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Alternative design 1




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Alternative Design # 1 report Adjustable Back Angle Controller (ABAC) By Alaena DeStefano Steven Frisk Raymond Pennoyer Team No. 8 Funded by: Rehabilitation Education Research Center Client Contact Information Dr. John Enderle University of Connecticut: Biomedical Engineering Department Program Director & Professor of Biomedical Engineering Bronwell Building, Room 217C 260 Glendale Road, Storrs, Connecticut 06269-2247 Voice: (860) 486-2500 Email: [email protected] Website: www.eng2.uconn.edu/~jenderle BME Program Homepage: www.bme.uconn.edu EMB Magazine Homepage: www.EMB-Magazine.bme.uconn.edu 1 Table of Contents Page 1. Alternative Design Project No. 1 2 1.1. Introduction 2 1.2. Subunits 3-13 Control Lever 3 Lever 3-4 Hydraulic Control Valves 4-5 Resistance Springs 5-6 Hydraulic Pump 7-8 Motor 8-9 Hydraulic Tubing and Fixtures 9-10 Pressure Valves 10 Pressure Gauge and Adapter 11 Hydraulic Lift 11-12 Polycarbonate Box 13 2. Realistic Constraints 14-15 3. Safety Issues 16-17 4. Impact of Engineering Solutions 17-19 5. Life-Long Learning 19-20 6. References 20-21 Figures and Tables Figure 1 Basic Design of Handle 4 Figure 2 Operation of a Control Valve 5 Figure 3 Calculation of Input Force on Springs 6 Figure 4 Free Body Diagrams 6 Figure 5 PROCON Series 4 Pump 8 Figure 6 48YZ Frame Motor 9 Figure 7 Hydraulic Fixtures and Hosing 10 Figure 8 Pressure Valve Regulator 10 Figure 9 Pressure Gauge and Adapter 11 Figure 10 Prince Double Acting Hydraulic Cylinder 12 Figure 11 View of the Intermediate Trunnion Mounting Style 12 Figure 12 Clear Polycarbonate Sheets ¼” thick 13 Figure 13 Overall Schematic of Design 13 Table 1 Bore Size vs. Weight Lifted 11 Table 2 Proposed Budget 19 2 1. Alternative Design Project No.1 1.1. Introduction Nursing is among one of the highest risk occupations for the development of back pain and injuries. Currently 17% of nurses experience chronic back pain due to working in a hospital setting. 36% of these back injuries in nurses can be contributed to patient handling. In addition to the back pain, women are also twice as likely to contract musculoskeletal disorders from the following work tasks: lifting greater than 6.5lbs, lifting patients more than 10 times per hour, making beds normally or often, and pushing beds/trolleys more than 10 minutes per day [1]. These daily tasks cannot be avoided; however, by the implementation of an automatic adjustable bed, nurses will incur less stress on their back during the adjustment of the patient. Patients suffering from back pain, obesity, and other debilitating diseases, require an inclined bed back to relieve pain or provide easy access to the bed. Current technology includes an adjustable bed back with a remote control that is accessible for both the patient and the caretaker. However, this does not accommodate users of all disabilities. For example, a patient with limited sight may find it difficult to find the remote or press the correct buttons to operate the bed. Some of the current beds that may operate at higher speeds are rough or jerky when stopped in position. This erratic movement also occurs in beds that have more than one speed. The ...





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