MRI Biopsy Depth Stop and Localization Fixture
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Solution Overview
Problem
Current biopsy systems for MRI-guided procedures lack an efficient mechanism for precise and controlled insertion of biopsy devices, particularly in preventing over-insertion and ensuring accurate targeting of lesions within the breast tissue.
Innovation Solution
The proposed system incorporates a localization fixture with a lateral grid plate and a rotatable guide cube, along with a depth stop mechanism, to precisely position and guide the biopsy device, ensuring accurate insertion and preventing over-insertion by using a Z-stop and depth stop device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a biopsy device is inserted into breast tissue during MRI-guided procedures, then tissue sampling can be obtained, but over-insertion may occur leading to inaccurate targeting and potential complications
Solution Approach 1:
The patent applies preliminary action by pre-setting depth stops on the biopsy device before insertion. These depth stops are predetermined mechanical limits that prevent the device from being inserted beyond a safe depth, thereby preventing over-insertion before it can occur and ensuring both accuracy and safety.
Solution Approach 2:
The patent uses an intermediary mechanism in the form of a depth stop device that acts as a mediator between the operator and the biopsy needle. This intermediary component provides tactile and visual feedback about insertion depth, allowing the operator to control the procedure safely without directly feeling or seeing the needle's position in real-time.
2Measurement precision
If a localization fixture with guide structures is used, then insertion accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the localization fixture into separate, modular components: a grid plate with marked positions, a rotatable guide cube with multiple guide holes, and a biopsy device holder. Each component performs a specific function and can be independently adjusted or replaced, reducing overall system complexity while maintaining high positioning accuracy.
Solution Approach 2:
The patent implements dynamics through the rotatable guide cube, which can be rotated to different orientations to access lesions at various angles and depths. This dynamic component allows the same fixture to adapt to different biopsy requirements without requiring multiple fixed guide structures, thereby simplifying the overall device design.
Data Source
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AI summary
A biopsy system, including a biopsy device, a localization assembly, and a control module. The localization assembly is configured to orient the biopsy device relative to a patient. The control module is communication with the biopsy device. The control module is configured to operate a plurality of functional features of the biopsy device. The control module includes a cable and a cable management assembly. The cable management assembly includes a pair of cable management plates, and a weight. Each of the pair cable management plates are disposed substantially parallel to each other and define a space therebetween. The weight is configured to move within the space defined by the pair of cable management plates. The weight is attachable to the cable of the control module and is further configured to slide axially along the cable.