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First validation of the PASSPORT training environment for arthroscopic skills

Tuijthoff, G.J.M. (author), Van Sterkenburg, M.N. (author), Sierevelt, I.N. (author), Van Oldenrijk, J. (author), Van Dijk, C.N. (author), Kerkhoffs, G.M.M.J. (author)

The demand for high quality care is in contrast to reduced training time for residents to develop arthroscopic skills. Thereto, simulators are introduced to train skills away from the operating room. In our clinic, a physical simulation environment to Practice Arthroscopic Surgical Skills for Perfect Operative Real-life Treatment (PASSPORT) is...

journal article 2009

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Muscle weakness and lack of reflex gain adaptation predominate during post-stroke posture control of the wrist

Meskers, C.G.M. (author), Schouten, A.C. (author), De Groot, J.H. (author), De Vlugt, E. (author), Van Hilten, B.J.J. (author), Van der Helm, F.C.T. (author), Arendzen, H.J.H. (author)

Background Instead of hyper-reflexia as sole paradigm, post-stroke movement disorders are currently considered the result of a complex interplay between neuronal and muscular properties, modified by level of activity. We used a closed loop system identification technique to quantify individual contributors to wrist joint stiffness during an...

journal article 2009

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A Semianalytical Approach to Large Deflections in Compliant Beams under Point Load

Tolou, N. (author), Herder, J.L. (author)

The deflection of compliant mechanism (CM) which involves geometrical nonlinearity due to large deflection of members continues to be an interesting problem in mechanical systems. This paper deals with an analytical investigation of large deflections in compliant mechanisms. The main objective is to propose a convenient method of solution for...

journal article 2009

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Energy efficient walking with central pattern generators: From passive dynamic walking to biologically inspired control

Verdaasdonk, B.W. (author), Koopman, H.F.J.M. (author), Van der Helm, F.C.T. (author)

Like human walking, passive dynamic walking—i.e. walking down a slope with no actuation except gravity—is energy efficient by exploiting the natural dynamics. In the animal world, neural oscillators termed central pattern generators (CPGs) provide the basic rhythm for muscular activity in locomotion. We present a CPG model, which automatically...

journal article 2009

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Sensory Weighting of Force and Position Feedback in Human Motor Control Tasks

Mugge, W. (author), Schuurmans, J. (author), Schouten, A.C. (author), Van der Helm, F.C.T. (author)

In daily life humans integrate force and position feedback from mechanoreceptors, proprioception, and vision. With handling relatively soft, elastic objects, force and position are related and can be integrated to improve the accuracy of an estimate of either one. Sensory weighting between different sensory systems (e.g., vision and...

journal article 2009

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The monosynaptic Ia afferent pathway can largely explain the stretch duration effect of the long latency M2 response

Schuurmans, J. (author), De Vlugt, E. (author), Schouten, A.C. (author), Meskers, C.G. (author), De Groot, J.H. (author), Van der Helm, F.C.T. (author)

Sudden stretch of active muscle typically results in two characteristic electromyographic responses: the short latency M1 and the long latency M2. The M1 response originates from the monosynaptic Ia afferent reflex pathway. The M2 response is less well understood and is likely a compound response to different afferent inputs mediated by spinal...

journal article 2009

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Impact of early applied upper limb stimulation: The EXPLICIT-stroke programme design

Kwakkel, G. (author), Meskers, C.G.M. (author), Van Wegen, E.E. (author), Lankhorst, G.J. (author), Geurts, A.C.H. (author), Van Kuijk, A.A. (author), Lindeman, E. (author), Visser-Meily, A. (author), Vlugt, E. (author), Arendzen, J.H. (author)

Main claims of the literature are that functional recovery of the paretic upper limb is mainly defined within the first month post stroke and that rehabilitation services should preferably be applied intensively and in a task-oriented way within this particular time window. EXplaining PLastICITy after stroke (acronym EXPLICIT-stroke) aims to...

journal article 2008

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An Electric Scooter Simulation Program for Training the Driving Skills of Stroke Patients with Mobility Problems: A Pilot Study

Jannink, M.J.A. (author), Erren-Wolters, C.V. (author), De Kort, A.C. (author), Van der Kooij, H. (author)

This paper describes an electric scooter simulation program and a first evaluation study in which we explored if it is possible to train the driving skills of future users of electric mobility scooters by means of an electric scooter simulation program in addition to conventional electric scooter training. Within this explorative study, 10...

journal article 2008

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Human error in strabismus surgery: Quantification with a sensitivity analysis

Schutte, S. (author), Polling, J.R. (author), Van der Helm, F.C.T. (author), Simonsz, H.J. (author)

Background- Reoperations are frequently necessary in strabismus surgery. The goal of this study was to analyze human-error related factors that introduce variability in the results of strabismus surgery in a systematic fashion. Methods- We identified the primary factors that influence the outcome of strabismus surgery. For each of the human...

journal article 2008

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Requirements for the design and implementation of checklists for surgical processes

Verdaasdonk, E.G.G. (author), Stassen, L.P.S. (author), Widhiasmara, P.P. (author), Dankelman, J. (author)

Background- The use of checklists is a promising strategy for improving patient safety in all types of surgical processes inside and outside the operating room. This article aims to provide requirements and implementation of checklists for surgical processes. Methods- The literature on checklist use in the operating room was reviewed based on...

journal article 2008

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Can a structured checklist prevent problems with laparoscopic equipment?

Verdaasdonk, E.G.G. (author), Stassen, L.P.S. (author), Hoffmann, W.F. (author), Van der Elst, M. (author), Dankelman, J. (author)

Background A high incidence of problems with the technical equipment is known to occur during routine laparoscopic procedures. Use of a structured checklist of preparatory measures could help to prevent these problems. This study aimed to determine the extent to which a checklist reduced the number of incidents with technical laparoscopic...

journal article 2008

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Fall detection in walking robots by multi-way principal component analysis

Karssen, J.G. (author), Wisse, M. (author)

Large disturbances can cause a biped to fall. If an upcoming fall can be detected, damage can be minimized or the fall can be prevented. We introduce the multi-way principal component analysis (MPCA) method for the detection of upcoming falls. We study the detection capability of the MPCA method in a simulation study with the simplest walking...

journal article 2008

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Design of Perturbation Signals for the Estimation of Proprioceptive Reflexes

Schouten, A.C. (author), De Vlugt, E. (author), Van der Helm, F.C.T. (author)

This study aimed to identify the functional contribution of reflexes to human motor control during posture maintenance. Continuous random force disturbances were applied at the hand while the subjects were instructed to minimize the deviation resulting from the force disturbances. The results were analyzed in the frequency domain with frequency...

journal article 2008

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Force feedback and basic laparoscopic skills

Chmarra, M.K. (author), Dankelman, J. (author), Van den Dobbelsteen, J.J. (author), Jansen, F.W. (author)

Background - Not much is known about the exact role offorce feedback in laparoscopy. This study aimed to determine whether force feedback influences movements of instruments during training in laparoscopic tasks and whether force feedback is required for training in basic laparoscopic force application tasks. Methods - A group of 19 gynecologic...

journal article 2008

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Incorporation of proficiency criteria for basic laparoscopic skills training: How does it work?

Verdaasdonk, E.G. (author), Dankelman, J. (author), Lange, J.F. (author), Stassen, L.P.S. (author)

Background - It is desirable that surgical trainees are proficient in basic laparoscopic motor skills (eye–hand coordination). The present study evaluated the use of predefined proficiency criteria on a basic virtual reality (VR) simulator in preparation for a laparoscopic course on animal models. Methods - Twenty-eight surgical trainees who...

journal article 2008

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Swing-Leg Retraction for Limit Cycle Walkers Improves Disturbance Rejection

Hobbelen, D.G.E. (author), Wisse, M. (author)

Limit cycle walkers are bipeds that exhibit a stable cyclic gaitwithout requiring local controllability at all times during gait. A well-known example of limit cycle walking is McGeer’s “passive dynamic walking,” but the concept expands to actuated bipeds as involved in this study. One of the stabilizing effects in limit cycle walkers is the...

journal article 2008

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Mucoadhesive films inside the colonic tube: Performance in a three-dimensional world

Dodou, D. (author), Van den Berg, M. (author), Van Gennip, J. (author), Breedveld, P. (author), Wieringa, P.A. (author)

A self-propelling colonoscopic device moving inside the colonic tube should be able to periodically grip safely to the colonic wall as well as to manipulate the generated friction. The feasibility of achieving high grip and friction manipulation by covering the device with mucoadhesive films is experimentally tested. More precisely, the...

journal article 2008

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A review of function modeling: Approaches and applications

Erden, M.S. (author), Komoto, H. (author), Van Beek, T.J. (author), D'Amelio, V. (author), Echavarria, E. (author), Tomiyama, T. (author)

This work is aimed at establishing a common frame and understanding of function modeling (FM) for our ongoing research activities. A comparative review of the literature is performed to grasp the various FM approaches with their commonalities and differences. The relations of FM with the research fields of artificial intelligence, design theory,...

journal article 2008

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Model prediction of subendocardial perfusion of the coronary circulation in the presence of an epicardial coronary artery stenosis

Van den Wijngaard, J.P.H.M. (author), Kolyva, C. (author), Siebes, M. (author), Dankelman, J. (author), Van Gemert, M.J.C. (author), Piek, J.J. (author), Spaan, J.A.E. (author)

The subendocardium is most vulnerable to ischemia, which is ameliorated by relaxation during diastole and increased coronary pressure. Recent clinical techniques permit the measuring of subendocardial perfusion and it is therefore important to gain insight into how measurements depend on perfusion conditions of the heart. Using data from...

journal article 2008

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A Two-Dimensional Weighting Function for a Driver Assistance System

De Winter, J. (author), Mulder, M. (author), Van Paassen, M.M. (author), Abbink, D.A. (author), Wieringa, P.A. (author)

Driver assistance systems that supply force feedback (FF) on the accelerator commonly use relative distance and velocity with respect to the closest lead vehicle in front of the own vehicle. This 1-D feedback might not accurately represent the situation and can cause unwanted step-shaped changes in the FFs during lateral maneuvers. To address...

journal article 2008