Spinal Rod Insertion Device with Polyaxial Guide
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Solution Overview
Problem
Existing methods for inserting spinal stabilization rods into bone anchors in minimally invasive surgery are cumbersome and lack flexibility, making the process difficult for operators.
Innovation Solution
A rod insertion device featuring a tubular rod guide, a holding device, and an adapter that allows for movable and pivotable support, with a clamping mechanism enabling polyaxial orientation and release states to facilitate precise placement and orientation of the rod guide within the soft tissue and bone anchors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rod insertion methods are used, then the rod can be inserted into bone anchors, but the process is cumbersome and lacks flexibility
Solution Approach 1:
The rod insertion device is divided into multiple independent components: a rod guide for directing the rod, an adapter for connecting to bone anchors, and a holding device for securing the rod guide. This segmentation allows each component to be optimized independently and assembled in different configurations to suit specific surgical needs, thereby simplifying the overall insertion process while maintaining flexibility.
Solution Approach 2:
The holding device incorporates a clamping mechanism that can dynamically adjust between clamped and released states, allowing the rod guide to be securely held during insertion and then released for rod advancement. This dynamic capability enables the operator to transition smoothly between different operational phases, enhancing ease of operation without increasing device complexity.
2Manufacturing precision
If the rod guide is securely held during insertion, then placement accuracy is improved, but the ability to adjust orientation is reduced
Solution Approach 1:
The clamping mechanism is designed to be dynamically controllable, allowing the operator to switch between a clamped state for secure, accurate placement and a released state for orientation adjustment. This dynamic control resolves the contradiction by providing both precision and adaptability at different stages of the insertion process.
Solution Approach 2:
The rod guide is first secured in the holding device with precise orientation before insertion begins. This preliminary securing ensures accurate placement, and only after the guide is positioned does the operator release the clamp to allow for final orientation adjustments if needed.
3Object-affected harmful factors
If minimally invasive surgery is performed, then tissue damage is reduced, but the insertion process becomes more difficult
Solution Approach 1:
The segmented design allows the rod guide to be inserted through a small incision while the larger holding device and adapter remain outside the body. This segmentation enables minimally invasive insertion of the critical rod-guiding component without requiring large surgical exposures, thereby reducing tissue damage while maintaining ease of operation through the external manipulation of the holding device.
Data Source
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AI summary
A rod insertion device (1, 1') for inserting a spinal stabilization rod (95) into at least two bone anchors (901, 901') comprises: a first tubular rod guide (6) configured to guide the spinal stabilization rod (95) therethrough, and a holding device (3, 3') configured to hold the rod guide, an adapter (2) configured to be connected to an extension (9), which is configured to be mounted to a receiving part (90) of the bone anchor (901), and configured to movably support the holding device; wherein, when the adapter is connected to said extension, the holding device is arranged to move and pivot the rod guide to allow a front portion (64) of the rod guide to be positioned proximal to a rod channel of the receiving part; wherein the holding device includes a clamping portion (5, 5') arranged to clamp a portion (61) of the rod guide, and to allow releasing the portion of the rod guide at least in a state wherein the front portion of the rod guide is positioned proximal to the rod channel of a first receiving part of a first bone anchor, wherein an orientation of the rod guide in the released state may be polyaxially corrected in respect of a second receiving part (90') of a second bone anchor (901').