Towards implementation of hollow core fibres for surgical applications

Urich, Artur; Delmonte, T.; Maier, Robert R. J.; Hand, Duncan Paul; Shephard, Jonathan D.

doi:10.1117/12.876109

Cited by 6 publications

(9 citation statements)

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“…The “measuring” fiber used was a previously reported HC-PCF with a band gap at 2.94 µm, core diameter of 24 µm and a single mode core profile [15]. This measurement, using a smaller-core fiber for signal collection, significantly increase the fidelity of the convolution which was present in the earlier similar measurement [14] using two identical fibers.…”

Section: Fibermentioning

confidence: 99%

“…However for a medical device a polyimide jacket can be used, which withstands much higher temperatures. The endtip was not tested in the autoclave, however previous tests [15] have shown that the bond between the sapphire tube and sapphire rod is hermetically sealed and stable to temperatures over 1000°C.…”

Section: Tissue Ablationmentioning

confidence: 99%

“…) [9]. However, as light is mainly confined to the hollow core the influence of this high absorption is significantly reduced allowing low-loss fibers to be made in this wavelength region [10,15]. Silica is a desirable material for medical applications as it has several advantages, e.g., it can withstand high temperatures, it is bio-inert, mechanically and chemically robust and it has been extensively characterized for fiber drawing which makes it easy to handle.…”

Section: Introductionmentioning

confidence: 99%

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Flexible delivery of Er:YAG radiation at 294 µm with negative curvature silica glass fibers: a new solution for minimally invasive surgical procedures

Urich

Maier

et al. 2012

Biomed. Opt. Express

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We present the delivery of high energy microsecond pulses through a hollow-core negative-curvature fiber at 2.94 µm. The energy densities delivered far exceed those required for biological tissue manipulation and are of the order of 2300 J/cm2. Tissue ablation was demonstrated on hard and soft tissue in dry and aqueous conditions with no detrimental effects to the fiber or catastrophic damage to the end facets. The energy is guided in a well confined single mode allowing for a small and controllable focused spot delivered flexibly to the point of operation. Hence, a mechanically and chemically robust alternative to the existing Er:YAG delivery systems is proposed which paves the way for new routes for minimally invasive surgical laser procedures.

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Section: Fibermentioning

confidence: 99%

Section: Tissue Ablationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexible delivery of Er:YAG radiation at 294 µm with negative curvature silica glass fibers: a new solution for minimally invasive surgical procedures

Urich

Maier

et al. 2012

Biomed. Opt. Express

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“…To demonstrate that tissue ablation is possible with this system a porcine bone was used. The fibre was sealed with a sapphire tip as was reported in [19], to protect the fibre core from debris and other contaminations. Successful cutting/drilling of the bone was performed using the fibre in contact and non-contact mode in air and under water.…”

Section: Resultsmentioning

confidence: 99%

Silica hollow core microstructured fibres for mid-infrared surgical applications

Urich¹,

Maier²,

Yu³

et al. 2013

Journal of Non-Crystalline Solids

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In this paper two silica hollow core microstructured fibres (Negative Curvature Fibre and Photonic Crystal Fibre) are presented with attenuations of 1.1dB/m and 0.06dB/m at 2.94µm wavelength, respectively. This is an important regime for medical applications, specifically surgery due to the existence of a strong absorption peak for water around 3µm. The guidance of high energy pulses in the order of 195mJ and 14.4 mJ respectively has been demonstrated. These energies are sufficient to ablate soft and hard biological tissue. As verification porcine bone was ablated in air and submerged in a water to simulate practical application of a surgical device. These fibres open the way to a new and fully flexible delivery system for high energy Er:YAG laser radiation.

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“…A demonstration of tissue ablation was done using porcine bone. The fibre was sealed by a sapphire endtip, as was reported in [19]. This is necessary to protect the fibre from debris and liquids the tests were carried out in air and with the fibre submerged in water.…”

Section: High Energy Delivery and Tissue Ablationmentioning

confidence: 99%

Flexible delivery of Er:YAG radiation at 2.94 μm with novel hollow-core silica glass fibres: demonstration of tissue ablation

Urich¹,

Maier²,

Knight

et al. 2013

SPIE Proceedings

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In this work we present the delivery of high energy Er:YAG laser pulses operating at 2.94 m through a hollow-core negative curvature fibre (HC-NCF) and a hollow-core photonic crystal fibre (HC-PCF) and their use for the ablation of biological tissue. In HC-NCF fibres, which have been developed recently, the laser radiation is confined in a hollow core and by an anti-resonant or reflection principle (also known as ARROW). Both fibres are made of fused silica which has high mechanical and chemical durability, is bio-inert and results in a fibre with the flexibility that lends itself to easy handling and minimally invasive procedures. The HC-NCF structure consists of only one ring of capillaries around a realtively large core, followed by a protecting outer layer, hence the preform is relatively easy to build compared to traditional HC-PCF. The measured attenuation at 2.94 µm is 0.06 dB/m for the HC-NCF and 1.2 dB/m for the HC-PCF. Both fibres have a single mode output beam profile which can be advantageous for surgical applications as the beam profile is maintained during fibre movement. We demonstrate delivery of high energy pulses through both fibres, well above the thresholds needed for the ablation of biological tissue in non-contact and contact mode. Delivered energy densities reached > 750 J/cm -2 after 10 m of HC-NCF and > 3400 J/cm 2 through a 44 cm HC-PCF.This flexible high energy delivery system offers an alternative to existing beam delivery systems such as articulated arms and large core multi-mode fibres with enhanced capabilities.

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Towards implementation of hollow core fibres for surgical applications

Cited by 6 publications

References 0 publications

Flexible delivery of Er:YAG radiation at 294 µm with negative curvature silica glass fibers: a new solution for minimally invasive surgical procedures

Flexible delivery of Er:YAG radiation at 294 µm with negative curvature silica glass fibers: a new solution for minimally invasive surgical procedures

Silica hollow core microstructured fibres for mid-infrared surgical applications

Flexible delivery of Er:YAG radiation at 2.94 μm with novel hollow-core silica glass fibres: demonstration of tissue ablation

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