Modular Spinal Implant Inserter With Adjustable Depth Stop
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Solution Overview
Problem
Current methods for inserting and fixing implants in the spine lack ease of use, efficiency, and the ability to deploy and remove implants without damaging them, particularly in lumbar interbody fusion procedures.
Innovation Solution
A multi-component system comprising an inserter, jaws, rams, and an adjustable stop for secure implant placement and removal, allowing for axial advancement and rotational fixation, with deployable blades for vertebral body fixation and optional components for safe implant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional implant insertion methods are used, then the implant can be inserted into the spine, but the process is complex and difficult to operate
Solution Approach 1:
The insertion tool is divided into distinct modular components including a handle, shaft, jaw assembly, and deployment mechanism. Each component performs a specific function and can be independently manipulated, making the overall complex device easier to operate through functional segmentation
Solution Approach 2:
The implant is nested within the jaw assembly, which is itself nested within the shaft of the insertion tool. This nested configuration allows the implant to be transported and positioned in a compact state, then deployed sequentially by manipulating the tool components
2Strength
If the implant is securely fixed between vertebral bodies, then stable fixation is achieved, but removal may damage the implant
Solution Approach 1:
The jaw assembly incorporates a deployable mechanism that transitions from a closed gripping state during insertion to an open released state for removal. This dynamic transformation allows the same tool to both securely fix the implant and facilitate its removal without damage
Solution Approach 2:
The insertion tool is designed as a temporary device that performs its function during implant insertion and fixation, then is discarded after use. The implant itself is recovered intact for potential future removal or revision procedures
3Measurement precision
If the implant is inserted precisely at the desired site, then accurate positioning is achieved, but the insertion process requires complex guidance
Solution Approach 1:
A guide wire is inserted and positioned at the desired implant site before the main insertion tool is introduced. This preliminary action establishes the correct trajectory and position, simplifying the subsequent insertion process and eliminating the need for complex real-time guidance systems
Data Source
AI summary
A multi-component implant insertion system for insertion of an intervertebral implant cage and methods of use thereof are described herein. Preferably, the proximal end of a hollow jaw is inserted into the distal end of an inserter. Once inside the inserter, a thread on the jaw engages a corresponding thread inside the inserter, allowing axial advancement of the jaw along the inserter. A ram is inserted through the proximal end of the jaw until the distal end of the ram protrudes at the distal end of the inserter assembly. Optionally, an adjustable stop introduced onto the superior portion of the inserter allows for control over the depth of insertion of the implant. An implant of appropriate size is introduced to the jaw of the inserter assembly and the implant/inserter assembly can be impacted into the vertebral body until the adjustable stop contacts the anterior edge of the vertebral body.