Evaluation of the effect of catheter on the guidewire motion in a blood vessel model by physical and numerical simulations

Takashima, Kazuto; Oike, Atomu; Yoshinaka, Kiyoshi; Yu, Kaihong; Ohta, Makoto; Mori, Koji; Toma, Naoki

doi:10.1299/jbse.17-00181

Cited by 9 publications

(27 citation statements)

References 19 publications

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“…In Refs. 13, 18, 29, 38, 40, 76, 77–80, 81, and 82, the instrument is modeled as rigid bodies connected to their neighbors by joints, and the Newton–Euler equations are used to describe the translational and rotational dynamics 38 , 76 , 77 , 80 , 83 . Since the speed of propagating the instrument is slow, the Newton–Euler equations are typically simplified by neglecting inertia and centrifugal force.…”

Section: Resultsmentioning

confidence: 99%

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Navigation of guidewires and catheters in the body during intervention procedures: a review of computer-based models

et al. 2018

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Guidewires and catheters are used during minimally invasive interventional procedures to traverse in vascular system and access the desired position. Computer models are increasingly being used to predict the behavior of these instruments. This information can be used to choose the right instrument for each case and increase the success rate of the procedure. Moreover, a designer can test the performance of instruments before the manufacturing phase. A precise model of the instrument is also useful for a training simulator. Therefore, to identify the strengths and weaknesses of different approaches used to model guidewires and catheters, a literature review of the existing techniques has been performed. The literature search was carried out in Google Scholar and Web of Science and limited to English for the period 1960 to 2017. For a computer model to be used in practice, it should be sufficiently realistic and, for some applications, real time. Therefore, we compared different modeling techniques with regard to these requirements, and the purposes of these models are reviewed. Important factors that influence the interaction between the instruments and the vascular wall are discussed. Finally, different ways used to evaluate and validate the models are described. We classified the developed models based on their formulation into finite-element method (FEM), mass-spring model (MSM), and rigid multibody links. Despite its numerical stability, FEM requires a very high computational effort. On the other hand, MSM is faster but there is a risk of numerical instability. The rigid multibody links method has a simple structure and is easy to implement. However, as the length of the instrument is increased, the model becomes slower. For the level of realism of the simulation, friction and collision were incorporated as the most influential forces applied to the instrument during the propagation within a vascular system. To evaluate the accuracy, most of the studies compared the simulation results with the outcome of physical experiments on a variety of phantom models, and only a limited number of studies have done face validity. Although a subset of the validated models is considered to be sufficiently accurate for the specific task for which they were developed and, therefore, are already being used in practice, these models are still under an ongoing development for improvement. Realism and computation time are two important requirements in catheter and guidewire modeling; however, the reviewed studies made a trade-off depending on the purpose of their model. Moreover, due to the complexity of the interaction with the vascular system, some assumptions have been made regarding the properties of both instruments and vascular system. Some validation studies have been reported but without a consistent experimental methodology.

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Section: Resultsmentioning

confidence: 99%

“…Different materials can be used to fabricate the phantom model. For example, to test a guidewire or a catheter behavior, phantom’s materials used in the literature include polyvinyl alcohol (PVA), 102 PVA-hydrogel (PVA-H), 38 , 80 , 103 PVA-H and silicone (high transparency), 104 and PVA-cryogel 105 …”

Section: Resultsmentioning

confidence: 99%

Navigation of guidewires and catheters in the body during intervention procedures: a review of computer-based models

et al. 2018

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“…Various catheter simulators using a computer or blood vessel biomodels have been developed to improve safety in endovascular treatments [20]. Using the tactile sensor, accurate determination of the physical parameters for the numerical simulation and the evaluation of the biomodels could become possible.…”

Section: Tactile Sensor For Medical Applicationsmentioning

confidence: 99%

“…9, I is proportional to u. Therefore, in this study, we employed faster insertion velocities than those used during the guidewire and catheter insertions [20]. In practical use, it is necessary to move the sensor faster at the area the surgeons want to measure.…”

Section: Insertion Into Blood Vessel Modelmentioning

confidence: 99%

Development of catheter-type tactile sensor composed of polyvinylidene fluoride (PVDF) film

et al. 2019

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To achieve quantitative palpation in vivo, we developed a catheter-type tactile sensor composed of a polyvinylidene fluoride film for minimally invasive surgery. We evaluated the fundamental performance of the prototype sensor by a weight-drop test. We also measured the output of the prototype sensor as it was inserted into a blood vessel model with shapes mimicking lesions. The ø2-mm sensor passed easily into the blood vessel model with lesion-like shapes. Sensor outputs corresponded to the shape of the inner wall of the blood vessel model, making it possible to determine the position of a protrusion and the convexity interval of a rough surface by filtering and frequency analysis of the output.

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“…Due to the lack of a standard for friction tests among different guidewires, one may adopt a test that is close to the scenarios of the guidewire application yet simplified. In an application, a guidewire slides against a soft and curved blood vessel . We set up an apparatus to simulate this process (Figure g).…”

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confidence: 99%

Hydrogel Paint

et al. 2019

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For a hydrogel coating on a substrate to be stable, covalent bonds polymerize monomer units into polymer chains, crosslink the polymer chains into a polymer network, and interlink the polymer network to the substrate. In existing methods of hydrogel coating, the three processespolymerization, crosslinking, and interlinking-usually concur. This concurrency is unnecessary and hinders the widespread applications. In particular, many hydrogels are made by free-radical polymerization, involving toxic monomers, toxic initiators, and oxygen-free environment. For example, in the free-radical polymerization of a covalently crosslinked polyacrylamide hydrogel, when subject to UV light, the vinyl groups of acrylamide monomer and N,N′-methylenebisacrylamide crosslinker are activated concurrently. The former results in polyacrylamide chains and the latter results in a polyacrylamide network. When the substrate is involved, polymerization of monomers, crosslinking of poly mer chains, and interlinking between the hydrogel and substrate proceed concurrently. Since free radical polymerization is sensitive to oxygen, molding is usually required. Besides, molding is also used to control the shape and thickness of hydrogel coating. Depending on the geometry of the substrate, coating can be technically challenging for highly curved surfaces (e.g., 1D structures), or even impossible for hollow or cage structures. Furthermore, the monomers (e.g., acrylamide, acrylic acid, etc.) are usually toxic. Consequently, free-radical polymerization is unsuitable for everyday operation.For a hydrogel coating on a substrate to be stable, covalent bonds poly merize monomer units into polymer chains, crosslink the polymer chains into a polymer network, and interlink the polymer network to the substrate. The three processes-polymerization, crosslinking, and interlinking-usually concur. This concurrency hinders widespread applications of hydrogel coatings. Here a principle is described to create hydrogel paints that decouple polymerization from crosslinking and interlinking. Like a common paint, a hydrogel paint divides the labor between the paint maker and the paint user. The paint maker formulates the hydrogel paint by copolymerizing monomer units and coupling agents into polymer chains, but does not crosslink them. The paint user applies the paint on various materials (elastomer, plastic, glass, ceramic, or metal), and by various operations (brush, cast, dip, spin, or spray). During cure, the coupling agents crosslink the polymer chains into a network and interlink the polymer network to the substrate. As an example, hydrogels with thickness in the range of 2-20 µm are dip coated on medical nitinol wires. The coated wires reduce friction by eightfold, and remain stable over 50 test cycles. Also demonstrated are several proofofconcept applica tions, including stimuliresponsive structures and antifouling model boats.A hydrogel-coated substrate unites the superior properties of the substrate (e.g., strength, stiffness, and toughness) and the superior p...

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Evaluation of the effect of catheter on the guidewire motion in a blood vessel model by physical and numerical simulations

Cited by 9 publications

References 19 publications

Navigation of guidewires and catheters in the body during intervention procedures: a review of computer-based models

Navigation of guidewires and catheters in the body during intervention procedures: a review of computer-based models

Development of catheter-type tactile sensor composed of polyvinylidene fluoride (PVDF) film

Hydrogel Paint

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