Intro

Introduction to Biomaterials

Overview

  • Host institution: UMass Amherst, The Commonwealth's Flagship Campus
  • Course focus: Introduction to Biomaterials
  • Lecture: Week 1, Lecture 1

Perception of Biomaterials

  • What comes to mind when the term "biomaterial" is mentioned?

Society's Misconceptions

  • Differentiate between what society perceives regarding biomaterials and the actual applications and research in the field.
  • Example mentioned: Synthetic Spider Web Silk

Definition of Biomaterials

  • Biomaterials Science:
    • Definition:
    • Materials made from biological sources.
    • Materials that interface with biological systems.
    • Applications:
    • Therapeutics
    • Diagnostics
    • Disease modeling
    • The field combines elements of:
    • Sciences
    • Engineering
    • Medicine

Clinical Needs for Biomaterials

  • The demand for organ transplants exceeds the supply.
    • Statistics:
    • Organ transplant supply is three times less than demand.
  • Purpose of Biomaterials:
    • Aid in:
    • Tissue revival
    • Reconstruction
    • Replacement

Market Analysis

  • Market share statistics from 2014 to 2025 segmented by various medical fields:
    • Statistics (USD billion):
    • 2014: 5.17
    • 2015: 4.37
    • 2016-2025 projections not specified in detail but imply growth over time.
    • Market categories include:
    • Cardiovascular
    • Ophthalmology
    • Tissue Engineering
    • Dental
    • Plastic Surgery
    • Orthopedic
    • Neurology
    • Wound Healing
    • Other categories
    • Sources for market data: www.grandviewresearch.com

Classes of Biomaterials

  • Three major classes identified:
    1. Metals
    2. Ceramics
    3. Polymers

Distinction Between Materials and Medical Devices

  • Medical devices may include combinations of different biomaterials.
  • Consideration of additional non-material components (e.g., electrical components).
  • Focus:
    • Individual biomaterials and their interactions with biological systems.

Fundamentals of Biomaterials

  • Requirements for implanted materials:
    • Must be compatible with cells.
    • Must not pose risks of injury or toxicity.
    • Should not be rejected by the immune system.
  • Biocompatibility:
    • Defined as the minimum requirement for materials used in biological settings.
  • Question posed: Is biocompatibility always sufficient?
  • Additional considerations:
    • Material function
    • Material properties

Design Considerations in Biomaterials

  • Essential design factors:
    1. Method or site of application
    2. Forces of load/contact
    3. Biocompatibility
    4. Causes or effects of failure

Evolution of Biomaterials

  • Classification of biomaterials evolution:
    1. Bio-inert:
    • Characteristics: Interfaces with biological systems but does not interact further; replaces function without altering the environment.
    1. Bio-active:
    • Characteristics: Releases factors into the surrounding environment; performs a useful function; may be cleared; interacts with and instructs cells.
    1. Regenerative:
    • Characteristics: Restores new biological tissue; potentially replaced by the body over time.

Examples of Biomaterials

  • Specific biomaterial applications:
    • Hip Implants (Manufacturer: Stryker)
    • Artificial Mitral Valve (Manufacturer: Edwards LifeSciences)
    • Gliadel Wafers (Manufacturer: Arbor Pharm)
    • Neuro-Spinal Scaffold (Manufacturer: InVivo Therapeutics)
  • Generational classifications (Gen1, Gen2, Gen3) of implants are noted but specific criteria are not detailed.

Additional Examples of Biomaterials by Category

  • Bio-inert:
    • Silicone implant, false tooth
  • Bio-active:
    • Bioactive glass and ceramics, drug-eluting vascular stents
  • Regenerative:
    • Inductive scaffolds, materials for stem cell delivery

Conceptual Framework

  • Big Picture Overview:
    • Synthesize therapies and tissue microenvironments.
    • Techniques involved:
    • Photolithography
    • Droplet assembly
    • Soft-lithography
    • Microfluidics
    • Micropatterning
    • Microfabricated cultures
    • In vivo monitoring of pathogens and nanoparticles
      • Scale: Nanomaterials down to 10 nm, with self-assembly and bio-responsive technologies discussed.
  • Reference for further exploration: https://lmrt.mit.edu/research

Challenges and New Trends

  • Students will face challenges across varying scales in biomaterials research.
  • Mentions of exciting new trends including applications of 3D printing for biomaterials aimed at enhancing bone integration and healing.
    • Reference for new trends:
    • https://news.feinberg.northwestern.edu/2016/09/promising-biomaterial-to-build-better-bones-with-3-d-printing/

Course Engagement

  • The course will cover multifaceted aspects of biomaterials, encouraging engagement with evolving research and technology trends.