Robert Linton STANDLEY;Kyle THOMPSON;Holly MCCLUNG;Lawrence M Candell;Reed Wasson HOYT;Gary A Shaw;Joseph M. MAHAN;Andrew M Siegel
发明人:
Holly MCCLUNG,Reed Wasson HOYT,Lawrence M Candell,Joseph M. MAHAN,Gary A Shaw,Andrew M Siegel,Robert Linton STANDLEY,Kyle THOMPSON
申请号：
US16414003
公开号：
US20200022618A1
申请日:
2019.05.16
申请国别(地区):
US
年份:
2020
代理人:
摘要：
A conventional flow tube for a metabolic cart is usually a straight length of pipe whose inner diameter is fixed by the respiratory burden imposed by the flow tube on the user, with a smaller diameter imposing a higher respiratory burden. The ratio of the straight flow tube's length to diameter is fixed by fluid dynamics, so increasing the flow tube's diameter causes the flow tube's length to increase. As the flow tube gets longer, it exerts more torque on the user's neck and jaw, creating discomfort. Reducing the flow tube's length causes an undesired increase in the respiratory burden but increasing the flow tube's diameter to reduce the respiratory burden makes the flow tube less comfortable, making the flow tube unconformable, hard to breathe through, or both. Bending the flow tube, e.g., in an L shape, makes it possible to increase the flow tube's propagation length without increasing the flow tube's lever arm length.
