Drilling in bone: modeling heat generation and temperature distribution.

Area of Science:

• Biomedical Engineering
• Orthopedic Surgery
• Materials Science

Background:

• Drilling bone is a common surgical procedure.
• Elevated temperatures during drilling can cause thermal necrosis and damage to bone tissue.
• Predicting and mitigating heat generation is crucial for patient outcomes.

Purpose of the Study:

• To develop a predictive model for heat generation during bone drilling.
• To investigate the influence of various drilling parameters on temperature rise and thermal injury in bone.
• To identify key factors affecting thermal damage during orthopedic drilling.

Main Methods:

• Developed thermo-mechanical equations based on machining theory to model heat generation.
• Coupled these equations with a finite element method (FEM) heat transfer simulation.
• Performed a parametric analysis varying rotational speed, feed rate, drill geometry, and bone properties.

Main Results:

• Drill rotational speed, feed rate, and drill diameter were identified as the most significant factors influencing temperature rise.
• Changes in drill helix angle, point angle, and bone thermal properties had minimal impact on temperature.
• The model successfully predicted temperature rise and potential thermal injury during bone drilling.

Conclusions:

• Optimizing drill speed, feed rate, and diameter is critical for minimizing thermal damage during bone drilling.
• The developed thermo-mechanical model provides a valuable tool for predicting and managing thermal risks in orthopedic surgery.
• Further research can refine the model by incorporating more complex bone properties and surgical scenarios.