Biomedical Engineering

Biomedical engineering applies engineering principles to medicine and biology — designing devices, instrumentation, imaging systems, prosthetics, biomaterials, and software that diagnose, treat, or monitor patients.

Overview

BME work is dominated by regulatory rigor. A medical device is not finished when it works in the lab — it is finished when it survives a 510(k) clearance or PMA approval and proves safe and effective in clinical use.

Sub-Fields

• Biomechanics — orthopedics, prosthetics, gait, cardiovascular flow.
• Biomaterials — implants, scaffolds, drug-delivery polymers.
• Medical imaging — CT, MRI, ultrasound, PET, X-ray.
• Biosignal processing — ECG, EEG, EMG.
• Tissue engineering & cell culture.
• Clinical engineering — hospital equipment management.
• Health informatics & software (SaMD).

FDA Device Classes

• Class I — low risk (tongue depressors, bandages). General controls.
• Class II — moderate risk (infusion pumps, X-ray). 510(k) clearance.
• Class III — high risk / life-sustaining (pacemakers, heart valves). PMA.

Design Controls (21 CFR 820.30)

1. Design & development planning.
2. Design inputs (requirements).
3. Design outputs (specs, drawings, code).
4. Design review.
5. Design verification (output meets input).
6. Design validation (meets user needs in clinical use).
7. Design transfer to manufacturing.
8. Design changes & Design History File (DHF).

Standards

• ISO 13485 — QMS for medical devices.
• ISO 14971 — risk management.
• IEC 60601-1 — electrical medical equipment safety.
• IEC 62304 — medical device software lifecycle.
• ISO 10993 — biocompatibility.
• 21 CFR Part 11 — electronic records & signatures.
• EU MDR 2017/745.

Tools

• FEA: ANSYS, Abaqus (biomechanics).
• CFD: ANSYS Fluent (cardiovascular flow).
• Signal processing: MATLAB, Python (scipy, BioSPPy).
• Imaging: 3D Slicer, OsiriX, ITK/VTK.
• QMS: Greenlight Guru, MasterControl.