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Related Concept Videos

Impact Loading01:19

Impact Loading

Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
11:51

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Published on: February 10, 2014

Mechanical loading of rigid intramuscular implants.

Gerald E Loeb1, Raymond A Peck, Jasspreet Singh

  • 1Alfred Mann Institute for Biomedical Engineering, University of Southern California, Los Angeles, CA, USA. gloeb@usc.edu

Biomedical Microdevices
|December 21, 2006
PubMed
Summary

New implantable electronic devices called BIONs face stress from muscle contractions. This study analyzes these stresses, offers testing methods, and details a failure analysis for improved in vivo device reliability.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Implantable Electronic Devices

Background:

  • Leadless, permanently implanted electronic devices (BIONs) are being developed for muscle injection.
  • Current BION designs use rigid, brittle materials (glass/ceramic) for hermetic encapsulation, posing risks under mechanical stress.
  • These devices experience repetitive stresses from muscle contractions they stimulate.

Purpose of the Study:

  • To perform a worst-case stress analysis on BIONs during muscle contractions.
  • To propose testing and validation methods for BIONs intended for in vivo use.
  • To present a failure analysis and remediation strategy for BIONs experiencing in vivo failures.

Main Methods:

  • Worst-case stress analysis of BIONs within muscle tissue.
  • Development of testing and validation protocols for implanted electronic devices.
  • Failure analysis of a specific BION design that showed in vivo failures.

Main Results:

  • Identified critical stress points and failure modes in BION encapsulation.
  • Established a framework for rigorous testing and validation of BIONs.
  • Provided a remediation strategy addressing identified failure mechanisms.

Conclusions:

  • Rigorous stress analysis and validation are crucial for the reliability of injectable electronic devices like BIONs.
  • Understanding failure modes is essential for improving the longevity and efficacy of BIONs.
  • The proposed methods and strategies can enhance the success of future BION development and implantation.