Centric Needle Channel Adjustment in Stereotactic Instrument Guide
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Solution Overview
Problem
Existing medical instrument guides, particularly for puncture needles, face challenges with reduced stereotactic accuracy during repeated operations due to the need for frequent adjustments with different needle diameters, leading to increased complexity, cost, and reduced precision, as well as difficulties in rapid needle release.
Innovation Solution
A simple and variable instrument guide featuring coupled guide jaws with adjustable clamping force and smooth slots for precise centric adjustment, allowing easy switching between needle sizes without shifting the target axis, and incorporating quick-release mechanisms for emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple guide sleeves are used for different needle diameters, then adaptability is improved, but device complexity increases
Solution Approach 1:
The guide jaw is divided into a fixed portion and a movable portion that can independently adjust. The movable portion can be shifted along the guide jaw to accommodate different needle diameters, while the fixed portion maintains the overall guide structure. This segmentation allows the single guide jaw to adapt to multiple needle sizes without requiring multiple separate guide sleeves.
Solution Approach 2:
The guide jaw incorporates a movable portion that can dynamically adjust its position along the guide jaw axis. This dynamic adjustment mechanism allows the guide opening width to be varied to match different needle diameters, replacing the need for multiple static guide sleeves with a single dynamically adaptable component.
2Adaptability or versatility
If the target axis is re-adjusted for each needle diameter, then adaptability is improved, but time consumption increases
Solution Approach 1:
The movable portion of the guide jaw is pre-configured with adjustment capabilities along the guide jaw axis. Before needle insertion, the movable portion can be quickly positioned to the appropriate location corresponding to the required needle diameter, so that when needle replacement is needed, only a simple position adjustment is required rather than complete re-adjustment of the target axis.
Solution Approach 2:
The single guide jaw with its movable portion serves multiple functions: it can accommodate different needle diameters, maintain the target axis alignment, and provide stable guidance. This universal design eliminates the need for multiple specialized guide sleeves, allowing rapid switching between different needle sizes while maintaining precise targeting.
3Ease of operation
If ball heads are used for adjusting arms, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The ball head components are removed from the adjusting arm connection points. Instead of using spherical joints that allow multi-directional movement, the adjusting arms are directly connected to the guide jaw at specific predetermined positions. This extraction of the ball head mechanism eliminates the potential for lateral deviation while maintaining the ease of adjustment through direct linear movement.
Solution Approach 2:
The connection between the adjusting arms and the guide jaw is designed with asymmetric, position-specific mounting points rather than symmetric spherical joints. Each adjusting arm connects at a specific location that is optimized for its function, preventing unwanted movements and ensuring that the needle channel center remains precisely aligned even during adjustment operations.
4Adaptability or versatility
If multiple inserts are needed for different needle diameters, then adaptability is improved, but cost increases
Solution Approach 1:
The guide jaw with its movable portion serves as a universal component that can accommodate multiple needle diameters. Instead of requiring separate guide sleeves for each needle size, this single multi-functional guide jaw can be adjusted to work with different needle diameters, significantly reducing the total number of components needed while maintaining full adaptability.
Solution Approach 2:
The functions of multiple separate guide sleeves are merged into a single guide jaw structure with a movable portion. The movable portion integrates the adaptability features that would otherwise require multiple discrete components, combining the functions of several guide sleeves into one unified, adjustable component that reduces both quantity and cost.
Data Source
AI summary
For variable use and simple construction of an instrument guide, particularly for inserting a puncture needle into patients, wherein the instrument guide (1) has a main body (2), which is mounted pivotably in a plurality of axes preferably on two adjusting arms (3, 4), according to the invention the instrument guide (1) has two or more guide cheeks (5), which are centrally adjustable and coupled to one another. This ensures that, when changing between instruments or needles of different thicknesses, the centre of the needle channel remains precisely on the target or central axis (6a).