... a relevant range of tubing lengths, needle lengths, and needle tip diameters. Data analysis showed that the silica tubing (∼150 μm bore diameter) adhered to within ±5% of the theoretical prediction by Poiseuille’s Law describing laminar internal pipe flow at Reynolds numbers less than 700. High hydraulic...

...Jadav Das; D. Caleb Rucker; Robert J. Webster, III Steerable needles offer the potential to turn corners during insertion, thereby avoiding obstacles, reducing tip placement error and enabling a less invasive access to challenging anatomical locations. In this paper, we describe an experimental...

...Conor Walsh; Jeremy Franklin; Alexander H. Slocum; Rajiv Gupta Precurved needles are used in a variety of medical applications for both passive and active control of instrument position. In one application, the deployment of a precurved stylet from a concentric outer cannula can be used to achieve...

... the liver organ. Since radio frequency (RF) needle is inserted into liver organ during tumor ablation, the proposed system with needle-based actuation making use of this inevitable insertion will be able to intra-operatively image the liver tumor during ablation. The RF needle can directly vibrate...

... needle prototypes for testing in a gelatin phantom such that puncture forces match those expected for the actual-size needle when puncturing tissue. Using Hertz contact force equations to account for the differences in prototype materials and size, as well as for the tissue phantom properties, 10× scale...

...Eric Busillo; Jonathan S. Colton A significant potential for plastic hypodermic needles exists as an alternative to current steel needles. This paper presents the design and testing of one type of plastic hypodermic needle. The buckling and penetration characteristics of the needles were modeled...

...Erik K. Bassett; Alexander Slocum Poor positioning of needles and catheters may result in repeated attempts at correct placement, injury to adjacent structures or infusions into inappropriate spaces. Existing catheter insertion methods do not uniformly provide feedback of the tip location, nor...

... review showed that each separate portion could be used in an effective device for minimally invasive, continuous glucose monitoring. 11 06 2008 biochemistry biomedical equipment biomedical measurement bioMEMS brain diseases needles obstetrics organic compounds patient monitoring...

...Conor J. Walsh; Nevan C. Hanumara; Alexander H. Slocum; Jo-Anne Shepard; Rajiv Gupta This paper describes Robopsy, an economical, patient-mounted, telerobotic, needle guidance and insertion system, that enables faster, more accurate targeting during CT-guided biopsies and other percutaneous...