Anatomic Indications for Using Actuator-driven Pulsed Water Jet for Hepatectomy

2020 ◽  
Vol 30 (5) ◽  
pp. e33-e38
Author(s):  
Yota Kawasaki ◽  
Satoshi Iino ◽  
Tetsuya Idichi ◽  
Masahiko Sakoda ◽  
Kiyonori Tanoue ◽  
...  
Keyword(s):  
Water Jet ◽  
Pulsed Water Jet

New Application of Actuator-Driven Pulsed Water Jet for Spinal Cord Dissection: An Experimental Study in Pigs

2016 ◽  
Vol 78 (02) ◽  
pp. 137-143
Author(s):  
Jia Wenting ◽  
Atsuhiro Nakagawa ◽  
Hidenori Endo ◽  
Yuto Sagae ◽  
Masaki Iwasaki ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Experimental Study ◽  
Water Jet ◽  
Pulsed Water Jet

Non-Traditional Machining Using Pulsed Water Drops

2004 ◽  
Author(s):  
M. J. Jackson
Keyword(s):  
Experimental Data ◽  
Plane Surface ◽  
Water Jet ◽  
Surface Cracks ◽  
Response Characteristics ◽  
Water Jets ◽  
Jet Impact ◽  
Water Drops ◽  
Pulsed Water Jet ◽  
Traditional Manner

This paper discusses water jet machining of selected materials using a non-traditional way of delivering water jets in the form of a series of discrete pulses. The theory of water jet impact has been used to demonstrate the principle of removing material by exploiting the existence of a Rayleigh wave that excites the formation of surface cracks and the lateral outflow of water that extends the cracks and removes material. A mathematical model has been developed that predicts changes in the response characteristics of materials owing to an idealised representation of a finite jet of water impacting a plane surface. The analytical approach used is applicable to the first stages of impact where the compressibility of water in the droplet is significant. The predicted response characteristics are compared with experimental data generated using controlled water jet impacts produced by a specially constructed pulsed water jet machining centre. The predicted response of selected materials compare well with experimental data. The results presented in this paper illustrate the importance of using pulsed water jets as a way of machining materials in a non-traditional manner.

scholarly journals A laser-induced pulsed water jet for layer-selective submucosal dissection of the esophagus

LASER THERAPY ◽  
2016 ◽  
Vol 25 (3) ◽  
pp. 185-191
Author(s):  
T Nakano ◽  
C Sato ◽  
M Yamada ◽  
A Nakagawa ◽  
H Yamamoto ◽  
...  
Keyword(s):  
Water Jet ◽  
Submucosal Dissection ◽  
Pulsed Water Jet

A High-Pressure Pulsed Water Jet Cutting System by Means of Water Hammer in a Convergent Pipeline

2003 ◽  
Author(s):  
Koji Yamane ◽  
Hiromitsu Sasaki ◽  
Yuzuru Shimamoto
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Water Jet ◽  
Injection System ◽  
Source Pressure ◽  
Electromagnetic Valve ◽  
Water Jet Cutting ◽  
Pulsed Water Jet ◽  
Cutting System

One of the authors has developed a high-pressure fuel injection system using an oil hammer for diesel engines in 1993. In the present study, we applied this novel principle of the fuel injection system to the water-jet cutting system, and a pulsed water jet cutting system by means of water hammer in convergent pipeline caused by strong spool acceleration was developed. The system consisted of a pump having a small size plunger and spool, a convergent pipeline, and automatic injector having a hole-type nozzle with a small orifice. This pump, generating strong compression waves at the convergent pipeline inlet by strong acceleration of spool and plunger, is controlled by the low source oil pressure and electromagnetic valve. The wave propagated in the convergent pipeline is dynamically intensified by water hammering in the pipeline. High pressure is then developed at the nozzle. The injection pressure and injection frequency are fully controllable by the source pressure, and by the valve-opening frequency of the electromagnetic valve (EMPV). A computer simulation demonstrated that an operation and the injection pressure are satisfactory as a water jet cutting system. It is shown that a pressure of 140 MPa is obtained in nozzle inlet by a source pressure of 11.8MPa in experiments. The dimension of the nozzle orifice was determined by visualizing the spray origin using a laser-sheet imaging technique. Stagnation force and its spectrum of water jet on work was measured to evaluate effects of injection period and standoff distance on punching time and area. Practical feasibility of water jet cutting system was demonstrated by cutting/punching tests for soft/no-heating materials or metal plates and by paint removing tests.

Novel pulsed water jet system permits off-clamp partial nephrectomy in swine

2014 ◽  
Vol 21 (11) ◽  
pp. 1181-1182 ◽  
Author(s):  
Shinichi Yamashita ◽  
Yoshihiro Kamiyama ◽  
Atsuhiro Nakagawa ◽  
Yasuhiro Kaiho ◽  
Teiji Tominaga ◽  
...  
Keyword(s):  
Partial Nephrectomy ◽  
Water Jet ◽  
Pulsed Water Jet

scholarly journals Effect of Endoscope Flexibility on Tissue Dissection Profile Assessed With Pulsed Water Jet Device: Ensuring Safety, Efficacy, and Handling of Thin Devices for Neuroendoscopic Surgery

2020 ◽  
Author(s):  
Tetsuya Kusunoki ◽  
Tomohiro Kawaguchi ◽  
Atsuhiro Nakagawa ◽  
Yuta Noguchi ◽  
Shinichiro Osawa ◽  
...  
Keyword(s):  
Water Jet ◽  
Efficacy And Safety ◽  
Neuroendoscopic Surgery ◽  
Significant Difference ◽  
Tissue Dissection ◽  
Inner Diameter ◽  
The Mean ◽  
Pulsed Water Jet ◽  
The Impact ◽  
The Brain

Abstract Objective: We developed an actuator-driven pulsed water jet device (ADPJ) for flexible neuroendoscopy to achieve effective tissue dissection with vasculature preservation. Although flexibility is a strong advantage for minimally invasiveness, the effect of the ductile curvature on the dissection profiles remains unknown. The purpose of this study was to clarify the impact of the curvature change of the ADPJ connecting tube on the dissection safety and efficacy.Results: Three ADPJ connecting tubes with different inner diameters (1.0, 0.75, 0.5 mm) were used to dissect the brain phantom. They were bent at 3 angles: 0 °, 60 °, and 120 °. The dissection profiles were evaluated using the mean depth and coefficient of variation (CV) for efficacy and safety, respectively.The larger inner diameter connecting tube dissected more deeply. The dissection depth was not changed regardless of the curvature degree in each tube. There was no significant difference in CVs regardless of inner diameter and curvature. The ductile curvature of the flexible neuroendoscope did not affect the efficacy and safety of the ADPJ dissection profile. Among the numerous instruments, tube-formed devices, including suction and injecting devices such as ADPJ, can be used safely and effectively without flexibility-related limitations.

A review on continuous and pulsed water jet machining

2020 ◽  
Vol 27 ◽  
pp. 2596-2604 ◽  
Author(s):  
Piush Raj ◽  
Somnath Chattopadhyaya ◽  
Amitava Mondal
Keyword(s):  
Water Jet ◽  
Pulsed Water Jet

Optimal Design of a Pulsed Water Jet Nozzle

1995 ◽  
Author(s):  
Zheng Li ◽  
E. S. Geskin
Keyword(s):  
Material Removal ◽  
Flat Surface ◽  
Water Jet ◽  
Experimental Results ◽  
Optimal Angle ◽  
Jet Nozzle ◽  
Pulsed Water Jet ◽  
The One ◽  
Pulsating Water Jet ◽  
Better Than

Abstract The objective of this paper is to evaluate the effect of the geometry of downstream edge in the resonating cavity on the performance of a pulsating water jet nozzle. The operation of this nozzle is evaluated by numerical modeling of the water flow within the nozzle. A procedure of computer simulation is employed to examine the performance of the nozzle and the numerical simulation results are validated by the experiments. The nozzle is formed by the use of two conventional nozzles connected by a cavity and numerical and experimental results show that the downstream edge in the cavity has an important effect on the performance of the nozzle. The obtained information demonstrate that the downstream edge with geometry of concave shape is better than the one of convex and flat surface due to its convergent shape enhancing the focusing of the jet and thus increasing the jet kinetic energy. The numerical and experimental results show that the optimal angle of downstream edge is 75° for the best operation of the nozzle. The substantial increase of the rate of cleaning and erosion of such as aluminum, steel and titanium in the course of use of optimal designed nozzle is observed. The obtained computational results enable us to design an effective nozzle suitable for both material removal and surface processing.

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