Stereotactic Needle Guide with Falling Arc for Respiratory Motion
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Solution Overview
Problem
Current medical devices for precise needle placement are limited to specific body parts and lack compatibility with advanced imaging techniques like CT and MRI, making it difficult to accurately position needles in various body locations without causing damage to vital organs, especially during respiratory movements.
Innovation Solution
A universal image-guided stereotactic needle placement device compatible with CT and MRI, featuring a base plate, supporting ring, arc for needle guide, screw, pin, and a needle guide that allows for precise positioning and movement with respiratory motion by falling away from the needle once in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed stereotactic device is used for needle placement, then precise positioning can be achieved, but the device cannot adapt to respiratory movements causing potential organ damage
Solution Approach 1:
The arc is designed to be movable rather than fixed, allowing it to fall away from the needle path when the patient breathes. This dynamic structure enables the device to adapt to respiratory movements while maintaining precise needle placement capability when needed.
Solution Approach 2:
The stereotactic device is divided into separable components: a base plate, a supporting ring, and a movable arc. This segmentation allows the arc to move independently from the fixed base plate and supporting ring, enabling adaptation to respiratory motion while maintaining overall structural stability for precise positioning.
2Measurement precision
If multiple needle placement attempts are made to reach the precise target, then the needle can be positioned accurately, but serious complications such as internal bleeding and organ damage may occur
Solution Approach 1:
The device allows pre-planning of the needle path using imaging techniques (CT/MRI) to identify the safest trajectory that avoids vital organs. The arc is positioned and secured before needle insertion, establishing a predetermined safe path that eliminates the need for multiple trial attempts during the procedure.
Solution Approach 2:
The device integrates with imaging guidance systems that provide real-time feedback on needle position relative to the pre-planned path and surrounding organs. This feedback mechanism allows verification of correct positioning before needle insertion, preventing damage to vital structures.
3Adaptability or versatility
If a universal device is designed for whole body use including brain, chest and abdomen, then versatility is improved, but device complexity increases
Solution Approach 1:
The stereotactic device uses a standardized base plate and supporting ring design that can be applied to different body regions (brain, chest, abdomen). The movable arc mechanism provides universal adaptability across body parts, allowing the same device structure to serve multiple functions without requiring region-specific modifications.
Solution Approach 2:
The device allows adjustment of geometric parameters such as arc radius, needle entry angles, and target coordinates to accommodate different body regions and anatomical variations. These parameter changes enable universal application across brain, chest, and abdomen without changing the fundamental device structure.
Data Source
AI summary
The subject invention is an image guided, Computerized Tomography and Magnetic Resonance Imaging compatible device for inserting needle or any such medical device at a desired place in the body.The subject invention comprises a circular base plate, a supporting ring that is placed in a groove in the base plate, an arc, a needle guide that slides on the arc, a screw which fixes the arc with the supporting ring and the circular base plate and a locking pin which fixes the arc with the supporting ring in such a way that the arc becomes perpendicular to the circular base plate. When the locking pin is removed, this allows the arc to fall and thus frees the needle placed to move with breathing without hindrance from the subject invention, enabling placement of needle also in body parts that move with breathing.