Dual-Guiding Instrument Assembly for Dynamic Prostate Positioning
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Solution Overview
Problem
Existing prostate navigation and positioning systems face challenges due to the prostate's mobility and shape changes during procedures, leading to imprecise and cumbersome setups, especially when using fixed reference points.
Innovation Solution
A dual-guiding member assembly with coaxial and parallel guiding holes allows for precise instrument positioning by establishing a reference point through a straight needle, enabling easy alignment and stabilization of surgical instruments relative to the prostate, using imaging techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference point system is used for positioning, then the system structure is simple, but positioning precision deteriorates due to prostate mobility and shape changes
Solution Approach 1:
The system transitions from a fixed reference point to a dynamic reference system where the first reference point moves with the prostate tissue. The first guiding member is positioned at a first location and can be repositioned to a second location, allowing the reference frame to adapt to prostate mobility and shape changes during the procedure, thereby maintaining positioning precision without excessive complexity
Solution Approach 2:
A first reference point is introduced as an intermediary element that is positioned within or relative to the prostate tissue. This intermediary serves as a dynamic anchor that moves with the tissue, enabling accurate tracking and positioning of instruments relative to the moving target without requiring complex external fixation systems
2Measurement precision
If multiple independent positioning devices are used, then positioning precision is improved, but device complexity and cost increase
Solution Approach 1:
The system combines multiple positioning functions into a single integrated assembly. The first guiding member with its first and second reference points, along with the second guiding member having third reference points, are merged into one coordinated system. This allows precise positioning of multiple instruments through a unified structure rather than requiring separate independent positioning devices for each instrument
Solution Approach 2:
The first guiding member serves multiple functions: it provides a first reference point for initial positioning, a second reference point for subsequent positioning, and guides multiple instruments through its structure. The second guiding member similarly provides multiple third reference points. This multi-functionality reduces the need for separate dedicated devices for each positioning task, simplifying the overall system while maintaining precision
3Adaptability or versatility
If independent positioning of template and electrode guiding device is used, then versatility is improved, but ease of operation deteriorates due to difficulty in calculating correct positions
Solution Approach 1:
The system establishes a feedback relationship between the reference points. The position of the second reference point is determined relative to the first reference point, and the third reference points are positioned relative to both. This creates a coordinated reference frame where the position of any guiding member can be calculated from the known positions of the reference points, eliminating the need for complex independent calculations and improving ease of operation while maintaining versatility
Data Source
AI summary
An assembly is disclosed for positioning elongate instruments for percutaneous procedures. The assembly has a first guiding member with a first body, a first guiding hole extending through the first body for receiving a coiled instrument, the first guiding hole having a first axis. The assembly further includes a second guiding hole, wherein the second guiding hole is coaxial with the first guiding hole and has an essentially cylindrical shape. The first guiding hole extends at a periphery of the second guiding hole. A second guiding member has a second body with opposite first and second main surfaces, a third guiding hole having an essentially cylindrical shape and extending through the second body. The second guiding member is attached or attachable to a periphery of the first guiding member such that the third guiding hole has an axis substantially parallel to the first axis.