A model of optimising the needle insertion through deflection studies

Foo, Soo Leong; Ng, Ka Wei; Goh, Jin Quan; Ting, Poh Hua; Lee, Teck Kheng; Esuvaranathan, Kesavan; Wu, Qing; Chiong, Edmund

doi:10.1504/ijbet.2014.065654

Cited by 1 publication

(1 citation statement)

References 19 publications

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“…As the friction forces attract the surface along the needle shaft, the magnitude of cutting forces was not relatively constant, but marginally increased with navigation depth. 26,27 The model shows a non-linear relationship between the needle penetration force and gel medium navigation depth at different time points. Conical needle performs a smooth penetration model inside gel but in case of the blunt needle tip (Figure 7), in case of blunt tip, the increase in force graph was not smooth while at points 10-60 mm, force suddenly dropped due to maximum gel medium deformation at the location.…”

Section: Force Modeling Of Needle Navigation Into the Gelmentioning

confidence: 99%

Force modeling to develop a novel method for fabrication of hollow channels inside a gel structure

Barua

Giria

Datta

et al. 2019

Proc Inst Mech Eng H

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Fabrication of hollow channels with user-defined dimensions and patterns inside viscoelastic, gel-type materials is required for several applications, especially in biomedical engineering domain. These include objectives of obtaining vascularized tissues and enclosed or subsurface microfluidic devices. However, presently there is no suitable manufacturing technology that can create such channels and networks in a gel structure. The advent of three-dimensional bioprinting has opened new possibilities for fabricating structures with complex geometries. However, application of this technique to fabricate internal hollow channels in viscoelastic material has not been yet explored to a great extent. In this article, we present the theoretical modeling/background of a proposed manufacturing paradigm through which hollow channels can be conveniently fabricated inside a gel structure. We propose that a tip connected to a robotic arm can be moved in X-, Y-, and Z-axis as per the desired design. The tip can be moved by a magnet or mechanical force. If the tip is further trailed with porous tube and moved inside the viscoelastic material, corresponding internal channels can be fabricated. To achieve this, however, force modeling to understand the forces that will be required to move the tip inside viscoelastic material should be known and understood. Therefore, in our first attempt, we developed the computational force modeling of the tip movement inside gels with different viscoelastic properties to create the channels.

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Section: Force Modeling Of Needle Navigation Into the Gelmentioning

confidence: 99%