Shark spiral intestines may operate as Tesla valves

Leigh, Samantha C.; Summers, Adam P.; Hoffmann, Sarah L.; German, Donovan P.

doi:10.1098/rspb.2021.1359

Cited by 21 publications

(8 citation statements)

References 46 publications

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“…Interestingly, the TV phenomenon has also been found in nature. The physical mechanism of the TV has been noted in the spiral intestine of sharks, skates, and rays where its natural design crucially reinforces nutrient absorption because of the higher friction between the dissolved meals and the spiral intestine walls [5,6]. This natural TV-like geometry in these species significantly provides greater surface area for the process of nutrient absorption and digestion.…”

Section: Of 23mentioning

confidence: 99%

Tesla Valve Microfluidics: The Rise of Forgotten Technology

Purwidyantri¹,

Prabowo²

2023

Preprint

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The Tesla valve (TV), a valvular conduit invented by Nicola Tesla over a decade ago, has recently gained significant attention and application in various fields due to the growing interest in microfluidics and nanofluidics. The unique architecture of TV characterized by an asymmetrical design and an arc-shaped channel, has long been an intriguing yet underrated design for building a passive component in a microfluidic system. While previously regarded as a technology without significant use, TV structures have been implemented in wearable devices, thermal manipulation fluidics, micromixers, micropumps, and fuel cell devices. This article presents the first comprehensive review of TV structures in the literature, which has seen significant growth in the last two years. The review discusses typical TV structures, including single-stage TV (STV), multistage TV (MSTV), and TV derivatives (TVD), along with their characteristics and potential applications. The designs of these structures vary based on their intended applications, but all are constructed based on the fundamental principle of the TV structure. Finally, future trends and potential applications of TV structures are summarized and discussed. This review provides a valuable reference for students, early-career scientists, and practitioners in the field of fluidic devices, particularly those interested in using TV structures as passive components.

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Section: Of 23mentioning

confidence: 99%

Tesla Valve Microfluidics: The Rise of Forgotten Technology

Purwidyantri¹,

Prabowo²

2023

Preprint

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“…Do active swimmers feel different resistances in the forward direction of the Tesla valve compared to the reverse direction? A better understanding of the diodicity of the Tesla valve for active swimmers, as well as the interaction of the Tesla valve with active matters in general, is expected to provide insight into understanding the function of certain biological structures, such as shark spiral intestines [15], and may pave a way to developing new applications of the Tesla valve in microbiological research and clinical settings [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Does Tesla valve work for microscale active swimmers? – a computational study

Rogers

Wang

2022

Preprint

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Although the Tesla valve is well-known for its diodicity for fluid flows and pressure drops, it is not clear whether and how the resistances experienced by active swimmers in the forward and reverse directions are different. Here we carried out a computational study on the diodicity of the Tesla valve for active swimmers in the absence of fluid flows. We simulated the active Brownian motion of the swimmers in a Tesla valve, followed by examining their trajectories and quantifying the fraction of active swimmers reaching the left or right end of the Tesla valve (in the forward or reverse direction, respectively). We also estimated the first passage time of the swimmers reaching the valve ends. We confirmed that, in the absence of fluid flows, the Tesla valve shows much higher resistance to active swimmers in the reverse direction than the forward direction. The current study provides a better understanding of the interaction of the Tesla valve with active swimmers and gives insight into potential applications of the Tesla valve in the filtering and sorting of motile microbes.

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“…1b). Leigh et al [9] suggested that shark spiral intestines may operate as Tesla valves, which may aid in effective absorption.…”

Section: Introductionmentioning

confidence: 99%

A new surgical technique for short bowel syndrome

Saeki

Kurihara

Kojima

et al. 2022

Preprint

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Objective Short bowel syndrome (SBS) is a severe intestinal disease that causes malabsorption, infection and liver failure. For the surgical management of intestinal rehabilitation, the intestinal loop lengthening method and serial transverse enteroplasty (STEP) method have been reported, although their effects have proven limited. We herein report a new surgical technique, Saeki – Spiral – Shark (3S) method for SBS using biomimetics of shark intestine. Methods In the 3S method, a spiral valve is formed inside the intestine by external sutures. Using a 25 cm length intestinal organ model, we performed both the 3S method and STEP procedure. We then compared the length and fluid passage times of the subsequently formed intestine. Results After the 3S method was performed, the length of the intestinal model changed to 22 cm, and after the STEP procedure, that was elongated to 30 cm. Although the water passage times did not change markedly, the semi-digestive nutritional supplement passage time slowed down in the model with the 3S method. There was slight leakage in the STEP procedure model. Conclusions The 3S method is a unique method of treating SBS based on biomimetics. This procedure does not require an incision of the intestine, which thereby enabling clean and less-invasive surgery. We plan to conduct animal experiments in the future.

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Shark spiral intestines may operate as Tesla valves

Cited by 21 publications

References 46 publications

Tesla Valve Microfluidics: The Rise of Forgotten Technology

Tesla Valve Microfluidics: The Rise of Forgotten Technology

Does Tesla valve work for microscale active swimmers? – a computational study

A new surgical technique for short bowel syndrome

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