The fragmentation efficiency on Bego artificial stones during lithotripsy and the propulsive effect (via video tracking) was investigated for a variety of laser settings. A variation settings (pulse energy, pulse duration, repetition rate) altered total application time required stone fragmentation, break up time, propulsion. obtained results can be used to develop devices providing an optimal combination low propulsion high efficacy, which then evaluated in clinical setting. Additionally,...

Knowledge of tissue optical properties, in particular the absorption μa and reduced scattering coefficient μs′, is required for diagnostic therapeutic applications which light distribution during treatment has to be known. As it generally very difficult obtain this information with sufficient accuracy vivo, properties are often approximately determined on ex vivo samples. In case, obtained may strongly depend sample preparation. The extent expectable preparation-dependent differences was...

Abstract In order to evaluate the technical adaptability of a type disposable endoscope compared reusable flexible endoscopes, in vitro and vivo studies were conducted. A digital ureteroscope (“chip on tip”) two endoscopes investigated with respect spatial resolution, geometric distortion air water maximum. Additionally, clinical performance device was tested during procedures (n = 20). The showed an optical resolution 6.72 lines/mm at 10 mm distance, similar other devices. comparison,...

Abstract Objectives Fluorescence spectroscopy of human urine is a method with the potential to gain importance as diagnostic tool in medical field, e.g., for measuring Coproporphyrin III (CPIII) an indicator cancer and acute types porphyria. Food can change urine's color, which could influence fluorescence spectrum detection CPIII urine. To determine if there noticeable on or urine, 16 vitamin supplements, three food items were tested. Such investigation may also prevent false interpretation...

Ureteroscopic laser lithotripsy is an important and widely used method for destroying ureter stones. It represents alternative to ultrasonic pneumatic techniques. Although these techniques have been thoroughly investigated, the influence of some physical parameters that may be relevant further improve treatment results not fully understood. One crucial topic propulsive stone movement induced by applied pulses. To simplify speed up optimization in this regard, a video tracking was developed...

Abstract This manuscript summarizes the laser‐induced method for destruction of kidney stones. Special emphasis is placed on lithotripsy, and a historical overview given from early beginnings in 1968 to current developments. New laser parameter settings have be tested order characterize novel devices best clinical results meet demanding medical needs. At present, stones are usually dusted, which makes it possible flush these tiny fragments out urinary system without having remove larger...

Indication of ureteroscopy for the treatment urolithiasis has expanded immensely over last decade. Fiber-optic and digital reusable instruments present standard in clinical practice, but various newly available single-use devices might offer an exciting alternative. To date, evidence is limited to evaluation efficacy ureteroscopes (URS) compared instruments. Therefore, we evaluate a instrument's characteristics direct comparison with fiber-optic device.A prospective study was conducted...

Laser lithotripsy is the preferred application for destruction of ureteral and kidney stones. Clinically Ho:YAG lasers (λ=2.1µm) are used due to high absorption by water induce thermomechanical ablation. This study focussed on investigation different laser parameters in relation stone efficiency. Experiments were performed using clinical available energy transferred via a standard fibre (Ø: 365µm) onto phantom calculi (Bego-Stones hardness) an aquarium set-up. Dusting can be reached most...

Interstitial photodynamic therapy (iPDT) is currently being investigated as a light-based treatment option for highly malignant brain tumours (glioblastomas/GBM). To obtain sufficient irradiation of the tumour, quantitative knowledge about light propagation in tissue required dosimetry calculations underlying clinical planning. individualize calculations, optical properties irradiated need to be determined in-vivo. A novel approach this purpose based on direction-resolved detection within...

Abstract Objectives For the development and validation of diagnostic procedures based on microscopic methods, knowledge about imaging depth achievable resolution in tissue is crucial. This poses challenge to develop a artificial phantom focused instead macroscopic optical characteristics. Methods As existing phantoms designed for image forming systems are primarily targeted at wide field applications, they unsuited reaching formulated objective. Therefore, microscopy‐ microendoscopy‐suited...

Existing optical tissue phantoms are usually designed for wide field imaging systems and not readily usable microscopic or endoscopic systems, especially such without any z-stage. Therefore a fs-laser microstructured artificial phantom with adaptable geometric, tissue-optical localized fluorescence properties enabling comparison testing of different microscopic/endoscopic was designed, characterized tested.

You have accessJournal of UrologyStone Disease: Surgical Therapy I1 Apr 2018PD35-09 ENDOSCOPIC CLEARANCE LITHOTRIPSY DEVICES: COMPARISON OF STONE ELIMINATION CAPACITY AND DRILLING SPEED Markus Bader, Thomas Pongratz, Maximilian Eisel, Ronald Sroka, Christian Stief, and Frank Strittmatter BaderMarkus Bader More articles by this author , PongratzThomas Pongratz EiselMaximilian Eisel SrokaRonald Sroka StiefChristian Stief StrittmatterFrank View All Author...

Thermography is a widespread non-contact imaging method for determining temperature. Its application in medicine, however, has so far been limited and its significance h as n ot b een e xtensively r eviewed i t his field. Hence the applicability of thermography laser medicine evaluated by corresponding essential parameters. This includes emissivity biological tissue, tissue phantoms cylindrical light diffusers used interstitial photodynamic therapy (iPDT).The time-dependent surface...

The temperature dependency (25°C – 50°C) of optical tissue properties was investigated on artificial and animal samples. An increase with found for all phantoms most