Thermal model to investigate the temperature in bone grinding for skull base neurosurgery

Abstract

This study develops a thermal model utilizing the inverse heat transfer method (IHTM) to investigate the bone grinding temperature created by a spherical diamond tool used for skull base neurosurgery. Bone grinding is a critical procedure in the expanded endonasal approach to remove the cranial bone and access to the skull base tumor via nasal corridor. The heat is generated during grinding and could damage the nerve or coagulate the blood in the carotid artery adjacent to the bone. The finite element analysis is adopted to investigate the grinding-induced bone temperature rise. The heat source distribution is defined by the thermal model, and the temperature distribution is solved using the IHTM with experimental inputs. Grinding experiments were conducted on a bovine cortical bone with embedded thermocouples. Results show significant temperature rise in bone grinding. Using 50°C as the threshold, the thermal injury can propagate about 3 mm in the traverse direction, and 3 mm below the ground surface under the dry grinding condition. The presented methodology demonstrated the capability of being a thermal analysis tool for bone grinding study.

Numerical evaluation of sequential bone drilling strategies based on thermal damage

“…In this study, the heat source was defined by heat flux h s , which was determined by fitting the experimental temperature through the FEA thermal model, known as IHTM [18,19]. This method optimizes h s to minimize the discrepancy between the model and actual temperatures, automatically compensating for errors from unknown heat loss and parameter uncertainty.…”

“…IHTM finds the resultant heat source based on the best-fitted overall temperature field despite small errors existing in measurements, thermal properties, or geometrical settings. We have previously used this method to quantify a complex heat flux profile for deep-hole drilling under minimum quantity lubrication and to study the temperature distribution around diamond burrs used in neurosurgical bone grinding [18,19].…”

Temperature prediction in high speed bone grinding using motor PWM signal

“…An inverse heat transfer method (IHTM) for spherical grinding wheels, developed in our previous studies [13–14], was adopted to determine the heat generation for each test. The inverse method searches for a proper heat source that creates the temperature data in FEA to best fit the experimental measurements.…”

A mechanistic force model for simulating haptics of hand-held bone burring operations

“…The depth of cut is taken as 0.5 mm based on the previous studies [21,22]. The spindle speed used in the experiments is 60,000 rpm, as it is a common speed used in surgery.…”