Tenodesis Implant With Push Rod Guide For Accurate Tendon Fixation
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Solution Overview
Problem
Minimally invasive tenodesis techniques face challenges in accurately securing tendons to bones due to issues with tendon placement and fixation, leading to potential instability and longer recovery times compared to open surgical methods.
Innovation Solution
A novel anchoring device comprising a first stage implant and a second stage fixation member, where the implant removably engages a push rod to guide the tendon into a pre-drilled bore, and the fixation member is installed over the push rod to securely pin the tendon against the bore's bottom surface, ensuring proper tendon placement and fixation without the need for threading through an eyelet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If minimally invasive techniques are used for tenodesis procedures, then soft tissue trauma and recovery time are reduced, but tendon placement accuracy and fixation stability deteriorate
Solution Approach 1:
The fixation system is divided into multiple components: a push rod for tendon insertion, an implant with straddle for tendon positioning, and a fixation member for securing. This segmentation allows each component to perform its specific function optimally while maintaining minimally invasive benefits
Solution Approach 2:
The push rod is used to preliminarily position the tendon and implant within the bore before the fixation member is installed. This preliminary action ensures proper tendon placement accuracy before final fixation, resolving the contradiction between minimally invasive approach and placement precision
2Strength
If interference fit screw fixation is used to anchor tendon to bone, then fixation strength is improved, but tendon placement control and stability deteriorate
Solution Approach 1:
The tendon is preliminarily positioned and secured against the bottom surface of the bore using the push rod and implant straddle before the fixation member is installed. This preliminary positioning ensures stable tendon placement that maintains accuracy throughout the fixation process
Solution Approach 2:
The implant with straddle acts as an intermediary between the tendon and the fixation member. The straddle captures and holds the tendon in proper position, while the push rod maintains positioning force during fixation member installation, ensuring both strength and stability
3Manufacturing precision
If a two-stage anchoring device is used with push rod and fixation member, then tendon placement accuracy and fixation stability are improved, but device complexity increases
Solution Approach 1:
The push rod, implant with straddle, and fixation member are designed to work together as an integrated system. The push rod attaches to the implant, and the fixation member installs over both components, merging multiple functions into a coordinated assembly that improves precision without excessive complexity
Solution Approach 2:
The push rod serves multiple functions: guiding tendon insertion, positioning the implant, and maintaining positioning force during fixation. The implant with straddle provides both structural support and tendon capture. This multi-functionality reduces the need for separate specialized components, managing device complexity
Data Source
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AI summary
A tendon anchoring device may include an implant having a pair of spaced apart legs for straddling a tendon. A push rod removably attached to the implant may be utilized to guide and push a portion of the tendon into a pre-drilled bore in a bone. A fixation member may be slid along the push rod and threadably engage an inner surface of the pre-drilled bore to thereby anchor the tendon to the bone while a force is applied to the push rod. Once the fixation member has been installed, the push rod may be disengaged from the implant and removed from the bore. The implant may remain permanently straddled over the tendon inside of the bore.