Guide Hole Contact Area Reduction for Biopsy Needle Speed
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Solution Overview
Problem
Existing guide hole structures for shaft insertion, such as biopsy needles, face challenges in maintaining high insertion speed while ensuring accurate alignment, as they often compromise between clearance for speed and fit for precision, leading to reduced needle speed and potential misalignment.
Innovation Solution
A guide hole structure with contact area reducing features, including longitudinal ribs, lateral ribs, and spherical embossing, is designed to minimize the contact area between the shaft and the guide hole, allowing for high-speed insertion with reduced friction and maintaining precise targeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional guide hole structures with clearance are used, then shaft insertion speed is maintained, but alignment precision deteriorates
Solution Approach 1:
The guide hole structure applies local quality by creating specific regions with different contact characteristics. Contact area reducing features are strategically positioned within the guide hole to provide localized guidance only where needed, while other regions maintain minimal contact to reduce friction. This allows the shaft to achieve high-speed insertion while still receiving alignment guidance in critical zones.
2Measurement precision
If tight fit guide holes are used, then alignment precision is improved, but shaft insertion speed deteriorates
Solution Approach 1:
The guide hole is segmented into multiple functional zones using contact area reducing features such as ribs, protrusions, or patterned surfaces. These features divide the continuous contact surface into discrete contact points or reduced contact areas, providing alignment guidance in specific segments while leaving other segments with minimal contact to reduce overall friction and enable high-speed insertion.
3Speed
If increased clearance is provided in guide holes, then shaft insertion speed is maintained, but alignment precision deteriorates
Solution Approach 1:
Contact area reducing features act as intermediary elements between the guide hole and the shaft. These features provide the necessary guidance and alignment function without requiring full circumferential contact, effectively mediating between the need for precision targeting and the need for high-speed insertion with minimal friction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The guide hole structure enables accurate and precise needle targeting at designed speeds, reducing resistance and maintaining high-speed motion, thereby improving the quality of tissue biopsy samples and therapy needle delivery.
Implementation Method 1
The one or more contact area reducing features can be configured to reduce a contact area of a shaft inserted into and/or through the one or more guide holes
Data Source
AI summary
A guide hole structure can include a body defining one or more guide holes through the body between a first surface and a second surface. The guide hole structure can include one or more contact area reducing features forming and/or extending from an inner surface of the body to form the one or more guide holes. The one or more contact area reducing features can be configured to reduce a contact area of a shaft inserted into and/or through the one or more guide holes.