Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2007. / Includes bibliographical references (leaves 82-85). Also available in electronic version.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Colton, Jonathan; Committee Member: Ku, David; Committee Member: Prausnitz, Mark. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (M.S.)--University of Michigan, 1958.

Thesis (M.S.)--University of Michigan, 1958.

No description available.

Background Adolescents and adults suffering from needle phobia have an unreasonable fear of needles that leads to negative experiences if they do not get the support they need. Negative experiences lead to patients avoiding health care, or these experiences affect important aspects of life. The suffering that a patient experiences may be obvious to some, but others hide it, and then it will be more difficult to detect. The nurse's role is to recognize the suffering and its different reactions in order to alleviate and prevent unnecessary suffering of the patient. AimThe purpose of this study was to describe about young people's and adults' experiences of having needle phobias. Method A literature review methodology, using eight quantitative articles and one qualitative article relevant for the aim of study.The analysis was done by comparing the similarities and differences from the result's content.Afterwards the most important parts in the result was coded to build categories and themes. Results Patients with needle phobias experience many different physical reactions such aspain, vasovagal reaction and other reactions during venipuncture, injections or just by seeing a needle. Long waiting times worsened the experience and strengthened the response. Patients experience more anxiety and fear because of their previous negative experiences and because of the medical environment. Experiences and reactions differ between ages, gender and level of education. Conclusion Patients with needle phobias have different experiences and reactions vary from person to person. Nurses on care institutions need more knowledge about patient'sexperiencesof needle phobias to better support and ease the suffering that afflicts the patients.

No description available.

This thesis explores the analysis and fabrication of plastic hypodermic needles. The hypotheses for this work are that replacing metal hypodermic needles with plastic ones will reduce or eliminate the possibility of the second-hand infections from needle sticks and unsterlized reuse and will be more cost and time efficient to recycle. The most critical structural failure mode for plastic needles is buckling due to their shape (thin walled hollow column). The consideration of buckling is critical to avoid structural failure and to ensure reliability for medical applications. The buckling strength of a cannula is analyzed by analytic (Euler buckling theory) and finite element analysis (FEA) methods. A 22 gage needle model (OD 0.7mm, ID 0.4mm, Length 12.7mm) was analyzed. Euler buckling theory was used to calculate the critical buckling load. Numerical approaches using finite element analyses showed very similar results with analytic results. A skin model was introduced to simulate boundary conditions in the numerical approaches. To verify the results of the analyses, cannulas with the same cross-sectional dimensions were fabricated using a micro injection molding technique. To make the parts hollow, a core assembly of straightened wire was used. Using the tip of a 22 gage needle, cannulas with the inverse shape of an actual hypodermic needle were made. The structural (buckling) characteristics of cannulas were measured by a force-displacement testing machine. When buckling occurred, an arch shape was visible and there was an abrupt change in the load plot. Test results showed the relation between the needles length and the buckling load, which was similar to that predicted by Euler buckling theory. However, test values were 60% of the theoretical or analytical results. Several reasons to explain these discrepancies can be found. The first is that an unexpected bending moment resulted from an eccentric loading due to installation off-center to the center of the testing machine or to the oblique insertion. A cannula that was initially bent during ejection from the mold can add an unexpected bending moment. The quality control of cannulas can be another reason. Bent or misaligned core wires produce eccentric cannulas, and the thinner wall section can buckle or initiate fracture more easily. The last reason may be that Euler buckling theory is not fully valid in short cannula, because the axial stress reaches yield stress before buckling occurs. Inelastic deformation occurs (i.e., the modulus is reduced) during compression in short cannula. The Johnson column formula is introduced to explain this situation. Especially for the nylon nanocomposite material tested, a loss in modulus due to moisture absorption may be another explanation for the discrepancies.

No description available.

Thesis (M.S. in M.E.)--School of Mechanical Engineering, Georgia Institute of Technology, 2004. Directed by Jonathan S. Colton. / Includes bibliographical references (leaves 86-88).