Non-invasive method for semiquantitative measurement of neck volume changes
US4456015A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1982 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1073
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method of semiquantitatively measuring a subject's neck volume includes the steps of providing an extensible conductor in the form of a loop having a predetermined height; providing a signal variably responsive in value to changes in the inductance of the conductor; calibrating the signal by determining reference signal values obtained with the conductor disposed about at least two known volumes and using the reference signal values to establish the relationship between signal value and the volume enclosed by the conductor; disposing the conductor in close encircling relationship about the subject's neck; calibrating the signal for intrapleural pressure by using an invasive technique as a reference for determining a plurality of intrapleural pressures for the subject and simultaneously determining the signal value for each such intrapleural pressure measurment, thereby establishing the relationship between intrapleural pressure and signal value; discontinuing the reference technique; determining the signal value with the subject's airway closed, correlating the closed airway signal value with intrapleural pressure based on the established relationship between intrapleural pressur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.