Mr. Konstantin L. Borissov Profile

Konstantin L. Borissov

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Proceedings Article | 28 April 2023 Poster

The use of nylon actuators within an active textile for applications in compression therapies

Sukhneet Dhillon, Ying Li, Adriana Cowan, Magan Chang, Tony Huang, Konstantin Borissov, John Madden

Proceedings Volume PC12482, PC124820P (2023) https://doi.org/10.1117/12.2667947

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Nylon actuators yield a large reversible strain (5-20%+), are compact (300-µm) and provide a low-cost option for biomedical applications. We propose to develop an active textile composed of cotton, silver-coated nylon, and nylon actuators. We will assess the feasibility of nylon actuators to generate effective cycle rates and compression pressures similar to those of clinically effective pneumatic compression pumps. Our aim is to establish correlations between three nylon actuator configurations (parallel, parallel at 30°, and crisscrossed at 30°), thermal distribution, and compression pressure, as well as between power input and nylon actuator cycle rate. A microcontroller unit (MCU) and a pressure sensor will be developed for the nylon actuators to ensure that the actuators are under constant strain, while monitoring pressure, current, voltage and temperature. The development of an actively contracting textile could have significant benefits for portable compression therapies.

Proceedings Article | 22 March 2021 Presentation + Paper

Supercoiled polymer-actuated pinch valve

Konstantin Borissov, Henry Tran, John D. Madden

Proceedings Volume 11587, 115870N (2021) https://doi.org/10.1117/12.2584495

KEYWORDS: Polymers, Actuators, Systems modeling, Silver, Polymeric actuators, Latex, Control systems, Artificial muscles

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Supercoiled polymer (SCP) actuators have shown promising applicability as artificial muscles due to their low-cost, high strains (10%+), work density that is more than 100 x that of muscle, and non-hysteretic behavior. Here, we present a lightweight, low-cost, SCP-actuated valve that operates by pinching rubber tubing closed. The valve comprises a 3D printable frame and incorporates a pulley system, which functions to reduce the total linear dimensions of the device. The actuator mechanism is compatible with different tubing diameters and materials and, by nature of its design, is isolated from direct contact with the working fluid. Using 1/4”/6.3 mm inside diameter latex tubing, a flow rate of up to 88 L/h and a holding pressure of over 29.4 kPa are demonstrated. The valve is normally open and takes 10 seconds to close by running a current through the coiled, silver-coated nylon actuator. An empirical model of the system is developed and open-loop control incorporated, which effectively reduced valve activation time by 30%. Further developments are suggested to achieve a faster response and pumping action.

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