Tobias Pilic

Pulsed Ultrasound Approach for the Measuring of
Tension and Compression at Nerve Fibre Structures in
Surgical Training Simulators
Tobias Pilic
Our Institute
•
Professorship: Prof. Dr. Werner Korb
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15 scientists
•
3 doctors
www.istt.htwk-leipzig.de/en/
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
2
Sensory in Surgical Simulation Systems
PHYSIOLOGICAL MODEL
PASSIVE ELEMENTS
BONE STRUCTURES
SOFT TISSUE
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
3
Sensory in Surgical Simulation Systems
PHYSIOLOGICAL MODEL
ACTIVE ELEMENTS
PASSIVE ELEMENTS
BLEEDING
BONE STRUCTURES
MOVEMENT
SOFT TISSUE
REALISM
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
4
Sensory in Surgical Simulation Systems
PHYSIOLOGICAL MODEL
ACTIVE ELEMENTS
PASSIVE ELEMENTS
SENSORY
INVISIBLE ELEMENTS
BLEEDING
BONE STRUCTURES
TRACKING
MOVEMENT
SOFT TISSUE
FORCE MEASUREMENT
FEEDBACK
REALISM
SCENARIO-BASED TRAINING
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
5
Metrological Problem
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
6
Solution (1)
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
7
Solution (2)
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
8
How does it work?
HTWK Leipzig
University of Applied Sciences
•
Highly attenuating and varying
transmission behaviour
•
Software algorithm adjusts
Transmitter-Power and ReceiverGain
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Zero signal with predefined
characteristics
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Changes of the signals
characteristics as measure of
tension and compression
Tobias Pilic | Nextmed / MMVR 21
9
How does it work? Compression
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Energy variation as a measure
of compression
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Parameter D as ratio between
the signal with compression and
without compression
𝒇(𝑽𝟏 )
𝑬𝟏
𝑫=
=
𝒇(𝑽𝟎 )
𝑬𝟎
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
10
How does it work? Tension
•
Change in signal propagation
delay Δ𝒕 as a measure of tension
•
Calculation of the change in
length Δ𝒍 :
Δ𝒍 = 𝒄𝒍 ( Δ𝒕 )
𝒄𝒍 → Ultrasound speed
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
11
Measurand generation
Transmission
Behaviour
F
HTWK Leipzig
University of Applied Sciences
H1(...)
Adjustment
ΔA
Δl
T
Hardware
Calibration
D
Δl
Tobias Pilic | Nextmed / MMVR 21
H2(...)
F
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Progress and Results
•
Proof of concept
•
Tracking of the trainees
interactions through control
room, head surgeon reacts
through active elements
•
Development focussing on:
 More versatile system
 Reproduceability
 Cost-effeciency
RealSpine plus
HTWK Leipzig
University of Applied Sciences
•
Commercialisation
•
Patent application
Tobias Pilic | Nextmed / MMVR 21
13
Progress and Results
RealSpine
•
Proof of concept
•
Tracking of the trainees
interactions through control
room, head surgeon reacts
through active elements
•
Development focussing on:
 More versatile system
 Reproduceability
 Cost-effeciency
RealSpine plus
HTWK Leipzig
University of Applied Sciences
•
Commercialisation
•
Patent application
Tobias Pilic | Nextmed / MMVR 21
14
Progress and Results
•
Proof of concept
•
Tracking of the trainees
interactions through control
room, head surgeon reacts
through active elements
•
Development focussing on:
 More versatile system
 Reproduceability
 Cost-effeciency
RealSpine plus
HTWK Leipzig
University of Applied Sciences
•
Commercialisation
•
Patent application
Tobias Pilic | Nextmed / MMVR 21
15
Progress and Results
•
Proof of concept
•
Tracking of the trainees
interactions through control
room, head surgeon reacts
through active elements
•
Development focussing on:
 More versatile system
 Reproduceability
 Cost-effeciency
RealSpine plus
HTWK Leipzig
University of Applied Sciences
•
Commercialisation
•
Patent application
Tobias Pilic | Nextmed / MMVR 21
16
Discussion and Future Work
Short-term Vision: All-purpose force measurement system for surgical training
simulators
• Tracking and automation of sequences
( Scenario-based Training )
• More realistic training: Simulation of complications
• Clinical trials: acquisition of force profils
( Experienced surgeon  Trainee )
Long-term Vision: In vivo force Measurement
• Objective data regarding complications and there origin
• Living tissue characterisation ( Elasticity … )
 Haptics research for a haptic defined field!
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
17
Realspine
REALISTIC ANATOMY
INTEROPERATIVE
BLEEDING
REAL INSTRUMENTS
MODULAR SYSTEM
AS EASY AS 1-2-3
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
18
Realspine (2)
Interlaminar Approach:
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | Nextmed / MMVR 21
•
Flavectomy
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Laminectomy
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Foraminotomy
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Facetectomy
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Removal of lumbar disc
herniation
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Discectomy
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Preperation of interbody
endplates
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TLIF via interlaminar
application
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Dura suture
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Duraplasty
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[peshkova - Fotolia.com]
HTWK Leipzig
University of Applied Sciences
Tobias Pilic | pilic@istt.htwk-leipzig.de
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