Role of Human Factors Engineering in Design of Portable Medical Devices

Portable medical devices leverage technological advancements and portable devices to enhance health and improve healthcare delivery. These devices are increasingly significant in the healthcare sector, enabling remote patient monitoring, broadening access to medical services, and reducing overall healthcare costs. These devices also enable better patient outcomes by facilitating early detection and timely intervention in various medical conditions. 

While these devices offer significant benefits, they also present various challenges: 

• Regulatory Oversight: It is essential to ensure that these devices comply with safety and efficacy standards through proper regulation. 
• Privacy Issues: Protecting patient data is vital, as these devices often handle sensitive health information. 
• Cybersecurity Threats: Safeguarding against cyber-attacks is crucial to maintain the security and integrity of health data. 

Addressing these challenges is crucial for effectively integrating portable medical devices into healthcare systems, enhancing patient care and improving health outcomes. 

Digital health which includes telemedicine, wearable medical devices, portable health applications and various digital health solutions. It offers unparalleled opportunities for innovation and enhancement in healthcare delivery. By utilizing digital technology to collect, analyze, store, and share health data, digital health aims to improve efficiency, accessibility, and overall healthcare outcomes. 

Role of HFE in design of portable medical devices 

Human factors engineering plays a pivotal role in designing design of portable medical devices, by enhancing user interaction and ensuring optimal usability.  

Key aspects include:

• User-Centred Design: Human factors engineering prioritizes designing devices that cater to the needs, abilities, and limitations of users, including healthcare professionals and patients. 
• Usability Testing: It involves conducting usability assessments to identify potential challenges that users may encounter, allowing designers to implement meaningful improvements. 
• Ergonomics: This discipline emphasizes the physical interaction between users and devices, ensuring that controls, displays, and overall design support comfortable and effective use. 
• Cognitive Load: Human factors engineering aims to minimize cognitive load by creating simple, intuitive interfaces, which can help reduce errors during critical tasks. 
• Accessibility: It considers a diverse range of users, ensuring that devices are accessible to individuals with various levels of experience and physical capabilities. 
• Safety and Error Prevention: By analysing potential failure points and use errors, human factors engineering helps design features that enhance safety and reduce the risk of mistakes in high-pressure situations. 
• Training and Support: The field contributes to developing effective training programs and support materials that align with user needs, facilitating smoother adoption and use of the devices. 

Overall, human factors engineering ensures that portable medical devices are not only functional but also user-friendly, enhancing patient care and improving healthcare efficiency. 

Elements of portable medical devices 

Portable devices have distinct requirements compared to stationary devices. Designing their interfaces involves accommodating varied environments and diverse user needs. 

Portable medical devices are intended to serve wide range of purpose, more so than devices at fixed locations. For example, a patient monitoring device can be used at an outpatient clinic or in an ICU/ward environment or in an ambulatory condition. Accommodating various environments and satisfying individual user needs effectively are unique challenges in designing a portable medical device user interface. 

Multiple Users: 

Medical Device applications involve user groups like nurses, doctors, paramedics, etc. A patient monitoring system can be used by nurse, clinician, paramedic, surgeons, and many more who are knowledgeable or trained to handle it. . Each user has unique skills and preferences, making careful design considerations vital to address this diversity. 

Multiple Use Environments: 

Since medical devices are to be used in various use environments, design considerations must ensure adaptability to different environments, such as readability, temperature variation, and rugged usage scenarios. 

Design principles 

Human factors engineer need to consider various attributes when involved in designing a portable medical device. 

1. Weight: The weight of a portable medical device can significantly impact its mobility. It can determine whether the device can be carried by hand or would require a cart to move, or a transport would be required. Designing a lighter weight device is advantageous if the intended purpose, stability, and functionality of the device is attained. 

2. Moving Parts: Many portable devices involve presence of moving parts that are vital for their functionality but might also be source for damage. Considering these factors, design of such movable components with safety is inherently important, ensuring that they do not pose hazards and operate effectively with various user groups. Prioritizing the durability and safety of these moving parts is important for reliable performance. 

3. Size and Shape: The size and shape of a medical device are often determined by its various components. However, creating a portable diagnostic machine that is too large to fit through a hospital hallway would be counterproductive. Therefore, ensuring mobility should be a primary factor in selecting and arranging these components, as the dimensions and form of the device can influence ease of handling and manoeuvrability. 

4. Controls: There are many types of controls available, and their suitability can vary significantly depending on the environment. Some controls are specifically designed to withstand extreme climatic conditions, darkness, continuous vibration, and frequent impacts, making them well-suited for portable medical devices used by first responders. Designers should carefully assess the potential applications of the device to determine which control types will be the most practical and effective for users. 

5. Displays: There is a wide range of display options available, from LED readouts and index card-sized LCD screens to large CRTs. Like controls, certain displays are better suited for specific use cases. Designers should thoughtfully evaluate a device’s intended applications to identify the most practical and user-friendly display types. While larger displays can enhance usability, they may also make the device more challenging to handle. 

6. Audible Signals: Audible signals are an effective way to communicate in environments where visual information may be overwhelming. When used appropriately, a well-coded audio signal can attract immediate attention and convey essential information. However, excessive, or poorly designed audio signals can create confusion and annoyance for users. For portable medical devices, it is important that these audio signals are tailored to the intended environments and effectively communicate with a diverse user base. 

7. Power Supply: Portable medical devices require electrical power, primarily sourced from AC mains (wall outlets) and batteries, though some may also use alternative sources like solar power or air pressure. Ensuring that these devices have sufficient power reserves is crucial for patient care. For example, a portable patient monitor must be able to maintain battery life throughout a patient's transport from a critical care unit to radiology and back, with ample time to spare. 
   To enhance user experience, portable medical devices should limit the need for users to manage power levels and prevent situations where they run out of power unexpectedly. However, balancing power needs with size and weight constraints presents challenges. High-capacity batteries, for instance, might not always be the best option due to their increased size and weight. 

8. Surfaces: Due to the considerable paperwork involved in medical procedures, having a designated workspace is often necessary. Even with the adoption of electronic medical records and forms, work surfaces are still important for supporting various tasks. For example, during a diagnostic procedure, it is essential to have easy access to biopsy tissue containers, syringes, bandages, and other disposables. 
   Careful sizing and positioning of work surfaces can enhance the usability of a portable medical device, particularly when alternative surfaces are not readily available in common use environments. This design consideration can help streamline workflows and improve efficiency during medical procedures. 

9. Instructions for Use: Instructions for use are often stacked in bookshelves and cabinets, which can be far from the place of need. Consequently, users may find it difficult to locate these instructions at crucial moments. For portable devices, especially those that travel significant distances, it is essential for users to have access to the instructions wherever they go. Incorporating device-embedded, computer-based instructions or online resources can help meet this requirement. However, not all environments guarantee immediate Internet access. Therefore, in addition to online options, devices should provide space for an owner’s manual or job aids, such as quick reference guides or troubleshooting checklists, to ensure users have the information they need at hand. 

10. Material: Portable medical devices typically need to be more robust than fixed devices because they encounter various environmental conditions that can weaken certain materials. As a result, selecting the right materials is vital for achieving long-lasting performance. Furthermore, since these devices often experience rough handling, it is important to choose materials that offer a secure grip. Additionally, the materials should resist contamination and be easy to clean to maintain safety and hygiene across different settings. 

11. Cleaning: Portable medical devices, particularly those used in messy procedures or outdoor settings (like accident sites), frequently get dirty. To ensure health and safety, these devices must be designed for easy cleaning, which also helps reduce the workload for healthcare providers. By facilitating a straightforward cleaning process, the likelihood of thorough sanitation is significantly increased, ensuring that devices are properly prepared for use when required. 

Conclusion 

Portable medical devices seek to advance and elevate healthcare on a global scale. Portable medical devices have the potential to revolutionize healthcare by enabling accurate diagnoses, effective treatments, and improved patient engagement. Portable medical devices, whether comprised of hardware, software, or both, carry inherent benefits and risks if they do not operate as intended. Moreover, software developed for specific platforms can have unique characteristics that may introduce additional risks. To ensure device safety, it is vital to implement voluntary measures such as regular inspections, maintenance, repairs, and upgrades to address identified bugs. Manufacturers must also take proactive steps to respond to any identified risks, thereby enhancing the overall reliability and safety of their devices. With the potential to transform healthcare, innovation and growth in portable medical device are enormous paving way for a more integrated and efficient healthcare. 

How Decos can help clients ?

At Decos, we specialize in integrating human factors engineering into the design and development of systems and processes. Our focus is on understanding human capabilities and needs to create solutions that enhance usability and effectiveness. We ensure that medical devices meet rigorous standards and comply with global regulatory requirements in usability engineering. Partnering with us means your products will not only adhere to international compliance but also prioritize patient safety and user experience.