Rotatable Inner Needle Aspiration Assembly for Bone Marrow Sampling
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Solution Overview
Problem
Current methods for aspirating bone marrow are cumbersome and time-consuming, especially when harvesting large quantities, as they require manual advancement and rotation of the needle, which can lead to marrow dilution with peripheral blood.
Innovation Solution
An aspiration assembly comprising an outer cannulated needle, an inner aspiration needle with a threaded portion, and a threaded collar, allowing for controlled rotation and depth adjustment of the inner needle within the outer needle to aspirate bone marrow from different positions within the bone marrow cavity, preventing dilution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual advancement and rotation of the needle is performed between successive draws, then bone marrow can be aspirated from different areas to prevent dilution, but the procedure becomes cumbersome and time-consuming
Solution Approach 1:
The inner aspiration needle is made rotatable within the outer cannulated needle, allowing dynamic adjustment of the needle's orientation and position. This enables the operator to rotate the inner needle to different angular positions (e.g., 90 degrees) and advance it to different depths without removing or repositioning the entire assembly, thus preventing marrow dilution while reducing procedure time
Solution Approach 2:
The aspiration needle is divided into two separate components: an outer cannulated needle that remains stationary in the bone, and an inner aspiration needle that can be independently rotated and advanced. This segmentation allows the inner needle to be repositioned multiple times within the outer needle to sample different marrow areas without moving the outer needle, improving efficiency while maintaining sample integrity
2Quantity of substance
If large amounts of bone marrow are harvested, then more successive draws are required, but each draw requires manual needle advancement and rotation which increases time consumption
Solution Approach 1:
The rotatable inner aspiration needle allows for rapid repositioning between successive draws. After aspirating a portion of marrow, the inner needle can be quickly rotated to a new angular position and advanced further into the marrow cavity without removing the outer needle, enabling efficient harvesting of large volumes while maintaining productivity
Solution Approach 2:
The outer cannulated needle is预先 inserted into the bone marrow cavity before the inner aspiration needle is used for multiple successive draws. This preliminary positioning eliminates the need to reinsert the needle for each draw, allowing rapid successive aspirations from different positions within the same cavity, thereby increasing harvesting efficiency for large volumes
Data Source
AI summary
Disclosed is an aspiration assembly including an outer cannulated needle having a tip, a threaded collar, and an inner aspiration needle. A material can be aspirated through at least the inner aspiration needle. The distance that the tip of the inner aspiration needle extends from the tip of the outer cannulated needle changes when the inner aspiration needle is rotated relative to the outer cannulated needle.