Melexis Nv · EURONEXT:MELE
Melexis Nv — Technical Presentation (2022)
28 slides from Melexis Nv's technical presentation, 2022
Slide 1: EMSA 22 Madrid
Slide 2: Syrine Mansour, Gael Close, Melexis, Switzerland
Syrine Mansour, Gael Close Melexis, Switzerland 2
Slide 3: Motivation, Device, Implementation
Motivation Device Implementation 3
Slide 4: Minimally Invasive Surgery (MIS)
Minimally Invasive Surgery (MIS) 4
Slide 5: Tactile sensing in MIS
Tactile sensing in MIS Capacitive: Change of electrical capacitance of the dielectric medium separating electrodes ● Needs humidity calibration [3] ● Sensitive to electromagnetic noise [3] CAD of a capacitive tactile sensor for MIS [1] Optical: Light transmission through an optical fiber to a detect
Slide 6: Device: Palpaxis
Device: Palpaxis Magnetic: Change in magnetic field detected by the Hall effect ● 3D detection ● Magnetic stray field immunity 6
Slide 7: Device: Palpaxis
Device: Palpaxis Palpaxis mounted on a Minimally Invasive Surgical instrument Palpation in Minimally Invasive Surgery 7
Slide 8: Device: Palpaxis
Device: Palpaxis ● Layer architecture ● Surface of 45[mm] x 25[mm] for 24 taxels ● Physical pitch 7.56 [mm] Architecture of Palpaxis, the tactile sensing surface 8
Slide 9: Design parameters
Design parameters [4] [4]: N. Dupré, Y. Bidaux, O. Dubrulle and G. F. Close, "A Stray-Field-Immune Magnetic Displacement Sensor With 1% Accuracy," in IEEE Sensors Journal, vol. 20, no. 19, pp. 11405-11411, 1 Oct.1, 2020, doi: 10.1109/JSEN.2020.2998289. 9
Slide 10: Prototyping
EMSA22 mfrn MADRID Prototyping Step 1 MOLD Tightly fixed with screws directly above the sensor Silicone casting directly on chips: better adherence aioces —, LAYOUT Array of 6 x 4 chips Vertical spacing: 3 [mm] Horizontal spacing; 1 [mm] CHIP SOLDERING Inspired from the human skin, texture of the ep
Slide 11: Prototyping
EMSA22 mfrn MADRID Prototyping Step 2 A) CAD drawing B) 3D printing C) Mold spraying with lubricant D) Silicone casting Fabrication protocol of the soft layer 11 G) Magnet insertion E) Silicone curing F) Extraction from mold
Slide 12: Working principle
EMSA22 mfrn MADRID Working principle ae ee Be sisi 12
Slide 13: Working principle
EMSA22 mfrn MADRID Working principle
Slide 14: Working principle
EMSA22 mfrn MADRID Working principle 14
Slide 15: Working principle
Working principle Mechanical rest under variant magnetic stray field Experimental setup for Bstray -> Sensor is stray field immune 15
Slide 16: Working principle
EMSA22 mfrn MADRID Working principle 16
Slide 17: Hardware optimization
Hardware optimization Dimensional constraint -> miniaturized version 17
Slide 18: Chip-on-board
Chip-on-board ● Strip of 31[mm] x 6.5[mm] for 16 taxels ● Physical pitch: 3.30[mm] ● Elongated shape to fit on a trocar ● Enhance spatial resolution ● Bare dies ● Flip chip assembly 18
Slide 19: Recapitulation of characteristics
Recapitulation of characteristics Parameter Value Resolution Weight of a peanut, around 0.3 [mN] Maximum sensed Normal Force 6 [N] Top layer High compliance Biocompatibility Weak tissue slippage 19
Slide 20: Thank you for your attention! Questions?
Thank you for your attention! Questions? 3 4 5 6 7 8 9 10 11 12 13 14 15
Slide 21: Appendix
EMSA22 mfrn MADRID Appendix
Slide 22: Experimental setup for indentation and force calibration
Experimental setup for indentation and force calibration 22
Slide 23: Helmholtz coils
EMSA22 mfrn MADRID Magnetic stray field Helmholtz coils SOURCE Natural: from non-man-made objects, e.g., the Earth's magnetic field Environmental: from nearby man-made objects (neighboring electronics) SF IMMUNITY ALGORITHM Differential measurement Relative variations of magnetic signal readout = >>
Slide 24: Experimental setup for stray field effect
Experimental setup for stray field effect 24
Slide 25: Stray field immunity
EMSA22 Stray field immunity Raw magnetic values [mT] to Bstray [mT] Raw magnetic values to astray wo woo a3 003 : as|— ao.2 a — sa02 — 50 Sxod.3 50 ta = as = as F g i 3 00 3 00 : a ia bas 30 -s0 4s 1s -190 7 3 2 a 0 T 2 3 100 . = q ? 3 stray lot] stray [ot] soo - Magnetic values im] post SI algorith
Slide 26: Data acquisition
EMSA22 mitra MADRID Data acquisition MelexlO Computer Vectors of magnetic values
Slide 27: Recapitulation of characteristics
Recapitulation of characteristics Parameter Value Number of taxels 16 taxels / 24 taxels (depending on hardware model) Physical pitch (center-to-center distance of chips) 3.30[mm] / 7.56[mm] Spatial resolution Lower than pitch: machine learning model Scan rate >= 100[ms] per acquisition Resolution W
Slide 28: Device: Palpaxis
Device: Palpaxis Surface of 45[mm] x 25[mm] for 24 taxels Physical pitch 7.56 [mm] Goal is to perform palpation in minimally invasive surgery Architecture of the device 28