|국가/구분||United States(US) Patent 등록|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 2 인용 특허 : 97|
A device comprises a spring and a sleeve. The spring is configured to form a closed loop. The spring is moveable between a coiled configuration when the spring is collapsed and an uncoiled configuration when the spring is expanded. The spring defines a circumference while in the uncoiled configuration. The spring is disposed within the sleeve.
1. An apparatus, comprising: a spring being moveable between a coiled configuration when the spring is collapsed and an uncoiled configuration when the spring is expanded, the spring defining a closed loop when in the uncoiled configuration;a first membrane disposed within at least a portion of the closed loop of the spring, the first membrane formed with a first material;a second membrane coupled to the first membrane and disposed at least partially within the closed loop of the spring, the second membrane being formed with a second material different t...