Suction-fixing surgical device for assisting liver manipulation with laparoscopic forceps

Nakajima, Yoshikazu; Suzuki, Rina; Suzuki, Yutaro; Sugino, Takaaki; Kawase, Toshihiro; Onogi, Shinya; Seki, Haruna; Fujiwara, Tatsuki; Ouchi, K.

doi:10.1007/s11548-020-02239-3

Cited by 2 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may be one of the optimal shapes in material mechanics. Compared with the rigidity gain of 5.48 reported in our previous paper, (6) FEM analysis gave a rigidity gain of 11.3, which is approximately twice as high. The reason might be that irregular stress unbalance and stiffness-sheet distortion, which occur in reality, such as sheet wrinkles, were not considered in the FEM simulation.…”

Section: Discussioncontrasting

confidence: 54%

“…As shown in Figs. 6(e) and 6(f), pillar pitch was varied as 1.5, 3.0, 6.0, and 9.0 mm. The pillar occupancy was changed from 10 to 90 in 10% increments.…”

Section: Fem Stress Computation and Optimization Of Beam Structurementioning

confidence: 99%

“…1. (5,6) The stiffness of the device was increased 5.47fold through automatic pneumatic control of the device interior. In addition, we showed the stiffness-tuning principle and the effectiveness of the wavy-bounded design of a hard and soft material composite.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, in recent decades, it has been used to optimize material structures, which is the essence of the research on material informatics. (6)(7)(8)…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Finite Element Method Analysis and Structure Design of Stiffness-tunable Beam-shaped Material

Nakajima¹,

Kawase²,

Suzuki³

et al. 2021

Sensors and Materials

Self Cite

View full text Add to dashboard Cite

Most surgical tools are made of metal or soft rubber, the stiffnesses of which may not be suitable for some surgeries. There is a need for stiffness-tunable materials for use in surgical tools or a mechanism for tuning the stiffness of a material without a chemical or thermal reaction. We have proposed a stiffness-tunable beam-shaped material with pneumatic access for stiffness control. We have also shown its application in grasping a soft organ stably during laparoscopic liver surgery. Its stiffness became 5.47 times greater by inducing -80 kPa negative pressure inside the device. The beam structure had a wavy composition of hard and soft rubbers. In this paper, we evaluate the finite element method (FEM) performance to determine the optimal design of the stiffness-tunable beam. FEM resulted in a 11.3-fold improvement of stiffness tuning for wavy shapes, that is, sequentially aligned pillars with an adequate pitch, and increased the stiffness, one of the shaping parameters, 11.8-fold.

show abstract

Section: Discussioncontrasting

confidence: 54%

“…As shown in Figs. 6(e) and 6(f), pillar pitch was varied as 1.5, 3.0, 6.0, and 9.0 mm. The pillar occupancy was changed from 10 to 90 in 10% increments.…”

Section: Fem Stress Computation and Optimization Of Beam Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In addition, in recent decades, it has been used to optimize material structures, which is the essence of the research on material informatics. (6)(7)(8)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Finite Element Method Analysis and Structure Design of Stiffness-tunable Beam-shaped Material

Nakajima¹,

Kawase²,

Suzuki³

et al. 2021

Sensors and Materials

Self Cite

View full text Add to dashboard Cite

show abstract

Improvement of a Tunable Stiffness Organ-Grasping Device by Design of a Wavy-Shaped Beam Structure

et al. 2021

View full text Add to dashboard Cite

Tunable stiffness mechanisms can increase the noninvasiveness and stability of organ manipulation in laparoscopic liver resection. We have developed an organ-grasping device using beam-shaped tunable stiffness mechanism. Increasing the change ratio of stiffness will improve the performance of the device by offering high flexibility when adhering to the liver surface and high rigidity during the manipulation of the liver; however, optimal design of the beam has not been investigated. In this study, we investigate the wavy structure shape of the device that enhances the change in the ratio of stiffness. To increase the stiffness in a high-stiffness state, we used principal stress lines in the device to design the edge curve of the wavy shape material in the beams. We also investigated the arrangement of the wavy shape to decrease the stiffness in a low-stiffness state. Simulation using finite element method showed that the change ratio of stiffness was improved up to 13.0 by the new wavy shape arranged with the uniformly thick bottom of the waves.

show abstract

Suction-fixing surgical device for assisting liver manipulation with laparoscopic forceps

Cited by 2 publications

References 16 publications

Finite Element Method Analysis and Structure Design of Stiffness-tunable Beam-shaped Material

Finite Element Method Analysis and Structure Design of Stiffness-tunable Beam-shaped Material

Improvement of a Tunable Stiffness Organ-Grasping Device by Design of a Wavy-Shaped Beam Structure

Contact Info

Product

Resources

About