You are here

Design of a Three-Axis Accelerometer for Measurement of Heart Wall Motion

Craig Lowrie, Marc Desmulliez
This project comes under the title of the “MicroHeart Project” and its collaborators are Heriot-Watt University, Vestfold University College (Norway) and the Interventional Centre at Rikshospitalet University Hospital (Norway) ... [read more]

This project comes under the title of the “MicroHeart Project” and its collaborators are Heriot-Watt University, Vestfold University College (Norway) and the Interventional Centre at Rikshospitalet University Hospital (Norway). Heriot-Watt’s involvement in this project focuses on the design and fabrication of a miniaturized three-axis accelerometer that will be stitched to the surface of a patient’s heart who is undergoing coronary artery bypass surgery. The sensor will be put in place during the open thorax procedure below where a bypass has been made and will measure heart wall motion to give an early warning of any possible post-operative problems before the patient leaves the hospital. The final design that the student has had fabricated consists of four cantilever beam structures. Sensing is achieved using piezoresistors that are implanted into the beams. The masses are defined using an inductively coupled plasma (ICP) etch. The chips measure approximately 2.5 mm in width and 4 mm in length.