{"id":10120,"date":"2026-03-18T08:50:21","date_gmt":"2026-03-18T00:50:21","guid":{"rendered":"https:\/\/uetpcb.com\/?p=10120"},"modified":"2026-03-18T08:50:21","modified_gmt":"2026-03-18T00:50:21","slug":"applications-of-flexible-and-rigid-flex-pcbs-in-wearables-and-medical-devices","status":"publish","type":"post","link":"https:\/\/uetpcb.com\/ru\/applications-of-flexible-and-rigid-flex-pcbs-in-wearables-and-medical-devices\/","title":{"rendered":"Applications of Flexible and Rigid-Flex PCBs in Wearables and Medical Devices"},"content":{"rendered":"<div>When to Use Flexible and Rigid-Flex PCBs: Real Applications in Wearables and Medical Devices<\/div>\n<div>Are you planning to use flex PCBs on your projects? Can\u2019t decide whether to use flexible or rigid-flex on them. This article should help you with your decision.<\/div>\n<div><\/div>\n<h2><span style=\"color: #008000;\">\u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435<\/span><\/h2>\n<div>Modern flex PCBs emerged when polyimide films were developed in the 1960\u2019s. With this, fabricating multiplayer flex circuits became a reality. The board utilizes the copper, adhesive, and polyamide stackup that still exists today.<\/div>\n<div><\/div>\n<div>However, during the 80&#8217;s, the SMT process was developed. During the same period, both multilayer flex and rigid-flex circuits came about. This method allowed flex circuits to be installed on devices with tight space constraints, such as mobile phones, laptops, and medical devices.<\/div>\n<div><\/div>\n<div>Here, you\u2019ll learn more about when to use flexible and rigid-flex PCBs and their real-world application in wearables and medical devices. If you have queries regarding flex and rigid-flex PCBs, UET PCB (<a href=\"https:\/\/uetpcb.com\/ru\/flexible-pcbs\/\">https:\/\/uetpcb.com\/flexible-pcbs\/<\/a>) is always here to help. UET is an expert in manufacturing flex and rigid-flex PCBs and has been in this industry for over 20 years.<\/div>\n<div><\/div>\n<h1><span style=\"color: #008000;\">Flexible vs. Rigid-Flex PCBs<\/span><\/h1>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-9228\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/07\/Custom_Flexible_PCB_Service-300x225.webp\" alt=\"Custom_Flexible_PCB_Service\" width=\"300\" height=\"225\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/07\/Custom_Flexible_PCB_Service-300x225.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/07\/Custom_Flexible_PCB_Service-768x576.webp 768w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/07\/Custom_Flexible_PCB_Service-16x12.webp 16w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/07\/Custom_Flexible_PCB_Service.webp 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><img decoding=\"async\" class=\"alignnone size-medium wp-image-8039\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2023\/10\/home_flex_rigid_pcb-300x217.webp\" alt=\"flex_rigid_pcb\" width=\"300\" height=\"217\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2023\/10\/home_flex_rigid_pcb-300x217.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2023\/10\/home_flex_rigid_pcb.webp 319w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<div>Flex PCBs (often abbreviated as FPCs, or also called flex circuits) are circuit boards that can be bent because they are constructed with polymer films instead of the usual rigid parts. They have a flexible substrate usually made of polyimide, polyester, or even PEEK (Polyether\u2011Ether\u2011Ketone). You\u2019ll usually find in their stack-up coverlay (protective film) the polyamide dielectric, adhesive sections, annealed copper conductive layers, and optional stiffeners.<\/div>\n<div><\/div>\n<div>Rigid-flex PCBs combine rigid (e.g., FR4-based) and flexible PCBs. Both the rigid and flex sections are laminated together into a single piece; hence, no connectors are needed. The flex part is the usual one, made of a polyamide substrate. The rigid part sandwiches the flex part through the inner layers, serving as a conductive inner layer. Rigid-flex PCBs eliminate costly FPC connectors in production lines.<\/div>\n<div><\/div>\n<h2><span style=\"color: #008000;\">The Advantages of Using Either Flex or Rigid-Flex PCBs on Your Wearables and Medical Devices<\/span><\/h2>\n<div>Both flex and rigid-flex PCBs have their own advantages and disadvantages when used in a product. It all boils down to form, function, signal integrity, manufacturing costs, serviceability, and the assembly process.<\/div>\n<div><\/div>\n<h3>When to use Flex PCBs in wearables?<\/h3>\n<div>Flex PCBs will make your circuit modular and flexible. If you work in a tight space inside your casing and need a small room for bends, then using flexible PCBs is the way to go. Additionally, the human body is contoured and can move significantly, making it ideal for flex PCBs. You\u2019ll find many flexible circuits used in conjunction with bending scenarios in wearables, and other areas, such as:<\/div>\n<div><\/div>\n<div>\u25cf Heart Rate Sensors<\/div>\n<div>\u25cf ECG Electrodes<\/div>\n<div>\u25cf Wearable straps<\/div>\n<div>\u25cf Smart Clothing<\/div>\n<div>\u25cf Display flex cables<\/div>\n<div>\u25cf Vibration motor flex cables<\/div>\n<div><\/div>\n<h3>When should you use rigid-flex PCBs instead?<\/h3>\n<div>Since rigid-flex PCBs have flex PCBs built into them, rigid-flex can usually handle most applications where flex PCBs can. However, it\u2019s not a simple scenario; there\u2019s more to using rigid-flex over flex circuits (or vice-versa). It essentially boils down to:<\/div>\n<div><\/div>\n<div>1. Overall cost of making the circuit<\/div>\n<div>2. Assembly or build cost<\/div>\n<div>3. Sub-assembly suppliers<\/div>\n<div>4. Signal integrity<\/div>\n<div>5. Repairability and service<\/div>\n<div>6. Product reliability and compliance<\/div>\n<div>7. Parts replacement<\/div>\n<div><\/div>\n<div>Note that the cost of a rigid-flex PCB is higher than that of a rigid + flex PCB (with connectors). This scenario is due to the cost of fabricating a flexible material with a rigid material in a single lamination sequence. However, do note that sometimes, you have to look at the bigger picture. PCBs with cheap FPC connectors may need to be assembled by hand in an assembly line. Eventually, you may see that the fabrication cost of rigid-flex PCBs catches up as you scale your products into the thousands.<\/div>\n<div><\/div>\n<div>Another thing to consider is that eliminating connectors can improve the reliability of high-speed signals. Additionally, in your DVT compliance, you may have a more robust end product that can withstand vibration tests.<\/div>\n<div><\/div>\n<div><\/div>\n<h3>Serviceability in the Field<\/h3>\n<div>A good product can fail during its lifetime. With this, you should be able to service it. It\u2019s easier to service and replace parts if you have a flex PCB coupled with a connector for that part. Such parts as motors, cameras, CD\/Blu-ray lenses, and other PCBs, etc. It can be cumbersome and time-consuming if the manufacturer omits the connector along with the flex part.<\/div>\n<div><\/div>\n<div>In contrast, rigid-flex PCBs are more commonly used in non-serviceable products. This situation indicates the product is expected to have a low failure rate and high reliability throughout its lifetime. These products are usually sealed, waterproof, dustproof, and even mechanically stable. Though these products may be more expensive to manufacture, they are expected to last for a lifetime.<\/div>\n<div><\/div>\n<h2><span style=\"color: #008000;\">Example of Flex PCB Designs<\/span><\/h2>\n<h3>Smart Watch<\/h3>\n<div>Use Rigid-Flex PCB<\/div>\n<div>The circuit board of a smartwatch almost always requires a rigid-flex PCB. The reason is that rigid-flex gets rid of connectors. Connectors are one of the biggest failure points in smartwatch applications and even on some wearables.<\/div>\n<div><\/div>\n<div>Smart watches are prone to sweat, cold, heat, vibration, repetitive motion, shock, and oxidation, which can cause significant wear and tear. This situation is a perfect application for rigid-flex PCBs because it is sealed, mechanically stable, waterproof, and dustproof. In line with this, smart watches are expected to have a low failure rate and to last long.<\/div>\n<div><\/div>\n<div>Here are some design considerations for smart watches:<\/div>\n<div><\/div>\n<div>\u25cf The SoC and Power Management sections are put in the rigid PCB part.<\/div>\n<div>\u25cf Flex PCBs are used for connecting to the battery, display, sensors, etc.<\/div>\n<div>\u25cf RF sections are on a rigid PCB with controlled impedance.<\/div>\n<div>\u25cf No FPC connectors are used to improve reliability.<\/div>\n<div><\/div>\n<h3>Electronic Medical Grade ECG Patch<\/h3>\n<div>Use Flex PCB<\/div>\n<div>An Electronic ECG patch can benefit from a Flex PCB because it will be worn on a patient\u2019s chest. The ECG sensor can connect to a flexible, bendable PCB that adapts to the contours of the human body. Additionally, the flex part should be non-toxic, and use low-cytotoxicity polyimide material. This ECG patch is meant to be disposable.<\/div>\n<div><\/div>\n<div>Design considerations:<\/div>\n<div><\/div>\n<div>\u25cf Must pass ISO10993 cytotoxicity test.<\/div>\n<div>\u25cf Use nickel-free material on surfaces that touch the human body.<\/div>\n<div>\u25cf Lightweight and bendable.<\/div>\n<div>\u25cf Use low-cost materials since they are disposable.<\/div>\n<div><\/div>\n<div>Additionally, other medical devices can use disposable flex PCBs, such as blood glucose sensors, pregnancy test strips, and single-use medical sensors.<\/div>\n<div><\/div>\n<div><\/div>\n<h2><span style=\"color: #008000;\">\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/span><\/h2>\n<div>There are several real-world applications for flex and rigid-flex PCBs in wearables and medical devices. This article presents some of them, highlighting both the advantages and disadvantages of using either a flex or a rigid flex structure. Finally, UET PCB is an experienced PCB\/PCBA manufacturer that can help fabricate your medical\/wearable devices using these flex circuits.<\/div>\n<div><\/div>\n<div><\/div>","protected":false},"excerpt":{"rendered":"<p>When to Use Flexible and Rigid-Flex PCBs: Real Applications in Wearables and Medical Devices Are you planning to use flex PCBs on your projects? Can\u2019t decide whether to use flexible or rigid-flex on them. This article should help you with your decision. Introduction Modern flex PCBs emerged when polyimide films were developed in the 1960\u2019s&#8230;.<\/p>","protected":false},"author":6,"featured_media":7793,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-10120","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Applications of Flexible and Rigid-Flex PCBs in Wearables and Medical Devices - UETPCB<\/title>\n<meta name=\"description\" content=\"Are you planning to use flex PCBs on your projects? Can\u2019t decide whether to use flexible or rigid-flex on them. 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