Applying Tech: Implantable Devices
How are you influencing implantable devices?
Gabriel O. Adusei, MSc, PhD
Independent MedTech Consultant, Founder, International Association of MedTech Consultants
Medical Device Leak Testing Technical Support Manager, Uson
Uson’s message to any developer of an implantable device is short and to the point. It is never too early to get your supplier of test equipment involved in helping to design your process and the device itself. If you are dealing with a test equipment supplier that gives you such “advice” at premium cost—sometimes to the tune of six figures—that is money down the drain. Any reputable supplier of test equipment builds up-front consultation on application details into their pricing system.
Member of Technical Staff, Cactus Semiconductor Inc.
Recent advances in battery technology have led to the availability of chip-scale batteries, which can drastically reduce the volume of IMDs. Cactus develops circuits to optimize the charging and monitoring of these unique batteries. In addition, Cactus designs ultra-low power circuits that minimize power consumption to enable use of these lower capacity batteries. One example is our fully-integrated timekeeping solution that consumes less than 200 nW.
MEMs devices are rapidly replacing traditional sensors and actuators in IMDs to enable miniaturization. These MEMs devices are often customized to specific applications so they require customized electronics to optimize power and performance.
Cactus also has wireless solutions that support simultaneous wireless communication and battery charging with a single coil. Our communication solutions employ passive back-telemetry, to minimize battery power, thus enabling the use of smaller batteries.
Finally, Cactus designs custom ICs for multi-chip die-stacks that integrate ASICs with microcontrollers and EEPROMs in a single package. The size of the entire IMD is thus optimized in ways only achievable by customization.
Tanner Hargens, MS
Senior Biomedical Engineer, Medical Murray Inc.
Bioabsorbable innovation at Medical Murray has been driven largely by vascular, orthopedic, and surgical applications. The absorbable polymers are initially designed by polymer scientists and engineers to meet the specific mechanical properties and degradation kinetics for each application. Each material will then have its own restrictions when processing to the desired shape. When injection molding absorbables, each material will have limits on the cavity size it is capable of properly filling and must often be processed at the lowest temperatures possible to prevent alteration of the degradation kinetics.
The Sesame nano-molder, invented by Medical Murray, is capable of producing the smallest and most detailed bioabsorbable polymer components by allowing the material to melt to sufficient flow at a lower processing temperature so the material can normalize quicker with a shorter cooling time than is otherwise available. This has also allowed minimal loss of very expensive materials through use of smaller sprues, runners, and reduced melted material in the injection unit. As an example to the understanding the materials and processing, Medical Murray has been able to design and mold the first absorbable living hinges, which allow expansion of a device into the tissue from a small delivery catheter.