Expandable Bone Implant for Single-Opening Bone Harvesting
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Solution Overview
Problem
During minimally invasive surgical procedures, creating two openings in the pelvis for both percutaneous pin attachment and bone harvesting is undesirable due to increased wound risk and potential destabilization of the percutaneous pin, affecting the accuracy of image-guided procedures.
Innovation Solution
A bone implant with an expandable member that anchors to the bone and provides stability before, during, and after bone harvesting, allowing for bone collection through a single opening, reducing the number of wounds and maintaining procedural accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a percutaneous pin is attached to the ilium via disposal within an opening created in the ilium, then the navigation reference frame can be anchored for image-guided procedures, but creating an additional opening for bone harvesting increases wound risk and complicates procedure management
Solution Approach 1:
The patent combines the percutaneous pin attachment function and bone harvesting function into a single integrated device. The pin serves dual purposes: anchoring the navigation reference frame and providing access for bone harvesting through its hollow structure, thereby eliminating the need for a separate incision and reducing overall wound risk
Solution Approach 2:
The percutaneous pin is designed as a multi-functional device that simultaneously performs navigation anchoring and bone harvesting access. The hollow body of the pin allows bone material to be collected through the same opening used for pin insertion, making the device universal for both functions
2Device complexity
If bone harvesting is performed through the same opening used for percutaneous pin attachment, then the number of wounds is reduced, but the percutaneous pin becomes destabilized causing inaccuracy in image-guided procedures
Solution Approach 1:
The pin structure is segmented into distinct functional zones: a navigation reference frame attachment area at the proximal end and a bone harvesting access area at the distal end. This segmentation allows bone harvesting activities to occur at the distal end without interfering with the proximal anchoring function, maintaining pin stability
Solution Approach 2:
The hollow body of the pin acts as an intermediary channel that guides bone harvesting instruments through the pin structure to the bone site. This intermediary pathway allows bone collection without requiring external manipulation that would destabilize the pin, as all bone harvesting actions occur through the controlled internal lumen
3Measurement precision
If the percutaneous pin is made stable for navigation, then image-guided procedure accuracy is maintained, but the ability to harvest bone through the same opening is limited after pin removal
Solution Approach 1:
The pin is designed with a hollow structure that anticipates and prepares for future bone harvesting needs. The hollow body is pre-configured to accept bone harvesting instruments, allowing bone collection to occur through the same stable pin structure that maintains navigation accuracy throughout the procedure
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 bone implant stabilizes the percutaneous pin and allows for bone harvesting through a single opening, minimizing wound risk and maintaining procedural accuracy by preventing rotation and ensuring precise navigation.
Implementation Method 1
An expandable member contacts at least one of the head, tip or body and is movable from an unexpanded configuration to an expanded configuration when deployed at a bone implant site
Implementation Method 2
An anchoring element contacts at least one of the head, tip or body and is configured to fix the bone implant to a bone implant site
Data Source
AI summary
In some embodiments, a bone implant for percutaneous use is provided. The bone implant comprises a head, a body adjacent to the head and a tip opposite the head. At least the head, body or tip is configured to contact bone. An expandable member contacts at least one of the head, tip or body and is movable from an unexpanded configuration to an expanded configuration when deployed at a bone implant site. In some embodiments, a system for percutaneous bone harvesting is provided.