Aerosol-Jet Printed Conformable Microfluidic Force Sensors

Jing, Qingshen; Pace, Alizée; Ives, Liam; Husmann, Anke; Ćatić, Nordin; Khanduja, Vikas; Cama, Jehangir; Kar‐Narayan, Sohini

doi:10.2139/ssrn.3732370

Cited by 2 publications

(7 citation statements)

References 35 publications

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“…The loading curves all show a similar sensitivity of 0.03 pF N -1 , but the unloading curves show large hysteresis. This hysteresis is only present when calibrating the sensors inside the curved trial insert geometryit is not present when the sensors are calibrated using the linear motor, when the sensors are flat 25 (see Supporting Information Fig. S2).…”

Section: Mechanical Testing Of Sensors Within Implant Geometry Validates Simulation Resultsmentioning

confidence: 99%

“…Fig. 1a is a schematic of the sensor, whose design is based on the group's previous work 25 . The sensor consists of (1) a microfluidic chip (Fig.…”

Section: Sensor Design and Operationmentioning

confidence: 99%

“…It has a square cross section, is filled with fluid by a syringe, and can contain internal columns for mechanical support. The fluid is a 2:1 volume mixture of glycerol and deionised (DI) water, to balance the low volatility and high dielectric constant 25 . The interdigitated electrodes are made by aerosol jet printing (AJP) silver nanoparticle ink onto Kapton and are protected by a printed PI layer.…”

Section: Sensor Design and Operationmentioning

confidence: 99%

“…The operating principle is as follows 25 : when a force is applied to the fluid reservoir, the reservoir deforms and displaces fluid along the channel. The displaced fluid overlaps with the interdigitated electrodes, increasing the capacitance.…”

Section: Sensor Design and Operationmentioning

confidence: 99%

“…The sensors are durable, with measurements reproduced over more than 2,000 loading cycles in a mechanical testing rig 25 . For each sensor, the force-capacitance relationship is calibrated by applying a known force and measuring the corresponding impedance using an impedance analyser (ISX-3, Sciospec), which is converted to a capacitance.…”

Section: Sensor Design and Operationmentioning

confidence: 99%

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Conformable and robust force sensors to enable precision joint replacement surgery

Ives

Pace

Bor

et al. 2021

Preprint

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Balancing forces within weight-bearing joints such as the hip during joint replacement surgeries is essential for implant longevity. Minimising implant failure is vital to improve patient wellbeing and alleviate pressure on healthcare systems. With improvements in surgery, hip replacement patients are now often younger and more active than in previous generations, and their implants correspondingly need to survive higher stresses. However, force balancing currently depends entirely on surgical skill: no sensors can provide quantitative force feedback within the hip joint’s small, complex geometry. Here, we solve this unmet clinical need by presenting a thin and conformable microfluidic force sensor, which is compatible with the standard surgical process. We optimised the design using finite element modelling, then incorporated and calibrated our sensor in a model hip implant. Using a bespoke testing rig, we demonstrated high sensitivity at typical forces experienced during hip replacements. We anticipate that these sensors will aid implant positioning, increasing the lifetime of hip replacements, and represent a powerful new surgical tool for a range of orthopaedic procedures where force balancing is crucial.

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Section: Mechanical Testing Of Sensors Within Implant Geometry Validates Simulation Resultsmentioning

confidence: 99%

“…Fig. 1a is a schematic of the sensor, whose design is based on the group's previous work 25 . The sensor consists of (1) a microfluidic chip (Fig.…”

Section: Sensor Design and Operationmentioning

confidence: 99%

Section: Sensor Design and Operationmentioning

confidence: 99%

Section: Sensor Design and Operationmentioning

confidence: 99%

Section: Sensor Design and Operationmentioning

confidence: 99%

See 3 more Smart Citations

Conformable and robust force sensors to enable precision joint replacement surgery

Ives

Pace

Bor

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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3D Printing of Robotic Soft Grippers: Toward Smart Actuation and Sensing

Goh

Lyu

Ariffin

et al. 2022

Adv Materials Technologies

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Unlike traditional hard grippers, soft robotic grippers are commonly made of soft materials so that the soft grippers can produce motion via elastic deformations of their compliant components. The advantages of compliance allow soft grippers to effectively eliminate shocks caused by hard contact, which usually occurs when a hard robotic gripper manipulates a hard object. Until now, the soft robotic grippers are able to operate numerous objects with irregular geometries and different textures. Besides, with the help of embedded sensors, soft robotic grippers have facilitated the growing automation of many tasks, which are thought to be far too delicate for robotic manipulation. This paper reviews the advancement in soft robotic grippers. The paper first introduces the actuation technologies followed by the design and fabrication techniques. The use of 3D printing techniques in the fabrication of the soft gripper is also discussed. The Review then highlights the challenges and future outlook in the fabrication of soft grippers and sensors.

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Aerosol-Jet Printed Conformable Microfluidic Force Sensors

Cited by 2 publications

References 35 publications

Conformable and robust force sensors to enable precision joint replacement surgery

Conformable and robust force sensors to enable precision joint replacement surgery

3D Printing of Robotic Soft Grippers: Toward Smart Actuation and Sensing

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