AMS Spring 2023

DragonFlex — A New 3D Printed Medical Device for Complex Procedures

6K SmarTech

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Biomechanical engineer Filip Jelínek of the Austrian Center for Medical Innovation and Technology has developed prototypes for a medical device which use 3D design and printing which is likely to change how doctors analyze and remove cancerous tissues and perform what are known as “keyhole” operations.

dragonflexThe tool is meant to be minimally invasive, and it’s aimed at improving the durability and manufacturability of medical instrumentation.

Working in collaboration with Paul Breedveld and Rob Pessers of Delft University of Technology, Jelínek built the DragonFlex, a steerable, minimally invasive surgical instrument prototype. It looks a bit like a pair of scissors, but procedures undertaken using the device cut recovery time for patients and leave less post-operative scar tissue behind.

Filip Jelínek

Filip Jelínek

Almost entirely 3D printed, the DragonFlex uses very few components to keep down manufacturing costs and limit assembly time. Jelínek believes the instrument can be marketed as a disposable, single-use product.

At just 5mm wide, the DragonFlex prototype features a rolling joint with a special driving cable guide and a simple bolt-and-wheel mechanism for cable clamping and adjusting tension. The DragonFlex was made via additive manufactured from a ceramic-filled epoxy resin.

According to Jelínek, while the DragonFlex provides nearly equivalent functionality to other steerable laparoscopic instruments, constructing it with 3D printing techniques provides a number of advantages.

“Using 3D printing changes the way TU Delft researchers design,” he says.

Only the cables and turnbuckles are made of metal.

The DragonFlex instrument tip contains just a few parts, and it’s driven and bound by two cables mechanically fixed in the handle. Two ‘orthogonal planar joints’ feature an innovative rolling link mechanism to let the cables to follow circular arc profiles of a diameter which is 1.5 times larger than the width of the instrument shaft.

RTEmagicC_DragonFlex2.jpgAside from maximizing the lifespan of the cable, the rolling link was built to equalize the force requirements on both cables throughout the rotation of the joint. It makes handling fluid and effortless, and it also enables control of seven degrees of freedom.

Two DragonFlex prototypes were developed using additive manufacturing technology, and they both allow grasping and omnidirectional steering over ±90° and feature high bending stiffness and extreme simplicity.

The orange prototype was printed by TNO (Eindhoven, The Netherlands) using a Perfactory® SXGA+ Mini Multi Lens rapid prototype manufacturing system from a ceramic‐filled epoxy resin, EnvisionTEC® NanoCure RCP 30, printed at 30μm resolution and 50μm layer thickness; the clear prototype was printed by PROFORM AG (Marly, Switzerland) using 3D Systems Viper si2™ SLA® System from 3D Systems Accura® 60, printed at 75±15μm resolution and 2.5μm layer thickness.

The DragonFlex is a medical instrument which aims to be an inexpensive replacement for existing tools. Do you know about any medical devices that have been improved with the aid of 3D printing? Let us know in the 3D Printed Medical Device for Complex Procedures forum thread on 3DPB.com.

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[Source: ASME, Informa Healthcare]

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