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Institute for SurgicalTechnology & Biomechanics
Annual Report2013
40
Mechanical Design and ProductionUrs Rohrer, Head of Mechanical Design and ProductionEmail: [email protected]; phone: +41 31 631 5935
Urs Patrick Ronald LukasRohrer Moser Ramseier Rufener
Group ProfileThe primary function of the Mechanical Design and Pro-duction (MDP) group is the co-development and manufac-turing of mechanical and electro-mechanical components related to the research pursuits of the ISTB and ARTORG. The MDP group supports all levels of the design and manufacturing process from concept to production. This includes computer assisted design (CAD) modelling, pro-totyping and production with technical drawings, stand-ard tooling, computer assisted manufacturing (CAM), a CNC-milling-machine and a CNC-lathe. We also support industrial and academic external research collaborators with their mechanical design and production needs.
Training and EducationThe MDP group has a secondary role in training. This training encompasses the skills required to safely and
the knowledge required to achieve the best results with
-prenticeships are used as a means to evaluate candidates for a full apprenticeship in the MDP group. This year, we performed one course and we selected Julien Meister as our next apprentice; he will begin his training in August of 2014 as a polymechanic apprentice.
Research Equipment Design and Manufacturing (ISTB)As expected, the requirements of a machine shop sup-
researched in the ISTB yield a number of diverse design and production requests from prototype clinical and
kinematic testing, as well as imaging system accessories and calibration equipment. The following illustrations
Extensometer Clamp and Indent Testing DeviceThe musculoskeletal biomechanics group required several different devices for a number of force and bone indent tests. The design and manufacture of these devices was supported by the MDP group. After manufacturing, the indent device was tested on the Synchrotron Radiation Micro-Computer Tomography machine in Grenoble.During experiments on the materials testing machine it
the extensometer onto the thin bone samples. Subse-quently, we have constructed a guide unit in collaboration with the musculoskeletal biomechanics group.
Improved Acrylic Calibration PhantomIn previous years we have developed a large, universally applicable, calibration phantom for the IPMI group. Based on the measurement results with the large phantom we could now produce a phantom made of acrylic glass of a size which can be used directly on the patient.
Periacetabular Osteotomy Chisel CalibrationIn 2010 the MDP group developed a PAO chisel, capable of being navigated, for the Orthopedic Department at the
we have designed an attachment for a new multi-calibra-tion tool and constructed a prototype.
Custom extensometer clamp, constructed to ensure accu-rate fixation to thin bone samples.
Acrylic calibration phantom.
Navigated PAO chisel with calibration device.
41
Research Equipment Design and Manufacturing(ARTORG)The workshop at the ARTORG Center is managed by Ronald Ramseier, a former polymechanic in the ISTB MDP-group. This year the machine shop at the ARTORG Center
Computational Bioengineering Groups, including design and manufacturing.As the ARTORG workshop pursues many of the same aims as the MDP group at the ISTB, and as much of the production equipment is located at the MDP. The partner-ship between the two groups was further consolidated this year, and is still growing. Some highlights of this
Spine Hexapod-
engineering Group at the ISTB and the ARTORG Center
to the motor, leading to less power loss and vibration during operation than was observed in the initial version. Additionally, a new coupling and quick-release system was developed.
Endoscope Calibration ToolWith the integration of endoscopic imaging into the existing surgical navigation system of the ARTORG Center and CAScination AG, a simple and robust method of endoscope calibration was required. In order to achieve this aim, a calibration device, in the form of a stapes, was designed and manufactured.
Titanium High Accuracy Tracking MarkersThe new patient and tool reference trackers for the high-precision robotic system of the IGT group were, for
This has a number of advantages; the new markers are light as aluminum but much more dimensionally stable. Surface treatment of the markers enhances the robust-ness and longevity of the tool while reducing the effects
angle is enabled through the use of a countersunk illumi-nation mask.
An endoscope calibration device was developed for mini-mally invasive surgery.
Hexapod robot for measurement of forces on the spine. A new prototype was developed with less power loss and vibration.
High accuracy tracking markers, constructed from titanium, allow measurement and control of a robotic system for minimally invasive cochlear implantation.
Annual Report 2012Institute for Surgical Technology and BiomechanicsARTORG Center for Biomedical Engineering Research
Compu-tational Bio-engineering
Medical Image Analysis
Information Processing in Medical Inter-
ventions
Lung Regeneration Technologies
Musculoskeletal Biomechanics
Tissue & Organ
Mechano-biology
Artificial Kidney
Research
Diabetes Technology Research
Geron-technology
and Rehabili-tation
Cardiovascular Engineering
Artificial Hearing Research
Image GuidedTherapy
Ophthalmic Technology
5Annual Report 2012
BIOMEDICAL EnGInEERInG REsEARCH
AT THE UnIVERsITy Of BERn AnD THE InsELsPITAL
The University of Bern and Bern University Hospitalhost a variety of research groups concerned with
specialized topics within the field of biomedicalengineering. This page provides a selection
of some of the currently active groups.
Advanced Neuroimaging Group
Department for diagnostic and interventional
neuroradiology, Inselspital
Head: Roland Wiest
The workgroup focuses on the development, clinical implemen-tation and validation of novel CT
and MR based technologies that aid in the diagnosis
of CNS disorders.
ISTBPages: 7 -17
Magnetic Resonance Spectroscopy and
Methodology
Department of Clinical Research, Inselspital
Head: Chris Boesch
The group works on methodological developments and applications of
magnetic resonance imaging (MRI) and spectroscopy
(MRS) in humans.
Neurovascular Treatment Group
Department for diagnostic and interventional
neuroradiology, Inselspital
Head: Jan Gralla
The group investigates the evaluation of neurovascular diseases including
the in-vivo development and application of endovascular
treatment techniques.
ARTORGPages: 19 - 37
Division of Medical Radiation Physics
Department of Radiation Oncology, Inselspital
Head: Peter Manser
Next to implementation of newmethods in radiation therapy, the
group addresses fundamental research in medical radiation
physics.
Inner Ear Research Laboratory
Department of Otorhinolaryngology, Head & Neck Surgery, Inselspital
Head: Pascal Senn
The inner ear research laboratory employs stem cell and nanotechnology to improve cochlear implant systems
and develop future hearing loss therapies based on regenerative principles.
Department of Biomedical Photonics
Institute of Applied Physics
Head: Martin Frenz
The group develops novel optical tomographic imaging modalities and laser procedures for medical
diagnosis and treatment of diseases.
Bronchoscopy Unit
Department of Respiratory Medicine, Inselspital
Head: Christophe von Garnier
The research interests of the unit include the integration of multiple
imaging modalities (PET-CT, conventional CT, ultrasound) for
navigated bronchoscopies.
39Annual Report 2012
Mechanical Design and Production
Email: [email protected]
Urs Ronald Sara Patrick Lukas Sascha
related to the research pursuits of the ISTB and ARTORG.
manufacturing process from concept to production. This includes computer assisted design (CAD) modelling, pro
industrial and academic external research collaborators with their mechanical design and production needs.
training encompasses the skills required to safely and
the knowledge required to achieve the best results with
Training and Education On the 1st of August 2012 Lukas Rufener became our new apprentice Polymechanic. He is currently completing
at the University of Bern before continuing with us as part
exam at the end of the second year and we congratulate him for his excellent results. In the coming two years his
manufacturing more ambitious parts.In June Sara Corinti completed her apprenticeship exam successfully with a good result and we congratulate her. After completion of her training she was employed until the end of December in our machine shop as a Polytechnician.
Research Equipment Design & Manufacturing (ISTB)As expected, the requirements of a machine shop sup
researched in the ISTB yield a number of diverse design and production requests from prototype clinical and
kinematic testing, as well as imaging system accessories and calibration equipment. The following illustrations
Compression DeviceIn 2005 a vertebral compression chamber was constructed
ing forces up to 4 kN. This year two further chambers of
forces of up to 10 kN, were and successfully implemented
PMMA Plate Calibration Phantom
was constructed to serve as a universal calibration body
forces of up 10 kN.
PMMA plate calibration phantom for calibration of C-Arm imaging.
40 Annual Report 2012
The phantom enables different patterns of spheres on
location of a contrast element to be determined for a
Spine HexapodA robotic device was designed and developed in order to
ture of the device.
Macro Tensile Test SetupOver the last few years we have created a number of test pieces for the Dentistry Clinic at the Bern University
Hospital, as part of an ongoing collaboration. In 2012 we successfully developed a number of molds for new dental
tensile testing using a setup which included a collet and a
Research Equipment Design & Manufacturing(ARTORG)The workshop at the ARTORG Center was led by Sascha Weidner from January 2011 until the end of February 2012; we thank him for his work and wish him all the best for the future. The workshop leadership was taken over by Ronald Ramseier, former polymechanic at the ISTB
the 1st
already been completed since he began.As the ARTORG workshop pursues many of the same
ship was formed between the two groups. This partner
High Accuracy Drill Spindle
minimally invasive cochlear implantation, a procedure which requires an exact and repeatable navigation and drilling process. Conventional surgical drill bits, constructed of stainless steel, are much more compliant than high speed steel or carbide tools used in the machining industry. These compliant tools, combined with a certain degree of backlash in the surgical drill spindle, result in poor drilling accuracy. In order to reduce errors arising from the drilling process, a new backlash free high speed drill spindle was developed.
Robotic hexapod designed for the measurement of force-displacement characteristics of vertebral bodies.
Custom drill hand piece for a minimally invasive robotic system.
Components of the macro tensile test set up for testing of dental lling samples.
Annual Report2011
18 ISTB 2011
+41 31 631 59 35
Group Members
Mechanical Design & Production
Profile
Projects
UrsRohrer
The primary function of the Mechanical Design and Production (MDP) group is the co-development and manufacturing of mechanical and electro-mechanical components related to the research pursuits of the ISTB. The MDP group supports all levels
with SolidWorks®, prototyping and production with technical drawings, standard tooling, computer assisted manufacturing
their mechanical design and production needs.
machine shop tooling and equipment, the knowledge required to achieve the best results with a variety of materials, and the
Trial apprenticeships are used as a means to evaluate candidates for a full apprenticeship in the MDP group. This year, we
2012 as a Polymechanic.
After 1 1/2 years of service as a mechanic and foreman, Pascal Aebersold has chosen to seek a new professional challenge and left the Institute at the end of May. We greatly appreciated Pascal as an independent and responsible worker, and wish him all the best in his future endeavors.
Research Equipment Design & Manufacturing
Biomechanics Division: Electro-SpinningTogether with Jochen Walser, we were able to produce some challenging and interesting components for the electro-spinning project. An expanding collector enables the system to produce tubes of varying diameter with a simple adjustment of the coll-ector. Two special grippers with plastic inserts were also produced for mechanical testing of the electro-spun material.
19ISTB 2011
model for a study prototype was created together with Dr. Lennart Stieglitz from the neurosurgical department at Inselspital in Bern, which performs both functions in a single component.
Bone - Retractor Bending JigTogether with an industrial partner specialized in surgical technology, we were able to design and construct a jig used to bend
CAS Division Project: Instrumented micro forcepsThe goal of this project was to instrument miniature forceps with sensors which enable the device to measure force and dis-
Bragg grating sensors had to be milled with an endmill smaller than 0.5 mm in diameter. Though very challenging, we were able to successfully complete this project.
Annual Report2010
18
Group Members
Mechanical Design & Production
Profile
Projects
UrsRohrer
Research Equipment Design & Manufacturing
ARTORG Machine Shop
19
Loading Device IVD
HIP Impactor
Three Point Bending Device
Revival for PAO Chisel Navigation
Housing for Liver Surgery Remote Control
