Optical fibre delivery systems for laser angioplasty and laser treatment of tumours

Russo, V.

doi:10.1007/bf02593813

Cited by 5 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By tuning the etching time, we have shown that an appropriate fiber tip could be made to control the beam profile from flat to donut which is often required for some medical applications [37][38][39]. We have applied this beam flattening technique for nerve stimulation [41].…”

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 96%

“…The LPG and multimode interference based techniques do not meet the high power delivery requirements. Compared to currently-used modified tips [37][38][39], concave tip fibers have several advantages such as precise control of beam size, high transmission efficiency, uniform intensity distribution, and low cost of fabrication process. In some practical applications, a flat beam might be needed at a given distance from the fiber end face.…”

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

“…There are several methods to deliver a donut beam directly from the fiber to the surface such as integrated optical fiber with scattering tips or micro-lenses [37][38][39], all-fiber LPG [10] and multimode interference devices [40]. The LPG and multimode interference based techniques do not meet the high power delivery requirements.…”

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

“…Donut shape intensity distribution is particularly useful for medical application for treatment of the interior of hollow body organs [37][38][39]. There are several methods to deliver a donut beam directly from the fiber to the surface such as integrated optical fiber with scattering tips or micro-lenses [37][38][39], all-fiber LPG [10] and multimode interference devices [40].…”

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

See 3 more Smart Citations

Laser beam shaping and mode conversion in optical fibers

Mayeh

Farahi

2011

Photonic Sens

View full text Add to dashboard Cite

A new class of all-fiber beam shaping devices has been realized by inverse etching the end face of single mode and multimode fibers to form a concave cone tip. Concave tip fiber can convert a Gaussian beam profile to a flat top beam profile with a uniform intensity distribution. A flat top beam with intensity variation of approx. 5% and flat top diameter to spot diameter ratio of 67% has been achieved. This device can also change the beam shape from a Gaussian to a donut by moving the observation plane. A flat top multimode fiber beam delivery is attractive for applications which require high power and uniform intensity distribution. In single mode fiber, concave tips could be used to reduce the beam spot size diameter, enabling efficient light coupling from a single mode fiber to an integrated optical waveguide.

show abstract

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 96%

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

Section: Beam Shaping Using Concave Tip Multimode Fibermentioning

confidence: 99%

See 2 more Smart Citations

Laser beam shaping and mode conversion in optical fibers

Mayeh

Farahi

2011

Photonic Sens

View full text Add to dashboard Cite

show abstract

“…They can transmit laser rays at distances required in medicine with little power loss (Russo, 1988). In order to select suitable light fibre for transmission of light energy, it is necessary to consider the size of the fibre and the material it is made of in the first place.…”

Section: Introductionmentioning

confidence: 99%

Transmission of Ultrasonic Waves Via Optical Silica Glass Fiber Doped by 7.5% of TiO2 with the Use of Power Sandwich Transducer

Muc¹,

Gudra²

2011

Archives of Acoustics

View full text Add to dashboard Cite

The possibility of acoustic wave propagation in optical waveguides creates new prospects for simultaneous transmission of laser beams and ultrasonic waves. Combined laser-ultrasonic technology could be useful in e.g. surgical treatment. The article presents the results of experimental studies of transmission of ultrasonic wave in optical fibres, the core of which is doped by 7.5% of TiO 2 , using a sandwichtype transducer. It also presents amplitude characteristics of an ultrasonic signal propagated in the optical fibre. Authors studied the effect which the length of the fibre has on the achieved output signal amplitudes. They presented the relation of the output signal amplitude from a capacitive sensor to the power applied to the sandwich-type transducer. The obtained results were compared with the results produced when using an optical fibre with a core doped by 3% of GeO 2 , in order to select optical fibre suitable for simultaneous transmission of ultrasonic waves and laser rays.Keywords: ultrasounds, transmission of acoustic wave in an optical waveguide.

show abstract

Evaluation of a prototype steerable angioscopic laser catheter in a canine model: A feasibility study

Froelich

Barth

Lossef

et al. 1993

Cardiovasc Intervent Radiol

View full text Add to dashboard Cite

To overcome some of the persisting technical problems related to laser angioplasty, a new catheter was designed and investigated in a canine model. This 5F catheter contained a deflectable tip for steerability, an angioscope, and a laser fiber. Catheter steerability, angioscopic function, and the effects of a 480 nm flash lamp pumped pulsed dye laser on normal canine vessel walls were evaluated. Steering, angioscopic guidance, and application of laser energy were easy and fast to perform in a bloodless vessel segment. Maintaining a condition of bloodlessness at the target site, critical to angioscopic guidance, proved to be the most difficult part in this prototype evaluation. It was noted that the 480 nm pulsed dye laser did not cause macroscopic alterations or perforations to the normal vessel wall. We conclude that a relatively simple deflection mechanism of a small-caliber angioscope provides the kind of aiming ability requisite for precise endovascular therapy. Complete bloodlessness of the area is necessary for both viewing and laser ablation at 480 nm.

show abstract

Optical fibre delivery systems for laser angioplasty and laser treatment of tumours

Cited by 5 publications

References 10 publications

Laser beam shaping and mode conversion in optical fibers

Laser beam shaping and mode conversion in optical fibers

Transmission of Ultrasonic Waves Via Optical Silica Glass Fiber Doped by 7.5% of TiO2 with the Use of Power Sandwich Transducer

Evaluation of a prototype steerable angioscopic laser catheter in a canine model: A feasibility study

Contact Info

Product

Resources

About