System designers of portable medical devices are facing many problems, including shrinking size, increasing functionality, and extending the life of batteries used in implantable devices, while ensuring device safety through optimal reliability and efficacy. Hey. In addition, devices used in radiotherapy environments are susceptible to single event inversion (SEU) due to ionizing radiation. Engineers must also incorporate this impact into design considerations, as these challenges may result in dangerous operational conditions for the user. .
This article will introduce the technical challenges and solutions faced by today's miniaturized medical devices, and provide medical device product developers with high-performance FPGA-based solutions to create low-power, high-reliability products.
Highly integrated FPGA powers medical equipment to blow large winds
Miniaturization has become a major growth driver in the medical device market, such as implantable cardiac defibrillator (ICD) and heart rate management (CRM), all of which have entered miniaturization. Not only that, product developers reduce the size of the device, allowing the product to use smaller batteries while improving product power consumption.
Figure 1 shows the Pillcam wireless endoscopic imaging capsule developed by Given Imaging using miniaturization technology. This product reduces the size of the battery by using a custom RF transceiver because it allows the capsule to consume less than 7.5 milliwatts. Watts (mW), which can also transfer up to fourteen images per second during an 8-hour work.
In addition to custom RF transceivers, field-programmable gate array (FPGA) components are also an important factor in miniaturizing medical devices. Traditional design engineers have traditionally developed human-machine interface (HMI) and micro-motor controllers for portable medical devices using microcontrollers (MCUs), application specific standard products (ASSP) chips, and small programmable logic components. Not only is this method difficult to reduce the size of the device, but it is also not suitable for optimizing the number of channels for sensors and actuators that are important. In contrast, FPGA-based solutions are ideal for adding more functionality to smaller package sizes to meet the design requirements of smaller form factors; they also offer the added benefit of allowing users to upgrade their designs. It is therefore able to support new standards or provide more functionality.
FPGA components also help reduce power consumption compared to alternative solutions. For example, liquid crystal display (LCD) panel power consumption in portable medical devices accounts for half of the power consumption budget of the application device. The solution is to design the system and place the LCD and control logic in the power saving mode as much as possible to greatly reduce Battery power consumption. Since ASSP does not take into account the actual needs of the medical market, it is difficult for product developers to develop these designs with ASSP. It is easier to develop low-power designs using FPGAs with programmable features.
In addition, product developers can also use space-efficient semiconductor packaging technology to reduce the size of the device, such as chip on board (COB) assembly, chip on chip (CC) and advanced å ( 3D) package. These packaging technologies reduce the overall circuit space of the heart rate management device by up to 80%; one of the most effective techniques is the chip stacking method, which reduces the length of the interconnect and reduces the resistance while improving yield.
Chip stacking allows design engineers to combine multiple wafer processing technologies in a small footprint while improving test access points. In the next generation of stacked chip solutions, the Thin Interconnected Package Stack (TIPS) project has made significant progress. This project was developed by the nanoelectronics research organization IMEC in cooperation with enterprises and social organizations. The project provides a packaging method that reduces component height, shortens length and width, and also has the advantages of a single module.
Preventing hackers from tampering with data flash FPGAs
Today's next-generation FPGA components also provide important security features to ensure that medical devices can be legally upgraded. Because portable medical devices are often at risk of being stolen, counterfeited, aftermarket tampering and overbuilding, each of these risks can have serious consequences for the medical device market. For example, if the wrong software is downloaded to the insulin pump, or if counterfeit components are used in the design, either situation may cause the insulin pump to give an inaccurate dose, increasing the risk of injury to the patient.
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