| http://www.w3.org/ns/prov#value | - This valve guard can be formed of a variety of materials, such as a hard plastic, and serves to avoid inadvertent puncturing of the balloon by the sharp needle upon installation and deployment of the device. [0088] Another method of forming the device with an integral valve is depicted in FIGS. 18A-18C. In this method complimentary sheets of balloon material, such as urethane, are aligned and heat
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