Strain gauges have revolutionised the medical device industry by enhancing both precision and reliability. To understand their impact, we spoke with Anjali Mahajan, Engineering Manager – OEM Sensor, about strain gauge technology for medical equipment. She shared insights on how this technology is advancing medical devices, from wearables to implants, and overcoming design challenges in the field.
Strain gauges have made a huge difference by significantly improving the accuracy of force and load measurements in medical devices. For example, in prosthetics and implants, they measure the stress or deformation these devices undergo. This data allows our customers to refine the design, ensuring they can withstand real-world conditions. Additionally, it helps identify weak points early, resulting in more durable and reliable devices over time.
There are several types, each suited for different applications. Metal foil strain gauges are widely used for their excellent sensitivity and temperature stability. Semiconductor strain gauges are great for miniaturised devices because they’re highly sensitive and work well with small, implantable technology. For disposable devices, thick film strain gauges are a more cost-effective option, though they are less sensitive. Then, we have optical fiber strain gauges, which are perfect for situations where we need high accuracy without electrical interference. Finally, piezoelectric strain gauges are ideal for monitoring dynamic strains, such as vibrations, in real time.
Yes, definitely. Wearable devices like fitness trackers and smartwatches already use strain gauges to monitor health metrics. They can track mechanical strain caused by movements, allowing users to monitor physical activity and heart rate. For instance, strain gauges measure the subtle deformations caused by heartbeats or breathing, providing continuous data on cardiovascular and respiratory health. They’re also used for tracking posture or preventing issues like pressure sores by monitoring body pressure in real time.
Strain gauges have transformed medical devices by providing precise, real-time data on forces and pressures, enabling more accurate diagnostics, personalised treatment, and improved patient outcomes
There are quite a few challenges to consider. Achieving the right sensitivity and accuracy is key, especially when working with small devices. This can be addressed by selecting the right strain gauge type, using advanced calibration techniques, and optimising signal conditioning. Size and integration are also major hurdles, particularly for wearable and implantable devices. To overcome these, we use miniaturised gauges and flexible substrates to fit components into compact designs. When it comes to biocompatibility, especially in implants, the materials need to be safe for the body, so we use specialised coatings and encapsulation to prevent adverse reactions. Lastly, durability, power consumption, and regulatory compliance are essential considerations. Devices must withstand harsh environments, operate on minimal power, and meet strict safety standards, which requires careful material selection and thorough testing throughout development.
Strain gauges provide critical data that helps diagnose and treat a variety of conditions. In biomechanics, for example, they measure the forces acting on joints, bones, or implants, giving doctors detailed insights into issues like abnormal gait or joint instability. In rehabilitation, they track strain during physical therapy exercises, helping therapists adjust treatment plans based on a patient’s progress. For cardiovascular health, strain gauges measure the mechanical strain on the heart, helping detect abnormalities or monitor heart function. In respiratory care, they track breathing movements, which can help manage conditions like asthma or sleep apnea. They’re also used in preventing pressure ulcers by monitoring body pressure on certain areas, which is especially useful for bedridden patients. Overall, they provide the detailed, real-time feedback needed for more effective and personalised treatment.
Interviewer: It sounds like strain gauges are revolutionising medical devices.
The technology is definitely evolving. We’re likely to see even greater integration of strain gauges in wearable and implantable devices, enabling more seamless and continuous health monitoring. As these devices become smaller and more sophisticated, the potential for improving patient outcomes is huge. We’ll continue to find new ways to use strain gauges for better diagnostics, treatment, and personalised healthcare.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.