Lateral Retractor System Minimizing Muscle Damage in Spinal Surgery
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Solution Overview
Problem
Existing lateral surgical approaches to the spine, such as the lateral retractor system, cause significant damage to the musculature and nerves due to compression, crushing, and trapping of soft tissues, leading to complications like ipsilateral upper thigh pain, hip flexor weakness, and nerve damage, with current neuromonitoring methods being inadequate for real-time monitoring during procedures.
Innovation Solution
A lateral retractor system featuring a narrow dilator with opposing flat surfaces and a dual-blade assembly that can be rotated to minimize muscle and nerve damage, combined with continuous 360-degree neuromonitoring capabilities using active neuromonitoring tips integrated into the dilator and blades, allowing for real-time assessment of nerve encroachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lateral surgical approach is used to access the spine, then the surgical pathway can be established, but significant damage occurs to the musculature and nerves due to compression and crushing of soft tissues
Solution Approach 1:
Instead of compressing soft tissues radially outward from the incision site, the patent inverts the approach by inserting the dilator through the psoas muscle parallel to muscle fibers and rotating it to align with the disc space, thereby separating rather than crushing tissues. This inversion of the dilation direction fundamentally reduces harm to surrounding musculature and nerves.
Solution Approach 2:
The patent employs a dynamic insertion process where the dilator is initially inserted parallel to muscle fibers and then rotated during the procedure to align with the disc space. This dynamic adjustment allows the surgical pathway to be established while minimizing static compression damage to soft tissues throughout the procedure.
2Productivity
If sequential circular dilators are used to dilate the surgical site radially, then the surgical pathway can be expanded, but compression of muscle, nerves, and blood supplies occurs leading to pain and weakness
Solution Approach 1:
The patent inverts the traditional radial dilation approach by using a single dilator that is inserted parallel to muscle fibers and then rotated to align with the disc space. This inversion eliminates the need for sequential circular dilators and prevents radial compression of soft tissues while still achieving adequate surgical site expansion.
Solution Approach 2:
The dilation process is segmented into two distinct phases: initial insertion parallel to muscle fibers and subsequent rotation to align with the disc space. This segmentation allows the surgical site to be expanded without causing compression damage, as each phase serves a specific purpose in minimizing harm to surrounding structures.
3Ease of operation
If traditional retractors are placed over the dilator, then the surgical pathway can be maintained, but soft tissues become trapped and crushed near the distal end of the retractor blades
Solution Approach 1:
The patent inverts the retractor blade orientation so that the blades are positioned to prevent tissue trapping rather than allow it. The blades are configured to contact the dilator in a manner that pushes tissues away from the distal end rather than trapping them, fundamentally reversing the harmful effect of traditional retractors.
Solution Approach 2:
The patent converts the potential harm of retractor blades trapping tissues into a benefit by configuring the blades to actively push tissues away from the distal end. The same blade structure that could trap tissues is instead designed to prevent trapping by orienting the blades to direct tissue flow away from critical areas, turning a potential harm into a protective mechanism.
4Measurement precision
If existing neuromonitoring methods are used, then some nerve assessment can be performed, but real-time monitoring during the procedure is inadequate
Solution Approach 1:
The patent implements continuous neuromonitoring that operates throughout the entire surgical procedure rather than providing intermittent or pre-procedure assessment. The neuromonitoring system maintains continuous real-time feedback, allowing immediate detection and response to nerve encroachment or damage, thereby eliminating gaps in monitoring coverage.
Solution Approach 2:
The patent incorporates a feedback mechanism where neuromonitoring data is continuously provided to the surgeon during the procedure. This real-time feedback allows the surgeon to adjust the surgical approach immediately if nerve encroachment is detected, creating a closed-loop system that enhances measurement precision and enables timely intervention.
Data Source
AI summary
A lateral retractor system for forming a pathway to a patient's intervertebral disc space includes a single dilator and a retractable dual-tapered-blade assembly. The dilator may feature a narrow rectangular body for insertion at an insertion orientation parallel to the fibers of the patient's psoas muscle, at an approximate 45-degree angle to the patient's spine. The retractable dual-tapered-blade assembly consists of only two blade subassemblies, each having a blade bordered by adjustable wings, along with built-in lighting and video capabilities. The dual-tapered-blade assembly may be passed over the single dilator at the insertion orientation and rotated approximately 45-50 degrees to a final rotated orientation parallel to the intervertebral disc space before the two blade subassemblies are retracted away from one another to create the surgical pathway, while simultaneously and continuously assessing for encroachment upon one or more nerve structures within 360-degrees of the instrument. Other embodiments are also disclosed.