Biopsy Latching Assembly Compact Design
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Solution Overview
Problem
Current motor-driven biopsy devices are larger than ideal, which can interfere with stereotactic localization during procedures, particularly when dealing with lesions better seen on mammography images, and there is a need for a more compact design that does not compromise the functionality of tissue sampling.
Innovation Solution
A biopsy instrument driver with a laterally extending catch arm, a motor, a drive shaft, a translating member, a latch base, and a latch arm, which allows for precise movement and retention of the drive member, enabling a compact design while maintaining the ability to perform tissue sampling efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor-driven biopsy device components are made larger to ensure sufficient driving force and reliability, then the device can perform tissue sampling effectively, but the device size increases and interferes with stereotactic localization during mammography-guided procedures
Solution Approach 1:
The inner cannula is slidably disposed within the outer cannula, allowing one component to be nested inside another. This nested configuration reduces the overall device volume while maintaining the functionality of both cannulas for effective tissue sampling during stereotactic procedures
Solution Approach 2:
The biopsy device is divided into distinct functional segments including the outer cannula, inner cannula, hub, and motor components. This segmentation allows each component to be optimized independently for its specific function while contributing to an overall compact design that does not interfere with stereotactic localization
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 compact design allows for precise tissue sampling without interfering with stereotactic localization, enhancing the biopsy procedure's effectiveness and accuracy.
Implementation Method 1
a translating member threadably coupled to the drive shaft... Rotation of the drive shaft causes axial translation of the translating member along the drive shaft
Implementation Method 2
The latch arm is coupled to the latch base by a pin, such that the latch arm may pivot about the pin relative to the latch base
Implementation Method 3
a motor coupled to the support structure and having a rotatable output
Data Source
AI summary
A biopsy instrument driver includes a drive member having a laterally extending catch arm and movable between a distal, fired position and a proximal, armed position. A reversible motor has a rotatable output comprising or otherwise being operatively connected to a drive shaft, such that activation of the motor rotates the drive shaft. A translating member is threadably coupled to the drive shaft, wherein rotation of the drive shaft causes axial translation of the translating member along the drive shaft. A latch base is operatively associated with the translating member. A latch arm is pivotally coupled to the latch base, and has a distal portion configured to selectively engage and retain the drive member catch arm, and a proximal portion operatively coupled to the translating member, such that movement of the translating member relative to the latch base pivots latch arm distal portion.