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Towards a Procedure-Optimised Steerable Catheter for Deep-Seated Neurosurgery.

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Summary

Researchers developed a new manufacturing method for steerable needles using thermal drawing technology. This technique successfully miniaturized programmable bevel-tip needles (PBNs) for minimally invasive surgery applications.

Keywords:
medical roboticsminimally invasive surgeryneedle steeringthermal drawing

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Area of Science:

  • Medical Devices
  • Surgical Technology
  • Materials Science

Background:

  • Steerable needles, particularly programmable bevel-tip needles (PBNs), are crucial for minimally invasive surgery (MIS).
  • Previous PBN prototypes (2.5 mm) demonstrated feasibility for convection-enhanced delivery (CED) in vivo.
  • Further miniaturization is essential for PBNs to access deep-seated tissues in various diagnostic and therapeutic procedures.

Purpose of the Study:

  • To introduce and evaluate a novel manufacturing method for miniaturized PBNs using thermal drawing technology.
  • To assess the feasibility of producing complex cross-section needle geometries below 2.5 mm.
  • To compare the characteristics of thermally drawn (TD) PBNs with existing PBN prototypes.

Main Methods:

  • Development of a thermal drawing process for PBN fabrication.
  • Manufacturing of a 1.3 mm thermally drawn (TD) PBN prototype.
  • Experimental characterization of both 2.5 mm PBN and 1.3 mm TD-PBN prototypes.

Main Results:

  • Thermal drawing technology enables significant miniaturization of complex PBN structures.
  • The 1.3 mm TD-PBN prototype was successfully fabricated.
  • Initial steering performance was impacted by material selection, indicating an area for future optimization.

Conclusions:

  • Thermal drawing is a promising manufacturing approach for creating smaller, complex steerable needles.
  • Further material research is required to optimize the steering capabilities of TD-PBNs.
  • This advancement paves the way for PBNs in a wider range of MIS applications requiring deep tissue access.