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. 2018 May 30:2018:4534579.
doi: 10.1155/2018/4534579. eCollection 2018.

Method for Calculating the Bending Angle of Puncture Needle in Preoperative Planning for Transjugular Intrahepatic Portal Systemic Shunt (TIPS)

Xiaoli Zhu  1 , Zhao Ran  2 , Wanci Li  1 , Wansheng Wang  1 , Kangshun Zhu  3 , Wensou Huang  3 , Xin Gao  2
Affiliations

Method for Calculating the Bending Angle of Puncture Needle in Preoperative Planning for Transjugular Intrahepatic Portal Systemic Shunt (TIPS)

Xiaoli Zhu et al. Comput Math Methods Med. .

Abstract

Transjugular Intrahepatic Portal Systemic Shunt is a comprehensive interventional therapy for portal hypertension. During this intervention, puncturing from hepatic vein into portal vein is a difficult step. Selecting puncture needle with a proper bending angle is vital to accurate puncture. Thus, this prospective study provides a method to calculate the angle of the puncture needle using preinterventional contrast-enhanced CT imaging. According to the geometrical characteristics of puncture needle, Bezier curve equation was adopted to describe its bending part. By testing whether each point in a specific region satisfied the equation set of Bezier curves, the possible position of needle tip was obtained. Then, the bending angle of puncture needle was obtained by calculating curvature. The method was evaluated in 13 patients from 2 centers showing now a success rate of 100% and a duration of the procedure of 141 and 161 minutes. The method based on Bezier curve equation for calculating a proper bending angle of puncture needle was proven to be effective. And the clinical study is preliminary and additional work for clinical evaluation is necessary.

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Figures

Figure 1
Figure 1
Schematic illustration of puncture path planning.
Figure 2
Figure 2
Puncture needle and its bending angle.
Figure 3
Figure 3
Projecting the 3D coordinate system into a 2D coordinate system. The gray plane was the puncture plane.
Figure 4
Figure 4
(a) Two-order Bezier curve. (b) Bezier curve matching puncture needle.
Figure 5
Figure 5
(a) Change of the bending part of puncture needle. (b) Change of corresponding Bezier curve in Mathematica.
See this image and copyright information in PMC

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