Proximal Reamer Guided by Distal Stem for Hip Arthroplasty
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Solution Overview
Problem
Current hip arthroplasty procedures are lengthy and complex, leading to increased surgical complications due to the need for multiple steps and instruments, particularly in revision surgeries where bone loss and instability are concerns, and existing tools do not efficiently allow for precise bone resection and implant alignment.
Innovation Solution
A reamer system that uses the distal implant as a guide for proximal reaming, reducing the number of steps and instruments required by allowing the distal stem implant to support the reaming process, enabling more precise bone removal and alignment without the need for additional trials or tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate instruments and trial components are used for bone resection and implant alignment, then measurement precision and alignment accuracy can be improved, but device complexity and surgical procedure time increase
Solution Approach 1:
The patent combines multiple separate instruments (reamer, alignment guide, trial component) into a single integrated implant stem with attached alignment features. The stem includes proximal alignment features that directly provide orientation guidance without requiring separate trial components or external alignment devices, thereby reducing the number of instruments while maintaining alignment precision.
Solution Approach 2:
The implant stem serves multiple functions simultaneously: it acts as the final implant, provides alignment guidance through integrated features, and eliminates the need for separate trial components. The alignment features are built into the stem itself, making the stem a universal tool that performs both implantation and alignment functions.
2Measurement precision
If multiple trial components and instruments are used, then implant positioning accuracy can be improved, but loss of time and surgical complexity increase
Solution Approach 1:
The alignment features are pre-integrated into the implant stem during manufacturing, eliminating the need for time-consuming intraoperative assembly of separate trial components. The stem arrives in the operating room already equipped with functional alignment features, allowing immediate positioning without preliminary trials.
Solution Approach 2:
By merging the alignment guide function into the implant stem itself, the patent eliminates the sequential steps of inserting trial components, performing alignment measurements, removing trials, and then inserting the final implant. These functions are combined into a single implantation action, significantly reducing surgical time.
3Manufacturing precision
If separate reaming and alignment tools are used, then bone resection precision can be improved, but the number of steps and instruments required increases
Solution Approach 1:
The patent merges the reaming function and alignment guidance function into a single integrated system. The implant stem with its attached alignment features directly guides the reaming process, eliminating the need for separate reaming tools followed by separate alignment trials. The alignment features are positioned to provide real-time guidance during bone resection.
Data Source
AI summary
A method for providing joint arthroplasty includes resecting an end portion of a long bone, preparing a central longitudinal opening in a medullary canal of the long bone, providing a prosthetic stem component, installing the prosthetic stem component into the opening in a medullary canal, providing a reamer including an opening for receiving the prosthetic stem component, positioning the reamer onto the prosthetic stem component with the opening of the reamer positioned at least partially over the prosthetic stem component, reaming a portion of the long bone with the reamer, removing the reamer, and installing a prosthetic body component onto the prosthetic stem component.