Tissue engineering is an emerging area with an aim to create artificial tissues or organs by employing methods of biology, engineering and material science. In tissue engineering, scaffolds are three-dimensional (3D) structure made from biomaterials with highly interconnected pore networks or microstructure, and are used to provide the mechanical and biological cues to guide cell differentiation in order to form desired three-dimensional tissues or functional organs. Hence, tissue scaffold plays a critical role in tissue engineering. However, fabrication of such scaffolds has proven to be a challenge task. One important barrier is the inability to fabricate scaffolds with designed pore size and porosity to mimic the microstructure of native tissue. Another issue is the prediction of process-induced cell damage in the cell-involved scaffold fabrication processes. By addressing these key issues involved in the scaffold fabrication, this research work is aimed at developing methods and models to represent the dispensing-based solid free form scaffold fabrication process with and without the presence of living cells.<p> The microstructure of scaffolds, featured by the pore size and porosity, has shown to significantly affect the biological and mechanical properties of formed tissues. As such, during fabrication process the ability to predict and determine scaffold pore size and porosity is of great importance. In the first part of this research, the flow behaviours of the scaffold materials were investigated and a model of the flow rate of material dispensed during the scaffold fabrication was developed. On this basis, the pore size and porosity of the scaffolds fabricated were represented by developing a mathematical model. Scaffold fabrication experiments using colloidal gels with different hydroxylapatite volume fractions were carried out and the results obtained agreed with those from model simulations, indicating the effectiveness of the models developed. The availability of these models makes it possible to control the scaffold fabrication process rigorously, instead of relying upon a trial and error process as previously reported.<p> In the scaffold fabrication process with the presence of living cells, cells are continuously subjected to mechanical forces. If the forces exceed certain level and/or the forces are applied beyond certain time periods, cell damage may result. In the second part of this research, a method to quantify the cell damage in the bio-dispensing process is developed. This method consists of two steps: one step is to establish cell damage models or laws to relate cell damage to the hydrostatic pressure / shear stress that is applied on cells; and the second step is to represent the process-induced forces that cells experience during the bio-dispensing process and then apply the established cell damage law to model the percent cell damage in the process. Based on the developed method, the cell damage percents in the scaffold fabrication processes that employ two types of dispensing needles, i.e., tapered and cylindrical needles, respectively, were investigated and compared. Also, the difference in cell damage under the high and low shear stress conditions was investigated, and a method was developed to establish the cell damage law directly from the bio-dispensing process. To validate the aforementioned methods and models, experiments of fabricating scaffolds incorporating Schwann cells or 3T3 fibroblasts were carried out and the percent cell damage were measured and compared with the simulation results. The validated models allow one to determine of the influence of process parameters, such as the air pressure applied to the process and the needle geometry, on cell damage and then optimize these values to preserve cell viability and/or achieve the desired cell distribution within the scaffolds.

Tissue engineering is an emerging area with an aim to create artificial tissues or organs by employing methods of biology, engineering and material science. In tissue engineering, scaffolds are three-dimensional (3D) structure made from biomaterials with highly interconnected pore networks or microstructure, and are used to provide the mechanical and biological cues to guide cell differentiation in order to form desired three-dimensional tissues or functional organs. Hence, tissue scaffold plays a critical role in tissue engineering. However, fabrication of such scaffolds has proven to be a challenge task. One important barrier is the inability to fabricate scaffolds with designed pore size and porosity to mimic the microstructure of native tissue. Another issue is the prediction of process-induced cell damage in the cell-involved scaffold fabrication processes. By addressing these key issues involved in the scaffold fabrication, this research work is aimed at developing methods and models to represent the dispensing-based solid free form scaffold fabrication process with and without the presence of living cells.<p> The microstructure of scaffolds, featured by the pore size and porosity, has shown to significantly affect the biological and mechanical properties of formed tissues. As such, during fabrication process the ability to predict and determine scaffold pore size and porosity is of great importance. In the first part of this research, the flow behaviours of the scaffold materials were investigated and a model of the flow rate of material dispensed during the scaffold fabrication was developed. On this basis, the pore size and porosity of the scaffolds fabricated were represented by developing a mathematical model. Scaffold fabrication experiments using colloidal gels with different hydroxylapatite volume fractions were carried out and the results obtained agreed with those from model simulations, indicating the effectiveness of the models developed. The availability of these models makes it possible to control the scaffold fabrication process rigorously, instead of relying upon a trial and error process as previously reported.<p> In the scaffold fabrication process with the presence of living cells, cells are continuously subjected to mechanical forces. If the forces exceed certain level and/or the forces are applied beyond certain time periods, cell damage may result. In the second part of this research, a method to quantify the cell damage in the bio-dispensing process is developed. This method consists of two steps: one step is to establish cell damage models or laws to relate cell damage to the hydrostatic pressure / shear stress that is applied on cells; and the second step is to represent the process-induced forces that cells experience during the bio-dispensing process and then apply the established cell damage law to model the percent cell damage in the process. Based on the developed method, the cell damage percents in the scaffold fabrication processes that employ two types of dispensing needles, i.e., tapered and cylindrical needles, respectively, were investigated and compared. Also, the difference in cell damage under the high and low shear stress conditions was investigated, and a method was developed to establish the cell damage law directly from the bio-dispensing process. To validate the aforementioned methods and models, experiments of fabricating scaffolds incorporating Schwann cells or 3T3 fibroblasts were carried out and the percent cell damage were measured and compared with the simulation results. The validated models allow one to determine of the influence of process parameters, such as the air pressure applied to the process and the needle geometry, on cell damage and then optimize these values to preserve cell viability and/or achieve the desired cell distribution within the scaffolds.

Class of 2005 Abstract / Objectives: 1) Determine the compliance rate with 12 dispensing workflow criteria; 2) note if any dispensing errors occurred; and 3) summarize characteristics of the pharmacies studied (pharmacy staffing, dispensing workload, presence of a drive-through window, etc.). Methods: At least fifty out-window (i.e., pharmacy prescription pick up window) transactions per store were observed within 18 community retail pharmacies. Based on the historic pharmacy error incidence reports, pharmacies were categorized as being either high- or low-risk pharmacies. The compliance rates for the dispensing workflow criteria were observed between high- and low-risk pharmacies and also between different employee categories. Employee categories included pharmacists, pharmacy interns, and pharmacy technicians who were involved in the dispensing process. Results: Between August 2004 and January 2005, a total of 950 out-window transactions were observed. There were statistically significant differences seen between high- and low-risk pharmacies and between the various categories of employees. The lack of the verification of patients’ name and number of prescriptions being picked up were procedures that were more commonly associated with pharmacies reported to have high dispensing error rates. Implications: This study identified several areas where the dispensing workflow criteria were not being performed. Based on this study, the lack of the verification of patients’ name and number of prescriptions being picked up were procedures that were more commonly associated with pharmacies reported to have high dispensing error rates.

Objectives: To examine the extent to which pharmacy students’ attitudes, subjective norm beliefs, and perceived behavioral control beliefs explain gray dispensing decisions, using the theory of planned behavior (TPB) as a framework. Method: Third professional year pharmacy students (n=159) from two academic cohorts were provided three written case scenarios: (1) a dentist prescribing outside of his scope of practice; (2) a physician prescribing for a family member; and (3) a patient who was out of refills on insulin. A brief questionnaire assessed TPB constructs, whether or not the student would dispense the medication, and the number of times the student would dispense in 10 similar situations. Composite scores were calculated for TPB constructs after analyzing internal consistency reliability. Linear regression techniques were used to analyze the influence of the constructs on mean intent to dispense in similar scenarios. Results: The percent of students who indicated they would dispense in each scenario was 68% in scenario 1, 74% in scenario 2, and 81% in scenario 3. For all case scenarios, mean intent to dispense in similar scenarios was explained by attitude scores (p≤0.006). For the insulin refill and family prescribing cases, mean intent to dispense was also explained by subjective norm beliefs (pImplications: Student attitudes consistently predicted intention to dispense across the gray scenarios. These findings can be used to develop and target upstream TPB construct interventions in pharmacy education that influence students’ downstream dispensing decisions. Additional research is warranted to determine if TBP constructs similarly explain the dispensing behaviors of practicing pharmacists.

Abstract This research aims to study the current situation of the community pharmacists¡¦ services, such as the collaboration mode with hospitals and medical institutes corresponding to the ¡§Separation of Prescribing and Dispensing¡¨ (Separation of P&D) in Taiwan and prescription dispensing policies, the service orientation, and the operation results in Kaohsiung City, where the Separation of P&D was implemented as early as March 1997. Furthermore, this research also aims to understand the cognition of the community pharmacists upon Pharmaceutical Services and their service orientation. It was discovered from 67 effective samples that the amount of prescriptions dispensed to those registered National Health Insurance (NHI) pharmacies were still few, hence the current situation of Separation of P&D is not that satisfying. In addition, the amount of prescriptions dispensed to community pharmacies joining the NHI were significantly more than those who did not join. Moreover, as far as for those registered NHI pharmacies collaborating with hospitals and medical institutes are concerned, the opportunity for them to receive prescriptions is far from those registered NHI pharmacies that did not collaborate with hospitals and medical institutes. The amount of prescriptions dispensed has a significant and positive correlation to the increasing of pharmacy business. In light of this, it can be said that the collaboration mode between registered NHI pharmacies and hospitals and medical institutes helps with the implementation of the Separation of P&D. The cognition of pharmacist¡¦s practicing can be divided into five categories according to factor analysis, and they are; ¡§Health Maintaining¡¨, ¡§Health Enhancing¡¨, ¡§Pharmaceutical Professional Service¡¨, ¡§Pharmaceuticals Management ¡¨, and ¡§Specialists Consultation¡¨. This research discovered that when the practicing credential is a pharmacist instead of pharmaceutical student, the service cognition on health maintaining, health enhancing, pharmaceutical professional service, and specialist¡¦s consultation were significantly different. The cognition of a pharmacist upon health enhancing and pharmaceuticals control showed significant and positive correlation to his/her business volume. Although the Separation of P&D has been implemented for over six years, and most of the regions in this country have conformed to the P&D separation regulations and the business has been carried out, the outcomes have not met the expectation, and the medicine circle alone cannot solve such problem. It needs a comprehensive consideration and review to effectively implement the existing policies.

Class of 2010 Abstract / OBJECTIVES: The objective of this study is to compare the number of medication refill errors that occur between the Pyxis Medstation 3500 and the Pyxis PARx automated dispensing systems. The accuracy of refilling Pyxis Medstation 3500 automated dispensing machines by pharmacy technicians at the University Medical Center (UMC) was assessed during six days in July 2009. The accuracy was then reassessed over the course of five days in September 2009, one month after implementation of the new Pyxis PARx barcode technology in August. All medications in both the morning and afternoon Pyxis refill reports generated by the UMC inpatient pharmacy were audited during the chosen days. METHODS: The accuracy of refilling Pyxis Medstation 3500 automated dispensing machines by pharmacy technicians at a 350-bed, tertiary-care, teaching hospital with a total of 50 automated dispensing systems was assessed during five days in July 2009. The accuracy was then reassessed over the course of five days in September 2009, one month after implementation of the new Pyxis PARx barcode technology in August. It was assumed that the following types of medication refill errors would be reduced: 1)Wrong drug, Wrong strength 2) Wrong drug, Right strength 3) Right drug, Wrong strength 4) Filling error/Wrong pocket 5) Overfill of pocket 6) Expired medication 7) Right drug, Wrong form. This study was a prospective evaluation of medication refill errors between an older automated dispensing system (Pyxis Medstation) and a newer system (Pyxis PARx). The addition of PARx barcode technology automates the pick and delivery method in order to enhance security during the medication refill process. When the appropriate drawer is opened, the medication must be scanned using the handheld scanner to make sure the correct medication is being refilled. All medications from each Pyxis refill report on the chosen days were audited during pre and post implementation of the new Pyxis PARx barcode technology. Medications to be audited were identified by collecting data from each automated dispensing system listed on the refill reports for the previous day. Audits were performed on the following day (i.e., Monday’s refill reports was audited on Tuesday) by study investigators. Each completed refill was audited for the above medication errors and a brief description of any errors found was noted. RESULTS: A total of 825 refilled items were audited prior to PARx installation (from dates 7/14/09-7/19/09) and a total of five errors were found. Post PARx installation, 959 items were audited (from dates 9/24/09-9/29/09) and a total of two errors were found. Overall, the types of errors encountered were Right Drug/Wrong Form (1/7, 14.3%), Filling Error/Wrong Pocket (2/7, 28.6%), Overfill (1/7, 14.3%), Expired Medication (2/7, 28.6%) and Right Drug/Wrong Strength (1/7, 14.3%). A Chi-square analysis was done to compare pre and post-PARx implementation errors found. The Chi square value was found to be 1.79 with a p-value of 0.18, meaning that there is an 18% probability that any deviation from expected is due to chance. Thus, per our investigation the installation of PARx did not significantly decrease refill error rates. CONCLUSIONS: In Progress

This study was concerned with determining the effects that varying the methadone-dispensing frequencies during mandatory clinic visits had on patients' retention in treatment and behavioral adjustment.

Master of Public Health - MPH / Background: The irrational use of medicines is a global public health challenge, particularly in developing countries like Nigeria. One of the consequences of irrational medicine use is rising antimicrobial resistance, which continues to contribute to the increase in morbidity, mortality, and high cost of care, despite breakthroughs in medicine and new treatment options. Community pharmacists have been identified as contributors to antimicrobial resistance through their antibiotic dispensing practices. However, there is little research on community pharmacists who provide private healthcare in Nigeria. Aim: This study described the antibiotic dispensing practices of community pharmacists and factors associated with such dispensing practices in Jos, Nigeria. Methodology: The study used a cross-sectional descriptive design. Simple random sampling was used to select a sample of 84 community pharmacies out of a total of approximately 107 community pharmacies in Jos, and one community pharmacist from each community pharmacy. A research assistant was trained to administer the questionnaire along with the researcher and collect information on community pharmacists’ demographics, antibiotic dispensing practices, and the factors associated with those dispensing practices. The socio-demographic data was analysed via descriptive analytical tools such as simple percentages and crosstabulations. These tools were used to generate a descriptive picture of the data, patterns and associations using SPSS version 25. Quantitative content analysis was done on responses to scenario-based questions, and recommendations made as to how the dispensing of antibiotics could be improved. Ethical clearance was obtained from the University of the Western Cape Biomedical Research Ethics Committee and Jos University Teaching Hospital, while informed consent was obtained from all community pharmacists before the commencement of the study. Results: The majority of the community pharmacists (87%) indicated that patients could purchase antibiotics without prescription from their pharmacies, and most pharmacists (98%) asked for reasons why antibiotics were demanded for without prescriptions. While 58% indicated that patients could purchase partial quantities of prescribed antibiotics at their pharmacies, 96% investigated the reasons for partial requests, and 94% counselled on the right dosage and frequency of the prescribed antibiotics. Sixty-seven percent of the pharmacists indicated that one of the major reasons for dispensing antibiotics without prescription was self-medication by patients, while most (87%) indicated that financial constraint was a major reason why patients requested for partial quantities of prescribed antibiotics. Conclusion: The dispensing of non-prescribed and part-prescribed antibiotics is a common practice amongst community pharmacists in Jos, Nigeria. Enhancing the financial status of Nigerians, as well as ensuring stricter regulatory measures on antibiotic use, would help promote rational use of antibiotics and reduce rising antimicrobial resistance rates.

No description available.

<p>This thesis for the Master of Science degree was performed at Oppunda Electronics AB. The assignment was to further develop an existing prototype of a dispensing equipment. The dispensing equipment doses a kind of glue, bonding which dentist use to mend teeth. The dispensing equipment is adjusted to dose 12 micro litres of bonding. With the dispensing equipment SafeBond Electronic the user can reduce the bonding consumption with approximately 50 percent. Furthermore will the handling of the bonding be more hygienic, because the photoelectric sensor allows the user to start a dosage without touching any part of the dispensing equipment. </p><p>The main requirements for the development was to reduce the size of the existing prototype and implement functions to makeit possible to change the dose time and display the current dose time. Some parts and components have been replaced and reorganized to reduce the size of the dispenser. The choice of a steep motor, which makes the rotation when a dosage is performed, is the largest contribution to shrink the size of the equipment. Also the new designed circuit board makes it possible to reduce the size of the dispensing equipment.</p><p>A LCD is used to show the current dose time. The LCD is a part of a LCD module. To change the dosing time two push buttons are being used. A microcontroller is controlling the steep motor. The microcontroller is a PIC16F877A from Microchip. The microcontroller in the dispensing equipment is controlling all the functions. The program code is designed to function in an interrupt routine. This makes it possible to set the processor in a sleep mode when the dispenser is not in use and decrease the power consumption. </p><p>More functions have been implemented in the dispenser and it is now more suitable for itsassignment. In the mean time it has been possible to reduce the size of the equipment. The chosen parts andcomponents make a good price function ratio. During the product development a lot of documentations have been done. Which make the dispensing equipment ready to be implemented in production.</p>