Safety Broach Guiding Segmented Reamer for Hip Bone Preparation
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Solution Overview
Problem
Current bone preparation instruments for hip replacements, such as broaches and reamers, often result in unintentional bone removal and damage due to unguided reaming processes, which can lead to improper implant fitting and bone integrity issues during minimally invasive total hip arthroplasty.
Innovation Solution
A safety broach system that includes a main body with cutting features like teeth and ribs, guiding a segmented reamer to prevent excessive bone removal by limiting its depth and ensuring precise cavity shaping, thereby enhancing the safety and accuracy of bone preparation for hip implants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reamer is used to create an initial cavity in the bone, then bone material can be removed faster and in a less constrained manner, but the reamer may remove too much bone unintentionally and damage the bone cavity sidewall
Solution Approach 1:
A guide instrument is introduced as an intermediary device that the reamer passes through. The guide instrument has a predetermined shape that constrains the reamer's cutting path, ensuring the cavity is formed with the correct geometry while still allowing the reamer to remove bone efficiently. The guide instrument acts as a mediator between the high-speed bone removal capability of the reamer and the precision requirements of the final cavity shape.
2Ease of operation
If a reamer is used without guidance to travel through the bone cavity, then the reaming process is simpler and faster, but the reamer may cut to a greater depth than intended and compromise bone integrity
Solution Approach 1:
The guide instrument serves as a physical intermediary that limits the reamer's travel depth and path. The reamer is constrained to move only along the guided path defined by the guide instrument, preventing it from cutting beyond the intended depth or deviating from the correct trajectory, thus protecting bone integrity while maintaining operational simplicity.
Solution Approach 2:
The guide instrument is designed with features that prevent the reamer from exceeding safe cutting depths before the actual cutting occurs. By establishing physical boundaries and stop points in advance through the guide instrument's structure, the system prevents potential harm to bone integrity before it can occur during the reaming process.
3Manufacturing precision
If a broach is used to shape and enlarge the cavity, then the cavity can be precisely shaped to match the implant, but multiple broaches must be used sequentially which increases procedure time
Solution Approach 1:
The guide instrument combines multiple broaching functions into a single integrated tool. Instead of requiring sequential use of multiple broaches with progressively larger dimensions, the guide instrument incorporates features that allow it to perform the shaping and enlarging functions in one operation, thereby maintaining precise cavity shaping while significantly reducing the number of steps and overall procedure time.
4Reliability
If a reamer is used to lower the deepest portion of the cavity further into the bone, then additional snugness can be achieved, but the reamer may remove too much bone and damage the cavity sidewall
Solution Approach 1:
The guide instrument acts as an intermediary that controls the reamer's action when lowering the deepest portion of the cavity. The guide instrument's structure defines the maximum depth and lateral boundaries, allowing the reamer to remove bone to achieve the desired snugness while preventing it from cutting too deeply or laterally, thus protecting the cavity sidewall integrity.
Data Source
AI summary
A safety broach for use in arthroplasty for hip joints, and a system including the same. The system may further include a segmented or otherwise flexible reamer and an implant. The safety broach includes a hollow interior passage that serves to guide the reamer when the safety broach is in place in the bone. The system may include any number of sizes of safety broaches, segmented reamers, and implants. In any case, such a safety broach may be capable of assisting with arthroplasty for hip joints (or any other joint), while typically providing enhanced safety and reliability of the arthroplasty.