Blade Guide Block for Faster Collared Stem Revision Removal
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Solution Overview
Problem
Existing joint revision surgery methods are invasive, time-consuming, and often result in significant blood loss, longer operating room times, and increased morbidity due to the complexity of removing prosthetic implants, particularly collared femoral stems.
Innovation Solution
A surgical apparatus featuring a blade guide block with adjustable L-shaped guide plates and a central cavity that secures over the trunnion end of the existing prosthesis, using various knife blades to efficiently remove the implant by aligning with the femur's side surfaces and minimizing bone contact, facilitated by a T-handle screw for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional joint revision surgery methods are used to remove existing prostheses, then the prosthesis can be removed, but the surgery becomes invasive, time-consuming, and results in significant blood loss
Solution Approach 1:
The blade guide block is pre-positioned on the prosthesis before removal, with knife blades already aligned in the correct positions. This preliminary setup eliminates the need for complex intraoperative adjustments and accelerates the removal process while maintaining control.
Solution Approach 2:
The surgical instrument is divided into modular components: a blade guide block that attaches to the prosthesis, multiple interchangeable knife blades for different cutting needs, and a T-handle screw for secure attachment. This segmentation allows rapid configuration and simplifies the overall surgical procedure.
2Loss of time
If traditional methods are used to remove collared femoral stems, then the implant can be extracted, but operating room time increases and morbidity increases
Solution Approach 1:
The blade guide block serves as an intermediary device that bridges the surgeon's tools and the prosthesis to be removed. It provides precise alignment and support for the knife blades, making the removal of difficult-to-extract collared stems straightforward and reducing operating time.
Solution Approach 2:
The instrument system is designed to be dynamically adaptable during surgery. The blade guide block can be securely attached and detached, and different knife blades can be exchanged based on the specific prosthesis being removed, allowing the surgeon to optimize the approach for each case.
3Loss of substance
If existing prosthesis removal techniques are used, then the implant can be extracted, but blood loss increases and recovery time extends
Solution Approach 1:
The knife blades are designed to make precise, localized cuts at the interface between the prosthesis and bone. This focused cutting action minimizes disruption to surrounding healthy tissue and reduces blood loss, while the efficient design maintains high surgical productivity.
Data Source
AI summary
The present application is directed a Joint Revision Surgery Apparatus which includes a surgical knife blade guide block which has a plurality of rearward blade guide slots, a central cavity and a plurality of guide slots having a two-way adjustable L-shaped guide plate. The surgical knife blade guide block central cavity houses a stem trunnion securing member and is positioned over the trunnion end of the existing prosthesis to be removed and secured to the prothesis. The guide blade block is secured to the trunnion of the prosthesis to be extracted using a stem trunnion securing member housed within the guide block. Straight, curved and compound curved knife blades are guided by the blade guide slots to cut the prothesis free. The Joint Revision Surgery Apparatus facilitates rapid, efficient and complete removal of an existing prosthesis during joint revision surgery, and significantly increases positive medical outcomes for joint revision procedures.