separation.
Solution Approach 2:
The retractor blades are made dynamically adjustable through independent actuation mechanisms. The primary actuator controls the primary assembly while the secondary actuator controls the secondary assembly, enabling real-time reconfiguration during surgery to adapt to different approaches (anterior, lateral, oblique) without requiring a completely different device.
2Manufacturing precision
If traditional retractors are used, then the device is simple to manufacture, but they do not provide controlled tissue retraction and dilation
Solution Approach 1:
Traditional manual mechanical retraction is replaced with an actuated system using pinion gear mechanisms. The primary actuator and secondary actuator provide controlled mechanical advantage to precisely position the blades, enabling controlled tissue retraction and dilation while maintaining manufacturability through standardized mechanical components.
Solution Approach 2:
Pinion gear mechanisms serve as intermediary elements between the actuators and the retractor arms. These intermediaries translate actuator motion into precise blade positioning, providing controlled tissue retraction without requiring direct complex mechanisms in each blade, thus balancing precision with ease of manufacture.
3Adaptability or versatility
If a single retractor assembly is used, then the device is simpler to operate, but it lacks the flexibility and configurability for enhanced surgical access
Solution Approach 1:
The control system is segmented into a primary actuator for the primary retractor assembly and a secondary actuator for the secondary retractor assembly. This segmentation allows independent control of each assembly, providing flexibility to adjust only the necessary portion for the specific surgical approach while keeping the overall operation manageable through modular control.
Solution Approach 2:
The retractor system is designed with universal functionality where the primary and secondary assemblies can be used independently or combined. The actuators and pinion gear mechanisms provide multi-functional control, enabling the same system to handle anterior, lateral, and oblique approaches, thereby enhancing configurability without proportionally increasing operational 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
Enables highly customizable and controlled access to surgical sites, facilitating precise surgical procedures by providing enhanced flexibility and stability during spinal surgeries.
Implementation Method 1
A primary pinion gear mechanism is operably coupled to the first and second handles and is configured to open and close the first and second blades along the first path upon actuation of the primary actuator
Implementation Method 2
The first and second pivoting members are configured to independently angulate the first and second blades, respectively
Data Source
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AI summary
A retractor system for enabling access to a surgical site is disclosed. The retractor system may include a primary retractor assembly configured to open and close a first arm and a second arm along a first path of travel. The primary retractor assembly may include a handle assembly having first and second handles configured to open and close the first and second arms, and the first and second arms may be operably coupled to first and second blades, respectively. The retractor system may further include a secondary retractor assembly configured to couple and uncouple with the primary retractor assembly and independently extend and contract a third arm and optionally a fourth arm. The third arm and optional fourth arm may be operably coupled to third and fourth blades, respectively. The inclination of each blade may be independently adjusted and each arm may also be independently moved.