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Your search keyword '"Keigo Makino"' showing total 2 results
Start Over Author "Keigo Makino" Journal neurologia medico-chirurgica
2 results on '"Keigo Makino"'

1. Important Notes for Preventing Entrapment of Distal Filter-based Embolic Protection Device in Carotid Artery Stenting

Author

Juntaro FUJITA, Nobuyuki HIROTSUNE, Yuki MATSUDA, Osamu HAMASAKI, Shoichi FUKUDA, Yoshihiro OKADA, Aiko KOBASHI, Shohei NISHIGAKI, Keigo MAKINO, Yusuke TOMITA, Naoya KIDANI, Kenichiro MURAOKA, and Shigeki NISHINO

Subjects
carotid artery stenting, distal filter-based embolic protection device, complication, Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571
Abstract

Failure to retrieve a distal filter-based embolic protection device (EPD) is a potential complication of carotid artery stenting. This may be caused by trapping of the proximal marker of the EPD within the stent tip marker. Maintaining an adequate distance between the two can prevent this. We examined the behavior of several stent-filter-based EPD combinations, focusing on their propensity to become trapped or disengage in vitro. Four physicians subjectively rated the force required to result in trapping using a 5-point scale. Moreover, the force required to disengage trapped devices was evaluated. The Casper stent-Spider FX EPD combination was difficult to disengage when entrapment occurred, which suggested that this phenomenon tended to occur with this combination. The stent tip marker of the closed-cell stents advanced as they shortened, which may be a unique feature of closed-cell stents. Although trapping is uncommon, it can cause serious complications. To prevent these complications, device characteristics should be well understood before they are used in patients.

Published
2024
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2. Ultra-high-molecular-weight Polyethylene (UHMWPE) Wing Method for Strong Cranioplasty

Author

Nobushige Tsuboi, Kazuki Kobayashi, Noriyuki Nagayama, Hideyuki Yoshida, Yuu Takahashi, Ryu Kimura, Tadato Yukiue, Takao Yasuhara, Susumu Sasada, Ryo Mizuta, Tomoyuki Ogawa, Isao Date, and Keigo Makino

Subjects
Artificial bone, animal structures, medicine.medical_treatment, Finite Element Analysis, finite element analyses, chemistry.chemical_compound, Animals, Humans, Medicine, ultra-high-molecular-weight polyethylene, artificial bone, Ultra-high-molecular-weight polyethylene, Wing, business.industry, Shunt malfunction, Prostheses and Implants, Cranioplasty, Screw loosening, chemistry, Normal position, cranioplasty, Original Article, Surgery, Neurology (clinical), Polyethylenes, business, Biomedical engineering
Abstract

We developed a new cranioplasty method that utilizes artificial bone made of ultra-high-molecular-weight polyethylene, with a wedge-shaped edge (UHMWPE Wing). This study shows the methods and data of case series and finite element analyses with the UHMWPE Wing. A circumferential wing was preoperatively designed for a custom-made artificial bone made of UHMWPE to achieve high fixed power and to minimize the usage of cranial implants. Here, we present 4 years of follow-up data and finite element analyses for patients treated with the UHMWPE Wing between February 2015 and February 2019. Eighteen consecutive patients underwent cranioplasty using our UHMWPE Wing design. There were no postoperative adverse events in 17 of the patients for at least 18 months. One case of hydrocephalus experienced screw loosening and graft uplift due to shunt malfunction. Placement of a ventriculo-peritoneal shunt immediately returned the artificial bone to normal position. Finite element analyses revealed that a model using the UHMWPE Wing had the highest withstand load and lowest deformation. This is the first report on the UHMWPE Wing method. This method may enable clinicians to minimize dead space and achieve high strength in cranioplasty.

Published
2021
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