Cavitation Bubble Dynamics and Acoustic Transient Generation in Ocular Surgery with Pulsed Neodymium:YAG Lasers

Vogel, Alfred; Hentschel, W.; Holzfuss, Joachim; Lauterborn, Werner

doi:10.1016/s0161-6420(86)33576-0

Cited by 147 publications

(73 citation statements)

References 19 publications

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“…The induction of cavitation bubbles in the medical field using more advanced methods has been described earlier for ocular surgery with the neodymium YAG laser [23] and can be suspected for procedures such as extracorporeal shock wave lithotripsy of gall and kidney stones. High-speed photography and holography have been used in cavitation research by Lauterborn et al [21,22].…”

Section: Discussionmentioning

confidence: 99%

High‐speed rotational angioplasty‐induced echo contrast in vivo and in vitro optical analysis

Zotz

Erbel

Philipp

et al. 1992

Cathet. Cardiovasc. Diagn.

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High-speed rotational angioplasty is being evaluated as an alternative interventional device for the endovascular treatment of chronic coronary occlusions. It has been postulated that this type of angioplasty device may produce particulate debris or cavitations that induce myocardial ischemia. To determine the clinical presence of myocardial ischemia during rotational angioplasty, echocardiographic monitoring for wall motion abnormalities was performed in 9 patients undergoing rotational atheroablation using the Auth Rotablator for 10-sec intervals at 150,000 and 170,000 rpm. No wall motion abnormalities were detected in 5 patients evaluated with transesophageal echocardiography or in 4 patients monitored transthoracically, although AV block developed in one patient. Video intensitometry of the myocardial contrast effect for rotation times ranging from 3 to 20 sec found transient contrast enhancement of the myocardium supplied by the treated vessel. Intensity varied over time with half-time decay between 5.6 and 40 sec, indicating the likelihood of microcavitation. An in vitro model was constructed to measure the cavitation potential of the Auth Rotablator. A burr of 1.25 mm diameter rotating at 160,000 rpm achieves a velocity in excess of the 14.7 m/sec critical cavitation velocity. Testing the device in fresh human blood and distilled water produced microcavitations responsible for the enhanced echo effect, with the intensity and longevity of cavitation more pronounced in blood and proportional to the rotation time and speed. The mean size of the microcavitation bubbles in water was 90 +/- 33 (52-145) microns measured from photographs taken with a copper vapour laser emitting light pulses of 50 nsec duration as light source. The mean velocity of bubbles was found to be 0.62 +/- 0.30 ranging from 0.23 to 1.04 m/sec. It was measured via the motion of the bubbles during 5 laser pulses within 800 nsec. Clearly, microcavitations are associated with enhanced myocardial echo contrast effect.

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Section: Discussionmentioning

confidence: 99%

High‐speed rotational angioplasty‐induced echo contrast in vivo and in vitro optical analysis

Zotz

Erbel

Philipp

et al. 1992

Cathet. Cardiovasc. Diagn.

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“…The approximate validity of relation (2.5) and of the Rayleigh collapse time (2.4) has been shown for millimetre-sized laser-induced bubbles in bulk water (Lauterborn 1974). Relation (2.5) together with (2.4) allows for a precise determination of R max with just a hydrophone (Hentschel & Lauterborn 1982;Vogel et al 1986;Vogel & Lauterborn 1988;Venugopalan et al 2002;Hutson & Ma 2007), without the need for high-speed photography, through the determination of T osc from the shock waves emitted at generation (time t g ) and at collapse (time t c ). Alternatively, T osc can be determined by detecting the deflection of a probe laser beam (Vogel et al 2008).…”

Section: B Han and Othersmentioning

confidence: 99%

Dynamics of laser-induced bubble pairs

et al. 2015

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The interaction of two laser-induced bubbles in bulk water is investigated. The strength and direction of the emerging liquid jets can be controlled by adjusting the relative bubble positions, the time difference between bubble generation, and the laser pulse energies determining the bubble sizes. Experimental and numerical studies are performed for millimetre-sized bubble pairs. Taking bubbles of equal energy, a maximum jet velocity is found for close anti-phase bubbles, i.e. when the second bubble is produced at the maximum volume of the first one and the bubble walls are almost touching and not merging. Under these conditions, one bubble produces a fast jet with a peak velocity of about 150 m s −1 that reaches a distance into the surrounding liquid of at least three times the maximum bubble radius. Collapse of the other bubble results in a slow jet of large mass that rapidly converts into a ring vortex. Correspondingly, the interaction with adjacent structures is dominated either by localized jet impact or by shear stresses extending over a larger area. Furthermore, interactions between micrometre-sized bubble pairs are investigated numerically to understand and predict how the effects of the physical parameters on bubble dynamics would change when the bubbles become smaller. The results are discussed with respect to micropumping and opto-injection.

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“…This is sup ported by the presence of the gradients of pressure that act from the solid-liquid to air and from hot to cold. The assumption of the presence of pressure gradients is supported by cavitation bubbles [5]. In view of the useful excretion process, it would not be useful to impede it by placing an obstructing probe into the lumen of the trough.…”

Section: Discussionmentioning

confidence: 99%