Multi-Bevel Medical Needle Reducing Penetration Force and Tissue Coring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current injection needles face challenges in reducing penetration force, minimizing tissue stretching, and preventing coring, which contribute to patient discomfort and potential complications during medical procedures.
Innovation Solution
A multi-beveled needle design with specific angles and rotations of bevels on the proximal end, including primary, middle, and tip bevels, is implemented to create a smoother tissue cutting and insertion process, reducing the sharpness of the needle tip and preventing tissue coring by enlarging the opening and widening the sharp edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the needle tip is made sharper to reduce penetration force, then the penetration force is reduced, but the tissue stretching and coring increase causing patient discomfort
Solution Approach 1:
The needle tip is divided into multiple beveled surfaces (first bevel, second bevel, third bevel, fourth bevel) with different angles and orientations. This segmentation allows each surface to perform a specific function: the first bevel initiates penetration, the second bevel reduces stretching, the third and fourth bevels prevent coring by enlarging the opening and widening the sharp edge respectively.
Solution Approach 2:
Different regions of the needle tip are given different geometric properties through the multi-bevel design. Each bevel has specific angle characteristics (e.g., the fourth bevel has a larger angle than the third bevel) tailored to its local function, creating optimal tissue interaction at each stage of penetration.
2Ease of manufacture
If the needle tip geometry is simplified to reduce manufacturing complexity, then the manufacturing is easier, but the ability to reduce penetration force and prevent coring is compromised
Solution Approach 1:
The complex tip geometry is segmented into four distinct beveled surfaces, each with defined angular relationships. This segmentation makes the manufacturing process more controllable and repeatable compared to attempting to create a single complex surface, as each bevel can be formed and measured independently.
Solution Approach 2:
The invention specifies precise angular parameters for each bevel (with the fourth bevel having a larger angle than the third bevel) to achieve the desired performance. These parameter specifications provide clear manufacturing targets that ensure consistent penetration performance and coring prevention across production batches.
3Object-affected harmful factors
If the needle tip is made less sharp to prevent coring, then the coring is reduced, but the penetration force increases
Solution Approach 1:
The penetration process is divided into stages corresponding to different bevels. The initial penetration is handled by the first and second bevels which have geometry optimized for force reduction, while the third and fourth bevels with larger angles take over for coring prevention, ensuring each function is performed by the most suitable geometric feature.
Solution Approach 2:
The third and fourth bevels are designed to enlarge and widen the opening before the needle fully penetrates. This preliminary action of creating a larger aperture prevents coring from occurring during the main penetration event, while the earlier bevels have already reduced the force required to initiate and complete penetration.
Data Source
AI summary
A needle having a needle body defining a first reference plane therethrough and a multi-beveled point including a primary bevel, two first middle bevels, two tip bevels. The primary bevel, the first middle bevels, and the tip bevels are located on a first face and, each of the first middle bevels is located between the primary bevel and one of the tip bevels. The primary bevel is provided on the cannula at a first angle of inclination with respect to the first reference plane and a first angle of rotation with respect to the first reference plane. The two first middle bevels are provided on the cannula at a second angle of inclination with respect to the first reference plane and a second angle of rotation with respect to the first reference plane. The two tip bevels are provided on the cannula at a third angle of inclination with respect to the first reference plane and a third angle of rotation with respect to the first reference plane. The second angle of rotation and the third angle of rotation are greater than the first angle of rotation respect to the first reference plane.