Abstract
Current ultrasound-guided punctures are difficult to perform as they are performed at an angle to the ultrasound image of the affected area, resulting in longer puncture times, lower success rates, and higher unexpected injury rates. Vertical puncture techniques have also been investigated, but the principle of needle tip detection remains unclear. To optimize ultrasound probes for puncture, the principle of needle tip detection should be understood. This study aimed to verify the principle of needle tip detection and optimal measurement conditions for vertical puncture. Needle tip detection was performed in animal experiments using a probe with a central puncture slit. Moreover, the needle tip was detected at short distances using a puncture spacer. We also investigated the signal from the needle tip using a ring probe and confirmed the principle of needle tip detection, effect of needle tip angle, and insertion depth on needle tip detection through simulation and experiments. Needle tip detection using ultrasound-guided waves was described, and the relationship among needle tip angle, detection intensity, and phase change was verified. The needle tip can be detected by the leakage of the ultrasound-guided wave generated inside the needle tip.
Highlights
In the medical field, ultrasound-guided puncture of an affected area is performed while observing the position of the affected area and needle
We have developed two types of ultrasound probes for vertical puncture: a separate ring ultrasound probe for checking the needle tip detection signal and four different array probes for image processing
We performed a puncture while observing the needle tip in real time with a pig liver and confirmed that the slit for removing the probe did not affect the needle tip detection
Summary
Ultrasound-guided puncture of an affected area is performed while observing the position of the affected area and needle. A method for needle detection during puncture using ultrasound waves was reported by Kratochwil et al [2], Goldberg et al [3], Holm et al [4], and Itoh et al [5] In their studies, an ultrasound probe with a through-hole in the center was used for the puncture while monitoring the needle tip using A-mode images. Rasmussen et al [6] and Kristensen et al [7] performed liver and kidney biopsies by ultrasonically guided vertical puncture using an ultrasound probe with a through-hole These punctures were made while detecting both the affected area and needle tip and were easier than blind punctures, such as that in the Menghini method. These studies did not mention the principle of needle tip detection in vertical puncture
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