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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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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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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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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

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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

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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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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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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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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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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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Objective classification of residents based on their psychomotor laparoscopic skills

Chmarra, M.K. (author), Klein, S. (author), De Winter, J.C.F. (author), Jansen, F.W. (author), Dankelman, J. (author)

Background - From the clinical point of view, it is important to recognize residents’ level of expertise with regard to basic psychomotor skills. For that reason, surgeons and surgical organizations (e.g., Acreditation Council for Graduate Medical Education, ACGME) are calling for assessment tools that credential residents as technically...

journal article 2009

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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

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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

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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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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

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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

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Implications of the law on video recording in clinical practice

Henken, K.R. (author), Jansen, F.W. (author), Klein, J. (author), Stassen, L.P.S. (author), Dankelman, J. (author), Van den Dobbelsteen, J.J. (author)

Background Technological developments allow for a variety of applications of video recording in health care, including endoscopic procedures. Although the value of video registration is recognized, medicolegal concerns regarding the privacy of patients and professionals are growing. A clear understanding of the legal framework is lacking....

journal article 2012

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Assessment of joystick and wrist control in hand-held articulated laparoscopic prototypes

Okken, L.M. (author), Chmarra, M.K. (author), Hiemstra, E. (author), Jansen, F.W. (author), Dankelman, J. (author)

Various steerable instruments with flexible distal tip have been developed for laparoscopic surgery. The problem of steering such instruments, however, remains a challenge, because no study investigated which control method is the most suitable. This study was designed to examine whether thumb (joystick) or wrist control method is designated for...

journal article 2012

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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

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Differences in abdominal force between conventional and single port laparoscopy

Sun, S. (author), Dankelman, J. (author), Horeman, T. (author)

In laparoendoscopic single-site surgery (LESS), only one single incision is used to introduce all instruments into the abdominal cavity. The introduction of multi-channel single-port devices enabled insertion of laparoscopic instruments and laparoscope through one single entry point instead of multiple entry points in conventional laparoscopic...

conference paper 2013