Sacroiliac Fusion Implant With Deployable Bone-Spike Locking
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Solution Overview
Problem
Existing sacroiliac joint fusion surgeries face challenges in achieving effective stabilization and minimizing recovery time while maintaining some degree of mobility, as current methods often result in complete immobilization and prolonged healing.
Innovation Solution
A sacroiliac fusion implant device with a sliding block and movable bone spikes that deploy and lock into the sacroiliac joint, utilizing a threaded post to extend spikes for secure fixation and a dual locking mechanism to prevent retraction, allowing for controlled deployment and integration with bone tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete immobilization is achieved through traditional sacroiliac joint fusion, then pain and instability are reduced, but recovery time is prolonged and joint mobility is completely eliminated
Solution Approach 1:
The implant incorporates movable bone spikes that can transition from a retracted position during insertion to an deployed position for fixation. This dynamic mechanism allows the implant to adapt during surgery and provide controlled stability, reducing the need for complete immobilization while maintaining fusion reliability.
Solution Approach 2:
The implant changes the state of bone spikes from retracted to deployed through rotational movement of the threaded post. This parameter change enables controlled deployment of spikes into bone tissue, providing gradual stabilization that reduces recovery time while maintaining fusion integrity.
2Reliability
If complete immobilization is achieved through traditional sacroiliac joint fusion, then pain and instability are reduced, but joint mobility is completely eliminated
Solution Approach 1:
The movable bone spikes provide a dynamic fixation system that can be deployed or retracted as needed. This allows the implant to provide stability when required while potentially allowing controlled mobility, thus maintaining adaptability and versatility in the sacroiliac joint.
Solution Approach 2:
The ability to change the deployment state of bone spikes allows the implant to adapt between different functional states - providing firm fixation when stability is needed and allowing controlled movement when mobility is beneficial, thus resolving the contradiction between stability and adaptability.
3Reliability
If bone spikes are deployed for secure fixation, then fusion stability is improved, but the risk of spike retraction increases
Solution Approach 1:
The bone spikes are extracted from the implant body through the sliding block mechanism and deployed into the bone tissue. This separation allows the spikes to be independently positioned and secured in the bone, reducing the risk of retraction while maintaining fixation security.
Solution Approach 2:
The threaded post is rotated to deploy the bone spikes into the bone tissue before final fixation is achieved. This preliminary deployment action ensures that the spikes are securely positioned in the bone before the implant is fully assembled, reducing the risk of subsequent retraction.
4Reliability
If traditional sacroiliac joint fusion is performed, then pain and instability are reduced, but the surgical complexity and recovery process are prolonged
Solution Approach 1:
The implant is segmented into distinct components including the implant body, movable bone spikes, sliding block, and threaded post. This segmentation allows each component to perform its specific function independently, simplifying the surgical procedure while maintaining effective pain relief and fusion stability.
Solution Approach 2:
The dynamic mechanism of the sliding block and movable bone spikes allows the implant to be inserted and activated through a single rotational motion of the threaded post. This dynamic operation reduces surgical complexity compared to traditional multi-step fusion procedures while achieving reliable pain relief.
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
The implant device provides stable fusion with reduced risk of spike retraction, facilitating quicker recovery and potentially preserving some joint mobility, while ensuring secure fixation and minimizing complications.
Implementation Method 1
The proximal end has a cannulated threaded post configured to receive a guide pin and to move a sliding block. The sliding block is movable from a retracted unlocked position and to a deployed locked position when moved toward the distal end as the threaded post is rotated clockwise.
Implementation Method 2
The first exterior surface and the second exterior surface have a plurality of gripping ridges configured to engage bone or tissue upon implantation, wherein the plurality of gripping ridges are inclined from the distal end towards the proximal end at an angle of 45 degrees or less.
Data Source
AI summary
A sacroiliac fusion implant device assembly has an implant body with a sliding block and a pair of movable bone spikes. The distal end has a tapered end with an opening configured to receive a guide pin during insertion into a joint between a sacrum and an ilium, and the proximal end has a cannulated threaded post configured to receive a guide pin and to move a sliding block. The sliding block is movable from a retracted unlocked position and to a deployed locked position when moved toward the distal end as the threaded post is rotated clockwise. The bone spikes are movable from a retracted position in the implant body to an exposed deployed locked position by moving the sliding block which presses the spikes up and out of the retracted position extending the bone spikes into bone in the sacroiliac joint.