Hip Implant Positioning Template With Cylindrical Guide Openings
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Solution Overview
Problem
In revision surgery for hip implants, unsupported bone milling is tedious and inaccurate, risking excessive bone removal due to bone defects, which complicates the secure attachment of hip implants and augments.
Innovation Solution
A device comprising a trial hip implant with a template and cylindrical openings allows for precise positioning of a bone screw or milling tool relative to the hip implant, enabling accurate bone treatment and augment attachment by defining positions in multiple axes, facilitating the use of a bone milling device for shaping the bone to match the final hip implant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unsupported bone milling is used to treat bone defects, then the doctor can perform bone treatment, but the process is tedious and inaccurate, risking excessive bone removal
Solution Approach 1:
The patent introduces a positioning device as an intermediary tool between the doctor and the bone milling process. This positioning device includes a template with cylindrical openings that guide positioning devices (such as bone screws or milling tools) to precise locations on the bone. The template acts as a mediator that translates the desired bone treatment plan into accurate physical positioning, eliminating the need for unsupported freehand milling while ensuring precise bone removal only where needed.
2Measurement precision
If a template with cylindrical openings is used to position bone screws or milling tools, then bone treatment accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent divides the positioning system into separate functional components: a template that defines the geometric arrangement of cylindrical openings, positioning devices that fit through these openings, and guide structures that ensure proper alignment. This segmentation allows each component to be optimized independently - the template provides the overall framework while the positioning devices handle the precise bone interaction. The modular approach reduces overall system complexity while maintaining high positioning accuracy.
3Measurement precision
If the trial hip implant is used to define the position of the final hip implant, then the positioning accuracy for bone treatment is improved, but the time required for the procedure increases
Solution Approach 1:
The patent employs a trial hip implant as a preliminary positioning tool that is inserted before the final hip implant. The trial implant serves as a temporary framework that defines the precise positioning for subsequent bone treatment and augment placement. Once the bone is treated and the augment is positioned according to the trial implant's configuration, the trial implant is removed and replaced with the final hip implant. This preliminary action ensures accuracy while the modular nature of the trial implant allows for relatively quick removal and replacement, minimizing overall procedure time.
Data Source
AI summary
A device for attaching a positioning device to a bone of a patient at a predetermined position relative to a hip implant comprising a trial hip implant and a template. The trial hip implant has a support surface for resting on the bone of the patient The template can be secured to the trial hip implant and has at least one cylindrical opening with a longitudinal axis. The trial hip implant is shaped such that any straight line which runs through one of the at least one cylindrical opening and is parallel to the longitudinal axis of the respective opening does not intersect the trial hip implant when the template is secured to the trial hip implant.