Validation of a Light Aspiration Device for In Vivo Soft Tissue Characterization (LASTIC)

Luboz, Vincent; Promayon, Emmanuel; Chagnon, Grégory; Alonso, Thierry; Favier, Denis; Barthod, Christine

doi:10.1007/8415_2012_123

Cited by 9 publications

(12 citation statements)

References 7 publications

(9 reference statements)

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“…1). Authors usually propose to measure the aspired height using different methods such as ultrasound 13,15 , mechanical stops 16 or cameras, associated to mirrors or prisms 17,18,19,20,21,22,23,24,25 . Yet, as ultrasound methods are expensive and add additional experimental constraints, optical methods are usually preferred in practical cases to provide pressure versus apex height characteristic curves.…”

Section: Introductionmentioning

confidence: 99%

“…(1) As a camera can not go through severe sterilization processes, its contact with tissues must be prevented, which constrained authors to propose complex designs, usually using mirrors or prisms 18,25,17,19,20,21,22,23,24 . (2) The use of cameras and mirrors requires accurate relative positioning, which lead to design systems that are large and rigid 17,22 .…”

Section: Introductionmentioning

confidence: 99%

“…Yet, using an external camera induced measurements errors due to misalignment. The authors thus designed a two part Light Aspiration device for in-vivo Soft TIssue Characterization (LASTIC) 23,22 (Fig. 2a).…”

Section: Introductionmentioning

confidence: 99%

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DISPOSABLE SYSTEM FOR IN-VIVO MECHANICAL CHARACTERIZATION OF SOFT TISSUES BASED ON VOLUME MEASUREMENT

Elahi

Connesson

2018

J. Mech. Med. Biol.

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In-vivo characterization of soft tissues is a key step toward biomechanical simulation and planning of intra-operative assisted surgery. To achieve this, aspiration method is a standard technique: tissue is aspirated through a hole while measuring the pressure and associated apex height. An inverse problem is then solved to identify the material mechanical properties. In the literature, the apex height is usually measured using a camera, which induces design difficulties, in particular in regards on the required sterilization process for in-vivo measurements. In this paper, the idea is to replace the apex height optical measurement by the measurement of the aspirated tissue volume. The proposed method enables to reduce the system head to a simple tube: sterilizations becomes easy and the system is disposable after use. The proposed system is thus the simplest, lightest and cheapest one could achieve. It is also to the authors knowledge the first time ever in aspiration method that the aspired volume is the extracted data. As the data signal-to-noise ratio is the main factor impacting any applied inverse method when extracting the mechanical properties, the aim of this work is to assess and compare the experimental signal-to-noise ratio in the raw volume measurements obtained either optically or with the method proposed. Explicit results of inverse methods using volumes as input data are not presented in this paper for concision purpose. The effects on accuracy of various experimental parameters has been investigated and quantified: the volume measurement has proved to present a same order or even better signal-to-noise ratio compared to optical measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DISPOSABLE SYSTEM FOR IN-VIVO MECHANICAL CHARACTERIZATION OF SOFT TISSUES BASED ON VOLUME MEASUREMENT

Elahi

Connesson

2018

J. Mech. Med. Biol.

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“…The ArtiSynth framework provides a very efficient computational formulation for the coupled simulation of rigid and deformable structures, with a constraint-based mechanism for attaching bones and soft tissues and the use of semi-implicit time integration [20]. The bones are therefore represented as rigid body surfaces in our model.…”

Section: Bones and Jointsmentioning

confidence: 99%

Foot ulcer prevention using biomechanical modelling

Luboz

Perrier

Stavness

et al. 2013

Computer Methods in Biomechanics and Biomedical Engineering: Im

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International audienceFoot ulcers are a common complication of diabetes and are the consequence of trauma to the feet and a reduced ability to perceive pain in persons with diabetes. Ulcers appear internally when pressures applied on the foot create high internal strains below bony structures. It is therefore important to monitor tissue strains in persons with diabetes. We propose to use a biomechanical model of the foot coupled with a pressure sensor to estimate the strains within the foot and to determine if they can cause ulcer formation. Our biomechanical foot model is composed of a Finite Element mesh representing the soft tissues, separated into four Neo Hookean materials with different elasticity: plantar skin, non-plantar skin, fat and muscles. Rigid body models of the bones are integrated within the mesh to rigidify the foot. Thirty-three joints connect those bones around cylindrical or spherical pivots. Cables are included to represent the main ligaments in order to stabilize the foot. This model simulates a realistic behavior when the sole is subjected to pressures measured with a sensor during bipedal standing. Surface strains around 5 % are measured below the heel and metatarsal heads while internal strains are close to 70 %. This strain estimation, when coupled to a pressure sensor, could consequently be used in a patient alert system to prevent ulcer formation

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“…Due to the pressure difference, the portion of the tissue under the aperture is partially aspirated. For a given pressure difference, authors usually propose to measure the aspirated tissue height using different methods such as ultrasound [11,14], mechanical stops [15] or cameras, associated with mirrors or prisms [16][17][18][19][20][21][22][23][24]. These measurement methods yet meet different challenges:…”

Section: Introductionmentioning

confidence: 99%

In-Vivo Soft Tissues Mechanical Characterization: Volume-Based Aspiration Method Validated on Silicones

2019

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Simulating the deformations of soft tissues has gained importance in recent years due to the development of 3D patient-specific biomechanical models in the context of Computer Assisted Medical Interventions. To design such models, the mechanical behavior of each soft tissue has to be characterized in-vivo. In this paper, a volume-based aspiration method for in-vivo mechanical characterization of soft tissues was validated on synthetic materials. For this purpose, two silicones with slightly different stiffnesses were made. Samples were characterized using (1) aspiration, and, as references, two classical tests such as (2) uniaxial and (3) equibiaxial extension tests. Performing a Finite Element (FE) inverse identification on the experimental results provided Young's moduli similar to classical tests with about 7% maximum overestimation for the two silicones. This highlighted a significant improvement of the measurement method accuracy compared to the literature (about 30% relative overestimation).

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Validation of a Light Aspiration Device for In Vivo Soft Tissue Characterization (LASTIC)

Cited by 9 publications

References 7 publications

DISPOSABLE SYSTEM FOR IN-VIVO MECHANICAL CHARACTERIZATION OF SOFT TISSUES BASED ON VOLUME MEASUREMENT

DISPOSABLE SYSTEM FOR IN-VIVO MECHANICAL CHARACTERIZATION OF SOFT TISSUES BASED ON VOLUME MEASUREMENT

Foot ulcer prevention using biomechanical modelling

In-Vivo Soft Tissues Mechanical Characterization: Volume-Based Aspiration Method Validated on Silicones

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