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On the operating rooms ventilation system
, Article 12th International Conference on Indoor Air Quality and Climate 2011 ; Volume 4 , 2011 , Pages 3194-3199 ; 9781627482721 (ISBN) ; Ahmadi, G ; Saidi, M. H ; Sharif University of Technology
Abstract
Surgical site infection (SSI) is one of the important infectious problems in hospitals. It is well known that appropriate ventilation strategy is most effective way to control bacteria-carrying airborne particles responsible for SSI. With considerable improvement in the computational capacity of computers, computational fluid dynamics (CFD) technique has been widely used to study the indoor airflow and contaminant dispersion over the enclosures. In this research, the effect of inlet air velocity on the ultra-clean ventilation system performance is investigated Eulerian-Lagrangian numerical approach. The results show that surgical wound contamination may be highly affected by inlet velocity....
Operating Theatre Scheduling to Minimize Waiting Times
, M.Sc. Thesis Sharif University of Technology ; Akbari Jokar, Mohammad Reza (Supervisor)
Abstract
The most common procedure of operating theatre scheduling in hospitals consists of two major steps called assignment and sequencing. In the first step, patients are assigned to a so called block (part of an operating room time in a specific day). The sequencing step is usually executed a day before the pre-defined day. In this step, the head nurse makes a sequence of the operations while she consults with the relating surgeons and considers all of the conditions and then the patients are informed about their operation time. Although the head nurse does not have a biased look, surgeons usually believe that the schedule is unfair to them. Moreover, the schedule is prepared through trial and...
Robust Assigning for the Operating Theatre at the Strategic And the Tactical Level, Regarding Elective and Non-elective Patients
, M.Sc. Thesis Sharif University of Technology ; Modarres Yazdi, Mohammad (Supervisor)
Abstract
The Operating Room (OR) is one of the most expensive resources of any hospital. Surgical costs typically account for approximately 40% of the total hospital resource costs, while surgeries typically generate around 67% of hospital revenues. Therefore, it is important to control the surgery costs while maintaining a high quality of care. In this study, all the decisions related to the Operating Theatre are being hierarchically considered in strategic, tactical and operational levels. The Operating Theatre consists of operation rooms, a recovery unit, an intensive care unit (ICU), a critical care unit (CCU), and ward units. In this model there exist many uncertainties, which the robust...
Numerical Modeling of Surgical Lights Effects on the Operating Room Enviroment
, M.Sc. Thesis Sharif University of Technology ; Saeeidi, Mohammad Hassan (Co-Advisor) ; Kazemzadeh Hannani, Siamak (Co-Advisor) ; Sani, Mahdi (Co-Advisor)
Abstract
Cleanrooms have a broad scope of applications from electronics, pharmacy, biotechnology to hospital industries, and are susceptible to fine and ultra-fine particles. In this work operating room in the category of hospital applications is chosen. Airborne particles in the operating room depends on many factors such as room geometry, inlet and outlet design, air displacement rate, obstacles, etc. Surgical light is one of the most critical obstacles in the operating room as it is upstream to the surgery zone. The study presented in this thesis aimed to numerically investigate the influence of radiation emitted from the medical lamps on the indoor airflow quality in operating room environment....
Investigation of Obstacles Effects on the Particles Dispersion and Deposition in Cleanrooms
, Ph.D. Dissertation Sharif University of Technology ; Saeedi, Mohammad Hassan (Supervisor) ; Ahmadi, Goodarz ($item.subfieldsMap.e)
Abstract
Cleanrooms have been widely used in many industries. The main goal in designing a clean space is to control the level of particles concentration. As a result, introduction, generation, and retention of airborne particles inside the environment need to be minimized. In this research, the effects of main parameters on the generation and deposition of particles through cleanrooms have been numerically investigated. At first, the role of geometric features of swirl diffusers on the induction effect and the resultant air mixing has been evaluated. Using parametric study approach, the diffuser geometry has been optimized and sensitivity of its optimum features to the airflow rate has been...
Phase-type Distribution in the Sequencing and Scheduling Problem and its Application in Operating Room Problem
, Ph.D. Dissertation Sharif University of Technology ; Salmasi, Nasser (Supervisor) ; Modarres, Mohammad (Supervisor)
Abstract
Operating rooms (ORs) are considered as the most valuable resource in hospital, which are the largest revenue generator and, at the same time, the largest cost center of hospitals. Hospital managers have been interested in improving the efficiency and effectiveness of ORs by developing modern planning and scheduling tools. This research studies the stochastic operating room (OR) scheduling problem integrated by Post-Anesthesia Care Unit (PACU), named the operating theater room (OTR) problem. Due to the inherent uncertainty in surgery duration and its consecutive PACU time, the completion time of the operation of a patient should be modeled as the sum of a number of random variables. Several...
Computer modeling of the operating room ventilation performance in connection with surgical site infection
, Article Scientia Iranica ; Volume 27, Issue 2 , 2020 , Pages 704-714 ; Saidi, M. H ; Ahmadi, G ; Sharif University of Technology
Sharif University of Technology
2020
Abstract
The primary source of surgical site infection is the deposition of flakes released from the exposed skin of surgical staff or the patient on the exposed surgical wound. In this study, a computational model for simulating air ow and thermal conditions in an operating room is developed, and transport and deposition of particulate contaminants near the wound are analyzed. The results show the formation of a thermal plume over the wound tissue, which is typically at a higher temperature than the surrounding. The thermal plume protects the wound from the deposition of contaminants. In addition, the computational model predicts an optimum value for the inlet air velocity that is mainly maintaining...
The Planning and Scheduling of Operating Rooms under the Open Scheduling Strategy and Uncertainty
, M.Sc. Thesis Sharif University of Technology ; Rafiee, Majid (Supervisor)
Abstract
Operating rooms has always been considered as one of the most expensive, yet most profitable part of a hospital. Since many units in the hospitals are related to the operating room, improving efficiency in the operating room will result in increased efficiency in other units, so offering proper solutions in this area is very important. Suitable Planning and scheduling has a great impact on increasing the level of service and efficiency of the hospital. in this thesis, a mixed integer programming model for scheduling weekly elective patients in the surgical theater with the objective of maximizing the number of elective patients for the surgery and also the workload of the operating room...
Planning and Scheduling Operating Theater Subject to Capacity after Surgery Unit
, M.Sc. Thesis Sharif University of Technology ; Eshghi, Koroush (Supervisor)
Abstract
In today’s modern world, there is an ever-increasing need for developing new ways to provide service in a health system in order to gain the satisfaction of the patients with economically effective methods. One of the challenges faced by a hospital is the allocation of the surgeries to the available surgeans. In this study, a mathematical model is proposed to schedule the operation rooms while considering the daily availability of the doctors, the expense of the operations, overtime hours, and post-operation care. The mathematical programming model is optimized as a stochastic model by using the approach of BIM.
An essential aspect of a hospital system design is the uncertainity of the...
An essential aspect of a hospital system design is the uncertainity of the...
Proposing a Solution Algorithm for Operating Room Scheduling Problem Using Open Scheduling and Elective Patient Strategy
, M.Sc. Thesis Sharif University of Technology ; Rafiee, Majid (Supervisor)
Abstract
Operating rooms have always been the most expensive and also the most profitable section in hospitals which include approximately one third of cost and two third of income. The management always wants to decrease the cost of hospitals. On the other hand, usually this goal stands against other goals such as patient’s satisfaction. So the manager should make a balance between these goals. In this research, we will propose an integer programming model for operating room scheduling problem without uncertainty for elective patients. In order to make the model more realistic, we want to make connection between operating room theatre and intensive care units. Also, we will consider desirable...
The Anxiety-based Scheduling of Operating Rooms: An Idea to Develop Psyche-based Optimization
, M.Sc. Thesis Sharif University of Technology ; Salmasi, Naser (Supervisor)
Abstract
The traditional point of view on the scheduling of the healthcare systems, which is in common with the scheduling of other service and manufacturing systems, has contributed to inattention to patients’ psychological status and has given rise to many negative effects not only on them, but also on hospitals. However, this perspective has not been modified yet with respect to the features of healthcare systems, in which patients, rather that machines, are the main entities of the system. In this study, to address this draw back, a new concept, psyche-based optimization, as well as a new scheduling problem, anxiety-based scheduling of operating rooms, as the advent of this concept, have been...
Patient Scheduling under Uncertainty and Hospital Resource Allocation with Patient Waiting Time, Personnel Overtime and Idleness Minimization Approach and with Application of Queuing Theory and Analytical Tools
, M.Sc. Thesis Sharif University of Technology ; Shadrokh, Shahram (Supervisor)
Abstract
Scheduling problem specially surgery room scheduling is noteworthy and well known in optimization and machine learning literature which improve resource usage means cost reduction and patient experience means satisfaction increase.Surgery Rooms are one of the most costly section of the hospital. In addition to this, Surgeon are expensive resource and all the hospitals have limited capacity. By scheduling we can improve patient’s experience and resource management. That’s why scheduling Surgery Room is important and noteworthy.In this research we consider surgery duration and patient length of stay(LOS) probabilistic. Our approach for handling this is stochastic programming in which our...
Application of Data Mining Methods in Operation Theater Scheduling for Elective Patients
, M.Sc. Thesis Sharif University of Technology ; Varmazyar, Mohsen (Supervisor)
Abstract
According to the growing population and the need to make optimal use of available resources, the discussion of planning and scheduling in healthcare will be useful. One of the most expensive and lucrative sections in a hospital, which always spends a large percentage of renewable and non-renewable resources, is the Operating rooms (ORs). These ORs are the most important part of the hospital in terms of health and financial issues. In these scheduling problems, in order to be able to model the real situation, we needed to consider the recovery section integrated with the ORs. Also, the duration of surgery and stay in the recovery rooms are considered stochastic. In this study, we solve the...
A novel deterministic model for simultaneous weekly assignment and scheduling decision-making in operating theaters
, Article Scientia Iranica ; Volume 24, Issue 4 , 2017 , Pages 2035-2049 ; 10263098 (ISSN) ; Fatemi Ghomi, S. M. T ; Hooshangi Tabrizi, P ; Sharif University of Technology
Abstract
This paper studies a simultaneous weekly assignment and scheduling decisionmaking problem in operating theaters with elective patients. Because of limited recourses in hospitals, considering assignment and scheduling decisions simultaneously can help mangers exploit the available resources more efficiently and make the work-load uniformly distributed during the planning horizon. This procedure can significantly reduce hospital costs and increase satisfaction of patients and personnel. This paper formulates the mentioned problem as a Mixed Integer Linear Program (MILP) considering applicable assumptions like finite recovery beds and limitation of equipment. Since the problem is NP-hard, in...
Stochastic Programming Approach for Resource Assignment and Patient Scheduling
, M.Sc. Thesis Sharif University of Technology ; Modarres Yazdi, Mohammad (Supervisor)
Abstract
In this study, we examine all decisions related to operating room planning and scheduling problem by considering uncertainty in surgery durations. To achieve this purpose, first, a mixed integer linear program is developed to determine the master surgical schedule. Then, two different approaches are investigated to model the weekly planning and scheduling of elective patients problem considering uncertain surgery durations. In the first approach, a unified model is proposed and an effective and efficient method, based on the recently introduced anarchic society optimization algorithm, is developed to solve the problem. In the second approach, first an advance scheduling problem is formulated...
Planning And Scheduling Operating Rooms by Using Modified Block Scheduling Strategy with Considering the Surgical Team and post- Operative Units Constraints
, M.Sc. Thesis Sharif University of Technology ; Salmasi, Naser (Supervisor)
Abstract
provide about 67% of a hospital’s profit. Hospital managers are interested in decreasing the costs as well as increasing the customers’ satisfaction level. In this Thesis, four Mixed- Integer Programming models for planning and scheduling operating rooms are proposed. In the main, the problem is presented in two phases. In The first phase, model assigns the date and the room to each surgical and in second phase the model determines the sequencing of the assigned operation cases. The effects of using three different scheduling strategies (Block and Open and modified block) for assigning operating rooms to surgeons on the planning of surgical cases is studied. Then we proposed one phase model...
Operating Room Scheduling with Data driven Robust Optimization Approach
, M.Sc. Thesis Sharif University of Technology ; Rafiee, Majid (Supervisor)
Abstract
In this thesis we will focus on operating room scheduling considering open strategy and uncertainty in the duration of operations for elective patients. A mixed integer programming model will be proposed having the expected list of patients that are going to be scheduled in the specific time horizon and working hours of doctors with the purpose of maximizing the number of scheduled elective patients in the determined time horizon. We aim to assign each patient to an operating room and a start time regarding operating rooms and surgeons working hours, care units capacity constraints and sequencing constraints. We will define three possible ways for each patient after their operations, naming...
Design and development of an effective low-cost robotic cameraman for laparoscopic surgery: RoboLens
, Article Scientia Iranica ; Volume 18, Issue 1 B , 2011 , Pages 59-71 ; 10263098 (ISSN) ; Farahmand, F ; Meghdari, A ; Karimian, F ; Sharif University of Technology
2011
Abstract
A robotic system was designed and developed to perform the camera handling task during laparoscopic surgery. The system employs an effective low cost mechanism, with a minimum number of actuated DOFs, enabling spherical movement around a remote centre of motion positioned at the the insertion point of the laparoscopic stem. Kinematic analysis showed a high manipulability measure for the system, with the left/right movements directly governed by rotation of the first rotary actuator, and zoom and up/down movements by the simultaneous motions of the linear and second rotary actuators. A prototype of the robot was developed for practical use in an operating room environment. Hands-free operator...