probe holder
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2021 ◽  
Author(s):  
Giovanna Dipasquale ◽  
Pauline Coralie Guillemin ◽  
Maud Jaccard ◽  
Johannes W.E. Uiterwijk ◽  
Orane Lorton ◽  
...  

Abstract The authors have requested that this preprint be removed from Research Square.


Medicina ◽  
2021 ◽  
Vol 57 (2) ◽  
pp. 101
Author(s):  
Živilė Grabliauskienė ◽  
Roberta Zamaliauskienė ◽  
Greta Lodienė

Background and Objectives An accurate determination of the pulp status is relevant for a proper endodontic diagnosis. Objectives: The aim was to develop a universal pulse oximeter probe holder for measuring the oxygen saturation and to evaluate the use of pulse oximetry as a test for pulp vitality, by comparing the levels of oxygen saturation in the index finger and in the healthy dental pulp. Materials and Methods The universal holder was designed with software and printed with a 3D printer. The study was carried out on 128 healthy teeth. They were divided into eight groups according to tooth type. Ten root canal treated teeth served as a negative control group. For each patient, a pulse oximeter was first applied on the tooth followed by the index finger. The significance level (α) was set at 0.05. Results: The developed and manufactured universal pulse oximeter probe holder was suitable to measure the pulp vitality of all types of teeth. The handle allowed for holding the pulse oximeter on the tooth in parallel, firmly and securely. Significantly higher oxygen saturation was observed in the index finger (97.22%) compared to the dental pulp (93.17%) (p < 0.001). No correlation was observed between the maxillary teeth and index finger oxygen saturation values (r = 0.05, p = 0.72), whereas, between the mandibular teeth and index finger, a positive correlation was detected (r = 0.29, p = 0.02). There were no significant differences in the pulp oxygen saturation values between different teeth groups. Conclusion: The newly developed universal pulse oximeter probe holder is an effective device for pulp vitality testing.


Author(s):  
Smruti Mahapatra ◽  
Tarana Parvez Kaovasia ◽  
Sufia Ainechi ◽  
Ana Ainechi ◽  
Molly Acord ◽  
...  

Abstract Standard diagnostic ultrasound imaging procedures heavily rely on a sonographer for image acquisition. Given the ultrasound probe is manually manipulated by the sonographer, there is a potential for noise artifacts like blurry acquired images caused by involuntary hand movements. Certain surgical procedures can also cause patients to exhibit involuntary “jumping” movements while on the operating table leading to further deterioration in ultrasound image quality. In this study, we attempt to mitigate these problems by fabricating a 3D-printed ultrasound probe holder. Due to the lightweight nature of the device, it can attach to surgical retractors without influencing the functionality of the retractor. Therefore, the 3D printed probe holder not only reduces relative motion between the probe and the patient, but also reduce the need for a sonographer during complex surgeries.


Author(s):  
Cunjian Miao ◽  
Yinkang Qin ◽  
Weican Guo ◽  
Chengmin An ◽  
Zhangwei Ling ◽  
...  

Abstract Polyethylene pipe has been used widely in gas transportation and nuclear safety-related cooling water applications due to its exceptional resistance to corrosion and erosion. Butt fusion joint is one of the main welding forms for polyethylene pipes. Ultrasonic technique is a typical nondestructive examination technique. To overcome the coupling problems when inspecting butt fusion structures, an inspection technique of ultrasonic phased array using water wedge is proposed to solve the coupling matching and to increase the ultrasound amplitudes. The influences on the imaging of the parameters (such as the angle and height of the water wedge), the array element specifications, and the aperture, were investigated via simulations. The parameter optimization was conducted to establish a suitable detection process. After that, the related probe and a simulated water wedge were designed based on the results and manufactured, in which the simulated wedge as a specific probe holder could adjust its own incident angle and array height. Meanwhile, a typical DN315 pipe of PE 100 was made with some typical artificial defects in it. Experiments were conducted, and the results showed that the proposed water-wedged ultrasonic phased array technique is suitable for butt fusion joint inspection.


2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Yoshimune Osaka ◽  
Yoshihisa Morita
Keyword(s):  

Author(s):  
Cunjian Miao ◽  
Weican Guo ◽  
Xingji Du ◽  
Zhangwei Ling

Elbows in pressure pipes are important parts in the pipe inspection, which may become serious corrosion locations. Ultrasonic detection is a main technique for pipe inner inspection, and the use of traditional ultrasound and phased array technique for in-line inspection are advanced, long-term interesting and known by researchers. Several devices were invented for inside pipeline inspection and is suitable to some extent such as detecting long-distance pipelines. However, elbows especially tight elbows are still difficult to implement inner detection or travelling. To obtain a good effect in detecting elbows with ultrasound, the inner inspection technique was investigated. Spherical and flat cylindrical probe holder structures were proposed to ensure the ability to pass through elbows, while the spherical holder has a large number of conventional probes in its shell with a uniform arrangement and was designed to give a full view for ultrasonic detecting. As regards the flat cylindrical probe structures, it is more suitable for phased array ultrasonic technique to form a convex array. Both methods were proposed for better echo directions and amplitudes, and aimed to obtain the information of elbow characteristics. CIVA simulation was conducted based on the above design, and the focal effects were analyzed. Comparing with detecting precision and manufacture process, the phased array technique with flat cylindrical probe holder was chosen, and its device manufacturing and elbow inspection experiments were carried out. CIVA simulation was also used to analyze the influence of array and element parameters on the echo detection, and the design parameters were determined about the convex phased array. The experimental elbow was designed and manufactured with specific artificial defects. The ultrasonic system was taken by a robot to travel through the elbow, and the experimental data were used to verify the applicability of the ultrasonic inspection technique.


Author(s):  
Filip Jelínek ◽  
Gernot Kronreif ◽  
Cor van de Wardt

Image-guided adaptive brachytherapy (IGABT) is a promising method for precise targeting and treatment of cervical and prostate cancer where one can adapt the radiation delivery according to tumor spread and organs at risk (OAR). The currently developing procedural modality incorporating optical tracking and transrectal ultrasound (TRUS) for superior soft tissue contrast, later combined with CT data, will likely develop into a readily affordable option, as the use of MRI will become unnecessary [1]. This is especially relevant for developing countries (mainly in SE Africa and S America) where the MRI scanners are scarce and the occurrence specifically of cervical cancer is the highest worldwide [2]. In brachytherapy, the procedure requires either the use of an active source (cervix) or implantation of radioactive seeds (prostate) in an accurate way as to enable sufficient safety margin with respect to the OAR. The sources irradiate the tissue of interest through gynecological (GYN) applicators (inserted internally) as well as hollow needles guided by either these applicators or prostate templates (positioned externally). Due to the localized use of several devices, an uninterrupted verification of source or needle placement can only be provided if the TRUS probe scans the volume of interest without much movement, likely leading to physical interference. Hence, the longitudinal ultrasound (US) array is used to obtain a 3D-US volume using a rotational sweep. The use of a TRUS probe for an automatic US image reconstruction requires the probe to be housed in a motorized unit, a so-called stepper or a probe holder, which should ideally be integrated seamlessly into the overall procedure without impeding the established workflow or imposing any unnecessary space and time restrictions within the operating room (OR). Seamless integration should also mean minimal assembly steps required by the OR staff, whether nurses or surgeons themselves, as well as the possibility to use the TRUS probe in a natural unrestricted way. More specifically, when housed in the stepper, the probe’s geometry and weight should not be exaggerated as to allow enough haptic feedback for the surgeon when guiding the probe through the bodily cavities or probing for any unnatural or pathological tissue. Examples of conventional brachytherapy steppers include Mikrostepper MST 200 (GfM, Riedstadt-Leeheim, Germany), Transperineal Stepper (D&K Technologies, Barum, Germany), AccuCARE™ Classic Stepper (Civco, Coralville, IA, USA), STP 110 Precision™ Stepper (Best NOMOS, Pittsburgh, PA, USA), or OncoSelect Stepper equipped with EndoCavity Rotational Mover (Elekta, Veenendaal, NL). Each of these devices provides precise rotational and translational fine-tuning, motorized image acquisition as well as high positioning rigidity. Yet, in most cases, this is at the expense of their oversized dimensions, large mass often requiring a counterweight, limited range of motion or cumbersome handling. As a result, their overall usability is compromised, especially in applications requiring better haptic experience, such as an initial free-hand scan during GYN brachytherapy. Hence, the aim of this paper is to present a novel, compact and versatile solution compensating for the aforementioned limitations and enabling seamless integration.


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