A study on the interface pressure generated by custom-made pressure garment constructon methods

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A study on the interface pressure generated by custom-made pressure garment constructon methods


Author: The, Yan Vivian
Title: A study on the interface pressure generated by custom-made pressure garment constructon methods
Degree: M.Sc.
Year: 2000
Subject: Pressure suits -- Therapeutic use
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Jockey Club Rehabilitation Engineering Centre
Pages: vii, 115 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1532104
URI: http://theses.lib.polyu.edu.hk/handle/200/4596
Abstract: Pressure therapy has been used in the treatment of hypertrophic scars, lymphoedema, varicose vein and deep vein thrombosis for more than two decades. Many studies reported the beneficial effects of such treatment. However, there seems to be little attention being spent on objectively documenting the actual amount of interfacial pressure applied, which makes these published reports of limited value. In Hong Kong, custom-made pressure garment is commonly used as a conservative treatment by the therapist. The procedure for making made-to-fit pressure garments in clinical situations has been following a circumferential measurement reduction method which simply takes 10-15% reduction off the measured circumferential dimension of the body part to generate the required tension. The mechanical property of garment materials and the construction techniques can greatly influence the actual pressure generated at the body-garment interface, and the above method have not taken these into account. The Laplace Law is one of the main principles used in pressure garment calculation. It indicates that the pressure is directly affected by the tension applied and is inversely proportional to the radius of curvature of body parts. Nevertheless, the Laplace Law does not take into account of the material property of fabrics, which has shown significant influence on the interface pressure produced by the garment. With the advancement of interface pressure measurement technology, it is now feasible to measure tissue-garment interface pressure with reasonable accuracy. The newly introduced "Flexiforce" sensor (Tekscan, USA) was used for interface pressure measurement in this study. In this project, we evaluated and documented the mechanical properties of two Lycra materials that are commonly used for pressure garment fabrication. A comparison on tissure-garment interface pressure generated was conducted with different garment construction methods. These include the traditional circumferential reduction method, circumferential calculation method which incorporated the garment material properties, and finally a newly proposed formula for calculating the required circumferential dimension that included both garment material properties and the tissue properties. Repeated measure ANOVA and paired-T test was used to analyze the result. The results indicate that the equation involving both garment material and tissue property of subjects produces more accuracy in interfacial pressure prediction. Different materials were found to have different tensile strengths and tension decay properties that significant contributed towards the tension to be produced.

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