SYM-04: Surgical Robotics and Navigation


Hongliang Ren

National University of Singapore, Singapore

The feasibility of a needleless magnetic-actuated device for the purpose of intravitreal injections is investigated using two different design prototypes, the first of which is a solenoid and the other is actuated by 2 pairs of E-shaped cores where the working principle is slightly similar to the concept of axial resilience in hybrid magnetic bearings
A needleless device could potentially significantly reduce patient anxiety levels and occurrences of needle stick injuries to both healthcare workers and patients Moreover, a magnetic-actuated device allows for control of the current supplied over time to the device and the corresponding depth of penetration of the drug

Substitutes for the sclera and vitreous region were used in the experiments where a blue dye was injected using the two separate devices to identify if these devices were able to eject the liquid with enough force needed to penetrate the sclera and deliver the liquid to within the vitreous region and whether there was a relationship between the current supplied to the devices and the depth of delivery  The solenoid prototype injector was not able to eject the liquid at a force required to penetrate the sclera although, because the vitreous region was a lot softer, a follow through current of about 1 3A - 1 5A was predicted to be able to deliver the bulk of the liquid to the middle portion of the vitreous substitute used in this experiment Moreover, the addition of a controller to the system was able to produce a two part force to the liquid, the initial peak force meant to penetrate the sclera and a follow through force to deliver the drug to the vitreous region only The E-shaped pairing injector prototype however, could not generate enough force to fully eject the liquid out of the

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