document

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

document

What quantitative mechanical loading stimulates in vitro cultivation best?

Natenstedt, J. (author), Kok, A.C. (author), Dankelman, J. (author), Tuijthof, G.J.M. (author)

Articular cartilage has limited regeneration capacities. One of the factors that appear to affect the in vitro cultivation of articular cartilage is mechanical stimulation. So far, no combination of parameters has been identified that offers the best results. The goal is to review the literature in search of the best available set of...

journal article 2015

document

Surgical Simulator Design and Development

Dankelman, J. (author)

With the introduction of minimally invasive surgery (MIS), it became necessary to develop training methods to learn skills outside the operating room. Several training simulators have become commercially available, but fundamental research into the requirements for effective and efficient training in MIS is still lacking. Three aspects of...

journal article 2007

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Force measurement platform for training and assessment of laparoscopic skills

Horeman, T. (author), Rodrigues, S.P. (author), Jansen, F.W. (author), Dankelman, J. (author), Van den Dobbelsteen, J.J. (author)

Background - To improve endoscopic surgical skills, an increasing number of surgical residents practice on box or virtual-reality (VR) trainers. Current training is mainly focused on hand–eye coordination. Training methods that focus on applying the right amount of force are not yet available. Methods - The aim of this project is to develop a...

journal article 2010

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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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Crossing Total Occlusions: Navigating Towards Recanalization

Sakes, A. (author), Regar, E. (author), Dankelman, J. (author), Breedveld, P. (author)

Chronic total occlusions (CTOs) represent the “last frontier” of percutaneous interventions. The main technical challenges lies in crossing the guidewire into the distal true lumen, which is primarily due to three problems: device buckling during initial puncture, inadequate visualization, and the inability to actively navigate through the CTO....

journal article 2016

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New Technologies Supporting Surgical Interventions and Training of Surgical Skills: A Look at Projects in Europe Supporting Minimally Invasive Techniques

Dankelman, J. (author), Grimbergen, C.A. (author), Stassen, H.G. (author)

journal article 2007

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Patient safety risk factors in minimally invasive surgery: A validation study

Rodrigues, S.P. (author), Ter Kuile, M. (author), Dankelman, J. (author), Jansen, F.W. (author)

This study was conducted to adapt and validate a patient safety (PS) framework for minimally invasive surgery (MIS) as a first step in understanding the clinical relevance of various PS risk factors in MIS. Eight patient safety risk factor domains were identified using frameworks from a systems approach to patient safety. A questionnaire was...

journal article 2012

document

Where are my instruments? Hazards in delivery of surgical instruments

Guédon, A.C.P. (author), Wauben, L.S.G.L. (author), Van der Eijk, A.C. (author), Vernooij, A.S.N. (author), Meeuwsen, F.C. (author), Van der Elst, M. (author), Hoeijmans, V. (author), Dankelman, J. (author), Van den Dobbelsteen, J.J. (author)

Background Unavailability of instruments is recognised to cause delays and stress in the operating room, which can lead to additional risks for the patients. The aim was to provide an overview of the hazards in the entire delivery process of surgical instruments and to provide insight into how Information Technology (IT) could support this...

journal article 2015

document

Assessment of Laparoscopic Skills Based on Force and Motion Parameters

Horeman, T. (author), Dankelman, J. (author), Jansen, F.W. (author), Van den Dobbelsteen, J.J. (author)

Box trainers equipped with sensors may help in acquiring objective information about a trainee's performance while performing training tasks with real instruments. The main aim of this study is to investigate the added value of force parameters with respect to commonly used motion and time parameters such as path length, motion volume, and task...

journal article 2013

document

The Perspective Effect of Wide-Angle Lenses in Laparoscopes

Wentink, M. (author), Fischer, H. (author), Dankelman, J. (author), Stassen, L.P.S. (author), Wieringa, P.A. (author)

Purpose: To evaluate the effect of perspective distortion of wide-angle lenses in laparoscopes on hand-eye coordination during endoscopic manipulation. Methods: Sixteen subjects repeatedly performed a standardized positioning task in a pelvi-trainer under two conditions. The subjects had no prior experience with endoscopic manipulation. In one...

journal article 2002

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Transfer validity of laparoscopic knot-tying training on a VR simulator to a realistic environment: A randomized controlled trial

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

Background- Laparoscopic suturing is one of the most difficult tasks in endoscopic surgery, requiring extensive training. The aim of this study was to determine the transfer validity of knot-tying training on a virtual-reality (VR) simulator to a realistic laparoscopic environment. Methods- Twenty surgical trainees underwent basic eye–hand...

journal article 2007

document

Force sensing in surgical sutures

Horeman, T. (author), Meijer, E.J. (author), Harlaar, J.J. (author), Lange, J.F. (author), Van den Dobbelsteen, J.J. (author), Dankelman, J. (author)

The tension in a suture is an important factor in the process of wound healing. If there is too much tension in the suture, the blood flow is restricted and necrosis can occur. If the tension is too low, the incision opens up and cannot heal properly. The purpose of this paper is to describe the design and evaluation of the Stitch Force (SF)...

journal article 2013

document

Indirect measurement of pinch and pull forces at the shaft of laparoscopic graspers

Van den Dobbelsteen, J.J. (author), Lee, R.A. (author), Van Noorden, M. (author), Dankelman, J. (author)

The grasping instruments used in minimally invasive surgery reduce the ability of the surgeon to feel the forces applied on the tissue, thereby complicating the handling of the tissue and increasing the risk of tissue damage. Force sensors implemented in the forceps of the instruments enable accurate measurements of applied forces, but also...

journal article 2012

document

Discovery of high-level tasks in the operating room

Bouarfa, L. (author), Jonker, P.P. (author), Dankelman, J. (author)

Recognizing and understanding surgical high-level tasks from sensor readings is important for surgical workflow analysis. Surgical high-level task recognition is also a challenging task in ubiquitous computing because of the inherent uncertainty of sensor data and the complexity of the operating room environment. In this paper, we present a...

journal article 2010

document

Retracting and seeking movements during laparoscopic goal-oriented movements. Is the shortest path length optimal?

Chmarra, M.K. (author), Jansen, F.W. (author), Grimbergen, C.A. (author), Dankelman, J. (author)

Aims- Minimally invasive surgery (MIS) requires a high degree of eye–hand coordination from the surgeon. To facilitate the learning process, objective assessment systems based on analysis of the instruments’ motion are being developed. To investigate the influence of performance on motion characteristics, we examined goaloriented movements in a...

journal article 2007

document

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

document

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

document

Visual force feedback in laparoscopic training

Horeman, T. (author), Rodrigues, S.P. (author), Van den Dobbelsteen, J.J. (author), Jansen, F.W. (author), Dankelman, J. (author)

Background - To improve endoscopic surgical skills, an increasing number of surgical residents practice on box or virtual reality (VR) trainers. Current training is focused mainly on hand–eye coordination. Training methods that focus on applying the right amount of force are not yet available. Methods - The aim of this project is to develop a...

journal article 2011

document

An Isolator System for minimally invasive surgery: The new design

Horeman, T. (author), Jansen, F.W. (author), Dankelman, J. (author)

Background - The risk of obtaining a postsurgical infection depends highly on the air quality surrounding the exposed tissue, surgical instruments, and materials. Many isolators for open surgery have been invented to create a contained sterile volume around the exposed tissue. With the use of an isolator, a surgical procedure can be performed...

journal article 2010