Magnetic Torque Transfer Interface for Implantable Assemblies
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Solution Overview
Problem
Existing torque transfer interfaces for implantable medical devices face challenges such as difficulty in assembly, require precise alignment, and do not allow for axial translation or non-concentric shaft arrangements, leading to increased friction and wear.
Innovation Solution
The use of magnetic and toroidal spring interfaces that allow for rotational coupling between a driver and receiver, enabling axial translation and side loading, while reducing friction through complementary geometric fits and magnetic attraction, and incorporating thrust bearings to maintain alignment and reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins and aperture arrangements are used for torque transfer, then torque transfer is achieved, but assembly difficulty increases and precise alignment is required
Solution Approach 1:
The patent replaces traditional mechanical pin and aperture torque transfer mechanisms with a magnetic field-based torque transfer system. The driver assembly includes a magnet that generates a magnetic field to rotate the lead screw, eliminating the need for direct mechanical contact and complex alignment features. This substitution resolves the contradiction by maintaining reliable torque transfer through magnetic coupling while dramatically simplifying assembly procedures and eliminating precise alignment requirements.
2Reliability
If traditional torque transfer interfaces are used, then torque transfer is achieved, but friction and wear increase
Solution Approach 1:
The patent eliminates direct mechanical contact between the driver and lead screw by using magnetic field coupling. The magnet in the driver assembly creates a magnetic field that directly acts on the lead screw, transferring torque without physical contact. This eliminates friction and wear between these components while maintaining effective torque transfer, resolving the contradiction between reliable torque transfer and minimizing harmful frictional effects.
3Reliability
If axial assembly is required, then torque transfer is achieved, but assembly complexity increases
Solution Approach 1:
The patent replaces complex axial assembly requirements with a simplified magnetic coupling system. The driver assembly with its magnet can be positioned and coupled to the lead screw through magnetic attraction without requiring precise axial alignment or complex mechanical interlocking features. This substitution maintains reliable torque transfer while significantly reducing assembly complexity and allowing for more flexible installation procedures.
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 interfaces provide efficient torque transfer with reduced friction and wear, allowing for smooth, gradual motion and improved assembly ease, even with minor imperfections, by using magnetic coupling and toroidal springs to lock and align components.
Implementation Method 1
the first magnetic member is configured to attract the second magnetic member, and the second magnetic member is configured to rotate in response to a rotation of the first magnetic member
Data Source
AI summary
Implantable medical devices are disclosed herein, having a biocompatible housing; a driver of rotational motion; a receiver of rotational motion; and an interface configured to transfer torque from the driver to the receiver. In various embodiments, the interface comprises magnetic, mechanical, or magnetic and mechanical elements for transferring torque.