MRI-Compatible Biopsy Device Linear Actuator
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Solution Overview
Problem
Current biopsy devices used in MRI-guided procedures often require the removal of ferrous materials from the procedure room during imaging, increasing procedure time and cost due to the need for additional steps.
Innovation Solution
A biopsy device with a needle and cutter assembly driven by an MRI-compatible linear actuator, reducing the use of ferrous materials and enhancing compatibility with strong magnetic fields by incorporating a non-ferrous linear motor assembly and cutter drive system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ferrous materials are used in biopsy devices, then mechanical strength and structural integrity are improved, but MRI compatibility deteriorates due to interference with magnetic fields
Solution Approach 1:
The patent replaces ferrous mechanical components with non-ferrous alternatives (such as aluminum, titanium, or composite materials) that maintain structural integrity while being compatible with MRI magnetic fields. This substitution eliminates the harmful interaction between ferrous materials and MRI fields while preserving the mechanical strength needed for biopsy operations.
Solution Approach 2:
The patent employs composite materials that combine non-ferrous metals with polymers or other materials to create structures that are both mechanically strong and MRI-compatible. These composite constructions provide the necessary structural integrity for the biopsy device while avoiding interference with the MRI magnetic field.
2Object-affected harmful factors
If ferrous materials are removed from the procedure room during MRI imaging, then MRI compatibility is improved, but procedure time increases due to additional removal and replacement steps
Solution Approach 1:
The patent incorporates non-ferrous materials in the biopsy device from the outset, eliminating the need for subsequent removal or replacement of ferrous components during the MRI procedure. This preliminary selection of MRI-compatible materials streamlines the workflow and prevents time-consuming interruptions.
3Object-affected harmful factors
If non-ferrous materials are used in biopsy devices, then MRI compatibility is improved, but mechanical strength may be compromised
Solution Approach 1:
The patent utilizes composite material constructions that combine non-ferrous metals with reinforcing polymers or structural materials to achieve the necessary mechanical strength while maintaining MRI compatibility. These composites provide both structural integrity and magnetic field compatibility.
Solution Approach 2:
The patent optimizes the physical and chemical parameters of non-ferrous materials (such as alloy composition, density, and structural configuration) to enhance mechanical strength while preserving MRI compatibility. By carefully selecting and tuning material properties, the device achieves both strength and magnetic field compatibility.
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 solution allows for seamless MRI compatibility, reducing the need for material removal during procedures, thereby decreasing costs and procedure time while maintaining accurate tissue sampling capabilities.
Implementation Method 1
A biopsy device with a needle and cutter assembly driven by an MRI-compatible linear actuator
Data Source
AI summary
A cutter actuation assembly for actuating a cutter of a biopsy device includes a cutter sleeve, a receiving member, and a linear actuator. The cutter sleeve is fixedly secured to the cutter of the biopsy device. The receiving member is configured to receive at least a portion of the cutter sleeve. The linear actuator is configured to translate the cutter sleeve. The receiving member is configured to rotate the cutter sleeve as the cutter sleeve is translated relative to the receiving member.