PVDF-Based Microfabricated Tactile Sensor for Minimally Invasive Surgery

Qasaimeh, Mohammad A.; Sokhanvar, Saeed; Dargahi, Javad; Kahrizi, Mojtaba

doi:10.1109/jmems.2008.2008559

Cited by 120 publications

(67 citation statements)

References 30 publications

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“…In order to take advantage of its high flexibility, polyvinylidene fluoride (PVDF) is one of the most commonly used sensitive piezoelectric polymers [19][20][21][22]. Typical polymeric piezoelectric tactile sensors consist of a single PVDF layer with multiple electrodes.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of silicone embedded distributed piezoelectric sensors for contact detection

Acer

Salerno

Agbeviade

et al. 2015

Smart Mater. Struct.

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Tactile sensing transfers complex interactive information in a most intuitive sense. Such a populated set of data from the environment and human interactions necessitates various degrees of information from both modular and distributed areas. A sensor design that could provide such types of feedback becomes challenging when the target component has a nonuniform, agile, high resolution, and soft surface. This paper presents an innovative methodology for the manufacture of novel soft sensors that have a high resolution sensing array due to the sensitivity of ceramic piezoelectric (PZT) elements, while uncommonly matched with the high stretchability of the soft substrate and electrode design. Further, they have a low profile and their transfer function is easy to tune by changing the material and thickness of the soft substrate in which the PZTs are embedded. In this manuscript, we present experimental results of the soft sensor prototypes: PZTs arranged in a four by two array form, measuring 1.5-2.3 mm in thickness, with the sensitivity in the range of 0.07-0.12 of the normalized signal change per unit force. We have conducted extensive tests under dynamic loading conditions that include impact, step and cyclic. The presented prototype's mechanical and functional capacities are promising for applications in biomedical systems where soft, wearable and high precision sensors are needed.

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Section: Introductionmentioning

confidence: 99%

Development and characterization of silicone embedded distributed piezoelectric sensors for contact detection

Acer

Salerno

Agbeviade

et al. 2015

Smart Mater. Struct.

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“…A variety of touch/pressure sensing techniques use a spatial grid of capacitive, 23 piezoresistive, 3 or piezoelectric polymer 45 sensors capable of discerning the location and magnitude of an indentation force/pressure. However, recent advances in soft sensing have provided yet another option for distributed sensing.…”

Section: Engineering and Manufacturing Of The Pressure-sensing Skinmentioning

confidence: 99%

Novel pressure-sensing skin for detecting impending tissue damage during neuroendoscopy

Codd¹,

Arabagi

Gosline

et al. 2014

PED

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Object Endoscopy plays an increasingly important role in minimally invasive neurosurgery. Visual feedback from the endoscope tip helps the surgeon prevent unwanted tissue contact. However, critical feedback regarding tissue deformation and trauma from proximal endoscope components is currently unavailable. A system for force feedback along the endoscope length could provide significant clinical benefit by warning of impending damage. The authors manufactured and tested a novel pressure-sensing polymer skin for use in pressure feedback during intracranial endoscopy. Methods A photolithography process on a silicon wafer was used to produce a pattern of 80-μm-tall extrusions to serve as a positive mold for the sensor array. A thin layer of polydimethylsiloxane polymer was molded onto these features. Demolding the polymer from the wafer and sealing with another polymer layer resulted in microchannels. These microchannels were filled with a conductive liquid metal and connected to recording hardware. Spiral channel patterns were designed to create a 3 × 3 array of pressure-sensor pads, which were wrapped around a standard neuroendoscope operating sheath. Pressure readings from the compressed sensor array were translated into a color-coded graphic user interface. Calibration experiments were conducted, and the sensor was evaluated through cortical compression tests on explanted ovine brain. Results The sensing endoscope operating sheath was successfully calibrated to detect and display pressures within a range consistent with normal and tissue-threatening compressions. Conclusions Force-feedback mechanisms for the neuroendoscopist are critically lacking with contemporary endoscopes. The authors designed a pressure-sensing skin technology for improved pressure feedback during endoscopy as a means for minimizing collateral tissue damage during endoscopy.

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“…and Materials Engineering (26) The characteristics of each material are shown in Tables 1 and 2. We used the characteristics of PVDF for ν P (7) . The Young's modulus of the VDF oligomer (Y p ) was determined from the results of the nanoindentation tests described in §2.2.2.…”

Section: Simulationmentioning

confidence: 99%

Measurement of the Piezoelectric Properties of Vinylidene Fluoride Oligomer Using Pneumatic Pressure for Tactile Sensors

Takashima

Horie

Takenaka

et al. 2012

JMMP

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Vinylidene fluoride [VDF] oligomer is a novel substance with a smaller number of VDF units and lower molecular weight than poly(vinylidene fluoride) [PVDF]. We previously reported that the piezoelectric coefficient of VDF oligomer was greater than that of vinylidene fluoride/trifluoroethylene copolymer [P(VDF/TrFE)], and that a film composed of VDF oligomer was thin and uniform. However, the piezoelectric coefficients measured with our experimental setup using pneumatic pressure were very large. In the present study, we investigated the effects of the pyroelectricity and the substrate constraints on the piezoelectric effects of VDF oligomer by means of both experimental analyses and mathematical simulations. First, we showed that the output charge of the pyroelectric effect is large, according to our measurements. Second, we showed using the finite element method that the piezoelectric effects in the thickness direction of the film are weakened when the film is constrained by the substrate. We then estimated the piezoelectric coefficient of VDF oligomer and P(VDF/TrFE). The estimated value for P(VDF/TrFE) is similar to that reported in other previous studies.

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PVDF-Based Microfabricated Tactile Sensor for Minimally Invasive Surgery

Cited by 120 publications

References 30 publications

Development and characterization of silicone embedded distributed piezoelectric sensors for contact detection

Development and characterization of silicone embedded distributed piezoelectric sensors for contact detection

Novel pressure-sensing skin for detecting impending tissue damage during neuroendoscopy

Measurement of the Piezoelectric Properties of Vinylidene Fluoride Oligomer Using Pneumatic Pressure for Tactile Sensors

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