Medical Prosthetics for Plastic Surgery-Adherent Interface System Mid-Semester Paper October 24, 2007 Team Members: Matt Kudek, Lindsey Carlson, Nicole Daehn, Paul Schildgen, Christopher Walker Client: Gregory G. Gion, Medical Art Prosthetics, LLC Advisor: Professor Willis Tompkins, Ph.D.2 Table of Contents: Abstract……………………………………………………………………………………3 Problem Statement………………………………………………………………………...3 Client Motivation……………………………………………………………………….....4 Background Information….……………………………………………………………….5 Design Requirements……………………………………………………………………...5 Preliminary Design Ideas………………………………………………………………….6 Design 1: Clip Pack…………..…………………………………………………………...6 Design 2: One-Tube Syringe……………………………………………………………...8 Design 3: Double-Syringe…………….………………………………………………….9 Design Matrix……………………………………………………………………………11 Future work……………………………………………………………………………....12 References……………..……………..……………..……………..……………..………14 Appendix One – Product Design Specification...……………….……………………….153 Abstract: Gregory Gion is the owner of Medical Art Prosthetics, LLC and has specialized in custom-made facial and somato prosthetics since 1985. His goal is to incorporate more adhesive options for patient use. The purpose of this project is to design a dispensing method for two-component platinum-cured adhesives using lightweight and compact equipment for easier use. Three design alternatives have been considered: a clip pack, a one-tube syringe, and a double-tube syringe. Each design was evaluated using a design matrix, comparing design criteria given by the client. The best designs, the clip-pack and double-syringe, were selected and prototypes of these are being developed. Future work includes ordering necessary supplies to construct dispensing methods as well as developing a protective barrier between the adhesive and prosthesis. Problem Statement: Our client, Greg Gion, has many problems with the types of prosthetic adhesives he has available to him. One of the primary problems Greg deals with is the fact that although two component adhesives are of a higher quality, Greg typically distributes one- component adhesives to his clients because the current dispensing method is difficult and tedious. The purpose of our project is to create an efficient method to effectively mix and dispense a platinum-cured, two-component adhesive for prosthetic use. Platinum curing involves a silicone curing system, which utilizes a platinum catalyst to start the reaction (Cosmesil & Esefex 2005).4 Client Motivation: Currently in practice, Greg distributes a one-component adhesive that is water-based. While the adhesive dries clear, it has many disadvantages. One of the main problems is that the glue tends to set too quickly so placement of the prosthesis on the face needs to be exact during its first application and cannot be readjusted. Another problem with this adhesive is its tendency to damage the silicone of the prosthesis. Since these prostheses are made to look as realistic as possible, they are often constructed with many thin edges, which make them easily susceptible to tearing. A torn prosthesis does not look natural and is less likely to be worn, effectively making it useless. While Greg has some two-component adhesive options, dispensing methods are inadequate. The two-component systems that are platinum-cured require a mixing gun and static mixing tube. One of the current methods being used to mix and dispense prosthetic adhesive is a side-by-side double syringe cartridge connected to a dispensing gun with a static mixing nozzle attached (Figure 1). However, this equipment is costly for an individual to purchase for use at home. Second, this method produces a lot of waste because any adhesive remaining in the static mixing tube hardens in the tube and is unusable at a later time. This system also prevents public use because it is too bulky to keep in a purse or pocket. Figure 1: Mixing Gun (http://www.intertronics.co.uk/products/xdisp.htm)5 Another option Greg currently has for a two-component system requires hand mixing. The two components are dispensed onto a piece of paper and mixed manually with a spatula. This method can be messy and produces waste when the adhesive cures to the paper. Another problem is that if an individual does not mix the components completely the adhesive will not be able to properly cure and may run during an application. Background: Our client, Greg Gion has owned Medical Art Prosthetics for over twenty years. Allison Long has recently joined him in his practice in his Madison and Dallas facilities. Greg and Allison are both anoplastologists, individuals who custom design facial and somato prostheses. They both work with medical and dental specialists in order to create realistic and comfortable prostheses for their patients. These prostheses can be made out of silicone or polyurethane, while layers of paint and silicone are used to create the life-like look of the prosthesis. Design Requirements: Our product design must be lightweight and compact, allowing patients to take their adhesives in a purse or pocket. This will enable them to readjust their prostheses in the event it comes loose while in public. It is important for our dispenser to effectively mix the components to ensure that the adhesive cures properly and does not run after application. The design should minimize waste and cost. In addition, the dispensing of the adherent system will be easy and precise. Finally, the dispenser will accurately6 dispense proper proportions of each component to ensure the reaction goes to completion. Refer to Appendix 1 for complete design specifications. Preliminary Design Ideas: Design 1: Clip Pack The first proposed design for the adhesive dispenser
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